1cdedef59SAnirudh Venkataramanan // SPDX-License-Identifier: GPL-2.0
2cdedef59SAnirudh Venkataramanan /* Copyright (c) 2018, Intel Corporation. */
3cdedef59SAnirudh Venkataramanan
4cdedef59SAnirudh Venkataramanan /* The driver transmit and receive code */
5cdedef59SAnirudh Venkataramanan
6cdedef59SAnirudh Venkataramanan #include <linux/mm.h>
7cc14db11SJesse Brandeburg #include <linux/netdevice.h>
8cc14db11SJesse Brandeburg #include <linux/prefetch.h>
9efc2214bSMaciej Fijalkowski #include <linux/bpf_trace.h>
102a87bd73SDave Ertman #include <net/dsfield.h>
1169e66c04SJoe Damato #include <net/mpls.h>
12efc2214bSMaciej Fijalkowski #include <net/xdp.h>
130891d6d4SKrzysztof Kazimierczak #include "ice_txrx_lib.h"
14efc2214bSMaciej Fijalkowski #include "ice_lib.h"
15cdedef59SAnirudh Venkataramanan #include "ice.h"
163089cf6dSJesse Brandeburg #include "ice_trace.h"
175f6aa50eSAnirudh Venkataramanan #include "ice_dcb_lib.h"
182d4238f5SKrzysztof Kazimierczak #include "ice_xsk.h"
19f5396b8aSGrzegorz Nitka #include "ice_eswitch.h"
20cdedef59SAnirudh Venkataramanan
212b245cb2SAnirudh Venkataramanan #define ICE_RX_HDR_SIZE 256
222b245cb2SAnirudh Venkataramanan
23148beb61SHenry Tieman #define FDIR_DESC_RXDID 0x40
24cac2a27cSHenry Tieman #define ICE_FDIR_CLEAN_DELAY 10
25cac2a27cSHenry Tieman
26cac2a27cSHenry Tieman /**
27cac2a27cSHenry Tieman * ice_prgm_fdir_fltr - Program a Flow Director filter
28cac2a27cSHenry Tieman * @vsi: VSI to send dummy packet
29cac2a27cSHenry Tieman * @fdir_desc: flow director descriptor
30cac2a27cSHenry Tieman * @raw_packet: allocated buffer for flow director
31cac2a27cSHenry Tieman */
32cac2a27cSHenry Tieman int
ice_prgm_fdir_fltr(struct ice_vsi * vsi,struct ice_fltr_desc * fdir_desc,u8 * raw_packet)33cac2a27cSHenry Tieman ice_prgm_fdir_fltr(struct ice_vsi *vsi, struct ice_fltr_desc *fdir_desc,
34cac2a27cSHenry Tieman u8 *raw_packet)
35cac2a27cSHenry Tieman {
36cac2a27cSHenry Tieman struct ice_tx_buf *tx_buf, *first;
37cac2a27cSHenry Tieman struct ice_fltr_desc *f_desc;
38cac2a27cSHenry Tieman struct ice_tx_desc *tx_desc;
39e72bba21SMaciej Fijalkowski struct ice_tx_ring *tx_ring;
40cac2a27cSHenry Tieman struct device *dev;
41cac2a27cSHenry Tieman dma_addr_t dma;
42cac2a27cSHenry Tieman u32 td_cmd;
43cac2a27cSHenry Tieman u16 i;
44cac2a27cSHenry Tieman
45cac2a27cSHenry Tieman /* VSI and Tx ring */
46cac2a27cSHenry Tieman if (!vsi)
47cac2a27cSHenry Tieman return -ENOENT;
48cac2a27cSHenry Tieman tx_ring = vsi->tx_rings[0];
49cac2a27cSHenry Tieman if (!tx_ring || !tx_ring->desc)
50cac2a27cSHenry Tieman return -ENOENT;
51cac2a27cSHenry Tieman dev = tx_ring->dev;
52cac2a27cSHenry Tieman
53cac2a27cSHenry Tieman /* we are using two descriptors to add/del a filter and we can wait */
54cac2a27cSHenry Tieman for (i = ICE_FDIR_CLEAN_DELAY; ICE_DESC_UNUSED(tx_ring) < 2; i--) {
55cac2a27cSHenry Tieman if (!i)
56cac2a27cSHenry Tieman return -EAGAIN;
57cac2a27cSHenry Tieman msleep_interruptible(1);
58cac2a27cSHenry Tieman }
59cac2a27cSHenry Tieman
60cac2a27cSHenry Tieman dma = dma_map_single(dev, raw_packet, ICE_FDIR_MAX_RAW_PKT_SIZE,
61cac2a27cSHenry Tieman DMA_TO_DEVICE);
62cac2a27cSHenry Tieman
63cac2a27cSHenry Tieman if (dma_mapping_error(dev, dma))
64cac2a27cSHenry Tieman return -EINVAL;
65cac2a27cSHenry Tieman
66cac2a27cSHenry Tieman /* grab the next descriptor */
67cac2a27cSHenry Tieman i = tx_ring->next_to_use;
68cac2a27cSHenry Tieman first = &tx_ring->tx_buf[i];
69cac2a27cSHenry Tieman f_desc = ICE_TX_FDIRDESC(tx_ring, i);
70cac2a27cSHenry Tieman memcpy(f_desc, fdir_desc, sizeof(*f_desc));
71cac2a27cSHenry Tieman
72cac2a27cSHenry Tieman i++;
73cac2a27cSHenry Tieman i = (i < tx_ring->count) ? i : 0;
74cac2a27cSHenry Tieman tx_desc = ICE_TX_DESC(tx_ring, i);
75cac2a27cSHenry Tieman tx_buf = &tx_ring->tx_buf[i];
76cac2a27cSHenry Tieman
77cac2a27cSHenry Tieman i++;
78cac2a27cSHenry Tieman tx_ring->next_to_use = (i < tx_ring->count) ? i : 0;
79cac2a27cSHenry Tieman
80cac2a27cSHenry Tieman memset(tx_buf, 0, sizeof(*tx_buf));
81cac2a27cSHenry Tieman dma_unmap_len_set(tx_buf, len, ICE_FDIR_MAX_RAW_PKT_SIZE);
82cac2a27cSHenry Tieman dma_unmap_addr_set(tx_buf, dma, dma);
83cac2a27cSHenry Tieman
84cac2a27cSHenry Tieman tx_desc->buf_addr = cpu_to_le64(dma);
85cac2a27cSHenry Tieman td_cmd = ICE_TXD_LAST_DESC_CMD | ICE_TX_DESC_CMD_DUMMY |
86cac2a27cSHenry Tieman ICE_TX_DESC_CMD_RE;
87cac2a27cSHenry Tieman
88aa1d3fafSAlexander Lobakin tx_buf->type = ICE_TX_BUF_DUMMY;
89cac2a27cSHenry Tieman tx_buf->raw_buf = raw_packet;
90cac2a27cSHenry Tieman
91cac2a27cSHenry Tieman tx_desc->cmd_type_offset_bsz =
92cac2a27cSHenry Tieman ice_build_ctob(td_cmd, 0, ICE_FDIR_MAX_RAW_PKT_SIZE, 0);
93cac2a27cSHenry Tieman
94cac2a27cSHenry Tieman /* Force memory write to complete before letting h/w know
95cac2a27cSHenry Tieman * there are new descriptors to fetch.
96cac2a27cSHenry Tieman */
97cac2a27cSHenry Tieman wmb();
98cac2a27cSHenry Tieman
99cac2a27cSHenry Tieman /* mark the data descriptor to be watched */
100cac2a27cSHenry Tieman first->next_to_watch = tx_desc;
101cac2a27cSHenry Tieman
102cac2a27cSHenry Tieman writel(tx_ring->next_to_use, tx_ring->tail);
103cac2a27cSHenry Tieman
104cac2a27cSHenry Tieman return 0;
105cac2a27cSHenry Tieman }
106148beb61SHenry Tieman
107cdedef59SAnirudh Venkataramanan /**
108cdedef59SAnirudh Venkataramanan * ice_unmap_and_free_tx_buf - Release a Tx buffer
109cdedef59SAnirudh Venkataramanan * @ring: the ring that owns the buffer
110cdedef59SAnirudh Venkataramanan * @tx_buf: the buffer to free
111cdedef59SAnirudh Venkataramanan */
112cdedef59SAnirudh Venkataramanan static void
ice_unmap_and_free_tx_buf(struct ice_tx_ring * ring,struct ice_tx_buf * tx_buf)113e72bba21SMaciej Fijalkowski ice_unmap_and_free_tx_buf(struct ice_tx_ring *ring, struct ice_tx_buf *tx_buf)
114cdedef59SAnirudh Venkataramanan {
115cdedef59SAnirudh Venkataramanan if (dma_unmap_len(tx_buf, len))
116cdedef59SAnirudh Venkataramanan dma_unmap_page(ring->dev,
117cdedef59SAnirudh Venkataramanan dma_unmap_addr(tx_buf, dma),
118cdedef59SAnirudh Venkataramanan dma_unmap_len(tx_buf, len),
119cdedef59SAnirudh Venkataramanan DMA_TO_DEVICE);
120aa1d3fafSAlexander Lobakin
121aa1d3fafSAlexander Lobakin switch (tx_buf->type) {
122aa1d3fafSAlexander Lobakin case ICE_TX_BUF_DUMMY:
123aa1d3fafSAlexander Lobakin devm_kfree(ring->dev, tx_buf->raw_buf);
124aa1d3fafSAlexander Lobakin break;
125aa1d3fafSAlexander Lobakin case ICE_TX_BUF_SKB:
126aa1d3fafSAlexander Lobakin dev_kfree_skb_any(tx_buf->skb);
127aa1d3fafSAlexander Lobakin break;
128aa1d3fafSAlexander Lobakin case ICE_TX_BUF_XDP_TX:
129aa1d3fafSAlexander Lobakin page_frag_free(tx_buf->raw_buf);
130aa1d3fafSAlexander Lobakin break;
131055d0920SAlexander Lobakin case ICE_TX_BUF_XDP_XMIT:
132055d0920SAlexander Lobakin xdp_return_frame(tx_buf->xdpf);
133055d0920SAlexander Lobakin break;
134cdedef59SAnirudh Venkataramanan }
135cdedef59SAnirudh Venkataramanan
136cdedef59SAnirudh Venkataramanan tx_buf->next_to_watch = NULL;
137aa1d3fafSAlexander Lobakin tx_buf->type = ICE_TX_BUF_EMPTY;
138cdedef59SAnirudh Venkataramanan dma_unmap_len_set(tx_buf, len, 0);
139cdedef59SAnirudh Venkataramanan /* tx_buf must be completely set up in the transmit path */
140cdedef59SAnirudh Venkataramanan }
141cdedef59SAnirudh Venkataramanan
txring_txq(const struct ice_tx_ring * ring)142e72bba21SMaciej Fijalkowski static struct netdev_queue *txring_txq(const struct ice_tx_ring *ring)
143cdedef59SAnirudh Venkataramanan {
144cdedef59SAnirudh Venkataramanan return netdev_get_tx_queue(ring->netdev, ring->q_index);
145cdedef59SAnirudh Venkataramanan }
146cdedef59SAnirudh Venkataramanan
147cdedef59SAnirudh Venkataramanan /**
148cdedef59SAnirudh Venkataramanan * ice_clean_tx_ring - Free any empty Tx buffers
149cdedef59SAnirudh Venkataramanan * @tx_ring: ring to be cleaned
150cdedef59SAnirudh Venkataramanan */
ice_clean_tx_ring(struct ice_tx_ring * tx_ring)151e72bba21SMaciej Fijalkowski void ice_clean_tx_ring(struct ice_tx_ring *tx_ring)
152cdedef59SAnirudh Venkataramanan {
153e72bba21SMaciej Fijalkowski u32 size;
154cdedef59SAnirudh Venkataramanan u16 i;
155cdedef59SAnirudh Venkataramanan
1561742b3d5SMagnus Karlsson if (ice_ring_is_xdp(tx_ring) && tx_ring->xsk_pool) {
1572d4238f5SKrzysztof Kazimierczak ice_xsk_clean_xdp_ring(tx_ring);
1582d4238f5SKrzysztof Kazimierczak goto tx_skip_free;
1592d4238f5SKrzysztof Kazimierczak }
1602d4238f5SKrzysztof Kazimierczak
161cdedef59SAnirudh Venkataramanan /* ring already cleared, nothing to do */
162cdedef59SAnirudh Venkataramanan if (!tx_ring->tx_buf)
163cdedef59SAnirudh Venkataramanan return;
164cdedef59SAnirudh Venkataramanan
1652f2da36eSAnirudh Venkataramanan /* Free all the Tx ring sk_buffs */
166cdedef59SAnirudh Venkataramanan for (i = 0; i < tx_ring->count; i++)
167cdedef59SAnirudh Venkataramanan ice_unmap_and_free_tx_buf(tx_ring, &tx_ring->tx_buf[i]);
168cdedef59SAnirudh Venkataramanan
1692d4238f5SKrzysztof Kazimierczak tx_skip_free:
170c6dfd690SBruce Allan memset(tx_ring->tx_buf, 0, sizeof(*tx_ring->tx_buf) * tx_ring->count);
171cdedef59SAnirudh Venkataramanan
172e72bba21SMaciej Fijalkowski size = ALIGN(tx_ring->count * sizeof(struct ice_tx_desc),
173e72bba21SMaciej Fijalkowski PAGE_SIZE);
174cdedef59SAnirudh Venkataramanan /* Zero out the descriptor ring */
175e72bba21SMaciej Fijalkowski memset(tx_ring->desc, 0, size);
176cdedef59SAnirudh Venkataramanan
177cdedef59SAnirudh Venkataramanan tx_ring->next_to_use = 0;
178cdedef59SAnirudh Venkataramanan tx_ring->next_to_clean = 0;
179cdedef59SAnirudh Venkataramanan
180cdedef59SAnirudh Venkataramanan if (!tx_ring->netdev)
181cdedef59SAnirudh Venkataramanan return;
182cdedef59SAnirudh Venkataramanan
183cdedef59SAnirudh Venkataramanan /* cleanup Tx queue statistics */
184cdedef59SAnirudh Venkataramanan netdev_tx_reset_queue(txring_txq(tx_ring));
185cdedef59SAnirudh Venkataramanan }
186cdedef59SAnirudh Venkataramanan
187cdedef59SAnirudh Venkataramanan /**
188cdedef59SAnirudh Venkataramanan * ice_free_tx_ring - Free Tx resources per queue
189cdedef59SAnirudh Venkataramanan * @tx_ring: Tx descriptor ring for a specific queue
190cdedef59SAnirudh Venkataramanan *
191cdedef59SAnirudh Venkataramanan * Free all transmit software resources
192cdedef59SAnirudh Venkataramanan */
ice_free_tx_ring(struct ice_tx_ring * tx_ring)193e72bba21SMaciej Fijalkowski void ice_free_tx_ring(struct ice_tx_ring *tx_ring)
194cdedef59SAnirudh Venkataramanan {
195e72bba21SMaciej Fijalkowski u32 size;
196e72bba21SMaciej Fijalkowski
197cdedef59SAnirudh Venkataramanan ice_clean_tx_ring(tx_ring);
198cdedef59SAnirudh Venkataramanan devm_kfree(tx_ring->dev, tx_ring->tx_buf);
199cdedef59SAnirudh Venkataramanan tx_ring->tx_buf = NULL;
200cdedef59SAnirudh Venkataramanan
201cdedef59SAnirudh Venkataramanan if (tx_ring->desc) {
202e72bba21SMaciej Fijalkowski size = ALIGN(tx_ring->count * sizeof(struct ice_tx_desc),
203e72bba21SMaciej Fijalkowski PAGE_SIZE);
204e72bba21SMaciej Fijalkowski dmam_free_coherent(tx_ring->dev, size,
205cdedef59SAnirudh Venkataramanan tx_ring->desc, tx_ring->dma);
206cdedef59SAnirudh Venkataramanan tx_ring->desc = NULL;
207cdedef59SAnirudh Venkataramanan }
208cdedef59SAnirudh Venkataramanan }
209cdedef59SAnirudh Venkataramanan
210cdedef59SAnirudh Venkataramanan /**
2112b245cb2SAnirudh Venkataramanan * ice_clean_tx_irq - Reclaim resources after transmit completes
2122b245cb2SAnirudh Venkataramanan * @tx_ring: Tx ring to clean
2132b245cb2SAnirudh Venkataramanan * @napi_budget: Used to determine if we are in netpoll
2142b245cb2SAnirudh Venkataramanan *
2152b245cb2SAnirudh Venkataramanan * Returns true if there's any budget left (e.g. the clean is finished)
2162b245cb2SAnirudh Venkataramanan */
ice_clean_tx_irq(struct ice_tx_ring * tx_ring,int napi_budget)217e72bba21SMaciej Fijalkowski static bool ice_clean_tx_irq(struct ice_tx_ring *tx_ring, int napi_budget)
2182b245cb2SAnirudh Venkataramanan {
2192b245cb2SAnirudh Venkataramanan unsigned int total_bytes = 0, total_pkts = 0;
2202fb0821fSJesse Brandeburg unsigned int budget = ICE_DFLT_IRQ_WORK;
2212fb0821fSJesse Brandeburg struct ice_vsi *vsi = tx_ring->vsi;
2222b245cb2SAnirudh Venkataramanan s16 i = tx_ring->next_to_clean;
2232b245cb2SAnirudh Venkataramanan struct ice_tx_desc *tx_desc;
2242b245cb2SAnirudh Venkataramanan struct ice_tx_buf *tx_buf;
2252b245cb2SAnirudh Venkataramanan
226cc14db11SJesse Brandeburg /* get the bql data ready */
227cc14db11SJesse Brandeburg netdev_txq_bql_complete_prefetchw(txring_txq(tx_ring));
228cc14db11SJesse Brandeburg
2292b245cb2SAnirudh Venkataramanan tx_buf = &tx_ring->tx_buf[i];
2302b245cb2SAnirudh Venkataramanan tx_desc = ICE_TX_DESC(tx_ring, i);
2312b245cb2SAnirudh Venkataramanan i -= tx_ring->count;
2322b245cb2SAnirudh Venkataramanan
2332fb0821fSJesse Brandeburg prefetch(&vsi->state);
2342fb0821fSJesse Brandeburg
2352b245cb2SAnirudh Venkataramanan do {
2362b245cb2SAnirudh Venkataramanan struct ice_tx_desc *eop_desc = tx_buf->next_to_watch;
2372b245cb2SAnirudh Venkataramanan
2382b245cb2SAnirudh Venkataramanan /* if next_to_watch is not set then there is no work pending */
2392b245cb2SAnirudh Venkataramanan if (!eop_desc)
2402b245cb2SAnirudh Venkataramanan break;
2412b245cb2SAnirudh Venkataramanan
242cc14db11SJesse Brandeburg /* follow the guidelines of other drivers */
243cc14db11SJesse Brandeburg prefetchw(&tx_buf->skb->users);
244cc14db11SJesse Brandeburg
2452b245cb2SAnirudh Venkataramanan smp_rmb(); /* prevent any other reads prior to eop_desc */
2462b245cb2SAnirudh Venkataramanan
2473089cf6dSJesse Brandeburg ice_trace(clean_tx_irq, tx_ring, tx_desc, tx_buf);
2482b245cb2SAnirudh Venkataramanan /* if the descriptor isn't done, no work yet to do */
2492b245cb2SAnirudh Venkataramanan if (!(eop_desc->cmd_type_offset_bsz &
2502b245cb2SAnirudh Venkataramanan cpu_to_le64(ICE_TX_DESC_DTYPE_DESC_DONE)))
2512b245cb2SAnirudh Venkataramanan break;
2522b245cb2SAnirudh Venkataramanan
2532b245cb2SAnirudh Venkataramanan /* clear next_to_watch to prevent false hangs */
2542b245cb2SAnirudh Venkataramanan tx_buf->next_to_watch = NULL;
2552b245cb2SAnirudh Venkataramanan
2562b245cb2SAnirudh Venkataramanan /* update the statistics for this packet */
2572b245cb2SAnirudh Venkataramanan total_bytes += tx_buf->bytecount;
2582b245cb2SAnirudh Venkataramanan total_pkts += tx_buf->gso_segs;
2592b245cb2SAnirudh Venkataramanan
2602b245cb2SAnirudh Venkataramanan /* free the skb */
2612b245cb2SAnirudh Venkataramanan napi_consume_skb(tx_buf->skb, napi_budget);
2622b245cb2SAnirudh Venkataramanan
2632b245cb2SAnirudh Venkataramanan /* unmap skb header data */
2642b245cb2SAnirudh Venkataramanan dma_unmap_single(tx_ring->dev,
2652b245cb2SAnirudh Venkataramanan dma_unmap_addr(tx_buf, dma),
2662b245cb2SAnirudh Venkataramanan dma_unmap_len(tx_buf, len),
2672b245cb2SAnirudh Venkataramanan DMA_TO_DEVICE);
2682b245cb2SAnirudh Venkataramanan
2692b245cb2SAnirudh Venkataramanan /* clear tx_buf data */
270aa1d3fafSAlexander Lobakin tx_buf->type = ICE_TX_BUF_EMPTY;
2712b245cb2SAnirudh Venkataramanan dma_unmap_len_set(tx_buf, len, 0);
2722b245cb2SAnirudh Venkataramanan
2732b245cb2SAnirudh Venkataramanan /* unmap remaining buffers */
2742b245cb2SAnirudh Venkataramanan while (tx_desc != eop_desc) {
2753089cf6dSJesse Brandeburg ice_trace(clean_tx_irq_unmap, tx_ring, tx_desc, tx_buf);
2762b245cb2SAnirudh Venkataramanan tx_buf++;
2772b245cb2SAnirudh Venkataramanan tx_desc++;
2782b245cb2SAnirudh Venkataramanan i++;
2792b245cb2SAnirudh Venkataramanan if (unlikely(!i)) {
2802b245cb2SAnirudh Venkataramanan i -= tx_ring->count;
2812b245cb2SAnirudh Venkataramanan tx_buf = tx_ring->tx_buf;
2822b245cb2SAnirudh Venkataramanan tx_desc = ICE_TX_DESC(tx_ring, 0);
2832b245cb2SAnirudh Venkataramanan }
2842b245cb2SAnirudh Venkataramanan
2852b245cb2SAnirudh Venkataramanan /* unmap any remaining paged data */
2862b245cb2SAnirudh Venkataramanan if (dma_unmap_len(tx_buf, len)) {
2872b245cb2SAnirudh Venkataramanan dma_unmap_page(tx_ring->dev,
2882b245cb2SAnirudh Venkataramanan dma_unmap_addr(tx_buf, dma),
2892b245cb2SAnirudh Venkataramanan dma_unmap_len(tx_buf, len),
2902b245cb2SAnirudh Venkataramanan DMA_TO_DEVICE);
2912b245cb2SAnirudh Venkataramanan dma_unmap_len_set(tx_buf, len, 0);
2922b245cb2SAnirudh Venkataramanan }
2932b245cb2SAnirudh Venkataramanan }
2943089cf6dSJesse Brandeburg ice_trace(clean_tx_irq_unmap_eop, tx_ring, tx_desc, tx_buf);
2952b245cb2SAnirudh Venkataramanan
2962b245cb2SAnirudh Venkataramanan /* move us one more past the eop_desc for start of next pkt */
2972b245cb2SAnirudh Venkataramanan tx_buf++;
2982b245cb2SAnirudh Venkataramanan tx_desc++;
2992b245cb2SAnirudh Venkataramanan i++;
3002b245cb2SAnirudh Venkataramanan if (unlikely(!i)) {
3012b245cb2SAnirudh Venkataramanan i -= tx_ring->count;
3022b245cb2SAnirudh Venkataramanan tx_buf = tx_ring->tx_buf;
3032b245cb2SAnirudh Venkataramanan tx_desc = ICE_TX_DESC(tx_ring, 0);
3042b245cb2SAnirudh Venkataramanan }
3052b245cb2SAnirudh Venkataramanan
3062b245cb2SAnirudh Venkataramanan prefetch(tx_desc);
3072b245cb2SAnirudh Venkataramanan
3082b245cb2SAnirudh Venkataramanan /* update budget accounting */
3092b245cb2SAnirudh Venkataramanan budget--;
3102b245cb2SAnirudh Venkataramanan } while (likely(budget));
3112b245cb2SAnirudh Venkataramanan
3122b245cb2SAnirudh Venkataramanan i += tx_ring->count;
3132b245cb2SAnirudh Venkataramanan tx_ring->next_to_clean = i;
3142d4238f5SKrzysztof Kazimierczak
3152d4238f5SKrzysztof Kazimierczak ice_update_tx_ring_stats(tx_ring, total_pkts, total_bytes);
3161c96c168SJesse Brandeburg netdev_tx_completed_queue(txring_txq(tx_ring), total_pkts, total_bytes);
3172b245cb2SAnirudh Venkataramanan
3182b245cb2SAnirudh Venkataramanan #define TX_WAKE_THRESHOLD ((s16)(DESC_NEEDED * 2))
3192b245cb2SAnirudh Venkataramanan if (unlikely(total_pkts && netif_carrier_ok(tx_ring->netdev) &&
3202b245cb2SAnirudh Venkataramanan (ICE_DESC_UNUSED(tx_ring) >= TX_WAKE_THRESHOLD))) {
3212b245cb2SAnirudh Venkataramanan /* Make sure that anybody stopping the queue after this
3222b245cb2SAnirudh Venkataramanan * sees the new next_to_clean.
