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Bing Zhao5e6e3a92011-03-21 18:00:50 -07001/*
2 * Marvell Wireless LAN device driver: 802.11n Aggregation
3 *
4 * Copyright (C) 2011, Marvell International Ltd.
5 *
6 * This software file (the "File") is distributed by Marvell International
7 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
8 * (the "License"). You may use, redistribute and/or modify this File in
9 * accordance with the terms and conditions of the License, a copy of which
10 * is available by writing to the Free Software Foundation, Inc.,
11 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
12 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
13 *
14 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
16 * ARE EXPRESSLY DISCLAIMED. The License provides additional details about
17 * this warranty disclaimer.
18 */
19
20#include "decl.h"
21#include "ioctl.h"
22#include "util.h"
23#include "fw.h"
24#include "main.h"
25#include "wmm.h"
26#include "11n.h"
27#include "11n_aggr.h"
28
29/*
30 * Creates an AMSDU subframe for aggregation into one AMSDU packet.
31 *
32 * The resultant AMSDU subframe format is -
33 *
34 * +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+
35 * | DA | SA | Length | SNAP header | MSDU |
36 * | data[0..5] | data[6..11] | | | data[14..] |
37 * +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+
38 * <--6-bytes--> <--6-bytes--> <--2-bytes--><--8-bytes--> <--n-bytes-->
39 *
40 * This function also computes the amount of padding required to make the
41 * buffer length multiple of 4 bytes.
42 *
43 * Data => |DA|SA|SNAP-TYPE|........ .|
44 * MSDU => |DA|SA|Length|SNAP|...... ..|
45 */
46static int
Amitkumar Karwar572e8f32011-04-13 17:27:08 -070047mwifiex_11n_form_amsdu_pkt(struct sk_buff *skb_aggr,
Bing Zhao5e6e3a92011-03-21 18:00:50 -070048 struct sk_buff *skb_src, int *pad)
49
50{
51 int dt_offset;
52 struct rfc_1042_hdr snap = {
53 0xaa, /* LLC DSAP */
54 0xaa, /* LLC SSAP */
55 0x03, /* LLC CTRL */
56 {0x00, 0x00, 0x00}, /* SNAP OUI */
57 0x0000 /* SNAP type */
58 /*
59 * This field will be overwritten
60 * later with ethertype
61 */
62 };
Yogesh Ashok Powar270e58e2011-05-03 20:11:46 -070063 struct tx_packet_hdr *tx_header;
Bing Zhao5e6e3a92011-03-21 18:00:50 -070064
65 skb_put(skb_aggr, sizeof(*tx_header));
66
67 tx_header = (struct tx_packet_hdr *) skb_aggr->data;
68
69 /* Copy DA and SA */
70 dt_offset = 2 * ETH_ALEN;
71 memcpy(&tx_header->eth803_hdr, skb_src->data, dt_offset);
72
73 /* Copy SNAP header */
74 snap.snap_type = *(u16 *) ((u8 *)skb_src->data + dt_offset);
75 dt_offset += sizeof(u16);
76
77 memcpy(&tx_header->rfc1042_hdr, &snap, sizeof(struct rfc_1042_hdr));
78
79 skb_pull(skb_src, dt_offset);
80
81 /* Update Length field */
82 tx_header->eth803_hdr.h_proto = htons(skb_src->len + LLC_SNAP_LEN);
83
84 /* Add payload */
85 skb_put(skb_aggr, skb_src->len);
86 memcpy(skb_aggr->data + sizeof(*tx_header), skb_src->data,
87 skb_src->len);
88 *pad = (((skb_src->len + LLC_SNAP_LEN) & 3)) ? (4 - (((skb_src->len +
89 LLC_SNAP_LEN)) & 3)) : 0;
90 skb_put(skb_aggr, *pad);
91
92 return skb_aggr->len + *pad;
93}
94
95/*
96 * Adds TxPD to AMSDU header.
97 *
98 * Each AMSDU packet will contain one TxPD at the beginning,
99 * followed by multiple AMSDU subframes.
