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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / net / wireless / intel / iwlwifi / dvm / rx.c
blob673d60784bfadb35bbda9c53a0aa451ddd525b8e
1 // SPDX-License-Identifier: GPL-2.0-only
2 /******************************************************************************
3 *
4 * Copyright(c) 2003 - 2014 Intel Corporation. All rights reserved.
5 * Copyright(c) 2015 Intel Deutschland GmbH
6 * Copyright(c) 2018 Intel Corporation
7 *
8 * Portions of this file are derived from the ipw3945 project, as well
9 * as portionhelp of the ieee80211 subsystem header files.
10 *
11 * Contact Information:
12 * Intel Linux Wireless <linuxwifi@intel.com>
13 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
14 *
15 *****************************************************************************/
16
17 #include <linux/etherdevice.h>
18 #include <linux/slab.h>
19 #include <linux/sched.h>
20 #include <net/mac80211.h>
21 #include <asm/unaligned.h>
22
23 #include "iwl-trans.h"
24 #include "iwl-io.h"
25 #include "dev.h"
26 #include "calib.h"
27 #include "agn.h"
28
29 /******************************************************************************
30 *
31 * Generic RX handler implementations
32 *
33 ******************************************************************************/
34
35 static void iwlagn_rx_reply_error(struct iwl_priv *priv,
36 struct iwl_rx_cmd_buffer *rxb)
37 {
38 struct iwl_rx_packet *pkt = rxb_addr(rxb);
39 struct iwl_error_resp *err_resp = (void *)pkt->data;
40
41 IWL_ERR(priv, "Error Reply type 0x%08X cmd REPLY_ERROR (0x%02X) "
42 "seq 0x%04X ser 0x%08X\n",
43 le32_to_cpu(err_resp->error_type),
44 err_resp->cmd_id,
45 le16_to_cpu(err_resp->bad_cmd_seq_num),
46 le32_to_cpu(err_resp->error_info));
47 }
48
49 static void iwlagn_rx_csa(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb)
50 {
51 struct iwl_rx_packet *pkt = rxb_addr(rxb);
52 struct iwl_csa_notification *csa = (void *)pkt->data;
53 /*
54 * MULTI-FIXME
55 * See iwlagn_mac_channel_switch.
56 */
57 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
58 struct iwl_rxon_cmd *rxon = (void *)&ctx->active;
59
60 if (!test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status))
61 return;
62
63 if (!le32_to_cpu(csa->status) && csa->channel == priv->switch_channel) {
64 rxon->channel = csa->channel;
65 ctx->staging.channel = csa->channel;
66 IWL_DEBUG_11H(priv, "CSA notif: channel %d\n",
67 le16_to_cpu(csa->channel));
68 iwl_chswitch_done(priv, true);
69 } else {
70 IWL_ERR(priv, "CSA notif (fail) : channel %d\n",
71 le16_to_cpu(csa->channel));
72 iwl_chswitch_done(priv, false);
73 }
74 }
75
76
77 static void iwlagn_rx_spectrum_measure_notif(struct iwl_priv *priv,
78 struct iwl_rx_cmd_buffer *rxb)
79 {
80 struct iwl_rx_packet *pkt = rxb_addr(rxb);
81 struct iwl_spectrum_notification *report = (void *)pkt->data;
82
83 if (!report->state) {
84 IWL_DEBUG_11H(priv,
85 "Spectrum Measure Notification: Start\n");
86 return;
87 }
88
89 memcpy(&priv->measure_report, report, sizeof(*report));
90 priv->measurement_status |= MEASUREMENT_READY;
91 }
92
93 static void iwlagn_rx_pm_sleep_notif(struct iwl_priv *priv,
94 struct iwl_rx_cmd_buffer *rxb)
95 {
96 #ifdef CONFIG_IWLWIFI_DEBUG
97 struct iwl_rx_packet *pkt = rxb_addr(rxb);
98 struct iwl_sleep_notification *sleep = (void *)pkt->data;
99 IWL_DEBUG_RX(priv, "sleep mode: %d, src: %d\n",
100 sleep->pm_sleep_mode, sleep->pm_wakeup_src);
101 #endif
102 }
103
104 static void iwlagn_rx_pm_debug_statistics_notif(struct iwl_priv *priv,
105 struct iwl_rx_cmd_buffer *rxb)
106 {
107 struct iwl_rx_packet *pkt = rxb_addr(rxb);
108 u32 __maybe_unused len = iwl_rx_packet_len(pkt);
109 IWL_DEBUG_RADIO(priv, "Dumping %d bytes of unhandled "
110 "notification for PM_DEBUG_STATISTIC_NOTIFIC:\n", len);
111 iwl_print_hex_dump(priv, IWL_DL_RADIO, pkt->data, len);
112 }
113
114 static void iwlagn_rx_beacon_notif(struct iwl_priv *priv,
115 struct iwl_rx_cmd_buffer *rxb)
116 {
117 struct iwl_rx_packet *pkt = rxb_addr(rxb);
118 struct iwlagn_beacon_notif *beacon = (void *)pkt->data;
119 #ifdef CONFIG_IWLWIFI_DEBUG
120 u16 status = le16_to_cpu(beacon->beacon_notify_hdr.status.status);
121 u8 rate = iwl_hw_get_rate(beacon->beacon_notify_hdr.rate_n_flags);
122
123 IWL_DEBUG_RX(priv, "beacon status %#x, retries:%d ibssmgr:%d "
124 "tsf:0x%.8x%.8x rate:%d\n",
125 status & TX_STATUS_MSK,
126 beacon->beacon_notify_hdr.failure_frame,
127 le32_to_cpu(beacon->ibss_mgr_status),
128 le32_to_cpu(beacon->high_tsf),
129 le32_to_cpu(beacon->low_tsf), rate);
130 #endif
131
132 priv->ibss_manager = le32_to_cpu(beacon->ibss_mgr_status);
133 }
134
135 /**
136 * iwl_good_plcp_health - checks for plcp error.
