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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 | 64 | |
d92a6803 | 65 | tx_header = (void *)skb_put(skb_aggr, sizeof(*tx_header)); |
5e6e3a92 BZ |
66 | |
67 | /* Copy DA and SA */ | |
68 | dt_offset = 2 * ETH_ALEN; | |
69 | memcpy(&tx_header->eth803_hdr, skb_src->data, dt_offset); | |
70 | ||
71 | /* Copy SNAP header */ | |
72 | snap.snap_type = *(u16 *) ((u8 *)skb_src->data + dt_offset); | |
73 | dt_offset += sizeof(u16); | |
74 | ||
75 | memcpy(&tx_header->rfc1042_hdr, &snap, sizeof(struct rfc_1042_hdr)); | |
76 | ||
77 | skb_pull(skb_src, dt_offset); | |
78 | ||
79 | /* Update Length field */ | |
80 | tx_header->eth803_hdr.h_proto = htons(skb_src->len + LLC_SNAP_LEN); | |
81 | ||
82 | /* Add payload */ | |
d92a6803 YAP |
83 | memcpy(skb_put(skb_aggr, skb_src->len), skb_src->data, skb_src->len); |
84 | ||
bda1b1b7 YAP |
85 | /* Add padding for new MSDU to start from 4 byte boundary */ |
86 | *pad = (4 - ((unsigned long)skb_aggr->tail & 0x3)) % 4; | |
5e6e3a92 BZ |
87 | |
88 | return skb_aggr->len + *pad; | |
89 | } | |
90 | ||
91 | /* | |
92 | * Adds TxPD to AMSDU header. | |
93 | * | |
94 | * Each AMSDU packet will contain one TxPD at the beginning, | |
95 | * followed by multiple AMSDU subframes. | |
96 | */ | |
97 | static void | |
98 | mwifiex_11n_form_amsdu_txpd(struct mwifiex_private *priv, | |
99 | struct sk_buff *skb) | |
100 | { | |
101 | struct txpd *local_tx_pd; | |
102 | ||
103 | skb_push(skb, sizeof(*local_tx_pd)); | |
104 | ||
105 | local_tx_pd = (struct txpd *) skb->data; | |
106 | memset(local_tx_pd, 0, sizeof(struct txpd)); | |
107 | ||
108 | /* Original priority has been overwritten */ | |
109 | local_tx_pd->priority = (u8) skb->priority; | |
110 | local_tx_pd->pkt_delay_2ms = | |
111 | mwifiex_wmm_compute_drv_pkt_delay(priv, skb); | |
112 | local_tx_pd->bss_num = priv->bss_num; | |
113 | local_tx_pd->bss_type = priv->bss_type; | |
114 | /* Always zero as the data is followed by struct txpd */ | |
115 | local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd)); | |
116 | local_tx_pd->tx_pkt_type = cpu_to_le16(PKT_TYPE_AMSDU); | |
117 | local_tx_pd->tx_pkt_length = cpu_to_le16(skb->len - | |
84266841 | 118 | sizeof(*local_tx_pd)); |
5e6e3a92 BZ |
119 | |
120 | if (local_tx_pd->tx_control == 0) | |
121 | /* TxCtrl set by user or default */ | |
122 | local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl); | |
123 | ||
84266841 YAP |
124 | if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA && |
125 | priv->adapter->pps_uapsd_mode) { | |
5e6e3a92 BZ |
126 | if (true == mwifiex_check_last_packet_indication(priv)) { |
127 | priv->adapter->tx_lock_flag = true; | |
128 | local_tx_pd->flags = | |
129 | MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET; | |
130 | } | |
131 | } | |
132 | } | |
133 | ||
5e6e3a92 BZ |
134 | /* |
135 | * Create aggregated packet. | |
136 | * | |
137 | * This function creates an aggregated MSDU packet, by combining buffers | |
138 | * from the RA list. Each individual buffer is encapsulated as an AMSDU | |
139 | * subframe and all such subframes are concatenated together to form the | |
140 | * AMSDU packet. | |
141 | * | |
142 | * A TxPD is also added to the front of the resultant AMSDU packets for | |
143 | * transmission. The resultant packets format is - | |
144 | * | |
