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path: root/drivers/net/wireless/iwlwifi/iwl-rx.c
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Diffstat (limited to 'drivers/net/wireless/iwlwifi/iwl-rx.c')
-rw-r--r--drivers/net/wireless/iwlwifi/iwl-rx.c758
1 files changed, 4 insertions, 754 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-rx.c b/drivers/net/wireless/iwlwifi/iwl-rx.c
index d3b2fb389e58..267eb8935902 100644
--- a/drivers/net/wireless/iwlwifi/iwl-rx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-rx.c
@@ -163,197 +163,6 @@ void iwl_rx_queue_update_write_ptr(struct iwl_priv *priv, struct iwl_rx_queue *q
163 spin_unlock_irqrestore(&q->lock, flags); 163 spin_unlock_irqrestore(&q->lock, flags);
164} 164}
165EXPORT_SYMBOL(iwl_rx_queue_update_write_ptr); 165EXPORT_SYMBOL(iwl_rx_queue_update_write_ptr);
166/**
167 * iwl_dma_addr2rbd_ptr - convert a DMA address to a uCode read buffer ptr
168 */
169static inline __le32 iwl_dma_addr2rbd_ptr(struct iwl_priv *priv,
170 dma_addr_t dma_addr)
171{
172 return cpu_to_le32((u32)(dma_addr >> 8));
173}
174
175/**
176 * iwl_rx_queue_restock - refill RX queue from pre-allocated pool
177 *
178 * If there are slots in the RX queue that need to be restocked,
179 * and we have free pre-allocated buffers, fill the ranks as much
180 * as we can, pulling from rx_free.
181 *
182 * This moves the 'write' index forward to catch up with 'processed', and
183 * also updates the memory address in the firmware to reference the new
184 * target buffer.
185 */
186void iwl_rx_queue_restock(struct iwl_priv *priv)
187{
188 struct iwl_rx_queue *rxq = &priv->rxq;
189 struct list_head *element;
190 struct iwl_rx_mem_buffer *rxb;
191 unsigned long flags;
192 int write;
193
194 spin_lock_irqsave(&rxq->lock, flags);
195 write = rxq->write & ~0x7;
196 while ((iwl_rx_queue_space(rxq) > 0) && (rxq->free_count)) {
197 /* Get next free Rx buffer, remove from free list */
198 element = rxq->rx_free.next;
199 rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
200 list_del(element);
201
202 /* Point to Rx buffer via next RBD in circular buffer */
203 rxq->bd[rxq->write] = iwl_dma_addr2rbd_ptr(priv, rxb->page_dma);
204 rxq->queue[rxq->write] = rxb;
205 rxq->write = (rxq->write + 1) & RX_QUEUE_MASK;
206 rxq->free_count--;
207 }
208 spin_unlock_irqrestore(&rxq->lock, flags);
209 /* If the pre-allocated buffer pool is dropping low, schedule to
210 * refill it */
211 if (rxq->free_count <= RX_LOW_WATERMARK)
212 queue_work(priv->workqueue, &priv->rx_replenish);
213
214
215 /* If we've added more space for the firmware to place data, tell it.
216 * Increment device's write pointer in multiples of 8. */
217 if (rxq->write_actual != (rxq->write & ~0x7)) {
218 spin_lock_irqsave(&rxq->lock, flags);
219 rxq->need_update = 1;
220 spin_unlock_irqrestore(&rxq->lock, flags);
221 iwl_rx_queue_update_write_ptr(priv, rxq);
222 }
223}
224EXPORT_SYMBOL(iwl_rx_queue_restock);
225
226
227/**
228 * iwl_rx_replenish - Move all used packet from rx_used to rx_free
229 *
230 * When moving to rx_free an SKB is allocated for the slot.
231 *
232 * Also restock the Rx queue via iwl_rx_queue_restock.