137 *
138 * When the plcp error is exceeding the thresholds, reset the radio
139 * to improve the throughput.
140 */
141 static bool iwlagn_good_plcp_health(struct iwl_priv *priv,
142 struct statistics_rx_phy *cur_ofdm,
143 struct statistics_rx_ht_phy *cur_ofdm_ht,
144 unsigned int msecs)
145 {
146 int delta;
147 int threshold = priv->plcp_delta_threshold;
148
149 if (threshold == IWL_MAX_PLCP_ERR_THRESHOLD_DISABLE) {
150 IWL_DEBUG_RADIO(priv, "plcp_err check disabled\n");
151 return true;
152 }
153
154 delta = le32_to_cpu(cur_ofdm->plcp_err) -
155 le32_to_cpu(priv->statistics.rx_ofdm.plcp_err) +
156 le32_to_cpu(cur_ofdm_ht->plcp_err) -
157 le32_to_cpu(priv->statistics.rx_ofdm_ht.plcp_err);
158
159 /* Can be negative if firmware reset statistics */
160 if (delta <= 0)
161 return true;
162
163 if ((delta * 100 / msecs) > threshold) {
164 IWL_DEBUG_RADIO(priv,
165 "plcp health threshold %u delta %d msecs %u\n",
166 threshold, delta, msecs);
167 return false;
168 }
169
170 return true;
171 }
172
173 int iwl_force_rf_reset(struct iwl_priv *priv, bool external)
174 {
175 struct iwl_rf_reset *rf_reset;
176
177 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
178 return -EAGAIN;
179
180 if (!iwl_is_any_associated(priv)) {
181 IWL_DEBUG_SCAN(priv, "force reset rejected: not associated\n");
182 return -ENOLINK;
183 }
184
185 rf_reset = &priv->rf_reset;
186 rf_reset->reset_request_count++;
187 if (!external && rf_reset->last_reset_jiffies &&
188 time_after(rf_reset->last_reset_jiffies +
189 IWL_DELAY_NEXT_FORCE_RF_RESET, jiffies)) {
190 IWL_DEBUG_INFO(priv, "RF reset rejected\n");
191 rf_reset->reset_reject_count++;
192 return -EAGAIN;
193 }
194 rf_reset->reset_success_count++;
195 rf_reset->last_reset_jiffies = jiffies;
196
197 /*
198 * There is no easy and better way to force reset the radio,
199 * the only known method is switching channel which will force to
200 * reset and tune the radio.
201 * Use internal short scan (single channel) operation to should
202 * achieve this objective.
203 * Driver should reset the radio when number of consecutive missed
204 * beacon, or any other uCode error condition detected.
205 */
206 IWL_DEBUG_INFO(priv, "perform radio reset.\n");
207 iwl_internal_short_hw_scan(priv);
208 return 0;
209 }
210
211
212 static void iwlagn_recover_from_statistics(struct iwl_priv *priv,
213 struct statistics_rx_phy *cur_ofdm,
214 struct statistics_rx_ht_phy *cur_ofdm_ht,
215 struct statistics_tx *tx,
216 unsigned long stamp)
217 {
218 unsigned int msecs;
219
220 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
221 return;
222
223 msecs = jiffies_to_msecs(stamp - priv->rx_statistics_jiffies);
224
225 /* Only gather statistics and update time stamp when not associated */
226 if (!iwl_is_any_associated(priv))
227 return;
228
229 /* Do not check/recover when do not have enough statistics data */
230 if (msecs < 99)
231 return;
232
233 if (!iwlagn_good_plcp_health(priv, cur_ofdm, cur_ofdm_ht, msecs))
234 iwl_force_rf_reset(priv, false);
235 }
236
237 /* Calculate noise level, based on measurements during network silence just
238 * before arriving beacon. This measurement can be done only if we know
239 * exactly when to expect beacons, therefore only when we're associated. */
240 static void iwlagn_rx_calc_noise(struct iwl_priv *priv)
241 {
242 struct statistics_rx_non_phy *rx_info;
243 int num_active_rx = 0;
244 int total_silence = 0;
245 int bcn_silence_a, bcn_silence_b, bcn_silence_c;
246 int last_rx_noise;
247
248 rx_info = &priv->statistics.rx_non_phy;
249
250 bcn_silence_a =
251 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
252 bcn_silence_b =
253 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
254 bcn_silence_c =
255 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
256
257 if (bcn_silence_a) {
258 total_silence += bcn_silence_a;
259 num_active_rx++;
260 }
261 if (bcn_silence_b) {
262 total_silence += bcn_silence_b;
263 num_active_rx++;
264 }
265 if (bcn_silence_c) {
266 total_silence += bcn_silence_c;
267 num_active_rx++;
268 }
269
270 /* Average among active antennas */
271 if (num_active_rx)
272 last_rx_noise = (total_silence / num_active_rx) - 107;
273 else
274 last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
275
276 IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n",
277 bcn_silence_a, bcn_silence_b, bcn_silence_c,
278 last_rx_noise);
279 }
280
281 #ifdef CONFIG_IWLWIFI_DEBUGFS
282 /*
283 * based on the assumption of all statistics counter are in DWORD
284 * FIXME: This function is for debugging, do not deal with
285 * the case of counters roll-over.
