1 /*
2 * Marvell Wireless LAN device driver: AP TX and RX data handling
3 *
4 * Copyright (C) 2012-2014, 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"
24 #include "11n_aggr.h"
25 #include "11n_rxreorder.h"
26
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
mwifiex_uap_del_tx_pkts_in_ralist(struct mwifiex_private * priv,struct list_head * ra_list_head,int tid)33 mwifiex_uap_del_tx_pkts_in_ralist(struct mwifiex_private *priv,
34 struct list_head *ra_list_head,
35 int tid)
36 {
37 struct mwifiex_ra_list_tbl *ra_list;
38 struct sk_buff *skb, *tmp;
39 bool pkt_deleted = false;
40 struct mwifiex_txinfo *tx_info;
41 struct mwifiex_adapter *adapter = priv->adapter;
42
43 list_for_each_entry(ra_list, ra_list_head, list) {
44 if (skb_queue_empty(&ra_list->skb_head))
45 continue;
46
47 skb_queue_walk_safe(&ra_list->skb_head, skb, tmp) {
48 tx_info = MWIFIEX_SKB_TXCB(skb);
49 if (tx_info->flags & MWIFIEX_BUF_FLAG_BRIDGED_PKT) {
50 __skb_unlink(skb, &ra_list->skb_head);
51 mwifiex_write_data_complete(adapter, skb, 0,
52 -1);
53 if (ra_list->tx_paused)
54 priv->wmm.pkts_paused[tid]--;
55 else
56 atomic_dec(&priv->wmm.tx_pkts_queued);
57 pkt_deleted = true;
58 }
59 if ((atomic_read(&adapter->pending_bridged_pkts) <=
60 MWIFIEX_BRIDGED_PKTS_THR_LOW))
61 break;
62 }
63 }
64
65 return pkt_deleted;
66 }
67
68 /* This function deletes packets from particular RA List. RA list index
69 * from which packets are deleted is preserved so that packets from next RA
70 * list are deleted upon subsequent call thus maintaining fairness.
71 */
mwifiex_uap_cleanup_tx_queues(struct mwifiex_private * priv)72 static void mwifiex_uap_cleanup_tx_queues(struct mwifiex_private *priv)
73 {
74 unsigned long flags;
75 struct list_head *ra_list;
76 int i;
77
78 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
79
80 for (i = 0; i < MAX_NUM_TID; i++, priv->del_list_idx++) {
81 if (priv->del_list_idx == MAX_NUM_TID)
82 priv->del_list_idx = 0;
83 ra_list = &priv->wmm.tid_tbl_ptr[priv->del_list_idx].ra_list;
84 if (mwifiex_uap_del_tx_pkts_in_ralist(priv, ra_list, i)) {
85 priv->del_list_idx++;
86 break;
87 }
88 }
89
90 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
91 }
92
93
mwifiex_uap_queue_bridged_pkt(struct mwifiex_private * priv,struct sk_buff * skb)94 static void mwifiex_uap_queue_bridged_pkt(struct mwifiex_private *priv,
95 struct sk_buff *skb)
96 {
97 struct mwifiex_adapter *adapter = priv->adapter;
98 struct uap_rxpd *uap_rx_pd;
99 struct rx_packet_hdr *rx_pkt_hdr;
100 struct sk_buff *new_skb;
101 struct mwifiex_txinfo *tx_info;
102 int hdr_chop;
103 struct ethhdr *p_ethhdr;
104 struct mwifiex_sta_node *src_node;
105 int index;
106
107 uap_rx_pd = (struct uap_rxpd *)(skb->data);
108 rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
109
110 if ((atomic_read(&adapter->pending_bridged_pkts) >=
111 MWIFIEX_BRIDGED_PKTS_THR_HIGH)) {
112 mwifiex_dbg(priv->adapter, ERROR,
113 "Tx: Bridge packet limit reached. Drop packet!\n");
114 kfree_skb(skb);
115 mwifiex_uap_cleanup_tx_queues(priv);
116 return;
117 }
118
119 if ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header,
120 sizeof(bridge_tunnel_header))) ||
121 (!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header,
122 sizeof(rfc1042_header)) &&
123 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_AARP &&
124 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_IPX)) {
125 /* Replace the 803 header and rfc1042 header (llc/snap) with
126 * an Ethernet II header, keep the src/dst and snap_type
127 * (ethertype).
