1 /******************************************************************************
3 * Copyright(c) 2003 - 2010 Intel Corporation. All rights reserved.
5 * Portions of this file are derived from the ipw3945 project, as well
6 * as portions of the ieee80211 subsystem header files.
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.
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
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
21 * The full GNU General Public License is included in this distribution in the
22 * file called LICENSE.
24 * Contact Information:
25 * Intel Linux Wireless <ilw@linux.intel.com>
26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
28 *****************************************************************************/
30 #include <linux/etherdevice.h>
31 #include <net/mac80211.h>
32 #include <asm/unaligned.h>
33 #include "iwl-eeprom.h"
38 #include "iwl-calib.h"
39 #include "iwl-helpers.h"
40 /************************** RX-FUNCTIONS ****************************/
42 * Rx theory of operation
44 * Driver allocates a circular buffer of Receive Buffer Descriptors (RBDs),
45 * each of which point to Receive Buffers to be filled by the NIC. These get
46 * used not only for Rx frames, but for any command response or notification
47 * from the NIC. The driver and NIC manage the Rx buffers by means
48 * of indexes into the circular buffer.
51 * The host/firmware share two index registers for managing the Rx buffers.
53 * The READ index maps to the first position that the firmware may be writing
54 * to -- the driver can read up to (but not including) this position and get
56 * The READ index is managed by the firmware once the card is enabled.
58 * The WRITE index maps to the last position the driver has read from -- the
59 * position preceding WRITE is the last slot the firmware can place a packet.
61 * The queue is empty (no good data) if WRITE = READ - 1, and is full if
64 * During initialization, the host sets up the READ queue position to the first
65 * INDEX position, and WRITE to the last (READ - 1 wrapped)
67 * When the firmware places a packet in a buffer, it will advance the READ index
68 * and fire the RX interrupt. The driver can then query the READ index and
69 * process as many packets as possible, moving the WRITE index forward as it
70 * resets the Rx queue buffers with new memory.
72 * The management in the driver is as follows:
73 * + A list of pre-allocated SKBs is stored in iwl->rxq->rx_free. When
74 * iwl->rxq->free_count drops to or below RX_LOW_WATERMARK, work is scheduled
75 * to replenish the iwl->rxq->rx_free.
76 * + In iwl_rx_replenish (scheduled) if 'processed' != 'read' then the
77 * iwl->rxq is replenished and the READ INDEX is updated (updating the
78 * 'processed' and 'read' driver indexes as well)
79 * + A received packet is processed and handed to the kernel network stack,
80 * detached from the iwl->rxq. The driver 'processed' index is updated.
81 * + The Host/Firmware iwl->rxq is replenished at tasklet time from the rx_free
82 * list. If there are no allocated buffers in iwl->rxq->rx_free, the READ
83 * INDEX is not incremented and iwl->status(RX_STALLED) is set. If there
84 * were enough free buffers and RX_STALLED is set it is cleared.
89 * iwl_rx_queue_alloc() Allocates rx_free
90 * iwl_rx_replenish() Replenishes rx_free list from rx_used, and calls
91 * iwl_rx_queue_restock
92 * iwl_rx_queue_restock() Moves available buffers from rx_free into Rx
93 * queue, updates firmware pointers, and updates
94 * the WRITE index. If insufficient rx_free buffers
95 * are available, schedules iwl_rx_replenish
97 * -- enable interrupts --
98 * ISR - iwl_rx() Detach iwl_rx_mem_buffers from pool up to the
99 * READ INDEX, detaching the SKB from the pool.
100 * Moves the packet buffer from queue to rx_used.
101 * Calls iwl_rx_queue_restock to refill any empty
108 * iwl_rx_queue_space - Return number of free slots available in queue.
