Commit | Line | Data |
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838e4f44 AP |
1 | /* |
2 | * Marvell Wireless LAN device driver: AP TX and RX data handling | |
3 | * | |
65da33f5 | 4 | * Copyright (C) 2012-2014, Marvell International Ltd. |
838e4f44 AP |
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; | |
057d32f0 | 99 | struct timeval tv; |
8d93f1f3 | 100 | struct ethhdr *p_ethhdr; |
838e4f44 AP |
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 | ||
c613d16f AK |
114 | if ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header, |
115 | sizeof(bridge_tunnel_header))) || | |
116 | (!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header, | |
117 | sizeof(rfc1042_header)) && | |
118 | ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_AARP && | |
119 | ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_IPX)) { | |
8d93f1f3 UR |
120 | /* Replace the 803 header and rfc1042 header (llc/snap) with |
121 | * an Ethernet II header, keep the src/dst and snap_type | |
122 | * (ethertype). | |
123 | * | |
124 | * The firmware only passes up SNAP frames converting all RX | |
125 | * data from 802.11 to 802.2/LLC/SNAP frames. | |
126 | * | |
127 | * To create the Ethernet II, just move the src, dst address | |
128 | * right before the snap_type. | |
129 | */ | |
130 | p_ethhdr = (struct ethhdr *) | |
131 | ((u8 *)(&rx_pkt_hdr->eth803_hdr) | |
132 | + sizeof(rx_pkt_hdr->eth803_hdr) | |
133 | + sizeof(rx_pkt_hdr->rfc1042_hdr) | |
134 | - sizeof(rx_pkt_hdr->eth803_hdr.h_dest) | |
135 | - sizeof(rx_pkt_hdr->eth803_hdr.h_source) | |
136 | - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type)); | |
137 | memcpy(p_ethhdr->h_source, rx_pkt_hdr->eth803_hdr.h_source, | |
138 | sizeof(p_ethhdr->h_source)); | |
139 | memcpy(p_ethhdr->h_dest, rx_pkt_hdr->eth803_hdr.h_dest, | |
140 | sizeof(p_ethhdr->h_dest)); | |
838e4f44 AP |
141 | /* Chop off the rxpd + the excess memory from |
142 | * 802.2/llc/snap header that was removed. | |
143 | */ | |
8d93f1f3 UR |
144 | hdr_chop = (u8 *)p_ethhdr - (u8 *)uap_rx_pd; |
145 | } else { | |
838e4f44 AP |
146 | /* Chop off the rxpd */ |
147 | hdr_chop = (u8 *)&rx_pkt_hdr->eth803_hdr - (u8 *)uap_rx_pd; | |
8d93f1f3 | 148 | } |
838e4f44 | 149 | |
f7b59853 | 150 | /* Chop off the leading header bytes so that it points |
838e4f44 AP |
151 | * to the start of either the reconstructed EthII frame |
152 | * or the 802.2/llc/snap frame. | |
153 | */ | |
154 | skb_pull(skb, hdr_chop); | |
155 | ||
156 | if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) { | |
157 | dev_dbg(priv->adapter->dev, | |
158 | "data: Tx: insufficient skb headroom %d\n", | |
159 | skb_headroom(skb)); | |
160 | /* Insufficient skb headroom - allocate a new skb */ | |
161 | new_skb = | |
162 | skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN); | |
163 | if (unlikely(!new_skb)) { | |
164 | dev_err(priv->adapter->dev, | |
165 | "Tx: cannot allocate new_skb\n"); | |
166 | kfree_skb(skb); | |
167 | priv->stats.tx_dropped++; | |
168 | return; | |
169 | } | |
170 | ||
