xref: /linux/drivers/net/ethernet/qlogic/qede/qede_fp.c (revision 79790b6818e96c58fe2bffee1b418c16e64e7b80)
1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
2 /* QLogic qede NIC Driver
3  * Copyright (c) 2015-2017  QLogic Corporation
4  * Copyright (c) 2019-2020 Marvell International Ltd.
5  */
6 
7 #include <linux/netdevice.h>
8 #include <linux/etherdevice.h>
9 #include <linux/skbuff.h>
10 #include <linux/bpf_trace.h>
11 #include <net/udp_tunnel.h>
12 #include <linux/ip.h>
13 #include <net/gro.h>
14 #include <net/ipv6.h>
15 #include <net/tcp.h>
16 #include <linux/if_ether.h>
17 #include <linux/if_vlan.h>
18 #include <net/ip6_checksum.h>
19 #include "qede_ptp.h"
20 
21 #include <linux/qed/qed_if.h>
22 #include "qede.h"
23 /*********************************
24  * Content also used by slowpath *
25  *********************************/
26 
qede_alloc_rx_buffer(struct qede_rx_queue * rxq,bool allow_lazy)27 int qede_alloc_rx_buffer(struct qede_rx_queue *rxq, bool allow_lazy)
28 {
29 	struct sw_rx_data *sw_rx_data;
30 	struct eth_rx_bd *rx_bd;
31 	dma_addr_t mapping;
32 	struct page *data;
33 
34 	/* In case lazy-allocation is allowed, postpone allocation until the
35 	 * end of the NAPI run. We'd still need to make sure the Rx ring has
36 	 * sufficient buffers to guarantee an additional Rx interrupt.
37 	 */
38 	if (allow_lazy && likely(rxq->filled_buffers > 12)) {
39 		rxq->filled_buffers--;
40 		return 0;
41 	}
42 
43 	data = alloc_pages(GFP_ATOMIC, 0);
44 	if (unlikely(!data))
45 		return -ENOMEM;
46 
47 	/* Map the entire page as it would be used
48 	 * for multiple RX buffer segment size mapping.
49 	 */
50 	mapping = dma_map_page(rxq->dev, data, 0,
51 			       PAGE_SIZE, rxq->data_direction);
52 	if (unlikely(dma_mapping_error(rxq->dev, mapping))) {
53 		__free_page(data);
54 		return -ENOMEM;
55 	}
56 
57 	sw_rx_data = &rxq->sw_rx_ring[rxq->sw_rx_prod & NUM_RX_BDS_MAX];
58 	sw_rx_data->page_offset = 0;
59 	sw_rx_data->data = data;
60 	sw_rx_data->mapping = mapping;
61 
62 	/* Advance PROD and get BD pointer */
63 	rx_bd = (struct eth_rx_bd *)qed_chain_produce(&rxq->rx_bd_ring);
64 	WARN_ON(!rx_bd);
65 	rx_bd->addr.hi = cpu_to_le32(upper_32_bits(mapping));
66 	rx_bd->addr.lo = cpu_to_le32(lower_32_bits(mapping) +
67 				     rxq->rx_headroom);
68 
69 	rxq->sw_rx_prod++;
70 	rxq->filled_buffers++;
71 
72 	return 0;
73 }
74 
75 /* Unmap the data and free skb */
qede_free_tx_pkt(struct qede_dev * edev,struct qede_tx_queue * txq,int * len)76 int qede_free_tx_pkt(struct qede_dev *edev, struct qede_tx_queue *txq, int *len)
77 {
78 	u16 idx = txq->sw_tx_cons;
79 	struct sk_buff *skb = txq->sw_tx_ring.skbs[idx].skb;
80 	struct eth_tx_1st_bd *first_bd;
81 	struct eth_tx_bd *tx_data_bd;
82 	int bds_consumed = 0;
83 	int nbds;
84 	bool data_split = txq->sw_tx_ring.skbs[idx].flags & QEDE_TSO_SPLIT_BD;
85 	int i, split_bd_len = 0;
86 
87 	if (unlikely(!skb)) {
88 		DP_ERR(edev,
89 		       "skb is null for txq idx=%d txq->sw_tx_cons=%d txq->sw_tx_prod=%d\n",
90 		       idx, txq->sw_tx_cons, txq->sw_tx_prod);
91 		return -1;
92 	}
93 
94 	*len = skb->len;
95 
96 	first_bd = (struct eth_tx_1st_bd *)qed_chain_consume(&txq->tx_pbl);
97 
98 	bds_consumed++;
99 
100 	nbds = first_bd->data.nbds;
101 
102 	if (data_split) {
103 		struct eth_tx_bd *split = (struct eth_tx_bd *)
104 			qed_chain_consume(&txq->tx_pbl);
105 		split_bd_len = BD_UNMAP_LEN(split);
106 		bds_consumed++;
107 	}
108 	dma_unmap_single(&edev->pdev->dev, BD_UNMAP_ADDR(first_bd),
109 			 BD_UNMAP_LEN(first_bd) + split_bd_len, DMA_TO_DEVICE);
110 
111 	/* Unmap the data of the skb frags */
112 	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++, bds_consumed++) {
113 		tx_data_bd = (struct eth_tx_bd *)
114 			qed_chain_consume(&txq->tx_pbl);
115 		dma_unmap_page(&edev->pdev->dev, BD_UNMAP_ADDR(tx_data_bd),
116 			       BD_UNMAP_LEN(tx_data_bd), DMA_TO_DEVICE);
117 	}
118 
119 	while (bds_consumed++ < nbds)
120 		qed_chain_consume(&txq->tx_pbl);
121 
122 	/* Free skb */
123 	dev_kfree_skb_any(skb);
124 	txq->sw_tx_ring.skbs[idx].skb = NULL;
125 	txq->sw_tx_ring.skbs[idx].flags = 0;
126 
127 	return 0;
128 }
129 
130 /* Unmap the data and free skb when mapping failed during start_xmit */
qede_free_failed_tx_pkt(struct qede_tx_queue * txq,struct eth_tx_1st_bd * first_bd,int nbd,bool data_split)131 static void qede_free_failed_tx_pkt(struct qede_tx_queue *txq,
132 				    struct eth_tx_1st_bd *first_bd,
133 				    int nbd, bool data_split)
134 {
135 	u16 idx = txq->sw_tx_prod;
136 	struct sk_buff *skb = txq->sw_tx_ring.skbs[idx].skb;
137 	struct eth_tx_bd *tx_data_bd;
138 	int i, split_bd_len = 0;
139 
140 	/* Return prod to its position before this skb was handled */
141 	qed_chain_set_prod(&txq->tx_pbl,
142 			   le16_to_cpu(txq->tx_db.data.bd_prod), first_bd);
143 
144 	first_bd = (struct eth_tx_1st_bd *)qed_chain_produce(&txq->tx_pbl);
145 
146 	if (data_split) {
147 		struct eth_tx_bd *split = (struct eth_tx_bd *)
148 					  qed_chain_produce(&txq->tx_pbl);
149 		split_bd_len = BD_UNMAP_LEN(split);
150 		nbd--;
151 	}
152 
153 	dma_unmap_single(txq->dev, BD_UNMAP_ADDR(first_bd),
154 			 BD_UNMAP_LEN(first_bd) + split_bd_len, DMA_TO_DEVICE);
155 
156 	/* Unmap the data of the skb frags */
157 	for (i = 0; i < nbd; i++) {
158 		tx_data_bd = (struct eth_tx_bd *)
159 			qed_chain_produce(&txq->tx_pbl);
160 		if (tx_data_bd->nbytes)
161 			dma_unmap_page(txq->dev,
162 				       BD_UNMAP_ADDR(tx_data_bd),
163 				       BD_UNMAP_LEN(tx_data_bd), DMA_TO_DEVICE);
164 	}
165 
166 	/* Return again prod to its position before this skb was handled */
167 	qed_chain_set_prod(&txq->tx_pbl,
168 			   le16_to_cpu(txq->tx_db.data.bd_prod), first_bd);
169 
170 	/* Free skb */
171 	dev_kfree_skb_any(skb);
172 	txq->sw_tx_ring.skbs[idx].skb = NULL;
173 	txq->sw_tx_ring.skbs[idx].flags = 0;
174 }
175 
qede_xmit_type(struct sk_buff * skb,int * ipv6_ext)176 static u32 qede_xmit_type(struct sk_buff *skb, int *ipv6_ext)
177 {
178 	u32 rc = XMIT_L4_CSUM;
179 	__be16 l3_proto;
180 
181 	if (skb->ip_summed != CHECKSUM_PARTIAL)
182 		return XMIT_PLAIN;
183 
184 	l3_proto = vlan_get_protocol(skb);
185 	if (l3_proto == htons(ETH_P_IPV6) &&
186 	    (ipv6_hdr(skb)->nexthdr == NEXTHDR_IPV6))
187 		*ipv6_ext = 1;
188 
189 	if (skb->encapsulation) {
190 		rc |= XMIT_ENC;
191 		if (skb_is_gso(skb)) {
192 			unsigned short gso_type = skb_shinfo(skb)->gso_type;
193 
194 			if ((gso_type & SKB_GSO_UDP_TUNNEL_CSUM) ||
195 			    (gso_type & SKB_GSO_GRE_CSUM))
196 				rc |= XMIT_ENC_GSO_L4_CSUM;
197 
198 			rc |= XMIT_LSO;
199 			return rc;
200 		}
201 	}
202 
203 	if (skb_is_gso(skb))
204 		rc |= XMIT_LSO;
205 
206 	return rc;
207 }
208 
qede_set_params_for_ipv6_ext(struct sk_buff * skb,struct eth_tx_2nd_bd * second_bd,struct eth_tx_3rd_bd * third_bd)209 static void qede_set_params_for_ipv6_ext(struct sk_buff *skb,
210 					 struct eth_tx_2nd_bd *second_bd,
211 					 struct eth_tx_3rd_bd *third_bd)
212 {
213 	u8 l4_proto;
214 	u16 bd2_bits1 = 0, bd2_bits2 = 0;
215 
216 	bd2_bits1 |= (1 << ETH_TX_DATA_2ND_BD_IPV6_EXT_SHIFT);
217 
218 	bd2_bits2 |= ((skb_transport_offset(skb) >> 1) &
219 		     ETH_TX_DATA_2ND_BD_L4_HDR_START_OFFSET_W_MASK)
220 		    << ETH_TX_DATA_2ND_BD_L4_HDR_START_OFFSET_W_SHIFT;
221 
222 	bd2_bits1 |= (ETH_L4_PSEUDO_CSUM_CORRECT_LENGTH <<
223 		      ETH_TX_DATA_2ND_BD_L4_PSEUDO_CSUM_MODE_SHIFT);
224 
225 	if (vlan_get_protocol(skb) == htons(ETH_P_IPV6))
226 		l4_proto = ipv6_hdr(skb)->nexthdr;
227 	else
228 		l4_proto = ip_hdr(skb)->protocol;
229 
230 	if (l4_proto == IPPROTO_UDP)
231 		bd2_bits1 |= 1 << ETH_TX_DATA_2ND_BD_L4_UDP_SHIFT;