110 int iwl_rx_queue_space(const struct iwl_rx_queue *q)
112 int s = q->read - q->write;
115 /* keep some buffer to not confuse full and empty queue */
121 EXPORT_SYMBOL(iwl_rx_queue_space);
124 * iwl_rx_queue_update_write_ptr - Update the write pointer for the RX queue
126 int iwl_rx_queue_update_write_ptr(struct iwl_priv *priv, struct iwl_rx_queue *q)
129 u32 rx_wrt_ptr_reg = priv->hw_params.rx_wrt_ptr_reg;
133 spin_lock_irqsave(&q->lock, flags);
135 if (q->need_update == 0)
138 /* If power-saving is in use, make sure device is awake */
139 if (test_bit(STATUS_POWER_PMI, &priv->status)) {
140 reg = iwl_read32(priv, CSR_UCODE_DRV_GP1);
142 if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
143 IWL_DEBUG_INFO(priv, "Rx queue requesting wakeup, GP1 = 0x%x\n",
145 iwl_set_bit(priv, CSR_GP_CNTRL,
146 CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
150 q->write_actual = (q->write & ~0x7);
151 iwl_write_direct32(priv, rx_wrt_ptr_reg, q->write_actual);
153 /* Else device is assumed to be awake */
155 /* Device expects a multiple of 8 */
156 q->write_actual = (q->write & ~0x7);
157 iwl_write_direct32(priv, rx_wrt_ptr_reg, q->write_actual);
163 spin_unlock_irqrestore(&q->lock, flags);
166 EXPORT_SYMBOL(iwl_rx_queue_update_write_ptr);
168 * iwl_dma_addr2rbd_ptr - convert a DMA address to a uCode read buffer ptr
170 static inline __le32 iwl_dma_addr2rbd_ptr(struct iwl_priv *priv,
173 return cpu_to_le32((u32)(dma_addr >> 8));
177 * iwl_rx_queue_restock - refill RX queue from pre-allocated pool
179 * If there are slots in the RX queue that need to be restocked,
180 * and we have free pre-allocated buffers, fill the ranks as much
181 * as we can, pulling from rx_free.
183 * This moves the 'write' index forward to catch up with 'processed', and
184 * also updates the memory address in the firmware to reference the new
187 int iwl_rx_queue_restock(struct iwl_priv *priv)
189 struct iwl_rx_queue *rxq = &priv->rxq;
190 struct list_head *element;
191 struct iwl_rx_mem_buffer *rxb;
196 spin_lock_irqsave(&rxq->lock, flags);
197 write = rxq->write & ~0x7;
198 while ((iwl_rx_queue_space(rxq) > 0) && (rxq->free_count)) {
199 /* Get next free Rx buffer, remove from free list */
200 element = rxq->rx_free.next;
201 rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
204 /* Point to Rx buffer via next RBD in circular buffer */
205 rxq->bd[rxq->write] = iwl_dma_addr2rbd_ptr(priv, rxb->page_dma);
206 rxq->queue[rxq->write] = rxb;
207 rxq->write = (rxq->write + 1) & RX_QUEUE_MASK;
210 spin_unlock_irqrestore(&rxq->lock, flags);
211 /* If the pre-allocated buffer pool is dropping low, schedule to
213 if (rxq->free_count <= RX_LOW_WATERMARK)
214 queue_work(priv->workqueue, &priv->rx_replenish);
217 /* If we've added more space for the firmware to place data, tell it.
218 * Increment device's write pointer in multiples of 8. */
219 if (rxq->write_actual != (rxq->write & ~0x7)) {
220 spin_lock_irqsave(&rxq->lock, flags);
221 rxq->need_update = 1;
222 spin_unlock_irqrestore(&rxq->lock, flags);
223 ret = iwl_rx_queue_update_write_ptr(priv, rxq);
228 EXPORT_SYMBOL(iwl_rx_queue_restock);
232 * iwl_rx_replenish - Move all used packet from rx_used to rx_free
234 * When moving to rx_free an SKB is allocated for the slot.
236 * Also restock the Rx queue via iwl_rx_queue_restock.
237 * This is called as a scheduled work item (except for during initialization)
239 void iwl_rx_allocate(struct iwl_priv *priv, gfp_t priority)
241 struct iwl_rx_queue *rxq = &priv->rxq;
242 struct list_head *element;
243 struct iwl_rx_mem_buffer *rxb;
246 gfp_t gfp_mask = priority;
249 spin_lock_irqsave(&rxq->lock, flags);
250 if (list_empty(&rxq->rx_used)) {
251 spin_unlock_irqrestore(&rxq->lock, flags);
254 spin_unlock_irqrestore(&rxq->lock, flags);
256 if (rxq->free_count > RX_LOW_WATERMARK)
257 gfp_mask |= __GFP_NOWARN;
259 if (priv->hw_params.rx_page_order > 0)
260 gfp_mask |= __GFP_COMP;
262 /* Alloc a new receive buffer */
263 page = alloc_pages(gfp_mask, priv->hw_params.rx_page_order);
266 IWL_DEBUG_INFO(priv, "alloc_pages failed, "
268 priv->hw_params.rx_page_order);