233 * This is called as a scheduled work item (except for during initialization)
234 */
235void iwl_rx_allocate(struct iwl_priv *priv, gfp_t priority)
236{
237 struct iwl_rx_queue *rxq = &priv->rxq;
238 struct list_head *element;
239 struct iwl_rx_mem_buffer *rxb;
240 struct page *page;
241 unsigned long flags;
242 gfp_t gfp_mask = priority;
243
244 while (1) {
245 spin_lock_irqsave(&rxq->lock, flags);
246 if (list_empty(&rxq->rx_used)) {
247 spin_unlock_irqrestore(&rxq->lock, flags);
248 return;
249 }
250 spin_unlock_irqrestore(&rxq->lock, flags);
251
252 if (rxq->free_count > RX_LOW_WATERMARK)
253 gfp_mask |= __GFP_NOWARN;
254
255 if (priv->hw_params.rx_page_order > 0)
256 gfp_mask |= __GFP_COMP;
257
258 /* Alloc a new receive buffer */
259 page = alloc_pages(gfp_mask, priv->hw_params.rx_page_order);
260 if (!page) {
261 if (net_ratelimit())
262 IWL_DEBUG_INFO(priv, "alloc_pages failed, "
263 "order: %d\n",
264 priv->hw_params.rx_page_order);
265
266 if ((rxq->free_count <= RX_LOW_WATERMARK) &&
267 net_ratelimit())
268 IWL_CRIT(priv, "Failed to alloc_pages with %s. Only %u free buffers remaining.\n",
269 priority == GFP_ATOMIC ? "GFP_ATOMIC" : "GFP_KERNEL",
270 rxq->free_count);
271 /* We don't reschedule replenish work here -- we will
272 * call the restock method and if it still needs
273 * more buffers it will schedule replenish */
274 return;
275 }
276
277 spin_lock_irqsave(&rxq->lock, flags);
278
279 if (list_empty(&rxq->rx_used)) {
280 spin_unlock_irqrestore(&rxq->lock, flags);
281 __free_pages(page, priv->hw_params.rx_page_order);
282 return;
283 }
284 element = rxq->rx_used.next;
285 rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
286 list_del(element);
287
288 spin_unlock_irqrestore(&rxq->lock, flags);
289
290 rxb->page = page;
291 /* Get physical address of the RB */
292 rxb->page_dma = pci_map_page(priv->pci_dev, page, 0,
293 PAGE_SIZE << priv->hw_params.rx_page_order,
294 PCI_DMA_FROMDEVICE);
295 /* dma address must be no more than 36 bits */
296 BUG_ON(rxb->page_dma & ~DMA_BIT_MASK(36));
297 /* and also 256 byte aligned! */
298 BUG_ON(rxb->page_dma & DMA_BIT_MASK(8));
299
300 spin_lock_irqsave(&rxq->lock, flags);
301
302 list_add_tail(&rxb->list, &rxq->rx_free);
303 rxq->free_count++;
304 priv->alloc_rxb_page++;
305
306 spin_unlock_irqrestore(&rxq->lock, flags);
307 }
308}
309
310void iwl_rx_replenish(struct iwl_priv *priv)
311{
312 unsigned long flags;
313
314 iwl_rx_allocate(priv, GFP_KERNEL);
315
316 spin_lock_irqsave(&priv->lock, flags);
317 iwl_rx_queue_restock(priv);
318 spin_unlock_irqrestore(&priv->lock, flags);
319}
320EXPORT_SYMBOL(iwl_rx_replenish);
321
322void iwl_rx_replenish_now(struct iwl_priv *priv)
323{
324 iwl_rx_allocate(priv, GFP_ATOMIC);
325
326 iwl_rx_queue_restock(priv);
327}
328EXPORT_SYMBOL(iwl_rx_replenish_now);
329
330
331/* Assumes that the skb field of the buffers in 'pool' is kept accurate.