232 
233 	if (third_bd)
234 		third_bd->data.bitfields |=
235 			cpu_to_le16(((tcp_hdrlen(skb) / 4) &
236 				ETH_TX_DATA_3RD_BD_TCP_HDR_LEN_DW_MASK) <<
237 				ETH_TX_DATA_3RD_BD_TCP_HDR_LEN_DW_SHIFT);
238 
239 	second_bd->data.bitfields1 = cpu_to_le16(bd2_bits1);
240 	second_bd->data.bitfields2 = cpu_to_le16(bd2_bits2);
241 }
242 
map_frag_to_bd(struct qede_tx_queue * txq,skb_frag_t * frag,struct eth_tx_bd * bd)243 static int map_frag_to_bd(struct qede_tx_queue *txq,
244 			  skb_frag_t *frag, struct eth_tx_bd *bd)
245 {
246 	dma_addr_t mapping;
247 
248 	/* Map skb non-linear frag data for DMA */
249 	mapping = skb_frag_dma_map(txq->dev, frag, 0,
250 				   skb_frag_size(frag), DMA_TO_DEVICE);
251 	if (unlikely(dma_mapping_error(txq->dev, mapping)))
252 		return -ENOMEM;
253 
254 	/* Setup the data pointer of the frag data */
255 	BD_SET_UNMAP_ADDR_LEN(bd, mapping, skb_frag_size(frag));
256 
257 	return 0;
258 }
259 
qede_get_skb_hlen(struct sk_buff * skb,bool is_encap_pkt)260 static u16 qede_get_skb_hlen(struct sk_buff *skb, bool is_encap_pkt)
261 {
262 	if (is_encap_pkt)
263 		return skb_inner_tcp_all_headers(skb);
264 
265 	return skb_tcp_all_headers(skb);
266 }
267 
268 /* +2 for 1st BD for headers and 2nd BD for headlen (if required) */
269 #if ((MAX_SKB_FRAGS + 2) > ETH_TX_MAX_BDS_PER_NON_LSO_PACKET)
qede_pkt_req_lin(struct sk_buff * skb,u8 xmit_type)270 static bool qede_pkt_req_lin(struct sk_buff *skb, u8 xmit_type)
271 {
272 	int allowed_frags = ETH_TX_MAX_BDS_PER_NON_LSO_PACKET - 1;
273 
274 	if (xmit_type & XMIT_LSO) {
275 		int hlen;
276 
277 		hlen = qede_get_skb_hlen(skb, xmit_type & XMIT_ENC);
278 
279 		/* linear payload would require its own BD */
280 		if (skb_headlen(skb) > hlen)
281 			allowed_frags--;
282 	}
283 
284 	return (skb_shinfo(skb)->nr_frags > allowed_frags);
285 }
286 #endif
287 
qede_update_tx_producer(struct qede_tx_queue * txq)288 static inline void qede_update_tx_producer(struct qede_tx_queue *txq)
289 {
290 	/* wmb makes sure that the BDs data is updated before updating the
291 	 * producer, otherwise FW may read old data from the BDs.
292 	 */
293 	wmb();
294 	barrier();
295 	writel(txq->tx_db.raw, txq->doorbell_addr);
296 
297 	/* Fence required to flush the write combined buffer, since another
298 	 * CPU may write to the same doorbell address and data may be lost
299 	 * due to relaxed order nature of write combined bar.
300 	 */
301 	wmb();
302 }
303 
qede_xdp_xmit(struct qede_tx_queue * txq,dma_addr_t dma,u16 pad,u16 len,struct page * page,struct xdp_frame * xdpf)304 static int qede_xdp_xmit(struct qede_tx_queue *txq, dma_addr_t dma, u16 pad,
305 			 u16 len, struct page *page, struct xdp_frame *xdpf)
306 {
307 	struct eth_tx_1st_bd *bd;
308 	struct sw_tx_xdp *xdp;
309 	u16 val;
310 
311 	if (unlikely(qed_chain_get_elem_used(&txq->tx_pbl) >=
312 		     txq->num_tx_buffers)) {
313 		txq->stopped_cnt++;
314 		return -ENOMEM;
315 	}
316 
317 	bd = qed_chain_produce(&txq->tx_pbl);
318 	bd->data.nbds = 1;
319 	bd->data.bd_flags.bitfields = BIT(ETH_TX_1ST_BD_FLAGS_START_BD_SHIFT);
320 
321 	val = (len & ETH_TX_DATA_1ST_BD_PKT_LEN_MASK) <<
322 	       ETH_TX_DATA_1ST_BD_PKT_LEN_SHIFT;
323 
324 	bd->data.bitfields = cpu_to_le16(val);
325 
326 	/* We can safely ignore the offset, as it's 0 for XDP */
327 	BD_SET_UNMAP_ADDR_LEN(bd, dma + pad, len);
328 
329 	xdp = txq->sw_tx_ring.xdp + txq->sw_tx_prod;
330 	xdp->mapping = dma;
331 	xdp->page = page;
332 	xdp->xdpf = xdpf;
333 
334 	txq->sw_tx_prod = (txq->sw_tx_prod + 1) % txq->num_tx_buffers;
335 
336 	return 0;
337 }
338 
qede_xdp_transmit(struct net_device * dev,int n_frames,struct xdp_frame ** frames,u32 flags)339 int qede_xdp_transmit(struct net_device *dev, int n_frames,
340 		      struct xdp_frame **frames, u32 flags)
341 {
342 	struct qede_dev *edev = netdev_priv(dev);
343 	struct device *dmadev = &edev->pdev->dev;
344 	struct qede_tx_queue *xdp_tx;
345 	struct xdp_frame *xdpf;
346 	dma_addr_t mapping;
347 	int i, nxmit = 0;
348 	u16 xdp_prod;
349 
350 	if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
351 		return -EINVAL;
352 
353 	if (unlikely(!netif_running(dev)))
354 		return -ENETDOWN;
355 
356 	i = smp_processor_id() % edev->total_xdp_queues;
357 	xdp_tx = edev->fp_array[i].xdp_tx;
358 
359 	spin_lock(&xdp_tx->xdp_tx_lock);
360 
361 	for (i = 0; i < n_frames; i++) {
362 		xdpf = frames[i];
363 
364 		mapping = dma_map_single(dmadev, xdpf->data, xdpf->len,
365 					 DMA_TO_DEVICE);
366 		if (unlikely(dma_mapping_error(dmadev, mapping)))
367 			break;
368 
369 		if (unlikely(qede_xdp_xmit(xdp_tx, mapping, 0, xdpf->len,
370 					   NULL, xdpf)))
371 			break;
372 		nxmit++;
373 	}
374 
375 	if (flags & XDP_XMIT_FLUSH) {
376 		xdp_prod = qed_chain_get_prod_idx(&xdp_tx->tx_pbl);
377 
378 		xdp_tx->tx_db.data.bd_prod = cpu_to_le16(xdp_prod);
379 		qede_update_tx_producer(xdp_tx);
380 	}
381 
382 	spin_unlock(&xdp_tx->xdp_tx_lock);
383 
384 	return nxmit;
385 }
386 
qede_txq_has_work(struct qede_tx_queue * txq)387 int qede_txq_has_work(struct qede_tx_queue *txq)
388 {
389 	u16 hw_bd_cons;
390 
391 	/* Tell compiler that consumer and producer can change */
392 	barrier();
393 	hw_bd_cons = le16_to_cpu(*txq->hw_cons_ptr);
394 	if (qed_chain_get_cons_idx(&txq->tx_pbl) == hw_bd_cons + 1)
395 		return 0;
396 
397 	return hw_bd_cons != qed_chain_get_cons_idx(&txq->tx_pbl);
398 }
399 
qede_xdp_tx_int(struct qede_dev * edev,struct qede_tx_queue * txq)400 static void qede_xdp_tx_int(struct qede_dev *edev, struct qede_tx_queue *txq)
401 {
402 	struct sw_tx_xdp *xdp_info, *xdp_arr = txq->sw_tx_ring.xdp;
403 	struct device *dev = &edev->pdev->dev;
404 	struct xdp_frame *xdpf;
405 	u16 hw_bd_cons;
406 
407 	hw_bd_cons = le16_to_cpu(*txq->hw_cons_ptr);
408 	barrier();
409 
410 	while (hw_bd_cons != qed_chain_get_cons_idx(&txq->tx_pbl)) {
411 		xdp_info = xdp_arr + txq->sw_tx_cons;
412 		xdpf = xdp_info->xdpf;
413 
414 		if (xdpf) {
415 			dma_unmap_single(dev, xdp_info->mapping, xdpf->len,
416 					 DMA_TO_DEVICE);
417 			xdp_return_frame(xdpf);
418 
419 			xdp_info->xdpf = NULL;
420 		} else {
421 			dma_unmap_page(dev, xdp_info->mapping, PAGE_SIZE,
422 				       DMA_BIDIRECTIONAL);
423 			__free_page(xdp_info->page);
424 		}
425 
426 		qed_chain_consume(&txq->tx_pbl);
427 		txq->sw_tx_cons = (txq->sw_tx_cons + 1) % txq->num_tx_buffers;
428 		txq->xmit_pkts++;
429 	}
430 }
431 
qede_tx_int(struct qede_dev * edev,struct qede_tx_queue * txq)432 static int qede_tx_int(struct qede_dev *edev, struct qede_tx_queue *txq)
433 {
434 	unsigned int pkts_compl = 0, bytes_compl = 0;
435 	struct netdev_queue *netdev_txq;
436 	u16 hw_bd_cons;
437 	int rc;
438 
439 	netdev_txq = netdev_get_tx_queue(edev->ndev, txq->ndev_txq_id);
440 
441 	hw_bd_cons = le16_to_cpu(*txq->hw_cons_ptr);
442 	barrier();
443 
444 	while (hw_bd_cons != qed_chain_get_cons_idx(&txq->tx_pbl)) {
445 		int len = 0;
446 
447 		rc = qede_free_tx_pkt(edev, txq, &len);
448 		if (rc) {
449 			DP_NOTICE(edev, "hw_bd_cons = %d, chain_cons=%d\n",
450 				  hw_bd_cons,
451 				  qed_chain_get_cons_idx(&txq->tx_pbl));
452 			break;
453 		}
454 
455 		bytes_compl += len;
456 		pkts_compl++;
457 		txq->sw_tx_cons = (txq->sw_tx_cons + 1) % txq->num_tx_buffers;
458 		txq->xmit_pkts++;
459 	}
460 
461 	netdev_tx_completed_queue(netdev_txq, pkts_compl, bytes_compl);
462 
463 	/* Need to make the tx_bd_cons update visible to start_xmit()
464 	 * before checking for netif_tx_queue_stopped().  Without the
465 	 * memory barrier, there is a small possibility that
466 	 * start_xmit() will miss it and cause the queue to be stopped
467 	 * forever.