3232b245cb2SAnirudh Venkataramanan */
3242b245cb2SAnirudh Venkataramanan smp_mb();
3251c96c168SJesse Brandeburg if (netif_tx_queue_stopped(txring_txq(tx_ring)) &&
326e97fb1aeSAnirudh Venkataramanan !test_bit(ICE_VSI_DOWN, vsi->state)) {
3271c96c168SJesse Brandeburg netif_tx_wake_queue(txring_txq(tx_ring));
328288ecf49SBenjamin Mikailenko ++tx_ring->ring_stats->tx_stats.restart_q;
3292b245cb2SAnirudh Venkataramanan }
3302b245cb2SAnirudh Venkataramanan }
3312b245cb2SAnirudh Venkataramanan
3322b245cb2SAnirudh Venkataramanan return !!budget;
3332b245cb2SAnirudh Venkataramanan }
3342b245cb2SAnirudh Venkataramanan
3352b245cb2SAnirudh Venkataramanan /**
336cdedef59SAnirudh Venkataramanan * ice_setup_tx_ring - Allocate the Tx descriptors
337d337f2afSAnirudh Venkataramanan * @tx_ring: the Tx ring to set up
338cdedef59SAnirudh Venkataramanan *
339cdedef59SAnirudh Venkataramanan * Return 0 on success, negative on error
340cdedef59SAnirudh Venkataramanan */
ice_setup_tx_ring(struct ice_tx_ring * tx_ring)341e72bba21SMaciej Fijalkowski int ice_setup_tx_ring(struct ice_tx_ring *tx_ring)
342cdedef59SAnirudh Venkataramanan {
343cdedef59SAnirudh Venkataramanan struct device *dev = tx_ring->dev;
344e72bba21SMaciej Fijalkowski u32 size;
345cdedef59SAnirudh Venkataramanan
346cdedef59SAnirudh Venkataramanan if (!dev)
347cdedef59SAnirudh Venkataramanan return -ENOMEM;
348cdedef59SAnirudh Venkataramanan
349cdedef59SAnirudh Venkataramanan /* warn if we are about to overwrite the pointer */
350cdedef59SAnirudh Venkataramanan WARN_ON(tx_ring->tx_buf);
351c6dfd690SBruce Allan tx_ring->tx_buf =
3526f332353SGustavo A. R. Silva devm_kcalloc(dev, sizeof(*tx_ring->tx_buf), tx_ring->count,
353c6dfd690SBruce Allan GFP_KERNEL);
354cdedef59SAnirudh Venkataramanan if (!tx_ring->tx_buf)
355cdedef59SAnirudh Venkataramanan return -ENOMEM;
356cdedef59SAnirudh Venkataramanan
357ad71b256SBrett Creeley /* round up to nearest page */
358e72bba21SMaciej Fijalkowski size = ALIGN(tx_ring->count * sizeof(struct ice_tx_desc),
359ad71b256SBrett Creeley PAGE_SIZE);
360e72bba21SMaciej Fijalkowski tx_ring->desc = dmam_alloc_coherent(dev, size, &tx_ring->dma,
361cdedef59SAnirudh Venkataramanan GFP_KERNEL);
362cdedef59SAnirudh Venkataramanan if (!tx_ring->desc) {
363cdedef59SAnirudh Venkataramanan dev_err(dev, "Unable to allocate memory for the Tx descriptor ring, size=%d\n",
364e72bba21SMaciej Fijalkowski size);
365cdedef59SAnirudh Venkataramanan goto err;
366cdedef59SAnirudh Venkataramanan }
367cdedef59SAnirudh Venkataramanan
368cdedef59SAnirudh Venkataramanan tx_ring->next_to_use = 0;
369cdedef59SAnirudh Venkataramanan tx_ring->next_to_clean = 0;
370288ecf49SBenjamin Mikailenko tx_ring->ring_stats->tx_stats.prev_pkt = -1;
371cdedef59SAnirudh Venkataramanan return 0;
372cdedef59SAnirudh Venkataramanan
373cdedef59SAnirudh Venkataramanan err:
374cdedef59SAnirudh Venkataramanan devm_kfree(dev, tx_ring->tx_buf);
375cdedef59SAnirudh Venkataramanan tx_ring->tx_buf = NULL;
376cdedef59SAnirudh Venkataramanan return -ENOMEM;
377cdedef59SAnirudh Venkataramanan }
378cdedef59SAnirudh Venkataramanan
379cdedef59SAnirudh Venkataramanan /**
380cdedef59SAnirudh Venkataramanan * ice_clean_rx_ring - Free Rx buffers
381cdedef59SAnirudh Venkataramanan * @rx_ring: ring to be cleaned
382cdedef59SAnirudh Venkataramanan */
ice_clean_rx_ring(struct ice_rx_ring * rx_ring)383e72bba21SMaciej Fijalkowski void ice_clean_rx_ring(struct ice_rx_ring *rx_ring)
384cdedef59SAnirudh Venkataramanan {
3852fba7dc5SMaciej Fijalkowski struct xdp_buff *xdp = &rx_ring->xdp;
386cdedef59SAnirudh Venkataramanan struct device *dev = rx_ring->dev;
387e72bba21SMaciej Fijalkowski u32 size;
388cdedef59SAnirudh Venkataramanan u16 i;
389cdedef59SAnirudh Venkataramanan
390cdedef59SAnirudh Venkataramanan /* ring already cleared, nothing to do */
391cdedef59SAnirudh Venkataramanan if (!rx_ring->rx_buf)
392cdedef59SAnirudh Venkataramanan return;
393cdedef59SAnirudh Venkataramanan
3941742b3d5SMagnus Karlsson if (rx_ring->xsk_pool) {
3952d4238f5SKrzysztof Kazimierczak ice_xsk_clean_rx_ring(rx_ring);
3962d4238f5SKrzysztof Kazimierczak goto rx_skip_free;
3972d4238f5SKrzysztof Kazimierczak }
3982d4238f5SKrzysztof Kazimierczak
3992fba7dc5SMaciej Fijalkowski if (xdp->data) {
4002fba7dc5SMaciej Fijalkowski xdp_return_buff(xdp);
4012fba7dc5SMaciej Fijalkowski xdp->data = NULL;
4022fba7dc5SMaciej Fijalkowski }
4032fba7dc5SMaciej Fijalkowski
404cdedef59SAnirudh Venkataramanan /* Free all the Rx ring sk_buffs */
405cdedef59SAnirudh Venkataramanan for (i = 0; i < rx_ring->count; i++) {
406cdedef59SAnirudh Venkataramanan struct ice_rx_buf *rx_buf = &rx_ring->rx_buf[i];
407cdedef59SAnirudh Venkataramanan
408cdedef59SAnirudh Venkataramanan if (!rx_buf->page)
409cdedef59SAnirudh Venkataramanan continue;
410cdedef59SAnirudh Venkataramanan
411a65f71feSMaciej Fijalkowski /* Invalidate cache lines that may have been written to by
412a65f71feSMaciej Fijalkowski * device so that we avoid corrupting memory.
413a65f71feSMaciej Fijalkowski */
414a65f71feSMaciej Fijalkowski dma_sync_single_range_for_cpu(dev, rx_buf->dma,
415a65f71feSMaciej Fijalkowski rx_buf->page_offset,
4167237f5b0SMaciej Fijalkowski rx_ring->rx_buf_len,
4177237f5b0SMaciej Fijalkowski DMA_FROM_DEVICE);
418a65f71feSMaciej Fijalkowski
419a65f71feSMaciej Fijalkowski /* free resources associated with mapping */
4207237f5b0SMaciej Fijalkowski dma_unmap_page_attrs(dev, rx_buf->dma, ice_rx_pg_size(rx_ring),
421a65f71feSMaciej Fijalkowski DMA_FROM_DEVICE, ICE_RX_DMA_ATTR);
42203c66a13SMaciej Fijalkowski __page_frag_cache_drain(rx_buf->page, rx_buf->pagecnt_bias);
423cdedef59SAnirudh Venkataramanan
424cdedef59SAnirudh Venkataramanan rx_buf->page = NULL;
425cdedef59SAnirudh Venkataramanan rx_buf->page_offset = 0;
426cdedef59SAnirudh Venkataramanan }
427cdedef59SAnirudh Venkataramanan
4282d4238f5SKrzysztof Kazimierczak rx_skip_free:
429617f3e1bSMaciej Fijalkowski if (rx_ring->xsk_pool)
430617f3e1bSMaciej Fijalkowski memset(rx_ring->xdp_buf, 0, array_size(rx_ring->count, sizeof(*rx_ring->xdp_buf)));
431617f3e1bSMaciej Fijalkowski else
432617f3e1bSMaciej Fijalkowski memset(rx_ring->rx_buf, 0, array_size(rx_ring->count, sizeof(*rx_ring->rx_buf)));
433cdedef59SAnirudh Venkataramanan
434cdedef59SAnirudh Venkataramanan /* Zero out the descriptor ring */
435e72bba21SMaciej Fijalkowski size = ALIGN(rx_ring->count * sizeof(union ice_32byte_rx_desc),
436e72bba21SMaciej Fijalkowski PAGE_SIZE);
437e72bba21SMaciej Fijalkowski memset(rx_ring->desc, 0, size);
438cdedef59SAnirudh Venkataramanan
439cdedef59SAnirudh Venkataramanan rx_ring->next_to_alloc = 0;
440cdedef59SAnirudh Venkataramanan rx_ring->next_to_clean = 0;
4412fba7dc5SMaciej Fijalkowski rx_ring->first_desc = 0;
442cdedef59SAnirudh Venkataramanan rx_ring->next_to_use = 0;
443cdedef59SAnirudh Venkataramanan }
444cdedef59SAnirudh Venkataramanan
445cdedef59SAnirudh Venkataramanan /**
446cdedef59SAnirudh Venkataramanan * ice_free_rx_ring - Free Rx resources
447cdedef59SAnirudh Venkataramanan * @rx_ring: ring to clean the resources from
448cdedef59SAnirudh Venkataramanan *
449cdedef59SAnirudh Venkataramanan * Free all receive software resources
450cdedef59SAnirudh Venkataramanan */
ice_free_rx_ring(struct ice_rx_ring * rx_ring)451e72bba21SMaciej Fijalkowski void ice_free_rx_ring(struct ice_rx_ring *rx_ring)
452cdedef59SAnirudh Venkataramanan {
453e72bba21SMaciej Fijalkowski u32 size;
454e72bba21SMaciej Fijalkowski
455cdedef59SAnirudh Venkataramanan ice_clean_rx_ring(rx_ring);
456efc2214bSMaciej Fijalkowski if (rx_ring->vsi->type == ICE_VSI_PF)
457efc2214bSMaciej Fijalkowski if (xdp_rxq_info_is_reg(&rx_ring->xdp_rxq))
458efc2214bSMaciej Fijalkowski xdp_rxq_info_unreg(&rx_ring->xdp_rxq);
4596044ca26SMaciej Fijalkowski WRITE_ONCE(rx_ring->xdp_prog, NULL);
460617f3e1bSMaciej Fijalkowski if (rx_ring->xsk_pool) {
461617f3e1bSMaciej Fijalkowski kfree(rx_ring->xdp_buf);
462617f3e1bSMaciej Fijalkowski rx_ring->xdp_buf = NULL;
463617f3e1bSMaciej Fijalkowski } else {
464617f3e1bSMaciej Fijalkowski kfree(rx_ring->rx_buf);
465cdedef59SAnirudh Venkataramanan rx_ring->rx_buf = NULL;
466617f3e1bSMaciej Fijalkowski }
467cdedef59SAnirudh Venkataramanan
468cdedef59SAnirudh Venkataramanan if (rx_ring->desc) {
469e72bba21SMaciej Fijalkowski size = ALIGN(rx_ring->count * sizeof(union ice_32byte_rx_desc),
470e72bba21SMaciej Fijalkowski PAGE_SIZE);
471e72bba21SMaciej Fijalkowski dmam_free_coherent(rx_ring->dev, size,
472cdedef59SAnirudh Venkataramanan rx_ring->desc, rx_ring->dma);
473cdedef59SAnirudh Venkataramanan rx_ring->desc = NULL;
474cdedef59SAnirudh Venkataramanan }
475cdedef59SAnirudh Venkataramanan }
476cdedef59SAnirudh Venkataramanan
477cdedef59SAnirudh Venkataramanan /**
478cdedef59SAnirudh Venkataramanan * ice_setup_rx_ring - Allocate the Rx descriptors
479d337f2afSAnirudh Venkataramanan * @rx_ring: the Rx ring to set up
480cdedef59SAnirudh Venkataramanan *
481cdedef59SAnirudh Venkataramanan * Return 0 on success, negative on error
482cdedef59SAnirudh Venkataramanan */
ice_setup_rx_ring(struct ice_rx_ring * rx_ring)483e72bba21SMaciej Fijalkowski int ice_setup_rx_ring(struct ice_rx_ring *rx_ring)
484cdedef59SAnirudh Venkataramanan {
485cdedef59SAnirudh Venkataramanan struct device *dev = rx_ring->dev;
486e72bba21SMaciej Fijalkowski u32 size;
487cdedef59SAnirudh Venkataramanan
488cdedef59SAnirudh Venkataramanan if (!dev)
489cdedef59SAnirudh Venkataramanan return -ENOMEM;
490cdedef59SAnirudh Venkataramanan
491cdedef59SAnirudh Venkataramanan /* warn if we are about to overwrite the pointer */
492cdedef59SAnirudh Venkataramanan WARN_ON(rx_ring->rx_buf);
493c6dfd690SBruce Allan rx_ring->rx_buf =
494617f3e1bSMaciej Fijalkowski kcalloc(rx_ring->count, sizeof(*rx_ring->rx_buf), GFP_KERNEL);
495cdedef59SAnirudh Venkataramanan if (!rx_ring->rx_buf)
496cdedef59SAnirudh Venkataramanan return -ENOMEM;
497cdedef59SAnirudh Venkataramanan
498ad71b256SBrett Creeley /* round up to nearest page */
499e72bba21SMaciej Fijalkowski size = ALIGN(rx_ring->count * sizeof(union ice_32byte_rx_desc),
500ad71b256SBrett Creeley PAGE_SIZE);
501e72bba21SMaciej Fijalkowski rx_ring->desc = dmam_alloc_coherent(dev, size, &rx_ring->dma,
502cdedef59SAnirudh Venkataramanan GFP_KERNEL);
503cdedef59SAnirudh Venkataramanan if (!rx_ring->desc) {
504cdedef59SAnirudh Venkataramanan dev_err(dev, "Unable to allocate memory for the Rx descriptor ring, size=%d\n",
505e72bba21SMaciej Fijalkowski size);
506cdedef59SAnirudh Venkataramanan goto err;
507cdedef59SAnirudh Venkataramanan }
508cdedef59SAnirudh Venkataramanan
509cdedef59SAnirudh Venkataramanan rx_ring->next_to_use = 0;
510cdedef59SAnirudh Venkataramanan rx_ring->next_to_clean = 0;
5112fba7dc5SMaciej Fijalkowski rx_ring->first_desc = 0;
512efc2214bSMaciej Fijalkowski
513efc2214bSMaciej Fijalkowski if (ice_is_xdp_ena_vsi(rx_ring->vsi))
514efc2214bSMaciej Fijalkowski WRITE_ONCE(rx_ring->xdp_prog, rx_ring->vsi->xdp_prog);
515efc2214bSMaciej Fijalkowski
516cdedef59SAnirudh Venkataramanan return 0;
517cdedef59SAnirudh Venkataramanan
518cdedef59SAnirudh Venkataramanan err:
519617f3e1bSMaciej Fijalkowski kfree(rx_ring->rx_buf);
520cdedef59SAnirudh Venkataramanan rx_ring->rx_buf = NULL;
521cdedef59SAnirudh Venkataramanan return -ENOMEM;
522cdedef59SAnirudh Venkataramanan }
523cdedef59SAnirudh Venkataramanan
524cb0473e0SMaciej Fijalkowski /**
525efc2214bSMaciej Fijalkowski * ice_run_xdp - Executes an XDP program on initialized xdp_buff
526efc2214bSMaciej Fijalkowski * @rx_ring: Rx ring
527efc2214bSMaciej Fijalkowski * @xdp: xdp_buff used as input to the XDP program
528efc2214bSMaciej Fijalkowski * @xdp_prog: XDP program to run
529eb087cd8SMaciej Fijalkowski * @xdp_ring: ring to be used for XDP_TX action
5301dc1a7e7SMaciej Fijalkowski * @rx_buf: Rx buffer to store the XDP action
531d951c14aSLarysa Zaremba * @eop_desc: Last descriptor in packet to read metadata from
532efc2214bSMaciej Fijalkowski *
533efc2214bSMaciej Fijalkowski * Returns any of ICE_XDP_{PASS, CONSUMED, TX, REDIR}
534efc2214bSMaciej Fijalkowski */
5351dc1a7e7SMaciej Fijalkowski static void
ice_run_xdp(struct ice_rx_ring * rx_ring,struct xdp_buff * xdp,struct bpf_prog * xdp_prog,struct ice_tx_ring * xdp_ring,struct ice_rx_buf * rx_buf,union ice_32b_rx_flex_desc * eop_desc)536e72bba21SMaciej Fijalkowski ice_run_xdp(struct ice_rx_ring *rx_ring, struct xdp_buff *xdp,
5371dc1a7e7SMaciej Fijalkowski struct bpf_prog *xdp_prog, struct ice_tx_ring *xdp_ring,
538d951c14aSLarysa Zaremba struct ice_rx_buf *rx_buf, union ice_32b_rx_flex_desc *eop_desc)
539efc2214bSMaciej Fijalkowski {
5401dc1a7e7SMaciej Fijalkowski unsigned int ret = ICE_XDP_PASS;
541efc2214bSMaciej Fijalkowski u32 act;
542efc2214bSMaciej Fijalkowski
5431dc1a7e7SMaciej Fijalkowski if (!xdp_prog)
5441dc1a7e7SMaciej Fijalkowski goto exit;
5451dc1a7e7SMaciej Fijalkowski
546d951c14aSLarysa Zaremba ice_xdp_meta_set_desc(xdp, eop_desc);
547d951c14aSLarysa Zaremba
548efc2214bSMaciej Fijalkowski act = bpf_prog_run_xdp(xdp_prog, xdp);
549efc2214bSMaciej Fijalkowski switch (act) {
550efc2214bSMaciej Fijalkowski case XDP_PASS:
5511dc1a7e7SMaciej Fijalkowski break;
552efc2214bSMaciej Fijalkowski case XDP_TX:
55322bf877eSMaciej Fijalkowski if (static_branch_unlikely(&ice_xdp_locking_key))
55422bf877eSMaciej Fijalkowski spin_lock(&xdp_ring->tx_lock);
555055d0920SAlexander Lobakin ret = __ice_xmit_xdp_ring(xdp, xdp_ring, false);
55622bf877eSMaciej Fijalkowski if (static_branch_unlikely(&ice_xdp_locking_key))
55722bf877eSMaciej Fijalkowski spin_unlock(&xdp_ring->tx_lock);
5581dc1a7e7SMaciej Fijalkowski if (ret == ICE_XDP_CONSUMED)
55989d65df0SMagnus Karlsson goto out_failure;
5601dc1a7e7SMaciej Fijalkowski break;
561efc2214bSMaciej Fijalkowski case XDP_REDIRECT:
5621dc1a7e7SMaciej Fijalkowski if (xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog))
56389d65df0SMagnus Karlsson goto out_failure;
5641dc1a7e7SMaciej Fijalkowski ret = ICE_XDP_REDIR;
5651dc1a7e7SMaciej Fijalkowski break;
566efc2214bSMaciej Fijalkowski default:
567c8064e5bSPaolo Abeni bpf_warn_invalid_xdp_action(rx_ring->netdev, xdp_prog, act);
5684e83fc93SBruce Allan fallthrough;
569efc2214bSMaciej Fijalkowski case XDP_ABORTED:
57089d65df0SMagnus Karlsson out_failure:
571efc2214bSMaciej Fijalkowski trace_xdp_exception(rx_ring->netdev, xdp_prog, act);
5724e83fc93SBruce Allan fallthrough;
573efc2214bSMaciej Fijalkowski case XDP_DROP:
5741dc1a7e7SMaciej Fijalkowski ret = ICE_XDP_CONSUMED;
575efc2214bSMaciej Fijalkowski }
5761dc1a7e7SMaciej Fijalkowski exit:
5772fba7dc5SMaciej Fijalkowski ice_set_rx_bufs_act(xdp, rx_ring, ret);
578efc2214bSMaciej Fijalkowski }
579efc2214bSMaciej Fijalkowski
580efc2214bSMaciej Fijalkowski /**
581ad07f29bSAlexander Lobakin * ice_xmit_xdp_ring - submit frame to XDP ring for transmission
582ad07f29bSAlexander Lobakin * @xdpf: XDP frame that will be converted to XDP buff
583ad07f29bSAlexander Lobakin * @xdp_ring: XDP ring for transmission
584ad07f29bSAlexander Lobakin */
ice_xmit_xdp_ring(const struct xdp_frame * xdpf,struct ice_tx_ring * xdp_ring)585ad07f29bSAlexander Lobakin static int ice_xmit_xdp_ring(const struct xdp_frame *xdpf,
586ad07f29bSAlexander Lobakin struct ice_tx_ring *xdp_ring)
587ad07f29bSAlexander Lobakin {
588ad07f29bSAlexander Lobakin struct xdp_buff xdp;
589ad07f29bSAlexander Lobakin
590ad07f29bSAlexander Lobakin xdp.data_hard_start = (void *)xdpf;
591ad07f29bSAlexander Lobakin xdp.data = xdpf->data;
592ad07f29bSAlexander Lobakin xdp.data_end = xdp.data + xdpf->len;
593ad07f29bSAlexander Lobakin xdp.frame_sz = xdpf->frame_sz;
594ad07f29bSAlexander Lobakin xdp.flags = xdpf->flags;
595ad07f29bSAlexander Lobakin
596ad07f29bSAlexander Lobakin return __ice_xmit_xdp_ring(&xdp, xdp_ring, true);
597ad07f29bSAlexander Lobakin }
598ad07f29bSAlexander Lobakin
599ad07f29bSAlexander Lobakin /**
600efc2214bSMaciej Fijalkowski * ice_xdp_xmit - submit packets to XDP ring for transmission
601efc2214bSMaciej Fijalkowski * @dev: netdev
602efc2214bSMaciej Fijalkowski * @n: number of XDP frames to be transmitted
603efc2214bSMaciej Fijalkowski * @frames: XDP frames to be transmitted
604efc2214bSMaciej Fijalkowski * @flags: transmit flags
605efc2214bSMaciej Fijalkowski *
606fdc13979SLorenzo Bianconi * Returns number of frames successfully sent. Failed frames
607fdc13979SLorenzo Bianconi * will be free'ed by XDP core.
608efc2214bSMaciej Fijalkowski * For error cases, a negative errno code is returned and no-frames
609efc2214bSMaciej Fijalkowski * are transmitted (caller must handle freeing frames).
610efc2214bSMaciej Fijalkowski */
611efc2214bSMaciej Fijalkowski int
ice_xdp_xmit(struct net_device * dev,int n,struct xdp_frame ** frames,u32 flags)612efc2214bSMaciej Fijalkowski ice_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
613efc2214bSMaciej Fijalkowski u32 flags)
614efc2214bSMaciej Fijalkowski {
615efc2214bSMaciej Fijalkowski struct ice_netdev_priv *np = netdev_priv(dev);
616efc2214bSMaciej Fijalkowski unsigned int queue_index = smp_processor_id();
617efc2214bSMaciej Fijalkowski struct ice_vsi *vsi = np->vsi;
618e72bba21SMaciej Fijalkowski struct ice_tx_ring *xdp_ring;
6193246a107SMaciej Fijalkowski struct ice_tx_buf *tx_buf;
620fdc13979SLorenzo Bianconi int nxmit = 0, i;
621efc2214bSMaciej Fijalkowski
622e97fb1aeSAnirudh Venkataramanan if (test_bit(ICE_VSI_DOWN, vsi->state))
623efc2214bSMaciej Fijalkowski return -ENETDOWN;
624efc2214bSMaciej Fijalkowski
625114f398dSLarysa Zaremba if (!ice_is_xdp_ena_vsi(vsi))
626efc2214bSMaciej Fijalkowski return -ENXIO;
627efc2214bSMaciej Fijalkowski
628efc2214bSMaciej Fijalkowski if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
629efc2214bSMaciej Fijalkowski return -EINVAL;
630efc2214bSMaciej Fijalkowski
63122bf877eSMaciej Fijalkowski if (static_branch_unlikely(&ice_xdp_locking_key)) {
63222bf877eSMaciej Fijalkowski queue_index %= vsi->num_xdp_txq;
633efc2214bSMaciej Fijalkowski xdp_ring = vsi->xdp_rings[queue_index];
63422bf877eSMaciej Fijalkowski spin_lock(&xdp_ring->tx_lock);
63522bf877eSMaciej Fijalkowski } else {
636114f398dSLarysa Zaremba /* Generally, should not happen */
637114f398dSLarysa Zaremba if (unlikely(queue_index >= vsi->num_xdp_txq))
638114f398dSLarysa Zaremba return -ENXIO;
63922bf877eSMaciej Fijalkowski xdp_ring = vsi->xdp_rings[queue_index];
64022bf877eSMaciej Fijalkowski }
64122bf877eSMaciej Fijalkowski
6423246a107SMaciej Fijalkowski tx_buf = &xdp_ring->tx_buf[xdp_ring->next_to_use];
643efc2214bSMaciej Fijalkowski for (i = 0; i < n; i++) {
644ad07f29bSAlexander Lobakin const struct xdp_frame *xdpf = frames[i];
645efc2214bSMaciej Fijalkowski int err;
646efc2214bSMaciej Fijalkowski
6473246a107SMaciej Fijalkowski err = ice_xmit_xdp_ring(xdpf, xdp_ring);
648fdc13979SLorenzo Bianconi if (err != ICE_XDP_TX)
649fdc13979SLorenzo Bianconi break;
650fdc13979SLorenzo Bianconi nxmit++;
651efc2214bSMaciej Fijalkowski }
652efc2214bSMaciej Fijalkowski
6533246a107SMaciej Fijalkowski tx_buf->rs_idx = ice_set_rs_bit(xdp_ring);
654efc2214bSMaciej Fijalkowski if (unlikely(flags & XDP_XMIT_FLUSH))
655efc2214bSMaciej Fijalkowski ice_xdp_ring_update_tail(xdp_ring);
656efc2214bSMaciej Fijalkowski
65722bf877eSMaciej Fijalkowski if (static_branch_unlikely(&ice_xdp_locking_key))
65822bf877eSMaciej Fijalkowski spin_unlock(&xdp_ring->tx_lock);
65922bf877eSMaciej Fijalkowski
660fdc13979SLorenzo Bianconi return nxmit;
661efc2214bSMaciej Fijalkowski }
662efc2214bSMaciej Fijalkowski
663efc2214bSMaciej Fijalkowski /**
664cdedef59SAnirudh Venkataramanan * ice_alloc_mapped_page - recycle or make a new page
665cdedef59SAnirudh Venkataramanan * @rx_ring: ring to use
666cdedef59SAnirudh Venkataramanan * @bi: rx_buf struct to modify
667cdedef59SAnirudh Venkataramanan *
668cdedef59SAnirudh Venkataramanan * Returns true if the page was successfully allocated or
669cdedef59SAnirudh Venkataramanan * reused.