332 * If an SKB has been detached, the POOL needs to have its SKB set to NULL
333 * This free routine walks the list of POOL entries and if SKB is set to
334 * non NULL it is unmapped and freed
335 */
336void iwl_rx_queue_free(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
337{
338 int i;
339 for (i = 0; i < RX_QUEUE_SIZE + RX_FREE_BUFFERS; i++) {
340 if (rxq->pool[i].page != NULL) {
341 pci_unmap_page(priv->pci_dev, rxq->pool[i].page_dma,
342 PAGE_SIZE << priv->hw_params.rx_page_order,
343 PCI_DMA_FROMDEVICE);
344 __iwl_free_pages(priv, rxq->pool[i].page);
345 rxq->pool[i].page = NULL;
346 }
347 }
348
349 dma_free_coherent(&priv->pci_dev->dev, 4 * RX_QUEUE_SIZE, rxq->bd,
350 rxq->dma_addr);
351 dma_free_coherent(&priv->pci_dev->dev, sizeof(struct iwl_rb_status),
352 rxq->rb_stts, rxq->rb_stts_dma);
353 rxq->bd = NULL;
354 rxq->rb_stts = NULL;
355}
356EXPORT_SYMBOL(iwl_rx_queue_free);
357 166
358int iwl_rx_queue_alloc(struct iwl_priv *priv) 167int iwl_rx_queue_alloc(struct iwl_priv *priv)
359{ 168{
@@ -396,98 +205,6 @@ err_bd:
396} 205}
397EXPORT_SYMBOL(iwl_rx_queue_alloc); 206EXPORT_SYMBOL(iwl_rx_queue_alloc);
398 207
399void iwl_rx_queue_reset(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
400{
401 unsigned long flags;
402 int i;
403 spin_lock_irqsave(&rxq->lock, flags);
404 INIT_LIST_HEAD(&rxq->rx_free);
405 INIT_LIST_HEAD(&rxq->rx_used);
406 /* Fill the rx_used queue with _all_ of the Rx buffers */
407 for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++) {
408 /* In the reset function, these buffers may have been allocated
409 * to an SKB, so we need to unmap and free potential storage */
410 if (rxq->pool[i].page != NULL) {
411 pci_unmap_page(priv->pci_dev, rxq->pool[i].page_dma,
412 PAGE_SIZE << priv->hw_params.rx_page_order,
413 PCI_DMA_FROMDEVICE);
414 __iwl_free_pages(priv, rxq->pool[i].page);
415 rxq->pool[i].page = NULL;
416 }
417 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
418 }
419
420 /* Set us so that we have processed and used all buffers, but have
421 * not restocked the Rx queue with fresh buffers */
422 rxq->read = rxq->write = 0;
423 rxq->write_actual = 0;
424 rxq->free_count = 0;
425 spin_unlock_irqrestore(&rxq->lock, flags);
426}
427
428int iwl_rx_init(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
429{
430 u32 rb_size;
431 const u32 rfdnlog = RX_QUEUE_SIZE_LOG; /* 256 RBDs */
432 u32 rb_timeout = 0; /* FIXME: RX_RB_TIMEOUT for all devices? */
433
434 if (!priv->cfg->use_isr_legacy)
435 rb_timeout = RX_RB_TIMEOUT;
436
437 if (priv->cfg->mod_params->amsdu_size_8K)
438 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K;
439 else
440 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K;
441
442 /* Stop Rx DMA */
443 iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
444
445 /* Reset driver's Rx queue write index */
446 iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_WPTR_REG, 0);
447
448 /* Tell device where to find RBD circular buffer in DRAM */
449 iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_BASE_REG,
450 (u32)(rxq->dma_addr >> 8));
451
452 /* Tell device where in DRAM to update its Rx status */
453 iwl_write_direct32(priv, FH_RSCSR_CHNL0_STTS_WPTR_REG,
454 rxq->rb_stts_dma >> 4);
455
456 /* Enable Rx DMA
457 * FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY is set because of HW bug in
458 * the credit mechanism in 5000 HW RX FIFO
459 * Direct rx interrupts to hosts
460 * Rx buffer size 4 or 8k
461 * RB timeout 0x10
462 * 256 RBDs
463 */
464 iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG,
465 FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL |
466 FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY |
467 FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL |
468 FH_RCSR_CHNL0_RX_CONFIG_SINGLE_FRAME_MSK |
469 rb_size|
470 (rb_timeout << FH_RCSR_RX_CONFIG_REG_IRQ_RBTH_POS)|
