1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * NXP Wireless LAN device driver: 802.11n Aggregation
4 *
5 * Copyright 2011-2020 NXP
6 */
7
8 #include "decl.h"
9 #include "ioctl.h"
10 #include "util.h"
11 #include "fw.h"
12 #include "main.h"
13 #include "wmm.h"
14 #include "11n.h"
15 #include "11n_aggr.h"
16
17 /*
18 * Creates an AMSDU subframe for aggregation into one AMSDU packet.
19 *
20 * The resultant AMSDU subframe format is -
21 *
22 * +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+
23 * | DA | SA | Length | SNAP header | MSDU |
24 * | data[0..5] | data[6..11] | | | data[14..] |
25 * +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+
26 * <--6-bytes--> <--6-bytes--> <--2-bytes--><--8-bytes--> <--n-bytes-->
27 *
28 * This function also computes the amount of padding required to make the
29 * buffer length multiple of 4 bytes.
30 *
31 * Data => |DA|SA|SNAP-TYPE|........ .|
32 * MSDU => |DA|SA|Length|SNAP|...... ..|
33 */
34 static int
mwifiex_11n_form_amsdu_pkt(struct sk_buff * skb_aggr,struct sk_buff * skb_src,int * pad)35 mwifiex_11n_form_amsdu_pkt(struct sk_buff *skb_aggr,
36 struct sk_buff *skb_src, int *pad)
37
38 {
39 int dt_offset;
40 struct rfc_1042_hdr snap = {
41 0xaa, /* LLC DSAP */
42 0xaa, /* LLC SSAP */
43 0x03, /* LLC CTRL */
44 {0x00, 0x00, 0x00}, /* SNAP OUI */
45 0x0000 /* SNAP type */
46 /*
47 * This field will be overwritten
48 * later with ethertype
49 */
50 };
51 struct tx_packet_hdr *tx_header;
52
53 tx_header = skb_put(skb_aggr, sizeof(*tx_header));
54
55 /* Copy DA and SA */
56 dt_offset = 2 * ETH_ALEN;
57 memcpy(&tx_header->eth803_hdr, skb_src->data, dt_offset);
58
59 /* Copy SNAP header */
60 snap.snap_type = ((struct ethhdr *)skb_src->data)->h_proto;
61
62 dt_offset += sizeof(__be16);
63
64 memcpy(&tx_header->rfc1042_hdr, &snap, sizeof(struct rfc_1042_hdr));
65
66 skb_pull(skb_src, dt_offset);
67
68 /* Update Length field */
69 tx_header->eth803_hdr.h_proto = htons(skb_src->len + LLC_SNAP_LEN);
70
71 /* Add payload */
72 skb_put_data(skb_aggr, skb_src->data, skb_src->len);
73
74 /* Add padding for new MSDU to start from 4 byte boundary */
75 *pad = (4 - ((unsigned long)skb_aggr->tail & 0x3)) % 4;
76
77 return skb_aggr->len + *pad;
78 }
79
80 /*
81 * Adds TxPD to AMSDU header.
82 *
83 * Each AMSDU packet will contain one TxPD at the beginning,
84 * followed by multiple AMSDU subframes.
