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; | |
8d93f1f3 | 99 | struct ethhdr *p_ethhdr; |
838e4f44 AP |
100 | |
101 | uap_rx_pd = (struct uap_rxpd *)(skb->data); | |
102 | rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset); | |
103 | ||
104 | if ((atomic_read(&adapter->pending_bridged_pkts) >= | |
61c87304 | 105 | MWIFIEX_BRIDGED_PKTS_THR_HIGH)) { |
838e4f44 AP |
106 | dev_err(priv->adapter->dev, |
107 | "Tx: Bridge packet limit reached. Drop packet!\n"); | |
108 | kfree_skb(skb); | |
61c87304 | 109 | mwifiex_uap_cleanup_tx_queues(priv); |
838e4f44 AP |
110 | return; |
111 | } | |
112 | ||
c613d16f AK |
113 | if ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header, |
114 | sizeof(bridge_tunnel_header))) || | |
115 | (!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header, | |
116 | sizeof(rfc1042_header)) && | |
117 | ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_AARP && | |
118 | ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_IPX)) { | |
8d93f1f3 UR |
119 | /* Replace the 803 header and rfc1042 header (llc/snap) with |
120 | * an Ethernet II header, keep the src/dst and snap_type | |
121 | * (ethertype). | |
122 | * | |
123 | * The firmware only passes up SNAP frames converting all RX | |
124 | * data from 802.11 to 802.2/LLC/SNAP frames. | |
125 | * | |
126 | * To create the Ethernet II, just move the src, dst address | |
127 | * right before the snap_type. | |
128 | */ | |
129 | p_ethhdr = (struct ethhdr *) | |
130 | ((u8 *)(&rx_pkt_hdr->eth803_hdr) | |
131 | + sizeof(rx_pkt_hdr->eth803_hdr) | |
132 | + sizeof(rx_pkt_hdr->rfc1042_hdr) | |
133 | - sizeof(rx_pkt_hdr->eth803_hdr.h_dest) | |
134 | - sizeof(rx_pkt_hdr->eth803_hdr.h_source) | |
135 | - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type)); | |
136 | memcpy(p_ethhdr->h_source, rx_pkt_hdr->eth803_hdr.h_source, | |
137 | sizeof(p_ethhdr->h_source)); | |
138 | memcpy(p_ethhdr->h_dest, rx_pkt_hdr->eth803_hdr.h_dest, | |
139 | sizeof(p_ethhdr->h_dest)); | |
838e4f44 AP |
140 | /* Chop off the rxpd + the excess memory from |
141 | * 802.2/llc/snap header that was removed. | |
142 | */ | |
8d93f1f3 UR |
143 | hdr_chop = (u8 *)p_ethhdr - (u8 *)uap_rx_pd; |
144 | } else { | |
838e4f44 AP |
145 | /* Chop off the rxpd */ |
146 | hdr_chop = (u8 *)&rx_pkt_hdr->eth803_hdr - (u8 *)uap_rx_pd; | |
8d93f1f3 | 147 | } |
838e4f44 | 148 | |
f7b59853 | 149 | /* Chop off the leading header bytes so that it points |
838e4f44 AP |
150 | * to the start of either the reconstructed EthII frame |
151 | * or the 802.2/llc/snap frame. | |
152 | */ | |
153 | skb_pull(skb, hdr_chop); | |
154 | ||
155 | if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) { | |
156 | dev_dbg(priv->adapter->dev, | |
157 | "data: Tx: insufficient skb headroom %d\n", | |
158 | skb_headroom(skb)); | |
159 | /* Insufficient skb headroom - allocate a new skb */ | |
160 | new_skb = | |
161 | skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN); | |
162 | if (unlikely(!new_skb)) { | |
163 | dev_err(priv->adapter->dev, | |
164 | "Tx: cannot allocate new_skb\n"); | |