145 | * +---- ~ ----+------ ~ ------+------ ~ ------+-..-+------ ~ ------+ | |
146 | * | TxPD |AMSDU sub-frame|AMSDU sub-frame| .. |AMSDU sub-frame| | |
147 | * | | 1 | 2 | .. | n | | |
148 | * +---- ~ ----+------ ~ ------+------ ~ ------+ .. +------ ~ ------+ | |
149 | */ | |
150 | int | |
151 | mwifiex_11n_aggregate_pkt(struct mwifiex_private *priv, | |
152 | struct mwifiex_ra_list_tbl *pra_list, int headroom, | |
153 | int ptrindex, unsigned long ra_list_flags) | |
154 | __releases(&priv->wmm.ra_list_spinlock) | |
155 | { | |
156 | struct mwifiex_adapter *adapter = priv->adapter; | |
157 | struct sk_buff *skb_aggr, *skb_src; | |
158 | struct mwifiex_txinfo *tx_info_aggr, *tx_info_src; | |
270e58e8 | 159 | int pad = 0, ret; |
5e6e3a92 BZ |
160 | struct mwifiex_tx_param tx_param; |
161 | struct txpd *ptx_pd = NULL; | |
162 | ||
a8fe3293 YAP |
163 | skb_src = skb_peek(&pra_list->skb_head); |
164 | if (!skb_src) { | |
5e6e3a92 BZ |
165 | spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, |
166 | ra_list_flags); | |
167 | return 0; | |
168 | } | |
a8fe3293 | 169 | |
5e6e3a92 BZ |
170 | tx_info_src = MWIFIEX_SKB_TXCB(skb_src); |
171 | skb_aggr = dev_alloc_skb(adapter->tx_buf_size); | |
172 | if (!skb_aggr) { | |
173 | dev_err(adapter->dev, "%s: alloc skb_aggr\n", __func__); | |
174 | spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, | |
175 | ra_list_flags); | |
176 | return -1; | |
177 | } | |
178 | skb_reserve(skb_aggr, headroom + sizeof(struct txpd)); | |
179 | tx_info_aggr = MWIFIEX_SKB_TXCB(skb_aggr); | |
180 | ||
9da9a3b2 YAP |
181 | tx_info_aggr->bss_type = tx_info_src->bss_type; |
182 | tx_info_aggr->bss_num = tx_info_src->bss_num; | |
5e6e3a92 BZ |
183 | skb_aggr->priority = skb_src->priority; |
184 | ||
fb3c19bc YAP |
185 | do { |
186 | /* Check if AMSDU can accommodate this MSDU */ | |
187 | if (skb_tailroom(skb_aggr) < (skb_src->len + LLC_SNAP_LEN)) | |
188 | break; | |
5e6e3a92 | 189 | |
a8fe3293 | 190 | skb_src = skb_dequeue(&pra_list->skb_head); |
5e6e3a92 | 191 | |
fb3c19bc | 192 | pra_list->total_pkts_size -= skb_src->len; |
5e6e3a92 | 193 | |
f699254c MY |
194 | atomic_dec(&priv->wmm.tx_pkts_queued); |
195 | ||
5e6e3a92 BZ |
196 | spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, |
197 | ra_list_flags); | |
572e8f3e | 198 | mwifiex_11n_form_amsdu_pkt(skb_aggr, skb_src, &pad); |
5e6e3a92 BZ |
199 | |
200 | mwifiex_write_data_complete(adapter, skb_src, 0); | |
201 | ||
202 | spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags); | |
203 | ||
204 | if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) { | |
205 | spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, | |
206 | ra_list_flags); | |
207 | return -1; | |
208 | } | |
209 | ||
fb3c19bc YAP |
210 | if (skb_tailroom(skb_aggr) < pad) { |
211 | pad = 0; | |
212 | break; | |
213 | } | |
214 | skb_put(skb_aggr, pad); | |
215 | ||
a8fe3293 | 216 | skb_src = skb_peek(&pra_list->skb_head); |
fb3c19bc YAP |
217 | |
218 | } while (skb_src); | |
5e6e3a92 BZ |
219 | |
220 | spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags); | |
221 | ||
222 | /* Last AMSDU packet does not need padding */ | |
223 | skb_trim(skb_aggr, skb_aggr->len - pad); | |
224 | ||
225 | /* Form AMSDU */ | |
226 | mwifiex_11n_form_amsdu_txpd(priv, skb_aggr); | |
227 | if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) | |