670cdedef59SAnirudh Venkataramanan */
671c8b7abddSBruce Allan static bool
ice_alloc_mapped_page(struct ice_rx_ring * rx_ring,struct ice_rx_buf * bi)672e72bba21SMaciej Fijalkowski ice_alloc_mapped_page(struct ice_rx_ring *rx_ring, struct ice_rx_buf *bi)
673cdedef59SAnirudh Venkataramanan {
674cdedef59SAnirudh Venkataramanan struct page *page = bi->page;
675cdedef59SAnirudh Venkataramanan dma_addr_t dma;
676cdedef59SAnirudh Venkataramanan
677cdedef59SAnirudh Venkataramanan /* since we are recycling buffers we should seldom need to alloc */
6787dbc63f0STony Nguyen if (likely(page))
679cdedef59SAnirudh Venkataramanan return true;
680cdedef59SAnirudh Venkataramanan
681cdedef59SAnirudh Venkataramanan /* alloc new page for storage */
6827237f5b0SMaciej Fijalkowski page = dev_alloc_pages(ice_rx_pg_order(rx_ring));
6832b245cb2SAnirudh Venkataramanan if (unlikely(!page)) {
684288ecf49SBenjamin Mikailenko rx_ring->ring_stats->rx_stats.alloc_page_failed++;
685cdedef59SAnirudh Venkataramanan return false;
6862b245cb2SAnirudh Venkataramanan }
687cdedef59SAnirudh Venkataramanan
688cdedef59SAnirudh Venkataramanan /* map page for use */
6897237f5b0SMaciej Fijalkowski dma = dma_map_page_attrs(rx_ring->dev, page, 0, ice_rx_pg_size(rx_ring),
690a65f71feSMaciej Fijalkowski DMA_FROM_DEVICE, ICE_RX_DMA_ATTR);
691cdedef59SAnirudh Venkataramanan
692cdedef59SAnirudh Venkataramanan /* if mapping failed free memory back to system since
693cdedef59SAnirudh Venkataramanan * there isn't much point in holding memory we can't use
694cdedef59SAnirudh Venkataramanan */
695cdedef59SAnirudh Venkataramanan if (dma_mapping_error(rx_ring->dev, dma)) {
6967237f5b0SMaciej Fijalkowski __free_pages(page, ice_rx_pg_order(rx_ring));
697288ecf49SBenjamin Mikailenko rx_ring->ring_stats->rx_stats.alloc_page_failed++;
698cdedef59SAnirudh Venkataramanan return false;
699cdedef59SAnirudh Venkataramanan }
700cdedef59SAnirudh Venkataramanan
701cdedef59SAnirudh Venkataramanan bi->dma = dma;
702cdedef59SAnirudh Venkataramanan bi->page = page;
703f1b1f409SMaciej Fijalkowski bi->page_offset = rx_ring->rx_offset;
70403c66a13SMaciej Fijalkowski page_ref_add(page, USHRT_MAX - 1);
70503c66a13SMaciej Fijalkowski bi->pagecnt_bias = USHRT_MAX;
706cdedef59SAnirudh Venkataramanan
707cdedef59SAnirudh Venkataramanan return true;
708cdedef59SAnirudh Venkataramanan }
709cdedef59SAnirudh Venkataramanan
710cdedef59SAnirudh Venkataramanan /**
711cdedef59SAnirudh Venkataramanan * ice_alloc_rx_bufs - Replace used receive buffers
712cdedef59SAnirudh Venkataramanan * @rx_ring: ring to place buffers on
713cdedef59SAnirudh Venkataramanan * @cleaned_count: number of buffers to replace
714cdedef59SAnirudh Venkataramanan *
715cb7db356SBrett Creeley * Returns false if all allocations were successful, true if any fail. Returning
716cb7db356SBrett Creeley * true signals to the caller that we didn't replace cleaned_count buffers and
717cb7db356SBrett Creeley * there is more work to do.
718cb7db356SBrett Creeley *
719cb7db356SBrett Creeley * First, try to clean "cleaned_count" Rx buffers. Then refill the cleaned Rx
720cb7db356SBrett Creeley * buffers. Then bump tail at most one time. Grouping like this lets us avoid
721cb7db356SBrett Creeley * multiple tail writes per call.
722cdedef59SAnirudh Venkataramanan */
ice_alloc_rx_bufs(struct ice_rx_ring * rx_ring,unsigned int cleaned_count)7232fba7dc5SMaciej Fijalkowski bool ice_alloc_rx_bufs(struct ice_rx_ring *rx_ring, unsigned int cleaned_count)
724cdedef59SAnirudh Venkataramanan {
725cdedef59SAnirudh Venkataramanan union ice_32b_rx_flex_desc *rx_desc;
726cdedef59SAnirudh Venkataramanan u16 ntu = rx_ring->next_to_use;
727cdedef59SAnirudh Venkataramanan struct ice_rx_buf *bi;
728cdedef59SAnirudh Venkataramanan
729cdedef59SAnirudh Venkataramanan /* do nothing if no valid netdev defined */
730148beb61SHenry Tieman if ((!rx_ring->netdev && rx_ring->vsi->type != ICE_VSI_CTRL) ||
731148beb61SHenry Tieman !cleaned_count)
732cdedef59SAnirudh Venkataramanan return false;
733cdedef59SAnirudh Venkataramanan
734f9867df6SAnirudh Venkataramanan /* get the Rx descriptor and buffer based on next_to_use */
735cdedef59SAnirudh Venkataramanan rx_desc = ICE_RX_DESC(rx_ring, ntu);
736cdedef59SAnirudh Venkataramanan bi = &rx_ring->rx_buf[ntu];
737cdedef59SAnirudh Venkataramanan
738cdedef59SAnirudh Venkataramanan do {
739a1e99685SBrett Creeley /* if we fail here, we have work remaining */
740cdedef59SAnirudh Venkataramanan if (!ice_alloc_mapped_page(rx_ring, bi))
741a1e99685SBrett Creeley break;
742cdedef59SAnirudh Venkataramanan
743a65f71feSMaciej Fijalkowski /* sync the buffer for use by the device */
744a65f71feSMaciej Fijalkowski dma_sync_single_range_for_device(rx_ring->dev, bi->dma,
745a65f71feSMaciej Fijalkowski bi->page_offset,
7467237f5b0SMaciej Fijalkowski rx_ring->rx_buf_len,
747a65f71feSMaciej Fijalkowski DMA_FROM_DEVICE);
748a65f71feSMaciej Fijalkowski
749cdedef59SAnirudh Venkataramanan /* Refresh the desc even if buffer_addrs didn't change
750cdedef59SAnirudh Venkataramanan * because each write-back erases this info.
751cdedef59SAnirudh Venkataramanan */
752cdedef59SAnirudh Venkataramanan rx_desc->read.pkt_addr = cpu_to_le64(bi->dma + bi->page_offset);
753cdedef59SAnirudh Venkataramanan
754cdedef59SAnirudh Venkataramanan rx_desc++;
755cdedef59SAnirudh Venkataramanan bi++;
756cdedef59SAnirudh Venkataramanan ntu++;
757cdedef59SAnirudh Venkataramanan if (unlikely(ntu == rx_ring->count)) {
758cdedef59SAnirudh Venkataramanan rx_desc = ICE_RX_DESC(rx_ring, 0);
759cdedef59SAnirudh Venkataramanan bi = rx_ring->rx_buf;
760cdedef59SAnirudh Venkataramanan ntu = 0;
761cdedef59SAnirudh Venkataramanan }
762cdedef59SAnirudh Venkataramanan
763cdedef59SAnirudh Venkataramanan /* clear the status bits for the next_to_use descriptor */
764cdedef59SAnirudh Venkataramanan rx_desc->wb.status_error0 = 0;
765cdedef59SAnirudh Venkataramanan
766cdedef59SAnirudh Venkataramanan cleaned_count--;
767cdedef59SAnirudh Venkataramanan } while (cleaned_count);
768cdedef59SAnirudh Venkataramanan
769cdedef59SAnirudh Venkataramanan if (rx_ring->next_to_use != ntu)
770cdedef59SAnirudh Venkataramanan ice_release_rx_desc(rx_ring, ntu);
771cdedef59SAnirudh Venkataramanan
772a1e99685SBrett Creeley return !!cleaned_count;
773cdedef59SAnirudh Venkataramanan }
7742b245cb2SAnirudh Venkataramanan
7752b245cb2SAnirudh Venkataramanan /**
7761d032bc7SMaciej Fijalkowski * ice_rx_buf_adjust_pg_offset - Prepare Rx buffer for reuse
7771d032bc7SMaciej Fijalkowski * @rx_buf: Rx buffer to adjust
7781d032bc7SMaciej Fijalkowski * @size: Size of adjustment
7792b245cb2SAnirudh Venkataramanan *
7801d032bc7SMaciej Fijalkowski * Update the offset within page so that Rx buf will be ready to be reused.
7811d032bc7SMaciej Fijalkowski * For systems with PAGE_SIZE < 8192 this function will flip the page offset
7821d032bc7SMaciej Fijalkowski * so the second half of page assigned to Rx buffer will be used, otherwise
7834ee656bbSTony Nguyen * the offset is moved by "size" bytes
7842b245cb2SAnirudh Venkataramanan */
7851d032bc7SMaciej Fijalkowski static void
ice_rx_buf_adjust_pg_offset(struct ice_rx_buf * rx_buf,unsigned int size)7861d032bc7SMaciej Fijalkowski ice_rx_buf_adjust_pg_offset(struct ice_rx_buf *rx_buf, unsigned int size)
7872b245cb2SAnirudh Venkataramanan {
7882b245cb2SAnirudh Venkataramanan #if (PAGE_SIZE < 8192)
7891d032bc7SMaciej Fijalkowski /* flip page offset to other buffer */
7901d032bc7SMaciej Fijalkowski rx_buf->page_offset ^= size;
7912b245cb2SAnirudh Venkataramanan #else
7921d032bc7SMaciej Fijalkowski /* move offset up to the next cache line */
7931d032bc7SMaciej Fijalkowski rx_buf->page_offset += size;
7941d032bc7SMaciej Fijalkowski #endif
7952b245cb2SAnirudh Venkataramanan }
7962b245cb2SAnirudh Venkataramanan
7971d032bc7SMaciej Fijalkowski /**
798bbb97808SMaciej Fijalkowski * ice_can_reuse_rx_page - Determine if page can be reused for another Rx
799bbb97808SMaciej Fijalkowski * @rx_buf: buffer containing the page
800bbb97808SMaciej Fijalkowski *
801bbb97808SMaciej Fijalkowski * If page is reusable, we have a green light for calling ice_reuse_rx_page,
802bbb97808SMaciej Fijalkowski * which will assign the current buffer to the buffer that next_to_alloc is
803bbb97808SMaciej Fijalkowski * pointing to; otherwise, the DMA mapping needs to be destroyed and
804bbb97808SMaciej Fijalkowski * page freed
805bbb97808SMaciej Fijalkowski */
8061beb7830SBjörn Töpel static bool
ice_can_reuse_rx_page(struct ice_rx_buf * rx_buf)807ac075339SMaciej Fijalkowski ice_can_reuse_rx_page(struct ice_rx_buf *rx_buf)
808bbb97808SMaciej Fijalkowski {
80903c66a13SMaciej Fijalkowski unsigned int pagecnt_bias = rx_buf->pagecnt_bias;
810bbb97808SMaciej Fijalkowski struct page *page = rx_buf->page;
8112b245cb2SAnirudh Venkataramanan
812a79afa78SAlexander Lobakin /* avoid re-using remote and pfmemalloc pages */
813a79afa78SAlexander Lobakin if (!dev_page_is_reusable(page))
8142b245cb2SAnirudh Venkataramanan return false;
8152b245cb2SAnirudh Venkataramanan
8162b245cb2SAnirudh Venkataramanan /* if we are only owner of page we can reuse it */
817ac075339SMaciej Fijalkowski if (unlikely(rx_buf->pgcnt - pagecnt_bias > 1))
8182b245cb2SAnirudh Venkataramanan return false;
81950b21433SMaciej Fijalkowski #if (PAGE_SIZE >= 8192)
8207237f5b0SMaciej Fijalkowski #define ICE_LAST_OFFSET \
821b966ad83SMaciej Fijalkowski (SKB_WITH_OVERHEAD(PAGE_SIZE) - ICE_RXBUF_3072)
8227237f5b0SMaciej Fijalkowski if (rx_buf->page_offset > ICE_LAST_OFFSET)
8232b245cb2SAnirudh Venkataramanan return false;
82450b21433SMaciej Fijalkowski #endif /* PAGE_SIZE >= 8192) */
8252b245cb2SAnirudh Venkataramanan
82603c66a13SMaciej Fijalkowski /* If we have drained the page fragment pool we need to update
82703c66a13SMaciej Fijalkowski * the pagecnt_bias and page count so that we fully restock the
82803c66a13SMaciej Fijalkowski * number of references the driver holds.
8292b245cb2SAnirudh Venkataramanan */
83003c66a13SMaciej Fijalkowski if (unlikely(pagecnt_bias == 1)) {
83103c66a13SMaciej Fijalkowski page_ref_add(page, USHRT_MAX - 1);
83203c66a13SMaciej Fijalkowski rx_buf->pagecnt_bias = USHRT_MAX;
83303c66a13SMaciej Fijalkowski }
8342b245cb2SAnirudh Venkataramanan
8352b245cb2SAnirudh Venkataramanan return true;
8362b245cb2SAnirudh Venkataramanan }
8372b245cb2SAnirudh Venkataramanan
8382b245cb2SAnirudh Venkataramanan /**
8392fba7dc5SMaciej Fijalkowski * ice_add_xdp_frag - Add contents of Rx buffer to xdp buf as a frag
8407237f5b0SMaciej Fijalkowski * @rx_ring: Rx descriptor ring to transact packets on
8412fba7dc5SMaciej Fijalkowski * @xdp: xdp buff to place the data into
8422b245cb2SAnirudh Venkataramanan * @rx_buf: buffer containing page to add
843712edbbbSMaciej Fijalkowski * @size: packet length from rx_desc
8442b245cb2SAnirudh Venkataramanan *
8452fba7dc5SMaciej Fijalkowski * This function will add the data contained in rx_buf->page to the xdp buf.
8462fba7dc5SMaciej Fijalkowski * It will just attach the page as a frag.
8472b245cb2SAnirudh Venkataramanan */
8482fba7dc5SMaciej Fijalkowski static int
ice_add_xdp_frag(struct ice_rx_ring * rx_ring,struct xdp_buff * xdp,struct ice_rx_buf * rx_buf,const unsigned int size)8492fba7dc5SMaciej Fijalkowski ice_add_xdp_frag(struct ice_rx_ring *rx_ring, struct xdp_buff *xdp,
8502fba7dc5SMaciej Fijalkowski struct ice_rx_buf *rx_buf, const unsigned int size)
8512b245cb2SAnirudh Venkataramanan {
8522fba7dc5SMaciej Fijalkowski struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp);
8532fba7dc5SMaciej Fijalkowski
854ac6f733aSMitch Williams if (!size)
8552fba7dc5SMaciej Fijalkowski return 0;
8562fba7dc5SMaciej Fijalkowski
8572fba7dc5SMaciej Fijalkowski if (!xdp_buff_has_frags(xdp)) {
8582fba7dc5SMaciej Fijalkowski sinfo->nr_frags = 0;
8592fba7dc5SMaciej Fijalkowski sinfo->xdp_frags_size = 0;
8602fba7dc5SMaciej Fijalkowski xdp_buff_set_frags_flag(xdp);
8612fba7dc5SMaciej Fijalkowski }
8622fba7dc5SMaciej Fijalkowski
8632fba7dc5SMaciej Fijalkowski if (unlikely(sinfo->nr_frags == MAX_SKB_FRAGS)) {
8642fba7dc5SMaciej Fijalkowski ice_set_rx_bufs_act(xdp, rx_ring, ICE_XDP_CONSUMED);
8652fba7dc5SMaciej Fijalkowski return -ENOMEM;
8662fba7dc5SMaciej Fijalkowski }
8672fba7dc5SMaciej Fijalkowski
8682fba7dc5SMaciej Fijalkowski __skb_fill_page_desc_noacc(sinfo, sinfo->nr_frags++, rx_buf->page,
8692fba7dc5SMaciej Fijalkowski rx_buf->page_offset, size);
8702fba7dc5SMaciej Fijalkowski sinfo->xdp_frags_size += size;
871ad2047cfSMaciej Fijalkowski /* remember frag count before XDP prog execution; bpf_xdp_adjust_tail()
872ad2047cfSMaciej Fijalkowski * can pop off frags but driver has to handle it on its own
873ad2047cfSMaciej Fijalkowski */
874ad2047cfSMaciej Fijalkowski rx_ring->nr_frags = sinfo->nr_frags;
8752fba7dc5SMaciej Fijalkowski
8762fba7dc5SMaciej Fijalkowski if (page_is_pfmemalloc(rx_buf->page))
8772fba7dc5SMaciej Fijalkowski xdp_buff_set_frag_pfmemalloc(xdp);
8782fba7dc5SMaciej Fijalkowski
8792fba7dc5SMaciej Fijalkowski return 0;
8802b245cb2SAnirudh Venkataramanan }
8812b245cb2SAnirudh Venkataramanan
8822b245cb2SAnirudh Venkataramanan /**
8832b245cb2SAnirudh Venkataramanan * ice_reuse_rx_page - page flip buffer and store it back on the ring
884d337f2afSAnirudh Venkataramanan * @rx_ring: Rx descriptor ring to store buffers on
8852b245cb2SAnirudh Venkataramanan * @old_buf: donor buffer to have page reused
8862b245cb2SAnirudh Venkataramanan *
8872b245cb2SAnirudh Venkataramanan * Synchronizes page for reuse by the adapter
8882b245cb2SAnirudh Venkataramanan */
889c8b7abddSBruce Allan static void
ice_reuse_rx_page(struct ice_rx_ring * rx_ring,struct ice_rx_buf * old_buf)890e72bba21SMaciej Fijalkowski ice_reuse_rx_page(struct ice_rx_ring *rx_ring, struct ice_rx_buf *old_buf)
8912b245cb2SAnirudh Venkataramanan {
8922b245cb2SAnirudh Venkataramanan u16 nta = rx_ring->next_to_alloc;
8932b245cb2SAnirudh Venkataramanan struct ice_rx_buf *new_buf;
8942b245cb2SAnirudh Venkataramanan
8952b245cb2SAnirudh Venkataramanan new_buf = &rx_ring->rx_buf[nta];
8962b245cb2SAnirudh Venkataramanan
8972b245cb2SAnirudh Venkataramanan /* update, and store next to alloc */
8982b245cb2SAnirudh Venkataramanan nta++;
8992b245cb2SAnirudh Venkataramanan rx_ring->next_to_alloc = (nta < rx_ring->count) ? nta : 0;
9002b245cb2SAnirudh Venkataramanan
901712edbbbSMaciej Fijalkowski /* Transfer page from old buffer to new buffer.
902712edbbbSMaciej Fijalkowski * Move each member individually to avoid possible store
903712edbbbSMaciej Fijalkowski * forwarding stalls and unnecessary copy of skb.
904712edbbbSMaciej Fijalkowski */
905712edbbbSMaciej Fijalkowski new_buf->dma = old_buf->dma;
906712edbbbSMaciej Fijalkowski new_buf->page = old_buf->page;
907712edbbbSMaciej Fijalkowski new_buf->page_offset = old_buf->page_offset;
908712edbbbSMaciej Fijalkowski new_buf->pagecnt_bias = old_buf->pagecnt_bias;
9092b245cb2SAnirudh Venkataramanan }
9102b245cb2SAnirudh Venkataramanan
9112b245cb2SAnirudh Venkataramanan /**
9126c869cb7SMaciej Fijalkowski * ice_get_rx_buf - Fetch Rx buffer and synchronize data for use
913d337f2afSAnirudh Venkataramanan * @rx_ring: Rx descriptor ring to transact packets on
9146c869cb7SMaciej Fijalkowski * @size: size of buffer to add to skb
91566ceaa4cSJesse Brandeburg * @ntc: index of next to clean element
9162b245cb2SAnirudh Venkataramanan *
9176c869cb7SMaciej Fijalkowski * This function will pull an Rx buffer from the ring and synchronize it
9186c869cb7SMaciej Fijalkowski * for use by the CPU.
9192b245cb2SAnirudh Venkataramanan */
9206c869cb7SMaciej Fijalkowski static struct ice_rx_buf *
ice_get_rx_buf(struct ice_rx_ring * rx_ring,const unsigned int size,const unsigned int ntc)921d7956d81SMaciej Fijalkowski ice_get_rx_buf(struct ice_rx_ring *rx_ring, const unsigned int size,
922d7956d81SMaciej Fijalkowski const unsigned int ntc)
9232b245cb2SAnirudh Venkataramanan {
9242b245cb2SAnirudh Venkataramanan struct ice_rx_buf *rx_buf;
9252b245cb2SAnirudh Venkataramanan
926d7956d81SMaciej Fijalkowski rx_buf = &rx_ring->rx_buf[ntc];
92750b21433SMaciej Fijalkowski rx_buf->pgcnt = page_count(rx_buf->page);
9286c869cb7SMaciej Fijalkowski prefetchw(rx_buf->page);
9292b245cb2SAnirudh Venkataramanan
930ac6f733aSMitch Williams if (!size)
931ac6f733aSMitch Williams return rx_buf;
9326c869cb7SMaciej Fijalkowski /* we are reusing so sync this buffer for CPU use */
9336c869cb7SMaciej Fijalkowski dma_sync_single_range_for_cpu(rx_ring->dev, rx_buf->dma,
9346c869cb7SMaciej Fijalkowski rx_buf->page_offset, size,
9356c869cb7SMaciej Fijalkowski DMA_FROM_DEVICE);
9362b245cb2SAnirudh Venkataramanan
93703c66a13SMaciej Fijalkowski /* We have pulled a buffer for use, so decrement pagecnt_bias */
93803c66a13SMaciej Fijalkowski rx_buf->pagecnt_bias--;
93903c66a13SMaciej Fijalkowski
9406c869cb7SMaciej Fijalkowski return rx_buf;
9416c869cb7SMaciej Fijalkowski }
9426c869cb7SMaciej Fijalkowski
9436c869cb7SMaciej Fijalkowski /**
944aaf27254SMaciej Fijalkowski * ice_build_skb - Build skb around an existing buffer
945aaf27254SMaciej Fijalkowski * @rx_ring: Rx descriptor ring to transact packets on
946aaf27254SMaciej Fijalkowski * @xdp: xdp_buff pointing to the data
947aaf27254SMaciej Fijalkowski *
9482fba7dc5SMaciej Fijalkowski * This function builds an skb around an existing XDP buffer, taking care
9492fba7dc5SMaciej Fijalkowski * to set up the skb correctly and avoid any memcpy overhead. Driver has
9502fba7dc5SMaciej Fijalkowski * already combined frags (if any) to skb_shared_info.