270 if ((rxq->free_count <= RX_LOW_WATERMARK) &&
272 IWL_CRIT(priv, "Failed to alloc_pages with %s. Only %u free buffers remaining.\n",
273 priority == GFP_ATOMIC ? "GFP_ATOMIC" : "GFP_KERNEL",
275 /* We don't reschedule replenish work here -- we will
276 * call the restock method and if it still needs
277 * more buffers it will schedule replenish */
281 spin_lock_irqsave(&rxq->lock, flags);
283 if (list_empty(&rxq->rx_used)) {
284 spin_unlock_irqrestore(&rxq->lock, flags);
285 __free_pages(page, priv->hw_params.rx_page_order);
288 element = rxq->rx_used.next;
289 rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
292 spin_unlock_irqrestore(&rxq->lock, flags);
295 /* Get physical address of the RB */
296 rxb->page_dma = pci_map_page(priv->pci_dev, page, 0,
297 PAGE_SIZE << priv->hw_params.rx_page_order,
299 /* dma address must be no more than 36 bits */
300 BUG_ON(rxb->page_dma & ~DMA_BIT_MASK(36));
301 /* and also 256 byte aligned! */
302 BUG_ON(rxb->page_dma & DMA_BIT_MASK(8));
304 spin_lock_irqsave(&rxq->lock, flags);
306 list_add_tail(&rxb->list, &rxq->rx_free);
308 priv->alloc_rxb_page++;
310 spin_unlock_irqrestore(&rxq->lock, flags);
314 void iwl_rx_replenish(struct iwl_priv *priv)
318 iwl_rx_allocate(priv, GFP_KERNEL);
320 spin_lock_irqsave(&priv->lock, flags);
321 iwl_rx_queue_restock(priv);
322 spin_unlock_irqrestore(&priv->lock, flags);
324 EXPORT_SYMBOL(iwl_rx_replenish);
326 void iwl_rx_replenish_now(struct iwl_priv *priv)
328 iwl_rx_allocate(priv, GFP_ATOMIC);
330 iwl_rx_queue_restock(priv);
332 EXPORT_SYMBOL(iwl_rx_replenish_now);
335 /* Assumes that the skb field of the buffers in 'pool' is kept accurate.
336 * If an SKB has been detached, the POOL needs to have its SKB set to NULL
337 * This free routine walks the list of POOL entries and if SKB is set to
338 * non NULL it is unmapped and freed
340 void iwl_rx_queue_free(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
343 for (i = 0; i < RX_QUEUE_SIZE + RX_FREE_BUFFERS; i++) {
344 if (rxq->pool[i].page != NULL) {
345 pci_unmap_page(priv->pci_dev, rxq->pool[i].page_dma,
346 PAGE_SIZE << priv->hw_params.rx_page_order,
348 __iwl_free_pages(priv, rxq->pool[i].page);
349 rxq->pool[i].page = NULL;
353 pci_free_consistent(priv->pci_dev, 4 * RX_QUEUE_SIZE, rxq->bd,
355 pci_free_consistent(priv->pci_dev, sizeof(struct iwl_rb_status),
356 rxq->rb_stts, rxq->rb_stts_dma);
360 EXPORT_SYMBOL(iwl_rx_queue_free);
362 int iwl_rx_queue_alloc(struct iwl_priv *priv)
364 struct iwl_rx_queue *rxq = &priv->rxq;
365 struct pci_dev *dev = priv->pci_dev;
368 spin_lock_init(&rxq->lock);
369 INIT_LIST_HEAD(&rxq->rx_free);
370 INIT_LIST_HEAD(&rxq->rx_used);
372 /* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */
373 rxq->bd = pci_alloc_consistent(dev, 4 * RX_QUEUE_SIZE, &rxq->dma_addr);
377 rxq->rb_stts = pci_alloc_consistent(dev, sizeof(struct iwl_rb_status),
382 /* Fill the rx_used queue with _all_ of the Rx buffers */
383 for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++)
384 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
386 /* Set us so that we have processed and used all buffers, but have
387 * not restocked the Rx queue with fresh buffers */
388 rxq->read = rxq->write = 0;
389 rxq->write_actual = 0;
391 rxq->need_update = 0;
395 pci_free_consistent(priv->pci_dev, 4 * RX_QUEUE_SIZE, rxq->bd,
400 EXPORT_SYMBOL(iwl_rx_queue_alloc);
402 void iwl_rx_queue_reset(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
406 spin_lock_irqsave(&rxq->lock, flags);
407 INIT_LIST_HEAD(&rxq->rx_free);
408 INIT_LIST_HEAD(&rxq->rx_used);
409 /* Fill the rx_used queue with _all_ of the Rx buffers */
410 for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++) {
411 /* In the reset function, these buffers may have been allocated
412 * to an SKB, so we need to unmap and free potential storage */
413 if (rxq->pool[i].page != NULL) {
414 pci_unmap_page(priv->pci_dev, rxq->pool[i].page_dma,
415 PAGE_SIZE << priv->hw_params.rx_page_order,
417 __iwl_free_pages(priv, rxq->pool[i].page);
418 rxq->pool[i].page = NULL;
420 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