468 	 * On the other hand we need an rmb() here to ensure the proper
469 	 * ordering of bit testing in the following
470 	 * netif_tx_queue_stopped(txq) call.
471 	 */
472 	smp_mb();
473 
474 	if (unlikely(netif_tx_queue_stopped(netdev_txq))) {
475 		/* Taking tx_lock is needed to prevent reenabling the queue
476 		 * while it's empty. This could have happen if rx_action() gets
477 		 * suspended in qede_tx_int() after the condition before
478 		 * netif_tx_wake_queue(), while tx_action (qede_start_xmit()):
479 		 *
480 		 * stops the queue->sees fresh tx_bd_cons->releases the queue->
481 		 * sends some packets consuming the whole queue again->
482 		 * stops the queue
483 		 */
484 
485 		__netif_tx_lock(netdev_txq, smp_processor_id());
486 
487 		if ((netif_tx_queue_stopped(netdev_txq)) &&
488 		    (edev->state == QEDE_STATE_OPEN) &&
489 		    (qed_chain_get_elem_left(&txq->tx_pbl)
490 		      >= (MAX_SKB_FRAGS + 1))) {
491 			netif_tx_wake_queue(netdev_txq);
492 			DP_VERBOSE(edev, NETIF_MSG_TX_DONE,
493 				   "Wake queue was called\n");
494 		}
495 
496 		__netif_tx_unlock(netdev_txq);
497 	}
498 
499 	return 0;
500 }
501 
qede_has_rx_work(struct qede_rx_queue * rxq)502 bool qede_has_rx_work(struct qede_rx_queue *rxq)
503 {
504 	u16 hw_comp_cons, sw_comp_cons;
505 
506 	/* Tell compiler that status block fields can change */
507 	barrier();
508 
509 	hw_comp_cons = le16_to_cpu(*rxq->hw_cons_ptr);
510 	sw_comp_cons = qed_chain_get_cons_idx(&rxq->rx_comp_ring);
511 
512 	return hw_comp_cons != sw_comp_cons;
513 }
514 
qede_rx_bd_ring_consume(struct qede_rx_queue * rxq)515 static inline void qede_rx_bd_ring_consume(struct qede_rx_queue *rxq)
516 {
517 	qed_chain_consume(&rxq->rx_bd_ring);
518 	rxq->sw_rx_cons++;
519 }
520 
521 /* This function reuses the buffer(from an offset) from
522  * consumer index to producer index in the bd ring
523  */
qede_reuse_page(struct qede_rx_queue * rxq,struct sw_rx_data * curr_cons)524 static inline void qede_reuse_page(struct qede_rx_queue *rxq,
525 				   struct sw_rx_data *curr_cons)
526 {
527 	struct eth_rx_bd *rx_bd_prod = qed_chain_produce(&rxq->rx_bd_ring);
528 	struct sw_rx_data *curr_prod;
529 	dma_addr_t new_mapping;
530 
531 	curr_prod = &rxq->sw_rx_ring[rxq->sw_rx_prod & NUM_RX_BDS_MAX];
532 	*curr_prod = *curr_cons;
533 
534 	new_mapping = curr_prod->mapping + curr_prod->page_offset;
535 
536 	rx_bd_prod->addr.hi = cpu_to_le32(upper_32_bits(new_mapping));
537 	rx_bd_prod->addr.lo = cpu_to_le32(lower_32_bits(new_mapping) +
538 					  rxq->rx_headroom);
539 
540 	rxq->sw_rx_prod++;
541 	curr_cons->data = NULL;
542 }
543 
544 /* In case of allocation failures reuse buffers
545  * from consumer index to produce buffers for firmware
546  */
qede_recycle_rx_bd_ring(struct qede_rx_queue * rxq,u8 count)547 void qede_recycle_rx_bd_ring(struct qede_rx_queue *rxq, u8 count)
548 {
549 	struct sw_rx_data *curr_cons;
550 
551 	for (; count > 0; count--) {
552 		curr_cons = &rxq->sw_rx_ring[rxq->sw_rx_cons & NUM_RX_BDS_MAX];
553 		qede_reuse_page(rxq, curr_cons);
554 		qede_rx_bd_ring_consume(rxq);
555 	}
556 }
557 
qede_realloc_rx_buffer(struct qede_rx_queue * rxq,struct sw_rx_data * curr_cons)558 static inline int qede_realloc_rx_buffer(struct qede_rx_queue *rxq,
559 					 struct sw_rx_data *curr_cons)
560 {
561 	/* Move to the next segment in the page */
562 	curr_cons->page_offset += rxq->rx_buf_seg_size;
563 
564 	if (curr_cons->page_offset == PAGE_SIZE) {
565 		if (unlikely(qede_alloc_rx_buffer(rxq, true))) {
566 			/* Since we failed to allocate new buffer
567 			 * current buffer can be used again.
568 			 */
569 			curr_cons->page_offset -= rxq->rx_buf_seg_size;
570 
571 			return -ENOMEM;
572 		}
573 
574 		dma_unmap_page(rxq->dev, curr_cons->mapping,
575 			       PAGE_SIZE, rxq->data_direction);
576 	} else {
577 		/* Increment refcount of the page as we don't want
578 		 * network stack to take the ownership of the page
579 		 * which can be recycled multiple times by the driver.
580 		 */
581 		page_ref_inc(curr_cons->data);
582 		qede_reuse_page(rxq, curr_cons);
583 	}
584 
585 	return 0;
586 }
587 
qede_update_rx_prod(struct qede_dev * edev,struct qede_rx_queue * rxq)588 void qede_update_rx_prod(struct qede_dev *edev, struct qede_rx_queue *rxq)
589 {
590 	u16 bd_prod = qed_chain_get_prod_idx(&rxq->rx_bd_ring);
591 	u16 cqe_prod = qed_chain_get_prod_idx(&rxq->rx_comp_ring);
592 	struct eth_rx_prod_data rx_prods = {0};
593 
594 	/* Update producers */
595 	rx_prods.bd_prod = cpu_to_le16(bd_prod);
596 	rx_prods.cqe_prod = cpu_to_le16(cqe_prod);
597 
598 	/* Make sure that the BD and SGE data is updated before updating the
599 	 * producers since FW might read the BD/SGE right after the producer
600 	 * is updated.
601 	 */
602 	wmb();
603 
604 	internal_ram_wr(rxq->hw_rxq_prod_addr, sizeof(rx_prods),
605 			(u32 *)&rx_prods);
606 }
607 
qede_get_rxhash(struct sk_buff * skb,u8 bitfields,__le32 rss_hash)608 static void qede_get_rxhash(struct sk_buff *skb, u8 bitfields, __le32 rss_hash)
609 {
610 	enum pkt_hash_types hash_type = PKT_HASH_TYPE_NONE;
611 	enum rss_hash_type htype;
612 	u32 hash = 0;
613 
614 	htype = GET_FIELD(bitfields, ETH_FAST_PATH_RX_REG_CQE_RSS_HASH_TYPE);
615 	if (htype) {
616 		hash_type = ((htype == RSS_HASH_TYPE_IPV4) ||
617 			     (htype == RSS_HASH_TYPE_IPV6)) ?
618 			    PKT_HASH_TYPE_L3 : PKT_HASH_TYPE_L4;
619 		hash = le32_to_cpu(rss_hash);
620 	}
621 	skb_set_hash(skb, hash, hash_type);
622 }
623 
qede_set_skb_csum(struct sk_buff * skb,u8 csum_flag)624 static void qede_set_skb_csum(struct sk_buff *skb, u8 csum_flag)
625 {
626 	skb_checksum_none_assert(skb);
627 
628 	if (csum_flag & QEDE_CSUM_UNNECESSARY)
629 		skb->ip_summed = CHECKSUM_UNNECESSARY;
630 
631 	if (csum_flag & QEDE_TUNN_CSUM_UNNECESSARY) {
632 		skb->csum_level = 1;
633 		skb->encapsulation = 1;
634 	}
635 }
636 
qede_skb_receive(struct qede_dev * edev,struct qede_fastpath * fp,struct qede_rx_queue * rxq,struct sk_buff * skb,u16 vlan_tag)637 static inline void qede_skb_receive(struct qede_dev *edev,
638 				    struct qede_fastpath *fp,
639 				    struct qede_rx_queue *rxq,
640 				    struct sk_buff *skb, u16 vlan_tag)
641 {
642 	if (vlan_tag)
643 		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tag);
644 
645 	napi_gro_receive(&fp->napi, skb);
646 }
647 
qede_set_gro_params(struct qede_dev * edev,struct sk_buff * skb,struct eth_fast_path_rx_tpa_start_cqe * cqe)648 static void qede_set_gro_params(struct qede_dev *edev,
649 				struct sk_buff *skb,
650 				struct eth_fast_path_rx_tpa_start_cqe *cqe)
651 {
652 	u16 parsing_flags = le16_to_cpu(cqe->pars_flags.flags);
653 
654 	if (((parsing_flags >> PARSING_AND_ERR_FLAGS_L3TYPE_SHIFT) &
655 	    PARSING_AND_ERR_FLAGS_L3TYPE_MASK) == 2)
656 		skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
657 	else
658 		skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
659 
660 	skb_shinfo(skb)->gso_size = __le16_to_cpu(cqe->len_on_first_bd) -
661 				    cqe->header_len;
662 }
663 
qede_fill_frag_skb(struct qede_dev * edev,struct qede_rx_queue * rxq,u8 tpa_agg_index,u16 len_on_bd)664 static int qede_fill_frag_skb(struct qede_dev *edev,
665 			      struct qede_rx_queue *rxq,
666 			      u8 tpa_agg_index, u16 len_on_bd)
667 {
668 	struct sw_rx_data *current_bd = &rxq->sw_rx_ring[rxq->sw_rx_cons &
669 							 NUM_RX_BDS_MAX];
670 	struct qede_agg_info *tpa_info = &rxq->tpa_info[tpa_agg_index];
671 	struct sk_buff *skb = tpa_info->skb;
672 
673 	if (unlikely(tpa_info->state != QEDE_AGG_STATE_START))
674 		goto out;
675 
676 	/* Add one frag and update the appropriate fields in the skb */
677 	skb_fill_page_desc(skb, tpa_info->frag_id++,
678 			   current_bd->data,
679 			   current_bd->page_offset + rxq->rx_headroom,
680 			   len_on_bd);
681 
682 	if (unlikely(qede_realloc_rx_buffer(rxq, current_bd))) {
683 		/* Incr page ref count to reuse on allocation failure
684 		 * so that it doesn't get freed while freeing SKB.