286 */
287 static void accum_stats(__le32 *prev, __le32 *cur, __le32 *delta,
288 __le32 *max_delta, __le32 *accum, int size)
289 {
290 int i;
291
292 for (i = 0;
293 i < size / sizeof(__le32);
294 i++, prev++, cur++, delta++, max_delta++, accum++) {
295 if (le32_to_cpu(*cur) > le32_to_cpu(*prev)) {
296 *delta = cpu_to_le32(
297 le32_to_cpu(*cur) - le32_to_cpu(*prev));
298 le32_add_cpu(accum, le32_to_cpu(*delta));
299 if (le32_to_cpu(*delta) > le32_to_cpu(*max_delta))
300 *max_delta = *delta;
301 }
302 }
303 }
304
305 static void
306 iwlagn_accumulative_statistics(struct iwl_priv *priv,
307 struct statistics_general_common *common,
308 struct statistics_rx_non_phy *rx_non_phy,
309 struct statistics_rx_phy *rx_ofdm,
310 struct statistics_rx_ht_phy *rx_ofdm_ht,
311 struct statistics_rx_phy *rx_cck,
312 struct statistics_tx *tx,
313 struct statistics_bt_activity *bt_activity)
314 {
315 #define ACCUM(_name) \
316 accum_stats((__le32 *)&priv->statistics._name, \
317 (__le32 *)_name, \
318 (__le32 *)&priv->delta_stats._name, \
319 (__le32 *)&priv->max_delta_stats._name, \
320 (__le32 *)&priv->accum_stats._name, \
321 sizeof(*_name));
322
323 ACCUM(common);
324 ACCUM(rx_non_phy);
325 ACCUM(rx_ofdm);
326 ACCUM(rx_ofdm_ht);
327 ACCUM(rx_cck);
328 ACCUM(tx);
329 if (bt_activity)
330 ACCUM(bt_activity);
331 #undef ACCUM
332 }
333 #else
334 static inline void
335 iwlagn_accumulative_statistics(struct iwl_priv *priv,
336 struct statistics_general_common *common,
337 struct statistics_rx_non_phy *rx_non_phy,
338 struct statistics_rx_phy *rx_ofdm,
339 struct statistics_rx_ht_phy *rx_ofdm_ht,
340 struct statistics_rx_phy *rx_cck,
341 struct statistics_tx *tx,
342 struct statistics_bt_activity *bt_activity)
343 {
344 }
345 #endif
346
347 static void iwlagn_rx_statistics(struct iwl_priv *priv,
348 struct iwl_rx_cmd_buffer *rxb)
349 {
350 unsigned long stamp = jiffies;
351 const int reg_recalib_period = 60;
352 int change;
353 struct iwl_rx_packet *pkt = rxb_addr(rxb);
354 u32 len = iwl_rx_packet_payload_len(pkt);
355 __le32 *flag;
356 struct statistics_general_common *common;
357 struct statistics_rx_non_phy *rx_non_phy;
358 struct statistics_rx_phy *rx_ofdm;
359 struct statistics_rx_ht_phy *rx_ofdm_ht;
360 struct statistics_rx_phy *rx_cck;
361 struct statistics_tx *tx;
362 struct statistics_bt_activity *bt_activity;
363
364 IWL_DEBUG_RX(priv, "Statistics notification received (%d bytes).\n",
365 len);
366
367 spin_lock(&priv->statistics.lock);
368
369 if (len == sizeof(struct iwl_bt_notif_statistics)) {
370 struct iwl_bt_notif_statistics *stats;
371 stats = (void *)&pkt->data;
372 flag = &stats->flag;
373 common = &stats->general.common;
374 rx_non_phy = &stats->rx.general.common;
375 rx_ofdm = &stats->rx.ofdm;
376 rx_ofdm_ht = &stats->rx.ofdm_ht;
377 rx_cck = &stats->rx.cck;
378 tx = &stats->tx;
379 bt_activity = &stats->general.activity;
380
381 #ifdef CONFIG_IWLWIFI_DEBUGFS
382 /* handle this exception directly */
383 priv->statistics.num_bt_kills = stats->rx.general.num_bt_kills;
384 le32_add_cpu(&priv->statistics.accum_num_bt_kills,
385 le32_to_cpu(stats->rx.general.num_bt_kills));
386 #endif
387 } else if (len == sizeof(struct iwl_notif_statistics)) {
388 struct iwl_notif_statistics *stats;
389 stats = (void *)&pkt->data;
390 flag = &stats->flag;
391 common = &stats->general.common;
392 rx_non_phy = &stats->rx.general;
393 rx_ofdm = &stats->rx.ofdm;