423 /* Set us so that we have processed and used all buffers, but have
424 * not restocked the Rx queue with fresh buffers */
425 rxq->read = rxq->write = 0;
426 rxq->write_actual = 0;
428 spin_unlock_irqrestore(&rxq->lock, flags);
431 int iwl_rx_init(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
434 const u32 rfdnlog = RX_QUEUE_SIZE_LOG; /* 256 RBDs */
435 u32 rb_timeout = 0; /* FIXME: RX_RB_TIMEOUT for all devices? */
437 if (!priv->cfg->use_isr_legacy)
438 rb_timeout = RX_RB_TIMEOUT;
440 if (priv->cfg->mod_params->amsdu_size_8K)
441 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K;
443 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K;
446 iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
448 /* Reset driver's Rx queue write index */
449 iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_WPTR_REG, 0);
451 /* Tell device where to find RBD circular buffer in DRAM */
452 iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_BASE_REG,
453 (u32)(rxq->dma_addr >> 8));
455 /* Tell device where in DRAM to update its Rx status */
456 iwl_write_direct32(priv, FH_RSCSR_CHNL0_STTS_WPTR_REG,
457 rxq->rb_stts_dma >> 4);
460 * FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY is set because of HW bug in
461 * the credit mechanism in 5000 HW RX FIFO
462 * Direct rx interrupts to hosts
463 * Rx buffer size 4 or 8k
467 iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG,
468 FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL |
469 FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY |
470 FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL |
471 FH_RCSR_CHNL0_RX_CONFIG_SINGLE_FRAME_MSK |
473 (rb_timeout << FH_RCSR_RX_CONFIG_REG_IRQ_RBTH_POS)|
474 (rfdnlog << FH_RCSR_RX_CONFIG_RBDCB_SIZE_POS));
476 /* Set interrupt coalescing timer to default (2048 usecs) */
477 iwl_write8(priv, CSR_INT_COALESCING, IWL_HOST_INT_TIMEOUT_DEF);
482 int iwl_rxq_stop(struct iwl_priv *priv)
486 iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
487 iwl_poll_direct_bit(priv, FH_MEM_RSSR_RX_STATUS_REG,
488 FH_RSSR_CHNL0_RX_STATUS_CHNL_IDLE, 1000);
492 EXPORT_SYMBOL(iwl_rxq_stop);
494 void iwl_rx_missed_beacon_notif(struct iwl_priv *priv,
495 struct iwl_rx_mem_buffer *rxb)
498 struct iwl_rx_packet *pkt = rxb_addr(rxb);
499 struct iwl_missed_beacon_notif *missed_beacon;
501 missed_beacon = &pkt->u.missed_beacon;
502 if (le32_to_cpu(missed_beacon->consecutive_missed_beacons) >
503 priv->missed_beacon_threshold) {
504 IWL_DEBUG_CALIB(priv, "missed bcn cnsq %d totl %d rcd %d expctd %d\n",
505 le32_to_cpu(missed_beacon->consecutive_missed_beacons),
506 le32_to_cpu(missed_beacon->total_missed_becons),
507 le32_to_cpu(missed_beacon->num_recvd_beacons),
508 le32_to_cpu(missed_beacon->num_expected_beacons));
509 if (!test_bit(STATUS_SCANNING, &priv->status))
510 iwl_init_sensitivity(priv);
513 EXPORT_SYMBOL(iwl_rx_missed_beacon_notif);
516 /* Calculate noise level, based on measurements during network silence just
517 * before arriving beacon. This measurement can be done only if we know
518 * exactly when to expect beacons, therefore only when we're associated. */
519 static void iwl_rx_calc_noise(struct iwl_priv *priv)
521 struct statistics_rx_non_phy *rx_info
522 = &(priv->statistics.rx.general);
523 int num_active_rx = 0;
524 int total_silence = 0;
526 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
528 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
530 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
533 total_silence += bcn_silence_a;
537 total_silence += bcn_silence_b;
541 total_silence += bcn_silence_c;
545 /* Average among active antennas */
547 priv->last_rx_noise = (total_silence / num_active_rx) - 107;
549 priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
551 IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n",
552 bcn_silence_a, bcn_silence_b, bcn_silence_c,
553 priv->last_rx_noise);
556 #ifdef CONFIG_IWLWIFI_DEBUG
558 * based on the assumption of all statistics counter are in DWORD
559 * FIXME: This function is for debugging, do not deal with
560 * the case of counters roll-over.
