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
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 mwifiex_wmm_add_buf_txqueue(priv, skb);
212 atomic_inc(&adapter->tx_pending);
213 atomic_inc(&adapter->pending_bridged_pkts);
214
215 return;
216 }
217
218 /*
219 * This function contains logic for AP packet forwarding.
220 *
221 * If a packet is multicast/broadcast, it is sent to kernel/upper layer
222 * as well as queued back to AP TX queue so that it can be sent to other
223 * associated stations.
224 * If a packet is unicast and RA is present in associated station list,
225 * it is again requeued into AP TX queue.
226 * If a packet is unicast and RA is not in associated station list,
227 * packet is forwarded to kernel to handle routing logic.
228 */
mwifiex_handle_uap_rx_forward(struct mwifiex_private * priv,struct sk_buff * skb)229 int mwifiex_handle_uap_rx_forward(struct mwifiex_private *priv,
230 struct sk_buff *skb)
231 {
232 struct mwifiex_adapter *adapter = priv->adapter;
233 struct uap_rxpd *uap_rx_pd;
234 struct rx_packet_hdr *rx_pkt_hdr;
235 u8 ra[ETH_ALEN];
236 struct sk_buff *skb_uap;
237
238 uap_rx_pd = (struct uap_rxpd *)(skb->data);
239 rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
240
241 /* don't do packet forwarding in disconnected state */
242 if (!priv->media_connected) {
243 mwifiex_dbg(adapter, ERROR,
244 "drop packet in disconnected state.\n");
245 dev_kfree_skb_any(skb);
246 return 0;
247 }
248
249 memcpy(ra, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN);
250
251 if (is_multicast_ether_addr(ra)) {
252 skb_uap = skb_copy(skb, GFP_ATOMIC);
253 mwifiex_uap_queue_bridged_pkt(priv, skb_uap);
254 } else {
255 if (mwifiex_get_sta_entry(priv, ra)) {
256 /* Requeue Intra-BSS packet */
257 mwifiex_uap_queue_bridged_pkt(priv, skb);
258 return 0;
259 }
260 }
261
262 /* Forward unicat/Inter-BSS packets to kernel. */
263 return mwifiex_process_rx_packet(priv, skb);
264 }
265
266 /*
267 * This function processes the packet received on AP interface.
268 *
269 * The function looks into the RxPD and performs sanity tests on the
270 * received buffer to ensure its a valid packet before processing it
271 * further. If the packet is determined to be aggregated, it is
272 * de-aggregated accordingly. Then skb is passed to AP packet forwarding logic.
273 *
274 * The completion callback is called after processing is complete.
275 */
mwifiex_process_uap_rx_packet(struct mwifiex_private * priv,struct sk_buff * skb)276 int mwifiex_process_uap_rx_packet(struct mwifiex_private *priv,
277 struct sk_buff *skb)
278 {
279 struct mwifiex_adapter *adapter = priv->adapter;
280 int ret;
281 struct uap_rxpd *uap_rx_pd;
282 struct rx_packet_hdr *rx_pkt_hdr;
283 u16 rx_pkt_type;
284 u8 ta[ETH_ALEN], pkt_type;
285 unsigned long flags;
286 struct mwifiex_sta_node *node;
287
288 uap_rx_pd = (struct uap_rxpd *)(skb->data);
289 rx_pkt_type = le16_to_cpu(uap_rx_pd->rx_pkt_type);
290 rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
291
292 ether_addr_copy(ta, rx_pkt_hdr->eth803_hdr.h_source);
293
294 if ((le16_to_cpu(uap_rx_pd->rx_pkt_offset) +
295 le16_to_cpu(uap_rx_pd->rx_pkt_length)) > (u16) skb->len) {
296 mwifiex_dbg(adapter, ERROR,
297 "wrong rx packet: len=%d, offset=%d, length=%d\n",
298 skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset),
299 le16_to_cpu(uap_rx_pd->rx_pkt_length));
300 priv->stats.rx_dropped++;
301
302 node = mwifiex_get_sta_entry(priv, ta);
303 if (node)
304 node->stats.tx_failed++;
305
306 dev_kfree_skb_any(skb);
307 return 0;
308 }
309
310 if (rx_pkt_type == PKT_TYPE_MGMT) {
311 ret = mwifiex_process_mgmt_packet(priv, skb);
312 if (ret)
313 mwifiex_dbg(adapter, ERROR,
314 "Rx of mgmt packet failed");
315 dev_kfree_skb_any(skb);
316 return ret;
317 }
318
319
320 if (rx_pkt_type != PKT_TYPE_BAR && uap_rx_pd->priority < MAX_NUM_TID) {
321 spin_lock_irqsave(&priv->sta_list_spinlock, flags);
322 node = mwifiex_get_sta_entry(priv, ta);
323 if (node)
324 node->rx_seq[uap_rx_pd->priority] =
325 le16_to_cpu(uap_rx_pd->seq_num);
326 spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
327 }
328
329 if (!priv->ap_11n_enabled ||
330 (!mwifiex_11n_get_rx_reorder_tbl(priv, uap_rx_pd->priority, ta) &&
331 (le16_to_cpu(uap_rx_pd->rx_pkt_type) != PKT_TYPE_AMSDU))) {
332 ret = mwifiex_handle_uap_rx_forward(priv, skb);
333 return ret;
334 }
335
336 /* Reorder and send to kernel */
337 pkt_type = (u8)le16_to_cpu(uap_rx_pd->rx_pkt_type);
338 ret = mwifiex_11n_rx_reorder_pkt(priv, le16_to_cpu(uap_rx_pd->seq_num),
339 uap_rx_pd->priority, ta, pkt_type,
340 skb);
341
342 if (ret || (rx_pkt_type == PKT_TYPE_BAR))
343 dev_kfree_skb_any(skb);
344
345 if (ret)
346 priv->stats.rx_dropped++;
347
348 return ret;
349 }
350
351 /*
352 * This function fills the TxPD for AP tx packets.
