1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * nxpwifi: 802.11n Aggregation
4 *
5 * Copyright 2011-2024 NXP
6 */
7
8 #include "cfg.h"
9 #include "util.h"
10 #include "fw.h"
11 #include "main.h"
12 #include "wmm.h"
13 #include "11n.h"
14 #include "11n_aggr.h"
15
16 /*
17 * Build an AMSDU subframe for aggregation, with fields
18 * (DA | SA | Length | SNAP header | MSDU), and compute padding
19 * to align the subframe to a 4-byte boundary.
20 */
nxpwifi_11n_form_amsdu_pkt(struct sk_buff * skb_aggr,struct sk_buff * skb_src,int * pad)21 static int nxpwifi_11n_form_amsdu_pkt(struct sk_buff *skb_aggr,
22 struct sk_buff *skb_src, int *pad)
23
24 {
25 int dt_offset;
26 struct rfc_1042_hdr snap = {
27 0xaa, /* LLC DSAP */
28 0xaa, /* LLC SSAP */
29 0x03, /* LLC CTRL */
30 {0x00, 0x00, 0x00}, /* SNAP OUI */
31 0x0000 /* SNAP type */
32 /* This field will be overwritten later with ethertype */
33 };
34 struct tx_packet_hdr *tx_header;
35
36 tx_header = skb_put(skb_aggr, sizeof(*tx_header));
37
38 /* Copy DA and SA */
39 dt_offset = 2 * ETH_ALEN;
40 memcpy(&tx_header->eth803_hdr, skb_src->data, dt_offset);
41
42 /* Copy SNAP header */
43 snap.snap_type = ((struct ethhdr *)skb_src->data)->h_proto;
44
45 dt_offset += sizeof(__be16);
46
47 memcpy(&tx_header->rfc1042_hdr, &snap, sizeof(struct rfc_1042_hdr));
48
49 skb_pull(skb_src, dt_offset);
50
51 /* Update Length field */
52 tx_header->eth803_hdr.h_proto = htons(skb_src->len + LLC_SNAP_LEN);
53
54 /* Add payload */
55 skb_put_data(skb_aggr, skb_src->data, skb_src->len);
56
57 /* Add padding for new MSDU to start from 4 byte boundary */
58 *pad = (4 - ((unsigned long)skb_aggr->tail & 0x3)) % 4;
59
60 return skb_aggr->len + *pad;
61 }
62
63 /*
64 * Adds TxPD to AMSDU header. Each AMSDU packet will contain one TxPD at the
65 * beginning, followed by multiple AMSDU subframes
66 */
67 static void
nxpwifi_11n_form_amsdu_txpd(struct nxpwifi_private * priv,struct sk_buff * skb)68 nxpwifi_11n_form_amsdu_txpd(struct nxpwifi_private *priv,
69 struct sk_buff *skb)
70 {
71 struct txpd *local_tx_pd;
72
73 skb_push(skb, sizeof(*local_tx_pd));
74
75 local_tx_pd = (struct txpd *)skb->data;
76 memset(local_tx_pd, 0, sizeof(struct txpd));
77
78 /* Original priority has been overwritten */
79 local_tx_pd->priority = (u8)skb->priority;
80 local_tx_pd->pkt_delay_2ms =
81 nxpwifi_wmm_compute_drv_pkt_delay(priv, skb);
82 local_tx_pd->bss_num = priv->bss_num;
83 local_tx_pd->bss_type = priv->bss_type;
84 /* Always zero as the data is followed by struct txpd */
85 local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd));
86 local_tx_pd->tx_pkt_type = cpu_to_le16(PKT_TYPE_AMSDU);
87 local_tx_pd->tx_pkt_length = cpu_to_le16(skb->len -
88 sizeof(*local_tx_pd));
89
90 if (local_tx_pd->tx_control == 0)
91 /* TxCtrl set by user or default */
92 local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
93
94 if (GET_BSS_ROLE(priv) == NXPWIFI_BSS_ROLE_STA &&
95 priv->adapter->pps_uapsd_mode) {
96 if (nxpwifi_check_last_packet_indication(priv)) {
97 priv->adapter->tx_lock_flag = true;
98 local_tx_pd->flags =
99 NXPWIFI_TxPD_POWER_MGMT_LAST_PACKET;
100 }
101 }
102 }
103
104 /*
105 * Build an aggregated MSDU packet by encapsulating buffers from the RA
106 * list as AMSDU subframes and concatenating them. A TxPD is prepended
107 * before transmission to form the final AMSDU packet.
108 */
109 int
nxpwifi_11n_aggregate_pkt(struct nxpwifi_private * priv,struct nxpwifi_ra_list_tbl * pra_list,int ptrindex)110 nxpwifi_11n_aggregate_pkt(struct nxpwifi_private *priv,
111 struct nxpwifi_ra_list_tbl *pra_list,
112 int ptrindex)
113 __releases(&priv->wmm.ra_list_spinlock)
114 {
115 struct nxpwifi_adapter *adapter = priv->adapter;
116 struct sk_buff *skb_aggr, *skb_src;
117 struct nxpwifi_txinfo *tx_info_aggr, *tx_info_src;
118 int pad = 0, aggr_num = 0, ret;
119 struct nxpwifi_tx_param tx_param;
120 struct txpd *ptx_pd = NULL;
121 int headroom = adapter->intf_hdr_len;
122
123 skb_src = skb_peek(&pra_list->skb_head);
124 if (!skb_src) {
125 spin_unlock_bh(&priv->wmm.ra_list_spinlock);
126 return 0;
127 }
128
129 tx_info_src = NXPWIFI_SKB_TXCB(skb_src);
130 skb_aggr = nxpwifi_alloc_dma_align_buf(adapter->tx_buf_size,
131 GFP_ATOMIC);
132 if (!skb_aggr) {
133 spin_unlock_bh(&priv->wmm.ra_list_spinlock);
134 return -ENOMEM;
135 }
136
137 /*
138 * skb_aggr->data already 64 byte align, just reserve bus interface
139 * header and txpd.