562 static void iwl_accumulative_statistics(struct iwl_priv *priv,
568 u32 *delta, *max_delta;
570 prev_stats = (__le32 *)&priv->statistics;
571 accum_stats = (u32 *)&priv->accum_statistics;
572 delta = (u32 *)&priv->delta_statistics;
573 max_delta = (u32 *)&priv->max_delta;
575 for (i = sizeof(__le32); i < sizeof(struct iwl_notif_statistics);
576 i += sizeof(__le32), stats++, prev_stats++, delta++,
577 max_delta++, accum_stats++) {
578 if (le32_to_cpu(*stats) > le32_to_cpu(*prev_stats)) {
579 *delta = (le32_to_cpu(*stats) -
580 le32_to_cpu(*prev_stats));
581 *accum_stats += *delta;
582 if (*delta > *max_delta)
587 /* reset accumulative statistics for "no-counter" type statistics */
588 priv->accum_statistics.general.temperature =
589 priv->statistics.general.temperature;
590 priv->accum_statistics.general.temperature_m =
591 priv->statistics.general.temperature_m;
592 priv->accum_statistics.general.ttl_timestamp =
593 priv->statistics.general.ttl_timestamp;
594 priv->accum_statistics.tx.tx_power.ant_a =
595 priv->statistics.tx.tx_power.ant_a;
596 priv->accum_statistics.tx.tx_power.ant_b =
597 priv->statistics.tx.tx_power.ant_b;
598 priv->accum_statistics.tx.tx_power.ant_c =
599 priv->statistics.tx.tx_power.ant_c;
603 #define REG_RECALIB_PERIOD (60)
605 void iwl_rx_statistics(struct iwl_priv *priv,
606 struct iwl_rx_mem_buffer *rxb)
609 struct iwl_rx_packet *pkt = rxb_addr(rxb);
611 IWL_DEBUG_RX(priv, "Statistics notification received (%d vs %d).\n",
612 (int)sizeof(priv->statistics),
613 le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK);
615 change = ((priv->statistics.general.temperature !=
616 pkt->u.stats.general.temperature) ||
617 ((priv->statistics.flag &
618 STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
619 (pkt->u.stats.flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK)));
621 #ifdef CONFIG_IWLWIFI_DEBUG
622 iwl_accumulative_statistics(priv, (__le32 *)&pkt->u.stats);
624 memcpy(&priv->statistics, &pkt->u.stats, sizeof(priv->statistics));
626 set_bit(STATUS_STATISTICS, &priv->status);
628 /* Reschedule the statistics timer to occur in
629 * REG_RECALIB_PERIOD seconds to ensure we get a
630 * thermal update even if the uCode doesn't give
632 mod_timer(&priv->statistics_periodic, jiffies +
633 msecs_to_jiffies(REG_RECALIB_PERIOD * 1000));
635 if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
636 (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
637 iwl_rx_calc_noise(priv);
638 queue_work(priv->workqueue, &priv->run_time_calib_work);
640 if (priv->cfg->ops->lib->temp_ops.temperature && change)
641 priv->cfg->ops->lib->temp_ops.temperature(priv);
643 EXPORT_SYMBOL(iwl_rx_statistics);
645 void iwl_reply_statistics(struct iwl_priv *priv,
646 struct iwl_rx_mem_buffer *rxb)
648 struct iwl_rx_packet *pkt = rxb_addr(rxb);
650 if (le32_to_cpu(pkt->u.stats.flag) & UCODE_STATISTICS_CLEAR_MSK) {
651 #ifdef CONFIG_IWLWIFI_DEBUG
652 memset(&priv->accum_statistics, 0,
653 sizeof(struct iwl_notif_statistics));
654 memset(&priv->delta_statistics, 0,
655 sizeof(struct iwl_notif_statistics));
656 memset(&priv->max_delta, 0,
657 sizeof(struct iwl_notif_statistics));
659 IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
661 iwl_rx_statistics(priv, rxb);
663 EXPORT_SYMBOL(iwl_reply_statistics);
665 /* Calc max signal level (dBm) among 3 possible receivers */
666 static inline int iwl_calc_rssi(struct iwl_priv *priv,
667 struct iwl_rx_phy_res *rx_resp)
669 return priv->cfg->ops->utils->calc_rssi(priv, rx_resp);
672 #ifdef CONFIG_IWLWIFI_DEBUG
674 * iwl_dbg_report_frame - dump frame to syslog during debug sessions
676 * You may hack this function to show different aspects of received frames,
677 * including selective frame dumps.
678 * group100 parameter selects whether to show 1 out of 100 good data frames.
679 * All beacon and probe response frames are printed.