685 		 */
686 		page_ref_inc(current_bd->data);
687 		goto out;
688 	}
689 
690 	qede_rx_bd_ring_consume(rxq);
691 
692 	skb->data_len += len_on_bd;
693 	skb->truesize += rxq->rx_buf_seg_size;
694 	skb->len += len_on_bd;
695 
696 	return 0;
697 
698 out:
699 	tpa_info->state = QEDE_AGG_STATE_ERROR;
700 	qede_recycle_rx_bd_ring(rxq, 1);
701 
702 	return -ENOMEM;
703 }
704 
qede_tunn_exist(u16 flag)705 static bool qede_tunn_exist(u16 flag)
706 {
707 	return !!(flag & (PARSING_AND_ERR_FLAGS_TUNNELEXIST_MASK <<
708 			  PARSING_AND_ERR_FLAGS_TUNNELEXIST_SHIFT));
709 }
710 
qede_check_tunn_csum(u16 flag)711 static u8 qede_check_tunn_csum(u16 flag)
712 {
713 	u16 csum_flag = 0;
714 	u8 tcsum = 0;
715 
716 	if (flag & (PARSING_AND_ERR_FLAGS_TUNNELL4CHKSMWASCALCULATED_MASK <<
717 		    PARSING_AND_ERR_FLAGS_TUNNELL4CHKSMWASCALCULATED_SHIFT))
718 		csum_flag |= PARSING_AND_ERR_FLAGS_TUNNELL4CHKSMERROR_MASK <<
719 			     PARSING_AND_ERR_FLAGS_TUNNELL4CHKSMERROR_SHIFT;
720 
721 	if (flag & (PARSING_AND_ERR_FLAGS_L4CHKSMWASCALCULATED_MASK <<
722 		    PARSING_AND_ERR_FLAGS_L4CHKSMWASCALCULATED_SHIFT)) {
723 		csum_flag |= PARSING_AND_ERR_FLAGS_L4CHKSMERROR_MASK <<
724 			     PARSING_AND_ERR_FLAGS_L4CHKSMERROR_SHIFT;
725 		tcsum = QEDE_TUNN_CSUM_UNNECESSARY;
726 	}
727 
728 	csum_flag |= PARSING_AND_ERR_FLAGS_TUNNELIPHDRERROR_MASK <<
729 		     PARSING_AND_ERR_FLAGS_TUNNELIPHDRERROR_SHIFT |
730 		     PARSING_AND_ERR_FLAGS_IPHDRERROR_MASK <<
731 		     PARSING_AND_ERR_FLAGS_IPHDRERROR_SHIFT;
732 
733 	if (csum_flag & flag)
734 		return QEDE_CSUM_ERROR;
735 
736 	return QEDE_CSUM_UNNECESSARY | tcsum;
737 }
738 
739 static inline struct sk_buff *
qede_build_skb(struct qede_rx_queue * rxq,struct sw_rx_data * bd,u16 len,u16 pad)740 qede_build_skb(struct qede_rx_queue *rxq,
741 	       struct sw_rx_data *bd, u16 len, u16 pad)
742 {
743 	struct sk_buff *skb;
744 	void *buf;
745 
746 	buf = page_address(bd->data) + bd->page_offset;
747 	skb = build_skb(buf, rxq->rx_buf_seg_size);
748 
749 	if (unlikely(!skb))
750 		return NULL;
751 
752 	skb_reserve(skb, pad);
753 	skb_put(skb, len);
754 
755 	return skb;
756 }
757 
758 static struct sk_buff *
qede_tpa_rx_build_skb(struct qede_dev * edev,struct qede_rx_queue * rxq,struct sw_rx_data * bd,u16 len,u16 pad,bool alloc_skb)759 qede_tpa_rx_build_skb(struct qede_dev *edev,
760 		      struct qede_rx_queue *rxq,
761 		      struct sw_rx_data *bd, u16 len, u16 pad,
762 		      bool alloc_skb)
763 {
764 	struct sk_buff *skb;
765 
766 	skb = qede_build_skb(rxq, bd, len, pad);
767 	bd->page_offset += rxq->rx_buf_seg_size;
768 
769 	if (bd->page_offset == PAGE_SIZE) {
770 		if (unlikely(qede_alloc_rx_buffer(rxq, true))) {
771 			DP_NOTICE(edev,
772 				  "Failed to allocate RX buffer for tpa start\n");
773 			bd->page_offset -= rxq->rx_buf_seg_size;
774 			page_ref_inc(bd->data);
775 			dev_kfree_skb_any(skb);
776 			return NULL;
777 		}
778 	} else {
779 		page_ref_inc(bd->data);
780 		qede_reuse_page(rxq, bd);
781 	}
782 
783 	/* We've consumed the first BD and prepared an SKB */
784 	qede_rx_bd_ring_consume(rxq);
785 
786 	return skb;
787 }
788 
789 static struct sk_buff *
qede_rx_build_skb(struct qede_dev * edev,struct qede_rx_queue * rxq,struct sw_rx_data * bd,u16 len,u16 pad)790 qede_rx_build_skb(struct qede_dev *edev,
791 		  struct qede_rx_queue *rxq,
792 		  struct sw_rx_data *bd, u16 len, u16 pad)
793 {
794 	struct sk_buff *skb = NULL;
795 
796 	/* For smaller frames still need to allocate skb, memcpy
797 	 * data and benefit in reusing the page segment instead of
798 	 * un-mapping it.
799 	 */
800 	if ((len + pad <= edev->rx_copybreak)) {
801 		unsigned int offset = bd->page_offset + pad;
802 
803 		skb = netdev_alloc_skb(edev->ndev, QEDE_RX_HDR_SIZE);
804 		if (unlikely(!skb))
805 			return NULL;
806 
807 		skb_reserve(skb, pad);
808 		skb_put_data(skb, page_address(bd->data) + offset, len);
809 		qede_reuse_page(rxq, bd);
810 		goto out;
811 	}
812 
813 	skb = qede_build_skb(rxq, bd, len, pad);
814 
815 	if (unlikely(qede_realloc_rx_buffer(rxq, bd))) {
816 		/* Incr page ref count to reuse on allocation failure so
817 		 * that it doesn't get freed while freeing SKB [as its
818 		 * already mapped there].
819 		 */
820 		page_ref_inc(bd->data);
821 		dev_kfree_skb_any(skb);
822 		return NULL;
823 	}
824 out:
825 	/* We've consumed the first BD and prepared an SKB */
826 	qede_rx_bd_ring_consume(rxq);
827 
828 	return skb;
829 }
830 
qede_tpa_start(struct qede_dev * edev,struct qede_rx_queue * rxq,struct eth_fast_path_rx_tpa_start_cqe * cqe)831 static void qede_tpa_start(struct qede_dev *edev,
832 			   struct qede_rx_queue *rxq,
833 			   struct eth_fast_path_rx_tpa_start_cqe *cqe)
834 {
835 	struct qede_agg_info *tpa_info = &rxq->tpa_info[cqe->tpa_agg_index];
836 	struct sw_rx_data *sw_rx_data_cons;
837 	u16 pad;
838 
839 	sw_rx_data_cons = &rxq->sw_rx_ring[rxq->sw_rx_cons & NUM_RX_BDS_MAX];
840 	pad = cqe->placement_offset + rxq->rx_headroom;
841 
842 	tpa_info->skb = qede_tpa_rx_build_skb(edev, rxq, sw_rx_data_cons,
843 					      le16_to_cpu(cqe->len_on_first_bd),
844 					      pad, false);
845 	tpa_info->buffer.page_offset = sw_rx_data_cons->page_offset;
846 	tpa_info->buffer.mapping = sw_rx_data_cons->mapping;
847 
848 	if (unlikely(!tpa_info->skb)) {
849 		DP_NOTICE(edev, "Failed to allocate SKB for gro\n");
850 
851 		/* Consume from ring but do not produce since
852 		 * this might be used by FW still, it will be re-used
853 		 * at TPA end.
854 		 */
855 		tpa_info->tpa_start_fail = true;
856 		qede_rx_bd_ring_consume(rxq);
857 		tpa_info->state = QEDE_AGG_STATE_ERROR;
858 		goto cons_buf;
859 	}
860 
861 	tpa_info->frag_id = 0;
862 	tpa_info->state = QEDE_AGG_STATE_START;
863 
864 	if ((le16_to_cpu(cqe->pars_flags.flags) >>
865 	     PARSING_AND_ERR_FLAGS_TAG8021QEXIST_SHIFT) &
866 	    PARSING_AND_ERR_FLAGS_TAG8021QEXIST_MASK)
867 		tpa_info->vlan_tag = le16_to_cpu(cqe->vlan_tag);
868 	else
869 		tpa_info->vlan_tag = 0;
870 
871 	qede_get_rxhash(tpa_info->skb, cqe->bitfields, cqe->rss_hash);
872 
873 	/* This is needed in order to enable forwarding support */
874 	qede_set_gro_params(edev, tpa_info->skb, cqe);
875 
876 cons_buf: /* We still need to handle bd_len_list to consume buffers */
877 	if (likely(cqe->bw_ext_bd_len_list[0]))
878 		qede_fill_frag_skb(edev, rxq, cqe->tpa_agg_index,
879 				   le16_to_cpu(cqe->bw_ext_bd_len_list[0]));
880 
881 	if (unlikely(cqe->bw_ext_bd_len_list[1])) {
882 		DP_ERR(edev,
883 		       "Unlikely - got a TPA aggregation with more than one bw_ext_bd_len_list entry in the TPA start\n");
884 		tpa_info->state = QEDE_AGG_STATE_ERROR;
885 	}
886 }
887 
888 #ifdef CONFIG_INET
qede_gro_ip_csum(struct sk_buff * skb)889 static void qede_gro_ip_csum(struct sk_buff *skb)
890 {
891 	const struct iphdr *iph = ip_hdr(skb);
892 	struct tcphdr *th;
893 
894 	skb_set_transport_header(skb, sizeof(struct iphdr));
895 	th = tcp_hdr(skb);
896 
897 	th->check = ~tcp_v4_check(skb->len - skb_transport_offset(skb),
898 				  iph->saddr, iph->daddr, 0);
899 
900 	tcp_gro_complete(skb);
901 }
902 
qede_gro_ipv6_csum(struct sk_buff * skb)903 static void qede_gro_ipv6_csum(struct sk_buff *skb)
904 {
905 	struct ipv6hdr *iph = ipv6_hdr(skb);
906 	struct tcphdr *th;
907 
908 	skb_set_transport_header(skb, sizeof(struct ipv6hdr));
909 	th = tcp_hdr(skb);
910 
911 	th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb),
912 				  &iph->saddr, &iph->daddr, 0);
913 	tcp_gro_complete(skb);
914 }
915 #endif
916 
qede_gro_receive(struct qede_dev * edev,struct qede_fastpath * fp,struct sk_buff * skb,u16 vlan_tag)917 static void qede_gro_receive(struct qede_dev *edev,
918 			     struct qede_fastpath *fp,
919 			     struct sk_buff *skb,
920 			     u16 vlan_tag)
921 {
922 	/* FW can send a single MTU sized packet from gro flow
923 	 * due to aggregation timeout/last segment etc. which
924 	 * is not expected to be a gro packet. If a skb has zero
925 	 * frags then simply push it in the stack as non gso skb.