100 */
101static void
102mwifiex_11n_form_amsdu_txpd(struct mwifiex_private *priv,
103 struct sk_buff *skb)
104{
105 struct txpd *local_tx_pd;
106
107 skb_push(skb, sizeof(*local_tx_pd));
108
109 local_tx_pd = (struct txpd *) skb->data;
110 memset(local_tx_pd, 0, sizeof(struct txpd));
111
112 /* Original priority has been overwritten */
113 local_tx_pd->priority = (u8) skb->priority;
114 local_tx_pd->pkt_delay_2ms =
115 mwifiex_wmm_compute_drv_pkt_delay(priv, skb);
116 local_tx_pd->bss_num = priv->bss_num;
117 local_tx_pd->bss_type = priv->bss_type;
118 /* Always zero as the data is followed by struct txpd */
119 local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd));
120 local_tx_pd->tx_pkt_type = cpu_to_le16(PKT_TYPE_AMSDU);
121 local_tx_pd->tx_pkt_length = cpu_to_le16(skb->len -
122 sizeof(*local_tx_pd));
123
124 if (local_tx_pd->tx_control == 0)
125 /* TxCtrl set by user or default */
126 local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
127
128 if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) &&
129 (priv->adapter->pps_uapsd_mode)) {
130 if (true == mwifiex_check_last_packet_indication(priv)) {
131 priv->adapter->tx_lock_flag = true;
132 local_tx_pd->flags =
133 MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET;
134 }
135 }
136}
137
138/*
Bing Zhao5e6e3a92011-03-21 18:00:50 -0700139 * Create aggregated packet.
140 *
141 * This function creates an aggregated MSDU packet, by combining buffers
142 * from the RA list. Each individual buffer is encapsulated as an AMSDU
143 * subframe and all such subframes are concatenated together to form the
144 * AMSDU packet.
145 *
146 * A TxPD is also added to the front of the resultant AMSDU packets for
147 * transmission. The resultant packets format is -
148 *
149 * +---- ~ ----+------ ~ ------+------ ~ ------+-..-+------ ~ ------+
150 * | TxPD |AMSDU sub-frame|AMSDU sub-frame| .. |AMSDU sub-frame|
151 * | | 1 | 2 | .. | n |
152 * +---- ~ ----+------ ~ ------+------ ~ ------+ .. +------ ~ ------+
153 */
154int
155mwifiex_11n_aggregate_pkt(struct mwifiex_private *priv,
156 struct mwifiex_ra_list_tbl *pra_list, int headroom,
157 int ptrindex, unsigned long ra_list_flags)
158 __releases(&priv->wmm.ra_list_spinlock)
159{
160 struct mwifiex_adapter *adapter = priv->adapter;
161 struct sk_buff *skb_aggr, *skb_src;
162 struct mwifiex_txinfo *tx_info_aggr, *tx_info_src;
Yogesh Ashok Powar270e58e2011-05-03 20:11:46 -0700163 int pad = 0, ret;
Bing Zhao5e6e3a92011-03-21 18:00:50 -0700164 struct mwifiex_tx_param tx_param;
165 struct txpd *ptx_pd = NULL;
166
167 if (skb_queue_empty(&pra_list->skb_head)) {
168 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
169 ra_list_flags);
170 return 0;
171 }
172 skb_src = skb_peek(&pra_list->skb_head);
173 tx_info_src = MWIFIEX_SKB_TXCB(skb_src);
174 skb_aggr = dev_alloc_skb(adapter->tx_buf_size);
175 if (!skb_aggr) {
176 dev_err(adapter->dev, "%s: alloc skb_aggr\n", __func__);
177 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
178 ra_list_flags);
179 return -1;
180 }
181 skb_reserve(skb_aggr, headroom + sizeof(struct txpd));
182 tx_info_aggr = MWIFIEX_SKB_TXCB(skb_aggr);
183
184 tx_info_aggr->bss_index = tx_info_src->bss_index;
185 skb_aggr->priority = skb_src->priority;
186
187 while (skb_src && ((skb_headroom(skb_aggr) + skb_src->len
188 + LLC_SNAP_LEN)
189 <= adapter->tx_buf_size)) {
190
191 if (!skb_queue_empty(&pra_list->skb_head))
192 skb_src = skb_dequeue(&pra_list->skb_head);
193 else
194 skb_src = NULL;
195
Christoph Fritzb53575e2011-05-08 22:50:09 +0200196 if (skb_src)
197 pra_list->total_pkts_size -= skb_src->len;
