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a55360e4 TW |
1 | /****************************************************************************** |
2 | * | |
901069c7 | 3 | * Copyright(c) 2003 - 2011 Intel Corporation. All rights reserved. |
a55360e4 TW |
4 | * |
5 | * Portions of this file are derived from the ipw3945 project, as well | |
6 | * as portions of the ieee80211 subsystem header files. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of version 2 of the GNU General Public License as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
13 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
15 | * more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License along with | |
18 | * this program; if not, write to the Free Software Foundation, Inc., | |
19 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA | |
20 | * | |
21 | * The full GNU General Public License is included in this distribution in the | |
22 | * file called LICENSE. | |
23 | * | |
24 | * Contact Information: | |
759ef89f | 25 | * Intel Linux Wireless <ilw@linux.intel.com> |
a55360e4 TW |
26 | * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 |
27 | * | |
28 | *****************************************************************************/ | |
29 | ||
1781a07f | 30 | #include <linux/etherdevice.h> |
5a0e3ad6 | 31 | #include <linux/slab.h> |
118253ca | 32 | #include <linux/sched.h> |
a55360e4 | 33 | #include <net/mac80211.h> |
a05ffd39 | 34 | #include <asm/unaligned.h> |
a55360e4 TW |
35 | #include "iwl-eeprom.h" |
36 | #include "iwl-dev.h" | |
37 | #include "iwl-core.h" | |
38 | #include "iwl-sta.h" | |
39 | #include "iwl-io.h" | |
40 | #include "iwl-helpers.h" | |
67289941 | 41 | #include "iwl-agn-calib.h" |
466a19a0 SG |
42 | #include "iwl-agn.h" |
43 | ||
44 | /****************************************************************************** | |
45 | * | |
46 | * RX path functions | |
47 | * | |
48 | ******************************************************************************/ | |
49 | ||
a55360e4 TW |
50 | /* |
51 | * Rx theory of operation | |
52 | * | |
53 | * Driver allocates a circular buffer of Receive Buffer Descriptors (RBDs), | |
54 | * each of which point to Receive Buffers to be filled by the NIC. These get | |
55 | * used not only for Rx frames, but for any command response or notification | |
56 | * from the NIC. The driver and NIC manage the Rx buffers by means | |
57 | * of indexes into the circular buffer. | |
58 | * | |
59 | * Rx Queue Indexes | |
60 | * The host/firmware share two index registers for managing the Rx buffers. | |
61 | * | |
62 | * The READ index maps to the first position that the firmware may be writing | |
63 | * to -- the driver can read up to (but not including) this position and get | |
64 | * good data. | |
65 | * The READ index is managed by the firmware once the card is enabled. | |
66 | * | |
67 | * The WRITE index maps to the last position the driver has read from -- the | |
68 | * position preceding WRITE is the last slot the firmware can place a packet. | |
69 | * | |
70 | * The queue is empty (no good data) if WRITE = READ - 1, and is full if | |
71 | * WRITE = READ. | |
72 | * | |
73 | * During initialization, the host sets up the READ queue position to the first | |
74 | * INDEX position, and WRITE to the last (READ - 1 wrapped) | |
75 | * | |
76 | * When the firmware places a packet in a buffer, it will advance the READ index | |
77 | * and fire the RX interrupt. The driver can then query the READ index and | |
78 | * process as many packets as possible, moving the WRITE index forward as it | |
79 | * resets the Rx queue buffers with new memory. | |
80 | * | |
81 | * The management in the driver is as follows: | |
82 | * + A list of pre-allocated SKBs is stored in iwl->rxq->rx_free. When | |
83 | * iwl->rxq->free_count drops to or below RX_LOW_WATERMARK, work is scheduled | |
84 | * to replenish the iwl->rxq->rx_free. | |
85 | * + In iwl_rx_replenish (scheduled) if 'processed' != 'read' then the | |
86 | * iwl->rxq is replenished and the READ INDEX is updated (updating the | |
87 | * 'processed' and 'read' driver indexes as well) | |
88 | * + A received packet is processed and handed to the kernel network stack, | |
89 | * detached from the iwl->rxq. The driver 'processed' index is updated. | |
90 | * + The Host/Firmware iwl->rxq is replenished at tasklet time from the rx_free | |
91 | * list. If there are no allocated buffers in iwl->rxq->rx_free, the READ | |
92 | * INDEX is not incremented and iwl->status(RX_STALLED) is set. If there | |
93 | * were enough free buffers and RX_STALLED is set it is cleared. | |
94 | * | |
95 | * | |
96 | * Driver sequence: | |
97 | * | |
98 | * iwl_rx_queue_alloc() Allocates rx_free | |
99 | * iwl_rx_replenish() Replenishes rx_free list from rx_used, and calls | |
100 | * iwl_rx_queue_restock | |
101 | * iwl_rx_queue_restock() Moves available buffers from rx_free into Rx | |
102 | * queue, updates firmware pointers, and updates | |
103 | * the WRITE index. If insufficient rx_free buffers | |
104 | * are available, schedules iwl_rx_replenish | |
105 | * | |
106 | * -- enable interrupts -- | |
107 | * ISR - iwl_rx() Detach iwl_rx_mem_buffers from pool up to the | |
108 | * READ INDEX, detaching the SKB from the pool. | |
109 | * Moves the packet buffer from queue to rx_used. | |
110 | * Calls iwl_rx_queue_restock to refill any empty | |
111 | * slots. | |
112 | * ... | |
113 | * | |
114 | */ | |
115 | ||
