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