Commit | Line | Data |
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838e4f44 AP |
1 | /* |
2 | * Marvell Wireless LAN device driver: AP TX and RX data handling | |
3 | * | |
4 | * Copyright (C) 2012, 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 "main.h" | |
23 | #include "wmm.h" | |
d1cf3b95 AP |
24 | #include "11n_aggr.h" |
25 | #include "11n_rxreorder.h" | |
838e4f44 | 26 | |
61c87304 AP |
27 | /* This function checks if particular RA list has packets more than low bridge |
28 | * packet threshold and then deletes packet from this RA list. | |
29 | * Function deletes packets from such RA list and returns true. If no such list | |
30 | * is found, false is returned. | |
31 | */ | |
32 | static bool | |
33 | mwifiex_uap_del_tx_pkts_in_ralist(struct mwifiex_private *priv, | |
34 | struct list_head *ra_list_head) | |
35 | { | |
36 | struct mwifiex_ra_list_tbl *ra_list; | |
37 | struct sk_buff *skb, *tmp; | |
38 | bool pkt_deleted = false; | |
39 | struct mwifiex_txinfo *tx_info; | |
40 | struct mwifiex_adapter *adapter = priv->adapter; | |
41 | ||
42 | list_for_each_entry(ra_list, ra_list_head, list) { | |
43 | if (skb_queue_empty(&ra_list->skb_head)) | |
44 | continue; | |
45 | ||
46 | skb_queue_walk_safe(&ra_list->skb_head, skb, tmp) { | |
47 | tx_info = MWIFIEX_SKB_TXCB(skb); | |
48 | if (tx_info->flags & MWIFIEX_BUF_FLAG_BRIDGED_PKT) { | |
49 | __skb_unlink(skb, &ra_list->skb_head); | |
50 | mwifiex_write_data_complete(adapter, skb, 0, | |
51 | -1); | |
52 | atomic_dec(&priv->wmm.tx_pkts_queued); | |
53 | pkt_deleted = true; | |
54 | } | |
55 | if ((atomic_read(&adapter->pending_bridged_pkts) <= | |
56 | MWIFIEX_BRIDGED_PKTS_THR_LOW)) | |
57 | break; | |
58 | } | |
59 | } | |
60 | ||
61 | return pkt_deleted; | |
62 | } | |
63 | ||
64 | /* This function deletes packets from particular RA List. RA list index | |
65 | * from which packets are deleted is preserved so that packets from next RA | |
66 | * list are deleted upon subsequent call thus maintaining fairness. | |
67 | */ | |
68 | static void mwifiex_uap_cleanup_tx_queues(struct mwifiex_private *priv) | |
69 | { | |
70 | unsigned long flags; | |
71 | struct list_head *ra_list; | |
72 | int i; | |
73 | ||
74 | spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags); | |
75 | ||
76 | for (i = 0; i < MAX_NUM_TID; i++, priv->del_list_idx++) { | |
77 | if (priv->del_list_idx == MAX_NUM_TID) | |
78 | priv->del_list_idx = 0; | |
79 | ra_list = &priv->wmm.tid_tbl_ptr[priv->del_list_idx].ra_list; | |
80 | if (mwifiex_uap_del_tx_pkts_in_ralist(priv, ra_list)) { | |
81 | priv->del_list_idx++; | |
82 | break; | |
83 | } | |
84 | } | |
85 | ||
86 | spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags); | |
87 | } | |
88 | ||
89 | ||
838e4f44 AP |
90 | static void mwifiex_uap_queue_bridged_pkt(struct mwifiex_private *priv, |
91 | struct sk_buff *skb) | |
92 | { | |
93 | struct mwifiex_adapter *adapter = priv->adapter; | |
94 | struct uap_rxpd *uap_rx_pd; | |
95 | struct rx_packet_hdr *rx_pkt_hdr; | |
96 | struct sk_buff *new_skb; | |
97 | struct mwifiex_txinfo *tx_info; | |
98 | int hdr_chop; | |
99 | struct timeval tv; | |
100 | u8 rfc1042_eth_hdr[ETH_ALEN] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; | |
101 | ||
102 | uap_rx_pd = (struct uap_rxpd *)(skb->data); | |
103 | rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset); | |
104 | ||
105 | if ((atomic_read(&adapter->pending_bridged_pkts) >= | |
61c87304 | 106 | MWIFIEX_BRIDGED_PKTS_THR_HIGH)) { |
838e4f44 AP |
107 | dev_err(priv->adapter->dev, |
108 | "Tx: Bridge packet limit reached. Drop packet!\n"); | |
109 | kfree_skb(skb); | |