951aaf27254SMaciej Fijalkowski */
952aaf27254SMaciej Fijalkowski static struct sk_buff *
ice_build_skb(struct ice_rx_ring * rx_ring,struct xdp_buff * xdp)9532fba7dc5SMaciej Fijalkowski ice_build_skb(struct ice_rx_ring *rx_ring, struct xdp_buff *xdp)
954aaf27254SMaciej Fijalkowski {
95588865fc4SKarol Kolacinski u8 metasize = xdp->data - xdp->data_meta;
9562fba7dc5SMaciej Fijalkowski struct skb_shared_info *sinfo = NULL;
9572fba7dc5SMaciej Fijalkowski unsigned int nr_frags;
958aaf27254SMaciej Fijalkowski struct sk_buff *skb;
959aaf27254SMaciej Fijalkowski
9602fba7dc5SMaciej Fijalkowski if (unlikely(xdp_buff_has_frags(xdp))) {
9612fba7dc5SMaciej Fijalkowski sinfo = xdp_get_shared_info_from_buff(xdp);
9622fba7dc5SMaciej Fijalkowski nr_frags = sinfo->nr_frags;
9632fba7dc5SMaciej Fijalkowski }
9642fba7dc5SMaciej Fijalkowski
965aaf27254SMaciej Fijalkowski /* Prefetch first cache line of first page. If xdp->data_meta
966aaf27254SMaciej Fijalkowski * is unused, this points exactly as xdp->data, otherwise we
967aaf27254SMaciej Fijalkowski * likely have a consumer accessing first few bytes of meta
968aaf27254SMaciej Fijalkowski * data, and then actual data.
969aaf27254SMaciej Fijalkowski */
970f468f21bSTariq Toukan net_prefetch(xdp->data_meta);
971aaf27254SMaciej Fijalkowski /* build an skb around the page buffer */
9728a11b334SMaciej Fijalkowski skb = napi_build_skb(xdp->data_hard_start, xdp->frame_sz);
973aaf27254SMaciej Fijalkowski if (unlikely(!skb))
974aaf27254SMaciej Fijalkowski return NULL;
975aaf27254SMaciej Fijalkowski
976aaf27254SMaciej Fijalkowski /* must to record Rx queue, otherwise OS features such as
977aaf27254SMaciej Fijalkowski * symmetric queue won't work
978aaf27254SMaciej Fijalkowski */
979aaf27254SMaciej Fijalkowski skb_record_rx_queue(skb, rx_ring->q_index);
980aaf27254SMaciej Fijalkowski
981aaf27254SMaciej Fijalkowski /* update pointers within the skb to store the data */
982aaf27254SMaciej Fijalkowski skb_reserve(skb, xdp->data - xdp->data_hard_start);
983aaf27254SMaciej Fijalkowski __skb_put(skb, xdp->data_end - xdp->data);
984aaf27254SMaciej Fijalkowski if (metasize)
985aaf27254SMaciej Fijalkowski skb_metadata_set(skb, metasize);
986aaf27254SMaciej Fijalkowski
9872fba7dc5SMaciej Fijalkowski if (unlikely(xdp_buff_has_frags(xdp)))
9882fba7dc5SMaciej Fijalkowski xdp_update_skb_shared_info(skb, nr_frags,
9892fba7dc5SMaciej Fijalkowski sinfo->xdp_frags_size,
9902fba7dc5SMaciej Fijalkowski nr_frags * xdp->frame_sz,
9912fba7dc5SMaciej Fijalkowski xdp_buff_is_frag_pfmemalloc(xdp));
9922fba7dc5SMaciej Fijalkowski
993aaf27254SMaciej Fijalkowski return skb;
994aaf27254SMaciej Fijalkowski }
995aaf27254SMaciej Fijalkowski
996aaf27254SMaciej Fijalkowski /**
997712edbbbSMaciej Fijalkowski * ice_construct_skb - Allocate skb and populate it
9982b245cb2SAnirudh Venkataramanan * @rx_ring: Rx descriptor ring to transact packets on
999efc2214bSMaciej Fijalkowski * @xdp: xdp_buff pointing to the data
10002b245cb2SAnirudh Venkataramanan *
1001712edbbbSMaciej Fijalkowski * This function allocates an skb. It then populates it with the page
1002712edbbbSMaciej Fijalkowski * data from the current receive descriptor, taking care to set up the
1003712edbbbSMaciej Fijalkowski * skb correctly.
10042b245cb2SAnirudh Venkataramanan */
1005c8b7abddSBruce Allan static struct sk_buff *
ice_construct_skb(struct ice_rx_ring * rx_ring,struct xdp_buff * xdp)10062fba7dc5SMaciej Fijalkowski ice_construct_skb(struct ice_rx_ring *rx_ring, struct xdp_buff *xdp)
10072b245cb2SAnirudh Venkataramanan {
1008efc2214bSMaciej Fijalkowski unsigned int size = xdp->data_end - xdp->data;
10092fba7dc5SMaciej Fijalkowski struct skb_shared_info *sinfo = NULL;
10102fba7dc5SMaciej Fijalkowski struct ice_rx_buf *rx_buf;
10112fba7dc5SMaciej Fijalkowski unsigned int nr_frags = 0;
1012712edbbbSMaciej Fijalkowski unsigned int headlen;
1013712edbbbSMaciej Fijalkowski struct sk_buff *skb;
10142b245cb2SAnirudh Venkataramanan
10152b245cb2SAnirudh Venkataramanan /* prefetch first cache line of first page */
1016c61bcebdSMaciej Fijalkowski net_prefetch(xdp->data);
10172b245cb2SAnirudh Venkataramanan
10182fba7dc5SMaciej Fijalkowski if (unlikely(xdp_buff_has_frags(xdp))) {
10192fba7dc5SMaciej Fijalkowski sinfo = xdp_get_shared_info_from_buff(xdp);
10202fba7dc5SMaciej Fijalkowski nr_frags = sinfo->nr_frags;
10212fba7dc5SMaciej Fijalkowski }
10222fba7dc5SMaciej Fijalkowski
10232b245cb2SAnirudh Venkataramanan /* allocate a skb to store the frags */
10246e9b0190SJakub Kicinski skb = napi_alloc_skb(&rx_ring->q_vector->napi, ICE_RX_HDR_SIZE);
1025712edbbbSMaciej Fijalkowski if (unlikely(!skb))
10262b245cb2SAnirudh Venkataramanan return NULL;
10272b245cb2SAnirudh Venkataramanan
10282fba7dc5SMaciej Fijalkowski rx_buf = &rx_ring->rx_buf[rx_ring->first_desc];
10292b245cb2SAnirudh Venkataramanan skb_record_rx_queue(skb, rx_ring->q_index);
1030712edbbbSMaciej Fijalkowski /* Determine available headroom for copy */
1031712edbbbSMaciej Fijalkowski headlen = size;
1032712edbbbSMaciej Fijalkowski if (headlen > ICE_RX_HDR_SIZE)
1033efc2214bSMaciej Fijalkowski headlen = eth_get_headlen(skb->dev, xdp->data, ICE_RX_HDR_SIZE);
10342b245cb2SAnirudh Venkataramanan
1035712edbbbSMaciej Fijalkowski /* align pull length to size of long to optimize memcpy performance */
1036c61bcebdSMaciej Fijalkowski memcpy(__skb_put(skb, headlen), xdp->data, ALIGN(headlen,
1037c61bcebdSMaciej Fijalkowski sizeof(long)));
1038712edbbbSMaciej Fijalkowski
1039712edbbbSMaciej Fijalkowski /* if we exhaust the linear part then add what is left as a frag */
1040712edbbbSMaciej Fijalkowski size -= headlen;
1041712edbbbSMaciej Fijalkowski if (size) {
10422fba7dc5SMaciej Fijalkowski /* besides adding here a partial frag, we are going to add
10432fba7dc5SMaciej Fijalkowski * frags from xdp_buff, make sure there is enough space for
10442fba7dc5SMaciej Fijalkowski * them
10452fba7dc5SMaciej Fijalkowski */
10462fba7dc5SMaciej Fijalkowski if (unlikely(nr_frags >= MAX_SKB_FRAGS - 1)) {
10472fba7dc5SMaciej Fijalkowski dev_kfree_skb(skb);
10482fba7dc5SMaciej Fijalkowski return NULL;
10492fba7dc5SMaciej Fijalkowski }
1050712edbbbSMaciej Fijalkowski skb_add_rx_frag(skb, 0, rx_buf->page,
10518a11b334SMaciej Fijalkowski rx_buf->page_offset + headlen, size,
10528a11b334SMaciej Fijalkowski xdp->frame_sz);
10532b245cb2SAnirudh Venkataramanan } else {
10541dc1a7e7SMaciej Fijalkowski /* buffer is unused, change the act that should be taken later
10551dc1a7e7SMaciej Fijalkowski * on; data was copied onto skb's linear part so there's no
10561dc1a7e7SMaciej Fijalkowski * need for adjusting page offset and we can reuse this buffer
10571dc1a7e7SMaciej Fijalkowski * as-is
1058712edbbbSMaciej Fijalkowski */
10592fba7dc5SMaciej Fijalkowski rx_buf->act = ICE_SKB_CONSUMED;
10602fba7dc5SMaciej Fijalkowski }
10612fba7dc5SMaciej Fijalkowski
10622fba7dc5SMaciej Fijalkowski if (unlikely(xdp_buff_has_frags(xdp))) {
10632fba7dc5SMaciej Fijalkowski struct skb_shared_info *skinfo = skb_shinfo(skb);
10642fba7dc5SMaciej Fijalkowski
10652fba7dc5SMaciej Fijalkowski memcpy(&skinfo->frags[skinfo->nr_frags], &sinfo->frags[0],
10662fba7dc5SMaciej Fijalkowski sizeof(skb_frag_t) * nr_frags);
10672fba7dc5SMaciej Fijalkowski
10682fba7dc5SMaciej Fijalkowski xdp_update_skb_shared_info(skb, skinfo->nr_frags + nr_frags,
10692fba7dc5SMaciej Fijalkowski sinfo->xdp_frags_size,
10702fba7dc5SMaciej Fijalkowski nr_frags * xdp->frame_sz,
10712fba7dc5SMaciej Fijalkowski xdp_buff_is_frag_pfmemalloc(xdp));
10722b245cb2SAnirudh Venkataramanan }
10732b245cb2SAnirudh Venkataramanan
10742b245cb2SAnirudh Venkataramanan return skb;
10752b245cb2SAnirudh Venkataramanan }
10762b245cb2SAnirudh Venkataramanan
10772b245cb2SAnirudh Venkataramanan /**
10781d032bc7SMaciej Fijalkowski * ice_put_rx_buf - Clean up used buffer and either recycle or free
10791d032bc7SMaciej Fijalkowski * @rx_ring: Rx descriptor ring to transact packets on
10801d032bc7SMaciej Fijalkowski * @rx_buf: Rx buffer to pull data from
10812b245cb2SAnirudh Venkataramanan *
1082d7956d81SMaciej Fijalkowski * This function will clean up the contents of the rx_buf. It will either
1083d7956d81SMaciej Fijalkowski * recycle the buffer or unmap it and free the associated resources.
10842b245cb2SAnirudh Venkataramanan */
10851beb7830SBjörn Töpel static void
ice_put_rx_buf(struct ice_rx_ring * rx_ring,struct ice_rx_buf * rx_buf)1086ac075339SMaciej Fijalkowski ice_put_rx_buf(struct ice_rx_ring *rx_ring, struct ice_rx_buf *rx_buf)
10872b245cb2SAnirudh Venkataramanan {
1088ac6f733aSMitch Williams if (!rx_buf)
1089ac6f733aSMitch Williams return;
1090ac6f733aSMitch Williams
1091ac075339SMaciej Fijalkowski if (ice_can_reuse_rx_page(rx_buf)) {
1092ac6f733aSMitch Williams /* hand second half of page back to the ring */
10932b245cb2SAnirudh Venkataramanan ice_reuse_rx_page(rx_ring, rx_buf);
10942b245cb2SAnirudh Venkataramanan } else {
10952b245cb2SAnirudh Venkataramanan /* we are not reusing the buffer so unmap it */
10967237f5b0SMaciej Fijalkowski dma_unmap_page_attrs(rx_ring->dev, rx_buf->dma,
10977237f5b0SMaciej Fijalkowski ice_rx_pg_size(rx_ring), DMA_FROM_DEVICE,
10987237f5b0SMaciej Fijalkowski ICE_RX_DMA_ATTR);
109903c66a13SMaciej Fijalkowski __page_frag_cache_drain(rx_buf->page, rx_buf->pagecnt_bias);
11002b245cb2SAnirudh Venkataramanan }
11012b245cb2SAnirudh Venkataramanan
11022b245cb2SAnirudh Venkataramanan /* clear contents of buffer_info */
11032b245cb2SAnirudh Venkataramanan rx_buf->page = NULL;
11042b245cb2SAnirudh Venkataramanan }
11052b245cb2SAnirudh Venkataramanan
11062b245cb2SAnirudh Venkataramanan /**
11072b245cb2SAnirudh Venkataramanan * ice_clean_rx_irq - Clean completed descriptors from Rx ring - bounce buf
1108d337f2afSAnirudh Venkataramanan * @rx_ring: Rx descriptor ring to transact packets on
11092b245cb2SAnirudh Venkataramanan * @budget: Total limit on number of packets to process
11102b245cb2SAnirudh Venkataramanan *
11112b245cb2SAnirudh Venkataramanan * This function provides a "bounce buffer" approach to Rx interrupt
11122b245cb2SAnirudh Venkataramanan * processing. The advantage to this is that on systems that have
11132b245cb2SAnirudh Venkataramanan * expensive overhead for IOMMU access this provides a means of avoiding
11142b245cb2SAnirudh Venkataramanan * it by maintaining the mapping of the page to the system.
11152b245cb2SAnirudh Venkataramanan *
11162b245cb2SAnirudh Venkataramanan * Returns amount of work completed
11172b245cb2SAnirudh Venkataramanan */
ice_clean_rx_irq(struct ice_rx_ring * rx_ring,int budget)1118e72bba21SMaciej Fijalkowski int ice_clean_rx_irq(struct ice_rx_ring *rx_ring, int budget)
11192b245cb2SAnirudh Venkataramanan {
1120cb0473e0SMaciej Fijalkowski unsigned int total_rx_bytes = 0, total_rx_pkts = 0;
1121f1b1f409SMaciej Fijalkowski unsigned int offset = rx_ring->rx_offset;
1122cb0473e0SMaciej Fijalkowski struct xdp_buff *xdp = &rx_ring->xdp;
1123abaf8d51SMaciej Fijalkowski u32 cached_ntc = rx_ring->first_desc;
1124eb087cd8SMaciej Fijalkowski struct ice_tx_ring *xdp_ring = NULL;
1125efc2214bSMaciej Fijalkowski struct bpf_prog *xdp_prog = NULL;
1126d7956d81SMaciej Fijalkowski u32 ntc = rx_ring->next_to_clean;
1127d7956d81SMaciej Fijalkowski u32 cnt = rx_ring->count;
11281dc1a7e7SMaciej Fijalkowski u32 xdp_xmit = 0;
11293246a107SMaciej Fijalkowski u32 cached_ntu;
1130cb7db356SBrett Creeley bool failure;
11312fba7dc5SMaciej Fijalkowski u32 first;
11322b245cb2SAnirudh Venkataramanan
1133eb087cd8SMaciej Fijalkowski xdp_prog = READ_ONCE(rx_ring->xdp_prog);
11343246a107SMaciej Fijalkowski if (xdp_prog) {
1135eb087cd8SMaciej Fijalkowski xdp_ring = rx_ring->xdp_ring;
11363246a107SMaciej Fijalkowski cached_ntu = xdp_ring->next_to_use;
11373246a107SMaciej Fijalkowski }
1138eb087cd8SMaciej Fijalkowski
1139f9867df6SAnirudh Venkataramanan /* start the loop to process Rx packets bounded by 'budget' */
11402b245cb2SAnirudh Venkataramanan while (likely(total_rx_pkts < (unsigned int)budget)) {
11412b245cb2SAnirudh Venkataramanan union ice_32b_rx_flex_desc *rx_desc;
11426c869cb7SMaciej Fijalkowski struct ice_rx_buf *rx_buf;
11432fba7dc5SMaciej Fijalkowski struct sk_buff *skb;
11446c869cb7SMaciej Fijalkowski unsigned int size;
11452b245cb2SAnirudh Venkataramanan u16 stat_err_bits;
1146714ed949SLarysa Zaremba u16 vlan_tci;
11472b245cb2SAnirudh Venkataramanan
1148f9867df6SAnirudh Venkataramanan /* get the Rx desc from Rx ring based on 'next_to_clean' */
1149d7956d81SMaciej Fijalkowski rx_desc = ICE_RX_DESC(rx_ring, ntc);
11502b245cb2SAnirudh Venkataramanan
11512b245cb2SAnirudh Venkataramanan /* status_error_len will always be zero for unused descriptors
11522b245cb2SAnirudh Venkataramanan * because it's cleared in cleanup, and overlaps with hdr_addr
11532b245cb2SAnirudh Venkataramanan * which is always zero because packet split isn't used, if the
11542b245cb2SAnirudh Venkataramanan * hardware wrote DD then it will be non-zero
11552b245cb2SAnirudh Venkataramanan */
11562b245cb2SAnirudh Venkataramanan stat_err_bits = BIT(ICE_RX_FLEX_DESC_STATUS0_DD_S);
11570d54d8f7SBrett Creeley if (!ice_test_staterr(rx_desc->wb.status_error0, stat_err_bits))
11582b245cb2SAnirudh Venkataramanan break;
11592b245cb2SAnirudh Venkataramanan
11602b245cb2SAnirudh Venkataramanan /* This memory barrier is needed to keep us from reading
11612b245cb2SAnirudh Venkataramanan * any other fields out of the rx_desc until we know the
11622b245cb2SAnirudh Venkataramanan * DD bit is set.
11632b245cb2SAnirudh Venkataramanan */
11642b245cb2SAnirudh Venkataramanan dma_rmb();
11652b245cb2SAnirudh Venkataramanan
11663089cf6dSJesse Brandeburg ice_trace(clean_rx_irq, rx_ring, rx_desc);
1167148beb61SHenry Tieman if (rx_desc->wb.rxdid == FDIR_DESC_RXDID || !rx_ring->netdev) {
1168d6218317SQi Zhang struct ice_vsi *ctrl_vsi = rx_ring->vsi;
1169d6218317SQi Zhang
1170d6218317SQi Zhang if (rx_desc->wb.rxdid == FDIR_DESC_RXDID &&
1171b03d519dSJacob Keller ctrl_vsi->vf)
1172d6218317SQi Zhang ice_vc_fdir_irq_handler(ctrl_vsi, rx_desc);
1173d7956d81SMaciej Fijalkowski if (++ntc == cnt)
1174d7956d81SMaciej Fijalkowski ntc = 0;
1175387d42aeSPiotr Raczynski rx_ring->first_desc = ntc;
1176148beb61SHenry Tieman continue;
1177148beb61SHenry Tieman }
1178148beb61SHenry Tieman
11796c869cb7SMaciej Fijalkowski size = le16_to_cpu(rx_desc->wb.pkt_len) &
11806c869cb7SMaciej Fijalkowski ICE_RX_FLX_DESC_PKT_LEN_M;
11812b245cb2SAnirudh Venkataramanan
1182ac6f733aSMitch Williams /* retrieve a buffer from the ring */
1183d7956d81SMaciej Fijalkowski rx_buf = ice_get_rx_buf(rx_ring, size, ntc);
1184ac6f733aSMitch Williams
11852fba7dc5SMaciej Fijalkowski if (!xdp->data) {
11862fba7dc5SMaciej Fijalkowski void *hard_start;
1187efc2214bSMaciej Fijalkowski
1188be9df4afSLorenzo Bianconi hard_start = page_address(rx_buf->page) + rx_buf->page_offset -
1189be9df4afSLorenzo Bianconi offset;
1190cb0473e0SMaciej Fijalkowski xdp_prepare_buff(xdp, hard_start, offset, size, !!offset);
11912fba7dc5SMaciej Fijalkowski xdp_buff_clear_frags_flag(xdp);
11922fba7dc5SMaciej Fijalkowski } else if (ice_add_xdp_frag(rx_ring, xdp, rx_buf, size)) {
11932b245cb2SAnirudh Venkataramanan break;
1194712edbbbSMaciej Fijalkowski }
1195d7956d81SMaciej Fijalkowski if (++ntc == cnt)
1196d7956d81SMaciej Fijalkowski ntc = 0;
11972b245cb2SAnirudh Venkataramanan
11982b245cb2SAnirudh Venkataramanan /* skip if it is NOP desc */
119929b82f2aSMaciej Fijalkowski if (ice_is_non_eop(rx_ring, rx_desc))
12002b245cb2SAnirudh Venkataramanan continue;
12012b245cb2SAnirudh Venkataramanan
1202d951c14aSLarysa Zaremba ice_run_xdp(rx_ring, xdp, xdp_prog, xdp_ring, rx_buf, rx_desc);
12032fba7dc5SMaciej Fijalkowski if (rx_buf->act == ICE_XDP_PASS)
12042fba7dc5SMaciej Fijalkowski goto construct_skb;
12052fba7dc5SMaciej Fijalkowski total_rx_bytes += xdp_get_buff_len(xdp);
12062fba7dc5SMaciej Fijalkowski total_rx_pkts++;
12072fba7dc5SMaciej Fijalkowski
12082fba7dc5SMaciej Fijalkowski xdp->data = NULL;
12092fba7dc5SMaciej Fijalkowski rx_ring->first_desc = ntc;
1210ad2047cfSMaciej Fijalkowski rx_ring->nr_frags = 0;
12112fba7dc5SMaciej Fijalkowski continue;
12122fba7dc5SMaciej Fijalkowski construct_skb:
12132fba7dc5SMaciej Fijalkowski if (likely(ice_ring_uses_build_skb(rx_ring)))
12142fba7dc5SMaciej Fijalkowski skb = ice_build_skb(rx_ring, xdp);
12152fba7dc5SMaciej Fijalkowski else
12162fba7dc5SMaciej Fijalkowski skb = ice_construct_skb(rx_ring, xdp);
12172fba7dc5SMaciej Fijalkowski /* exit if we failed to retrieve a buffer */
12182fba7dc5SMaciej Fijalkowski if (!skb) {
12192fba7dc5SMaciej Fijalkowski rx_ring->ring_stats->rx_stats.alloc_page_failed++;
12202fba7dc5SMaciej Fijalkowski rx_buf->act = ICE_XDP_CONSUMED;
12212fba7dc5SMaciej Fijalkowski if (unlikely(xdp_buff_has_frags(xdp)))
12222fba7dc5SMaciej Fijalkowski ice_set_rx_bufs_act(xdp, rx_ring,
12232fba7dc5SMaciej Fijalkowski ICE_XDP_CONSUMED);
12242fba7dc5SMaciej Fijalkowski xdp->data = NULL;
12252fba7dc5SMaciej Fijalkowski rx_ring->first_desc = ntc;
1226ad2047cfSMaciej Fijalkowski rx_ring->nr_frags = 0;
12272fba7dc5SMaciej Fijalkowski break;
12282fba7dc5SMaciej Fijalkowski }
12292fba7dc5SMaciej Fijalkowski xdp->data = NULL;
12302fba7dc5SMaciej Fijalkowski rx_ring->first_desc = ntc;
1231ad2047cfSMaciej Fijalkowski rx_ring->nr_frags = 0;
12322fba7dc5SMaciej Fijalkowski
12332b245cb2SAnirudh Venkataramanan stat_err_bits = BIT(ICE_RX_FLEX_DESC_STATUS0_RXE_S);
12340d54d8f7SBrett Creeley if (unlikely(ice_test_staterr(rx_desc->wb.status_error0,
12350d54d8f7SBrett Creeley stat_err_bits))) {
12362b245cb2SAnirudh Venkataramanan dev_kfree_skb_any(skb);
12372b245cb2SAnirudh Venkataramanan continue;
12382b245cb2SAnirudh Venkataramanan }
12392b245cb2SAnirudh Venkataramanan
1240714ed949SLarysa Zaremba vlan_tci = ice_get_vlan_tci(rx_desc);
12412b245cb2SAnirudh Venkataramanan
1242133f4883SKrzysztof Kazimierczak /* pad the skb if needed, to make a valid ethernet frame */
12432fba7dc5SMaciej Fijalkowski if (eth_skb_pad(skb))
12442b245cb2SAnirudh Venkataramanan continue;
12452b245cb2SAnirudh Venkataramanan
12462b245cb2SAnirudh Venkataramanan /* probably a little skewed due to removing CRC */
12472b245cb2SAnirudh Venkataramanan total_rx_bytes += skb->len;
12482b245cb2SAnirudh Venkataramanan
1249d76a60baSAnirudh Venkataramanan /* populate checksum, VLAN, and protocol */
12506b62a421SLarysa Zaremba ice_process_skb_fields(rx_ring, rx_desc, skb);
1251d76a60baSAnirudh Venkataramanan
12523089cf6dSJesse Brandeburg ice_trace(clean_rx_irq_indicate, rx_ring, rx_desc, skb);
12532b245cb2SAnirudh Venkataramanan /* send completed skb up the stack */
1254714ed949SLarysa Zaremba ice_receive_skb(rx_ring, skb, vlan_tci);
12552b245cb2SAnirudh Venkataramanan
12562b245cb2SAnirudh Venkataramanan /* update budget accounting */
12572b245cb2SAnirudh Venkataramanan total_rx_pkts++;
12582b245cb2SAnirudh Venkataramanan }
12592b245cb2SAnirudh Venkataramanan
12602fba7dc5SMaciej Fijalkowski first = rx_ring->first_desc;
12612fba7dc5SMaciej Fijalkowski while (cached_ntc != first) {
12621dc1a7e7SMaciej Fijalkowski struct ice_rx_buf *buf = &rx_ring->rx_buf[cached_ntc];
12631dc1a7e7SMaciej Fijalkowski
12641dc1a7e7SMaciej Fijalkowski if (buf->act & (ICE_XDP_TX | ICE_XDP_REDIR)) {
12651dc1a7e7SMaciej Fijalkowski ice_rx_buf_adjust_pg_offset(buf, xdp->frame_sz);
12661dc1a7e7SMaciej Fijalkowski xdp_xmit |= buf->act;
12671dc1a7e7SMaciej Fijalkowski } else if (buf->act & ICE_XDP_CONSUMED) {
12681dc1a7e7SMaciej Fijalkowski buf->pagecnt_bias++;
12691dc1a7e7SMaciej Fijalkowski } else if (buf->act == ICE_XDP_PASS) {
12701dc1a7e7SMaciej Fijalkowski ice_rx_buf_adjust_pg_offset(buf, xdp->frame_sz);
12711dc1a7e7SMaciej Fijalkowski }
12721dc1a7e7SMaciej Fijalkowski
12731dc1a7e7SMaciej Fijalkowski ice_put_rx_buf(rx_ring, buf);
12741dc1a7e7SMaciej Fijalkowski if (++cached_ntc >= cnt)
12751dc1a7e7SMaciej Fijalkowski cached_ntc = 0;
12761dc1a7e7SMaciej Fijalkowski }
1277d7956d81SMaciej Fijalkowski rx_ring->next_to_clean = ntc;
1278cb7db356SBrett Creeley /* return up to cleaned_count buffers to hardware */
12792fba7dc5SMaciej Fijalkowski failure = ice_alloc_rx_bufs(rx_ring, ICE_RX_DESC_UNUSED(rx_ring));
1280cb7db356SBrett Creeley
12819070fe3dSMaciej Fijalkowski if (xdp_xmit)
12823246a107SMaciej Fijalkowski ice_finalize_xdp_rx(xdp_ring, xdp_xmit, cached_ntu);
1283efc2214bSMaciej Fijalkowski
1284288ecf49SBenjamin Mikailenko if (rx_ring->ring_stats)
1285288ecf49SBenjamin Mikailenko ice_update_rx_ring_stats(rx_ring, total_rx_pkts,
1286288ecf49SBenjamin Mikailenko total_rx_bytes);
12872b245cb2SAnirudh Venkataramanan
12882b245cb2SAnirudh Venkataramanan /* guarantee a trip back through this routine if there was a failure */
12892b245cb2SAnirudh Venkataramanan return failure ? budget : (int)total_rx_pkts;
12902b245cb2SAnirudh Venkataramanan }
12912b245cb2SAnirudh Venkataramanan
__ice_update_sample(struct ice_q_vector * q_vector,struct ice_ring_container * rc,struct dim_sample * sample,bool is_tx)1292d8eb7ad5SJesse Brandeburg static void __ice_update_sample(struct ice_q_vector *q_vector,
1293d8eb7ad5SJesse Brandeburg struct ice_ring_container *rc,
1294d8eb7ad5SJesse Brandeburg struct dim_sample *sample,
1295d8eb7ad5SJesse Brandeburg bool is_tx)
1296d8eb7ad5SJesse Brandeburg {
1297d8eb7ad5SJesse Brandeburg u64 packets = 0, bytes = 0;
1298d8eb7ad5SJesse Brandeburg
1299d8eb7ad5SJesse Brandeburg if (is_tx) {
1300d8eb7ad5SJesse Brandeburg struct ice_tx_ring *tx_ring;
1301d8eb7ad5SJesse Brandeburg
1302d8eb7ad5SJesse Brandeburg ice_for_each_tx_ring(tx_ring, *rc) {
1303288ecf49SBenjamin Mikailenko struct ice_ring_stats *ring_stats;
1304288ecf49SBenjamin Mikailenko
1305288ecf49SBenjamin Mikailenko ring_stats = tx_ring->ring_stats;
1306288ecf49SBenjamin Mikailenko if (!ring_stats)
1307288ecf49SBenjamin Mikailenko continue;
1308288ecf49SBenjamin Mikailenko packets += ring_stats->stats.pkts;
1309288ecf49SBenjamin Mikailenko bytes += ring_stats->stats.bytes;
1310d8eb7ad5SJesse Brandeburg }
1311d8eb7ad5SJesse Brandeburg } else {
1312d8eb7ad5SJesse Brandeburg struct ice_rx_ring *rx_ring;
1313d8eb7ad5SJesse Brandeburg
1314d8eb7ad5SJesse Brandeburg ice_for_each_rx_ring(rx_ring, *rc) {
1315288ecf49SBenjamin Mikailenko struct ice_ring_stats *ring_stats;
1316288ecf49SBenjamin Mikailenko
1317288ecf49SBenjamin Mikailenko ring_stats = rx_ring->ring_stats;
1318288ecf49SBenjamin Mikailenko if (!ring_stats)
1319288ecf49SBenjamin Mikailenko continue;
1320288ecf49SBenjamin Mikailenko packets += ring_stats->stats.pkts;
1321288ecf49SBenjamin Mikailenko bytes += ring_stats->stats.bytes;
1322d8eb7ad5SJesse Brandeburg }
1323d8eb7ad5SJesse Brandeburg }
1324d8eb7ad5SJesse Brandeburg
1325d8eb7ad5SJesse Brandeburg dim_update_sample(q_vector->total_events, packets, bytes, sample);
1326d8eb7ad5SJesse Brandeburg sample->comp_ctr = 0;
1327d8eb7ad5SJesse Brandeburg
1328d8eb7ad5SJesse Brandeburg /* if dim settings get stale, like when not updated for 1
1329d8eb7ad5SJesse Brandeburg * second or longer, force it to start again. This addresses the
1330d8eb7ad5SJesse Brandeburg * frequent case of an idle queue being switched to by the
1331d8eb7ad5SJesse Brandeburg * scheduler. The 1,000 here means 1,000 milliseconds.