681 static void iwl_dbg_report_frame(struct iwl_priv *priv,
682 struct iwl_rx_phy_res *phy_res, u16 length,
683 struct ieee80211_hdr *header, int group100)
686 u32 print_summary = 0;
687 u32 print_dump = 0; /* set to 1 to dump all frames' contents */
698 if (likely(!(iwl_get_debug_level(priv) & IWL_DL_RX)))
702 fc = header->frame_control;
703 seq_ctl = le16_to_cpu(header->seq_ctrl);
706 channel = le16_to_cpu(phy_res->channel);
707 phy_flags = le16_to_cpu(phy_res->phy_flags);
708 rate_n_flags = le32_to_cpu(phy_res->rate_n_flags);
710 /* signal statistics */
711 rssi = iwl_calc_rssi(priv, phy_res);
712 tsf_low = le64_to_cpu(phy_res->timestamp) & 0x0ffffffff;
714 to_us = !compare_ether_addr(header->addr1, priv->mac_addr);
716 /* if data frame is to us and all is good,
717 * (optionally) print summary for only 1 out of every 100 */
718 if (to_us && (fc & ~cpu_to_le16(IEEE80211_FCTL_PROTECTED)) ==
719 cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FTYPE_DATA)) {
722 print_summary = 1; /* print each frame */
723 else if (priv->framecnt_to_us < 100) {
724 priv->framecnt_to_us++;
727 priv->framecnt_to_us = 0;
732 /* print summary for all other frames */
743 else if (ieee80211_has_retry(fc))
745 else if (ieee80211_is_assoc_resp(fc))
747 else if (ieee80211_is_reassoc_resp(fc))
749 else if (ieee80211_is_probe_resp(fc)) {
751 print_dump = 1; /* dump frame contents */
752 } else if (ieee80211_is_beacon(fc)) {
754 print_dump = 1; /* dump frame contents */
755 } else if (ieee80211_is_atim(fc))
757 else if (ieee80211_is_auth(fc))
759 else if (ieee80211_is_deauth(fc))
761 else if (ieee80211_is_disassoc(fc))
766 rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
767 if (unlikely((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT))) {
771 bitrate = iwl_rates[rate_idx].ieee / 2;
774 /* print frame summary.
775 * MAC addresses show just the last byte (for brevity),
776 * but you can hack it to show more, if you'd like to. */
778 IWL_DEBUG_RX(priv, "%s: mhd=0x%04x, dst=0x%02x, "
779 "len=%u, rssi=%d, chnl=%d, rate=%u, \n",
780 title, le16_to_cpu(fc), header->addr1[5],
781 length, rssi, channel, bitrate);
783 /* src/dst addresses assume managed mode */
784 IWL_DEBUG_RX(priv, "%s: 0x%04x, dst=0x%02x, src=0x%02x, "
785 "len=%u, rssi=%d, tim=%lu usec, "
786 "phy=0x%02x, chnl=%d\n",
787 title, le16_to_cpu(fc), header->addr1[5],
788 header->addr3[5], length, rssi,
789 tsf_low - priv->scan_start_tsf,
794 iwl_print_hex_dump(priv, IWL_DL_RX, header, length);
799 * returns non-zero if packet should be dropped
801 int iwl_set_decrypted_flag(struct iwl_priv *priv,
802 struct ieee80211_hdr *hdr,
804 struct ieee80211_rx_status *stats)
806 u16 fc = le16_to_cpu(hdr->frame_control);
808 if (priv->active_rxon.filter_flags & RXON_FILTER_DIS_DECRYPT_MSK)
811 if (!(fc & IEEE80211_FCTL_PROTECTED))
814 IWL_DEBUG_RX(priv, "decrypt_res:0x%x\n", decrypt_res);
815 switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
816 case RX_RES_STATUS_SEC_TYPE_TKIP:
817 /* The uCode has got a bad phase 1 Key, pushes the packet.