85 */
86 static void
mwifiex_11n_form_amsdu_txpd(struct mwifiex_private * priv,struct sk_buff * skb)87 mwifiex_11n_form_amsdu_txpd(struct mwifiex_private *priv,
88 struct sk_buff *skb)
89 {
90 struct txpd *local_tx_pd;
91 struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
92
93 skb_push(skb, sizeof(*local_tx_pd));
94
95 local_tx_pd = (struct txpd *) skb->data;
96 memset(local_tx_pd, 0, sizeof(struct txpd));
97
98 /* Original priority has been overwritten */
99 local_tx_pd->priority = (u8) skb->priority;
100 local_tx_pd->pkt_delay_2ms =
101 mwifiex_wmm_compute_drv_pkt_delay(priv, skb);
102 local_tx_pd->bss_num = priv->bss_num;
103 local_tx_pd->bss_type = priv->bss_type;
104 /* Always zero as the data is followed by struct txpd */
105 local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd));
106 local_tx_pd->tx_pkt_type = cpu_to_le16(PKT_TYPE_AMSDU);
107 local_tx_pd->tx_pkt_length = cpu_to_le16(skb->len -
108 sizeof(*local_tx_pd));
109
110 if (tx_info->flags & MWIFIEX_BUF_FLAG_TDLS_PKT)
111 local_tx_pd->flags |= MWIFIEX_TXPD_FLAGS_TDLS_PACKET;
112
113 if (local_tx_pd->tx_control == 0)
114 /* TxCtrl set by user or default */
115 local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
116
117 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
118 priv->adapter->pps_uapsd_mode) {
119 if (true == mwifiex_check_last_packet_indication(priv)) {
120 priv->adapter->tx_lock_flag = true;
121 local_tx_pd->flags =
122 MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET;
123 }
124 }
125 }
126
127 /*
128 * Create aggregated packet.
129 *
130 * This function creates an aggregated MSDU packet, by combining buffers
131 * from the RA list. Each individual buffer is encapsulated as an AMSDU
132 * subframe and all such subframes are concatenated together to form the
133 * AMSDU packet.
134 *
135 * A TxPD is also added to the front of the resultant AMSDU packets for
136 * transmission. The resultant packets format is -
137 *
138 * +---- ~ ----+------ ~ ------+------ ~ ------+-..-+------ ~ ------+
139 * | TxPD |AMSDU sub-frame|AMSDU sub-frame| .. |AMSDU sub-frame|
140 * | | 1 | 2 | .. | n |
141 * +---- ~ ----+------ ~ ------+------ ~ ------+ .. +------ ~ ------+
142 */
143 int
mwifiex_11n_aggregate_pkt(struct mwifiex_private * priv,struct mwifiex_ra_list_tbl * pra_list,int ptrindex)144 mwifiex_11n_aggregate_pkt(struct mwifiex_private *priv,
145 struct mwifiex_ra_list_tbl *pra_list,
146 int ptrindex)
147 __releases(&priv->wmm.ra_list_spinlock)
148 {
149 struct mwifiex_adapter *adapter = priv->adapter;
150 struct sk_buff *skb_aggr, *skb_src;
151 struct mwifiex_txinfo *tx_info_aggr, *tx_info_src;
152 int pad = 0, aggr_num = 0, ret;
153 struct mwifiex_tx_param tx_param;
154 struct txpd *ptx_pd = NULL;
155 int headroom = adapter->intf_hdr_len;
156
157 skb_src = skb_peek(&pra_list->skb_head);
158 if (!skb_src) {
159 spin_unlock_bh(&priv->wmm.ra_list_spinlock);
160 return 0;
161 }
162
163 tx_info_src = MWIFIEX_SKB_TXCB(skb_src);
164 skb_aggr = mwifiex_alloc_dma_align_buf(adapter->tx_buf_size,
165 GFP_ATOMIC);
166 if (!skb_aggr) {
167 spin_unlock_bh(&priv->wmm.ra_list_spinlock);
168 return -1;
169 }
170
171 /* skb_aggr->data already 64 byte align, just reserve bus interface
172 * header and txpd.