353 *
354 * The Tx buffer received by this function should already have the
355 * header space allocated for TxPD.
356 *
357 * This function inserts the TxPD in between interface header and actual
358 * data and adjusts the buffer pointers accordingly.
359 *
360 * The following TxPD fields are set by this function, as required -
361 * - BSS number
362 * - Tx packet length and offset
363 * - Priority
364 * - Packet delay
365 * - Priority specific Tx control
366 * - Flags
367 */
mwifiex_process_uap_txpd(struct mwifiex_private * priv,struct sk_buff * skb)368 void *mwifiex_process_uap_txpd(struct mwifiex_private *priv,
369 struct sk_buff *skb)
370 {
371 struct mwifiex_adapter *adapter = priv->adapter;
372 struct uap_txpd *txpd;
373 struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
374 int pad;
375 u16 pkt_type, pkt_offset;
376 int hroom = (priv->adapter->iface_type == MWIFIEX_USB) ? 0 :
377 INTF_HEADER_LEN;
378
379 if (!skb->len) {
380 mwifiex_dbg(adapter, ERROR,
381 "Tx: bad packet length: %d\n", skb->len);
382 tx_info->status_code = -1;
383 return skb->data;
384 }
385
386 BUG_ON(skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN);
387
388 pkt_type = mwifiex_is_skb_mgmt_frame(skb) ? PKT_TYPE_MGMT : 0;
389
390 pad = ((void *)skb->data - (sizeof(*txpd) + hroom) - NULL) &
391 (MWIFIEX_DMA_ALIGN_SZ - 1);
392
393 skb_push(skb, sizeof(*txpd) + pad);
394
395 txpd = (struct uap_txpd *)skb->data;
396 memset(txpd, 0, sizeof(*txpd));
397 txpd->bss_num = priv->bss_num;
398 txpd->bss_type = priv->bss_type;
399 txpd->tx_pkt_length = cpu_to_le16((u16)(skb->len - (sizeof(*txpd) +
400 pad)));
401 txpd->priority = (u8)skb->priority;
402
403 txpd->pkt_delay_2ms = mwifiex_wmm_compute_drv_pkt_delay(priv, skb);
404
405 if (tx_info->flags & MWIFIEX_BUF_FLAG_EAPOL_TX_STATUS ||
406 tx_info->flags & MWIFIEX_BUF_FLAG_ACTION_TX_STATUS) {
407 txpd->tx_token_id = tx_info->ack_frame_id;
408 txpd->flags |= MWIFIEX_TXPD_FLAGS_REQ_TX_STATUS;
409 }
410
411 if (txpd->priority < ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl))
412 /*
413 * Set the priority specific tx_control field, setting of 0 will
414 * cause the default value to be used later in this function.
415 */
416 txpd->tx_control =
417 cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[txpd->priority]);
418
419 /* Offset of actual data */
420 pkt_offset = sizeof(*txpd) + pad;
421 if (pkt_type == PKT_TYPE_MGMT) {
422 /* Set the packet type and add header for management frame */
423 txpd->tx_pkt_type = cpu_to_le16(pkt_type);
424 pkt_offset += MWIFIEX_MGMT_FRAME_HEADER_SIZE;
425 }
426
427 txpd->tx_pkt_offset = cpu_to_le16(pkt_offset);
428
429 /* make space for INTF_HEADER_LEN */
430 skb_push(skb, hroom);
431
432 if (!txpd->tx_control)
433 /* TxCtrl set by user or default */
434 txpd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
435
436 return skb->data;
437 }
438