818 * Decryption will be done in SW. */
819 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
820 RX_RES_STATUS_BAD_KEY_TTAK)
823 case RX_RES_STATUS_SEC_TYPE_WEP:
824 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
825 RX_RES_STATUS_BAD_ICV_MIC) {
826 /* bad ICV, the packet is destroyed since the
827 * decryption is inplace, drop it */
828 IWL_DEBUG_RX(priv, "Packet destroyed\n");
831 case RX_RES_STATUS_SEC_TYPE_CCMP:
832 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
833 RX_RES_STATUS_DECRYPT_OK) {
834 IWL_DEBUG_RX(priv, "hw decrypt successfully!!!\n");
835 stats->flag |= RX_FLAG_DECRYPTED;
844 EXPORT_SYMBOL(iwl_set_decrypted_flag);
846 static u32 iwl_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
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);
855 decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
857 /* packet was not encrypted */
858 if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
859 RX_RES_STATUS_SEC_TYPE_NONE)
862 /* packet was encrypted with unknown alg */
863 if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
864 RX_RES_STATUS_SEC_TYPE_ERR)
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)
872 switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
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))
878 decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
880 decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
884 case RX_RES_STATUS_SEC_TYPE_TKIP:
885 if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
887 decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
890 /* fall through if TTAK OK */
892 if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
893 decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
895 decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
899 IWL_DEBUG_RX(priv, "decrypt_in:0x%x decrypt_out = 0x%x\n",
900 decrypt_in, decrypt_out);
905 static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
906 struct ieee80211_hdr *hdr,
909 struct iwl_rx_mem_buffer *rxb,
910 struct ieee80211_rx_status *stats)
914 __le16 fc = hdr->frame_control;
916 /* We only process data packets if the interface is open */
917 if (unlikely(!priv->is_open)) {
918 IWL_DEBUG_DROP_LIMIT(priv,
919 "Dropping packet while interface is not open.\n");
923 /* In case of HW accelerated crypto and bad decryption, drop */
924 if (!priv->cfg->mod_params->sw_crypto &&
925 iwl_set_decrypted_flag(priv, hdr, ampdu_status, stats))
928 skb = alloc_skb(IWL_LINK_HDR_MAX * 2, GFP_ATOMIC);
930 IWL_ERR(priv, "alloc_skb failed\n");
934 skb_reserve(skb, IWL_LINK_HDR_MAX);
935 skb_add_rx_frag(skb, 0, rxb->page, (void *)hdr - rxb_addr(rxb), len);
937 /* mac80211 currently doesn't support paged SKB. Convert it to
938 * linear SKB for management frame and data frame requires
939 * software decryption or software defragementation. */
940 if (ieee80211_is_mgmt(fc) ||
941 ieee80211_has_protected(fc) ||
942 ieee80211_has_morefrags(fc) ||
943 le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG)
944 ret = skb_linearize(skb);
946 ret = __pskb_pull_tail(skb, min_t(u16, IWL_LINK_HDR_MAX, len)) ?
955 * XXX: We cannot touch the page and its virtual memory (hdr) after
956 * here. It might have already been freed by the above skb change.
959 iwl_update_stats(priv, false, fc, len);
960 memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
962 ieee80211_rx(priv->hw, skb);
964 priv->alloc_rxb_page--;
968 /* This is necessary only for a number of statistics, see the caller. */
969 static int iwl_is_network_packet(struct iwl_priv *priv,
970 struct ieee80211_hdr *header)
972 /* Filter incoming packets to determine if they are targeted toward
973 * this network, discarding packets coming from ourselves */
974 switch (priv->iw_mode) {
975 case NL80211_IFTYPE_ADHOC: /* Header: Dest. | Source | BSSID */
976 /* packets to our IBSS update information */
977 return !compare_ether_addr(header->addr3, priv->bssid);
978 case NL80211_IFTYPE_STATION: /* Header: Dest. | AP{BSSID} | Source */
979 /* packets to our IBSS update information */
980 return !compare_ether_addr(header->addr2, priv->bssid);
986 /* Called for REPLY_RX (legacy ABG frames), or
987 * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
988 void iwl_rx_reply_rx(struct iwl_priv *priv,
989 struct iwl_rx_mem_buffer *rxb)
991 struct ieee80211_hdr *header;
992 struct ieee80211_rx_status rx_status;
993 struct iwl_rx_packet *pkt = rxb_addr(rxb);
994 struct iwl_rx_phy_res *phy_res;
995 __le32 rx_pkt_status;
996 struct iwl4965_rx_mpdu_res_start *amsdu;
1002 * REPLY_RX and REPLY_RX_MPDU_CMD are handled differently.
