1 /*
2 * Marvell Wireless LAN device driver: generic TX/RX data handling
3 *
4 * Copyright (C) 2011-2014, 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 "util.h"
23 #include "fw.h"
24 #include "main.h"
25 #include "wmm.h"
26
27 /*
28 * This function processes the received buffer.
29 *
30 * Main responsibility of this function is to parse the RxPD to
31 * identify the correct interface this packet is headed for and
32 * forwarding it to the associated handling function, where the
33 * packet will be further processed and sent to kernel/upper layer
34 * if required.
35 */
mwifiex_handle_rx_packet(struct mwifiex_adapter * adapter,struct sk_buff * skb)36 int mwifiex_handle_rx_packet(struct mwifiex_adapter *adapter,
37 struct sk_buff *skb)
38 {
39 struct mwifiex_private *priv =
40 mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);
41 struct rxpd *local_rx_pd;
42 struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
43 int ret;
44
45 local_rx_pd = (struct rxpd *) (skb->data);
46 /* Get the BSS number from rxpd, get corresponding priv */
47 priv = mwifiex_get_priv_by_id(adapter, local_rx_pd->bss_num &
48 BSS_NUM_MASK, local_rx_pd->bss_type);
49 if (!priv)
50 priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);
51
52 if (!priv) {
53 mwifiex_dbg(adapter, ERROR,
54 "data: priv not found. Drop RX packet\n");
55 dev_kfree_skb_any(skb);
56 return -1;
57 }
58
59 mwifiex_dbg_dump(adapter, DAT_D, "rx pkt:", skb->data,
60 min_t(size_t, skb->len, DEBUG_DUMP_DATA_MAX_LEN));
61
62 memset(rx_info, 0, sizeof(*rx_info));
63 rx_info->bss_num = priv->bss_num;
64 rx_info->bss_type = priv->bss_type;
65
66 if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP)
67 ret = mwifiex_process_uap_rx_packet(priv, skb);
68 else
69 ret = mwifiex_process_sta_rx_packet(priv, skb);
70
71 return ret;
72 }
73 EXPORT_SYMBOL_GPL(mwifiex_handle_rx_packet);
74
75 /*
76 * This function sends a packet to device.
77 *
78 * It processes the packet to add the TxPD, checks condition and
79 * sends the processed packet to firmware for transmission.
80 *
81 * On successful completion, the function calls the completion callback
82 * and logs the time.
83 */
mwifiex_process_tx(struct mwifiex_private * priv,struct sk_buff * skb,struct mwifiex_tx_param * tx_param)84 int mwifiex_process_tx(struct mwifiex_private *priv, struct sk_buff *skb,
85 struct mwifiex_tx_param *tx_param)
86 {
87 int hroom, ret = -1;
88 struct mwifiex_adapter *adapter = priv->adapter;
89 u8 *head_ptr;
90 struct txpd *local_tx_pd = NULL;
91 struct mwifiex_sta_node *dest_node;
92 struct ethhdr *hdr = (void *)skb->data;
93
94 hroom = adapter->intf_hdr_len;
95
96 if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP) {
97 dest_node = mwifiex_get_sta_entry(priv, hdr->h_dest);
98 if (dest_node) {
99 dest_node->stats.tx_bytes += skb->len;
100 dest_node->stats.tx_packets++;
101 }
102
103 head_ptr = mwifiex_process_uap_txpd(priv, skb);
104 } else {
105 head_ptr = mwifiex_process_sta_txpd(priv, skb);
106 }
107
108 if ((adapter->data_sent || adapter->tx_lock_flag) && head_ptr) {
109 skb_queue_tail(&adapter->tx_data_q, skb);
110 atomic_inc(&adapter->tx_queued);
111 return 0;
112 }
113
114 if (head_ptr) {
115 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA)
116 local_tx_pd = (struct txpd *)(head_ptr + hroom);
117 if (adapter->iface_type == MWIFIEX_USB) {
118 ret = adapter->if_ops.host_to_card(adapter,
119 priv->usb_port,
120 skb, tx_param);
121 } else {
122 ret = adapter->if_ops.host_to_card(adapter,
123 MWIFIEX_TYPE_DATA,
124 skb, tx_param);
125 }
126 }
127 mwifiex_dbg_dump(adapter, DAT_D, "tx pkt:", skb->data,
128 min_t(size_t, skb->len, DEBUG_DUMP_DATA_MAX_LEN));
129
130 switch (ret) {
131 case -ENOSR:
132 mwifiex_dbg(adapter, DATA, "data: -ENOSR is returned\n");
133 break;
134 case -EBUSY:
135 if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) &&
136 (adapter->pps_uapsd_mode) && (adapter->tx_lock_flag)) {