1332d8eb7ad5SJesse Brandeburg */
1333d8eb7ad5SJesse Brandeburg if (ktime_ms_delta(sample->time, rc->dim.start_sample.time) >= 1000)
1334d8eb7ad5SJesse Brandeburg rc->dim.state = DIM_START_MEASURE;
1335d8eb7ad5SJesse Brandeburg }
1336d8eb7ad5SJesse Brandeburg
13372b245cb2SAnirudh Venkataramanan /**
1338cdf1f1f1SJacob Keller * ice_net_dim - Update net DIM algorithm
1339cdf1f1f1SJacob Keller * @q_vector: the vector associated with the interrupt
1340711987bbSBrett Creeley *
1341cdf1f1f1SJacob Keller * Create a DIM sample and notify net_dim() so that it can possibly decide
1342cdf1f1f1SJacob Keller * a new ITR value based on incoming packets, bytes, and interrupts.
1343711987bbSBrett Creeley *
1344cdf1f1f1SJacob Keller * This function is a no-op if the ring is not configured to dynamic ITR.
1345711987bbSBrett Creeley */
ice_net_dim(struct ice_q_vector * q_vector)1346cdf1f1f1SJacob Keller static void ice_net_dim(struct ice_q_vector *q_vector)
134764a59d05SAnirudh Venkataramanan {
1348cdf1f1f1SJacob Keller struct ice_ring_container *tx = &q_vector->tx;
1349cdf1f1f1SJacob Keller struct ice_ring_container *rx = &q_vector->rx;
1350cdf1f1f1SJacob Keller
1351d59684a0SJesse Brandeburg if (ITR_IS_DYNAMIC(tx)) {
1352d8eb7ad5SJesse Brandeburg struct dim_sample dim_sample;
1353cdf1f1f1SJacob Keller
1354d8eb7ad5SJesse Brandeburg __ice_update_sample(q_vector, tx, &dim_sample, true);
1355cdf1f1f1SJacob Keller net_dim(&tx->dim, dim_sample);
1356711987bbSBrett Creeley }
1357711987bbSBrett Creeley
1358d59684a0SJesse Brandeburg if (ITR_IS_DYNAMIC(rx)) {
1359d8eb7ad5SJesse Brandeburg struct dim_sample dim_sample;
1360cdf1f1f1SJacob Keller
1361d8eb7ad5SJesse Brandeburg __ice_update_sample(q_vector, rx, &dim_sample, false);
1362cdf1f1f1SJacob Keller net_dim(&rx->dim, dim_sample);
136364a59d05SAnirudh Venkataramanan }
136464a59d05SAnirudh Venkataramanan }
136564a59d05SAnirudh Venkataramanan
13662b245cb2SAnirudh Venkataramanan /**
136763f545edSBrett Creeley * ice_buildreg_itr - build value for writing to the GLINT_DYN_CTL register
136863f545edSBrett Creeley * @itr_idx: interrupt throttling index
136964a59d05SAnirudh Venkataramanan * @itr: interrupt throttling value in usecs
137063f545edSBrett Creeley */
ice_buildreg_itr(u16 itr_idx,u16 itr)13718244dd2dSBrett Creeley static u32 ice_buildreg_itr(u16 itr_idx, u16 itr)
137263f545edSBrett Creeley {
13732f2da36eSAnirudh Venkataramanan /* The ITR value is reported in microseconds, and the register value is
137464a59d05SAnirudh Venkataramanan * recorded in 2 microsecond units. For this reason we only need to
137564a59d05SAnirudh Venkataramanan * shift by the GLINT_DYN_CTL_INTERVAL_S - ICE_ITR_GRAN_S to apply this
137664a59d05SAnirudh Venkataramanan * granularity as a shift instead of division. The mask makes sure the
137764a59d05SAnirudh Venkataramanan * ITR value is never odd so we don't accidentally write into the field
137864a59d05SAnirudh Venkataramanan * prior to the ITR field.
137964a59d05SAnirudh Venkataramanan */
138064a59d05SAnirudh Venkataramanan itr &= ICE_ITR_MASK;
138164a59d05SAnirudh Venkataramanan
138263f545edSBrett Creeley return GLINT_DYN_CTL_INTENA_M | GLINT_DYN_CTL_CLEARPBA_M |
138363f545edSBrett Creeley (itr_idx << GLINT_DYN_CTL_ITR_INDX_S) |
138464a59d05SAnirudh Venkataramanan (itr << (GLINT_DYN_CTL_INTERVAL_S - ICE_ITR_GRAN_S));
138563f545edSBrett Creeley }
138663f545edSBrett Creeley
138763f545edSBrett Creeley /**
1388d8eb7ad5SJesse Brandeburg * ice_enable_interrupt - re-enable MSI-X interrupt
1389cdf1f1f1SJacob Keller * @q_vector: the vector associated with the interrupt to enable
1390cdf1f1f1SJacob Keller *
1391d8eb7ad5SJesse Brandeburg * If the VSI is down, the interrupt will not be re-enabled. Also,
1392d8eb7ad5SJesse Brandeburg * when enabling the interrupt always reset the wb_on_itr to false
1393d8eb7ad5SJesse Brandeburg * and trigger a software interrupt to clean out internal state.
139463f545edSBrett Creeley */
ice_enable_interrupt(struct ice_q_vector * q_vector)1395d8eb7ad5SJesse Brandeburg static void ice_enable_interrupt(struct ice_q_vector *q_vector)
139663f545edSBrett Creeley {
13972fb0821fSJesse Brandeburg struct ice_vsi *vsi = q_vector->vsi;
1398b7306b42SJesse Brandeburg bool wb_en = q_vector->wb_on_itr;
139963f545edSBrett Creeley u32 itr_val;
140063f545edSBrett Creeley
1401cdf1f1f1SJacob Keller if (test_bit(ICE_DOWN, vsi->state))
1402cdf1f1f1SJacob Keller return;
14032ab28bb0SBrett Creeley
140423be7075SJesse Brandeburg /* trigger an ITR delayed software interrupt when exiting busy poll, to
140523be7075SJesse Brandeburg * make sure to catch any pending cleanups that might have been missed
140623be7075SJesse Brandeburg * due to interrupt state transition. If busy poll or poll isn't
140723be7075SJesse Brandeburg * enabled, then don't update ITR, and just enable the interrupt.
1408cdf1f1f1SJacob Keller */
140923be7075SJesse Brandeburg if (!wb_en) {
141023be7075SJesse Brandeburg itr_val = ice_buildreg_itr(ICE_ITR_NONE, 0);
141123be7075SJesse Brandeburg } else {
1412cdf1f1f1SJacob Keller q_vector->wb_on_itr = false;
141364a59d05SAnirudh Venkataramanan
141423be7075SJesse Brandeburg /* do two things here with a single write. Set up the third ITR
141523be7075SJesse Brandeburg * index to be used for software interrupt moderation, and then
141623be7075SJesse Brandeburg * trigger a software interrupt with a rate limit of 20K on
141723be7075SJesse Brandeburg * software interrupts, this will help avoid high interrupt
141823be7075SJesse Brandeburg * loads due to frequently polling and exiting polling.
1419b7306b42SJesse Brandeburg */
142023be7075SJesse Brandeburg itr_val = ice_buildreg_itr(ICE_IDX_ITR2, ICE_ITR_20K);
1421b7306b42SJesse Brandeburg itr_val |= GLINT_DYN_CTL_SWINT_TRIG_M |
142223be7075SJesse Brandeburg ICE_IDX_ITR2 << GLINT_DYN_CTL_SW_ITR_INDX_S |
1423b7306b42SJesse Brandeburg GLINT_DYN_CTL_SW_ITR_INDX_ENA_M;
1424b7306b42SJesse Brandeburg }
14251d9f7ca3SJesse Brandeburg wr32(&vsi->back->hw, GLINT_DYN_CTL(q_vector->reg_idx), itr_val);
142663f545edSBrett Creeley }
142763f545edSBrett Creeley
142863f545edSBrett Creeley /**
14292ab28bb0SBrett Creeley * ice_set_wb_on_itr - set WB_ON_ITR for this q_vector
14302ab28bb0SBrett Creeley * @q_vector: q_vector to set WB_ON_ITR on
14312ab28bb0SBrett Creeley *
14322ab28bb0SBrett Creeley * We need to tell hardware to write-back completed descriptors even when
14332ab28bb0SBrett Creeley * interrupts are disabled. Descriptors will be written back on cache line
14342ab28bb0SBrett Creeley * boundaries without WB_ON_ITR enabled, but if we don't enable WB_ON_ITR
14351d9f7ca3SJesse Brandeburg * descriptors may not be written back if they don't fill a cache line until
14361d9f7ca3SJesse Brandeburg * the next interrupt.
14372ab28bb0SBrett Creeley *
14381d9f7ca3SJesse Brandeburg * This sets the write-back frequency to whatever was set previously for the
14391d9f7ca3SJesse Brandeburg * ITR indices. Also, set the INTENA_MSK bit to make sure hardware knows we
14401d9f7ca3SJesse Brandeburg * aren't meddling with the INTENA_M bit.
14412ab28bb0SBrett Creeley */
ice_set_wb_on_itr(struct ice_q_vector * q_vector)14422fb0821fSJesse Brandeburg static void ice_set_wb_on_itr(struct ice_q_vector *q_vector)
14432ab28bb0SBrett Creeley {
14442fb0821fSJesse Brandeburg struct ice_vsi *vsi = q_vector->vsi;
14452fb0821fSJesse Brandeburg
14461d9f7ca3SJesse Brandeburg /* already in wb_on_itr mode no need to change it */
1447cdf1f1f1SJacob Keller if (q_vector->wb_on_itr)
14482ab28bb0SBrett Creeley return;
14492ab28bb0SBrett Creeley
14501d9f7ca3SJesse Brandeburg /* use previously set ITR values for all of the ITR indices by
14511d9f7ca3SJesse Brandeburg * specifying ICE_ITR_NONE, which will vary in adaptive (AIM) mode and
14521d9f7ca3SJesse Brandeburg * be static in non-adaptive mode (user configured)
14531d9f7ca3SJesse Brandeburg */
14542ab28bb0SBrett Creeley wr32(&vsi->back->hw, GLINT_DYN_CTL(q_vector->reg_idx),
145523eca34eSJesse Brandeburg FIELD_PREP(GLINT_DYN_CTL_ITR_INDX_M, ICE_ITR_NONE) |
145623eca34eSJesse Brandeburg FIELD_PREP(GLINT_DYN_CTL_INTENA_MSK_M, 1) |
145723eca34eSJesse Brandeburg FIELD_PREP(GLINT_DYN_CTL_WB_ON_ITR_M, 1));
14582ab28bb0SBrett Creeley
1459cdf1f1f1SJacob Keller q_vector->wb_on_itr = true;
14602ab28bb0SBrett Creeley }
14612ab28bb0SBrett Creeley
14622ab28bb0SBrett Creeley /**
14632b245cb2SAnirudh Venkataramanan * ice_napi_poll - NAPI polling Rx/Tx cleanup routine
14642b245cb2SAnirudh Venkataramanan * @napi: napi struct with our devices info in it
14652b245cb2SAnirudh Venkataramanan * @budget: amount of work driver is allowed to do this pass, in packets
14662b245cb2SAnirudh Venkataramanan *
14672b245cb2SAnirudh Venkataramanan * This function will clean all queues associated with a q_vector.
14682b245cb2SAnirudh Venkataramanan *
14692b245cb2SAnirudh Venkataramanan * Returns the amount of work done
14702b245cb2SAnirudh Venkataramanan */
ice_napi_poll(struct napi_struct * napi,int budget)14712b245cb2SAnirudh Venkataramanan int ice_napi_poll(struct napi_struct *napi, int budget)
14722b245cb2SAnirudh Venkataramanan {
14732b245cb2SAnirudh Venkataramanan struct ice_q_vector *q_vector =
14742b245cb2SAnirudh Venkataramanan container_of(napi, struct ice_q_vector, napi);
1475e72bba21SMaciej Fijalkowski struct ice_tx_ring *tx_ring;
1476e72bba21SMaciej Fijalkowski struct ice_rx_ring *rx_ring;
14772b245cb2SAnirudh Venkataramanan bool clean_complete = true;
14789118fcd5SBrett Creeley int budget_per_ring;
14792b245cb2SAnirudh Venkataramanan int work_done = 0;
14802b245cb2SAnirudh Venkataramanan
14812b245cb2SAnirudh Venkataramanan /* Since the actual Tx work is minimal, we can give the Tx a larger
14822b245cb2SAnirudh Venkataramanan * budget and be more aggressive about cleaning up the Tx descriptors.
14832b245cb2SAnirudh Venkataramanan */
1484e72bba21SMaciej Fijalkowski ice_for_each_tx_ring(tx_ring, q_vector->tx) {
1485ebc33a3fSMaciej Fijalkowski struct xsk_buff_pool *xsk_pool = READ_ONCE(tx_ring->xsk_pool);
14869610bd98SMaciej Fijalkowski bool wd;
14879610bd98SMaciej Fijalkowski
1488ebc33a3fSMaciej Fijalkowski if (xsk_pool)
1489ebc33a3fSMaciej Fijalkowski wd = ice_xmit_zc(tx_ring, xsk_pool);
14909610bd98SMaciej Fijalkowski else if (ice_ring_is_xdp(tx_ring))
14919610bd98SMaciej Fijalkowski wd = true;
14929610bd98SMaciej Fijalkowski else
14939610bd98SMaciej Fijalkowski wd = ice_clean_tx_irq(tx_ring, budget);
14942d4238f5SKrzysztof Kazimierczak
14952d4238f5SKrzysztof Kazimierczak if (!wd)
14962b245cb2SAnirudh Venkataramanan clean_complete = false;
14972d4238f5SKrzysztof Kazimierczak }
14982b245cb2SAnirudh Venkataramanan
14992b245cb2SAnirudh Venkataramanan /* Handle case where we are called by netpoll with a budget of 0 */
1500d27525ecSJesse Brandeburg if (unlikely(budget <= 0))
15012b245cb2SAnirudh Venkataramanan return budget;
15022b245cb2SAnirudh Venkataramanan
15039118fcd5SBrett Creeley /* normally we have 1 Rx ring per q_vector */
15049118fcd5SBrett Creeley if (unlikely(q_vector->num_ring_rx > 1))
15059118fcd5SBrett Creeley /* We attempt to distribute budget to each Rx queue fairly, but
15069118fcd5SBrett Creeley * don't allow the budget to go below 1 because that would exit
15079118fcd5SBrett Creeley * polling early.
15082b245cb2SAnirudh Venkataramanan */
150988865fc4SKarol Kolacinski budget_per_ring = max_t(int, budget / q_vector->num_ring_rx, 1);
15109118fcd5SBrett Creeley else
15119118fcd5SBrett Creeley /* Max of 1 Rx ring in this q_vector so give it the budget */
15129118fcd5SBrett Creeley budget_per_ring = budget;
15132b245cb2SAnirudh Venkataramanan
1514e72bba21SMaciej Fijalkowski ice_for_each_rx_ring(rx_ring, q_vector->rx) {
1515ebc33a3fSMaciej Fijalkowski struct xsk_buff_pool *xsk_pool = READ_ONCE(rx_ring->xsk_pool);
15162b245cb2SAnirudh Venkataramanan int cleaned;
15172b245cb2SAnirudh Venkataramanan
15182d4238f5SKrzysztof Kazimierczak /* A dedicated path for zero-copy allows making a single
15192d4238f5SKrzysztof Kazimierczak * comparison in the irq context instead of many inside the
15202d4238f5SKrzysztof Kazimierczak * ice_clean_rx_irq function and makes the codebase cleaner.
15212d4238f5SKrzysztof Kazimierczak */
1522e72bba21SMaciej Fijalkowski cleaned = rx_ring->xsk_pool ?
1523ebc33a3fSMaciej Fijalkowski ice_clean_rx_irq_zc(rx_ring, xsk_pool, budget_per_ring) :
1524e72bba21SMaciej Fijalkowski ice_clean_rx_irq(rx_ring, budget_per_ring);
15252b245cb2SAnirudh Venkataramanan work_done += cleaned;
15262b245cb2SAnirudh Venkataramanan /* if we clean as many as budgeted, we must not be done */
15272b245cb2SAnirudh Venkataramanan if (cleaned >= budget_per_ring)
15282b245cb2SAnirudh Venkataramanan clean_complete = false;
15292b245cb2SAnirudh Venkataramanan }
15302b245cb2SAnirudh Venkataramanan
15312b245cb2SAnirudh Venkataramanan /* If work not completed, return budget and polling will return */
15321d9f7ca3SJesse Brandeburg if (!clean_complete) {
15331d9f7ca3SJesse Brandeburg /* Set the writeback on ITR so partial completions of
15341d9f7ca3SJesse Brandeburg * cache-lines will still continue even if we're polling.
15351d9f7ca3SJesse Brandeburg */
15361d9f7ca3SJesse Brandeburg ice_set_wb_on_itr(q_vector);
15372b245cb2SAnirudh Venkataramanan return budget;
15381d9f7ca3SJesse Brandeburg }
15392b245cb2SAnirudh Venkataramanan
15400bcd952fSJesse Brandeburg /* Exit the polling mode, but don't re-enable interrupts if stack might
15410bcd952fSJesse Brandeburg * poll us due to busy-polling
15420bcd952fSJesse Brandeburg */
1543a4e18669SMaciej Fijalkowski if (napi_complete_done(napi, work_done)) {
1544d8eb7ad5SJesse Brandeburg ice_net_dim(q_vector);
1545d8eb7ad5SJesse Brandeburg ice_enable_interrupt(q_vector);
1546d8eb7ad5SJesse Brandeburg } else {
15472fb0821fSJesse Brandeburg ice_set_wb_on_itr(q_vector);
1548d8eb7ad5SJesse Brandeburg }
1549e0c9fd9bSDave Ertman
155032a64994SBruce Allan return min_t(int, work_done, budget - 1);
15512b245cb2SAnirudh Venkataramanan }
15522b245cb2SAnirudh Venkataramanan
15532b245cb2SAnirudh Venkataramanan /**
1554d337f2afSAnirudh Venkataramanan * __ice_maybe_stop_tx - 2nd level check for Tx stop conditions
15552b245cb2SAnirudh Venkataramanan * @tx_ring: the ring to be checked
15562b245cb2SAnirudh Venkataramanan * @size: the size buffer we want to assure is available
15572b245cb2SAnirudh Venkataramanan *
15582b245cb2SAnirudh Venkataramanan * Returns -EBUSY if a stop is needed, else 0
15592b245cb2SAnirudh Venkataramanan */
__ice_maybe_stop_tx(struct ice_tx_ring * tx_ring,unsigned int size)1560e72bba21SMaciej Fijalkowski static int __ice_maybe_stop_tx(struct ice_tx_ring *tx_ring, unsigned int size)
15612b245cb2SAnirudh Venkataramanan {
15621c96c168SJesse Brandeburg netif_tx_stop_queue(txring_txq(tx_ring));
15632b245cb2SAnirudh Venkataramanan /* Memory barrier before checking head and tail */
15642b245cb2SAnirudh Venkataramanan smp_mb();
15652b245cb2SAnirudh Venkataramanan
15662b245cb2SAnirudh Venkataramanan /* Check again in a case another CPU has just made room available. */
15672b245cb2SAnirudh Venkataramanan if (likely(ICE_DESC_UNUSED(tx_ring) < size))
15682b245cb2SAnirudh Venkataramanan return -EBUSY;
15692b245cb2SAnirudh Venkataramanan
15701c96c168SJesse Brandeburg /* A reprieve! - use start_queue because it doesn't call schedule */
15711c96c168SJesse Brandeburg netif_tx_start_queue(txring_txq(tx_ring));
1572288ecf49SBenjamin Mikailenko ++tx_ring->ring_stats->tx_stats.restart_q;
15732b245cb2SAnirudh Venkataramanan return 0;
15742b245cb2SAnirudh Venkataramanan }
15752b245cb2SAnirudh Venkataramanan
15762b245cb2SAnirudh Venkataramanan /**
1577d337f2afSAnirudh Venkataramanan * ice_maybe_stop_tx - 1st level check for Tx stop conditions
15782b245cb2SAnirudh Venkataramanan * @tx_ring: the ring to be checked
15792b245cb2SAnirudh Venkataramanan * @size: the size buffer we want to assure is available
15802b245cb2SAnirudh Venkataramanan *
15812b245cb2SAnirudh Venkataramanan * Returns 0 if stop is not needed
15822b245cb2SAnirudh Venkataramanan */
ice_maybe_stop_tx(struct ice_tx_ring * tx_ring,unsigned int size)1583e72bba21SMaciej Fijalkowski static int ice_maybe_stop_tx(struct ice_tx_ring *tx_ring, unsigned int size)
15842b245cb2SAnirudh Venkataramanan {
15852b245cb2SAnirudh Venkataramanan if (likely(ICE_DESC_UNUSED(tx_ring) >= size))
15862b245cb2SAnirudh Venkataramanan return 0;
1587d337f2afSAnirudh Venkataramanan
15882b245cb2SAnirudh Venkataramanan return __ice_maybe_stop_tx(tx_ring, size);
15892b245cb2SAnirudh Venkataramanan }
15902b245cb2SAnirudh Venkataramanan
15912b245cb2SAnirudh Venkataramanan /**
15922b245cb2SAnirudh Venkataramanan * ice_tx_map - Build the Tx descriptor
15932b245cb2SAnirudh Venkataramanan * @tx_ring: ring to send buffer on
15942b245cb2SAnirudh Venkataramanan * @first: first buffer info buffer to use
1595d76a60baSAnirudh Venkataramanan * @off: pointer to struct that holds offload parameters
15962b245cb2SAnirudh Venkataramanan *
15972b245cb2SAnirudh Venkataramanan * This function loops over the skb data pointed to by *first
15982b245cb2SAnirudh Venkataramanan * and gets a physical address for each memory location and programs
15992b245cb2SAnirudh Venkataramanan * it and the length into the transmit descriptor.