116 | /** | |
117 | * iwl_rx_queue_space - Return number of free slots available in queue. | |
118 | */ | |
119 | int iwl_rx_queue_space(const struct iwl_rx_queue *q) | |
120 | { | |
121 | int s = q->read - q->write; | |
122 | if (s <= 0) | |
123 | s += RX_QUEUE_SIZE; | |
124 | /* keep some buffer to not confuse full and empty queue */ | |
125 | s -= 2; | |
126 | if (s < 0) | |
127 | s = 0; | |
128 | return s; | |
129 | } | |
a55360e4 TW |
130 | |
131 | /** | |
132 | * iwl_rx_queue_update_write_ptr - Update the write pointer for the RX queue | |
133 | */ | |
7bfedc59 | 134 | void iwl_rx_queue_update_write_ptr(struct iwl_priv *priv, struct iwl_rx_queue *q) |
a55360e4 | 135 | { |
a55360e4 | 136 | unsigned long flags; |
141c43a3 | 137 | u32 reg; |
a55360e4 TW |
138 | |
139 | spin_lock_irqsave(&q->lock, flags); | |
140 | ||
141 | if (q->need_update == 0) | |
142 | goto exit_unlock; | |
143 | ||
f81c1f48 WYG |
144 | if (priv->cfg->base_params->shadow_reg_enable) { |
145 | /* shadow register enabled */ | |
a55360e4 | 146 | /* Device expects a multiple of 8 */ |
4752c93c | 147 | q->write_actual = (q->write & ~0x7); |
252e735d | 148 | iwl_write32(priv, FH_RSCSR_CHNL0_WPTR, q->write_actual); |
f81c1f48 WYG |
149 | } else { |
150 | /* If power-saving is in use, make sure device is awake */ | |
151 | if (test_bit(STATUS_POWER_PMI, &priv->status)) { | |
152 | reg = iwl_read32(priv, CSR_UCODE_DRV_GP1); | |
153 | ||
154 | if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) { | |
155 | IWL_DEBUG_INFO(priv, | |
156 | "Rx queue requesting wakeup," | |
157 | " GP1 = 0x%x\n", reg); | |
158 | iwl_set_bit(priv, CSR_GP_CNTRL, | |
159 | CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ); | |
160 | goto exit_unlock; | |
161 | } | |
162 | ||
163 | q->write_actual = (q->write & ~0x7); | |
252e735d | 164 | iwl_write_direct32(priv, FH_RSCSR_CHNL0_WPTR, |
f81c1f48 WYG |
165 | q->write_actual); |
166 | ||
167 | /* Else device is assumed to be awake */ | |
168 | } else { | |
169 | /* Device expects a multiple of 8 */ | |
170 | q->write_actual = (q->write & ~0x7); | |
252e735d | 171 | iwl_write_direct32(priv, FH_RSCSR_CHNL0_WPTR, |
f81c1f48 WYG |
172 | q->write_actual); |
173 | } | |
141c43a3 | 174 | } |
a55360e4 TW |
175 | q->need_update = 0; |
176 | ||
177 | exit_unlock: | |
178 | spin_unlock_irqrestore(&q->lock, flags); | |
a55360e4 | 179 | } |
a55360e4 | 180 | |
466a19a0 SG |
181 | /****************************************************************************** |
182 | * | |
183 | * Generic RX handler implementations | |
184 | * | |
185 | ******************************************************************************/ | |
186 | ||
466a19a0 SG |
187 | static void iwl_rx_reply_error(struct iwl_priv *priv, |
188 | struct iwl_rx_mem_buffer *rxb) | |
189 | { | |
190 | struct iwl_rx_packet *pkt = rxb_addr(rxb); | |
191 | ||
192 | IWL_ERR(priv, "Error Reply type 0x%08X cmd %s (0x%02X) " | |
193 | "seq 0x%04X ser 0x%08X\n", | |
194 | le32_to_cpu(pkt->u.err_resp.error_type), | |
195 | get_cmd_string(pkt->u.err_resp.cmd_id), | |
196 | pkt->u.err_resp.cmd_id, | |
197 | le16_to_cpu(pkt->u.err_resp.bad_cmd_seq_num), | |
198 | le32_to_cpu(pkt->u.err_resp.error_info)); | |
199 | } | |
200 | ||
201 | static void iwl_rx_csa(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb) | |
202 | { | |
203 | struct iwl_rx_packet *pkt = rxb_addr(rxb); | |
204 | struct iwl_csa_notification *csa = &(pkt->u.csa_notif); | |
205 | /* | |
206 | * MULTI-FIXME | |
207 | * See iwl_mac_channel_switch. | |
208 | */ | |
209 | struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS]; | |
210 | struct iwl_rxon_cmd *rxon = (void *)&ctx->active; | |
211 | ||
6f213ff1 SG |
212 | if (!test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status)) |
213 | return; | |
214 | ||
215 | if (!le32_to_cpu(csa->status) && csa->channel == priv->switch_channel) { | |
216 | rxon->channel = csa->channel; | |
217 | ctx->staging.channel = csa->channel; | |
218 | IWL_DEBUG_11H(priv, "CSA notif: channel %d\n", | |
466a19a0 | 219 | le16_to_cpu(csa->channel)); |
6f213ff1 SG |
220 | iwl_chswitch_done(priv, true); |
221 | } else { | |
222 | IWL_ERR(priv, "CSA notif (fail) : channel %d\n", | |
223 | le16_to_cpu(csa->channel)); | |
224 | iwl_chswitch_done(priv, false); | |
466a19a0 SG |
225 | } |
226 | } | |
227 | ||
228 | ||
229 | static void iwl_rx_spectrum_measure_notif(struct iwl_priv *priv, | |
81963d68 RC |
230 | struct iwl_rx_mem_buffer *rxb) |
231 | { | |
232 | struct iwl_rx_packet *pkt = rxb_addr(rxb); | |
233 | struct iwl_spectrum_notification *report = &(pkt->u.spectrum_notif); | |
234 | ||
235 | if (!report->state) { | |
236 | IWL_DEBUG_11H(priv, | |
237 | "Spectrum Measure Notification: Start\n"); | |
238 | return; | |
239 | } | |
240 | ||
241 | memcpy(&priv->measure_report, report, sizeof(*report)); | |
242 | priv->measurement_status |= MEASUREMENT_READY; | |
243 | } | |
81963d68 | 244 | |
466a19a0 SG |
245 | static void iwl_rx_pm_sleep_notif(struct iwl_priv *priv, |
246 | struct iwl_rx_mem_buffer *rxb) | |
247 | { | |
248 | #ifdef CONFIG_IWLWIFI_DEBUG | |
249 | struct iwl_rx_packet *pkt = rxb_addr(rxb); | |
250 | struct iwl_sleep_notification *sleep = &(pkt->u.sleep_notif); | |
251 | IWL_DEBUG_RX(priv, "sleep mode: %d, src: %d\n", | |
252 | sleep->pm_sleep_mode, sleep->pm_wakeup_src); | |
253 | #endif | |
254 | } | |
255 | ||
256 | static void iwl_rx_pm_debug_statistics_notif(struct iwl_priv *priv, | |
257 | struct iwl_rx_mem_buffer *rxb) | |
258 | { | |