471 (rfdnlog << FH_RCSR_RX_CONFIG_RBDCB_SIZE_POS));
472
473 /* Set interrupt coalescing timer to default (2048 usecs) */
474 iwl_write8(priv, CSR_INT_COALESCING, IWL_HOST_INT_TIMEOUT_DEF);
475
476 return 0;
477}
478
479int iwl_rxq_stop(struct iwl_priv *priv)
480{
481
482 /* stop Rx DMA */
483 iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
484 iwl_poll_direct_bit(priv, FH_MEM_RSSR_RX_STATUS_REG,
485 FH_RSSR_CHNL0_RX_STATUS_CHNL_IDLE, 1000);
486
487 return 0;
488}
489EXPORT_SYMBOL(iwl_rxq_stop);
490
491void iwl_rx_missed_beacon_notif(struct iwl_priv *priv, 208void iwl_rx_missed_beacon_notif(struct iwl_priv *priv,
492 struct iwl_rx_mem_buffer *rxb) 209 struct iwl_rx_mem_buffer *rxb)
493 210
@@ -543,6 +260,7 @@ static void iwl_rx_calc_noise(struct iwl_priv *priv)
543 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER; 260 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
544 int bcn_silence_c = 261 int bcn_silence_c =
545 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER; 262 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
263 int last_rx_noise;
546 264
547 if (bcn_silence_a) { 265 if (bcn_silence_a) {
548 total_silence += bcn_silence_a; 266 total_silence += bcn_silence_a;
@@ -559,13 +277,13 @@ static void iwl_rx_calc_noise(struct iwl_priv *priv)
559 277
560 /* Average among active antennas */ 278 /* Average among active antennas */
561 if (num_active_rx) 279 if (num_active_rx)
562 priv->last_rx_noise = (total_silence / num_active_rx) - 107; 280 last_rx_noise = (total_silence / num_active_rx) - 107;
563 else 281 else
564 priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE; 282 last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
565 283
566 IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n", 284 IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n",
567 bcn_silence_a, bcn_silence_b, bcn_silence_c, 285 bcn_silence_a, bcn_silence_b, bcn_silence_c,
568 priv->last_rx_noise); 286 last_rx_noise);
569} 287}
570 288
571#ifdef CONFIG_IWLWIFI_DEBUG 289#ifdef CONFIG_IWLWIFI_DEBUG
@@ -617,63 +335,6 @@ static void iwl_accumulative_statistics(struct iwl_priv *priv,
617 335
618#define REG_RECALIB_PERIOD (60) 336#define REG_RECALIB_PERIOD (60)
619 337
620/* the threshold ratio of actual_ack_cnt to expected_ack_cnt in percent */
621#define ACK_CNT_RATIO (50)
622#define BA_TIMEOUT_CNT (5)
623#define BA_TIMEOUT_MAX (16)
624
625#if defined(CONFIG_IWLAGN) || defined(CONFIG_IWLAGN_MODULE)
626/**
627 * iwl_good_ack_health - checks for ACK count ratios, BA timeout retries.
628 *
629 * When the ACK count ratio is 0 and aggregated BA timeout retries exceeding
630 * the BA_TIMEOUT_MAX, reload firmware and bring system back to normal
631 * operation state.
632 */
633bool iwl_good_ack_health(struct iwl_priv *priv,
634 struct iwl_rx_packet *pkt)
635{
636 bool rc = true;
637 int actual_ack_cnt_delta, expected_ack_cnt_delta;
638 int ba_timeout_delta;
639
640 actual_ack_cnt_delta =
641 le32_to_cpu(pkt->u.stats.tx.actual_ack_cnt) -
642 le32_to_cpu(priv->statistics.tx.actual_ack_cnt);
643 expected_ack_cnt_delta =
644 le32_to_cpu(pkt->u.stats.tx.expected_ack_cnt) -
645 le32_to_cpu(priv->statistics.tx.expected_ack_cnt);
646 ba_timeout_delta =
647 le32_to_cpu(pkt->u.stats.tx.agg.ba_timeout) -
648 le32_to_cpu(priv->statistics.tx.agg.ba_timeout);
649 if ((priv->_agn.agg_tids_count > 0) &&
650 (expected_ack_cnt_delta > 0) &&
651 (((actual_ack_cnt_delta * 100) / expected_ack_cnt_delta)
652 < ACK_CNT_RATIO) &&
653 (ba_timeout_delta > BA_TIMEOUT_CNT)) {
654 IWL_DEBUG_RADIO(priv, "actual_ack_cnt delta = %d,"
655 " expected_ack_cnt = %d\n",
656 actual_ack_cnt_delta, expected_ack_cnt_delta);
657
658#ifdef CONFIG_IWLWIFI_DEBUG
659 IWL_DEBUG_RADIO(priv, "rx_detected_cnt delta = %d\n",
660 priv->delta_statistics.tx.rx_detected_cnt);
661 IWL_DEBUG_RADIO(priv,
662 "ack_or_ba_timeout_collision delta = %d\n",
663 priv->delta_statistics.tx.