926 	 */
927 	if (unlikely(!skb->data_len)) {
928 		skb_shinfo(skb)->gso_type = 0;
929 		skb_shinfo(skb)->gso_size = 0;
930 		goto send_skb;
931 	}
932 
933 #ifdef CONFIG_INET
934 	if (skb_shinfo(skb)->gso_size) {
935 		skb_reset_network_header(skb);
936 
937 		switch (skb->protocol) {
938 		case htons(ETH_P_IP):
939 			qede_gro_ip_csum(skb);
940 			break;
941 		case htons(ETH_P_IPV6):
942 			qede_gro_ipv6_csum(skb);
943 			break;
944 		default:
945 			DP_ERR(edev,
946 			       "Error: FW GRO supports only IPv4/IPv6, not 0x%04x\n",
947 			       ntohs(skb->protocol));
948 		}
949 	}
950 #endif
951 
952 send_skb:
953 	skb_record_rx_queue(skb, fp->rxq->rxq_id);
954 	qede_skb_receive(edev, fp, fp->rxq, skb, vlan_tag);
955 }
956 
qede_tpa_cont(struct qede_dev * edev,struct qede_rx_queue * rxq,struct eth_fast_path_rx_tpa_cont_cqe * cqe)957 static inline void qede_tpa_cont(struct qede_dev *edev,
958 				 struct qede_rx_queue *rxq,
959 				 struct eth_fast_path_rx_tpa_cont_cqe *cqe)
960 {
961 	int i;
962 
963 	for (i = 0; cqe->len_list[i]; i++)
964 		qede_fill_frag_skb(edev, rxq, cqe->tpa_agg_index,
965 				   le16_to_cpu(cqe->len_list[i]));
966 
967 	if (unlikely(i > 1))
968 		DP_ERR(edev,
969 		       "Strange - TPA cont with more than a single len_list entry\n");
970 }
971 
qede_tpa_end(struct qede_dev * edev,struct qede_fastpath * fp,struct eth_fast_path_rx_tpa_end_cqe * cqe)972 static int qede_tpa_end(struct qede_dev *edev,
973 			struct qede_fastpath *fp,
974 			struct eth_fast_path_rx_tpa_end_cqe *cqe)
975 {
976 	struct qede_rx_queue *rxq = fp->rxq;
977 	struct qede_agg_info *tpa_info;
978 	struct sk_buff *skb;
979 	int i;
980 
981 	tpa_info = &rxq->tpa_info[cqe->tpa_agg_index];
982 	skb = tpa_info->skb;
983 
984 	if (tpa_info->buffer.page_offset == PAGE_SIZE)
985 		dma_unmap_page(rxq->dev, tpa_info->buffer.mapping,
986 			       PAGE_SIZE, rxq->data_direction);
987 
988 	for (i = 0; cqe->len_list[i]; i++)
989 		qede_fill_frag_skb(edev, rxq, cqe->tpa_agg_index,
990 				   le16_to_cpu(cqe->len_list[i]));
991 	if (unlikely(i > 1))
992 		DP_ERR(edev,
993 		       "Strange - TPA emd with more than a single len_list entry\n");
994 
995 	if (unlikely(tpa_info->state != QEDE_AGG_STATE_START))
996 		goto err;
997 
998 	/* Sanity */
999 	if (unlikely(cqe->num_of_bds != tpa_info->frag_id + 1))
1000 		DP_ERR(edev,
1001 		       "Strange - TPA had %02x BDs, but SKB has only %d frags\n",
1002 		       cqe->num_of_bds, tpa_info->frag_id);
1003 	if (unlikely(skb->len != le16_to_cpu(cqe->total_packet_len)))
1004 		DP_ERR(edev,
1005 		       "Strange - total packet len [cqe] is %4x but SKB has len %04x\n",
1006 		       le16_to_cpu(cqe->total_packet_len), skb->len);
1007 
1008 	/* Finalize the SKB */
1009 	skb->protocol = eth_type_trans(skb, edev->ndev);
1010 	skb->ip_summed = CHECKSUM_UNNECESSARY;
1011 
1012 	/* tcp_gro_complete() will copy NAPI_GRO_CB(skb)->count
1013 	 * to skb_shinfo(skb)->gso_segs
1014 	 */
1015 	NAPI_GRO_CB(skb)->count = le16_to_cpu(cqe->num_of_coalesced_segs);
1016 
1017 	qede_gro_receive(edev, fp, skb, tpa_info->vlan_tag);
1018 
1019 	tpa_info->state = QEDE_AGG_STATE_NONE;
1020 
1021 	return 1;
1022 err:
1023 	tpa_info->state = QEDE_AGG_STATE_NONE;
1024 
1025 	if (tpa_info->tpa_start_fail) {
1026 		qede_reuse_page(rxq, &tpa_info->buffer);
1027 		tpa_info->tpa_start_fail = false;
1028 	}
1029 
1030 	dev_kfree_skb_any(tpa_info->skb);
1031 	tpa_info->skb = NULL;
1032 	return 0;
1033 }
1034 
qede_check_notunn_csum(u16 flag)1035 static u8 qede_check_notunn_csum(u16 flag)
1036 {
1037 	u16 csum_flag = 0;
1038 	u8 csum = 0;
1039 
1040 	if (flag & (PARSING_AND_ERR_FLAGS_L4CHKSMWASCALCULATED_MASK <<
1041 		    PARSING_AND_ERR_FLAGS_L4CHKSMWASCALCULATED_SHIFT)) {
1042 		csum_flag |= PARSING_AND_ERR_FLAGS_L4CHKSMERROR_MASK <<
1043 			     PARSING_AND_ERR_FLAGS_L4CHKSMERROR_SHIFT;
1044 		csum = QEDE_CSUM_UNNECESSARY;
1045 	}
1046 
1047 	csum_flag |= PARSING_AND_ERR_FLAGS_IPHDRERROR_MASK <<
1048 		     PARSING_AND_ERR_FLAGS_IPHDRERROR_SHIFT;
1049 
1050 	if (csum_flag & flag)
1051 		return QEDE_CSUM_ERROR;
1052 
1053 	return csum;
1054 }
1055 
qede_check_csum(u16 flag)1056 static u8 qede_check_csum(u16 flag)
1057 {
1058 	if (!qede_tunn_exist(flag))
1059 		return qede_check_notunn_csum(flag);
1060 	else
1061 		return qede_check_tunn_csum(flag);
1062 }
1063 
qede_pkt_is_ip_fragmented(struct eth_fast_path_rx_reg_cqe * cqe,u16 flag)1064 static bool qede_pkt_is_ip_fragmented(struct eth_fast_path_rx_reg_cqe *cqe,
1065 				      u16 flag)
1066 {
1067 	u8 tun_pars_flg = cqe->tunnel_pars_flags.flags;
1068 
1069 	if ((tun_pars_flg & (ETH_TUNNEL_PARSING_FLAGS_IPV4_FRAGMENT_MASK <<
1070 			     ETH_TUNNEL_PARSING_FLAGS_IPV4_FRAGMENT_SHIFT)) ||
1071 	    (flag & (PARSING_AND_ERR_FLAGS_IPV4FRAG_MASK <<
1072 		     PARSING_AND_ERR_FLAGS_IPV4FRAG_SHIFT)))
1073 		return true;
1074 
1075 	return false;
1076 }
1077 
1078 /* Return true iff packet is to be passed to stack */
qede_rx_xdp(struct qede_dev * edev,struct qede_fastpath * fp,struct qede_rx_queue * rxq,struct bpf_prog * prog,struct sw_rx_data * bd,struct eth_fast_path_rx_reg_cqe * cqe,u16 * data_offset,u16 * len)1079 static bool qede_rx_xdp(struct qede_dev *edev,
1080 			struct qede_fastpath *fp,
1081 			struct qede_rx_queue *rxq,
1082 			struct bpf_prog *prog,
1083 			struct sw_rx_data *bd,
1084 			struct eth_fast_path_rx_reg_cqe *cqe,
1085 			u16 *data_offset, u16 *len)
1086 {
1087 	struct xdp_buff xdp;
1088 	enum xdp_action act;
1089 
1090 	xdp_init_buff(&xdp, rxq->rx_buf_seg_size, &rxq->xdp_rxq);
1091 	xdp_prepare_buff(&xdp, page_address(bd->data), *data_offset,
1092 			 *len, false);
1093 
1094 	act = bpf_prog_run_xdp(prog, &xdp);
1095 
1096 	/* Recalculate, as XDP might have changed the headers */
1097 	*data_offset = xdp.data - xdp.data_hard_start;
1098 	*len = xdp.data_end - xdp.data;
1099 
1100 	if (act == XDP_PASS)
1101 		return true;
1102 
1103 	/* Count number of packets not to be passed to stack */
1104 	rxq->xdp_no_pass++;
1105 
1106 	switch (act) {
1107 	case XDP_TX:
1108 		/* We need the replacement buffer before transmit. */
1109 		if (unlikely(qede_alloc_rx_buffer(rxq, true))) {
1110 			qede_recycle_rx_bd_ring(rxq, 1);
1111 
1112 			trace_xdp_exception(edev->ndev, prog, act);
1113 			break;
1114 		}
1115 
1116 		/* Now if there's a transmission problem, we'd still have to
1117 		 * throw current buffer, as replacement was already allocated.