228 | ptx_pd = (struct txpd *)skb_aggr->data; | |
229 | ||
230 | skb_push(skb_aggr, headroom); | |
231 | ||
4daffe35 AK |
232 | if (adapter->iface_type == MWIFIEX_USB) { |
233 | adapter->data_sent = true; | |
234 | ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_USB_EP_DATA, | |
235 | skb_aggr, NULL); | |
236 | } else { | |
237 | /* | |
238 | * Padding per MSDU will affect the length of next | |
239 | * packet and hence the exact length of next packet | |
240 | * is uncertain here. | |
241 | * | |
242 | * Also, aggregation of transmission buffer, while | |
243 | * downloading the data to the card, wont gain much | |
244 | * on the AMSDU packets as the AMSDU packets utilizes | |
245 | * the transmission buffer space to the maximum | |
246 | * (adapter->tx_buf_size). | |
247 | */ | |
248 | tx_param.next_pkt_len = 0; | |
249 | ||
250 | ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA, | |
251 | skb_aggr, &tx_param); | |
252 | } | |
5e6e3a92 BZ |
253 | switch (ret) { |
254 | case -EBUSY: | |
255 | spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags); | |
256 | if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) { | |
257 | spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, | |
258 | ra_list_flags); | |
259 | mwifiex_write_data_complete(adapter, skb_aggr, -1); | |
260 | return -1; | |
261 | } | |
84266841 YAP |
262 | if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA && |
263 | adapter->pps_uapsd_mode && adapter->tx_lock_flag) { | |
5e6e3a92 | 264 | priv->adapter->tx_lock_flag = false; |
b53575ec CF |
265 | if (ptx_pd) |
266 | ptx_pd->flags = 0; | |
5e6e3a92 BZ |
267 | } |
268 | ||
269 | skb_queue_tail(&pra_list->skb_head, skb_aggr); | |
270 | ||
271 | pra_list->total_pkts_size += skb_aggr->len; | |
272 | ||
f699254c MY |
273 | atomic_inc(&priv->wmm.tx_pkts_queued); |
274 | ||
5e6e3a92 BZ |
275 | tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT; |
276 | spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, | |
277 | ra_list_flags); | |
278 | dev_dbg(adapter->dev, "data: -EBUSY is returned\n"); | |
279 | break; | |
280 | case -1: | |
281 | adapter->data_sent = false; | |
282 | dev_err(adapter->dev, "%s: host_to_card failed: %#x\n", | |
84266841 | 283 | __func__, ret); |
5e6e3a92 BZ |
284 | adapter->dbg.num_tx_host_to_card_failure++; |
285 | mwifiex_write_data_complete(adapter, skb_aggr, ret); | |
286 | return 0; | |
287 | case -EINPROGRESS: | |
288 | adapter->data_sent = false; | |
289 | break; | |
290 | case 0: | |
291 | mwifiex_write_data_complete(adapter, skb_aggr, ret); | |
292 | break; | |
293 | default: | |
294 | break; | |
295 | } | |
296 | if (ret != -EBUSY) { | |
297 | spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags); | |
298 | if (mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) { | |
299 | priv->wmm.packets_out[ptrindex]++; | |
300 | priv->wmm.tid_tbl_ptr[ptrindex].ra_list_curr = pra_list; | |
301 | } | |
302 | /* Now bss_prio_cur pointer points to next node */ | |
303 | adapter->bss_prio_tbl[priv->bss_priority].bss_prio_cur = | |
304 | list_first_entry( | |
305 | &adapter->bss_prio_tbl[priv->bss_priority] | |
306 | .bss_prio_cur->list, | |
307 | struct mwifiex_bss_prio_node, list); | |
308 | spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, | |
309 | ra_list_flags); | |
310 | } | |
311 | ||
312 | return 0; | |
313 | } |