1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * This file contains the handling of command
4 * responses as well as events generated by firmware.
5 */
6
7 #include <linux/hardirq.h>
8 #include <linux/slab.h>
9 #include <linux/delay.h>
10 #include <linux/sched.h>
11 #include <linux/unaligned.h>
12 #include <net/cfg80211.h>
13
14 #include "cfg.h"
15 #include "cmd.h"
16
17 /**
18 * lbs_mac_event_disconnected - handles disconnect event. It
19 * reports disconnect to upper layer, clean tx/rx packets,
20 * reset link state etc.
21 *
22 * @priv: A pointer to struct lbs_private structure
23 * @locally_generated: indicates disconnect was requested locally
24 * (usually by userspace)
25 *
26 * returns: n/a
27 */
lbs_mac_event_disconnected(struct lbs_private * priv,bool locally_generated)28 void lbs_mac_event_disconnected(struct lbs_private *priv,
29 bool locally_generated)
30 {
31 unsigned long flags;
32
33 if (priv->connect_status != LBS_CONNECTED)
34 return;
35
36 /*
37 * Cisco AP sends EAP failure and de-auth in less than 0.5 ms.
38 * It causes problem in the Supplicant
39 */
40 msleep_interruptible(1000);
41
42 if (priv->wdev->iftype == NL80211_IFTYPE_STATION)
43 lbs_send_disconnect_notification(priv, locally_generated);
44
45 /* report disconnect to upper layer */
46 netif_stop_queue(priv->dev);
47 netif_carrier_off(priv->dev);
48
49 /* Free Tx and Rx packets */
50 spin_lock_irqsave(&priv->driver_lock, flags);
51 dev_kfree_skb_irq(priv->currenttxskb);
52 priv->currenttxskb = NULL;
53 priv->tx_pending_len = 0;
54 spin_unlock_irqrestore(&priv->driver_lock, flags);
55
56 priv->connect_status = LBS_DISCONNECTED;
57
58 if (priv->psstate != PS_STATE_FULL_POWER) {
59 /* make firmware to exit PS mode */
60 lbs_deb_cmd("disconnected, so exit PS mode\n");
61 lbs_set_ps_mode(priv, PS_MODE_ACTION_EXIT_PS, false);
62 }
63 }
64
lbs_process_command_response(struct lbs_private * priv,u8 * data,u32 len)65 int lbs_process_command_response(struct lbs_private *priv, u8 *data, u32 len)
66 {
67 uint16_t respcmd, curcmd;
68 struct cmd_header *resp;
69 int ret = 0;
70 unsigned long flags;
71 uint16_t result;
72
73 mutex_lock(&priv->lock);
74 spin_lock_irqsave(&priv->driver_lock, flags);
75
76 if (!priv->cur_cmd) {
77 lbs_deb_host("CMD_RESP: cur_cmd is NULL\n");
78 ret = -1;
79 spin_unlock_irqrestore(&priv->driver_lock, flags);
80 goto done;
81 }
82
83 resp = (void *)data;
84 curcmd = le16_to_cpu(priv->cur_cmd->cmdbuf->command);
85 respcmd = le16_to_cpu(resp->command);
86 result = le16_to_cpu(resp->result);
87
88 lbs_deb_cmd("CMD_RESP: response 0x%04x, seq %d, size %d\n",
89 respcmd, le16_to_cpu(resp->seqnum), len);
90 lbs_deb_hex(LBS_DEB_CMD, "CMD_RESP", (void *) resp, len);
91
92 if (resp->seqnum != priv->cur_cmd->cmdbuf->seqnum) {
93 netdev_info(priv->dev,
94 "Received CMD_RESP with invalid sequence %d (expected %d)\n",
95 le16_to_cpu(resp->seqnum),
96 le16_to_cpu(priv->cur_cmd->cmdbuf->seqnum));
97 spin_unlock_irqrestore(&priv->driver_lock, flags);
98 ret = -1;
99 goto done;
100 }
101 if (respcmd != CMD_RET(curcmd) &&
102 respcmd != CMD_RET_802_11_ASSOCIATE && curcmd != CMD_802_11_ASSOCIATE) {
103 netdev_info(priv->dev, "Invalid CMD_RESP %x to command %x!\n",
104 respcmd, curcmd);
105 spin_unlock_irqrestore(&priv->driver_lock, flags);
106 ret = -1;
107 goto done;
108 }
109
110 if (resp->result == cpu_to_le16(0x0004)) {
111 /* 0x0004 means -EAGAIN. Drop the response, let it time out
112 and be resubmitted */
113 netdev_info(priv->dev,
114 "Firmware returns DEFER to command %x. Will let it time out...\n",
115 le16_to_cpu(resp->command));
116 spin_unlock_irqrestore(&priv->driver_lock, flags);
117 ret = -1;
118 goto done;
119 }
120
121 /* Now we got response from FW, cancel the command timer */
122 del_timer(&priv->command_timer);
123 priv->cmd_timed_out = 0;
124
125 if (respcmd == CMD_RET(CMD_802_11_PS_MODE)) {
126 /* struct cmd_ds_802_11_ps_mode also contains
127 * the header
128 */
129 struct cmd_ds_802_11_ps_mode *psmode = (void *)resp;
130 u16 action = le16_to_cpu(psmode->action);
131
132 lbs_deb_host(
133 "CMD_RESP: PS_MODE cmd reply result 0x%x, action 0x%x\n",
134 result, action);
135
136 if (result) {
137 lbs_deb_host("CMD_RESP: PS command failed with 0x%x\n",
138 result);
139 /*
140 * We should not re-try enter-ps command in
141 * ad-hoc mode. It takes place in
142 * lbs_execute_next_command().