664 ack_or_ba_timeout_collision);
665#endif
666 IWL_DEBUG_RADIO(priv, "agg ba_timeout delta = %d\n",
667 ba_timeout_delta);
668 if (!actual_ack_cnt_delta &&
669 (ba_timeout_delta >= BA_TIMEOUT_MAX))
670 rc = false;
671 }
672 return rc;
673}
674EXPORT_SYMBOL(iwl_good_ack_health);
675#endif
676
677/** 338/**
678 * iwl_good_plcp_health - checks for plcp error. 339 * iwl_good_plcp_health - checks for plcp error.
679 * 340 *
@@ -830,139 +491,6 @@ void iwl_reply_statistics(struct iwl_priv *priv,
830} 491}
831EXPORT_SYMBOL(iwl_reply_statistics); 492EXPORT_SYMBOL(iwl_reply_statistics);
832 493
833/* Calc max signal level (dBm) among 3 possible receivers */
834static inline int iwl_calc_rssi(struct iwl_priv *priv,
835 struct iwl_rx_phy_res *rx_resp)
836{
837 return priv->cfg->ops->utils->calc_rssi(priv, rx_resp);
838}
839
840#ifdef CONFIG_IWLWIFI_DEBUG
841/**
842 * iwl_dbg_report_frame - dump frame to syslog during debug sessions
843 *
844 * You may hack this function to show different aspects of received frames,
845 * including selective frame dumps.
846 * group100 parameter selects whether to show 1 out of 100 good data frames.
847 * All beacon and probe response frames are printed.
848 */
849static void iwl_dbg_report_frame(struct iwl_priv *priv,
850 struct iwl_rx_phy_res *phy_res, u16 length,
851 struct ieee80211_hdr *header, int group100)
852{
853 u32 to_us;
854 u32 print_summary = 0;
855 u32 print_dump = 0; /* set to 1 to dump all frames' contents */
856 u32 hundred = 0;
857 u32 dataframe = 0;
858 __le16 fc;
859 u16 seq_ctl;
860 u16 channel;
861 u16 phy_flags;
862 u32 rate_n_flags;
863 u32 tsf_low;
864 int rssi;
865
866 if (likely(!(iwl_get_debug_level(priv) & IWL_DL_RX)))
867 return;
868
869 /* MAC header */
870 fc = header->frame_control;
871 seq_ctl = le16_to_cpu(header->seq_ctrl);
872
873 /* metadata */
874 channel = le16_to_cpu(phy_res->channel);
875 phy_flags = le16_to_cpu(phy_res->phy_flags);
876 rate_n_flags = le32_to_cpu(phy_res->rate_n_flags);
877
878 /* signal statistics */
879 rssi = iwl_calc_rssi(priv, phy_res);
880 tsf_low = le64_to_cpu(phy_res->timestamp) & 0x0ffffffff;
881
882 to_us = !compare_ether_addr(header->addr1, priv->mac_addr);
883
884 /* if data frame is to us and all is good,
885 * (optionally) print summary for only 1 out of every 100 */
886 if (to_us && (fc & ~cpu_to_le16(IEEE80211_FCTL_PROTECTED)) ==
887 cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FTYPE_DATA)) {
888 dataframe = 1;
889 if (!group100)
890 print_summary = 1; /* print each frame */
891 else if (priv->framecnt_to_us < 100) {
892 priv->framecnt_to_us++;
893 print_summary = 0;
894 } else {
895 priv->framecnt_to_us = 0;
896 print_summary = 1;
897 hundred = 1;
898 }
899 } else {
900 /* print summary for all other frames */
901 print_summary = 1;
902 }
903
904 if (print_summary) {
905 char *title;
906 int rate_idx;
907 u32 bitrate;
908
909 if (hundred)
910 title = "100Frames";
911 else if (ieee80211_has_retry(fc))
912 title = "Retry";
913 else if (ieee80211_is_assoc_resp(fc))
914 title = "AscRsp";
915 else if (ieee80211_is_reassoc_resp(fc))
916 title = "RasRsp";
917 else if (ieee80211_is_probe_resp(fc)) {
918 title = "PrbRsp";
919 print_dump = 1; /* dump frame contents */
920 } else if (ieee80211_is_beacon(fc)) {
921 title = "Beacon";
922 print_dump = 1; /* dump frame contents */
923 } else if (ieee80211_is_atim(fc))
924 title = "ATIM";
925 else if (ieee80211_is_auth(fc))
926 title = "Auth";
927 else if (ieee80211_is_deauth(fc))
928 title = "DeAuth";
929 else if (ieee80211_is_disassoc(fc))
930 title = "DisAssoc";
931 else
932 title = "Frame";
933
934 rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
935 if (unlikely((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT))) {
936 bitrate = 0;
937 WARN_ON_ONCE(1);
938 } else {
939 bitrate = iwl_rates[rate_idx].ieee / 2;
940 }
941
942 /* print frame summary.