259 | struct iwl_rx_packet *pkt = rxb_addr(rxb); | |
260 | u32 len = le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK; | |
261 | IWL_DEBUG_RADIO(priv, "Dumping %d bytes of unhandled " | |
262 | "notification for %s:\n", len, | |
263 | get_cmd_string(pkt->hdr.cmd)); | |
264 | iwl_print_hex_dump(priv, IWL_DL_RADIO, pkt->u.raw, len); | |
265 | } | |
266 | ||
267 | static void iwl_rx_beacon_notif(struct iwl_priv *priv, | |
268 | struct iwl_rx_mem_buffer *rxb) | |
269 | { | |
270 | struct iwl_rx_packet *pkt = rxb_addr(rxb); | |
271 | struct iwlagn_beacon_notif *beacon = (void *)pkt->u.raw; | |
272 | #ifdef CONFIG_IWLWIFI_DEBUG | |
273 | u16 status = le16_to_cpu(beacon->beacon_notify_hdr.status.status); | |
274 | u8 rate = iwl_hw_get_rate(beacon->beacon_notify_hdr.rate_n_flags); | |
275 | ||
276 | IWL_DEBUG_RX(priv, "beacon status %#x, retries:%d ibssmgr:%d " | |
277 | "tsf:0x%.8x%.8x rate:%d\n", | |
278 | status & TX_STATUS_MSK, | |
279 | beacon->beacon_notify_hdr.failure_frame, | |
280 | le32_to_cpu(beacon->ibss_mgr_status), | |
281 | le32_to_cpu(beacon->high_tsf), | |
282 | le32_to_cpu(beacon->low_tsf), rate); | |
283 | #endif | |
284 | ||
285 | priv->ibss_manager = le32_to_cpu(beacon->ibss_mgr_status); | |
286 | ||
287 | if (!test_bit(STATUS_EXIT_PENDING, &priv->status)) | |
288 | queue_work(priv->workqueue, &priv->beacon_update); | |
289 | } | |
290 | ||
ad6e82a5 SG |
291 | /* the threshold ratio of actual_ack_cnt to expected_ack_cnt in percent */ |
292 | #define ACK_CNT_RATIO (50) | |
293 | #define BA_TIMEOUT_CNT (5) | |
294 | #define BA_TIMEOUT_MAX (16) | |
295 | ||
296 | /** | |
297 | * iwl_good_ack_health - checks for ACK count ratios, BA timeout retries. | |
298 | * | |
299 | * When the ACK count ratio is low and aggregated BA timeout retries exceeding | |
300 | * the BA_TIMEOUT_MAX, reload firmware and bring system back to normal | |
301 | * operation state. | |
302 | */ | |
0da0e5bf JB |
303 | static bool iwl_good_ack_health(struct iwl_priv *priv, |
304 | struct statistics_tx *cur) | |
ad6e82a5 SG |
305 | { |
306 | int actual_delta, expected_delta, ba_timeout_delta; | |
0da0e5bf | 307 | struct statistics_tx *old; |
ad6e82a5 SG |
308 | |
309 | if (priv->_agn.agg_tids_count) | |
310 | return true; | |
311 | ||
0da0e5bf | 312 | old = &priv->statistics.tx; |
ad6e82a5 SG |
313 | |
314 | actual_delta = le32_to_cpu(cur->actual_ack_cnt) - | |
315 | le32_to_cpu(old->actual_ack_cnt); | |
316 | expected_delta = le32_to_cpu(cur->expected_ack_cnt) - | |
317 | le32_to_cpu(old->expected_ack_cnt); | |
318 | ||
319 | /* Values should not be negative, but we do not trust the firmware */ | |
320 | if (actual_delta <= 0 || expected_delta <= 0) | |
321 | return true; | |
322 | ||
323 | ba_timeout_delta = le32_to_cpu(cur->agg.ba_timeout) - | |
324 | le32_to_cpu(old->agg.ba_timeout); | |
325 | ||
326 | if ((actual_delta * 100 / expected_delta) < ACK_CNT_RATIO && | |
327 | ba_timeout_delta > BA_TIMEOUT_CNT) { | |
328 | IWL_DEBUG_RADIO(priv, "deltas: actual %d expected %d ba_timeout %d\n", | |
329 | actual_delta, expected_delta, ba_timeout_delta); | |
330 | ||
331 | #ifdef CONFIG_IWLWIFI_DEBUGFS | |
332 | /* | |
333 | * This is ifdef'ed on DEBUGFS because otherwise the | |
334 | * statistics aren't available. If DEBUGFS is set but | |
335 | * DEBUG is not, these will just compile out. | |
336 | */ | |
337 | IWL_DEBUG_RADIO(priv, "rx_detected_cnt delta %d\n", | |
0da0e5bf | 338 | priv->delta_stats.tx.rx_detected_cnt); |
ad6e82a5 SG |
339 | IWL_DEBUG_RADIO(priv, |
340 | "ack_or_ba_timeout_collision delta %d\n", | |
0da0e5bf | 341 | priv->delta_stats.tx.ack_or_ba_timeout_collision); |
ad6e82a5 SG |
342 | #endif |
343 | ||
344 | if (ba_timeout_delta >= BA_TIMEOUT_MAX) | |
345 | return false; | |
346 | } | |
347 | ||
348 | return true; | |
349 | } | |
350 | ||
351 | /** | |
352 | * iwl_good_plcp_health - checks for plcp error. | |
353 | * | |
354 | * When the plcp error is exceeding the thresholds, reset the radio | |
355 | * to improve the throughput. | |
356 | */ | |
466a19a0 | 357 | static bool iwl_good_plcp_health(struct iwl_priv *priv, |
0da0e5bf JB |
358 | struct statistics_rx_phy *cur_ofdm, |
359 | struct statistics_rx_ht_phy *cur_ofdm_ht, | |
360 | unsigned int msecs) | |
ad6e82a5 | 361 | { |
6198c387 SG |
362 | int delta; |
363 | int threshold = priv->cfg->base_params->plcp_delta_threshold; | |
ad6e82a5 | 364 | |
6198c387 | 365 | if (threshold == IWL_MAX_PLCP_ERR_THRESHOLD_DISABLE) { |
ad6e82a5 | 366 | IWL_DEBUG_RADIO(priv, "plcp_err check disabled\n"); |
6198c387 | 367 | return true; |
ad6e82a5 SG |
368 | } |
369 | ||
0da0e5bf JB |
370 | delta = le32_to_cpu(cur_ofdm->plcp_err) - |
371 | le32_to_cpu(priv->statistics.rx_ofdm.plcp_err) + | |
372 | le32_to_cpu(cur_ofdm_ht->plcp_err) - | |
373 | le32_to_cpu(priv->statistics.rx_ofdm_ht.plcp_err); | |
6198c387 | 374 | |
0da0e5bf | 375 | /* Can be negative if firmware reset statistics */ |
6198c387 SG |
376 | if (delta <= 0) |
377 | return true; | |
378 | ||
379 | if ((delta * 100 / msecs) > threshold) { | |
380 | IWL_DEBUG_RADIO(priv, | |
381 | "plcp health threshold %u delta %d msecs %u\n", | |
382 | threshold, delta, msecs); | |
383 | return false; | |
384 | } | |
385 | ||
386 | return true; | |
ad6e82a5 SG |
387 | } |
388 | ||
466a19a0 | 389 | static void iwl_recover_from_statistics(struct iwl_priv *priv, |
0da0e5bf JB |
390 | struct statistics_rx_phy *cur_ofdm, |
391 | struct statistics_rx_ht_phy *cur_ofdm_ht, | |
392 | struct statistics_tx *tx, | |