165 | kfree_skb(skb); | |
166 | priv->stats.tx_dropped++; | |
167 | return; | |
168 | } | |
169 | ||
170 | kfree_skb(skb); | |
171 | skb = new_skb; | |
172 | dev_dbg(priv->adapter->dev, "info: new skb headroom %d\n", | |
173 | skb_headroom(skb)); | |
174 | } | |
175 | ||
176 | tx_info = MWIFIEX_SKB_TXCB(skb); | |
177 | tx_info->bss_num = priv->bss_num; | |
178 | tx_info->bss_type = priv->bss_type; | |
179 | tx_info->flags |= MWIFIEX_BUF_FLAG_BRIDGED_PKT; | |
180 | ||
f7b59853 UR |
181 | if (is_unicast_ether_addr(rx_pkt_hdr->eth803_hdr.h_dest)) { |
182 | /* Update bridge packet statistics as the | |
183 | * packet is not going to kernel/upper layer. | |
184 | */ | |
185 | priv->stats.rx_bytes += skb->len; | |
186 | priv->stats.rx_packets++; | |
187 | ||
188 | /* Sending bridge packet to TX queue, so save the packet | |
189 | * length in TXCB to update statistics in TX complete. | |
190 | */ | |
191 | tx_info->pkt_len = skb->len; | |
192 | } | |
193 | ||
6451acdc | 194 | __net_timestamp(skb); |
838e4f44 AP |
195 | mwifiex_wmm_add_buf_txqueue(priv, skb); |
196 | atomic_inc(&adapter->tx_pending); | |
197 | atomic_inc(&adapter->pending_bridged_pkts); | |
198 | ||
838e4f44 AP |
199 | return; |
200 | } | |
201 | ||
202 | /* | |
203 | * This function contains logic for AP packet forwarding. | |
204 | * | |
205 | * If a packet is multicast/broadcast, it is sent to kernel/upper layer | |
206 | * as well as queued back to AP TX queue so that it can be sent to other | |
207 | * associated stations. | |
208 | * If a packet is unicast and RA is present in associated station list, | |
209 | * it is again requeued into AP TX queue. | |
210 | * If a packet is unicast and RA is not in associated station list, | |
211 | * packet is forwarded to kernel to handle routing logic. | |
212 | */ | |
213 | int mwifiex_handle_uap_rx_forward(struct mwifiex_private *priv, | |
214 | struct sk_buff *skb) | |
215 | { | |
216 | struct mwifiex_adapter *adapter = priv->adapter; | |
217 | struct uap_rxpd *uap_rx_pd; | |
218 | struct rx_packet_hdr *rx_pkt_hdr; | |
219 | u8 ra[ETH_ALEN]; | |
220 | struct sk_buff *skb_uap; | |
221 | ||
222 | uap_rx_pd = (struct uap_rxpd *)(skb->data); | |
223 | rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset); | |
224 | ||
225 | /* don't do packet forwarding in disconnected state */ | |
226 | if (!priv->media_connected) { | |
227 | dev_err(adapter->dev, "drop packet in disconnected state.\n"); | |
228 | dev_kfree_skb_any(skb); | |
229 | return 0; | |
230 | } | |
231 | ||
232 | memcpy(ra, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN); | |
233 | ||
234 | if (is_multicast_ether_addr(ra)) { | |
235 | skb_uap = skb_copy(skb, GFP_ATOMIC); | |
236 | mwifiex_uap_queue_bridged_pkt(priv, skb_uap); | |
237 | } else { | |
238 | if (mwifiex_get_sta_entry(priv, ra)) { | |
239 | /* Requeue Intra-BSS packet */ | |
240 | mwifiex_uap_queue_bridged_pkt(priv, skb); | |
241 | return 0; | |
242 | } | |
243 | } | |
244 | ||
245 | /* Forward unicat/Inter-BSS packets to kernel. */ | |
f3b369e4 | 246 | return mwifiex_process_rx_packet(priv, skb); |
