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5e6e3a92 BZ |
1 | /* |
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 | */ | |
46 | static int | |
572e8f3e | 47 | mwifiex_11n_form_amsdu_pkt(struct sk_buff *skb_aggr, |
5e6e3a92 BZ |
48 | 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 | }; | |
270e58e8 | 63 | struct tx_packet_hdr *tx_header; |
5e6e3a92 BZ |
64 | |
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 | */ | |
101 | static void | |
102 | mwifiex_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 | ||
5e6e3a92 BZ |
138 | /* |
139 | * 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 | */ | |
154 | int | |
155 | mwifiex_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; | |
270e58e8 | 163 | int pad = 0, ret; |
5e6e3a92 BZ |
164 | struct mwifiex_tx_param tx_param; |
165 | struct txpd *ptx_pd = NULL; | |
166 | ||
a8fe3293 YAP |
167 | skb_src = skb_peek(&pra_list->skb_head); |
168 | if (!skb_src) { | |
5e6e3a92 BZ |
169 | spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, |
170 | ra_list_flags); | |
171 | return 0; | |
172 | } | |
a8fe3293 | 173 | |
5e6e3a92 BZ |
174 | tx_info_src = MWIFIEX_SKB_TXCB(skb_src); |
175 | skb_aggr = dev_alloc_skb(adapter->tx_buf_size); | |
176 | if (!skb_aggr) { | |
177 | dev_err(adapter->dev, "%s: alloc skb_aggr\n", __func__); | |
178 | spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, | |
179 | ra_list_flags); | |
180 | return -1; | |
181 | } | |
182 | skb_reserve(skb_aggr, headroom + sizeof(struct txpd)); | |
183 | tx_info_aggr = MWIFIEX_SKB_TXCB(skb_aggr); | |
184 | ||
9da9a3b2 YAP |
185 | tx_info_aggr->bss_type = tx_info_src->bss_type; |
186 | tx_info_aggr->bss_num = tx_info_src->bss_num; | |
5e6e3a92 BZ |
187 | skb_aggr->priority = skb_src->priority; |
188 | ||
fb3c19bc YAP |
189 | do { |
190 | /* Check if AMSDU can accommodate this MSDU */ | |
191 | if (skb_tailroom(skb_aggr) < (skb_src->len + LLC_SNAP_LEN)) | |
192 | break; | |
5e6e3a92 | 193 | |
a8fe3293 | 194 | skb_src = skb_dequeue(&pra_list->skb_head); |
5e6e3a92 | 195 | |
fb3c19bc | 196 | pra_list->total_pkts_size -= skb_src->len; |
5e6e3a92 | 197 | |
f699254c MY |
198 | atomic_dec(&priv->wmm.tx_pkts_queued); |
199 | ||
5e6e3a92 BZ |
200 | spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, |
201 | ra_list_flags); | |
572e8f3e | 202 | mwifiex_11n_form_amsdu_pkt(skb_aggr, skb_src, &pad); |
5e6e3a92 BZ |
203 | |
204 | mwifiex_write_data_complete(adapter, skb_src, 0); | |
205 | ||
206 | spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags); | |
207 | ||
208 | if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) { | |
209 | spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, | |
210 | ra_list_flags); | |
211 | return -1; | |
212 | } | |
213 | ||
fb3c19bc YAP |
214 | if (skb_tailroom(skb_aggr) < pad) { |
215 | pad = 0; | |
216 | break; | |
217 | } | |
218 | skb_put(skb_aggr, pad); | |
219 | ||
a8fe3293 | 220 | skb_src = skb_peek(&pra_list->skb_head); |
fb3c19bc YAP |
221 | |
222 | } while (skb_src); | |
5e6e3a92 BZ |
223 | |
224 | spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags); | |
225 | ||
226 | /* Last AMSDU packet does not need padding */ | |
227 | skb_trim(skb_aggr, skb_aggr->len - pad); | |
228 | ||
229 | /* Form AMSDU */ | |
230 | mwifiex_11n_form_amsdu_txpd(priv, skb_aggr); | |
231 | if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) | |
232 | ptx_pd = (struct txpd *)skb_aggr->data; | |
233 | ||
234 | skb_push(skb_aggr, headroom); | |
235 | ||
36cb7cce YAP |
236 | /* |
237 | * Padding per MSDU will affect the length of next | |
238 | * packet and hence the exact length of next packet | |
239 | * is uncertain here. | |
240 | * | |
241 | * Also, aggregation of transmission buffer, while | |
242 | * downloading the data to the card, wont gain much | |
243 | * on the AMSDU packets as the AMSDU packets utilizes | |
244 | * the transmission buffer space to the maximum | |
245 | * (adapter->tx_buf_size). | |
246 | */ | |
247 | tx_param.next_pkt_len = 0; | |
248 | ||
5e6e3a92 | 249 | ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA, |
d930faee | 250 | skb_aggr, &tx_param); |
5e6e3a92 BZ |
251 | switch (ret) { |
252 | case -EBUSY: | |
253 | spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags); | |
254 | if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) { | |
255 | spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, | |
256 | ra_list_flags); | |
257 | mwifiex_write_data_complete(adapter, skb_aggr, -1); | |
258 | return -1; | |
259 | } | |
260 | if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) && | |
261 | (adapter->pps_uapsd_mode) && | |
262 | (adapter->tx_lock_flag)) { | |
263 | priv->adapter->tx_lock_flag = false; | |
b53575ec CF |
264 | if (ptx_pd) |
265 | ptx_pd->flags = 0; | |
5e6e3a92 BZ |
266 | } |
267 | ||
268 | skb_queue_tail(&pra_list->skb_head, skb_aggr); | |
269 | ||
270 | pra_list->total_pkts_size += skb_aggr->len; | |
271 | ||
f699254c MY |
272 | atomic_inc(&priv->wmm.tx_pkts_queued); |
273 | ||
5e6e3a92 BZ |
274 | tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT; |
275 | spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, | |
276 | ra_list_flags); | |
277 | dev_dbg(adapter->dev, "data: -EBUSY is returned\n"); | |
278 | break; | |
279 | case -1: | |
280 | adapter->data_sent = false; | |
281 | dev_err(adapter->dev, "%s: host_to_card failed: %#x\n", | |
282 | __func__, ret); | |
283 | adapter->dbg.num_tx_host_to_card_failure++; | |
284 | mwifiex_write_data_complete(adapter, skb_aggr, ret); | |
285 | return 0; | |
286 | case -EINPROGRESS: | |
287 | adapter->data_sent = false; | |
288 | break; | |
289 | case 0: | |
290 | mwifiex_write_data_complete(adapter, skb_aggr, ret); | |
291 | break; | |
292 | default: | |
293 | break; | |
294 | } | |
295 | if (ret != -EBUSY) { | |
296 | spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags); | |
297 | if (mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) { | |
298 | priv->wmm.packets_out[ptrindex]++; | |
299 | priv->wmm.tid_tbl_ptr[ptrindex].ra_list_curr = pra_list; | |
300 | } | |
301 | /* Now bss_prio_cur pointer points to next node */ | |
302 | adapter->bss_prio_tbl[priv->bss_priority].bss_prio_cur = | |
303 | list_first_entry( | |
304 | &adapter->bss_prio_tbl[priv->bss_priority] | |
305 | .bss_prio_cur->list, | |
306 | struct mwifiex_bss_prio_node, list); | |
307 | spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, | |
308 | ra_list_flags); | |
309 | } | |
310 | ||
311 | return 0; | |
312 | } |