1118 		 */
1119 		if (unlikely(qede_xdp_xmit(fp->xdp_tx, bd->mapping,
1120 					   *data_offset, *len, bd->data,
1121 					   NULL))) {
1122 			dma_unmap_page(rxq->dev, bd->mapping, PAGE_SIZE,
1123 				       rxq->data_direction);
1124 			__free_page(bd->data);
1125 
1126 			trace_xdp_exception(edev->ndev, prog, act);
1127 		} else {
1128 			dma_sync_single_for_device(rxq->dev,
1129 						   bd->mapping + *data_offset,
1130 						   *len, rxq->data_direction);
1131 			fp->xdp_xmit |= QEDE_XDP_TX;
1132 		}
1133 
1134 		/* Regardless, we've consumed an Rx BD */
1135 		qede_rx_bd_ring_consume(rxq);
1136 		break;
1137 	case XDP_REDIRECT:
1138 		/* We need the replacement buffer before transmit. */
1139 		if (unlikely(qede_alloc_rx_buffer(rxq, true))) {
1140 			qede_recycle_rx_bd_ring(rxq, 1);
1141 
1142 			trace_xdp_exception(edev->ndev, prog, act);
1143 			break;
1144 		}
1145 
1146 		dma_unmap_page(rxq->dev, bd->mapping, PAGE_SIZE,
1147 			       rxq->data_direction);
1148 
1149 		if (unlikely(xdp_do_redirect(edev->ndev, &xdp, prog)))
1150 			DP_NOTICE(edev, "Failed to redirect the packet\n");
1151 		else
1152 			fp->xdp_xmit |= QEDE_XDP_REDIRECT;
1153 
1154 		qede_rx_bd_ring_consume(rxq);
1155 		break;
1156 	default:
1157 		bpf_warn_invalid_xdp_action(edev->ndev, prog, act);
1158 		fallthrough;
1159 	case XDP_ABORTED:
1160 		trace_xdp_exception(edev->ndev, prog, act);
1161 		fallthrough;
1162 	case XDP_DROP:
1163 		qede_recycle_rx_bd_ring(rxq, cqe->bd_num);
1164 	}
1165 
1166 	return false;
1167 }
1168 
qede_rx_build_jumbo(struct qede_dev * edev,struct qede_rx_queue * rxq,struct sk_buff * skb,struct eth_fast_path_rx_reg_cqe * cqe,u16 first_bd_len)1169 static int qede_rx_build_jumbo(struct qede_dev *edev,
1170 			       struct qede_rx_queue *rxq,
1171 			       struct sk_buff *skb,
1172 			       struct eth_fast_path_rx_reg_cqe *cqe,
1173 			       u16 first_bd_len)
1174 {
1175 	u16 pkt_len = le16_to_cpu(cqe->pkt_len);
1176 	struct sw_rx_data *bd;
1177 	u16 bd_cons_idx;
1178 	u8 num_frags;
1179 
1180 	pkt_len -= first_bd_len;
1181 
1182 	/* We've already used one BD for the SKB. Now take care of the rest */
1183 	for (num_frags = cqe->bd_num - 1; num_frags > 0; num_frags--) {
1184 		u16 cur_size = pkt_len > rxq->rx_buf_size ? rxq->rx_buf_size :
1185 		    pkt_len;
1186 
1187 		if (unlikely(!cur_size)) {
1188 			DP_ERR(edev,
1189 			       "Still got %d BDs for mapping jumbo, but length became 0\n",
1190 			       num_frags);
1191 			goto out;
1192 		}
1193 
1194 		/* We need a replacement buffer for each BD */
1195 		if (unlikely(qede_alloc_rx_buffer(rxq, true)))
1196 			goto out;
1197 
1198 		/* Now that we've allocated the replacement buffer,
1199 		 * we can safely consume the next BD and map it to the SKB.
1200 		 */
1201 		bd_cons_idx = rxq->sw_rx_cons & NUM_RX_BDS_MAX;
1202 		bd = &rxq->sw_rx_ring[bd_cons_idx];
1203 		qede_rx_bd_ring_consume(rxq);
1204 
1205 		dma_unmap_page(rxq->dev, bd->mapping,
1206 			       PAGE_SIZE, DMA_FROM_DEVICE);
1207 
1208 		skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, bd->data,
1209 				rxq->rx_headroom, cur_size, PAGE_SIZE);
1210 
1211 		pkt_len -= cur_size;
1212 	}
1213 
1214 	if (unlikely(pkt_len))
1215 		DP_ERR(edev,
1216 		       "Mapped all BDs of jumbo, but still have %d bytes\n",
1217 		       pkt_len);
1218 
1219 out:
1220 	return num_frags;
1221 }
1222 
qede_rx_process_tpa_cqe(struct qede_dev * edev,struct qede_fastpath * fp,struct qede_rx_queue * rxq,union eth_rx_cqe * cqe,enum eth_rx_cqe_type type)1223 static int qede_rx_process_tpa_cqe(struct qede_dev *edev,
1224 				   struct qede_fastpath *fp,
1225 				   struct qede_rx_queue *rxq,
1226 				   union eth_rx_cqe *cqe,
1227 				   enum eth_rx_cqe_type type)
1228 {
1229 	switch (type) {
1230 	case ETH_RX_CQE_TYPE_TPA_START:
1231 		qede_tpa_start(edev, rxq, &cqe->fast_path_tpa_start);
1232 		return 0;
1233 	case ETH_RX_CQE_TYPE_TPA_CONT:
1234 		qede_tpa_cont(edev, rxq, &cqe->fast_path_tpa_cont);
1235 		return 0;
1236 	case ETH_RX_CQE_TYPE_TPA_END:
1237 		return qede_tpa_end(edev, fp, &cqe->fast_path_tpa_end);
1238 	default:
1239 		return 0;
1240 	}
1241 }
1242 
qede_rx_process_cqe(struct qede_dev * edev,struct qede_fastpath * fp,struct qede_rx_queue * rxq)1243 static int qede_rx_process_cqe(struct qede_dev *edev,
1244 			       struct qede_fastpath *fp,
1245 			       struct qede_rx_queue *rxq)
1246 {
1247 	struct bpf_prog *xdp_prog = READ_ONCE(rxq->xdp_prog);
1248 	struct eth_fast_path_rx_reg_cqe *fp_cqe;
1249 	u16 len, pad, bd_cons_idx, parse_flag;
1250 	enum eth_rx_cqe_type cqe_type;
1251 	union eth_rx_cqe *cqe;
1252 	struct sw_rx_data *bd;
1253 	struct sk_buff *skb;
1254 	__le16 flags;
1255 	u8 csum_flag;
1256 
1257 	/* Get the CQE from the completion ring */
1258 	cqe = (union eth_rx_cqe *)qed_chain_consume(&rxq->rx_comp_ring);
1259 	cqe_type = cqe->fast_path_regular.type;
1260 
1261 	/* Process an unlikely slowpath event */
1262 	if (unlikely(cqe_type == ETH_RX_CQE_TYPE_SLOW_PATH)) {
1263 		struct eth_slow_path_rx_cqe *sp_cqe;
1264 
1265 		sp_cqe = (struct eth_slow_path_rx_cqe *)cqe;
1266 		edev->ops->eth_cqe_completion(edev->cdev, fp->id, sp_cqe);
1267 		return 0;
1268 	}
1269 
1270 	/* Handle TPA cqes */
1271 	if (cqe_type != ETH_RX_CQE_TYPE_REGULAR)
1272 		return qede_rx_process_tpa_cqe(edev, fp, rxq, cqe, cqe_type);
1273 
1274 	/* Get the data from the SW ring; Consume it only after it's evident
1275 	 * we wouldn't recycle it.
1276 	 */
1277 	bd_cons_idx = rxq->sw_rx_cons & NUM_RX_BDS_MAX;
1278 	bd = &rxq->sw_rx_ring[bd_cons_idx];
1279 
1280 	fp_cqe = &cqe->fast_path_regular;
1281 	len = le16_to_cpu(fp_cqe->len_on_first_bd);
1282 	pad = fp_cqe->placement_offset + rxq->rx_headroom;
1283 
1284 	/* Run eBPF program if one is attached */
1285 	if (xdp_prog)
1286 		if (!qede_rx_xdp(edev, fp, rxq, xdp_prog, bd, fp_cqe,
1287 				 &pad, &len))
1288 			return 0;
1289 
1290 	/* If this is an error packet then drop it */
1291 	flags = cqe->fast_path_regular.pars_flags.flags;
1292 	parse_flag = le16_to_cpu(flags);
1293 
1294 	csum_flag = qede_check_csum(parse_flag);
1295 	if (unlikely(csum_flag == QEDE_CSUM_ERROR)) {
1296 		if (qede_pkt_is_ip_fragmented(fp_cqe, parse_flag))
1297 			rxq->rx_ip_frags++;
1298 		else
1299 			rxq->rx_hw_errors++;
1300 	}
1301 
1302 	/* Basic validation passed; Need to prepare an SKB. This would also
1303 	 * guarantee to finally consume the first BD upon success.
1304 	 */
1305 	skb = qede_rx_build_skb(edev, rxq, bd, len, pad);
1306 	if (!skb) {
1307 		rxq->rx_alloc_errors++;
1308 		qede_recycle_rx_bd_ring(rxq, fp_cqe->bd_num);
1309 		return 0;
1310 	}
1311 
1312 	/* In case of Jumbo packet, several PAGE_SIZEd buffers will be pointed
1313 	 * by a single cqe.
1314 	 */
1315 	if (fp_cqe->bd_num > 1) {
1316 		u16 unmapped_frags = qede_rx_build_jumbo(edev, rxq, skb,
1317 							 fp_cqe, len);
1318 
1319 		if (unlikely(unmapped_frags > 0)) {
1320 			qede_recycle_rx_bd_ring(rxq, unmapped_frags);
1321 			dev_kfree_skb_any(skb);
1322 			return 0;
1323 		}
1324 	}
1325 
1326 	/* The SKB contains all the data. Now prepare meta-magic */
1327 	skb->protocol = eth_type_trans(skb, edev->ndev);
1328 	qede_get_rxhash(skb, fp_cqe->bitfields, fp_cqe->rss_hash);
1329 	qede_set_skb_csum(skb, csum_flag);
1330 	skb_record_rx_queue(skb, rxq->rxq_id);
1331 	qede_ptp_record_rx_ts(edev, cqe, skb);
1332 
1333 	/* SKB is prepared - pass it to stack */
1334 	qede_skb_receive(edev, fp, rxq, skb, le16_to_cpu(fp_cqe->vlan_tag));
1335 
1336 	return 1;
1337 }
1338 
qede_rx_int(struct qede_fastpath * fp,int budget)1339 static int qede_rx_int(struct qede_fastpath *fp, int budget)
1340 {
1341 	struct qede_rx_queue *rxq = fp->rxq;
1342 	struct qede_dev *edev = fp->edev;
1343 	int work_done = 0, rcv_pkts = 0;
1344 	u16 hw_comp_cons, sw_comp_cons;
1345 
1346 	hw_comp_cons = le16_to_cpu(*rxq->hw_cons_ptr);
1347 	sw_comp_cons = qed_chain_get_cons_idx(&rxq->rx_comp_ring);
1348 
1349 	/* Memory barrier to prevent the CPU from doing speculative reads of CQE
1350 	 * / BD in the while-loop before reading hw_comp_cons. If the CQE is
1351 	 * read before it is written by FW, then FW writes CQE and SB, and then
1352 	 * the CPU reads the hw_comp_cons, it will use an old CQE.