16002b245cb2SAnirudh Venkataramanan */
1601d76a60baSAnirudh Venkataramanan static void
ice_tx_map(struct ice_tx_ring * tx_ring,struct ice_tx_buf * first,struct ice_tx_offload_params * off)1602e72bba21SMaciej Fijalkowski ice_tx_map(struct ice_tx_ring *tx_ring, struct ice_tx_buf *first,
1603d76a60baSAnirudh Venkataramanan struct ice_tx_offload_params *off)
16042b245cb2SAnirudh Venkataramanan {
1605d76a60baSAnirudh Venkataramanan u64 td_offset, td_tag, td_cmd;
16062b245cb2SAnirudh Venkataramanan u16 i = tx_ring->next_to_use;
16072b245cb2SAnirudh Venkataramanan unsigned int data_len, size;
16082b245cb2SAnirudh Venkataramanan struct ice_tx_desc *tx_desc;
16092b245cb2SAnirudh Venkataramanan struct ice_tx_buf *tx_buf;
16102b245cb2SAnirudh Venkataramanan struct sk_buff *skb;
16114ee656bbSTony Nguyen skb_frag_t *frag;
16122b245cb2SAnirudh Venkataramanan dma_addr_t dma;
16139c99d099SJesse Brandeburg bool kick;
16142b245cb2SAnirudh Venkataramanan
1615d76a60baSAnirudh Venkataramanan td_tag = off->td_l2tag1;
1616d76a60baSAnirudh Venkataramanan td_cmd = off->td_cmd;
1617d76a60baSAnirudh Venkataramanan td_offset = off->td_offset;
16182b245cb2SAnirudh Venkataramanan skb = first->skb;
16192b245cb2SAnirudh Venkataramanan
16202b245cb2SAnirudh Venkataramanan data_len = skb->data_len;
16212b245cb2SAnirudh Venkataramanan size = skb_headlen(skb);
16222b245cb2SAnirudh Venkataramanan
16232b245cb2SAnirudh Venkataramanan tx_desc = ICE_TX_DESC(tx_ring, i);
16242b245cb2SAnirudh Venkataramanan
1625d76a60baSAnirudh Venkataramanan if (first->tx_flags & ICE_TX_FLAGS_HW_VLAN) {
1626d76a60baSAnirudh Venkataramanan td_cmd |= (u64)ICE_TX_DESC_CMD_IL2TAG1;
16279113302bSJan Sokolowski td_tag = first->vid;
1628d76a60baSAnirudh Venkataramanan }
1629d76a60baSAnirudh Venkataramanan
16302b245cb2SAnirudh Venkataramanan dma = dma_map_single(tx_ring->dev, skb->data, size, DMA_TO_DEVICE);
16312b245cb2SAnirudh Venkataramanan
16322b245cb2SAnirudh Venkataramanan tx_buf = first;
16332b245cb2SAnirudh Venkataramanan
16342b245cb2SAnirudh Venkataramanan for (frag = &skb_shinfo(skb)->frags[0];; frag++) {
16352b245cb2SAnirudh Venkataramanan unsigned int max_data = ICE_MAX_DATA_PER_TXD_ALIGNED;
16362b245cb2SAnirudh Venkataramanan
16372b245cb2SAnirudh Venkataramanan if (dma_mapping_error(tx_ring->dev, dma))
16382b245cb2SAnirudh Venkataramanan goto dma_error;
16392b245cb2SAnirudh Venkataramanan
16402b245cb2SAnirudh Venkataramanan /* record length, and DMA address */
16412b245cb2SAnirudh Venkataramanan dma_unmap_len_set(tx_buf, len, size);
16422b245cb2SAnirudh Venkataramanan dma_unmap_addr_set(tx_buf, dma, dma);
16432b245cb2SAnirudh Venkataramanan
16442b245cb2SAnirudh Venkataramanan /* align size to end of page */
16452b245cb2SAnirudh Venkataramanan max_data += -dma & (ICE_MAX_READ_REQ_SIZE - 1);
16462b245cb2SAnirudh Venkataramanan tx_desc->buf_addr = cpu_to_le64(dma);
16472b245cb2SAnirudh Venkataramanan
16482b245cb2SAnirudh Venkataramanan /* account for data chunks larger than the hardware
16492b245cb2SAnirudh Venkataramanan * can handle
16502b245cb2SAnirudh Venkataramanan */
16512b245cb2SAnirudh Venkataramanan while (unlikely(size > ICE_MAX_DATA_PER_TXD)) {
16522b245cb2SAnirudh Venkataramanan tx_desc->cmd_type_offset_bsz =
16535757cc7cSTony Nguyen ice_build_ctob(td_cmd, td_offset, max_data,
16545757cc7cSTony Nguyen td_tag);
16552b245cb2SAnirudh Venkataramanan
16562b245cb2SAnirudh Venkataramanan tx_desc++;
16572b245cb2SAnirudh Venkataramanan i++;
16582b245cb2SAnirudh Venkataramanan
16592b245cb2SAnirudh Venkataramanan if (i == tx_ring->count) {
16602b245cb2SAnirudh Venkataramanan tx_desc = ICE_TX_DESC(tx_ring, 0);
16612b245cb2SAnirudh Venkataramanan i = 0;
16622b245cb2SAnirudh Venkataramanan }
16632b245cb2SAnirudh Venkataramanan
16642b245cb2SAnirudh Venkataramanan dma += max_data;
16652b245cb2SAnirudh Venkataramanan size -= max_data;
16662b245cb2SAnirudh Venkataramanan
16672b245cb2SAnirudh Venkataramanan max_data = ICE_MAX_DATA_PER_TXD_ALIGNED;
16682b245cb2SAnirudh Venkataramanan tx_desc->buf_addr = cpu_to_le64(dma);
16692b245cb2SAnirudh Venkataramanan }
16702b245cb2SAnirudh Venkataramanan
16712b245cb2SAnirudh Venkataramanan if (likely(!data_len))
16722b245cb2SAnirudh Venkataramanan break;
16732b245cb2SAnirudh Venkataramanan
16745757cc7cSTony Nguyen tx_desc->cmd_type_offset_bsz = ice_build_ctob(td_cmd, td_offset,
16752b245cb2SAnirudh Venkataramanan size, td_tag);
16762b245cb2SAnirudh Venkataramanan
16772b245cb2SAnirudh Venkataramanan tx_desc++;
16782b245cb2SAnirudh Venkataramanan i++;
16792b245cb2SAnirudh Venkataramanan
16802b245cb2SAnirudh Venkataramanan if (i == tx_ring->count) {
16812b245cb2SAnirudh Venkataramanan tx_desc = ICE_TX_DESC(tx_ring, 0);
16822b245cb2SAnirudh Venkataramanan i = 0;
16832b245cb2SAnirudh Venkataramanan }
16842b245cb2SAnirudh Venkataramanan
16852b245cb2SAnirudh Venkataramanan size = skb_frag_size(frag);
16862b245cb2SAnirudh Venkataramanan data_len -= size;
16872b245cb2SAnirudh Venkataramanan
16882b245cb2SAnirudh Venkataramanan dma = skb_frag_dma_map(tx_ring->dev, frag, 0, size,
16892b245cb2SAnirudh Venkataramanan DMA_TO_DEVICE);
16902b245cb2SAnirudh Venkataramanan
16912b245cb2SAnirudh Venkataramanan tx_buf = &tx_ring->tx_buf[i];
1692aa1d3fafSAlexander Lobakin tx_buf->type = ICE_TX_BUF_FRAG;
16932b245cb2SAnirudh Venkataramanan }
16942b245cb2SAnirudh Venkataramanan
16952b245cb2SAnirudh Venkataramanan /* record SW timestamp if HW timestamp is not available */
16962b245cb2SAnirudh Venkataramanan skb_tx_timestamp(first->skb);
16972b245cb2SAnirudh Venkataramanan
16982b245cb2SAnirudh Venkataramanan i++;
16992b245cb2SAnirudh Venkataramanan if (i == tx_ring->count)
17002b245cb2SAnirudh Venkataramanan i = 0;
17012b245cb2SAnirudh Venkataramanan
17022b245cb2SAnirudh Venkataramanan /* write last descriptor with RS and EOP bits */
1703efc2214bSMaciej Fijalkowski td_cmd |= (u64)ICE_TXD_LAST_DESC_CMD;
17045757cc7cSTony Nguyen tx_desc->cmd_type_offset_bsz =
17055757cc7cSTony Nguyen ice_build_ctob(td_cmd, td_offset, size, td_tag);
17062b245cb2SAnirudh Venkataramanan
17072b245cb2SAnirudh Venkataramanan /* Force memory writes to complete before letting h/w know there
17082b245cb2SAnirudh Venkataramanan * are new descriptors to fetch.
17092b245cb2SAnirudh Venkataramanan *
17102b245cb2SAnirudh Venkataramanan * We also use this memory barrier to make certain all of the
17112b245cb2SAnirudh Venkataramanan * status bits have been updated before next_to_watch is written.
17122b245cb2SAnirudh Venkataramanan */
17132b245cb2SAnirudh Venkataramanan wmb();
17142b245cb2SAnirudh Venkataramanan
17152b245cb2SAnirudh Venkataramanan /* set next_to_watch value indicating a packet is present */
17162b245cb2SAnirudh Venkataramanan first->next_to_watch = tx_desc;
17172b245cb2SAnirudh Venkataramanan
17182b245cb2SAnirudh Venkataramanan tx_ring->next_to_use = i;
17192b245cb2SAnirudh Venkataramanan
17202b245cb2SAnirudh Venkataramanan ice_maybe_stop_tx(tx_ring, DESC_NEEDED);
17212b245cb2SAnirudh Venkataramanan
17222b245cb2SAnirudh Venkataramanan /* notify HW of packet */
17239c99d099SJesse Brandeburg kick = __netdev_tx_sent_queue(txring_txq(tx_ring), first->bytecount,
17249c99d099SJesse Brandeburg netdev_xmit_more());
17259c99d099SJesse Brandeburg if (kick)
17269c99d099SJesse Brandeburg /* notify HW of packet */
17272b245cb2SAnirudh Venkataramanan writel(i, tx_ring->tail);
17282b245cb2SAnirudh Venkataramanan
17292b245cb2SAnirudh Venkataramanan return;
17302b245cb2SAnirudh Venkataramanan
17312b245cb2SAnirudh Venkataramanan dma_error:
17322f2da36eSAnirudh Venkataramanan /* clear DMA mappings for failed tx_buf map */
17332b245cb2SAnirudh Venkataramanan for (;;) {
17342b245cb2SAnirudh Venkataramanan tx_buf = &tx_ring->tx_buf[i];
17352b245cb2SAnirudh Venkataramanan ice_unmap_and_free_tx_buf(tx_ring, tx_buf);
17362b245cb2SAnirudh Venkataramanan if (tx_buf == first)
17372b245cb2SAnirudh Venkataramanan break;
17382b245cb2SAnirudh Venkataramanan if (i == 0)
17392b245cb2SAnirudh Venkataramanan i = tx_ring->count;
17402b245cb2SAnirudh Venkataramanan i--;
17412b245cb2SAnirudh Venkataramanan }
17422b245cb2SAnirudh Venkataramanan
17432b245cb2SAnirudh Venkataramanan tx_ring->next_to_use = i;
17442b245cb2SAnirudh Venkataramanan }
17452b245cb2SAnirudh Venkataramanan
17462b245cb2SAnirudh Venkataramanan /**
1747d76a60baSAnirudh Venkataramanan * ice_tx_csum - Enable Tx checksum offloads
1748d76a60baSAnirudh Venkataramanan * @first: pointer to the first descriptor
1749d76a60baSAnirudh Venkataramanan * @off: pointer to struct that holds offload parameters
1750d76a60baSAnirudh Venkataramanan *
1751d76a60baSAnirudh Venkataramanan * Returns 0 or error (negative) if checksum offload can't happen, 1 otherwise.
1752d76a60baSAnirudh Venkataramanan */
1753d76a60baSAnirudh Venkataramanan static
ice_tx_csum(struct ice_tx_buf * first,struct ice_tx_offload_params * off)1754d76a60baSAnirudh Venkataramanan int ice_tx_csum(struct ice_tx_buf *first, struct ice_tx_offload_params *off)
1755d76a60baSAnirudh Venkataramanan {
1756d76a60baSAnirudh Venkataramanan u32 l4_len = 0, l3_len = 0, l2_len = 0;
1757d76a60baSAnirudh Venkataramanan struct sk_buff *skb = first->skb;
1758d76a60baSAnirudh Venkataramanan union {
1759d76a60baSAnirudh Venkataramanan struct iphdr *v4;
1760d76a60baSAnirudh Venkataramanan struct ipv6hdr *v6;
1761d76a60baSAnirudh Venkataramanan unsigned char *hdr;
1762d76a60baSAnirudh Venkataramanan } ip;
1763d76a60baSAnirudh Venkataramanan union {
1764d76a60baSAnirudh Venkataramanan struct tcphdr *tcp;
1765d76a60baSAnirudh Venkataramanan unsigned char *hdr;
1766d76a60baSAnirudh Venkataramanan } l4;
1767d76a60baSAnirudh Venkataramanan __be16 frag_off, protocol;
1768d76a60baSAnirudh Venkataramanan unsigned char *exthdr;
1769d76a60baSAnirudh Venkataramanan u32 offset, cmd = 0;
1770d76a60baSAnirudh Venkataramanan u8 l4_proto = 0;
1771d76a60baSAnirudh Venkataramanan
1772d76a60baSAnirudh Venkataramanan if (skb->ip_summed != CHECKSUM_PARTIAL)
1773d76a60baSAnirudh Venkataramanan return 0;
1774d76a60baSAnirudh Venkataramanan
177569e66c04SJoe Damato protocol = vlan_get_protocol(skb);
177669e66c04SJoe Damato
177701658aeeSPrzemyslaw Patynowski if (eth_p_mpls(protocol)) {
177869e66c04SJoe Damato ip.hdr = skb_inner_network_header(skb);
177969e66c04SJoe Damato l4.hdr = skb_checksum_start(skb);
178001658aeeSPrzemyslaw Patynowski } else {
178101658aeeSPrzemyslaw Patynowski ip.hdr = skb_network_header(skb);
178201658aeeSPrzemyslaw Patynowski l4.hdr = skb_transport_header(skb);
178301658aeeSPrzemyslaw Patynowski }
1784d76a60baSAnirudh Venkataramanan
1785d76a60baSAnirudh Venkataramanan /* compute outer L2 header size */
1786d76a60baSAnirudh Venkataramanan l2_len = ip.hdr - skb->data;
1787d76a60baSAnirudh Venkataramanan offset = (l2_len / 2) << ICE_TX_DESC_LEN_MACLEN_S;
1788d76a60baSAnirudh Venkataramanan
178969e66c04SJoe Damato /* set the tx_flags to indicate the IP protocol type. this is
179069e66c04SJoe Damato * required so that checksum header computation below is accurate.
179169e66c04SJoe Damato */
179269e66c04SJoe Damato if (ip.v4->version == 4)
1793a4e82a81STony Nguyen first->tx_flags |= ICE_TX_FLAGS_IPV4;
179469e66c04SJoe Damato else if (ip.v6->version == 6)
1795a4e82a81STony Nguyen first->tx_flags |= ICE_TX_FLAGS_IPV6;
1796a4e82a81STony Nguyen
1797a4e82a81STony Nguyen if (skb->encapsulation) {
1798a4e82a81STony Nguyen bool gso_ena = false;
1799a4e82a81STony Nguyen u32 tunnel = 0;
1800a4e82a81STony Nguyen
1801a4e82a81STony Nguyen /* define outer network header type */
1802a4e82a81STony Nguyen if (first->tx_flags & ICE_TX_FLAGS_IPV4) {
1803a4e82a81STony Nguyen tunnel |= (first->tx_flags & ICE_TX_FLAGS_TSO) ?
1804a4e82a81STony Nguyen ICE_TX_CTX_EIPT_IPV4 :
1805a4e82a81STony Nguyen ICE_TX_CTX_EIPT_IPV4_NO_CSUM;
1806a4e82a81STony Nguyen l4_proto = ip.v4->protocol;
1807a4e82a81STony Nguyen } else if (first->tx_flags & ICE_TX_FLAGS_IPV6) {
18081b0b0b58SNick Nunley int ret;
18091b0b0b58SNick Nunley
1810a4e82a81STony Nguyen tunnel |= ICE_TX_CTX_EIPT_IPV6;
1811a4e82a81STony Nguyen exthdr = ip.hdr + sizeof(*ip.v6);
1812a4e82a81STony Nguyen l4_proto = ip.v6->nexthdr;
18131b0b0b58SNick Nunley ret = ipv6_skip_exthdr(skb, exthdr - skb->data,
1814a4e82a81STony Nguyen &l4_proto, &frag_off);
18151b0b0b58SNick Nunley if (ret < 0)
18161b0b0b58SNick Nunley return -1;
1817a4e82a81STony Nguyen }
1818a4e82a81STony Nguyen
1819a4e82a81STony Nguyen /* define outer transport */
1820a4e82a81STony Nguyen switch (l4_proto) {
1821a4e82a81STony Nguyen case IPPROTO_UDP:
1822a4e82a81STony Nguyen tunnel |= ICE_TXD_CTX_UDP_TUNNELING;
1823a4e82a81STony Nguyen first->tx_flags |= ICE_TX_FLAGS_TUNNEL;
1824a4e82a81STony Nguyen break;
1825a4e82a81STony Nguyen case IPPROTO_GRE:
1826a4e82a81STony Nguyen tunnel |= ICE_TXD_CTX_GRE_TUNNELING;
1827a4e82a81STony Nguyen first->tx_flags |= ICE_TX_FLAGS_TUNNEL;
1828a4e82a81STony Nguyen break;
1829a4e82a81STony Nguyen case IPPROTO_IPIP:
1830a4e82a81STony Nguyen case IPPROTO_IPV6:
1831a4e82a81STony Nguyen first->tx_flags |= ICE_TX_FLAGS_TUNNEL;
1832a4e82a81STony Nguyen l4.hdr = skb_inner_network_header(skb);
1833a4e82a81STony Nguyen break;
1834a4e82a81STony Nguyen default:
1835a4e82a81STony Nguyen if (first->tx_flags & ICE_TX_FLAGS_TSO)
1836d76a60baSAnirudh Venkataramanan return -1;
1837d76a60baSAnirudh Venkataramanan
1838a4e82a81STony Nguyen skb_checksum_help(skb);
1839a4e82a81STony Nguyen return 0;
1840a4e82a81STony Nguyen }
1841a4e82a81STony Nguyen
1842a4e82a81STony Nguyen /* compute outer L3 header size */
1843a4e82a81STony Nguyen tunnel |= ((l4.hdr - ip.hdr) / 4) <<
1844a4e82a81STony Nguyen ICE_TXD_CTX_QW0_EIPLEN_S;
1845a4e82a81STony Nguyen
1846a4e82a81STony Nguyen /* switch IP header pointer from outer to inner header */
1847a4e82a81STony Nguyen ip.hdr = skb_inner_network_header(skb);
1848a4e82a81STony Nguyen
1849a4e82a81STony Nguyen /* compute tunnel header size */
1850a4e82a81STony Nguyen tunnel |= ((ip.hdr - l4.hdr) / 2) <<
1851a4e82a81STony Nguyen ICE_TXD_CTX_QW0_NATLEN_S;
1852a4e82a81STony Nguyen
1853a4e82a81STony Nguyen gso_ena = skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL;
1854a4e82a81STony Nguyen /* indicate if we need to offload outer UDP header */
1855a4e82a81STony Nguyen if ((first->tx_flags & ICE_TX_FLAGS_TSO) && !gso_ena &&
1856a4e82a81STony Nguyen (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM))
1857a4e82a81STony Nguyen tunnel |= ICE_TXD_CTX_QW0_L4T_CS_M;
1858a4e82a81STony Nguyen
1859a4e82a81STony Nguyen /* record tunnel offload values */
1860a4e82a81STony Nguyen off->cd_tunnel_params |= tunnel;
1861a4e82a81STony Nguyen
1862a4e82a81STony Nguyen /* set DTYP=1 to indicate that it's an Tx context descriptor
1863a4e82a81STony Nguyen * in IPsec tunnel mode with Tx offloads in Quad word 1
1864a4e82a81STony Nguyen */
1865a4e82a81STony Nguyen off->cd_qw1 |= (u64)ICE_TX_DESC_DTYPE_CTX;
1866a4e82a81STony Nguyen
1867a4e82a81STony Nguyen /* switch L4 header pointer from outer to inner */
1868a4e82a81STony Nguyen l4.hdr = skb_inner_transport_header(skb);
1869a4e82a81STony Nguyen l4_proto = 0;
1870a4e82a81STony Nguyen
1871a4e82a81STony Nguyen /* reset type as we transition from outer to inner headers */
1872a4e82a81STony Nguyen first->tx_flags &= ~(ICE_TX_FLAGS_IPV4 | ICE_TX_FLAGS_IPV6);
1873a4e82a81STony Nguyen if (ip.v4->version == 4)
1874a4e82a81STony Nguyen first->tx_flags |= ICE_TX_FLAGS_IPV4;
1875a4e82a81STony Nguyen if (ip.v6->version == 6)
1876a4e82a81STony Nguyen first->tx_flags |= ICE_TX_FLAGS_IPV6;
1877a4e82a81STony Nguyen }
1878a4e82a81STony Nguyen
1879d76a60baSAnirudh Venkataramanan /* Enable IP checksum offloads */
1880a4e82a81STony Nguyen if (first->tx_flags & ICE_TX_FLAGS_IPV4) {
1881d76a60baSAnirudh Venkataramanan l4_proto = ip.v4->protocol;
1882d76a60baSAnirudh Venkataramanan /* the stack computes the IP header already, the only time we
1883d76a60baSAnirudh Venkataramanan * need the hardware to recompute it is in the case of TSO.