137 priv->adapter->tx_lock_flag = false;
138 if (local_tx_pd)
139 local_tx_pd->flags = 0;
140 }
141 mwifiex_dbg(adapter, ERROR, "data: -EBUSY is returned\n");
142 break;
143 case -1:
144 mwifiex_dbg(adapter, ERROR,
145 "mwifiex_write_data_async failed: 0x%X\n",
146 ret);
147 adapter->dbg.num_tx_host_to_card_failure++;
148 mwifiex_write_data_complete(adapter, skb, 0, ret);
149 break;
150 case -EINPROGRESS:
151 break;
152 case 0:
153 mwifiex_write_data_complete(adapter, skb, 0, ret);
154 break;
155 default:
156 break;
157 }
158
159 return ret;
160 }
161
mwifiex_host_to_card(struct mwifiex_adapter * adapter,struct sk_buff * skb,struct mwifiex_tx_param * tx_param)162 static int mwifiex_host_to_card(struct mwifiex_adapter *adapter,
163 struct sk_buff *skb,
164 struct mwifiex_tx_param *tx_param)
165 {
166 struct txpd *local_tx_pd = NULL;
167 u8 *head_ptr = skb->data;
168 int ret = 0;
169 struct mwifiex_private *priv;
170 struct mwifiex_txinfo *tx_info;
171
172 tx_info = MWIFIEX_SKB_TXCB(skb);
173 priv = mwifiex_get_priv_by_id(adapter, tx_info->bss_num,
174 tx_info->bss_type);
175 if (!priv) {
176 mwifiex_dbg(adapter, ERROR,
177 "data: priv not found. Drop TX packet\n");
178 adapter->dbg.num_tx_host_to_card_failure++;
179 mwifiex_write_data_complete(adapter, skb, 0, 0);
180 return ret;
181 }
182 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA)
183 local_tx_pd = (struct txpd *)(head_ptr + adapter->intf_hdr_len);
184
185 if (adapter->iface_type == MWIFIEX_USB) {
186 ret = adapter->if_ops.host_to_card(adapter,
187 priv->usb_port,
188 skb, tx_param);
189 } else {
190 ret = adapter->if_ops.host_to_card(adapter,
191 MWIFIEX_TYPE_DATA,
192 skb, tx_param);
193 }
194 switch (ret) {
195 case -ENOSR:
196 mwifiex_dbg(adapter, ERROR, "data: -ENOSR is returned\n");
197 break;
198 case -EBUSY:
199 if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) &&
200 (adapter->pps_uapsd_mode) &&
201 (adapter->tx_lock_flag)) {
202 priv->adapter->tx_lock_flag = false;
203 if (local_tx_pd)
204 local_tx_pd->flags = 0;
205 }
206 skb_queue_head(&adapter->tx_data_q, skb);
207 if (tx_info->flags & MWIFIEX_BUF_FLAG_AGGR_PKT)
208 atomic_add(tx_info->aggr_num, &adapter->tx_queued);
209 else
210 atomic_inc(&adapter->tx_queued);
211 mwifiex_dbg(adapter, ERROR, "data: -EBUSY is returned\n");
212 break;
213 case -1:
214 mwifiex_dbg(adapter, ERROR,
215 "mwifiex_write_data_async failed: 0x%X\n", ret);
216 adapter->dbg.num_tx_host_to_card_failure++;
217 mwifiex_write_data_complete(adapter, skb, 0, ret);
218 break;
219 case -EINPROGRESS:
220 break;
221 case 0:
222 mwifiex_write_data_complete(adapter, skb, 0, ret);
223 break;
224 default:
225 break;
226 }
227 return ret;
228 }
229
230 static int
mwifiex_dequeue_tx_queue(struct mwifiex_adapter * adapter)231 mwifiex_dequeue_tx_queue(struct mwifiex_adapter *adapter)
232 {
233 struct sk_buff *skb, *skb_next;
234 struct mwifiex_txinfo *tx_info;
235 struct mwifiex_tx_param tx_param;
236
237 skb = skb_dequeue(&adapter->tx_data_q);
238 if (!skb)
239 return -1;
240
241 tx_info = MWIFIEX_SKB_TXCB(skb);
242 if (tx_info->flags & MWIFIEX_BUF_FLAG_AGGR_PKT)
243 atomic_sub(tx_info->aggr_num, &adapter->tx_queued);
244 else
245 atomic_dec(&adapter->tx_queued);
246
247 if (!skb_queue_empty(&adapter->tx_data_q))
248 skb_next = skb_peek(&adapter->tx_data_q);
249 else
250 skb_next = NULL;
251 tx_param.next_pkt_len = ((skb_next) ? skb_next->len : 0);
252 if (!tx_param.next_pkt_len) {
253 if (!mwifiex_wmm_lists_empty(adapter))
254 tx_param.next_pkt_len = 1;
255 }
256 return mwifiex_host_to_card(adapter, skb, &tx_param);
257 }
258
259 void
mwifiex_process_tx_queue(struct mwifiex_adapter * adapter)260 mwifiex_process_tx_queue(struct mwifiex_adapter *adapter)
261 {
262 do {
263 if (adapter->data_sent || adapter->tx_lock_flag)
264 break;
265 if (mwifiex_dequeue_tx_queue(adapter))
266 break;
267 } while (!skb_queue_empty(&adapter->tx_data_q));
268 }
269
270 /*
271 * Packet send completion callback handler.