140 */
141 skb_reserve(skb_aggr, headroom + sizeof(struct txpd));
142 tx_info_aggr = NXPWIFI_SKB_TXCB(skb_aggr);
143
144 memset(tx_info_aggr, 0, sizeof(*tx_info_aggr));
145 tx_info_aggr->bss_type = tx_info_src->bss_type;
146 tx_info_aggr->bss_num = tx_info_src->bss_num;
147
148 tx_info_aggr->flags |= NXPWIFI_BUF_FLAG_AGGR_PKT;
149 skb_aggr->priority = skb_src->priority;
150 skb_aggr->tstamp = skb_src->tstamp;
151
152 do {
153 /* Check if AMSDU can accommodate this MSDU */
154 if ((skb_aggr->len + skb_src->len + LLC_SNAP_LEN) >
155 adapter->tx_buf_size)
156 break;
157
158 skb_src = skb_dequeue(&pra_list->skb_head);
159 pra_list->total_pkt_count--;
160 atomic_dec(&priv->wmm.tx_pkts_queued);
161 aggr_num++;
162 spin_unlock_bh(&priv->wmm.ra_list_spinlock);
163 nxpwifi_11n_form_amsdu_pkt(skb_aggr, skb_src, &pad);
164
165 nxpwifi_write_data_complete(adapter, skb_src, 0, 0);
166
167 spin_lock_bh(&priv->wmm.ra_list_spinlock);
168
169 if (!nxpwifi_is_ralist_valid(priv, pra_list, ptrindex)) {
170 spin_unlock_bh(&priv->wmm.ra_list_spinlock);
171 return -ENOENT;
172 }
173
174 if (skb_tailroom(skb_aggr) < pad) {
175 pad = 0;
176 break;
177 }
178 skb_put(skb_aggr, pad);
179
180 skb_src = skb_peek(&pra_list->skb_head);
181
182 } while (skb_src);
183
184 spin_unlock_bh(&priv->wmm.ra_list_spinlock);
185
186 /* Last AMSDU packet does not need padding */
187 skb_trim(skb_aggr, skb_aggr->len - pad);
188
189 /* Form AMSDU */
190 nxpwifi_11n_form_amsdu_txpd(priv, skb_aggr);
191 if (GET_BSS_ROLE(priv) == NXPWIFI_BSS_ROLE_STA)
192 ptx_pd = (struct txpd *)skb_aggr->data;
193
194 skb_push(skb_aggr, headroom);
195 tx_info_aggr->aggr_num = aggr_num * 2;
196 if (adapter->data_sent || adapter->tx_lock_flag) {
197 atomic_add(aggr_num * 2, &adapter->tx_queued);
198 skb_queue_tail(&adapter->tx_data_q, skb_aggr);
199 return 0;
200 }
201
202 if (skb_src)
203 tx_param.next_pkt_len = skb_src->len + sizeof(struct txpd);
204 else
205 tx_param.next_pkt_len = 0;
206
207 ret = adapter->if_ops.host_to_card(adapter, NXPWIFI_TYPE_DATA,
208 skb_aggr, &tx_param);
209
210 switch (ret) {
211 case -EBUSY:
212 spin_lock_bh(&priv->wmm.ra_list_spinlock);
213 if (!nxpwifi_is_ralist_valid(priv, pra_list, ptrindex)) {
214 spin_unlock_bh(&priv->wmm.ra_list_spinlock);
215 nxpwifi_write_data_complete(adapter, skb_aggr, 1, -1);
216 return -EINVAL;
217 }
218 if (GET_BSS_ROLE(priv) == NXPWIFI_BSS_ROLE_STA &&
219 adapter->pps_uapsd_mode && adapter->tx_lock_flag) {
220 priv->adapter->tx_lock_flag = false;
221 if (ptx_pd)
222 ptx_pd->flags = 0;
223 }
224
225 skb_queue_tail(&pra_list->skb_head, skb_aggr);
226
227 pra_list->total_pkt_count++;
228
229 atomic_inc(&priv->wmm.tx_pkts_queued);
230
231 tx_info_aggr->flags |= NXPWIFI_BUF_FLAG_REQUEUED_PKT;
232 spin_unlock_bh(&priv->wmm.ra_list_spinlock);
233 nxpwifi_dbg(adapter, ERROR, "data: -EBUSY is returned\n");
234 break;
235 case -EINPROGRESS:
236 break;
237 case 0:
238 nxpwifi_write_data_complete(adapter, skb_aggr, 1, ret);
239 break;
240 default:
241 nxpwifi_dbg(adapter, ERROR, "%s: host_to_card failed: %#x\n",
242 __func__, ret);
243 adapter->dbg.num_tx_host_to_card_failure++;
244 nxpwifi_write_data_complete(adapter, skb_aggr, 1, ret);
245 break;
246 }
247 if (ret != -EBUSY)
248 nxpwifi_rotate_priolists(priv, pra_list, ptrindex);
249
250 return 0;
251 }
252