1884d76a60baSAnirudh Venkataramanan */
1885d76a60baSAnirudh Venkataramanan if (first->tx_flags & ICE_TX_FLAGS_TSO)
1886d76a60baSAnirudh Venkataramanan cmd |= ICE_TX_DESC_CMD_IIPT_IPV4_CSUM;
1887d76a60baSAnirudh Venkataramanan else
1888d76a60baSAnirudh Venkataramanan cmd |= ICE_TX_DESC_CMD_IIPT_IPV4;
1889d76a60baSAnirudh Venkataramanan
1890a4e82a81STony Nguyen } else if (first->tx_flags & ICE_TX_FLAGS_IPV6) {
1891d76a60baSAnirudh Venkataramanan cmd |= ICE_TX_DESC_CMD_IIPT_IPV6;
1892d76a60baSAnirudh Venkataramanan exthdr = ip.hdr + sizeof(*ip.v6);
1893d76a60baSAnirudh Venkataramanan l4_proto = ip.v6->nexthdr;
1894d76a60baSAnirudh Venkataramanan if (l4.hdr != exthdr)
1895d76a60baSAnirudh Venkataramanan ipv6_skip_exthdr(skb, exthdr - skb->data, &l4_proto,
1896d76a60baSAnirudh Venkataramanan &frag_off);
1897d76a60baSAnirudh Venkataramanan } else {
1898d76a60baSAnirudh Venkataramanan return -1;
1899d76a60baSAnirudh Venkataramanan }
1900d76a60baSAnirudh Venkataramanan
1901d76a60baSAnirudh Venkataramanan /* compute inner L3 header size */
1902d76a60baSAnirudh Venkataramanan l3_len = l4.hdr - ip.hdr;
1903d76a60baSAnirudh Venkataramanan offset |= (l3_len / 4) << ICE_TX_DESC_LEN_IPLEN_S;
1904d76a60baSAnirudh Venkataramanan
1905d76a60baSAnirudh Venkataramanan /* Enable L4 checksum offloads */
1906d76a60baSAnirudh Venkataramanan switch (l4_proto) {
1907d76a60baSAnirudh Venkataramanan case IPPROTO_TCP:
1908d76a60baSAnirudh Venkataramanan /* enable checksum offloads */
1909d76a60baSAnirudh Venkataramanan cmd |= ICE_TX_DESC_CMD_L4T_EOFT_TCP;
1910d76a60baSAnirudh Venkataramanan l4_len = l4.tcp->doff;
1911d76a60baSAnirudh Venkataramanan offset |= l4_len << ICE_TX_DESC_LEN_L4_LEN_S;
1912d76a60baSAnirudh Venkataramanan break;
1913d76a60baSAnirudh Venkataramanan case IPPROTO_UDP:
1914d76a60baSAnirudh Venkataramanan /* enable UDP checksum offload */
1915d76a60baSAnirudh Venkataramanan cmd |= ICE_TX_DESC_CMD_L4T_EOFT_UDP;
1916d76a60baSAnirudh Venkataramanan l4_len = (sizeof(struct udphdr) >> 2);
1917d76a60baSAnirudh Venkataramanan offset |= l4_len << ICE_TX_DESC_LEN_L4_LEN_S;
1918d76a60baSAnirudh Venkataramanan break;
1919d76a60baSAnirudh Venkataramanan case IPPROTO_SCTP:
1920cf909e19SAnirudh Venkataramanan /* enable SCTP checksum offload */
1921cf909e19SAnirudh Venkataramanan cmd |= ICE_TX_DESC_CMD_L4T_EOFT_SCTP;
1922cf909e19SAnirudh Venkataramanan l4_len = sizeof(struct sctphdr) >> 2;
1923cf909e19SAnirudh Venkataramanan offset |= l4_len << ICE_TX_DESC_LEN_L4_LEN_S;
1924cf909e19SAnirudh Venkataramanan break;
1925cf909e19SAnirudh Venkataramanan
1926d76a60baSAnirudh Venkataramanan default:
1927d76a60baSAnirudh Venkataramanan if (first->tx_flags & ICE_TX_FLAGS_TSO)
1928d76a60baSAnirudh Venkataramanan return -1;
1929d76a60baSAnirudh Venkataramanan skb_checksum_help(skb);
1930d76a60baSAnirudh Venkataramanan return 0;
1931d76a60baSAnirudh Venkataramanan }
1932d76a60baSAnirudh Venkataramanan
1933d76a60baSAnirudh Venkataramanan off->td_cmd |= cmd;
1934d76a60baSAnirudh Venkataramanan off->td_offset |= offset;
1935d76a60baSAnirudh Venkataramanan return 1;
1936d76a60baSAnirudh Venkataramanan }
1937d76a60baSAnirudh Venkataramanan
1938d76a60baSAnirudh Venkataramanan /**
1939f9867df6SAnirudh Venkataramanan * ice_tx_prepare_vlan_flags - prepare generic Tx VLAN tagging flags for HW
1940d76a60baSAnirudh Venkataramanan * @tx_ring: ring to send buffer on
1941d76a60baSAnirudh Venkataramanan * @first: pointer to struct ice_tx_buf
1942d76a60baSAnirudh Venkataramanan *
1943d76a60baSAnirudh Venkataramanan * Checks the skb and set up correspondingly several generic transmit flags
1944d76a60baSAnirudh Venkataramanan * related to VLAN tagging for the HW, such as VLAN, DCB, etc.
1945d76a60baSAnirudh Venkataramanan */
19462bb19d6eSBrett Creeley static void
ice_tx_prepare_vlan_flags(struct ice_tx_ring * tx_ring,struct ice_tx_buf * first)1947e72bba21SMaciej Fijalkowski ice_tx_prepare_vlan_flags(struct ice_tx_ring *tx_ring, struct ice_tx_buf *first)
1948d76a60baSAnirudh Venkataramanan {
1949d76a60baSAnirudh Venkataramanan struct sk_buff *skb = first->skb;
1950d76a60baSAnirudh Venkataramanan
19512bb19d6eSBrett Creeley /* nothing left to do, software offloaded VLAN */
19522bb19d6eSBrett Creeley if (!skb_vlan_tag_present(skb) && eth_type_vlan(skb->protocol))
19532bb19d6eSBrett Creeley return;
19542bb19d6eSBrett Creeley
19550d54d8f7SBrett Creeley /* the VLAN ethertype/tpid is determined by VSI configuration and netdev
19560d54d8f7SBrett Creeley * feature flags, which the driver only allows either 802.1Q or 802.1ad
19570d54d8f7SBrett Creeley * VLAN offloads exclusively so we only care about the VLAN ID here
1958d76a60baSAnirudh Venkataramanan */
1959d76a60baSAnirudh Venkataramanan if (skb_vlan_tag_present(skb)) {
19609113302bSJan Sokolowski first->vid = skb_vlan_tag_get(skb);
19610d54d8f7SBrett Creeley if (tx_ring->flags & ICE_TX_FLAGS_RING_VLAN_L2TAG2)
19620d54d8f7SBrett Creeley first->tx_flags |= ICE_TX_FLAGS_HW_OUTER_SINGLE_VLAN;
19630d54d8f7SBrett Creeley else
1964d76a60baSAnirudh Venkataramanan first->tx_flags |= ICE_TX_FLAGS_HW_VLAN;
1965d76a60baSAnirudh Venkataramanan }
1966d76a60baSAnirudh Venkataramanan
19672bb19d6eSBrett Creeley ice_tx_prepare_vlan_flags_dcb(tx_ring, first);
1968d76a60baSAnirudh Venkataramanan }
1969d76a60baSAnirudh Venkataramanan
1970d76a60baSAnirudh Venkataramanan /**
1971d76a60baSAnirudh Venkataramanan * ice_tso - computes mss and TSO length to prepare for TSO
1972d76a60baSAnirudh Venkataramanan * @first: pointer to struct ice_tx_buf
1973d76a60baSAnirudh Venkataramanan * @off: pointer to struct that holds offload parameters
1974d76a60baSAnirudh Venkataramanan *
1975d76a60baSAnirudh Venkataramanan * Returns 0 or error (negative) if TSO can't happen, 1 otherwise.
1976d76a60baSAnirudh Venkataramanan */
1977d76a60baSAnirudh Venkataramanan static
ice_tso(struct ice_tx_buf * first,struct ice_tx_offload_params * off)1978d76a60baSAnirudh Venkataramanan int ice_tso(struct ice_tx_buf *first, struct ice_tx_offload_params *off)
1979d76a60baSAnirudh Venkataramanan {
1980d76a60baSAnirudh Venkataramanan struct sk_buff *skb = first->skb;
1981d76a60baSAnirudh Venkataramanan union {
1982d76a60baSAnirudh Venkataramanan struct iphdr *v4;
1983d76a60baSAnirudh Venkataramanan struct ipv6hdr *v6;
1984d76a60baSAnirudh Venkataramanan unsigned char *hdr;
1985d76a60baSAnirudh Venkataramanan } ip;
1986d76a60baSAnirudh Venkataramanan union {
1987d76a60baSAnirudh Venkataramanan struct tcphdr *tcp;
1988a54e3b8cSBrett Creeley struct udphdr *udp;
1989d76a60baSAnirudh Venkataramanan unsigned char *hdr;
1990d76a60baSAnirudh Venkataramanan } l4;
1991d76a60baSAnirudh Venkataramanan u64 cd_mss, cd_tso_len;
199269e66c04SJoe Damato __be16 protocol;
199388865fc4SKarol Kolacinski u32 paylen;
199488865fc4SKarol Kolacinski u8 l4_start;
1995d76a60baSAnirudh Venkataramanan int err;
1996d76a60baSAnirudh Venkataramanan
1997d76a60baSAnirudh Venkataramanan if (skb->ip_summed != CHECKSUM_PARTIAL)
1998d76a60baSAnirudh Venkataramanan return 0;
1999d76a60baSAnirudh Venkataramanan
2000d76a60baSAnirudh Venkataramanan if (!skb_is_gso(skb))
2001d76a60baSAnirudh Venkataramanan return 0;
2002d76a60baSAnirudh Venkataramanan
2003d76a60baSAnirudh Venkataramanan err = skb_cow_head(skb, 0);
2004d76a60baSAnirudh Venkataramanan if (err < 0)
2005d76a60baSAnirudh Venkataramanan return err;
2006d76a60baSAnirudh Venkataramanan
200769e66c04SJoe Damato protocol = vlan_get_protocol(skb);
200869e66c04SJoe Damato
200969e66c04SJoe Damato if (eth_p_mpls(protocol))
201069e66c04SJoe Damato ip.hdr = skb_inner_network_header(skb);
201169e66c04SJoe Damato else
2012d76a60baSAnirudh Venkataramanan ip.hdr = skb_network_header(skb);
201369e66c04SJoe Damato l4.hdr = skb_checksum_start(skb);
2014d76a60baSAnirudh Venkataramanan
2015d76a60baSAnirudh Venkataramanan /* initialize outer IP header fields */
2016d76a60baSAnirudh Venkataramanan if (ip.v4->version == 4) {
2017d76a60baSAnirudh Venkataramanan ip.v4->tot_len = 0;
2018d76a60baSAnirudh Venkataramanan ip.v4->check = 0;
2019d76a60baSAnirudh Venkataramanan } else {
2020d76a60baSAnirudh Venkataramanan ip.v6->payload_len = 0;
2021d76a60baSAnirudh Venkataramanan }
2022d76a60baSAnirudh Venkataramanan
2023a4e82a81STony Nguyen if (skb_shinfo(skb)->gso_type & (SKB_GSO_GRE |
2024a4e82a81STony Nguyen SKB_GSO_GRE_CSUM |
2025a4e82a81STony Nguyen SKB_GSO_IPXIP4 |
2026a4e82a81STony Nguyen SKB_GSO_IPXIP6 |
2027a4e82a81STony Nguyen SKB_GSO_UDP_TUNNEL |
2028a4e82a81STony Nguyen SKB_GSO_UDP_TUNNEL_CSUM)) {
2029a4e82a81STony Nguyen if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) &&
2030a4e82a81STony Nguyen (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM)) {
2031a4e82a81STony Nguyen l4.udp->len = 0;
2032a4e82a81STony Nguyen
2033a4e82a81STony Nguyen /* determine offset of outer transport header */
203488865fc4SKarol Kolacinski l4_start = (u8)(l4.hdr - skb->data);
2035a4e82a81STony Nguyen
2036a4e82a81STony Nguyen /* remove payload length from outer checksum */
2037a4e82a81STony Nguyen paylen = skb->len - l4_start;
2038a4e82a81STony Nguyen csum_replace_by_diff(&l4.udp->check,
2039a4e82a81STony Nguyen (__force __wsum)htonl(paylen));
2040a4e82a81STony Nguyen }
2041a4e82a81STony Nguyen
2042a4e82a81STony Nguyen /* reset pointers to inner headers */
2043a4e82a81STony Nguyen ip.hdr = skb_inner_network_header(skb);
2044a4e82a81STony Nguyen l4.hdr = skb_inner_transport_header(skb);
2045a4e82a81STony Nguyen
2046a4e82a81STony Nguyen /* initialize inner IP header fields */
2047a4e82a81STony Nguyen if (ip.v4->version == 4) {
2048a4e82a81STony Nguyen ip.v4->tot_len = 0;
2049a4e82a81STony Nguyen ip.v4->check = 0;
2050a4e82a81STony Nguyen } else {
2051a4e82a81STony Nguyen ip.v6->payload_len = 0;
2052a4e82a81STony Nguyen }
2053a4e82a81STony Nguyen }
2054a4e82a81STony Nguyen
2055d76a60baSAnirudh Venkataramanan /* determine offset of transport header */
205688865fc4SKarol Kolacinski l4_start = (u8)(l4.hdr - skb->data);
2057d76a60baSAnirudh Venkataramanan
2058d76a60baSAnirudh Venkataramanan /* remove payload length from checksum */
2059d76a60baSAnirudh Venkataramanan paylen = skb->len - l4_start;
2060d76a60baSAnirudh Venkataramanan
2061a54e3b8cSBrett Creeley if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) {
2062a54e3b8cSBrett Creeley csum_replace_by_diff(&l4.udp->check,
2063a54e3b8cSBrett Creeley (__force __wsum)htonl(paylen));
2064a54e3b8cSBrett Creeley /* compute length of UDP segmentation header */
206588865fc4SKarol Kolacinski off->header_len = (u8)sizeof(l4.udp) + l4_start;
2066a54e3b8cSBrett Creeley } else {
2067a54e3b8cSBrett Creeley csum_replace_by_diff(&l4.tcp->check,
2068a54e3b8cSBrett Creeley (__force __wsum)htonl(paylen));
2069a54e3b8cSBrett Creeley /* compute length of TCP segmentation header */
207088865fc4SKarol Kolacinski off->header_len = (u8)((l4.tcp->doff * 4) + l4_start);
2071a54e3b8cSBrett Creeley }
2072d76a60baSAnirudh Venkataramanan
2073d76a60baSAnirudh Venkataramanan /* update gso_segs and bytecount */
2074d76a60baSAnirudh Venkataramanan first->gso_segs = skb_shinfo(skb)->gso_segs;
2075d944b469SBrett Creeley first->bytecount += (first->gso_segs - 1) * off->header_len;
2076d76a60baSAnirudh Venkataramanan
2077d76a60baSAnirudh Venkataramanan cd_tso_len = skb->len - off->header_len;
2078d76a60baSAnirudh Venkataramanan cd_mss = skb_shinfo(skb)->gso_size;
2079d76a60baSAnirudh Venkataramanan
2080d76a60baSAnirudh Venkataramanan /* record cdesc_qw1 with TSO parameters */
2081e65e9e15SBruce Allan off->cd_qw1 |= (u64)(ICE_TX_DESC_DTYPE_CTX |
2082d76a60baSAnirudh Venkataramanan (ICE_TX_CTX_DESC_TSO << ICE_TXD_CTX_QW1_CMD_S) |
2083d76a60baSAnirudh Venkataramanan (cd_tso_len << ICE_TXD_CTX_QW1_TSO_LEN_S) |
2084e65e9e15SBruce Allan (cd_mss << ICE_TXD_CTX_QW1_MSS_S));
2085d76a60baSAnirudh Venkataramanan first->tx_flags |= ICE_TX_FLAGS_TSO;
2086d76a60baSAnirudh Venkataramanan return 1;
2087d76a60baSAnirudh Venkataramanan }
2088d76a60baSAnirudh Venkataramanan
2089d76a60baSAnirudh Venkataramanan /**
20902b245cb2SAnirudh Venkataramanan * ice_txd_use_count - estimate the number of descriptors needed for Tx
20912b245cb2SAnirudh Venkataramanan * @size: transmit request size in bytes
20922b245cb2SAnirudh Venkataramanan *
20932b245cb2SAnirudh Venkataramanan * Due to hardware alignment restrictions (4K alignment), we need to
20942b245cb2SAnirudh Venkataramanan * assume that we can have no more than 12K of data per descriptor, even
20952b245cb2SAnirudh Venkataramanan * though each descriptor can take up to 16K - 1 bytes of aligned memory.
20962b245cb2SAnirudh Venkataramanan * Thus, we need to divide by 12K. But division is slow! Instead,
20972b245cb2SAnirudh Venkataramanan * we decompose the operation into shifts and one relatively cheap
20982b245cb2SAnirudh Venkataramanan * multiply operation.
20992b245cb2SAnirudh Venkataramanan *
21002b245cb2SAnirudh Venkataramanan * To divide by 12K, we first divide by 4K, then divide by 3:
21012b245cb2SAnirudh Venkataramanan * To divide by 4K, shift right by 12 bits
21022b245cb2SAnirudh Venkataramanan * To divide by 3, multiply by 85, then divide by 256
21032b245cb2SAnirudh Venkataramanan * (Divide by 256 is done by shifting right by 8 bits)
21042b245cb2SAnirudh Venkataramanan * Finally, we add one to round up. Because 256 isn't an exact multiple of
21052b245cb2SAnirudh Venkataramanan * 3, we'll underestimate near each multiple of 12K. This is actually more
21062b245cb2SAnirudh Venkataramanan * accurate as we have 4K - 1 of wiggle room that we can fit into the last
21072b245cb2SAnirudh Venkataramanan * segment. For our purposes this is accurate out to 1M which is orders of
21082b245cb2SAnirudh Venkataramanan * magnitude greater than our largest possible GSO size.
21092b245cb2SAnirudh Venkataramanan *
21102b245cb2SAnirudh Venkataramanan * This would then be implemented as:
2111c585ea42SBrett Creeley * return (((size >> 12) * 85) >> 8) + ICE_DESCS_FOR_SKB_DATA_PTR;
21122b245cb2SAnirudh Venkataramanan *
21132b245cb2SAnirudh Venkataramanan * Since multiplication and division are commutative, we can reorder
21142b245cb2SAnirudh Venkataramanan * operations into:
2115c585ea42SBrett Creeley * return ((size * 85) >> 20) + ICE_DESCS_FOR_SKB_DATA_PTR;
21162b245cb2SAnirudh Venkataramanan */
ice_txd_use_count(unsigned int size)21172b245cb2SAnirudh Venkataramanan static unsigned int ice_txd_use_count(unsigned int size)
21182b245cb2SAnirudh Venkataramanan {
2119c585ea42SBrett Creeley return ((size * 85) >> 20) + ICE_DESCS_FOR_SKB_DATA_PTR;
21202b245cb2SAnirudh Venkataramanan }
21212b245cb2SAnirudh Venkataramanan
21222b245cb2SAnirudh Venkataramanan /**
2123d337f2afSAnirudh Venkataramanan * ice_xmit_desc_count - calculate number of Tx descriptors needed
21242b245cb2SAnirudh Venkataramanan * @skb: send buffer
21252b245cb2SAnirudh Venkataramanan *
21262b245cb2SAnirudh Venkataramanan * Returns number of data descriptors needed for this skb.
21272b245cb2SAnirudh Venkataramanan */
ice_xmit_desc_count(struct sk_buff * skb)21282b245cb2SAnirudh Venkataramanan static unsigned int ice_xmit_desc_count(struct sk_buff *skb)
21292b245cb2SAnirudh Venkataramanan {
2130d7840976SMatthew Wilcox (Oracle) const skb_frag_t *frag = &skb_shinfo(skb)->frags[0];
21312b245cb2SAnirudh Venkataramanan unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
21322b245cb2SAnirudh Venkataramanan unsigned int count = 0, size = skb_headlen(skb);
21332b245cb2SAnirudh Venkataramanan
21342b245cb2SAnirudh Venkataramanan for (;;) {
21352b245cb2SAnirudh Venkataramanan count += ice_txd_use_count(size);
21362b245cb2SAnirudh Venkataramanan
21372b245cb2SAnirudh Venkataramanan if (!nr_frags--)
21382b245cb2SAnirudh Venkataramanan break;
21392b245cb2SAnirudh Venkataramanan
21402b245cb2SAnirudh Venkataramanan size = skb_frag_size(frag++);
21412b245cb2SAnirudh Venkataramanan }
21422b245cb2SAnirudh Venkataramanan
21432b245cb2SAnirudh Venkataramanan return count;
21442b245cb2SAnirudh Venkataramanan }
21452b245cb2SAnirudh Venkataramanan
21462b245cb2SAnirudh Venkataramanan /**
21472b245cb2SAnirudh Venkataramanan * __ice_chk_linearize - Check if there are more than 8 buffers per packet
21482b245cb2SAnirudh Venkataramanan * @skb: send buffer
21492b245cb2SAnirudh Venkataramanan *
21502b245cb2SAnirudh Venkataramanan * Note: This HW can't DMA more than 8 buffers to build a packet on the wire
21512b245cb2SAnirudh Venkataramanan * and so we need to figure out the cases where we need to linearize the skb.
21522b245cb2SAnirudh Venkataramanan *
21532b245cb2SAnirudh Venkataramanan * For TSO we need to count the TSO header and segment payload separately.
21542b245cb2SAnirudh Venkataramanan * As such we need to check cases where we have 7 fragments or more as we
21552b245cb2SAnirudh Venkataramanan * can potentially require 9 DMA transactions, 1 for the TSO header, 1 for
21562b245cb2SAnirudh Venkataramanan * the segment payload in the first descriptor, and another 7 for the
21572b245cb2SAnirudh Venkataramanan * fragments.
21582b245cb2SAnirudh Venkataramanan */
__ice_chk_linearize(struct sk_buff * skb)21592b245cb2SAnirudh Venkataramanan static bool __ice_chk_linearize(struct sk_buff *skb)
21602b245cb2SAnirudh Venkataramanan {
2161d7840976SMatthew Wilcox (Oracle) const skb_frag_t *frag, *stale;
21622b245cb2SAnirudh Venkataramanan int nr_frags, sum;
21632b245cb2SAnirudh Venkataramanan
21642b245cb2SAnirudh Venkataramanan /* no need to check if number of frags is less than 7 */
21652b245cb2SAnirudh Venkataramanan nr_frags = skb_shinfo(skb)->nr_frags;
21662b245cb2SAnirudh Venkataramanan if (nr_frags < (ICE_MAX_BUF_TXD - 1))
21672b245cb2SAnirudh Venkataramanan return false;
21682b245cb2SAnirudh Venkataramanan
21692b245cb2SAnirudh Venkataramanan /* We need to walk through the list and validate that each group
21702b245cb2SAnirudh Venkataramanan * of 6 fragments totals at least gso_size.
21712b245cb2SAnirudh Venkataramanan */
21722b245cb2SAnirudh Venkataramanan nr_frags -= ICE_MAX_BUF_TXD - 2;
21732b245cb2SAnirudh Venkataramanan frag = &skb_shinfo(skb)->frags[0];
21742b245cb2SAnirudh Venkataramanan
21752b245cb2SAnirudh Venkataramanan /* Initialize size to the negative value of gso_size minus 1. We
21764ee656bbSTony Nguyen * use this as the worst case scenario in which the frag ahead
21772b245cb2SAnirudh Venkataramanan * of us only provides one byte which is why we are limited to 6
21782b245cb2SAnirudh Venkataramanan * descriptors for a single transmit as the header and previous
21792b245cb2SAnirudh Venkataramanan * fragment are already consuming 2 descriptors.
21802b245cb2SAnirudh Venkataramanan */
21812b245cb2SAnirudh Venkataramanan sum = 1 - skb_shinfo(skb)->gso_size;
21822b245cb2SAnirudh Venkataramanan
21832b245cb2SAnirudh Venkataramanan /* Add size of frags 0 through 4 to create our initial sum */
21842b245cb2SAnirudh Venkataramanan sum += skb_frag_size(frag++);
21852b245cb2SAnirudh Venkataramanan sum += skb_frag_size(frag++);
21862b245cb2SAnirudh Venkataramanan sum += skb_frag_size(frag++);
21872b245cb2SAnirudh Venkataramanan sum += skb_frag_size(frag++);
21882b245cb2SAnirudh Venkataramanan sum += skb_frag_size(frag++);
21892b245cb2SAnirudh Venkataramanan
21902b245cb2SAnirudh Venkataramanan /* Walk through fragments adding latest fragment, testing it, and
21912b245cb2SAnirudh Venkataramanan * then removing stale fragments from the sum.
21922b245cb2SAnirudh Venkataramanan */
21930a37abfaSKiran Patil for (stale = &skb_shinfo(skb)->frags[0];; stale++) {
21940a37abfaSKiran Patil int stale_size = skb_frag_size(stale);
21950a37abfaSKiran Patil
21962b245cb2SAnirudh Venkataramanan sum += skb_frag_size(frag++);
21972b245cb2SAnirudh Venkataramanan
21980a37abfaSKiran Patil /* The stale fragment may present us with a smaller
21990a37abfaSKiran Patil * descriptor than the actual fragment size. To account
22000a37abfaSKiran Patil * for that we need to remove all the data on the front and
22010a37abfaSKiran Patil * figure out what the remainder would be in the last
22020a37abfaSKiran Patil * descriptor associated with the fragment.