Bing Zhao5e6e3a92011-03-21 18:00:50 -0700198
Marc Yangf6992542011-05-16 19:17:49 -0700199 atomic_dec(&priv->wmm.tx_pkts_queued);
200
Bing Zhao5e6e3a92011-03-21 18:00:50 -0700201 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
202 ra_list_flags);
Amitkumar Karwar572e8f32011-04-13 17:27:08 -0700203 mwifiex_11n_form_amsdu_pkt(skb_aggr, skb_src, &pad);
Bing Zhao5e6e3a92011-03-21 18:00:50 -0700204
205 mwifiex_write_data_complete(adapter, skb_src, 0);
206
207 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
208
209 if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) {
210 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
211 ra_list_flags);
212 return -1;
213 }
214
215 if (!skb_queue_empty(&pra_list->skb_head))
216 skb_src = skb_peek(&pra_list->skb_head);
217 else
218 skb_src = NULL;
219 }
220
221 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
222
223 /* Last AMSDU packet does not need padding */
224 skb_trim(skb_aggr, skb_aggr->len - pad);
225
226 /* Form AMSDU */
227 mwifiex_11n_form_amsdu_txpd(priv, skb_aggr);
228 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA)
229 ptx_pd = (struct txpd *)skb_aggr->data;
230
231 skb_push(skb_aggr, headroom);
232
233 tx_param.next_pkt_len = ((pra_list->total_pkts_size) ?
234 (((pra_list->total_pkts_size) >
235 adapter->tx_buf_size) ? adapter->
236 tx_buf_size : pra_list->total_pkts_size +
237 LLC_SNAP_LEN + sizeof(struct txpd)) : 0);
238 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
239 skb_aggr->data,
240 skb_aggr->len, &tx_param);
241 switch (ret) {
242 case -EBUSY:
243 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
244 if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) {
245 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
246 ra_list_flags);
247 mwifiex_write_data_complete(adapter, skb_aggr, -1);
248 return -1;
249 }
250 if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) &&
251 (adapter->pps_uapsd_mode) &&
252 (adapter->tx_lock_flag)) {
253 priv->adapter->tx_lock_flag = false;
Christoph Fritzb53575e2011-05-08 22:50:09 +0200254 if (ptx_pd)
255 ptx_pd->flags = 0;
Bing Zhao5e6e3a92011-03-21 18:00:50 -0700256 }
257
258 skb_queue_tail(&pra_list->skb_head, skb_aggr);
259
260 pra_list->total_pkts_size += skb_aggr->len;
261
Marc Yangf6992542011-05-16 19:17:49 -0700262 atomic_inc(&priv->wmm.tx_pkts_queued);
263
Bing Zhao5e6e3a92011-03-21 18:00:50 -0700264 tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
265 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
266 ra_list_flags);
267 dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
268 break;
269 case -1:
270 adapter->data_sent = false;
271 dev_err(adapter->dev, "%s: host_to_card failed: %#x\n",
272 __func__, ret);
273 adapter->dbg.num_tx_host_to_card_failure++;
274 mwifiex_write_data_complete(adapter, skb_aggr, ret);
275 return 0;
276 case -EINPROGRESS:
277 adapter->data_sent = false;
278 break;
279 case 0:
280 mwifiex_write_data_complete(adapter, skb_aggr, ret);
281 break;
282 default:
283 break;
284 }
285 if (ret != -EBUSY) {
286 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
287 if (mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) {
288 priv->wmm.packets_out[ptrindex]++;
289 priv->wmm.tid_tbl_ptr[ptrindex].ra_list_curr = pra_list;
290 }
291 /* Now bss_prio_cur pointer points to next node */
292 adapter->bss_prio_tbl[priv->bss_priority].bss_prio_cur =
293 list_first_entry(
294 &adapter->bss_prio_tbl[priv->bss_priority]
295 .bss_prio_cur->list,
296 struct mwifiex_bss_prio_node, list);
297 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
298 ra_list_flags);
299 }
300
301 return 0;
302}