394 rx_ofdm_ht = &stats->rx.ofdm_ht;
395 rx_cck = &stats->rx.cck;
396 tx = &stats->tx;
397 bt_activity = NULL;
398 } else {
399 WARN_ONCE(1, "len %d doesn't match BT (%zu) or normal (%zu)\n",
400 len, sizeof(struct iwl_bt_notif_statistics),
401 sizeof(struct iwl_notif_statistics));
402 spin_unlock(&priv->statistics.lock);
403 return;
404 }
405
406 change = common->temperature != priv->statistics.common.temperature ||
407 (*flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
408 (priv->statistics.flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK);
409
410 iwlagn_accumulative_statistics(priv, common, rx_non_phy, rx_ofdm,
411 rx_ofdm_ht, rx_cck, tx, bt_activity);
412
413 iwlagn_recover_from_statistics(priv, rx_ofdm, rx_ofdm_ht, tx, stamp);
414
415 priv->statistics.flag = *flag;
416 memcpy(&priv->statistics.common, common, sizeof(*common));
417 memcpy(&priv->statistics.rx_non_phy, rx_non_phy, sizeof(*rx_non_phy));
418 memcpy(&priv->statistics.rx_ofdm, rx_ofdm, sizeof(*rx_ofdm));
419 memcpy(&priv->statistics.rx_ofdm_ht, rx_ofdm_ht, sizeof(*rx_ofdm_ht));
420 memcpy(&priv->statistics.rx_cck, rx_cck, sizeof(*rx_cck));
421 memcpy(&priv->statistics.tx, tx, sizeof(*tx));
422 #ifdef CONFIG_IWLWIFI_DEBUGFS
423 if (bt_activity)
424 memcpy(&priv->statistics.bt_activity, bt_activity,
425 sizeof(*bt_activity));
426 #endif
427
428 priv->rx_statistics_jiffies = stamp;
429
430 set_bit(STATUS_STATISTICS, &priv->status);
431
432 /* Reschedule the statistics timer to occur in
433 * reg_recalib_period seconds to ensure we get a
434 * thermal update even if the uCode doesn't give
435 * us one */
436 mod_timer(&priv->statistics_periodic, jiffies +
437 msecs_to_jiffies(reg_recalib_period * 1000));
438
439 if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
440 (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
441 iwlagn_rx_calc_noise(priv);
442 queue_work(priv->workqueue, &priv->run_time_calib_work);
443 }
444 if (priv->lib->temperature && change)
445 priv->lib->temperature(priv);
446
447 spin_unlock(&priv->statistics.lock);
448 }
449
450 static void iwlagn_rx_reply_statistics(struct iwl_priv *priv,
451 struct iwl_rx_cmd_buffer *rxb)
452 {
453 struct iwl_rx_packet *pkt = rxb_addr(rxb);
454 struct iwl_notif_statistics *stats = (void *)pkt->data;
455
456 if (le32_to_cpu(stats->flag) & UCODE_STATISTICS_CLEAR_MSK) {
457 #ifdef CONFIG_IWLWIFI_DEBUGFS
458 memset(&priv->accum_stats, 0,
459 sizeof(priv->accum_stats));
460 memset(&priv->delta_stats, 0,
461 sizeof(priv->delta_stats));
462 memset(&priv->max_delta_stats, 0,
463 sizeof(priv->max_delta_stats));
464 #endif
465 IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
466 }
467
468 iwlagn_rx_statistics(priv, rxb);
469 }
470
471 /* Handle notification from uCode that card's power state is changing
472 * due to software, hardware, or critical temperature RFKILL */
473 static void iwlagn_rx_card_state_notif(struct iwl_priv *priv,
474 struct iwl_rx_cmd_buffer *rxb)
475 {
476 struct iwl_rx_packet *pkt = rxb_addr(rxb);
477 struct iwl_card_state_notif *card_state_notif = (void *)pkt->data;
478 u32 flags = le32_to_cpu(card_state_notif->flags);
479 unsigned long status = priv->status;
480
481 IWL_DEBUG_RF_KILL(priv, "Card state received: HW:%s SW:%s CT:%s\n",
482 (flags & HW_CARD_DISABLED) ? "Kill" : "On",
483 (flags & SW_CARD_DISABLED) ? "Kill" : "On",
484 (flags & CT_CARD_DISABLED) ?