61c87304 | 110 | mwifiex_uap_cleanup_tx_queues(priv); |
838e4f44 AP |
111 | return; |
112 | } | |
113 | ||
114 | if (!memcmp(&rx_pkt_hdr->rfc1042_hdr, | |
115 | rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr))) | |
116 | /* Chop off the rxpd + the excess memory from | |
117 | * 802.2/llc/snap header that was removed. | |
118 | */ | |
119 | hdr_chop = (u8 *)eth_hdr - (u8 *)uap_rx_pd; | |
120 | else | |
121 | /* Chop off the rxpd */ | |
122 | hdr_chop = (u8 *)&rx_pkt_hdr->eth803_hdr - (u8 *)uap_rx_pd; | |
123 | ||
124 | /* Chop off the leading header bytes so the it points | |
125 | * to the start of either the reconstructed EthII frame | |
126 | * or the 802.2/llc/snap frame. | |
127 | */ | |
128 | skb_pull(skb, hdr_chop); | |
129 | ||
130 | if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) { | |
131 | dev_dbg(priv->adapter->dev, | |
132 | "data: Tx: insufficient skb headroom %d\n", | |
133 | skb_headroom(skb)); | |
134 | /* Insufficient skb headroom - allocate a new skb */ | |
135 | new_skb = | |
136 | skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN); | |
137 | if (unlikely(!new_skb)) { | |
138 | dev_err(priv->adapter->dev, | |
139 | "Tx: cannot allocate new_skb\n"); | |
140 | kfree_skb(skb); | |
141 | priv->stats.tx_dropped++; | |
142 | return; | |
143 | } | |
144 | ||
145 | kfree_skb(skb); | |
146 | skb = new_skb; | |
147 | dev_dbg(priv->adapter->dev, "info: new skb headroom %d\n", | |
148 | skb_headroom(skb)); | |
149 | } | |
150 | ||
151 | tx_info = MWIFIEX_SKB_TXCB(skb); | |
152 | tx_info->bss_num = priv->bss_num; | |
153 | tx_info->bss_type = priv->bss_type; | |
154 | tx_info->flags |= MWIFIEX_BUF_FLAG_BRIDGED_PKT; | |
155 | ||
156 | do_gettimeofday(&tv); | |
157 | skb->tstamp = timeval_to_ktime(tv); | |
158 | mwifiex_wmm_add_buf_txqueue(priv, skb); | |
159 | atomic_inc(&adapter->tx_pending); | |
160 | atomic_inc(&adapter->pending_bridged_pkts); | |
161 | ||
838e4f44 AP |
162 | return; |
163 | } | |
164 | ||
165 | /* | |
166 | * This function contains logic for AP packet forwarding. | |
167 | * | |
168 | * If a packet is multicast/broadcast, it is sent to kernel/upper layer | |
169 | * as well as queued back to AP TX queue so that it can be sent to other | |
170 | * associated stations. | |
171 | * If a packet is unicast and RA is present in associated station list, | |
172 | * it is again requeued into AP TX queue. | |
173 | * If a packet is unicast and RA is not in associated station list, | |
174 | * packet is forwarded to kernel to handle routing logic. | |
175 | */ | |
176 | int mwifiex_handle_uap_rx_forward(struct mwifiex_private *priv, | |
177 | struct sk_buff *skb) | |
178 | { | |
179 | struct mwifiex_adapter *adapter = priv->adapter; | |
180 | struct uap_rxpd *uap_rx_pd; | |
181 | struct rx_packet_hdr *rx_pkt_hdr; | |
182 | u8 ra[ETH_ALEN]; | |
183 | struct sk_buff *skb_uap; | |
184 | ||
185 | uap_rx_pd = (struct uap_rxpd *)(skb->data); | |
186 | rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset); | |
187 | ||
188 | /* don't do packet forwarding in disconnected state */ | |
189 | if (!priv->media_connected) { | |
190 | dev_err(adapter->dev, "drop packet in disconnected state.\n"); | |
191 | dev_kfree_skb_any(skb); | |
192 | return 0; | |
193 | } | |
194 | ||
195 | memcpy(ra, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN); | |
196 | ||
197 | if (is_multicast_ether_addr(ra)) { | |
198 | skb_uap = skb_copy(skb, GFP_ATOMIC); | |
199 | mwifiex_uap_queue_bridged_pkt(priv, skb_uap); | |
200 | } else { | |
201 | if (mwifiex_get_sta_entry(priv, ra)) { | |
202 | /* Requeue Intra-BSS packet */ | |
203 | mwifiex_uap_queue_bridged_pkt(priv, skb); | |