838e4f44 AP |
247 | } |
248 | ||
249 | /* | |
250 | * This function processes the packet received on AP interface. | |
251 | * | |
252 | * The function looks into the RxPD and performs sanity tests on the | |
253 | * received buffer to ensure its a valid packet before processing it | |
254 | * further. If the packet is determined to be aggregated, it is | |
255 | * de-aggregated accordingly. Then skb is passed to AP packet forwarding logic. | |
256 | * | |
257 | * The completion callback is called after processing is complete. | |
258 | */ | |
f3b369e4 | 259 | int mwifiex_process_uap_rx_packet(struct mwifiex_private *priv, |
838e4f44 AP |
260 | struct sk_buff *skb) |
261 | { | |
f3b369e4 | 262 | struct mwifiex_adapter *adapter = priv->adapter; |
838e4f44 AP |
263 | int ret; |
264 | struct uap_rxpd *uap_rx_pd; | |
838e4f44 AP |
265 | struct rx_packet_hdr *rx_pkt_hdr; |
266 | u16 rx_pkt_type; | |
d1cf3b95 AP |
267 | u8 ta[ETH_ALEN], pkt_type; |
268 | struct mwifiex_sta_node *node; | |
269 | ||
838e4f44 AP |
270 | uap_rx_pd = (struct uap_rxpd *)(skb->data); |
271 | rx_pkt_type = le16_to_cpu(uap_rx_pd->rx_pkt_type); | |
272 | rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset); | |
273 | ||
274 | if ((le16_to_cpu(uap_rx_pd->rx_pkt_offset) + | |
275 | le16_to_cpu(uap_rx_pd->rx_pkt_length)) > (u16) skb->len) { | |
276 | dev_err(adapter->dev, | |
277 | "wrong rx packet: len=%d, offset=%d, length=%d\n", | |
278 | skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset), | |
279 | le16_to_cpu(uap_rx_pd->rx_pkt_length)); | |
280 | priv->stats.rx_dropped++; | |
ca8d6dfc | 281 | dev_kfree_skb_any(skb); |
838e4f44 AP |
282 | return 0; |
283 | } | |
838e4f44 | 284 | |
4c9f9fb2 | 285 | if (rx_pkt_type == PKT_TYPE_MGMT) { |
f3b369e4 | 286 | ret = mwifiex_process_mgmt_packet(priv, skb); |
2dbaf751 SP |
287 | if (ret) |
288 | dev_err(adapter->dev, "Rx of mgmt packet failed"); | |
289 | dev_kfree_skb_any(skb); | |
290 | return ret; | |
d1cf3b95 AP |
291 | } |
292 | ||
293 | memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN); | |
294 | ||
295 | if (rx_pkt_type != PKT_TYPE_BAR && uap_rx_pd->priority < MAX_NUM_TID) { | |
296 | node = mwifiex_get_sta_entry(priv, ta); | |
297 | if (node) | |
298 | node->rx_seq[uap_rx_pd->priority] = | |
299 | le16_to_cpu(uap_rx_pd->seq_num); | |
300 | } | |
301 | ||
302 | if (!priv->ap_11n_enabled || | |
303 | (!mwifiex_11n_get_rx_reorder_tbl(priv, uap_rx_pd->priority, ta) && | |
304 | (le16_to_cpu(uap_rx_pd->rx_pkt_type) != PKT_TYPE_AMSDU))) { | |
305 | ret = mwifiex_handle_uap_rx_forward(priv, skb); | |
306 | return ret; | |
307 | } | |
308 | ||
309 | /* Reorder and send to kernel */ | |
310 | pkt_type = (u8)le16_to_cpu(uap_rx_pd->rx_pkt_type); | |
311 | ret = mwifiex_11n_rx_reorder_pkt(priv, le16_to_cpu(uap_rx_pd->seq_num), | |
312 | uap_rx_pd->priority, ta, pkt_type, | |
313 | skb); | |
314 | ||
ca8d6dfc UR |
315 | if (ret || (rx_pkt_type == PKT_TYPE_BAR)) |
316 | dev_kfree_skb_any(skb); | |
838e4f44 | 317 | |
d1cf3b95 AP |
318 | if (ret) |
319 | priv->stats.rx_dropped++; | |