485 "Reached" : "Not reached");
486
487 if (flags & (SW_CARD_DISABLED | HW_CARD_DISABLED |
488 CT_CARD_DISABLED)) {
489
490 iwl_write32(priv->trans, CSR_UCODE_DRV_GP1_SET,
491 CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
492
493 iwl_write_direct32(priv->trans, HBUS_TARG_MBX_C,
494 HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);
495
496 if (!(flags & RXON_CARD_DISABLED)) {
497 iwl_write32(priv->trans, CSR_UCODE_DRV_GP1_CLR,
498 CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
499 iwl_write_direct32(priv->trans, HBUS_TARG_MBX_C,
500 HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);
501 }
502 if (flags & CT_CARD_DISABLED)
503 iwl_tt_enter_ct_kill(priv);
504 }
505 if (!(flags & CT_CARD_DISABLED))
506 iwl_tt_exit_ct_kill(priv);
507
508 if (flags & HW_CARD_DISABLED)
509 set_bit(STATUS_RF_KILL_HW, &priv->status);
510 else
511 clear_bit(STATUS_RF_KILL_HW, &priv->status);
512
513
514 if (!(flags & RXON_CARD_DISABLED))
515 iwl_scan_cancel(priv);
516
517 if ((test_bit(STATUS_RF_KILL_HW, &status) !=
518 test_bit(STATUS_RF_KILL_HW, &priv->status)))
519 wiphy_rfkill_set_hw_state(priv->hw->wiphy,
520 test_bit(STATUS_RF_KILL_HW, &priv->status));
521 }
522
523 static void iwlagn_rx_missed_beacon_notif(struct iwl_priv *priv,
524 struct iwl_rx_cmd_buffer *rxb)
525
526 {
527 struct iwl_rx_packet *pkt = rxb_addr(rxb);
528 struct iwl_missed_beacon_notif *missed_beacon = (void *)pkt->data;
529
530 if (le32_to_cpu(missed_beacon->consecutive_missed_beacons) >
531 priv->missed_beacon_threshold) {
532 IWL_DEBUG_CALIB(priv,
533 "missed bcn cnsq %d totl %d rcd %d expctd %d\n",
534 le32_to_cpu(missed_beacon->consecutive_missed_beacons),
535 le32_to_cpu(missed_beacon->total_missed_becons),
536 le32_to_cpu(missed_beacon->num_recvd_beacons),
537 le32_to_cpu(missed_beacon->num_expected_beacons));
538 if (!test_bit(STATUS_SCANNING, &priv->status))
539 iwl_init_sensitivity(priv);
540 }
541 }
542
543 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
544 * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
545 static void iwlagn_rx_reply_rx_phy(struct iwl_priv *priv,
546 struct iwl_rx_cmd_buffer *rxb)
547 {
548 struct iwl_rx_packet *pkt = rxb_addr(rxb);
549
550 priv->last_phy_res_valid = true;
551 priv->ampdu_ref++;
552 memcpy(&priv->last_phy_res, pkt->data,
553 sizeof(struct iwl_rx_phy_res));
554 }
555
556 /*
557 * returns non-zero if packet should be dropped
558 */
559 static int iwlagn_set_decrypted_flag(struct iwl_priv *priv,
560 struct ieee80211_hdr *hdr,
561 u32 decrypt_res,
562 struct ieee80211_rx_status *stats)
563 {
564 u16 fc = le16_to_cpu(hdr->frame_control);
565
566 /*
567 * All contexts have the same setting here due to it being
568 * a module parameter, so OK to check any context.
569 */
570 if (priv->contexts[IWL_RXON_CTX_BSS].active.filter_flags &
571 RXON_FILTER_DIS_DECRYPT_MSK)
572 return 0;
573
574 if (!(fc & IEEE80211_FCTL_PROTECTED))
575 return 0;
576
577 IWL_DEBUG_RX(priv, "decrypt_res:0x%x\n", decrypt_res);
578 switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
579 case RX_RES_STATUS_SEC_TYPE_TKIP:
580 /* The uCode has got a bad phase 1 Key, pushes the packet.
581 * Decryption will be done in SW. */
582 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
583 RX_RES_STATUS_BAD_KEY_TTAK)
584 break;
585 /* fall through */
586 case RX_RES_STATUS_SEC_TYPE_WEP:
587 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
588 RX_RES_STATUS_BAD_ICV_MIC) {
589 /* bad ICV, the packet is destroyed since the
590 * decryption is inplace, drop it */
591 IWL_DEBUG_RX(priv, "Packet destroyed\n");
592 return -1;
593 }
594 /* fall through */
595 case RX_RES_STATUS_SEC_TYPE_CCMP:
596 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
597 RX_RES_STATUS_DECRYPT_OK) {
598 IWL_DEBUG_RX(priv, "hw decrypt successfully!!!\n");
599 stats->flag |= RX_FLAG_DECRYPTED;
600 }
601 break;
602
603 default:
604 break;
605 }
606 return 0;
607 }
608
609 static void iwlagn_pass_packet_to_mac80211(struct iwl_priv *priv,
610 struct ieee80211_hdr *hdr,
611 u16 len,
612 u32 ampdu_status,
613 struct iwl_rx_cmd_buffer *rxb,
614 struct ieee80211_rx_status *stats)
615 {
616 struct sk_buff *skb;
617 __le16 fc = hdr->frame_control;
618 struct iwl_rxon_context *ctx;
619 unsigned int hdrlen, fraglen;
620
621 /* We only process data packets if the interface is open */
622 if (unlikely(!priv->is_open)) {
623 IWL_DEBUG_DROP_LIMIT(priv,
624 "Dropping packet while interface is not open.\n");
625 return;
626 }
627
628 /* In case of HW accelerated crypto and bad decryption, drop */
629 if (!iwlwifi_mod_params.swcrypto &&
630 iwlagn_set_decrypted_flag(priv, hdr, ampdu_status, stats))
631 return;
632
633 /* Dont use dev_alloc_skb(), we'll have enough headroom once
634 * ieee80211_hdr pulled.
635 */
636 skb = alloc_skb(128, GFP_ATOMIC);
637 if (!skb) {
638 IWL_ERR(priv, "alloc_skb failed\n");
639 return;
640 }
641 /* If frame is small enough to fit in skb->head, pull it completely.
642 * If not, only pull ieee80211_hdr so that splice() or TCP coalesce
643 * are more efficient.