943 * MAC addresses show just the last byte (for brevity),
944 * but you can hack it to show more, if you'd like to. */
945 if (dataframe)
946 IWL_DEBUG_RX(priv, "%s: mhd=0x%04x, dst=0x%02x, "
947 "len=%u, rssi=%d, chnl=%d, rate=%u, \n",
948 title, le16_to_cpu(fc), header->addr1[5],
949 length, rssi, channel, bitrate);
950 else {
951 /* src/dst addresses assume managed mode */
952 IWL_DEBUG_RX(priv, "%s: 0x%04x, dst=0x%02x, src=0x%02x, "
953 "len=%u, rssi=%d, tim=%lu usec, "
954 "phy=0x%02x, chnl=%d\n",
955 title, le16_to_cpu(fc), header->addr1[5],
956 header->addr3[5], length, rssi,
957 tsf_low - priv->scan_start_tsf,
958 phy_flags, channel);
959 }
960 }
961 if (print_dump)
962 iwl_print_hex_dump(priv, IWL_DL_RX, header, length);
963}
964#endif
965
966/* 494/*
967 * returns non-zero if packet should be dropped 495 * returns non-zero if packet should be dropped
968 */ 496 */
@@ -1010,281 +538,3 @@ int iwl_set_decrypted_flag(struct iwl_priv *priv,
1010 return 0; 538 return 0;
1011} 539}
1012EXPORT_SYMBOL(iwl_set_decrypted_flag); 540EXPORT_SYMBOL(iwl_set_decrypted_flag);
1013
1014static u32 iwl_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
1015{
1016 u32 decrypt_out = 0;
1017
1018 if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
1019 RX_RES_STATUS_STATION_FOUND)
1020 decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
1021 RX_RES_STATUS_NO_STATION_INFO_MISMATCH);
1022
1023 decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
1024
1025 /* packet was not encrypted */
1026 if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
1027 RX_RES_STATUS_SEC_TYPE_NONE)
1028 return decrypt_out;
1029
1030 /* packet was encrypted with unknown alg */
1031 if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
1032 RX_RES_STATUS_SEC_TYPE_ERR)
1033 return decrypt_out;
1034
1035 /* decryption was not done in HW */
1036 if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
1037 RX_MPDU_RES_STATUS_DEC_DONE_MSK)
1038 return decrypt_out;
1039
1040 switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
1041
1042 case RX_RES_STATUS_SEC_TYPE_CCMP:
1043 /* alg is CCM: check MIC only */
1044 if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
1045 /* Bad MIC */
1046 decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
1047 else
1048 decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
1049
1050 break;
1051
1052 case RX_RES_STATUS_SEC_TYPE_TKIP:
1053 if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
1054 /* Bad TTAK */
1055 decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
1056 break;
1057 }
1058 /* fall through if TTAK OK */
1059 default:
1060 if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
1061 decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
1062 else
1063 decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
1064 break;
1065 };
1066
1067 IWL_DEBUG_RX(priv, "decrypt_in:0x%x decrypt_out = 0x%x\n",
1068 decrypt_in, decrypt_out);
1069
1070 return decrypt_out;
1071}
1072
1073static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
1074 struct ieee80211_hdr *hdr,
1075 u16 len,
1076 u32 ampdu_status,
1077 struct iwl_rx_mem_buffer *rxb,
1078 struct ieee80211_rx_status *stats)
1079{
1080 struct sk_buff *skb;
1081 int ret = 0;
1082 __le16 fc = hdr->frame_control;
1083
1084 /* We only process data packets if the interface is open */
1085 if (unlikely(!priv->is_open)) {
1086 IWL_DEBUG_DROP_LIMIT(priv,
1087 "Dropping packet while interface is not open.\n");
1088 return;
1089 }
1090
1091 /* In case of HW accelerated crypto and bad decryption, drop */
1092 if (!priv->cfg->mod_params->sw_crypto &&
1093 iwl_set_decrypted_flag(priv, hdr, ampdu_status, stats))
1094 return;
1095
1096 skb = alloc_skb(IWL_LINK_HDR_MAX * 2, GFP_ATOMIC);
1097 if (!skb) {
1098 IWL_ERR(priv, "alloc_skb failed\n");
1099 return;
1100 }
1101
1102 skb_reserve(skb, IWL_LINK_HDR_MAX);
1103 skb_add_rx_frag(skb, 0, rxb->page, (void *)hdr - rxb_addr(rxb), len);
1104
1105 /* mac80211 currently doesn't support paged SKB. Convert it to
1106 * linear SKB for management frame and data frame requires
1107 * software decryption or software defragementation. */
1108 if (ieee80211_is_mgmt(fc) ||
1109 ieee80211_has_protected(fc) ||
1110 ieee80211_has_morefrags(fc) ||
1111 le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG ||
1112 (ieee80211_is_data_qos(fc) &&
1113 *ieee80211_get_qos_ctl(hdr) &
1114 IEEE80211_QOS_CONTROL_A_MSDU_PRESENT))
1115 ret = skb_linearize(skb);
1116 else
1117 ret = __pskb_pull_tail(skb, min_t(u16, IWL_LINK_HDR_MAX, len)) ?