320 | ||
838e4f44 AP |
321 | return ret; |
322 | } | |
4ac8764a AP |
323 | |
324 | /* | |
325 | * This function fills the TxPD for AP tx packets. | |
326 | * | |
327 | * The Tx buffer received by this function should already have the | |
328 | * header space allocated for TxPD. | |
329 | * | |
330 | * This function inserts the TxPD in between interface header and actual | |
331 | * data and adjusts the buffer pointers accordingly. | |
332 | * | |
333 | * The following TxPD fields are set by this function, as required - | |
334 | * - BSS number | |
335 | * - Tx packet length and offset | |
336 | * - Priority | |
337 | * - Packet delay | |
338 | * - Priority specific Tx control | |
339 | * - Flags | |
340 | */ | |
341 | void *mwifiex_process_uap_txpd(struct mwifiex_private *priv, | |
342 | struct sk_buff *skb) | |
343 | { | |
344 | struct mwifiex_adapter *adapter = priv->adapter; | |
345 | struct uap_txpd *txpd; | |
346 | struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb); | |
347 | int pad, len; | |
3215215a | 348 | u16 pkt_type; |
4ac8764a AP |
349 | |
350 | if (!skb->len) { | |
351 | dev_err(adapter->dev, "Tx: bad packet length: %d\n", skb->len); | |
352 | tx_info->status_code = -1; | |
353 | return skb->data; | |
354 | } | |
355 | ||
3215215a SP |
356 | pkt_type = mwifiex_is_skb_mgmt_frame(skb) ? PKT_TYPE_MGMT : 0; |
357 | ||
4ac8764a AP |
358 | /* If skb->data is not aligned, add padding */ |
359 | pad = (4 - (((void *)skb->data - NULL) & 0x3)) % 4; | |
360 | ||
361 | len = sizeof(*txpd) + pad; | |
362 | ||
363 | BUG_ON(skb_headroom(skb) < len + INTF_HEADER_LEN); | |
364 | ||
365 | skb_push(skb, len); | |
366 | ||
367 | txpd = (struct uap_txpd *)skb->data; | |
368 | memset(txpd, 0, sizeof(*txpd)); | |
369 | txpd->bss_num = priv->bss_num; | |
370 | txpd->bss_type = priv->bss_type; | |
371 | txpd->tx_pkt_length = cpu_to_le16((u16)(skb->len - len)); | |
372 | ||
373 | txpd->priority = (u8)skb->priority; | |
374 | txpd->pkt_delay_2ms = mwifiex_wmm_compute_drv_pkt_delay(priv, skb); | |
375 | ||
376 | if (txpd->priority < ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl)) | |
377 | /* | |
378 | * Set the priority specific tx_control field, setting of 0 will | |
379 | * cause the default value to be used later in this function. | |
380 | */ | |
381 | txpd->tx_control = | |
382 | cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[txpd->priority]); | |
383 | ||
384 | /* Offset of actual data */ | |
3215215a SP |
385 | if (pkt_type == PKT_TYPE_MGMT) { |
386 | /* Set the packet type and add header for management frame */ | |
387 | txpd->tx_pkt_type = cpu_to_le16(pkt_type); | |
388 | len += MWIFIEX_MGMT_FRAME_HEADER_SIZE; | |
389 | } | |
390 | ||
4ac8764a AP |
391 | txpd->tx_pkt_offset = cpu_to_le16(len); |
392 | ||
393 | /* make space for INTF_HEADER_LEN */ | |
394 | skb_push(skb, INTF_HEADER_LEN); | |
395 | ||
396 | if (!txpd->tx_control) | |
397 | /* TxCtrl set by user or default */ | |
398 | txpd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl); | |
399 | ||
400 | return skb->data; | |
401 | } |