644 */
645 hdrlen = (len <= skb_tailroom(skb)) ? len : sizeof(*hdr);
646
647 skb_put_data(skb, hdr, hdrlen);
648 fraglen = len - hdrlen;
649
650 if (fraglen) {
651 int offset = (void *)hdr + hdrlen -
652 rxb_addr(rxb) + rxb_offset(rxb);
653
654 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
655 fraglen, rxb->truesize);
656 }
657
658 /*
659 * Wake any queues that were stopped due to a passive channel tx
660 * failure. This can happen because the regulatory enforcement in
661 * the device waits for a beacon before allowing transmission,
662 * sometimes even after already having transmitted frames for the
663 * association because the new RXON may reset the information.
664 */
665 if (unlikely(ieee80211_is_beacon(fc) && priv->passive_no_rx)) {
666 for_each_context(priv, ctx) {
667 if (!ether_addr_equal(hdr->addr3,
668 ctx->active.bssid_addr))
669 continue;
670 iwlagn_lift_passive_no_rx(priv);
671 }
672 }
673
674 memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
675
676 ieee80211_rx_napi(priv->hw, NULL, skb, priv->napi);
677 }
678
679 static u32 iwlagn_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
680 {
681 u32 decrypt_out = 0;
682
683 if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
684 RX_RES_STATUS_STATION_FOUND)
685 decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
686 RX_RES_STATUS_NO_STATION_INFO_MISMATCH);
687
688 decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
689
690 /* packet was not encrypted */
691 if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
692 RX_RES_STATUS_SEC_TYPE_NONE)
693 return decrypt_out;
694
695 /* packet was encrypted with unknown alg */
696 if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
697 RX_RES_STATUS_SEC_TYPE_ERR)
698 return decrypt_out;
699
700 /* decryption was not done in HW */
701 if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
702 RX_MPDU_RES_STATUS_DEC_DONE_MSK)
703 return decrypt_out;
704
705 switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
706
707 case RX_RES_STATUS_SEC_TYPE_CCMP:
708 /* alg is CCM: check MIC only */
709 if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
710 /* Bad MIC */
711 decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
712 else
713 decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
714
715 break;
716
717 case RX_RES_STATUS_SEC_TYPE_TKIP:
718 if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
719 /* Bad TTAK */
720 decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
721 break;
722 }
723 /* fall through */
724 default:
725 if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
726 decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
727 else
728 decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
729 break;
730 }
731
732 IWL_DEBUG_RX(priv, "decrypt_in:0x%x decrypt_out = 0x%x\n",
733 decrypt_in, decrypt_out);
734
735 return decrypt_out;
736 }
737
738 /* Calc max signal level (dBm) among 3 possible receivers */
739 static int iwlagn_calc_rssi(struct iwl_priv *priv,
740 struct iwl_rx_phy_res *rx_resp)
741 {
742 /* data from PHY/DSP regarding signal strength, etc.,
743 * contents are always there, not configurable by host
744 */
745 struct iwlagn_non_cfg_phy *ncphy =
746 (struct iwlagn_non_cfg_phy *)rx_resp->non_cfg_phy_buf;
747 u32 val, rssi_a, rssi_b, rssi_c, max_rssi;
748 u8 agc;
749
750 val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_AGC_IDX]);
751 agc = (val & IWLAGN_OFDM_AGC_MSK) >> IWLAGN_OFDM_AGC_BIT_POS;
752
753 /* Find max rssi among 3 possible receivers.
754 * These values are measured by the digital signal processor (DSP).
755 * They should stay fairly constant even as the signal strength varies,
756 * if the radio's automatic gain control (AGC) is working right.
757 * AGC value (see below) will provide the "interesting" info.
758 */
759 val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_AB_IDX]);
760 rssi_a = (val & IWLAGN_OFDM_RSSI_INBAND_A_BITMSK) >>
761 IWLAGN_OFDM_RSSI_A_BIT_POS;
762 rssi_b = (val & IWLAGN_OFDM_RSSI_INBAND_B_BITMSK) >>
763 IWLAGN_OFDM_RSSI_B_BIT_POS;
764 val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_C_IDX]);
765 rssi_c = (val & IWLAGN_OFDM_RSSI_INBAND_C_BITMSK) >>
766 IWLAGN_OFDM_RSSI_C_BIT_POS;
767
768 max_rssi = max_t(u32, rssi_a, rssi_b);
769 max_rssi = max_t(u32, max_rssi, rssi_c);
770
771 IWL_DEBUG_STATS(priv, "Rssi In A %d B %d C %d Max %d AGC dB %d\n",
772 rssi_a, rssi_b, rssi_c, max_rssi, agc);
773
774 /* dBm = max_rssi dB - agc dB - constant.