171 | kfree_skb(skb); | |
172 | skb = new_skb; | |
173 | dev_dbg(priv->adapter->dev, "info: new skb headroom %d\n", | |
174 | skb_headroom(skb)); | |
175 | } | |
176 | ||
177 | tx_info = MWIFIEX_SKB_TXCB(skb); | |
178 | tx_info->bss_num = priv->bss_num; | |
179 | tx_info->bss_type = priv->bss_type; | |
180 | tx_info->flags |= MWIFIEX_BUF_FLAG_BRIDGED_PKT; | |
181 | ||
f7b59853 UR |
182 | if (is_unicast_ether_addr(rx_pkt_hdr->eth803_hdr.h_dest)) { |
183 | /* Update bridge packet statistics as the | |
184 | * packet is not going to kernel/upper layer. | |
185 | */ | |
186 | priv->stats.rx_bytes += skb->len; | |
187 | priv->stats.rx_packets++; | |
188 | ||
189 | /* Sending bridge packet to TX queue, so save the packet | |
190 | * length in TXCB to update statistics in TX complete. | |
191 | */ | |
192 | tx_info->pkt_len = skb->len; | |
193 | } | |
194 | ||
057d32f0 BZ |
195 | do_gettimeofday(&tv); |
196 | skb->tstamp = timeval_to_ktime(tv); | |
838e4f44 AP |
197 | mwifiex_wmm_add_buf_txqueue(priv, skb); |
198 | atomic_inc(&adapter->tx_pending); | |
199 | atomic_inc(&adapter->pending_bridged_pkts); | |
200 | ||
838e4f44 AP |
201 | return; |
202 | } | |
203 | ||
204 | /* | |
205 | * This function contains logic for AP packet forwarding. | |
206 | * | |
207 | * If a packet is multicast/broadcast, it is sent to kernel/upper layer | |
208 | * as well as queued back to AP TX queue so that it can be sent to other | |
209 | * associated stations. | |
210 | * If a packet is unicast and RA is present in associated station list, | |
211 | * it is again requeued into AP TX queue. | |
212 | * If a packet is unicast and RA is not in associated station list, | |
213 | * packet is forwarded to kernel to handle routing logic. | |
214 | */ | |
215 | int mwifiex_handle_uap_rx_forward(struct mwifiex_private *priv, | |
216 | struct sk_buff *skb) | |
217 | { | |
218 | struct mwifiex_adapter *adapter = priv->adapter; | |
219 | struct uap_rxpd *uap_rx_pd; | |
220 | struct rx_packet_hdr *rx_pkt_hdr; | |
221 | u8 ra[ETH_ALEN]; | |
222 | struct sk_buff *skb_uap; | |
223 | ||
224 | uap_rx_pd = (struct uap_rxpd *)(skb->data); | |
225 | rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset); | |
226 | ||
227 | /* don't do packet forwarding in disconnected state */ | |
228 | if (!priv->media_connected) { | |
229 | dev_err(adapter->dev, "drop packet in disconnected state.\n"); | |
230 | dev_kfree_skb_any(skb); | |
231 | return 0; | |
232 | } | |
233 | ||
234 | memcpy(ra, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN); | |
235 | ||
236 | if (is_multicast_ether_addr(ra)) { | |
237 | skb_uap = skb_copy(skb, GFP_ATOMIC); | |
238 | mwifiex_uap_queue_bridged_pkt(priv, skb_uap); | |
239 | } else { | |
240 | if (mwifiex_get_sta_entry(priv, ra)) { | |
241 | /* Requeue Intra-BSS packet */ | |
242 | mwifiex_uap_queue_bridged_pkt(priv, skb); | |
243 | return 0; | |
244 | } | |
245 | } | |
246 | ||
247 | /* Forward unicat/Inter-BSS packets to kernel. */ | |
f3b369e4 | 248 | return mwifiex_process_rx_packet(priv, skb); |
838e4f44 AP |
249 | } |