393 | unsigned long stamp) | |
fa8f130c | 394 | { |
410f2bb3 | 395 | unsigned int msecs; |
b7977ffa | 396 | |
410f2bb3 SG |
397 | if (test_bit(STATUS_EXIT_PENDING, &priv->status)) |
398 | return; | |
399 | ||
410f2bb3 SG |
400 | msecs = jiffies_to_msecs(stamp - priv->rx_statistics_jiffies); |
401 | ||
402 | /* Only gather statistics and update time stamp when not associated */ | |
403 | if (!iwl_is_any_associated(priv)) | |
0da0e5bf | 404 | return; |
410f2bb3 SG |
405 | |
406 | /* Do not check/recover when do not have enough statistics data */ | |
407 | if (msecs < 99) | |
fa8f130c | 408 | return; |
ca3d9389 | 409 | |
9d143e9a | 410 | if (iwlagn_mod_params.ack_check && !iwl_good_ack_health(priv, tx)) { |
ca3d9389 SG |
411 | IWL_ERR(priv, "low ack count detected, restart firmware\n"); |
412 | if (!iwl_force_reset(priv, IWL_FW_RESET, false)) | |
413 | return; | |
3e4fb5fa | 414 | } |
ca3d9389 | 415 | |
9d143e9a | 416 | if (iwlagn_mod_params.plcp_check && |
0da0e5bf | 417 | !iwl_good_plcp_health(priv, cur_ofdm, cur_ofdm_ht, msecs)) |
ca3d9389 | 418 | iwl_force_reset(priv, IWL_RF_RESET, false); |
beac5498 | 419 | } |
beac5498 | 420 | |
67289941 SG |
421 | /* Calculate noise level, based on measurements during network silence just |
422 | * before arriving beacon. This measurement can be done only if we know | |
423 | * exactly when to expect beacons, therefore only when we're associated. */ | |
424 | static void iwl_rx_calc_noise(struct iwl_priv *priv) | |
425 | { | |
426 | struct statistics_rx_non_phy *rx_info; | |
427 | int num_active_rx = 0; | |
428 | int total_silence = 0; | |
429 | int bcn_silence_a, bcn_silence_b, bcn_silence_c; | |
430 | int last_rx_noise; | |
431 | ||
0da0e5bf JB |
432 | rx_info = &priv->statistics.rx_non_phy; |
433 | ||
67289941 SG |
434 | bcn_silence_a = |
435 | le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER; | |
436 | bcn_silence_b = | |
437 | le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER; | |
438 | bcn_silence_c = | |
439 | le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER; | |
440 | ||
441 | if (bcn_silence_a) { | |
442 | total_silence += bcn_silence_a; | |
443 | num_active_rx++; | |
444 | } | |
445 | if (bcn_silence_b) { | |
446 | total_silence += bcn_silence_b; | |
447 | num_active_rx++; | |
448 | } | |
449 | if (bcn_silence_c) { | |
450 | total_silence += bcn_silence_c; | |
451 | num_active_rx++; | |
452 | } | |
453 | ||
454 | /* Average among active antennas */ | |
455 | if (num_active_rx) | |
456 | last_rx_noise = (total_silence / num_active_rx) - 107; | |
457 | else | |
458 | last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE; | |
459 | ||
460 | IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n", | |
461 | bcn_silence_a, bcn_silence_b, bcn_silence_c, | |
462 | last_rx_noise); | |
463 | } | |
464 | ||
0da0e5bf | 465 | #ifdef CONFIG_IWLWIFI_DEBUGFS |
67289941 SG |
466 | /* |
467 | * based on the assumption of all statistics counter are in DWORD | |
468 | * FIXME: This function is for debugging, do not deal with | |
469 | * the case of counters roll-over. | |
470 | */ | |
0da0e5bf JB |
471 | static void accum_stats(__le32 *prev, __le32 *cur, __le32 *delta, |
472 | __le32 *max_delta, __le32 *accum, int size) | |
67289941 | 473 | { |
0da0e5bf JB |
474 | int i; |
475 | ||
476 | for (i = 0; | |
477 | i < size / sizeof(__le32); | |
478 | i++, prev++, cur++, delta++, max_delta++, accum++) { | |
479 | if (le32_to_cpu(*cur) > le32_to_cpu(*prev)) { | |
480 | *delta = cpu_to_le32( | |
481 | le32_to_cpu(*cur) - le32_to_cpu(*prev)); | |
482 | le32_add_cpu(accum, le32_to_cpu(*delta)); | |
483 | if (le32_to_cpu(*delta) > le32_to_cpu(*max_delta)) | |
67289941 SG |
484 | *max_delta = *delta; |
485 | } | |
486 | } | |
0da0e5bf | 487 | } |
67289941 | 488 | |
0da0e5bf JB |
489 | static void |
490 | iwl_accumulative_statistics(struct iwl_priv *priv, | |
491 | struct statistics_general_common *common, | |
492 | struct statistics_rx_non_phy *rx_non_phy, | |
493 | struct statistics_rx_phy *rx_ofdm, | |
494 | struct statistics_rx_ht_phy *rx_ofdm_ht, | |
495 | struct statistics_rx_phy *rx_cck, | |
496 | struct statistics_tx *tx, | |
497 | struct statistics_bt_activity *bt_activity) | |
498 | { | |
499 | #define ACCUM(_name) \ | |
500 | accum_stats((__le32 *)&priv->statistics._name, \ | |
501 | (__le32 *)_name, \ | |
502 | (__le32 *)&priv->delta_stats._name, \ | |
503 | (__le32 *)&priv->max_delta_stats._name, \ | |
504 | (__le32 *)&priv->accum_stats._name, \ | |
505 | sizeof(*_name)); | |
506 | ||
507 | ACCUM(common); | |
508 | ACCUM(rx_non_phy); | |
509 | ACCUM(rx_ofdm); | |
510 | ACCUM(rx_ofdm_ht); | |
511 | ACCUM(rx_cck); | |
512 | ACCUM(tx); | |
513 | if (bt_activity) | |
514 | ACCUM(bt_activity); | |
515 | #undef ACCUM | |
466a19a0 | 516 | } |
0da0e5bf JB |
517 | #else |
518 | static inline void | |
519 | iwl_accumulative_statistics(struct iwl_priv *priv, | |
520 | struct statistics_general_common *common, | |
521 | struct statistics_rx_non_phy *rx_non_phy, | |
522 | struct statistics_rx_phy *rx_ofdm, | |
523 | struct statistics_rx_ht_phy *rx_ofdm_ht, | |
524 | struct statistics_rx_phy *rx_cck, | |
525 | struct statistics_tx *tx, | |
526 | struct statistics_bt_activity *bt_activity) | |
527 | { | |
528 | } | |
529 | #endif | |
67289941 | 530 | |
466a19a0 | 531 | static void iwl_rx_statistics(struct iwl_priv *priv, |
67289941 SG |
532 | struct iwl_rx_mem_buffer *rxb) |
533 | { | |
0da0e5bf | 534 | unsigned long stamp = jiffies; |