775 * Higher AGC (higher radio gain) means lower signal. */
776 return max_rssi - agc - IWLAGN_RSSI_OFFSET;
777 }
778
779 /* Called for REPLY_RX_MPDU_CMD */
780 static void iwlagn_rx_reply_rx(struct iwl_priv *priv,
781 struct iwl_rx_cmd_buffer *rxb)
782 {
783 struct ieee80211_hdr *header;
784 struct ieee80211_rx_status rx_status = {};
785 struct iwl_rx_packet *pkt = rxb_addr(rxb);
786 struct iwl_rx_phy_res *phy_res;
787 __le32 rx_pkt_status;
788 struct iwl_rx_mpdu_res_start *amsdu;
789 u32 len;
790 u32 ampdu_status;
791 u32 rate_n_flags;
792
793 if (!priv->last_phy_res_valid) {
794 IWL_ERR(priv, "MPDU frame without cached PHY data\n");
795 return;
796 }
797 phy_res = &priv->last_phy_res;
798 amsdu = (struct iwl_rx_mpdu_res_start *)pkt->data;
799 header = (struct ieee80211_hdr *)(pkt->data + sizeof(*amsdu));
800 len = le16_to_cpu(amsdu->byte_count);
801 rx_pkt_status = *(__le32 *)(pkt->data + sizeof(*amsdu) + len);
802 ampdu_status = iwlagn_translate_rx_status(priv,
803 le32_to_cpu(rx_pkt_status));
804
805 if ((unlikely(phy_res->cfg_phy_cnt > 20))) {
806 IWL_DEBUG_DROP(priv, "dsp size out of range [0,20]: %d\n",
807 phy_res->cfg_phy_cnt);
808 return;
809 }
810
811 if (!(rx_pkt_status & RX_RES_STATUS_NO_CRC32_ERROR) ||
812 !(rx_pkt_status & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
813 IWL_DEBUG_RX(priv, "Bad CRC or FIFO: 0x%08X.\n",
814 le32_to_cpu(rx_pkt_status));
815 return;
816 }
817
818 /* This will be used in several places later */
819 rate_n_flags = le32_to_cpu(phy_res->rate_n_flags);
820
821 /* rx_status carries information about the packet to mac80211 */
822 rx_status.mactime = le64_to_cpu(phy_res->timestamp);
823 rx_status.band = (phy_res->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
824 NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
825 rx_status.freq =
826 ieee80211_channel_to_frequency(le16_to_cpu(phy_res->channel),
827 rx_status.band);
828 rx_status.rate_idx =
829 iwlagn_hwrate_to_mac80211_idx(rate_n_flags, rx_status.band);
830 rx_status.flag = 0;
831
832 /* TSF isn't reliable. In order to allow smooth user experience,
833 * this W/A doesn't propagate it to the mac80211 */
834 /*rx_status.flag |= RX_FLAG_MACTIME_START;*/
835
836 priv->ucode_beacon_time = le32_to_cpu(phy_res->beacon_time_stamp);
837
838 /* Find max signal strength (dBm) among 3 antenna/receiver chains */
839 rx_status.signal = iwlagn_calc_rssi(priv, phy_res);
840
841 IWL_DEBUG_STATS_LIMIT(priv, "Rssi %d, TSF %llu\n",
842 rx_status.signal, (unsigned long long)rx_status.mactime);
843
844 /*
845 * "antenna number"
846 *
847 * It seems that the antenna field in the phy flags value
848 * is actually a bit field. This is undefined by radiotap,
849 * it wants an actual antenna number but I always get "7"
850 * for most legacy frames I receive indicating that the
851 * same frame was received on all three RX chains.
852 *
853 * I think this field should be removed in favor of a
854 * new 802.11n radiotap field "RX chains" that is defined
855 * as a bitmask.
856 */
857 rx_status.antenna =
858 (le16_to_cpu(phy_res->phy_flags) & RX_RES_PHY_FLAGS_ANTENNA_MSK)
859 >> RX_RES_PHY_FLAGS_ANTENNA_POS;
860
861 /* set the preamble flag if appropriate */
862 if (phy_res->phy_flags & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK)
863 rx_status.enc_flags |= RX_ENC_FLAG_SHORTPRE;
864
865 if (phy_res->phy_flags & RX_RES_PHY_FLAGS_AGG_MSK) {
866 /*
867 * We know which subframes of an A-MPDU belong
868 * together since we get a single PHY response
869 * from the firmware for all of them
870 */
871 rx_status.flag |= RX_FLAG_AMPDU_DETAILS;
872 rx_status.ampdu_reference = priv->ampdu_ref;
873 }
874
875 /* Set up the HT phy flags */
876 if (rate_n_flags & RATE_MCS_HT_MSK)
877 rx_status.encoding = RX_ENC_HT;
878 if (rate_n_flags & RATE_MCS_HT40_MSK)
879 rx_status.bw = RATE_INFO_BW_40;
880 else
881 rx_status.bw = RATE_INFO_BW_20;
882 if (rate_n_flags & RATE_MCS_SGI_MSK)
883 rx_status.enc_flags |= RX_ENC_FLAG_SHORT_GI;
884 if (rate_n_flags & RATE_MCS_GF_MSK)
885 rx_status.enc_flags |= RX_ENC_FLAG_HT_GF;
886
887 iwlagn_pass_packet_to_mac80211(priv, header, len, ampdu_status,
888 rxb, &rx_status);
889 }
890
891 static void iwlagn_rx_noa_notification(struct iwl_priv *priv,
892 struct iwl_rx_cmd_buffer *rxb)
893 {
894 struct iwl_wipan_noa_data *new_data, *old_data;
895 struct iwl_rx_packet *pkt = rxb_addr(rxb);
896 struct iwl_wipan_noa_notification *noa_notif = (void *)pkt->data;
897
898 /* no condition -- we're in softirq */
899 old_data = rcu_dereference_protected(priv->noa_data, true);
900
901 if (noa_notif->noa_active) {
902 u32 len = le16_to_cpu(noa_notif->noa_attribute.length);
903 u32 copylen = len;
904
905 /* EID, len, OUI, subtype */
906 len += 1 + 1 + 3 + 1;
907 /* P2P id, P2P length */
908 len += 1 + 2;
909 copylen += 1 + 2;
910
911 new_data = kmalloc(sizeof(*new_data) + len, GFP_ATOMIC);
912 if (new_data) {
913 new_data->length = len;
914 new_data->data[0] = WLAN_EID_VENDOR_SPECIFIC;
915 new_data->data[1] = len - 2; /* not counting EID, len */
916 new_data->data[2] = (WLAN_OUI_WFA >> 16) & 0xff;
917 new_data->data[3] = (WLAN_OUI_WFA >> 8) & 0xff;
918 new_data->data[4] = (WLAN_OUI_WFA >> 0) & 0xff;
919 new_data->data[5] = WLAN_OUI_TYPE_WFA_P2P;
920 memcpy(&new_data->data[6], &noa_notif->noa_attribute,
921 copylen);
922 }
923 } else
924 new_data = NULL;
925
926 rcu_assign_pointer(priv->noa_data, new_data);
927
928 if (old_data)
929 kfree_rcu(old_data, rcu_head);
930 }
931
932 /**
933 * iwl_setup_rx_handlers - Initialize Rx handler callbacks
934 *
935 * Setup the RX handlers for each of the reply types sent from the uCode
936 * to the host.