204 | return 0; | |
205 | } | |
206 | } | |
207 | ||
208 | /* Forward unicat/Inter-BSS packets to kernel. */ | |
f3b369e4 | 209 | return mwifiex_process_rx_packet(priv, skb); |
838e4f44 AP |
210 | } |
211 | ||
212 | /* | |
213 | * This function processes the packet received on AP interface. | |
214 | * | |
215 | * The function looks into the RxPD and performs sanity tests on the | |
216 | * received buffer to ensure its a valid packet before processing it | |
217 | * further. If the packet is determined to be aggregated, it is | |
218 | * de-aggregated accordingly. Then skb is passed to AP packet forwarding logic. | |
219 | * | |
220 | * The completion callback is called after processing is complete. | |
221 | */ | |
f3b369e4 | 222 | int mwifiex_process_uap_rx_packet(struct mwifiex_private *priv, |
838e4f44 AP |
223 | struct sk_buff *skb) |
224 | { | |
f3b369e4 | 225 | struct mwifiex_adapter *adapter = priv->adapter; |
838e4f44 AP |
226 | int ret; |
227 | struct uap_rxpd *uap_rx_pd; | |
838e4f44 AP |
228 | struct rx_packet_hdr *rx_pkt_hdr; |
229 | u16 rx_pkt_type; | |
d1cf3b95 AP |
230 | u8 ta[ETH_ALEN], pkt_type; |
231 | struct mwifiex_sta_node *node; | |
232 | ||
838e4f44 AP |
233 | uap_rx_pd = (struct uap_rxpd *)(skb->data); |
234 | rx_pkt_type = le16_to_cpu(uap_rx_pd->rx_pkt_type); | |
235 | rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset); | |
236 | ||
237 | if ((le16_to_cpu(uap_rx_pd->rx_pkt_offset) + | |
238 | le16_to_cpu(uap_rx_pd->rx_pkt_length)) > (u16) skb->len) { | |
239 | dev_err(adapter->dev, | |
240 | "wrong rx packet: len=%d, offset=%d, length=%d\n", | |
241 | skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset), | |
242 | le16_to_cpu(uap_rx_pd->rx_pkt_length)); | |
243 | priv->stats.rx_dropped++; | |
244 | ||
245 | if (adapter->if_ops.data_complete) | |
246 | adapter->if_ops.data_complete(adapter, skb); | |
247 | else | |
248 | dev_kfree_skb_any(skb); | |
249 | ||
250 | return 0; | |
251 | } | |
838e4f44 | 252 | |
d1cf3b95 AP |
253 | if (le16_to_cpu(uap_rx_pd->rx_pkt_type) == PKT_TYPE_AMSDU) { |
254 | struct sk_buff_head list; | |
255 | struct sk_buff *rx_skb; | |
256 | ||
257 | __skb_queue_head_init(&list); | |
258 | skb_pull(skb, le16_to_cpu(uap_rx_pd->rx_pkt_offset)); | |
259 | skb_trim(skb, le16_to_cpu(uap_rx_pd->rx_pkt_length)); | |
260 | ||
261 | ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr, | |
262 | priv->wdev->iftype, 0, false); | |
263 | ||
264 | while (!skb_queue_empty(&list)) { | |
265 | rx_skb = __skb_dequeue(&list); | |
f3b369e4 | 266 | ret = mwifiex_recv_packet(priv, rx_skb); |
d1cf3b95 AP |
267 | if (ret) |
268 | dev_err(adapter->dev, | |
269 | "AP:Rx A-MSDU failed"); | |
270 | } | |
271 | ||
272 | return 0; | |
2dbaf751 | 273 | } else if (rx_pkt_type == PKT_TYPE_MGMT) { |
f3b369e4 | 274 | ret = mwifiex_process_mgmt_packet(priv, skb); |
2dbaf751 SP |
275 | if (ret) |
276 | dev_err(adapter->dev, "Rx of mgmt packet failed"); | |
277 | dev_kfree_skb_any(skb); | |
278 | return ret; | |
d1cf3b95 AP |
279 | } |
280 | ||
281 | memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN); | |
282 | ||
283 | if (rx_pkt_type != PKT_TYPE_BAR && uap_rx_pd->priority < MAX_NUM_TID) { | |
284 | node = mwifiex_get_sta_entry(priv, ta); | |
285 | if (node) | |
286 | node->rx_seq[uap_rx_pd->priority] = | |
287 | le16_to_cpu(uap_rx_pd->seq_num); | |
288 | } | |
289 | ||
290 | if (!priv->ap_11n_enabled || | |
291 | (!mwifiex_11n_get_rx_reorder_tbl(priv, uap_rx_pd->priority, ta) && | |
292 | (le16_to_cpu(uap_rx_pd->rx_pkt_type) != PKT_TYPE_AMSDU))) { | |
293 | ret = mwifiex_handle_uap_rx_forward(priv, skb); | |
294 | return ret; | |