250 | ||
251 | /* | |
252 | * This function processes the packet received on AP interface. | |
253 | * | |
254 | * The function looks into the RxPD and performs sanity tests on the | |
255 | * received buffer to ensure its a valid packet before processing it | |
256 | * further. If the packet is determined to be aggregated, it is | |
257 | * de-aggregated accordingly. Then skb is passed to AP packet forwarding logic. | |
258 | * | |
259 | * The completion callback is called after processing is complete. | |
260 | */ | |
f3b369e4 | 261 | int mwifiex_process_uap_rx_packet(struct mwifiex_private *priv, |
838e4f44 AP |
262 | struct sk_buff *skb) |
263 | { | |
f3b369e4 | 264 | struct mwifiex_adapter *adapter = priv->adapter; |
838e4f44 AP |
265 | int ret; |
266 | struct uap_rxpd *uap_rx_pd; | |
838e4f44 AP |
267 | struct rx_packet_hdr *rx_pkt_hdr; |
268 | u16 rx_pkt_type; | |
d1cf3b95 AP |
269 | u8 ta[ETH_ALEN], pkt_type; |
270 | struct mwifiex_sta_node *node; | |
271 | ||
838e4f44 AP |
272 | uap_rx_pd = (struct uap_rxpd *)(skb->data); |
273 | rx_pkt_type = le16_to_cpu(uap_rx_pd->rx_pkt_type); | |
274 | rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset); | |
275 | ||
276 | if ((le16_to_cpu(uap_rx_pd->rx_pkt_offset) + | |
277 | le16_to_cpu(uap_rx_pd->rx_pkt_length)) > (u16) skb->len) { | |
278 | dev_err(adapter->dev, | |
279 | "wrong rx packet: len=%d, offset=%d, length=%d\n", | |
280 | skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset), | |
281 | le16_to_cpu(uap_rx_pd->rx_pkt_length)); | |
282 | priv->stats.rx_dropped++; | |
ca8d6dfc | 283 | dev_kfree_skb_any(skb); |
838e4f44 AP |
284 | return 0; |
285 | } | |
838e4f44 | 286 | |
4c9f9fb2 | 287 | if (rx_pkt_type == PKT_TYPE_MGMT) { |
f3b369e4 | 288 | ret = mwifiex_process_mgmt_packet(priv, skb); |
2dbaf751 SP |
289 | if (ret) |
290 | dev_err(adapter->dev, "Rx of mgmt packet failed"); | |
291 | dev_kfree_skb_any(skb); | |
292 | return ret; | |
d1cf3b95 AP |
293 | } |
294 | ||
295 | memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN); | |
296 | ||
297 | if (rx_pkt_type != PKT_TYPE_BAR && uap_rx_pd->priority < MAX_NUM_TID) { | |
298 | node = mwifiex_get_sta_entry(priv, ta); | |
299 | if (node) | |
300 | node->rx_seq[uap_rx_pd->priority] = | |
301 | le16_to_cpu(uap_rx_pd->seq_num); | |
302 | } | |
303 | ||
304 | if (!priv->ap_11n_enabled || | |
305 | (!mwifiex_11n_get_rx_reorder_tbl(priv, uap_rx_pd->priority, ta) && | |
306 | (le16_to_cpu(uap_rx_pd->rx_pkt_type) != PKT_TYPE_AMSDU))) { | |
307 | ret = mwifiex_handle_uap_rx_forward(priv, skb); | |
308 | return ret; | |
309 | } | |
310 | ||
311 | /* Reorder and send to kernel */ | |
312 | pkt_type = (u8)le16_to_cpu(uap_rx_pd->rx_pkt_type); | |
313 | ret = mwifiex_11n_rx_reorder_pkt(priv, le16_to_cpu(uap_rx_pd->seq_num), | |
314 | uap_rx_pd->priority, ta, pkt_type, | |
315 | skb); | |
316 | ||
ca8d6dfc UR |
317 | if (ret || (rx_pkt_type == PKT_TYPE_BAR)) |
318 | dev_kfree_skb_any(skb); | |
838e4f44 | 319 | |
d1cf3b95 AP |
320 | if (ret) |
321 | priv->stats.rx_dropped++; | |
322 | ||