272 *
273 * It either frees the buffer directly or forwards it to another
274 * completion callback which checks conditions, updates statistics,
275 * wakes up stalled traffic queue if required, and then frees the buffer.
276 */
mwifiex_write_data_complete(struct mwifiex_adapter * adapter,struct sk_buff * skb,int aggr,int status)277 int mwifiex_write_data_complete(struct mwifiex_adapter *adapter,
278 struct sk_buff *skb, int aggr, int status)
279 {
280 struct mwifiex_private *priv;
281 struct mwifiex_txinfo *tx_info;
282 struct netdev_queue *txq;
283 int index;
284
285 if (!skb)
286 return 0;
287
288 tx_info = MWIFIEX_SKB_TXCB(skb);
289 priv = mwifiex_get_priv_by_id(adapter, tx_info->bss_num,
290 tx_info->bss_type);
291 if (!priv)
292 goto done;
293
294 mwifiex_set_trans_start(priv->netdev);
295
296 if (tx_info->flags & MWIFIEX_BUF_FLAG_BRIDGED_PKT)
297 atomic_dec_return(&adapter->pending_bridged_pkts);
298
299 if (tx_info->flags & MWIFIEX_BUF_FLAG_AGGR_PKT)
300 goto done;
301
302 if (!status) {
303 priv->stats.tx_packets++;
304 priv->stats.tx_bytes += tx_info->pkt_len;
305 if (priv->tx_timeout_cnt)
306 priv->tx_timeout_cnt = 0;
307 } else {
308 priv->stats.tx_errors++;
309 }
310
311 if (aggr)
312 /* For skb_aggr, do not wake up tx queue */
313 goto done;
314
315 atomic_dec(&adapter->tx_pending);
316
317 index = mwifiex_1d_to_wmm_queue[skb->priority];
318 if (atomic_dec_return(&priv->wmm_tx_pending[index]) < LOW_TX_PENDING) {
319 txq = netdev_get_tx_queue(priv->netdev, index);
320 if (netif_tx_queue_stopped(txq)) {
321 netif_tx_wake_queue(txq);
322 mwifiex_dbg(adapter, DATA, "wake queue: %d\n", index);
323 }
324 }
325 done:
326 dev_kfree_skb_any(skb);
327
328 return 0;
329 }
330 EXPORT_SYMBOL_GPL(mwifiex_write_data_complete);
331
mwifiex_parse_tx_status_event(struct mwifiex_private * priv,void * event_body)332 void mwifiex_parse_tx_status_event(struct mwifiex_private *priv,
333 void *event_body)
334 {
335 struct tx_status_event *tx_status = (void *)priv->adapter->event_body;
336 struct sk_buff *ack_skb;
337 unsigned long flags;
338 struct mwifiex_txinfo *tx_info;
339
340 if (!tx_status->tx_token_id)
341 return;
342
343 spin_lock_irqsave(&priv->ack_status_lock, flags);
344 ack_skb = idr_remove(&priv->ack_status_frames, tx_status->tx_token_id);
345 spin_unlock_irqrestore(&priv->ack_status_lock, flags);
346
347 if (ack_skb) {
348 tx_info = MWIFIEX_SKB_TXCB(ack_skb);
349
350 if (tx_info->flags & MWIFIEX_BUF_FLAG_EAPOL_TX_STATUS) {
351 /* consumes ack_skb */
352 skb_complete_wifi_ack(ack_skb, !tx_status->status);
353 } else {
354 /* Remove broadcast address which was added by driver */
355 memmove(ack_skb->data +
356 sizeof(struct ieee80211_hdr_3addr) +
357 MWIFIEX_MGMT_FRAME_HEADER_SIZE + sizeof(u16),
358 ack_skb->data +
359 sizeof(struct ieee80211_hdr_3addr) +
360 MWIFIEX_MGMT_FRAME_HEADER_SIZE + sizeof(u16) +
361 ETH_ALEN, ack_skb->len -
362 (sizeof(struct ieee80211_hdr_3addr) +
363 MWIFIEX_MGMT_FRAME_HEADER_SIZE + sizeof(u16) +
364 ETH_ALEN));
365 ack_skb->len = ack_skb->len - ETH_ALEN;
366 /* Remove driver's proprietary header including 2 bytes
367 * of packet length and pass actual management frame buffer
368 * to cfg80211.
369 */
370 cfg80211_mgmt_tx_status(&priv->wdev, tx_info->cookie,
371 ack_skb->data +
372 MWIFIEX_MGMT_FRAME_HEADER_SIZE +
373 sizeof(u16), ack_skb->len -
374 (MWIFIEX_MGMT_FRAME_HEADER_SIZE
375 + sizeof(u16)),
376 !tx_status->status, GFP_ATOMIC);
377 dev_kfree_skb_any(ack_skb);
378 }
379 }
380 }
381