173 */
174 skb_reserve(skb_aggr, headroom + sizeof(struct txpd));
175 tx_info_aggr = MWIFIEX_SKB_TXCB(skb_aggr);
176
177 memset(tx_info_aggr, 0, sizeof(*tx_info_aggr));
178 tx_info_aggr->bss_type = tx_info_src->bss_type;
179 tx_info_aggr->bss_num = tx_info_src->bss_num;
180
181 if (tx_info_src->flags & MWIFIEX_BUF_FLAG_TDLS_PKT)
182 tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_TDLS_PKT;
183 tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_AGGR_PKT;
184 skb_aggr->priority = skb_src->priority;
185 skb_aggr->tstamp = skb_src->tstamp;
186
187 do {
188 /* Check if AMSDU can accommodate this MSDU */
189 if ((skb_aggr->len + skb_src->len + LLC_SNAP_LEN) >
190 adapter->tx_buf_size)
191 break;
192
193 skb_src = skb_dequeue(&pra_list->skb_head);
194 pra_list->total_pkt_count--;
195 atomic_dec(&priv->wmm.tx_pkts_queued);
196 aggr_num++;
197 spin_unlock_bh(&priv->wmm.ra_list_spinlock);
198 mwifiex_11n_form_amsdu_pkt(skb_aggr, skb_src, &pad);
199
200 mwifiex_write_data_complete(adapter, skb_src, 0, 0);
201
202 spin_lock_bh(&priv->wmm.ra_list_spinlock);
203
204 if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) {
205 spin_unlock_bh(&priv->wmm.ra_list_spinlock);
206 return -1;
207 }
208
209 if (skb_tailroom(skb_aggr) < pad) {
210 pad = 0;
211 break;
212 }
213 skb_put(skb_aggr, pad);
214
215 skb_src = skb_peek(&pra_list->skb_head);
216
217 } while (skb_src);
218
219 spin_unlock_bh(&priv->wmm.ra_list_spinlock);
220
221 /* Last AMSDU packet does not need padding */
222 skb_trim(skb_aggr, skb_aggr->len - pad);
223
224 /* Form AMSDU */
225 mwifiex_11n_form_amsdu_txpd(priv, skb_aggr);
226 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA)
227 ptx_pd = (struct txpd *)skb_aggr->data;
228
229 skb_push(skb_aggr, headroom);
230 tx_info_aggr->aggr_num = aggr_num * 2;
231 if (adapter->data_sent || adapter->tx_lock_flag) {
232 atomic_add(aggr_num * 2, &adapter->tx_queued);
233 skb_queue_tail(&adapter->tx_data_q, skb_aggr);
234 return 0;
235 }
236
237 if (skb_src)
238 tx_param.next_pkt_len = skb_src->len + sizeof(struct txpd);
239 else
240 tx_param.next_pkt_len = 0;
241
242 if (adapter->iface_type == MWIFIEX_USB) {
243 ret = adapter->if_ops.host_to_card(adapter, priv->usb_port,
244 skb_aggr, &tx_param);
245 } else {
246
247 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
248 skb_aggr, &tx_param);
249 }
250 switch (ret) {
251 case -EBUSY:
252 spin_lock_bh(&priv->wmm.ra_list_spinlock);
253 if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) {
254 spin_unlock_bh(&priv->wmm.ra_list_spinlock);
255 mwifiex_write_data_complete(adapter, skb_aggr, 1, -1);
256 return -1;
257 }
258 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
259 adapter->pps_uapsd_mode && adapter->tx_lock_flag) {
260 priv->adapter->tx_lock_flag = false;
261 if (ptx_pd)
262 ptx_pd->flags = 0;
263 }
264
265 skb_queue_tail(&pra_list->skb_head, skb_aggr);
266
267 pra_list->total_pkt_count++;
268
269 atomic_inc(&priv->wmm.tx_pkts_queued);
270
271 tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
272 spin_unlock_bh(&priv->wmm.ra_list_spinlock);
273 mwifiex_dbg(adapter, ERROR, "data: -EBUSY is returned\n");
274 break;
275 case -1:
276 mwifiex_dbg(adapter, ERROR, "%s: host_to_card failed: %#x\n",
277 __func__, ret);
278 adapter->dbg.num_tx_host_to_card_failure++;
279 mwifiex_write_data_complete(adapter, skb_aggr, 1, ret);
280 return 0;
281 case -EINPROGRESS:
282 break;
283 case 0:
284 mwifiex_write_data_complete(adapter, skb_aggr, 1, ret);
285 break;
286 default:
287 break;
288 }
289 if (ret != -EBUSY) {
290 mwifiex_rotate_priolists(priv, pra_list, ptrindex);
291 }
292
293 return 0;
294 }
295