838e4f44 AP |
323 | return ret; |
324 | } | |
4ac8764a AP |
325 | |
326 | /* | |
327 | * This function fills the TxPD for AP tx packets. | |
328 | * | |
329 | * The Tx buffer received by this function should already have the | |
330 | * header space allocated for TxPD. | |
331 | * | |
332 | * This function inserts the TxPD in between interface header and actual | |
333 | * data and adjusts the buffer pointers accordingly. | |
334 | * | |
335 | * The following TxPD fields are set by this function, as required - | |
336 | * - BSS number | |
337 | * - Tx packet length and offset | |
338 | * - Priority | |
339 | * - Packet delay | |
340 | * - Priority specific Tx control | |
341 | * - Flags | |
342 | */ | |
343 | void *mwifiex_process_uap_txpd(struct mwifiex_private *priv, | |
344 | struct sk_buff *skb) | |
345 | { | |
346 | struct mwifiex_adapter *adapter = priv->adapter; | |
347 | struct uap_txpd *txpd; | |
348 | struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb); | |
349 | int pad, len; | |
3215215a | 350 | u16 pkt_type; |
4ac8764a AP |
351 | |
352 | if (!skb->len) { | |
353 | dev_err(adapter->dev, "Tx: bad packet length: %d\n", skb->len); | |
354 | tx_info->status_code = -1; | |
355 | return skb->data; | |
356 | } | |
357 | ||
3215215a SP |
358 | pkt_type = mwifiex_is_skb_mgmt_frame(skb) ? PKT_TYPE_MGMT : 0; |
359 | ||
4ac8764a AP |
360 | /* If skb->data is not aligned, add padding */ |
361 | pad = (4 - (((void *)skb->data - NULL) & 0x3)) % 4; | |
362 | ||
363 | len = sizeof(*txpd) + pad; | |
364 | ||
365 | BUG_ON(skb_headroom(skb) < len + INTF_HEADER_LEN); | |
366 | ||
367 | skb_push(skb, len); | |
368 | ||
369 | txpd = (struct uap_txpd *)skb->data; | |
370 | memset(txpd, 0, sizeof(*txpd)); | |
371 | txpd->bss_num = priv->bss_num; | |
372 | txpd->bss_type = priv->bss_type; | |
373 | txpd->tx_pkt_length = cpu_to_le16((u16)(skb->len - len)); | |
374 | ||
375 | txpd->priority = (u8)skb->priority; | |
376 | txpd->pkt_delay_2ms = mwifiex_wmm_compute_drv_pkt_delay(priv, skb); | |
377 | ||
378 | if (txpd->priority < ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl)) | |
379 | /* | |
380 | * Set the priority specific tx_control field, setting of 0 will | |
381 | * cause the default value to be used later in this function. | |
382 | */ | |
383 | txpd->tx_control = | |
384 | cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[txpd->priority]); | |
385 | ||
386 | /* Offset of actual data */ | |
3215215a SP |
387 | if (pkt_type == PKT_TYPE_MGMT) { |
388 | /* Set the packet type and add header for management frame */ | |
389 | txpd->tx_pkt_type = cpu_to_le16(pkt_type); | |
390 | len += MWIFIEX_MGMT_FRAME_HEADER_SIZE; | |
391 | } | |
392 | ||
4ac8764a AP |
393 | txpd->tx_pkt_offset = cpu_to_le16(len); |
394 | ||
395 | /* make space for INTF_HEADER_LEN */ | |
396 | skb_push(skb, INTF_HEADER_LEN); | |
397 | ||
398 | if (!txpd->tx_control) | |
399 | /* TxCtrl set by user or default */ | |
400 | txpd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl); | |
401 | ||
402 | return skb->data; | |
403 | } |