466a19a0 | 535 | const int reg_recalib_period = 60; |
67289941 SG |
536 | int change; |
537 | struct iwl_rx_packet *pkt = rxb_addr(rxb); | |
0da0e5bf JB |
538 | u32 len = le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK; |
539 | __le32 *flag; | |
540 | struct statistics_general_common *common; | |
541 | struct statistics_rx_non_phy *rx_non_phy; | |
542 | struct statistics_rx_phy *rx_ofdm; | |
543 | struct statistics_rx_ht_phy *rx_ofdm_ht; | |
544 | struct statistics_rx_phy *rx_cck; | |
545 | struct statistics_tx *tx; | |
546 | struct statistics_bt_activity *bt_activity; | |
547 | ||
548 | len -= sizeof(struct iwl_cmd_header); /* skip header */ | |
549 | ||
550 | IWL_DEBUG_RX(priv, "Statistics notification received (%d bytes).\n", | |
551 | len); | |
552 | ||
553 | if (len == sizeof(struct iwl_bt_notif_statistics)) { | |
554 | struct iwl_bt_notif_statistics *stats; | |
555 | stats = &pkt->u.stats_bt; | |
556 | flag = &stats->flag; | |
557 | common = &stats->general.common; | |
558 | rx_non_phy = &stats->rx.general.common; | |
559 | rx_ofdm = &stats->rx.ofdm; | |
560 | rx_ofdm_ht = &stats->rx.ofdm_ht; | |
561 | rx_cck = &stats->rx.cck; | |
562 | tx = &stats->tx; | |
563 | bt_activity = &stats->general.activity; | |
67289941 | 564 | |
0da0e5bf JB |
565 | #ifdef CONFIG_IWLWIFI_DEBUGFS |
566 | /* handle this exception directly */ | |
567 | priv->statistics.num_bt_kills = stats->rx.general.num_bt_kills; | |
568 | le32_add_cpu(&priv->statistics.accum_num_bt_kills, | |
569 | le32_to_cpu(stats->rx.general.num_bt_kills)); | |
570 | #endif | |
571 | } else if (len == sizeof(struct iwl_notif_statistics)) { | |
572 | struct iwl_notif_statistics *stats; | |
573 | stats = &pkt->u.stats; | |
574 | flag = &stats->flag; | |
575 | common = &stats->general.common; | |
576 | rx_non_phy = &stats->rx.general; | |
577 | rx_ofdm = &stats->rx.ofdm; | |
578 | rx_ofdm_ht = &stats->rx.ofdm_ht; | |
579 | rx_cck = &stats->rx.cck; | |
580 | tx = &stats->tx; | |
581 | bt_activity = NULL; | |
67289941 | 582 | } else { |
0da0e5bf JB |
583 | WARN_ONCE(1, "len %d doesn't match BT (%zu) or normal (%zu)\n", |
584 | len, sizeof(struct iwl_bt_notif_statistics), | |
585 | sizeof(struct iwl_notif_statistics)); | |
586 | return; | |
67289941 SG |
587 | } |
588 | ||
0da0e5bf JB |
589 | change = common->temperature != priv->statistics.common.temperature || |
590 | (*flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK) != | |
591 | (priv->statistics.flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK); | |
592 | ||
593 | iwl_accumulative_statistics(priv, common, rx_non_phy, rx_ofdm, | |
594 | rx_ofdm_ht, rx_cck, tx, bt_activity); | |
595 | ||
596 | iwl_recover_from_statistics(priv, rx_ofdm, rx_ofdm_ht, tx, stamp); | |
597 | ||
598 | priv->statistics.flag = *flag; | |
599 | memcpy(&priv->statistics.common, common, sizeof(*common)); | |
600 | memcpy(&priv->statistics.rx_non_phy, rx_non_phy, sizeof(*rx_non_phy)); | |
601 | memcpy(&priv->statistics.rx_ofdm, rx_ofdm, sizeof(*rx_ofdm)); | |
602 | memcpy(&priv->statistics.rx_ofdm_ht, rx_ofdm_ht, sizeof(*rx_ofdm_ht)); | |
603 | memcpy(&priv->statistics.rx_cck, rx_cck, sizeof(*rx_cck)); | |
604 | memcpy(&priv->statistics.tx, tx, sizeof(*tx)); | |
605 | #ifdef CONFIG_IWLWIFI_DEBUGFS | |
606 | if (bt_activity) | |
607 | memcpy(&priv->statistics.bt_activity, bt_activity, | |
608 | sizeof(*bt_activity)); | |
609 | #endif | |
610 | ||
611 | priv->rx_statistics_jiffies = stamp; | |
67289941 | 612 | |
67289941 SG |
613 | set_bit(STATUS_STATISTICS, &priv->status); |
614 | ||
615 | /* Reschedule the statistics timer to occur in | |
466a19a0 | 616 | * reg_recalib_period seconds to ensure we get a |
67289941 SG |
617 | * thermal update even if the uCode doesn't give |
618 | * us one */ | |
619 | mod_timer(&priv->statistics_periodic, jiffies + | |
466a19a0 | 620 | msecs_to_jiffies(reg_recalib_period * 1000)); |
67289941 SG |
621 | |
622 | if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) && | |
623 | (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) { | |
624 | iwl_rx_calc_noise(priv); | |
625 | queue_work(priv->workqueue, &priv->run_time_calib_work); | |
626 | } | |
627 | if (priv->cfg->ops->lib->temp_ops.temperature && change) | |
628 | priv->cfg->ops->lib->temp_ops.temperature(priv); | |
629 | } | |
630 | ||
466a19a0 SG |
631 | static void iwl_rx_reply_statistics(struct iwl_priv *priv, |
632 | struct iwl_rx_mem_buffer *rxb) | |
67289941 SG |
633 | { |
634 | struct iwl_rx_packet *pkt = rxb_addr(rxb); | |
635 | ||
636 | if (le32_to_cpu(pkt->u.stats.flag) & UCODE_STATISTICS_CLEAR_MSK) { | |
637 | #ifdef CONFIG_IWLWIFI_DEBUGFS | |
0da0e5bf JB |
638 | memset(&priv->accum_stats, 0, |
639 | sizeof(priv->accum_stats)); | |
640 | memset(&priv->delta_stats, 0, | |
641 | sizeof(priv->delta_stats)); | |
642 | memset(&priv->max_delta_stats, 0, | |
643 | sizeof(priv->max_delta_stats)); | |
67289941 SG |
644 | #endif |
645 | IWL_DEBUG_RX(priv, "Statistics have been cleared\n"); | |
646 | } | |
647 | iwl_rx_statistics(priv, rxb); | |
648 | } | |
649 | ||
466a19a0 SG |
650 | /* Handle notification from uCode that card's power state is changing |
651 | * due to software, hardware, or critical temperature RFKILL */ | |
652 | static void iwl_rx_card_state_notif(struct iwl_priv *priv, | |
653 | struct iwl_rx_mem_buffer *rxb) | |
654 | { | |
655 | struct iwl_rx_packet *pkt = rxb_addr(rxb); | |
656 | u32 flags = le32_to_cpu(pkt->u.card_state_notif.flags); | |
657 | unsigned long status = priv->status; | |