128 *
129 * The firmware only passes up SNAP frames converting all RX
130 * data from 802.11 to 802.2/LLC/SNAP frames.
131 *
132 * To create the Ethernet II, just move the src, dst address
133 * right before the snap_type.
134 */
135 p_ethhdr = (struct ethhdr *)
136 ((u8 *)(&rx_pkt_hdr->eth803_hdr)
137 + sizeof(rx_pkt_hdr->eth803_hdr)
138 + sizeof(rx_pkt_hdr->rfc1042_hdr)
139 - sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
140 - sizeof(rx_pkt_hdr->eth803_hdr.h_source)
141 - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
142 memcpy(p_ethhdr->h_source, rx_pkt_hdr->eth803_hdr.h_source,
143 sizeof(p_ethhdr->h_source));
144 memcpy(p_ethhdr->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
145 sizeof(p_ethhdr->h_dest));
146 /* Chop off the rxpd + the excess memory from
147 * 802.2/llc/snap header that was removed.
148 */
149 hdr_chop = (u8 *)p_ethhdr - (u8 *)uap_rx_pd;
150 } else {
151 /* Chop off the rxpd */
152 hdr_chop = (u8 *)&rx_pkt_hdr->eth803_hdr - (u8 *)uap_rx_pd;
153 }
154
155 /* Chop off the leading header bytes so that it points
156 * to the start of either the reconstructed EthII frame
157 * or the 802.2/llc/snap frame.
158 */
159 skb_pull(skb, hdr_chop);
160
161 if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) {
162 mwifiex_dbg(priv->adapter, ERROR,
163 "data: Tx: insufficient skb headroom %d\n",
164 skb_headroom(skb));
165 /* Insufficient skb headroom - allocate a new skb */
166 new_skb =
167 skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN);
168 if (unlikely(!new_skb)) {
169 mwifiex_dbg(priv->adapter, ERROR,
170 "Tx: cannot allocate new_skb\n");
171 kfree_skb(skb);
172 priv->stats.tx_dropped++;
173 return;
174 }
175
176 kfree_skb(skb);
177 skb = new_skb;
178 mwifiex_dbg(priv->adapter, INFO,
179 "info: new skb headroom %d\n",
180 skb_headroom(skb));
181 }
182
183 tx_info = MWIFIEX_SKB_TXCB(skb);
184 memset(tx_info, 0, sizeof(*tx_info));
185 tx_info->bss_num = priv->bss_num;
186 tx_info->bss_type = priv->bss_type;
187 tx_info->flags |= MWIFIEX_BUF_FLAG_BRIDGED_PKT;
188
189 src_node = mwifiex_get_sta_entry(priv, rx_pkt_hdr->eth803_hdr.h_source);
190 if (src_node) {
191 src_node->stats.last_rx = jiffies;
192 src_node->stats.rx_bytes += skb->len;
193 src_node->stats.rx_packets++;
194 src_node->stats.last_tx_rate = uap_rx_pd->rx_rate;
195 src_node->stats.last_tx_htinfo = uap_rx_pd->ht_info;
196 }
197
198 if (is_unicast_ether_addr(rx_pkt_hdr->eth803_hdr.h_dest)) {
199 /* Update bridge packet statistics as the
200 * packet is not going to kernel/upper layer.
201 */
202 priv->stats.rx_bytes += skb->len;
203 priv->stats.rx_packets++;
204
205 /* Sending bridge packet to TX queue, so save the packet
206 * length in TXCB to update statistics in TX complete.
207 */
208 tx_info->pkt_len = skb->len;
209 }
210
211 __net_timestamp(skb);
212
213 index = mwifiex_1d_to_wmm_queue[skb->priority];
214 atomic_inc(&priv->wmm_tx_pending[index]);
215 mwifiex_wmm_add_buf_txqueue(priv, skb);
216 atomic_inc(&adapter->tx_pending);
217 atomic_inc(&adapter->pending_bridged_pkts);
218
219 mwifiex_queue_main_work(priv->adapter);
220
221 return;
222 }
223
224 /*
225 * This function contains logic for AP packet forwarding.
226 *
227 * If a packet is multicast/broadcast, it is sent to kernel/upper layer
228 * as well as queued back to AP TX queue so that it can be sent to other
229 * associated stations.
230 * If a packet is unicast and RA is present in associated station list,
231 * it is again requeued into AP TX queue.