1118 0 : -ENOMEM;
1119
1120 if (ret) {
1121 kfree_skb(skb);
1122 goto out;
1123 }
1124
1125 /*
1126 * XXX: We cannot touch the page and its virtual memory (hdr) after
1127 * here. It might have already been freed by the above skb change.
1128 */
1129
1130 iwl_update_stats(priv, false, fc, len);
1131 memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
1132
1133 ieee80211_rx(priv->hw, skb);
1134 out:
1135 priv->alloc_rxb_page--;
1136 rxb->page = NULL;
1137}
1138
1139/* Called for REPLY_RX (legacy ABG frames), or
1140 * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
1141void iwl_rx_reply_rx(struct iwl_priv *priv,
1142 struct iwl_rx_mem_buffer *rxb)
1143{
1144 struct ieee80211_hdr *header;
1145 struct ieee80211_rx_status rx_status;
1146 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1147 struct iwl_rx_phy_res *phy_res;
1148 __le32 rx_pkt_status;
1149 struct iwl4965_rx_mpdu_res_start *amsdu;
1150 u32 len;
1151 u32 ampdu_status;
1152 u32 rate_n_flags;
1153
1154 /**
1155 * REPLY_RX and REPLY_RX_MPDU_CMD are handled differently.
1156 * REPLY_RX: physical layer info is in this buffer
1157 * REPLY_RX_MPDU_CMD: physical layer info was sent in separate
1158 * command and cached in priv->last_phy_res
1159 *
1160 * Here we set up local variables depending on which command is
1161 * received.
1162 */
1163 if (pkt->hdr.cmd == REPLY_RX) {
1164 phy_res = (struct iwl_rx_phy_res *)pkt->u.raw;
1165 header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*phy_res)
1166 + phy_res->cfg_phy_cnt);
1167
1168 len = le16_to_cpu(phy_res->byte_count);
1169 rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*phy_res) +
1170 phy_res->cfg_phy_cnt + len);
1171 ampdu_status = le32_to_cpu(rx_pkt_status);
1172 } else {
1173 if (!priv->last_phy_res[0]) {
1174 IWL_ERR(priv, "MPDU frame without cached PHY data\n");
1175 return;
1176 }
1177 phy_res = (struct iwl_rx_phy_res *)&priv->last_phy_res[1];
1178 amsdu = (struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;
1179 header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*amsdu));
1180 len = le16_to_cpu(amsdu->byte_count);
1181 rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*amsdu) + len);
1182 ampdu_status = iwl_translate_rx_status(priv,
1183 le32_to_cpu(rx_pkt_status));
1184 }
1185
1186 if ((unlikely(phy_res->cfg_phy_cnt > 20))) {
1187 IWL_DEBUG_DROP(priv, "dsp size out of range [0,20]: %d/n",
1188 phy_res->cfg_phy_cnt);
1189 return;
1190 }
1191
1192 if (!(rx_pkt_status & RX_RES_STATUS_NO_CRC32_ERROR) ||
1193 !(rx_pkt_status & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
1194 IWL_DEBUG_RX(priv, "Bad CRC or FIFO: 0x%08X.\n",
1195 le32_to_cpu(rx_pkt_status));
1196 return;
1197 }
1198
1199 /* This will be used in several places later */
1200 rate_n_flags = le32_to_cpu(phy_res->rate_n_flags);
1201
1202 /* rx_status carries information about the packet to mac80211 */
1203 rx_status.mactime = le64_to_cpu(phy_res->timestamp);
1204 rx_status.freq =
1205 ieee80211_channel_to_frequency(le16_to_cpu(phy_res->channel));
1206 rx_status.band = (phy_res->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
1207 IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
1208 rx_status.rate_idx =
1209 iwl_hwrate_to_mac80211_idx(rate_n_flags, rx_status.band);
1210 rx_status.flag = 0;
1211
1212 /* TSF isn't reliable. In order to allow smooth user experience,
1213 * this W/A doesn't propagate it to the mac80211 */
1214 /*rx_status.flag |= RX_FLAG_TSFT;*/
1215
1216 priv->ucode_beacon_time = le32_to_cpu(phy_res->beacon_time_stamp);
1217
1218 /* Find max signal strength (dBm) among 3 antenna/receiver chains */
1219 rx_status.signal = iwl_calc_rssi(priv, phy_res);
1220
1221 /* Meaningful noise values are available only from beacon statistics,
1222 * which are gathered only when associated, and indicate noise
1223 * only for the associated network channel ...