658 | ||
659 | IWL_DEBUG_RF_KILL(priv, "Card state received: HW:%s SW:%s CT:%s\n", | |
660 | (flags & HW_CARD_DISABLED) ? "Kill" : "On", | |
661 | (flags & SW_CARD_DISABLED) ? "Kill" : "On", | |
662 | (flags & CT_CARD_DISABLED) ? | |
663 | "Reached" : "Not reached"); | |
664 | ||
665 | if (flags & (SW_CARD_DISABLED | HW_CARD_DISABLED | | |
666 | CT_CARD_DISABLED)) { | |
667 | ||
668 | iwl_write32(priv, CSR_UCODE_DRV_GP1_SET, | |
669 | CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED); | |
670 | ||
671 | iwl_write_direct32(priv, HBUS_TARG_MBX_C, | |
672 | HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED); | |
673 | ||
674 | if (!(flags & RXON_CARD_DISABLED)) { | |
675 | iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR, | |
676 | CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED); | |
677 | iwl_write_direct32(priv, HBUS_TARG_MBX_C, | |
678 | HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED); | |
679 | } | |
680 | if (flags & CT_CARD_DISABLED) | |
681 | iwl_tt_enter_ct_kill(priv); | |
682 | } | |
683 | if (!(flags & CT_CARD_DISABLED)) | |
684 | iwl_tt_exit_ct_kill(priv); | |
685 | ||
686 | if (flags & HW_CARD_DISABLED) | |
687 | set_bit(STATUS_RF_KILL_HW, &priv->status); | |
688 | else | |
689 | clear_bit(STATUS_RF_KILL_HW, &priv->status); | |
690 | ||
691 | ||
692 | if (!(flags & RXON_CARD_DISABLED)) | |
693 | iwl_scan_cancel(priv); | |
694 | ||
695 | if ((test_bit(STATUS_RF_KILL_HW, &status) != | |
696 | test_bit(STATUS_RF_KILL_HW, &priv->status))) | |
697 | wiphy_rfkill_set_hw_state(priv->hw->wiphy, | |
698 | test_bit(STATUS_RF_KILL_HW, &priv->status)); | |
699 | else | |
700 | wake_up_interruptible(&priv->wait_command_queue); | |
701 | } | |
702 | ||
703 | static void iwl_rx_missed_beacon_notif(struct iwl_priv *priv, | |
704 | struct iwl_rx_mem_buffer *rxb) | |
67289941 SG |
705 | |
706 | { | |
707 | struct iwl_rx_packet *pkt = rxb_addr(rxb); | |
708 | struct iwl_missed_beacon_notif *missed_beacon; | |
709 | ||
710 | missed_beacon = &pkt->u.missed_beacon; | |
711 | if (le32_to_cpu(missed_beacon->consecutive_missed_beacons) > | |
712 | priv->missed_beacon_threshold) { | |
713 | IWL_DEBUG_CALIB(priv, | |
714 | "missed bcn cnsq %d totl %d rcd %d expctd %d\n", | |
715 | le32_to_cpu(missed_beacon->consecutive_missed_beacons), | |
716 | le32_to_cpu(missed_beacon->total_missed_becons), | |
717 | le32_to_cpu(missed_beacon->num_recvd_beacons), | |
718 | le32_to_cpu(missed_beacon->num_expected_beacons)); | |
719 | if (!test_bit(STATUS_SCANNING, &priv->status)) | |
720 | iwl_init_sensitivity(priv); | |
721 | } | |
722 | } | |
723 | ||
466a19a0 SG |
724 | /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD). |
725 | * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */ | |
726 | static void iwl_rx_reply_rx_phy(struct iwl_priv *priv, | |
727 | struct iwl_rx_mem_buffer *rxb) | |
728 | { | |
729 | struct iwl_rx_packet *pkt = rxb_addr(rxb); | |
730 | ||
731 | priv->_agn.last_phy_res_valid = true; | |
732 | memcpy(&priv->_agn.last_phy_res, pkt->u.raw, | |
733 | sizeof(struct iwl_rx_phy_res)); | |
734 | } | |
735 | ||
1781a07f EG |
736 | /* |
737 | * returns non-zero if packet should be dropped | |
738 | */ | |
466a19a0 SG |
739 | static int iwl_set_decrypted_flag(struct iwl_priv *priv, |
740 | struct ieee80211_hdr *hdr, | |
741 | u32 decrypt_res, | |
742 | struct ieee80211_rx_status *stats) | |
1781a07f EG |
743 | { |
744 | u16 fc = le16_to_cpu(hdr->frame_control); | |
745 | ||
246ed355 JB |
746 | /* |
747 | * All contexts have the same setting here due to it being | |
748 | * a module parameter, so OK to check any context. | |
749 | */ | |
750 | if (priv->contexts[IWL_RXON_CTX_BSS].active.filter_flags & | |
751 | RXON_FILTER_DIS_DECRYPT_MSK) | |
1781a07f EG |
752 | return 0; |
753 | ||
754 | if (!(fc & IEEE80211_FCTL_PROTECTED)) | |
755 | return 0; | |
756 | ||
e1623446 | 757 | IWL_DEBUG_RX(priv, "decrypt_res:0x%x\n", decrypt_res); |
1781a07f EG |
758 | switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) { |
759 | case RX_RES_STATUS_SEC_TYPE_TKIP: | |
760 | /* The uCode has got a bad phase 1 Key, pushes the packet. | |
761 | * Decryption will be done in SW. */ | |
762 | if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) == | |
763 | RX_RES_STATUS_BAD_KEY_TTAK) | |
764 | break; | |
765 | ||
766 | case RX_RES_STATUS_SEC_TYPE_WEP: | |
767 | if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) == | |
768 | RX_RES_STATUS_BAD_ICV_MIC) { | |
769 | /* bad ICV, the packet is destroyed since the | |
770 | * decryption is inplace, drop it */ | |
e1623446 | 771 | IWL_DEBUG_RX(priv, "Packet destroyed\n"); |
1781a07f EG |
772 | return -1; |
773 | } | |
774 | case RX_RES_STATUS_SEC_TYPE_CCMP: | |
775 | if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) == | |
776 | RX_RES_STATUS_DECRYPT_OK) { | |
e1623446 | 777 | IWL_DEBUG_RX(priv, "hw decrypt successfully!!!\n"); |
1781a07f EG |
778 | stats->flag |= RX_FLAG_DECRYPTED; |
779 | } | |
780 | break; | |
781 | ||
782 | default: | |
783 | break; | |
784 | } | |
785 | return 0; | |
786 | } | |
466a19a0 SG |
787 | |
788 | static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv, | |
789 | struct ieee80211_hdr *hdr, | |
790 | u16 len, | |
791 | u32 ampdu_status, | |
792 | struct iwl_rx_mem_buffer *rxb, | |
793 | struct ieee80211_rx_status *stats) | |
794 | { | |
795 | struct sk_buff *skb; | |
796 | __le16 fc = hdr->frame_control; | |
68b99311 | 797 | struct iwl_rxon_context *ctx; |
466a19a0 SG |