937 */
938 void iwl_setup_rx_handlers(struct iwl_priv *priv)
939 {
940 void (**handlers)(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb);
941
942 handlers = priv->rx_handlers;
943
944 handlers[REPLY_ERROR] = iwlagn_rx_reply_error;
945 handlers[CHANNEL_SWITCH_NOTIFICATION] = iwlagn_rx_csa;
946 handlers[SPECTRUM_MEASURE_NOTIFICATION] =
947 iwlagn_rx_spectrum_measure_notif;
948 handlers[PM_SLEEP_NOTIFICATION] = iwlagn_rx_pm_sleep_notif;
949 handlers[PM_DEBUG_STATISTIC_NOTIFIC] =
950 iwlagn_rx_pm_debug_statistics_notif;
951 handlers[BEACON_NOTIFICATION] = iwlagn_rx_beacon_notif;
952 handlers[REPLY_ADD_STA] = iwl_add_sta_callback;
953
954 handlers[REPLY_WIPAN_NOA_NOTIFICATION] = iwlagn_rx_noa_notification;
955
956 /*
957 * The same handler is used for both the REPLY to a discrete
958 * statistics request from the host as well as for the periodic
959 * statistics notifications (after received beacons) from the uCode.
960 */
961 handlers[REPLY_STATISTICS_CMD] = iwlagn_rx_reply_statistics;
962 handlers[STATISTICS_NOTIFICATION] = iwlagn_rx_statistics;
963
964 iwl_setup_rx_scan_handlers(priv);
965
966 handlers[CARD_STATE_NOTIFICATION] = iwlagn_rx_card_state_notif;
967 handlers[MISSED_BEACONS_NOTIFICATION] =
968 iwlagn_rx_missed_beacon_notif;
969
970 /* Rx handlers */
971 handlers[REPLY_RX_PHY_CMD] = iwlagn_rx_reply_rx_phy;
972 handlers[REPLY_RX_MPDU_CMD] = iwlagn_rx_reply_rx;
973
974 /* block ack */
975 handlers[REPLY_COMPRESSED_BA] =
976 iwlagn_rx_reply_compressed_ba;
977
978 priv->rx_handlers[REPLY_TX] = iwlagn_rx_reply_tx;
979
980 /* set up notification wait support */
981 iwl_notification_wait_init(&priv->notif_wait);
982
983 /* Set up BT Rx handlers */
984 if (priv->lib->bt_params)
985 iwlagn_bt_rx_handler_setup(priv);
986 }
987
988 void iwl_rx_dispatch(struct iwl_op_mode *op_mode, struct napi_struct *napi,
989 struct iwl_rx_cmd_buffer *rxb)
990 {
991 struct iwl_rx_packet *pkt = rxb_addr(rxb);
992 struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode);
993
994 /*
995 * Do the notification wait before RX handlers so
996 * even if the RX handler consumes the RXB we have
997 * access to it in the notification wait entry.
998 */
999 iwl_notification_wait_notify(&priv->notif_wait, pkt);
1000
1001 /* Based on type of command response or notification,
1002 * handle those that need handling via function in
1003 * rx_handlers table. See iwl_setup_rx_handlers() */
1004 if (priv->rx_handlers[pkt->hdr.cmd]) {
1005 priv->rx_handlers_stats[pkt->hdr.cmd]++;
1006 priv->rx_handlers[pkt->hdr.cmd](priv, rxb);
1007 } else {
1008 /* No handling needed */
1009 IWL_DEBUG_RX(priv, "No handler needed for %s, 0x%02x\n",
1010 iwl_get_cmd_string(priv->trans,
1011 iwl_cmd_id(pkt->hdr.cmd,
1012 0, 0)),
1013 pkt->hdr.cmd);
1014 }
1015 }
Linux with added FPC-III support