1224 * Ignore these noise values while scanning (other channels) */
1225 if (iwl_is_associated(priv) &&
1226 !test_bit(STATUS_SCANNING, &priv->status)) {
1227 rx_status.noise = priv->last_rx_noise;
1228 } else {
1229 rx_status.noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
1230 }
1231
1232 /* Reset beacon noise level if not associated. */
1233 if (!iwl_is_associated(priv))
1234 priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
1235
1236#ifdef CONFIG_IWLWIFI_DEBUG
1237 /* Set "1" to report good data frames in groups of 100 */
1238 if (unlikely(iwl_get_debug_level(priv) & IWL_DL_RX))
1239 iwl_dbg_report_frame(priv, phy_res, len, header, 1);
1240#endif
1241 iwl_dbg_log_rx_data_frame(priv, len, header);
1242 IWL_DEBUG_STATS_LIMIT(priv, "Rssi %d, noise %d, TSF %llu\n",
1243 rx_status.signal, rx_status.noise,
1244 (unsigned long long)rx_status.mactime);
1245
1246 /*
1247 * "antenna number"
1248 *
1249 * It seems that the antenna field in the phy flags value
1250 * is actually a bit field. This is undefined by radiotap,
1251 * it wants an actual antenna number but I always get "7"
1252 * for most legacy frames I receive indicating that the
1253 * same frame was received on all three RX chains.
1254 *
1255 * I think this field should be removed in favor of a
1256 * new 802.11n radiotap field "RX chains" that is defined
1257 * as a bitmask.
1258 */
1259 rx_status.antenna =
1260 (le16_to_cpu(phy_res->phy_flags) & RX_RES_PHY_FLAGS_ANTENNA_MSK)
1261 >> RX_RES_PHY_FLAGS_ANTENNA_POS;
1262
1263 /* set the preamble flag if appropriate */
1264 if (phy_res->phy_flags & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK)
1265 rx_status.flag |= RX_FLAG_SHORTPRE;
1266
1267 /* Set up the HT phy flags */
1268 if (rate_n_flags & RATE_MCS_HT_MSK)
1269 rx_status.flag |= RX_FLAG_HT;
1270 if (rate_n_flags & RATE_MCS_HT40_MSK)
1271 rx_status.flag |= RX_FLAG_40MHZ;
1272 if (rate_n_flags & RATE_MCS_SGI_MSK)
1273 rx_status.flag |= RX_FLAG_SHORT_GI;
1274
1275 iwl_pass_packet_to_mac80211(priv, header, len, ampdu_status,
1276 rxb, &rx_status);
1277}
1278EXPORT_SYMBOL(iwl_rx_reply_rx);
1279
1280/* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
1281 * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
1282void iwl_rx_reply_rx_phy(struct iwl_priv *priv,
1283 struct iwl_rx_mem_buffer *rxb)
1284{
1285 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1286 priv->last_phy_res[0] = 1;
1287 memcpy(&priv->last_phy_res[1], &(pkt->u.raw[0]),
1288 sizeof(struct iwl_rx_phy_res));
1289}
1290EXPORT_SYMBOL(iwl_rx_reply_rx_phy);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-26 21:37:27 -0500