1353 	 */
1354 	rmb();
1355 
1356 	/* Loop to complete all indicated BDs */
1357 	while ((sw_comp_cons != hw_comp_cons) && (work_done < budget)) {
1358 		rcv_pkts += qede_rx_process_cqe(edev, fp, rxq);
1359 		qed_chain_recycle_consumed(&rxq->rx_comp_ring);
1360 		sw_comp_cons = qed_chain_get_cons_idx(&rxq->rx_comp_ring);
1361 		work_done++;
1362 	}
1363 
1364 	rxq->rcv_pkts += rcv_pkts;
1365 
1366 	/* Allocate replacement buffers */
1367 	while (rxq->num_rx_buffers - rxq->filled_buffers)
1368 		if (qede_alloc_rx_buffer(rxq, false))
1369 			break;
1370 
1371 	/* Update producers */
1372 	qede_update_rx_prod(edev, rxq);
1373 
1374 	return work_done;
1375 }
1376 
qede_poll_is_more_work(struct qede_fastpath * fp)1377 static bool qede_poll_is_more_work(struct qede_fastpath *fp)
1378 {
1379 	qed_sb_update_sb_idx(fp->sb_info);
1380 
1381 	/* *_has_*_work() reads the status block, thus we need to ensure that
1382 	 * status block indices have been actually read (qed_sb_update_sb_idx)
1383 	 * prior to this check (*_has_*_work) so that we won't write the
1384 	 * "newer" value of the status block to HW (if there was a DMA right
1385 	 * after qede_has_rx_work and if there is no rmb, the memory reading
1386 	 * (qed_sb_update_sb_idx) may be postponed to right before *_ack_sb).
1387 	 * In this case there will never be another interrupt until there is
1388 	 * another update of the status block, while there is still unhandled
1389 	 * work.
1390 	 */
1391 	rmb();
1392 
1393 	if (likely(fp->type & QEDE_FASTPATH_RX))
1394 		if (qede_has_rx_work(fp->rxq))
1395 			return true;
1396 
1397 	if (fp->type & QEDE_FASTPATH_XDP)
1398 		if (qede_txq_has_work(fp->xdp_tx))
1399 			return true;
1400 
1401 	if (likely(fp->type & QEDE_FASTPATH_TX)) {
1402 		int cos;
1403 
1404 		for_each_cos_in_txq(fp->edev, cos) {
1405 			if (qede_txq_has_work(&fp->txq[cos]))
1406 				return true;
1407 		}
1408 	}
1409 
1410 	return false;
1411 }
1412 
1413 /*********************
1414  * NDO & API related *
1415  *********************/
qede_poll(struct napi_struct * napi,int budget)1416 int qede_poll(struct napi_struct *napi, int budget)
1417 {
1418 	struct qede_fastpath *fp = container_of(napi, struct qede_fastpath,
1419 						napi);
1420 	struct qede_dev *edev = fp->edev;
1421 	int rx_work_done = 0;
1422 	u16 xdp_prod;
1423 
1424 	fp->xdp_xmit = 0;
1425 
1426 	if (likely(fp->type & QEDE_FASTPATH_TX)) {
1427 		int cos;
1428 
1429 		for_each_cos_in_txq(fp->edev, cos) {
1430 			if (qede_txq_has_work(&fp->txq[cos]))
1431 				qede_tx_int(edev, &fp->txq[cos]);
1432 		}
1433 	}
1434 
1435 	if ((fp->type & QEDE_FASTPATH_XDP) && qede_txq_has_work(fp->xdp_tx))
1436 		qede_xdp_tx_int(edev, fp->xdp_tx);
1437 
1438 	rx_work_done = (likely(fp->type & QEDE_FASTPATH_RX) &&
1439 			qede_has_rx_work(fp->rxq)) ?
1440 			qede_rx_int(fp, budget) : 0;
1441 
1442 	if (fp->xdp_xmit & QEDE_XDP_REDIRECT)
1443 		xdp_do_flush();
1444 
1445 	/* Handle case where we are called by netpoll with a budget of 0 */
1446 	if (rx_work_done < budget || !budget) {
1447 		if (!qede_poll_is_more_work(fp)) {
1448 			napi_complete_done(napi, rx_work_done);
1449 
1450 			/* Update and reenable interrupts */
1451 			qed_sb_ack(fp->sb_info, IGU_INT_ENABLE, 1);
1452 		} else {
1453 			rx_work_done = budget;
1454 		}
1455 	}
1456 
1457 	if (fp->xdp_xmit & QEDE_XDP_TX) {
1458 		xdp_prod = qed_chain_get_prod_idx(&fp->xdp_tx->tx_pbl);
1459 
1460 		fp->xdp_tx->tx_db.data.bd_prod = cpu_to_le16(xdp_prod);
1461 		qede_update_tx_producer(fp->xdp_tx);
1462 	}
1463 
1464 	return rx_work_done;
1465 }
1466 
qede_msix_fp_int(int irq,void * fp_cookie)1467 irqreturn_t qede_msix_fp_int(int irq, void *fp_cookie)
1468 {
1469 	struct qede_fastpath *fp = fp_cookie;
1470 
1471 	qed_sb_ack(fp->sb_info, IGU_INT_DISABLE, 0 /*do not update*/);
1472 
1473 	napi_schedule_irqoff(&fp->napi);
1474 	return IRQ_HANDLED;
1475 }
1476 
1477 /* Main transmit function */
qede_start_xmit(struct sk_buff * skb,struct net_device * ndev)1478 netdev_tx_t qede_start_xmit(struct sk_buff *skb, struct net_device *ndev)
1479 {
1480 	struct qede_dev *edev = netdev_priv(ndev);
1481 	struct netdev_queue *netdev_txq;
1482 	struct qede_tx_queue *txq;
1483 	struct eth_tx_1st_bd *first_bd;
1484 	struct eth_tx_2nd_bd *second_bd = NULL;
1485 	struct eth_tx_3rd_bd *third_bd = NULL;
1486 	struct eth_tx_bd *tx_data_bd = NULL;
1487 	u16 txq_index, val = 0;
1488 	u8 nbd = 0;
1489 	dma_addr_t mapping;
1490 	int rc, frag_idx = 0, ipv6_ext = 0;
1491 	u8 xmit_type;
1492 	u16 idx;
1493 	u16 hlen;
1494 	bool data_split = false;
1495 
1496 	/* Get tx-queue context and netdev index */
1497 	txq_index = skb_get_queue_mapping(skb);
1498 	WARN_ON(txq_index >= QEDE_TSS_COUNT(edev) * edev->dev_info.num_tc);
1499 	txq = QEDE_NDEV_TXQ_ID_TO_TXQ(edev, txq_index);
1500 	netdev_txq = netdev_get_tx_queue(ndev, txq_index);
1501 
1502 	WARN_ON(qed_chain_get_elem_left(&txq->tx_pbl) < (MAX_SKB_FRAGS + 1));
1503 
1504 	xmit_type = qede_xmit_type(skb, &ipv6_ext);
1505 
1506 #if ((MAX_SKB_FRAGS + 2) > ETH_TX_MAX_BDS_PER_NON_LSO_PACKET)
1507 	if (qede_pkt_req_lin(skb, xmit_type)) {
1508 		if (skb_linearize(skb)) {
1509 			txq->tx_mem_alloc_err++;
1510 
1511 			dev_kfree_skb_any(skb);
1512 			return NETDEV_TX_OK;
1513 		}
1514 	}
1515 #endif
1516 
1517 	/* Fill the entry in the SW ring and the BDs in the FW ring */
1518 	idx = txq->sw_tx_prod;
1519 	txq->sw_tx_ring.skbs[idx].skb = skb;
1520 	first_bd = (struct eth_tx_1st_bd *)
1521 		   qed_chain_produce(&txq->tx_pbl);
1522 	memset(first_bd, 0, sizeof(*first_bd));
1523 	first_bd->data.bd_flags.bitfields =
1524 		1 << ETH_TX_1ST_BD_FLAGS_START_BD_SHIFT;
1525 
1526 	if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))
1527 		qede_ptp_tx_ts(edev, skb);
1528 
1529 	/* Map skb linear data for DMA and set in the first BD */
1530 	mapping = dma_map_single(txq->dev, skb->data,
1531 				 skb_headlen(skb), DMA_TO_DEVICE);
1532 	if (unlikely(dma_mapping_error(txq->dev, mapping))) {
1533 		DP_NOTICE(edev, "SKB mapping failed\n");
1534 		qede_free_failed_tx_pkt(txq, first_bd, 0, false);
1535 		qede_update_tx_producer(txq);
1536 		return NETDEV_TX_OK;
1537 	}
1538 	nbd++;
1539 	BD_SET_UNMAP_ADDR_LEN(first_bd, mapping, skb_headlen(skb));
1540 
1541 	/* In case there is IPv6 with extension headers or LSO we need 2nd and
1542 	 * 3rd BDs.
1543 	 */
1544 	if (unlikely((xmit_type & XMIT_LSO) | ipv6_ext)) {
1545 		second_bd = (struct eth_tx_2nd_bd *)
1546 			qed_chain_produce(&txq->tx_pbl);
1547 		memset(second_bd, 0, sizeof(*second_bd));
1548 
1549 		nbd++;
1550 		third_bd = (struct eth_tx_3rd_bd *)
1551 			qed_chain_produce(&txq->tx_pbl);
1552 		memset(third_bd, 0, sizeof(*third_bd));
1553 
1554 		nbd++;
1555 		/* We need to fill in additional data in second_bd... */
1556 		tx_data_bd = (struct eth_tx_bd *)second_bd;
1557 	}
1558 
1559 	if (skb_vlan_tag_present(skb)) {
1560 		first_bd->data.vlan = cpu_to_le16(skb_vlan_tag_get(skb));
1561 		first_bd->data.bd_flags.bitfields |=
1562 			1 << ETH_TX_1ST_BD_FLAGS_VLAN_INSERTION_SHIFT;
1563 	}
1564 
1565 	/* Fill the parsing flags & params according to the requested offload */
1566 	if (xmit_type & XMIT_L4_CSUM) {
1567 		/* We don't re-calculate IP checksum as it is already done by
1568 		 * the upper stack
1569 		 */
1570 		first_bd->data.bd_flags.bitfields |=
1571 			1 << ETH_TX_1ST_BD_FLAGS_L4_CSUM_SHIFT;
1572 
1573 		if (xmit_type & XMIT_ENC) {
1574 			first_bd->data.bd_flags.bitfields |=
1575 				1 << ETH_TX_1ST_BD_FLAGS_IP_CSUM_SHIFT;
1576 
1577 			val |= (1 << ETH_TX_DATA_1ST_BD_TUNN_FLAG_SHIFT);
1578 		}
1579 
1580 		/* Legacy FW had flipped behavior in regard to this bit -
1581 		 * I.e., needed to set to prevent FW from touching encapsulated
1582 		 * packets when it didn't need to.