143 */
144 if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR &&
145 action == PS_MODE_ACTION_ENTER_PS)
146 priv->psmode = LBS802_11POWERMODECAM;
147 } else if (action == PS_MODE_ACTION_ENTER_PS) {
148 priv->needtowakeup = 0;
149 priv->psstate = PS_STATE_AWAKE;
150
151 lbs_deb_host("CMD_RESP: ENTER_PS command response\n");
152 if (priv->connect_status != LBS_CONNECTED) {
153 /*
154 * When Deauth Event received before Enter_PS command
155 * response, We need to wake up the firmware.
156 */
157 lbs_deb_host(
158 "disconnected, invoking lbs_ps_wakeup\n");
159
160 spin_unlock_irqrestore(&priv->driver_lock, flags);
161 mutex_unlock(&priv->lock);
162 lbs_set_ps_mode(priv, PS_MODE_ACTION_EXIT_PS,
163 false);
164 mutex_lock(&priv->lock);
165 spin_lock_irqsave(&priv->driver_lock, flags);
166 }
167 } else if (action == PS_MODE_ACTION_EXIT_PS) {
168 priv->needtowakeup = 0;
169 priv->psstate = PS_STATE_FULL_POWER;
170 lbs_deb_host("CMD_RESP: EXIT_PS command response\n");
171 } else {
172 lbs_deb_host("CMD_RESP: PS action 0x%X\n", action);
173 }
174
175 __lbs_complete_command(priv, priv->cur_cmd, result);
176 spin_unlock_irqrestore(&priv->driver_lock, flags);
177
178 ret = 0;
179 goto done;
180 }
181
182 /* If the command is not successful, cleanup and return failure */
183 if ((result != 0 || !(respcmd & 0x8000))) {
184 lbs_deb_host("CMD_RESP: error 0x%04x in command reply 0x%04x\n",
185 result, respcmd);
186 /*
187 * Handling errors here
188 */
189 switch (respcmd) {
190 case CMD_RET(CMD_GET_HW_SPEC):
191 case CMD_RET(CMD_802_11_RESET):
192 lbs_deb_host("CMD_RESP: reset failed\n");
193 break;
194
195 }
196 __lbs_complete_command(priv, priv->cur_cmd, result);
197 spin_unlock_irqrestore(&priv->driver_lock, flags);
198
199 ret = -1;
200 goto done;
201 }
202
203 spin_unlock_irqrestore(&priv->driver_lock, flags);
204
205 if (priv->cur_cmd && priv->cur_cmd->callback) {
206 ret = priv->cur_cmd->callback(priv, priv->cur_cmd->callback_arg,
207 resp);
208 }
209
210 spin_lock_irqsave(&priv->driver_lock, flags);
211
212 if (priv->cur_cmd) {
213 /* Clean up and Put current command back to cmdfreeq */
214 __lbs_complete_command(priv, priv->cur_cmd, result);
215 }
216 spin_unlock_irqrestore(&priv->driver_lock, flags);
217
218 done:
219 mutex_unlock(&priv->lock);
220 return ret;
221 }
222
lbs_process_event(struct lbs_private * priv,u32 event)223 void lbs_process_event(struct lbs_private *priv, u32 event)
224 {
225 struct cmd_header cmd;
226
227 switch (event) {
228 case MACREG_INT_CODE_LINK_SENSED:
229 lbs_deb_cmd("EVENT: link sensed\n");
230 break;
231
232 case MACREG_INT_CODE_DEAUTHENTICATED:
233 lbs_deb_cmd("EVENT: deauthenticated\n");
234 lbs_mac_event_disconnected(priv, false);
235 break;
236
237 case MACREG_INT_CODE_DISASSOCIATED:
238 lbs_deb_cmd("EVENT: disassociated\n");
239 lbs_mac_event_disconnected(priv, false);
240 break;
241
242 case MACREG_INT_CODE_LINK_LOST_NO_SCAN:
243 lbs_deb_cmd("EVENT: link lost\n");
244 lbs_mac_event_disconnected(priv, true);
245 break;
246
247 case MACREG_INT_CODE_PS_SLEEP:
248 lbs_deb_cmd("EVENT: ps sleep\n");
249
250 /* handle unexpected PS SLEEP event */
251 if (priv->psstate == PS_STATE_FULL_POWER) {
252 lbs_deb_cmd(
253 "EVENT: in FULL POWER mode, ignoring PS_SLEEP\n");
254 break;
255 }
256 if (!list_empty(&priv->cmdpendingq)) {
257 lbs_deb_cmd("EVENT: commands in queue, do not sleep\n");
258 break;
259 }
260 priv->psstate = PS_STATE_PRE_SLEEP;
261
262 lbs_ps_confirm_sleep(priv);
263
264 break;
265
266 case MACREG_INT_CODE_HOST_AWAKE:
267 lbs_deb_cmd("EVENT: host awake\n");
268 if (priv->reset_deep_sleep_wakeup)
269 priv->reset_deep_sleep_wakeup(priv);
270 priv->is_deep_sleep = 0;
271 lbs_cmd_async(priv, CMD_802_11_WAKEUP_CONFIRM, &cmd,
272 sizeof(cmd));
273 priv->is_host_sleep_activated = 0;
274 wake_up_interruptible(&priv->host_sleep_q);
275 break;
276
277 case MACREG_INT_CODE_DEEP_SLEEP_AWAKE:
278 if (priv->reset_deep_sleep_wakeup)
279 priv->reset_deep_sleep_wakeup(priv);
280 lbs_deb_cmd("EVENT: ds awake\n");
281 priv->is_deep_sleep = 0;
282 priv->wakeup_dev_required = 0;
283 wake_up_interruptible(&priv->ds_awake_q);
284 break;
285
286 case MACREG_INT_CODE_PS_AWAKE:
287 lbs_deb_cmd("EVENT: ps awake\n");
288 /* handle unexpected PS AWAKE event */
289 if (priv->psstate == PS_STATE_FULL_POWER) {
290 lbs_deb_cmd(
291 "EVENT: In FULL POWER mode - ignore PS AWAKE\n");
292 break;
293 }
294
295 priv->psstate = PS_STATE_AWAKE;
296
297 if (priv->needtowakeup) {
298 /*
299 * wait for the command processing to finish
300 * before resuming sending
301 * priv->needtowakeup will be set to FALSE
302 * in lbs_ps_wakeup()
303 */
304 lbs_deb_cmd("waking up ...\n");
305 lbs_set_ps_mode(priv, PS_MODE_ACTION_EXIT_PS, false);
306 }
307 break;
308
309 case MACREG_INT_CODE_MIC_ERR_UNICAST:
310 lbs_deb_cmd("EVENT: UNICAST MIC ERROR\n");
311 lbs_send_mic_failureevent(priv, event);
312 break;
313
314 case MACREG_INT_CODE_MIC_ERR_MULTICAST:
315 lbs_deb_cmd("EVENT: MULTICAST MIC ERROR\n");
316 lbs_send_mic_failureevent(priv, event);
317 break;
318
319 case MACREG_INT_CODE_MIB_CHANGED:
320 lbs_deb_cmd("EVENT: MIB CHANGED\n");
321 break;
322 case MACREG_INT_CODE_INIT_DONE:
323 lbs_deb_cmd("EVENT: INIT DONE\n");
324 break;
325 case MACREG_INT_CODE_ADHOC_BCN_LOST:
326 lbs_deb_cmd("EVENT: ADHOC beacon lost\n");
327 break;
328 case MACREG_INT_CODE_RSSI_LOW:
329 netdev_alert(priv->dev, "EVENT: rssi low\n");
330 break;
331 case MACREG_INT_CODE_SNR_LOW:
332 netdev_alert(priv->dev, "EVENT: snr low\n");
333 break;
334 case MACREG_INT_CODE_MAX_FAIL:
335 netdev_alert(priv->dev, "EVENT: max fail\n");
336 break;
337 case MACREG_INT_CODE_RSSI_HIGH:
338 netdev_alert(priv->dev, "EVENT: rssi high\n");
339 break;
340 case MACREG_INT_CODE_SNR_HIGH:
341 netdev_alert(priv->dev, "EVENT: snr high\n");
342 break;
343
344 case MACREG_INT_CODE_MESH_AUTO_STARTED:
345 /* Ignore spurious autostart events */
346 netdev_info(priv->dev, "EVENT: MESH_AUTO_STARTED (ignoring)\n");
347 break;
348
349 default:
350 netdev_alert(priv->dev, "EVENT: unknown event id %d\n", event);
351 break;
352 }
353 }
354