22030a37abfaSKiran Patil */
22040a37abfaSKiran Patil if (stale_size > ICE_MAX_DATA_PER_TXD) {
22050a37abfaSKiran Patil int align_pad = -(skb_frag_off(stale)) &
22060a37abfaSKiran Patil (ICE_MAX_READ_REQ_SIZE - 1);
22070a37abfaSKiran Patil
22080a37abfaSKiran Patil sum -= align_pad;
22090a37abfaSKiran Patil stale_size -= align_pad;
22100a37abfaSKiran Patil
22110a37abfaSKiran Patil do {
22120a37abfaSKiran Patil sum -= ICE_MAX_DATA_PER_TXD_ALIGNED;
22130a37abfaSKiran Patil stale_size -= ICE_MAX_DATA_PER_TXD_ALIGNED;
22140a37abfaSKiran Patil } while (stale_size > ICE_MAX_DATA_PER_TXD);
22150a37abfaSKiran Patil }
22160a37abfaSKiran Patil
22172b245cb2SAnirudh Venkataramanan /* if sum is negative we failed to make sufficient progress */
22182b245cb2SAnirudh Venkataramanan if (sum < 0)
22192b245cb2SAnirudh Venkataramanan return true;
22202b245cb2SAnirudh Venkataramanan
22212b245cb2SAnirudh Venkataramanan if (!nr_frags--)
22222b245cb2SAnirudh Venkataramanan break;
22232b245cb2SAnirudh Venkataramanan
22240a37abfaSKiran Patil sum -= stale_size;
22252b245cb2SAnirudh Venkataramanan }
22262b245cb2SAnirudh Venkataramanan
22272b245cb2SAnirudh Venkataramanan return false;
22282b245cb2SAnirudh Venkataramanan }
22292b245cb2SAnirudh Venkataramanan
22302b245cb2SAnirudh Venkataramanan /**
22312b245cb2SAnirudh Venkataramanan * ice_chk_linearize - Check if there are more than 8 fragments per packet
22322b245cb2SAnirudh Venkataramanan * @skb: send buffer
22332b245cb2SAnirudh Venkataramanan * @count: number of buffers used
22342b245cb2SAnirudh Venkataramanan *
22352b245cb2SAnirudh Venkataramanan * Note: Our HW can't scatter-gather more than 8 fragments to build
22362b245cb2SAnirudh Venkataramanan * a packet on the wire and so we need to figure out the cases where we
22372b245cb2SAnirudh Venkataramanan * need to linearize the skb.
22382b245cb2SAnirudh Venkataramanan */
ice_chk_linearize(struct sk_buff * skb,unsigned int count)22392b245cb2SAnirudh Venkataramanan static bool ice_chk_linearize(struct sk_buff *skb, unsigned int count)
22402b245cb2SAnirudh Venkataramanan {
22412b245cb2SAnirudh Venkataramanan /* Both TSO and single send will work if count is less than 8 */
22422b245cb2SAnirudh Venkataramanan if (likely(count < ICE_MAX_BUF_TXD))
22432b245cb2SAnirudh Venkataramanan return false;
22442b245cb2SAnirudh Venkataramanan
22452b245cb2SAnirudh Venkataramanan if (skb_is_gso(skb))
22462b245cb2SAnirudh Venkataramanan return __ice_chk_linearize(skb);
22472b245cb2SAnirudh Venkataramanan
22482b245cb2SAnirudh Venkataramanan /* we can support up to 8 data buffers for a single send */
22492b245cb2SAnirudh Venkataramanan return count != ICE_MAX_BUF_TXD;
22502b245cb2SAnirudh Venkataramanan }
22512b245cb2SAnirudh Venkataramanan
22522b245cb2SAnirudh Venkataramanan /**
2253ea9b847cSJacob Keller * ice_tstamp - set up context descriptor for hardware timestamp
2254ea9b847cSJacob Keller * @tx_ring: pointer to the Tx ring to send buffer on
2255ea9b847cSJacob Keller * @skb: pointer to the SKB we're sending
2256ea9b847cSJacob Keller * @first: Tx buffer
2257ea9b847cSJacob Keller * @off: Tx offload parameters
2258ea9b847cSJacob Keller */
2259ea9b847cSJacob Keller static void
ice_tstamp(struct ice_tx_ring * tx_ring,struct sk_buff * skb,struct ice_tx_buf * first,struct ice_tx_offload_params * off)2260e72bba21SMaciej Fijalkowski ice_tstamp(struct ice_tx_ring *tx_ring, struct sk_buff *skb,
2261ea9b847cSJacob Keller struct ice_tx_buf *first, struct ice_tx_offload_params *off)
2262ea9b847cSJacob Keller {
2263ea9b847cSJacob Keller s8 idx;
2264ea9b847cSJacob Keller
2265ea9b847cSJacob Keller /* only timestamp the outbound packet if the user has requested it */
2266ea9b847cSJacob Keller if (likely(!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)))
2267ea9b847cSJacob Keller return;
2268ea9b847cSJacob Keller
2269ea9b847cSJacob Keller /* Tx timestamps cannot be sampled when doing TSO */
2270ea9b847cSJacob Keller if (first->tx_flags & ICE_TX_FLAGS_TSO)
2271ea9b847cSJacob Keller return;
2272ea9b847cSJacob Keller
2273ea9b847cSJacob Keller /* Grab an open timestamp slot */
2274ea9b847cSJacob Keller idx = ice_ptp_request_ts(tx_ring->tx_tstamps, skb);
2275f020481bSJacob Keller if (idx < 0) {
2276f020481bSJacob Keller tx_ring->vsi->back->ptp.tx_hwtstamp_skipped++;
2277ea9b847cSJacob Keller return;
2278f020481bSJacob Keller }
2279ea9b847cSJacob Keller
2280ea9b847cSJacob Keller off->cd_qw1 |= (u64)(ICE_TX_DESC_DTYPE_CTX |
2281ea9b847cSJacob Keller (ICE_TX_CTX_DESC_TSYN << ICE_TXD_CTX_QW1_CMD_S) |
2282ea9b847cSJacob Keller ((u64)idx << ICE_TXD_CTX_QW1_TSO_LEN_S));
2283ea9b847cSJacob Keller first->tx_flags |= ICE_TX_FLAGS_TSYN;
2284ea9b847cSJacob Keller }
2285ea9b847cSJacob Keller
2286ea9b847cSJacob Keller /**
22872b245cb2SAnirudh Venkataramanan * ice_xmit_frame_ring - Sends buffer on Tx ring
22882b245cb2SAnirudh Venkataramanan * @skb: send buffer
22892b245cb2SAnirudh Venkataramanan * @tx_ring: ring to send buffer on
22902b245cb2SAnirudh Venkataramanan *
22912b245cb2SAnirudh Venkataramanan * Returns NETDEV_TX_OK if sent, else an error code
22922b245cb2SAnirudh Venkataramanan */
22932b245cb2SAnirudh Venkataramanan static netdev_tx_t
ice_xmit_frame_ring(struct sk_buff * skb,struct ice_tx_ring * tx_ring)2294e72bba21SMaciej Fijalkowski ice_xmit_frame_ring(struct sk_buff *skb, struct ice_tx_ring *tx_ring)
22952b245cb2SAnirudh Venkataramanan {
2296d76a60baSAnirudh Venkataramanan struct ice_tx_offload_params offload = { 0 };
22970c3a6101SDave Ertman struct ice_vsi *vsi = tx_ring->vsi;
22982b245cb2SAnirudh Venkataramanan struct ice_tx_buf *first;
2299f9f83202SDave Ertman struct ethhdr *eth;
23002b245cb2SAnirudh Venkataramanan unsigned int count;
2301d76a60baSAnirudh Venkataramanan int tso, csum;
23022b245cb2SAnirudh Venkataramanan
23033089cf6dSJesse Brandeburg ice_trace(xmit_frame_ring, tx_ring, skb);
23043089cf6dSJesse Brandeburg
2305fce92dbcSPawel Chmielewski if (unlikely(ipv6_hopopt_jumbo_remove(skb)))
2306fce92dbcSPawel Chmielewski goto out_drop;
2307fce92dbcSPawel Chmielewski
23082b245cb2SAnirudh Venkataramanan count = ice_xmit_desc_count(skb);
23092b245cb2SAnirudh Venkataramanan if (ice_chk_linearize(skb, count)) {
23102b245cb2SAnirudh Venkataramanan if (__skb_linearize(skb))
23112b245cb2SAnirudh Venkataramanan goto out_drop;
23122b245cb2SAnirudh Venkataramanan count = ice_txd_use_count(skb->len);
2313288ecf49SBenjamin Mikailenko tx_ring->ring_stats->tx_stats.tx_linearize++;
23142b245cb2SAnirudh Venkataramanan }
23152b245cb2SAnirudh Venkataramanan
23162b245cb2SAnirudh Venkataramanan /* need: 1 descriptor per page * PAGE_SIZE/ICE_MAX_DATA_PER_TXD,
23172b245cb2SAnirudh Venkataramanan * + 1 desc for skb_head_len/ICE_MAX_DATA_PER_TXD,
23182b245cb2SAnirudh Venkataramanan * + 4 desc gap to avoid the cache line where head is,
23192b245cb2SAnirudh Venkataramanan * + 1 desc for context descriptor,
23202b245cb2SAnirudh Venkataramanan * otherwise try next time
23212b245cb2SAnirudh Venkataramanan */
2322c585ea42SBrett Creeley if (ice_maybe_stop_tx(tx_ring, count + ICE_DESCS_PER_CACHE_LINE +
2323c585ea42SBrett Creeley ICE_DESCS_FOR_CTX_DESC)) {
2324288ecf49SBenjamin Mikailenko tx_ring->ring_stats->tx_stats.tx_busy++;
23252b245cb2SAnirudh Venkataramanan return NETDEV_TX_BUSY;
23262b245cb2SAnirudh Venkataramanan }
23272b245cb2SAnirudh Venkataramanan
2328cc14db11SJesse Brandeburg /* prefetch for bql data which is infrequently used */
2329cc14db11SJesse Brandeburg netdev_txq_bql_enqueue_prefetchw(txring_txq(tx_ring));
2330cc14db11SJesse Brandeburg
2331d76a60baSAnirudh Venkataramanan offload.tx_ring = tx_ring;
2332d76a60baSAnirudh Venkataramanan
23332b245cb2SAnirudh Venkataramanan /* record the location of the first descriptor for this packet */
23342b245cb2SAnirudh Venkataramanan first = &tx_ring->tx_buf[tx_ring->next_to_use];
23352b245cb2SAnirudh Venkataramanan first->skb = skb;
2336aa1d3fafSAlexander Lobakin first->type = ICE_TX_BUF_SKB;
23372b245cb2SAnirudh Venkataramanan first->bytecount = max_t(unsigned int, skb->len, ETH_ZLEN);
23382b245cb2SAnirudh Venkataramanan first->gso_segs = 1;
2339d76a60baSAnirudh Venkataramanan first->tx_flags = 0;
23402b245cb2SAnirudh Venkataramanan
2341d76a60baSAnirudh Venkataramanan /* prepare the VLAN tagging flags for Tx */
23422bb19d6eSBrett Creeley ice_tx_prepare_vlan_flags(tx_ring, first);
23430d54d8f7SBrett Creeley if (first->tx_flags & ICE_TX_FLAGS_HW_OUTER_SINGLE_VLAN) {
23440d54d8f7SBrett Creeley offload.cd_qw1 |= (u64)(ICE_TX_DESC_DTYPE_CTX |
23450d54d8f7SBrett Creeley (ICE_TX_CTX_DESC_IL2TAG2 <<
23460d54d8f7SBrett Creeley ICE_TXD_CTX_QW1_CMD_S));
23479113302bSJan Sokolowski offload.cd_l2tag2 = first->vid;
23480d54d8f7SBrett Creeley }
2349d76a60baSAnirudh Venkataramanan
2350d76a60baSAnirudh Venkataramanan /* set up TSO offload */
2351d76a60baSAnirudh Venkataramanan tso = ice_tso(first, &offload);
2352d76a60baSAnirudh Venkataramanan if (tso < 0)
2353d76a60baSAnirudh Venkataramanan goto out_drop;
2354d76a60baSAnirudh Venkataramanan
2355d76a60baSAnirudh Venkataramanan /* always set up Tx checksum offload */
2356d76a60baSAnirudh Venkataramanan csum = ice_tx_csum(first, &offload);
2357d76a60baSAnirudh Venkataramanan if (csum < 0)
2358d76a60baSAnirudh Venkataramanan goto out_drop;
2359d76a60baSAnirudh Venkataramanan
23600c3a6101SDave Ertman /* allow CONTROL frames egress from main VSI if FW LLDP disabled */
2361f9f83202SDave Ertman eth = (struct ethhdr *)skb_mac_header(skb);
2362f9f83202SDave Ertman if (unlikely((skb->priority == TC_PRIO_CONTROL ||
2363f9f83202SDave Ertman eth->h_proto == htons(ETH_P_LLDP)) &&
23640c3a6101SDave Ertman vsi->type == ICE_VSI_PF &&
2365fc2d1165SChinh T Cao vsi->port_info->qos_cfg.is_sw_lldp))
23660c3a6101SDave Ertman offload.cd_qw1 |= (u64)(ICE_TX_DESC_DTYPE_CTX |
23670c3a6101SDave Ertman ICE_TX_CTX_DESC_SWTCH_UPLINK <<
23680c3a6101SDave Ertman ICE_TXD_CTX_QW1_CMD_S);
23690c3a6101SDave Ertman
2370ea9b847cSJacob Keller ice_tstamp(tx_ring, skb, first, &offload);
2371*ef250903SMichal Swiatkowski if (ice_is_switchdev_running(vsi->back) && vsi->type != ICE_VSI_SF)
2372f5396b8aSGrzegorz Nitka ice_eswitch_set_target_vsi(skb, &offload);
2373ea9b847cSJacob Keller
23740c3a6101SDave Ertman if (offload.cd_qw1 & ICE_TX_DESC_DTYPE_CTX) {
2375d76a60baSAnirudh Venkataramanan struct ice_tx_ctx_desc *cdesc;
237688865fc4SKarol Kolacinski u16 i = tx_ring->next_to_use;
2377d76a60baSAnirudh Venkataramanan
2378d76a60baSAnirudh Venkataramanan /* grab the next descriptor */
2379d76a60baSAnirudh Venkataramanan cdesc = ICE_TX_CTX_DESC(tx_ring, i);
2380d76a60baSAnirudh Venkataramanan i++;
2381d76a60baSAnirudh Venkataramanan tx_ring->next_to_use = (i < tx_ring->count) ? i : 0;
2382d76a60baSAnirudh Venkataramanan
2383d76a60baSAnirudh Venkataramanan /* setup context descriptor */
2384d76a60baSAnirudh Venkataramanan cdesc->tunneling_params = cpu_to_le32(offload.cd_tunnel_params);
2385d76a60baSAnirudh Venkataramanan cdesc->l2tag2 = cpu_to_le16(offload.cd_l2tag2);
2386d76a60baSAnirudh Venkataramanan cdesc->rsvd = cpu_to_le16(0);
2387d76a60baSAnirudh Venkataramanan cdesc->qw1 = cpu_to_le64(offload.cd_qw1);
2388d76a60baSAnirudh Venkataramanan }
2389d76a60baSAnirudh Venkataramanan
2390d76a60baSAnirudh Venkataramanan ice_tx_map(tx_ring, first, &offload);
23912b245cb2SAnirudh Venkataramanan return NETDEV_TX_OK;
23922b245cb2SAnirudh Venkataramanan
23932b245cb2SAnirudh Venkataramanan out_drop:
23943089cf6dSJesse Brandeburg ice_trace(xmit_frame_ring_drop, tx_ring, skb);
23952b245cb2SAnirudh Venkataramanan dev_kfree_skb_any(skb);
23962b245cb2SAnirudh Venkataramanan return NETDEV_TX_OK;
23972b245cb2SAnirudh Venkataramanan }
23982b245cb2SAnirudh Venkataramanan
23992b245cb2SAnirudh Venkataramanan /**
24002b245cb2SAnirudh Venkataramanan * ice_start_xmit - Selects the correct VSI and Tx queue to send buffer
24012b245cb2SAnirudh Venkataramanan * @skb: send buffer
24022b245cb2SAnirudh Venkataramanan * @netdev: network interface device structure
24032b245cb2SAnirudh Venkataramanan *
24042b245cb2SAnirudh Venkataramanan * Returns NETDEV_TX_OK if sent, else an error code
24052b245cb2SAnirudh Venkataramanan */
ice_start_xmit(struct sk_buff * skb,struct net_device * netdev)24062b245cb2SAnirudh Venkataramanan netdev_tx_t ice_start_xmit(struct sk_buff *skb, struct net_device *netdev)
24072b245cb2SAnirudh Venkataramanan {
24082b245cb2SAnirudh Venkataramanan struct ice_netdev_priv *np = netdev_priv(netdev);
24092b245cb2SAnirudh Venkataramanan struct ice_vsi *vsi = np->vsi;
2410e72bba21SMaciej Fijalkowski struct ice_tx_ring *tx_ring;
24112b245cb2SAnirudh Venkataramanan
24122b245cb2SAnirudh Venkataramanan tx_ring = vsi->tx_rings[skb->queue_mapping];
24132b245cb2SAnirudh Venkataramanan
24142b245cb2SAnirudh Venkataramanan /* hardware can't handle really short frames, hardware padding works
24152b245cb2SAnirudh Venkataramanan * beyond this point
24162b245cb2SAnirudh Venkataramanan */
24172b245cb2SAnirudh Venkataramanan if (skb_put_padto(skb, ICE_MIN_TX_LEN))
24182b245cb2SAnirudh Venkataramanan return NETDEV_TX_OK;
24192b245cb2SAnirudh Venkataramanan
24202b245cb2SAnirudh Venkataramanan return ice_xmit_frame_ring(skb, tx_ring);
24212b245cb2SAnirudh Venkataramanan }
2422148beb61SHenry Tieman
2423148beb61SHenry Tieman /**
24242a87bd73SDave Ertman * ice_get_dscp_up - return the UP/TC value for a SKB
24252a87bd73SDave Ertman * @dcbcfg: DCB config that contains DSCP to UP/TC mapping
24262a87bd73SDave Ertman * @skb: SKB to query for info to determine UP/TC
24272a87bd73SDave Ertman *
24282a87bd73SDave Ertman * This function is to only be called when the PF is in L3 DSCP PFC mode
24292a87bd73SDave Ertman */
ice_get_dscp_up(struct ice_dcbx_cfg * dcbcfg,struct sk_buff * skb)24302a87bd73SDave Ertman static u8 ice_get_dscp_up(struct ice_dcbx_cfg *dcbcfg, struct sk_buff *skb)
24312a87bd73SDave Ertman {
24322a87bd73SDave Ertman u8 dscp = 0;
24332a87bd73SDave Ertman
24342a87bd73SDave Ertman if (skb->protocol == htons(ETH_P_IP))
24352a87bd73SDave Ertman dscp = ipv4_get_dsfield(ip_hdr(skb)) >> 2;
24362a87bd73SDave Ertman else if (skb->protocol == htons(ETH_P_IPV6))
24372a87bd73SDave Ertman dscp = ipv6_get_dsfield(ipv6_hdr(skb)) >> 2;
24382a87bd73SDave Ertman
24392a87bd73SDave Ertman return dcbcfg->dscp_map[dscp];
24402a87bd73SDave Ertman }
24412a87bd73SDave Ertman
24422a87bd73SDave Ertman u16
ice_select_queue(struct net_device * netdev,struct sk_buff * skb,struct net_device * sb_dev)24432a87bd73SDave Ertman ice_select_queue(struct net_device *netdev, struct sk_buff *skb,
24442a87bd73SDave Ertman struct net_device *sb_dev)
24452a87bd73SDave Ertman {
24462a87bd73SDave Ertman struct ice_pf *pf = ice_netdev_to_pf(netdev);
24472a87bd73SDave Ertman struct ice_dcbx_cfg *dcbcfg;
24482a87bd73SDave Ertman
24492a87bd73SDave Ertman dcbcfg = &pf->hw.port_info->qos_cfg.local_dcbx_cfg;
24502a87bd73SDave Ertman if (dcbcfg->pfc_mode == ICE_QOS_MODE_DSCP)
24512a87bd73SDave Ertman skb->priority = ice_get_dscp_up(dcbcfg, skb);
24522a87bd73SDave Ertman
24532a87bd73SDave Ertman return netdev_pick_tx(netdev, skb, sb_dev);
24542a87bd73SDave Ertman }
24552a87bd73SDave Ertman
24562a87bd73SDave Ertman /**
2457148beb61SHenry Tieman * ice_clean_ctrl_tx_irq - interrupt handler for flow director Tx queue
2458148beb61SHenry Tieman * @tx_ring: tx_ring to clean
2459148beb61SHenry Tieman */
ice_clean_ctrl_tx_irq(struct ice_tx_ring * tx_ring)2460e72bba21SMaciej Fijalkowski void ice_clean_ctrl_tx_irq(struct ice_tx_ring *tx_ring)
2461148beb61SHenry Tieman {
2462148beb61SHenry Tieman struct ice_vsi *vsi = tx_ring->vsi;
2463148beb61SHenry Tieman s16 i = tx_ring->next_to_clean;
2464148beb61SHenry Tieman int budget = ICE_DFLT_IRQ_WORK;
2465148beb61SHenry Tieman struct ice_tx_desc *tx_desc;
2466148beb61SHenry Tieman struct ice_tx_buf *tx_buf;
2467148beb61SHenry Tieman
2468148beb61SHenry Tieman tx_buf = &tx_ring->tx_buf[i];
2469148beb61SHenry Tieman tx_desc = ICE_TX_DESC(tx_ring, i);
2470148beb61SHenry Tieman i -= tx_ring->count;
2471148beb61SHenry Tieman
2472148beb61SHenry Tieman do {
2473148beb61SHenry Tieman struct ice_tx_desc *eop_desc = tx_buf->next_to_watch;
2474148beb61SHenry Tieman
2475148beb61SHenry Tieman /* if next_to_watch is not set then there is no pending work */
2476148beb61SHenry Tieman if (!eop_desc)
2477148beb61SHenry Tieman break;
2478148beb61SHenry Tieman
2479148beb61SHenry Tieman /* prevent any other reads prior to eop_desc */
2480148beb61SHenry Tieman smp_rmb();
2481148beb61SHenry Tieman
2482148beb61SHenry Tieman /* if the descriptor isn't done, no work to do */
2483148beb61SHenry Tieman if (!(eop_desc->cmd_type_offset_bsz &
2484148beb61SHenry Tieman cpu_to_le64(ICE_TX_DESC_DTYPE_DESC_DONE)))
2485148beb61SHenry Tieman break;
2486148beb61SHenry Tieman
2487148beb61SHenry Tieman /* clear next_to_watch to prevent false hangs */
2488148beb61SHenry Tieman tx_buf->next_to_watch = NULL;
2489148beb61SHenry Tieman tx_desc->buf_addr = 0;
2490148beb61SHenry Tieman tx_desc->cmd_type_offset_bsz = 0;
2491148beb61SHenry Tieman
2492148beb61SHenry Tieman /* move past filter desc */
2493148beb61SHenry Tieman tx_buf++;
2494148beb61SHenry Tieman tx_desc++;
2495148beb61SHenry Tieman i++;
2496148beb61SHenry Tieman if (unlikely(!i)) {
2497148beb61SHenry Tieman i -= tx_ring->count;
2498148beb61SHenry Tieman tx_buf = tx_ring->tx_buf;
2499148beb61SHenry Tieman tx_desc = ICE_TX_DESC(tx_ring, 0);
2500148beb61SHenry Tieman }
2501148beb61SHenry Tieman
2502148beb61SHenry Tieman /* unmap the data header */
2503148beb61SHenry Tieman if (dma_unmap_len(tx_buf, len))
2504148beb61SHenry Tieman dma_unmap_single(tx_ring->dev,
2505148beb61SHenry Tieman dma_unmap_addr(tx_buf, dma),
2506148beb61SHenry Tieman dma_unmap_len(tx_buf, len),
2507148beb61SHenry Tieman DMA_TO_DEVICE);
2508aa1d3fafSAlexander Lobakin if (tx_buf->type == ICE_TX_BUF_DUMMY)
2509148beb61SHenry Tieman devm_kfree(tx_ring->dev, tx_buf->raw_buf);
2510148beb61SHenry Tieman
2511148beb61SHenry Tieman /* clear next_to_watch to prevent false hangs */
2512aa1d3fafSAlexander Lobakin tx_buf->type = ICE_TX_BUF_EMPTY;
2513148beb61SHenry Tieman tx_buf->tx_flags = 0;
2514148beb61SHenry Tieman tx_buf->next_to_watch = NULL;
2515148beb61SHenry Tieman dma_unmap_len_set(tx_buf, len, 0);
2516148beb61SHenry Tieman tx_desc->buf_addr = 0;
2517148beb61SHenry Tieman tx_desc->cmd_type_offset_bsz = 0;
2518148beb61SHenry Tieman
2519148beb61SHenry Tieman /* move past eop_desc for start of next FD desc */
2520148beb61SHenry Tieman tx_buf++;
2521148beb61SHenry Tieman tx_desc++;
2522148beb61SHenry Tieman i++;
2523148beb61SHenry Tieman if (unlikely(!i)) {
2524148beb61SHenry Tieman i -= tx_ring->count;
2525148beb61SHenry Tieman tx_buf = tx_ring->tx_buf;
2526148beb61SHenry Tieman tx_desc = ICE_TX_DESC(tx_ring, 0);
2527148beb61SHenry Tieman }
2528148beb61SHenry Tieman
2529148beb61SHenry Tieman budget--;
2530148beb61SHenry Tieman } while (likely(budget));
2531148beb61SHenry Tieman
2532148beb61SHenry Tieman i += tx_ring->count;
2533148beb61SHenry Tieman tx_ring->next_to_clean = i;
2534148beb61SHenry Tieman
2535148beb61SHenry Tieman /* re-enable interrupt if needed */
2536148beb61SHenry Tieman ice_irq_dynamic_ena(&vsi->back->hw, vsi, vsi->q_vectors[0]);
2537148beb61SHenry Tieman }
2538