1583 		 */
1584 		if (unlikely(txq->is_legacy))
1585 			val ^= (1 << ETH_TX_DATA_1ST_BD_TUNN_FLAG_SHIFT);
1586 
1587 		/* If the packet is IPv6 with extension header, indicate that
1588 		 * to FW and pass few params, since the device cracker doesn't
1589 		 * support parsing IPv6 with extension header/s.
1590 		 */
1591 		if (unlikely(ipv6_ext))
1592 			qede_set_params_for_ipv6_ext(skb, second_bd, third_bd);
1593 	}
1594 
1595 	if (xmit_type & XMIT_LSO) {
1596 		first_bd->data.bd_flags.bitfields |=
1597 			(1 << ETH_TX_1ST_BD_FLAGS_LSO_SHIFT);
1598 		third_bd->data.lso_mss =
1599 			cpu_to_le16(skb_shinfo(skb)->gso_size);
1600 
1601 		if (unlikely(xmit_type & XMIT_ENC)) {
1602 			first_bd->data.bd_flags.bitfields |=
1603 				1 << ETH_TX_1ST_BD_FLAGS_TUNN_IP_CSUM_SHIFT;
1604 
1605 			if (xmit_type & XMIT_ENC_GSO_L4_CSUM) {
1606 				u8 tmp = ETH_TX_1ST_BD_FLAGS_TUNN_L4_CSUM_SHIFT;
1607 
1608 				first_bd->data.bd_flags.bitfields |= 1 << tmp;
1609 			}
1610 			hlen = qede_get_skb_hlen(skb, true);
1611 		} else {
1612 			first_bd->data.bd_flags.bitfields |=
1613 				1 << ETH_TX_1ST_BD_FLAGS_IP_CSUM_SHIFT;
1614 			hlen = qede_get_skb_hlen(skb, false);
1615 		}
1616 
1617 		/* @@@TBD - if will not be removed need to check */
1618 		third_bd->data.bitfields |=
1619 			cpu_to_le16(1 << ETH_TX_DATA_3RD_BD_HDR_NBD_SHIFT);
1620 
1621 		/* Make life easier for FW guys who can't deal with header and
1622 		 * data on same BD. If we need to split, use the second bd...
1623 		 */
1624 		if (unlikely(skb_headlen(skb) > hlen)) {
1625 			DP_VERBOSE(edev, NETIF_MSG_TX_QUEUED,
1626 				   "TSO split header size is %d (%x:%x)\n",
1627 				   first_bd->nbytes, first_bd->addr.hi,
1628 				   first_bd->addr.lo);
1629 
1630 			mapping = HILO_U64(le32_to_cpu(first_bd->addr.hi),
1631 					   le32_to_cpu(first_bd->addr.lo)) +
1632 					   hlen;
1633 
1634 			BD_SET_UNMAP_ADDR_LEN(tx_data_bd, mapping,
1635 					      le16_to_cpu(first_bd->nbytes) -
1636 					      hlen);
1637 
1638 			/* this marks the BD as one that has no
1639 			 * individual mapping
1640 			 */
1641 			txq->sw_tx_ring.skbs[idx].flags |= QEDE_TSO_SPLIT_BD;
1642 
1643 			first_bd->nbytes = cpu_to_le16(hlen);
1644 
1645 			tx_data_bd = (struct eth_tx_bd *)third_bd;
1646 			data_split = true;
1647 		}
1648 	} else {
1649 		if (unlikely(skb->len > ETH_TX_MAX_NON_LSO_PKT_LEN)) {
1650 			DP_ERR(edev, "Unexpected non LSO skb length = 0x%x\n", skb->len);
1651 			qede_free_failed_tx_pkt(txq, first_bd, 0, false);
1652 			qede_update_tx_producer(txq);
1653 			return NETDEV_TX_OK;
1654 		}
1655 
1656 		val |= ((skb->len & ETH_TX_DATA_1ST_BD_PKT_LEN_MASK) <<
1657 			 ETH_TX_DATA_1ST_BD_PKT_LEN_SHIFT);
1658 	}
1659 
1660 	first_bd->data.bitfields = cpu_to_le16(val);
1661 
1662 	/* Handle fragmented skb */
1663 	/* special handle for frags inside 2nd and 3rd bds.. */
1664 	while (tx_data_bd && frag_idx < skb_shinfo(skb)->nr_frags) {
1665 		rc = map_frag_to_bd(txq,
1666 				    &skb_shinfo(skb)->frags[frag_idx],
1667 				    tx_data_bd);
1668 		if (rc) {
1669 			qede_free_failed_tx_pkt(txq, first_bd, nbd, data_split);
1670 			qede_update_tx_producer(txq);
1671 			return NETDEV_TX_OK;
1672 		}
1673 
1674 		if (tx_data_bd == (struct eth_tx_bd *)second_bd)
1675 			tx_data_bd = (struct eth_tx_bd *)third_bd;
1676 		else
1677 			tx_data_bd = NULL;
1678 
1679 		frag_idx++;
1680 	}
1681 
1682 	/* map last frags into 4th, 5th .... */
1683 	for (; frag_idx < skb_shinfo(skb)->nr_frags; frag_idx++, nbd++) {
1684 		tx_data_bd = (struct eth_tx_bd *)
1685 			     qed_chain_produce(&txq->tx_pbl);
1686 
1687 		memset(tx_data_bd, 0, sizeof(*tx_data_bd));
1688 
1689 		rc = map_frag_to_bd(txq,
1690 				    &skb_shinfo(skb)->frags[frag_idx],
1691 				    tx_data_bd);
1692 		if (rc) {
1693 			qede_free_failed_tx_pkt(txq, first_bd, nbd, data_split);
1694 			qede_update_tx_producer(txq);
1695 			return NETDEV_TX_OK;
1696 		}
1697 	}
1698 
1699 	/* update the first BD with the actual num BDs */
1700 	first_bd->data.nbds = nbd;
1701 
1702 	netdev_tx_sent_queue(netdev_txq, skb->len);
1703 
1704 	skb_tx_timestamp(skb);
1705 
1706 	/* Advance packet producer only before sending the packet since mapping
1707 	 * of pages may fail.
1708 	 */
1709 	txq->sw_tx_prod = (txq->sw_tx_prod + 1) % txq->num_tx_buffers;
1710 
1711 	/* 'next page' entries are counted in the producer value */
1712 	txq->tx_db.data.bd_prod =
1713 		cpu_to_le16(qed_chain_get_prod_idx(&txq->tx_pbl));
1714 
1715 	if (!netdev_xmit_more() || netif_xmit_stopped(netdev_txq))
1716 		qede_update_tx_producer(txq);
1717 
1718 	if (unlikely(qed_chain_get_elem_left(&txq->tx_pbl)
1719 		      < (MAX_SKB_FRAGS + 1))) {
1720 		if (netdev_xmit_more())
1721 			qede_update_tx_producer(txq);
1722 
1723 		netif_tx_stop_queue(netdev_txq);
1724 		txq->stopped_cnt++;
1725 		DP_VERBOSE(edev, NETIF_MSG_TX_QUEUED,
1726 			   "Stop queue was called\n");
1727 		/* paired memory barrier is in qede_tx_int(), we have to keep
1728 		 * ordering of set_bit() in netif_tx_stop_queue() and read of
1729 		 * fp->bd_tx_cons
1730 		 */
1731 		smp_mb();
1732 
1733 		if ((qed_chain_get_elem_left(&txq->tx_pbl) >=
1734 		     (MAX_SKB_FRAGS + 1)) &&
1735 		    (edev->state == QEDE_STATE_OPEN)) {
1736 			netif_tx_wake_queue(netdev_txq);
1737 			DP_VERBOSE(edev, NETIF_MSG_TX_QUEUED,
1738 				   "Wake queue was called\n");
1739 		}
1740 	}
1741 
1742 	return NETDEV_TX_OK;
1743 }
1744 
qede_select_queue(struct net_device * dev,struct sk_buff * skb,struct net_device * sb_dev)1745 u16 qede_select_queue(struct net_device *dev, struct sk_buff *skb,
1746 		      struct net_device *sb_dev)
1747 {
1748 	struct qede_dev *edev = netdev_priv(dev);
1749 	int total_txq;
1750 
1751 	total_txq = QEDE_TSS_COUNT(edev) * edev->dev_info.num_tc;
1752 
1753 	return QEDE_TSS_COUNT(edev) ?
1754 		netdev_pick_tx(dev, skb, NULL) % total_txq :  0;
1755 }
1756 
1757 /* 8B udp header + 8B base tunnel header + 32B option length */
1758 #define QEDE_MAX_TUN_HDR_LEN 48
1759 
qede_features_check(struct sk_buff * skb,struct net_device * dev,netdev_features_t features)1760 netdev_features_t qede_features_check(struct sk_buff *skb,
1761 				      struct net_device *dev,
1762 				      netdev_features_t features)
1763 {
1764 	if (skb->encapsulation) {
1765 		u8 l4_proto = 0;
1766 
1767 		switch (vlan_get_protocol(skb)) {
1768 		case htons(ETH_P_IP):
1769 			l4_proto = ip_hdr(skb)->protocol;
1770 			break;
1771 		case htons(ETH_P_IPV6):
1772 			l4_proto = ipv6_hdr(skb)->nexthdr;
1773 			break;
1774 		default:
1775 			return features;
1776 		}
1777 
1778 		/* Disable offloads for geneve tunnels, as HW can't parse
1779 		 * the geneve header which has option length greater than 32b
1780 		 * and disable offloads for the ports which are not offloaded.
1781 		 */
1782 		if (l4_proto == IPPROTO_UDP) {
1783 			struct qede_dev *edev = netdev_priv(dev);
1784 			u16 hdrlen, vxln_port, gnv_port;
1785 
1786 			hdrlen = QEDE_MAX_TUN_HDR_LEN;
1787 			vxln_port = edev->vxlan_dst_port;
1788 			gnv_port = edev->geneve_dst_port;
1789 
1790 			if ((skb_inner_mac_header(skb) -
1791 			     skb_transport_header(skb)) > hdrlen ||
1792 			     (ntohs(udp_hdr(skb)->dest) != vxln_port &&
1793 			      ntohs(udp_hdr(skb)->dest) != gnv_port))
1794 				return features & ~(NETIF_F_CSUM_MASK |
1795 						    NETIF_F_GSO_MASK);
1796 		} else if (l4_proto == IPPROTO_IPIP) {
1797 			/* IPIP tunnels are unknown to the device or at least unsupported natively,
1798 			 * offloads for them can't be done trivially, so disable them for such skb.
1799 			 */
1800 			return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
1801 		}
1802 	}
1803 
1804 	return features;
1805 }
1806