295 | } | |
296 | ||
297 | /* Reorder and send to kernel */ | |
298 | pkt_type = (u8)le16_to_cpu(uap_rx_pd->rx_pkt_type); | |
299 | ret = mwifiex_11n_rx_reorder_pkt(priv, le16_to_cpu(uap_rx_pd->seq_num), | |
300 | uap_rx_pd->priority, ta, pkt_type, | |
301 | skb); | |
302 | ||
303 | if (ret || (rx_pkt_type == PKT_TYPE_BAR)) { | |
838e4f44 AP |
304 | if (adapter->if_ops.data_complete) |
305 | adapter->if_ops.data_complete(adapter, skb); | |
306 | else | |
307 | dev_kfree_skb_any(skb); | |
308 | } | |
309 | ||
d1cf3b95 AP |
310 | if (ret) |
311 | priv->stats.rx_dropped++; | |
312 | ||
838e4f44 AP |
313 | return ret; |
314 | } | |
4ac8764a AP |
315 | |
316 | /* | |
317 | * This function fills the TxPD for AP tx packets. | |
318 | * | |
319 | * The Tx buffer received by this function should already have the | |
320 | * header space allocated for TxPD. | |
321 | * | |
322 | * This function inserts the TxPD in between interface header and actual | |
323 | * data and adjusts the buffer pointers accordingly. | |
324 | * | |
325 | * The following TxPD fields are set by this function, as required - | |
326 | * - BSS number | |
327 | * - Tx packet length and offset | |
328 | * - Priority | |
329 | * - Packet delay | |
330 | * - Priority specific Tx control | |
331 | * - Flags | |
332 | */ | |
333 | void *mwifiex_process_uap_txpd(struct mwifiex_private *priv, | |
334 | struct sk_buff *skb) | |
335 | { | |
336 | struct mwifiex_adapter *adapter = priv->adapter; | |
337 | struct uap_txpd *txpd; | |
338 | struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb); | |
339 | int pad, len; | |
3215215a | 340 | u16 pkt_type; |
4ac8764a AP |
341 | |
342 | if (!skb->len) { | |
343 | dev_err(adapter->dev, "Tx: bad packet length: %d\n", skb->len); | |
344 | tx_info->status_code = -1; | |
345 | return skb->data; | |
346 | } | |
347 | ||
3215215a SP |
348 | pkt_type = mwifiex_is_skb_mgmt_frame(skb) ? PKT_TYPE_MGMT : 0; |
349 | ||
4ac8764a AP |
350 | /* If skb->data is not aligned, add padding */ |
351 | pad = (4 - (((void *)skb->data - NULL) & 0x3)) % 4; | |
352 | ||
353 | len = sizeof(*txpd) + pad; | |
354 | ||
355 | BUG_ON(skb_headroom(skb) < len + INTF_HEADER_LEN); | |
356 | ||
357 | skb_push(skb, len); | |
358 | ||
359 | txpd = (struct uap_txpd *)skb->data; | |
360 | memset(txpd, 0, sizeof(*txpd)); | |
361 | txpd->bss_num = priv->bss_num; | |
362 | txpd->bss_type = priv->bss_type; | |
363 | txpd->tx_pkt_length = cpu_to_le16((u16)(skb->len - len)); | |
364 | ||
365 | txpd->priority = (u8)skb->priority; | |
366 | txpd->pkt_delay_2ms = mwifiex_wmm_compute_drv_pkt_delay(priv, skb); | |
367 | ||
368 | if (txpd->priority < ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl)) | |
369 | /* | |
370 | * Set the priority specific tx_control field, setting of 0 will | |
371 | * cause the default value to be used later in this function. | |
372 | */ | |
373 | txpd->tx_control = | |
374 | cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[txpd->priority]); | |
375 | ||
376 | /* Offset of actual data */ | |
3215215a SP |
377 | if (pkt_type == PKT_TYPE_MGMT) { |
378 | /* Set the packet type and add header for management frame */ | |
379 | txpd->tx_pkt_type = cpu_to_le16(pkt_type); | |
380 | len += MWIFIEX_MGMT_FRAME_HEADER_SIZE; | |
381 | } | |
382 | ||
4ac8764a AP |
383 | txpd->tx_pkt_offset = cpu_to_le16(len); |
384 | ||
385 | /* make space for INTF_HEADER_LEN */ | |
386 | skb_push(skb, INTF_HEADER_LEN); | |
387 | ||
388 | if (!txpd->tx_control) | |
389 | /* TxCtrl set by user or default */ | |
390 | txpd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl); | |
391 | ||
392 | return skb->data; | |
393 | } |