232 * If a packet is unicast and RA is not in associated station list,
233 * packet is forwarded to kernel to handle routing logic.
234 */
mwifiex_handle_uap_rx_forward(struct mwifiex_private * priv,struct sk_buff * skb)235 int mwifiex_handle_uap_rx_forward(struct mwifiex_private *priv,
236 struct sk_buff *skb)
237 {
238 struct mwifiex_adapter *adapter = priv->adapter;
239 struct uap_rxpd *uap_rx_pd;
240 struct rx_packet_hdr *rx_pkt_hdr;
241 u8 ra[ETH_ALEN];
242 struct sk_buff *skb_uap;
243
244 uap_rx_pd = (struct uap_rxpd *)(skb->data);
245 rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
246
247 /* don't do packet forwarding in disconnected state */
248 if (!priv->media_connected) {
249 mwifiex_dbg(adapter, ERROR,
250 "drop packet in disconnected state.\n");
251 dev_kfree_skb_any(skb);
252 return 0;
253 }
254
255 memcpy(ra, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN);
256
257 if (is_multicast_ether_addr(ra)) {
258 skb_uap = skb_copy(skb, GFP_ATOMIC);
259 mwifiex_uap_queue_bridged_pkt(priv, skb_uap);
260 } else {
261 if (mwifiex_get_sta_entry(priv, ra)) {
262 /* Requeue Intra-BSS packet */
263 mwifiex_uap_queue_bridged_pkt(priv, skb);
264 return 0;
265 }
266 }
267
268 /* Forward unicat/Inter-BSS packets to kernel. */
269 return mwifiex_process_rx_packet(priv, skb);
270 }
271
mwifiex_uap_recv_packet(struct mwifiex_private * priv,struct sk_buff * skb)272 int mwifiex_uap_recv_packet(struct mwifiex_private *priv,
273 struct sk_buff *skb)
274 {
275 struct mwifiex_adapter *adapter = priv->adapter;
276 struct mwifiex_sta_node *src_node;
277 struct ethhdr *p_ethhdr;
278 struct sk_buff *skb_uap;
279 struct mwifiex_txinfo *tx_info;
280
281 if (!skb)
282 return -1;
283
284 p_ethhdr = (void *)skb->data;
285 src_node = mwifiex_get_sta_entry(priv, p_ethhdr->h_source);
286 if (src_node) {
287 src_node->stats.last_rx = jiffies;
288 src_node->stats.rx_bytes += skb->len;
289 src_node->stats.rx_packets++;
290 }
291
292 skb->dev = priv->netdev;
293 skb->protocol = eth_type_trans(skb, priv->netdev);
294 skb->ip_summed = CHECKSUM_NONE;
295
296 /* This is required only in case of 11n and USB/PCIE as we alloc
297 * a buffer of 4K only if its 11N (to be able to receive 4K
298 * AMSDU packets). In case of SD we allocate buffers based
299 * on the size of packet and hence this is not needed.
300 *
301 * Modifying the truesize here as our allocation for each
302 * skb is 4K but we only receive 2K packets and this cause
303 * the kernel to start dropping packets in case where
304 * application has allocated buffer based on 2K size i.e.