798 | |
799 | /* We only process data packets if the interface is open */ | |
800 | if (unlikely(!priv->is_open)) { | |
801 | IWL_DEBUG_DROP_LIMIT(priv, | |
802 | "Dropping packet while interface is not open.\n"); | |
803 | return; | |
804 | } | |
805 | ||
806 | /* In case of HW accelerated crypto and bad decryption, drop */ | |
9d143e9a | 807 | if (!iwlagn_mod_params.sw_crypto && |
466a19a0 SG |
808 | iwl_set_decrypted_flag(priv, hdr, ampdu_status, stats)) |
809 | return; | |
810 | ||
811 | skb = dev_alloc_skb(128); | |
812 | if (!skb) { | |
813 | IWL_ERR(priv, "dev_alloc_skb failed\n"); | |
814 | return; | |
815 | } | |
816 | ||
817 | skb_add_rx_frag(skb, 0, rxb->page, (void *)hdr - rxb_addr(rxb), len); | |
818 | ||
819 | iwl_update_stats(priv, false, fc, len); | |
68b99311 GT |
820 | |
821 | /* | |
822 | * Wake any queues that were stopped due to a passive channel tx | |
823 | * failure. This can happen because the regulatory enforcement in | |
824 | * the device waits for a beacon before allowing transmission, | |
825 | * sometimes even after already having transmitted frames for the | |
826 | * association because the new RXON may reset the information. | |
827 | */ | |
828 | if (unlikely(ieee80211_is_beacon(fc))) { | |
829 | for_each_context(priv, ctx) { | |
830 | if (!ctx->last_tx_rejected) | |
831 | continue; | |
832 | if (compare_ether_addr(hdr->addr3, | |
833 | ctx->active.bssid_addr)) | |
834 | continue; | |
835 | ctx->last_tx_rejected = false; | |
836 | iwl_wake_any_queue(priv, ctx); | |
837 | } | |
838 | } | |
839 | ||
466a19a0 SG |
840 | memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats)); |
841 | ||
842 | ieee80211_rx(priv->hw, skb); | |
466a19a0 SG |
843 | rxb->page = NULL; |
844 | } | |
845 | ||
846 | static u32 iwl_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in) | |
847 | { | |
848 | u32 decrypt_out = 0; | |
849 | ||
850 | if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) == | |
851 | RX_RES_STATUS_STATION_FOUND) | |
852 | decrypt_out |= (RX_RES_STATUS_STATION_FOUND | | |
853 | RX_RES_STATUS_NO_STATION_INFO_MISMATCH); | |
854 | ||
855 | decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK); | |
856 | ||
857 | /* packet was not encrypted */ | |
858 | if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) == | |
859 | RX_RES_STATUS_SEC_TYPE_NONE) | |
860 | return decrypt_out; | |
861 | ||
862 | /* packet was encrypted with unknown alg */ | |
863 | if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) == | |
864 | RX_RES_STATUS_SEC_TYPE_ERR) | |
865 | return decrypt_out; | |
866 | ||
867 | /* decryption was not done in HW */ | |
868 | if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) != | |
869 | RX_MPDU_RES_STATUS_DEC_DONE_MSK) | |
870 | return decrypt_out; | |
871 | ||
872 | switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) { | |
873 | ||
874 | case RX_RES_STATUS_SEC_TYPE_CCMP: | |
875 | /* alg is CCM: check MIC only */ | |
876 | if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK)) | |
877 | /* Bad MIC */ | |
878 | decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC; | |
879 | else | |
880 | decrypt_out |= RX_RES_STATUS_DECRYPT_OK; | |
881 | ||
882 | break; | |
883 | ||
884 | case RX_RES_STATUS_SEC_TYPE_TKIP: | |
885 | if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) { | |
886 | /* Bad TTAK */ | |
887 | decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK; | |
888 | break; | |
889 | } | |
890 | /* fall through if TTAK OK */ | |
891 | default: | |
892 | if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK)) | |
893 | decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC; | |
894 | else | |
895 | decrypt_out |= RX_RES_STATUS_DECRYPT_OK; | |
896 | break; | |
897 | } | |
898 | ||
899 | IWL_DEBUG_RX(priv, "decrypt_in:0x%x decrypt_out = 0x%x\n", | |
900 | decrypt_in, decrypt_out); | |
901 | ||
902 | return decrypt_out; | |
903 | } | |
904 | ||
905 | /* Called for REPLY_RX (legacy ABG frames), or | |
906 | * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */ | |
907 | static void iwl_rx_reply_rx(struct iwl_priv *priv, | |
908 | struct iwl_rx_mem_buffer *rxb) | |
909 | { | |
910 | struct ieee80211_hdr *header; | |
911 | struct ieee80211_rx_status rx_status; | |
912 | struct iwl_rx_packet *pkt = rxb_addr(rxb); | |
913 | struct iwl_rx_phy_res *phy_res; | |
914 | __le32 rx_pkt_status; | |
915 | struct iwl_rx_mpdu_res_start *amsdu; | |
916 | u32 len; | |
917 | u32 ampdu_status; | |
918 | u32 rate_n_flags; | |
919 | ||
920 | /** | |
921 | * REPLY_RX and REPLY_RX_MPDU_CMD are handled differently. | |
922 | * REPLY_RX: physical layer info is in this buffer | |
923 | * REPLY_RX_MPDU_CMD: physical layer info was sent in separate | |
924 | * command and cached in priv->last_phy_res | |
925 | * | |
926 | * Here we set up local variables depending on which command is | |
927 | * received. | |
928 | */ | |
929 | if (pkt->hdr.cmd == REPLY_RX) { | |
930 | phy_res = (struct iwl_rx_phy_res *)pkt->u.raw; | |
931 | header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*phy_res) | |
932 | + phy_res->cfg_phy_cnt); | |
933 | ||
934 | len = le16_to_cpu(phy_res->byte_count); | |
935 | rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*phy_res) + | |
936 | phy_res->cfg_phy_cnt + len); | |
937 | ampdu_status = le32_to_cpu(rx_pkt_status); | |
938 | } else { | |
939 | if (!priv->_agn.last_phy_res_valid) { | |
940 | IWL_ERR(priv, "MPDU frame without cached PHY data\n"); | |
941 | return; | |
942 | } | |