305 * if there a 64K packet received (in IP fragments and
306 * application allocates 64K to receive this packet but
307 * this packet would almost double up because we allocate
308 * each 1.5K fragment in 4K and pass it up. As soon as the
309 * 64K limit hits kernel will start to drop rest of the
310 * fragments. Currently we fail the Filesndl-ht.scr script
311 * for UDP, hence this fix
312 */
313 if ((adapter->iface_type == MWIFIEX_USB ||
314 adapter->iface_type == MWIFIEX_PCIE) &&
315 (skb->truesize > MWIFIEX_RX_DATA_BUF_SIZE))
316 skb->truesize += (skb->len - MWIFIEX_RX_DATA_BUF_SIZE);
317
318 if (is_multicast_ether_addr(p_ethhdr->h_dest) ||
319 mwifiex_get_sta_entry(priv, p_ethhdr->h_dest)) {
320 if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN)
321 skb_uap =
322 skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN);
323 else
324 skb_uap = skb_copy(skb, GFP_ATOMIC);
325
326 if (likely(skb_uap)) {
327 tx_info = MWIFIEX_SKB_TXCB(skb_uap);
328 memset(tx_info, 0, sizeof(*tx_info));
329 tx_info->bss_num = priv->bss_num;
330 tx_info->bss_type = priv->bss_type;
331 tx_info->flags |= MWIFIEX_BUF_FLAG_BRIDGED_PKT;
332 __net_timestamp(skb_uap);
333 mwifiex_wmm_add_buf_txqueue(priv, skb_uap);
334 atomic_inc(&adapter->tx_pending);
335 atomic_inc(&adapter->pending_bridged_pkts);
336 if ((atomic_read(&adapter->pending_bridged_pkts) >=
337 MWIFIEX_BRIDGED_PKTS_THR_HIGH)) {
338 mwifiex_dbg(adapter, ERROR,
339 "Tx: Bridge packet limit reached. Drop packet!\n");
340 mwifiex_uap_cleanup_tx_queues(priv);
341 }
342
343 } else {
344 mwifiex_dbg(adapter, ERROR, "failed to allocate skb_uap");
345 }
346
347 mwifiex_queue_main_work(adapter);
348 /* Don't forward Intra-BSS unicast packet to upper layer*/
349 if (mwifiex_get_sta_entry(priv, p_ethhdr->h_dest))
350 return 0;
351 }
352
353 /* Forward multicast/broadcast packet to upper layer*/
354 if (in_interrupt())
355 netif_rx(skb);
356 else
357 netif_rx_ni(skb);
358
359 return 0;
360 }
361
362 /*
363 * This function processes the packet received on AP interface.
364 *
365 * The function looks into the RxPD and performs sanity tests on the
366 * received buffer to ensure its a valid packet before processing it
367 * further. If the packet is determined to be aggregated, it is
368 * de-aggregated accordingly. Then skb is passed to AP packet forwarding logic.
369 *
370 * The completion callback is called after processing is complete.
371 */
mwifiex_process_uap_rx_packet(struct mwifiex_private * priv,struct sk_buff * skb)372 int mwifiex_process_uap_rx_packet(struct mwifiex_private *priv,
373 struct sk_buff *skb)
374 {
375 struct mwifiex_adapter *adapter = priv->adapter;
376 int ret;
377 struct uap_rxpd *uap_rx_pd;
378 struct rx_packet_hdr *rx_pkt_hdr;
379 u16 rx_pkt_type;
380 u8 ta[ETH_ALEN], pkt_type;
381 unsigned long flags;
382 struct mwifiex_sta_node *node;
383
384 uap_rx_pd = (struct uap_rxpd *)(skb->data);
385 rx_pkt_type = le16_to_cpu(uap_rx_pd->rx_pkt_type);
386 rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
387
388 ether_addr_copy(ta, rx_pkt_hdr->eth803_hdr.h_source);
389
390 if ((le16_to_cpu(uap_rx_pd->rx_pkt_offset) +
391 le16_to_cpu(uap_rx_pd->rx_pkt_length)) > (u16) skb->len) {
392 mwifiex_dbg(adapter, ERROR,
393 "wrong rx packet: len=%d, offset=%d, length=%d\n",
394 skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset),
395 le16_to_cpu(uap_rx_pd->rx_pkt_length));
396 priv->stats.rx_dropped++;
397
398 node = mwifiex_get_sta_entry(priv, ta);
399 if (node)
400 node->stats.tx_failed++;
401
402 dev_kfree_skb_any(skb);
403 return 0;
404 }
405
406 if (rx_pkt_type == PKT_TYPE_MGMT) {
407 ret = mwifiex_process_mgmt_packet(priv, skb);
408 if (ret)
409 mwifiex_dbg(adapter, DATA, "Rx of mgmt packet failed");
410 dev_kfree_skb_any(skb);
411 return ret;
412 }
413
414
415 if (rx_pkt_type != PKT_TYPE_BAR && uap_rx_pd->priority < MAX_NUM_TID) {
416 spin_lock_irqsave(&priv->sta_list_spinlock, flags);
417 node = mwifiex_get_sta_entry(priv, ta);
418 if (node)
419 node->rx_seq[uap_rx_pd->priority] =
420 le16_to_cpu(uap_rx_pd->seq_num);
421 spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
422 }
423
424 if (!priv->ap_11n_enabled ||
425 (!mwifiex_11n_get_rx_reorder_tbl(priv, uap_rx_pd->priority, ta) &&
426 (le16_to_cpu(uap_rx_pd->rx_pkt_type) != PKT_TYPE_AMSDU))) {
427 ret = mwifiex_handle_uap_rx_forward(priv, skb);
428 return ret;
429 }
430
431 /* Reorder and send to kernel */
432 pkt_type = (u8)le16_to_cpu(uap_rx_pd->rx_pkt_type);
433 ret = mwifiex_11n_rx_reorder_pkt(priv, le16_to_cpu(uap_rx_pd->seq_num),
434 uap_rx_pd->priority, ta, pkt_type,
435 skb);
436
437 if (ret || (rx_pkt_type == PKT_TYPE_BAR))
438 dev_kfree_skb_any(skb);
439
440 if (ret)
441 priv->stats.rx_dropped++;
442
443 return ret;
444 }
445
446 /*
447 * This function fills the TxPD for AP tx packets.
448 *
449 * The Tx buffer received by this function should already have the
450 * header space allocated for TxPD.
451 *
452 * This function inserts the TxPD in between interface header and actual
453 * data and adjusts the buffer pointers accordingly.
454 *
455 * The following TxPD fields are set by this function, as required -
456 * - BSS number
457 * - Tx packet length and offset
458 * - Priority
459 * - Packet delay
460 * - Priority specific Tx control
461 * - Flags
462 */
mwifiex_process_uap_txpd(struct mwifiex_private * priv,struct sk_buff * skb)463 void *mwifiex_process_uap_txpd(struct mwifiex_private *priv,
464 struct sk_buff *skb)
465 {
466 struct mwifiex_adapter *adapter = priv->adapter;
467 struct uap_txpd *txpd;
468 struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
469 int pad;
470 u16 pkt_type, pkt_offset;
471 int hroom = (priv->adapter->iface_type == MWIFIEX_USB) ? 0 :
472 INTF_HEADER_LEN;
473
474 if (!skb->len) {
475 mwifiex_dbg(adapter, ERROR,
476 "Tx: bad packet length: %d\n", skb->len);
477 tx_info->status_code = -1;
478 return skb->data;
479 }
480
481 BUG_ON(skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN);
482
483 pkt_type = mwifiex_is_skb_mgmt_frame(skb) ? PKT_TYPE_MGMT : 0;
484
485 pad = ((void *)skb->data - (sizeof(*txpd) + hroom) - NULL) &
486 (MWIFIEX_DMA_ALIGN_SZ - 1);
487
488 skb_push(skb, sizeof(*txpd) + pad);
489
490 txpd = (struct uap_txpd *)skb->data;
491 memset(txpd, 0, sizeof(*txpd));
492 txpd->bss_num = priv->bss_num;
493 txpd->bss_type = priv->bss_type;
494 txpd->tx_pkt_length = cpu_to_le16((u16)(skb->len - (sizeof(*txpd) +
495 pad)));
496 txpd->priority = (u8)skb->priority;
497
498 txpd->pkt_delay_2ms = mwifiex_wmm_compute_drv_pkt_delay(priv, skb);
499
500 if (tx_info->flags & MWIFIEX_BUF_FLAG_EAPOL_TX_STATUS ||
501 tx_info->flags & MWIFIEX_BUF_FLAG_ACTION_TX_STATUS) {
502 txpd->tx_token_id = tx_info->ack_frame_id;
503 txpd->flags |= MWIFIEX_TXPD_FLAGS_REQ_TX_STATUS;
504 }
505
506 if (txpd->priority < ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl))
507 /*
508 * Set the priority specific tx_control field, setting of 0 will
509 * cause the default value to be used later in this function.
510 */
511 txpd->tx_control =
512 cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[txpd->priority]);
513
514 /* Offset of actual data */
515 pkt_offset = sizeof(*txpd) + pad;
516 if (pkt_type == PKT_TYPE_MGMT) {
517 /* Set the packet type and add header for management frame */
518 txpd->tx_pkt_type = cpu_to_le16(pkt_type);
519 pkt_offset += MWIFIEX_MGMT_FRAME_HEADER_SIZE;
520 }
521
522 txpd->tx_pkt_offset = cpu_to_le16(pkt_offset);
523
524 /* make space for INTF_HEADER_LEN */
525 skb_push(skb, hroom);
526
527 if (!txpd->tx_control)
528 /* TxCtrl set by user or default */
529 txpd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
530
531 return skb->data;
532 }
533