943 | phy_res = &priv->_agn.last_phy_res; | |
944 | amsdu = (struct iwl_rx_mpdu_res_start *)pkt->u.raw; | |
945 | header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*amsdu)); | |
946 | len = le16_to_cpu(amsdu->byte_count); | |
947 | rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*amsdu) + len); | |
948 | ampdu_status = iwl_translate_rx_status(priv, | |
949 | le32_to_cpu(rx_pkt_status)); | |
950 | } | |
951 | ||
952 | if ((unlikely(phy_res->cfg_phy_cnt > 20))) { | |
953 | IWL_DEBUG_DROP(priv, "dsp size out of range [0,20]: %d/n", | |
954 | phy_res->cfg_phy_cnt); | |
955 | return; | |
956 | } | |
957 | ||
958 | if (!(rx_pkt_status & RX_RES_STATUS_NO_CRC32_ERROR) || | |
959 | !(rx_pkt_status & RX_RES_STATUS_NO_RXE_OVERFLOW)) { | |
960 | IWL_DEBUG_RX(priv, "Bad CRC or FIFO: 0x%08X.\n", | |
961 | le32_to_cpu(rx_pkt_status)); | |
962 | return; | |
963 | } | |
964 | ||
965 | /* This will be used in several places later */ | |
966 | rate_n_flags = le32_to_cpu(phy_res->rate_n_flags); | |
967 | ||
968 | /* rx_status carries information about the packet to mac80211 */ | |
969 | rx_status.mactime = le64_to_cpu(phy_res->timestamp); | |
970 | rx_status.band = (phy_res->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ? | |
971 | IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ; | |
972 | rx_status.freq = | |
973 | ieee80211_channel_to_frequency(le16_to_cpu(phy_res->channel), | |
974 | rx_status.band); | |
975 | rx_status.rate_idx = | |
976 | iwlagn_hwrate_to_mac80211_idx(rate_n_flags, rx_status.band); | |
977 | rx_status.flag = 0; | |
978 | ||
979 | /* TSF isn't reliable. In order to allow smooth user experience, | |
980 | * this W/A doesn't propagate it to the mac80211 */ | |
981 | /*rx_status.flag |= RX_FLAG_MACTIME_MPDU;*/ | |
982 | ||
983 | priv->ucode_beacon_time = le32_to_cpu(phy_res->beacon_time_stamp); | |
984 | ||
985 | /* Find max signal strength (dBm) among 3 antenna/receiver chains */ | |
986 | rx_status.signal = priv->cfg->ops->utils->calc_rssi(priv, phy_res); | |
987 | ||
988 | iwl_dbg_log_rx_data_frame(priv, len, header); | |
989 | IWL_DEBUG_STATS_LIMIT(priv, "Rssi %d, TSF %llu\n", | |
990 | rx_status.signal, (unsigned long long)rx_status.mactime); | |
991 | ||
992 | /* | |
993 | * "antenna number" | |
994 | * | |
995 | * It seems that the antenna field in the phy flags value | |
996 | * is actually a bit field. This is undefined by radiotap, | |
997 | * it wants an actual antenna number but I always get "7" | |
998 | * for most legacy frames I receive indicating that the | |
999 | * same frame was received on all three RX chains. | |
1000 | * | |
1001 | * I think this field should be removed in favor of a | |
1002 | * new 802.11n radiotap field "RX chains" that is defined | |
1003 | * as a bitmask. | |
1004 | */ | |
1005 | rx_status.antenna = | |
1006 | (le16_to_cpu(phy_res->phy_flags) & RX_RES_PHY_FLAGS_ANTENNA_MSK) | |
1007 | >> RX_RES_PHY_FLAGS_ANTENNA_POS; | |
1008 | ||
1009 | /* set the preamble flag if appropriate */ | |
1010 | if (phy_res->phy_flags & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK) | |
1011 | rx_status.flag |= RX_FLAG_SHORTPRE; | |
1012 | ||
1013 | /* Set up the HT phy flags */ | |
1014 | if (rate_n_flags & RATE_MCS_HT_MSK) | |
1015 | rx_status.flag |= RX_FLAG_HT; | |
1016 | if (rate_n_flags & RATE_MCS_HT40_MSK) | |
1017 | rx_status.flag |= RX_FLAG_40MHZ; | |
1018 | if (rate_n_flags & RATE_MCS_SGI_MSK) | |
1019 | rx_status.flag |= RX_FLAG_SHORT_GI; | |
1020 | ||
1021 | iwl_pass_packet_to_mac80211(priv, header, len, ampdu_status, | |
1022 | rxb, &rx_status); | |
1023 | } | |
1024 | ||
1025 | /** | |
1026 | * iwl_setup_rx_handlers - Initialize Rx handler callbacks | |
1027 | * | |
1028 | * Setup the RX handlers for each of the reply types sent from the uCode | |
1029 | * to the host. | |
1030 | */ | |
1031 | void iwl_setup_rx_handlers(struct iwl_priv *priv) | |
1032 | { | |
1033 | void (**handlers)(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb); | |
1034 | ||
1035 | handlers = priv->rx_handlers; | |
1036 | ||
466a19a0 SG |
1037 | handlers[REPLY_ERROR] = iwl_rx_reply_error; |
1038 | handlers[CHANNEL_SWITCH_NOTIFICATION] = iwl_rx_csa; | |
1039 | handlers[SPECTRUM_MEASURE_NOTIFICATION] = iwl_rx_spectrum_measure_notif; | |
1040 | handlers[PM_SLEEP_NOTIFICATION] = iwl_rx_pm_sleep_notif; | |
1041 | handlers[PM_DEBUG_STATISTIC_NOTIFIC] = iwl_rx_pm_debug_statistics_notif; | |
1042 | handlers[BEACON_NOTIFICATION] = iwl_rx_beacon_notif; | |
1043 | ||
1044 | /* | |
1045 | * The same handler is used for both the REPLY to a discrete | |
1046 | * statistics request from the host as well as for the periodic | |
1047 | * statistics notifications (after received beacons) from the uCode. | |
1048 | */ | |
1049 | handlers[REPLY_STATISTICS_CMD] = iwl_rx_reply_statistics; | |
1050 | handlers[STATISTICS_NOTIFICATION] = iwl_rx_statistics; | |
1051 | ||
1052 | iwl_setup_rx_scan_handlers(priv); | |
1053 | ||
1054 | handlers[CARD_STATE_NOTIFICATION] = iwl_rx_card_state_notif; | |
1055 | handlers[MISSED_BEACONS_NOTIFICATION] = iwl_rx_missed_beacon_notif; | |
1056 | ||
1057 | /* Rx handlers */ | |
1058 | handlers[REPLY_RX_PHY_CMD] = iwl_rx_reply_rx_phy; | |
1059 | handlers[REPLY_RX_MPDU_CMD] = iwl_rx_reply_rx; | |
1060 | ||
1061 | /* block ack */ | |
1062 | handlers[REPLY_COMPRESSED_BA] = iwlagn_rx_reply_compressed_ba; | |
1063 | ||
1064 | /* Set up hardware specific Rx handlers */ | |
1065 | priv->cfg->ops->lib->rx_handler_setup(priv); | |
1066 | } |