1003 * REPLY_RX: physical layer info is in this buffer
1004 * REPLY_RX_MPDU_CMD: physical layer info was sent in separate
1005 * command and cached in priv->last_phy_res
1007 * Here we set up local variables depending on which command is
1010 if (pkt->hdr.cmd == REPLY_RX) {
1011 phy_res = (struct iwl_rx_phy_res *)pkt->u.raw;
1012 header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*phy_res)
1013 + phy_res->cfg_phy_cnt);
1015 len = le16_to_cpu(phy_res->byte_count);
1016 rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*phy_res) +
1017 phy_res->cfg_phy_cnt + len);
1018 ampdu_status = le32_to_cpu(rx_pkt_status);
1020 if (!priv->last_phy_res[0]) {
1021 IWL_ERR(priv, "MPDU frame without cached PHY data\n");
1024 phy_res = (struct iwl_rx_phy_res *)&priv->last_phy_res[1];
1025 amsdu = (struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;
1026 header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*amsdu));
1027 len = le16_to_cpu(amsdu->byte_count);
1028 rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*amsdu) + len);
1029 ampdu_status = iwl_translate_rx_status(priv,
1030 le32_to_cpu(rx_pkt_status));
1033 if ((unlikely(phy_res->cfg_phy_cnt > 20))) {
1034 IWL_DEBUG_DROP(priv, "dsp size out of range [0,20]: %d/n",
1035 phy_res->cfg_phy_cnt);
1039 if (!(rx_pkt_status & RX_RES_STATUS_NO_CRC32_ERROR) ||
1040 !(rx_pkt_status & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
1041 IWL_DEBUG_RX(priv, "Bad CRC or FIFO: 0x%08X.\n",
1042 le32_to_cpu(rx_pkt_status));
1046 /* This will be used in several places later */
1047 rate_n_flags = le32_to_cpu(phy_res->rate_n_flags);
1049 /* rx_status carries information about the packet to mac80211 */
1050 rx_status.mactime = le64_to_cpu(phy_res->timestamp);
1052 ieee80211_channel_to_frequency(le16_to_cpu(phy_res->channel));
1053 rx_status.band = (phy_res->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
1054 IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
1055 rx_status.rate_idx =
1056 iwl_hwrate_to_mac80211_idx(rate_n_flags, rx_status.band);
1059 /* TSF isn't reliable. In order to allow smooth user experience,
1060 * this W/A doesn't propagate it to the mac80211 */
1061 /*rx_status.flag |= RX_FLAG_TSFT;*/
1063 priv->ucode_beacon_time = le32_to_cpu(phy_res->beacon_time_stamp);
1065 /* Find max signal strength (dBm) among 3 antenna/receiver chains */
1066 rx_status.signal = iwl_calc_rssi(priv, phy_res);
1068 /* Meaningful noise values are available only from beacon statistics,
1069 * which are gathered only when associated, and indicate noise
1070 * only for the associated network channel ...
1071 * Ignore these noise values while scanning (other channels) */
1072 if (iwl_is_associated(priv) &&
1073 !test_bit(STATUS_SCANNING, &priv->status)) {
1074 rx_status.noise = priv->last_rx_noise;
1076 rx_status.noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
1079 /* Reset beacon noise level if not associated. */
1080 if (!iwl_is_associated(priv))
1081 priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
1083 #ifdef CONFIG_IWLWIFI_DEBUG
1084 /* Set "1" to report good data frames in groups of 100 */
1085 if (unlikely(iwl_get_debug_level(priv) & IWL_DL_RX))
1086 iwl_dbg_report_frame(priv, phy_res, len, header, 1);
1088 iwl_dbg_log_rx_data_frame(priv, len, header);
1089 IWL_DEBUG_STATS_LIMIT(priv, "Rssi %d, noise %d, TSF %llu\n",
1090 rx_status.signal, rx_status.noise,
1091 (unsigned long long)rx_status.mactime);
1096 * It seems that the antenna field in the phy flags value
1097 * is actually a bit field. This is undefined by radiotap,
1098 * it wants an actual antenna number but I always get "7"
1099 * for most legacy frames I receive indicating that the
1100 * same frame was received on all three RX chains.
1102 * I think this field should be removed in favor of a
1103 * new 802.11n radiotap field "RX chains" that is defined
1107 (le16_to_cpu(phy_res->phy_flags) & RX_RES_PHY_FLAGS_ANTENNA_MSK)
1108 >> RX_RES_PHY_FLAGS_ANTENNA_POS;
1110 /* set the preamble flag if appropriate */
1111 if (phy_res->phy_flags & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK)
1112 rx_status.flag |= RX_FLAG_SHORTPRE;
1114 /* Set up the HT phy flags */
1115 if (rate_n_flags & RATE_MCS_HT_MSK)
1116 rx_status.flag |= RX_FLAG_HT;
1117 if (rate_n_flags & RATE_MCS_HT40_MSK)
1118 rx_status.flag |= RX_FLAG_40MHZ;
1119 if (rate_n_flags & RATE_MCS_SGI_MSK)
1120 rx_status.flag |= RX_FLAG_SHORT_GI;
1122 if (iwl_is_network_packet(priv, header)) {
1123 priv->last_rx_rssi = rx_status.signal;
1124 priv->last_beacon_time = priv->ucode_beacon_time;
1125 priv->last_tsf = le64_to_cpu(phy_res->timestamp);
1128 iwl_pass_packet_to_mac80211(priv, header, len, ampdu_status,
1131 EXPORT_SYMBOL(iwl_rx_reply_rx);
1133 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
1134 * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
1135 void iwl_rx_reply_rx_phy(struct iwl_priv *priv,
1136 struct iwl_rx_mem_buffer *rxb)
1138 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1139 priv->last_phy_res[0] = 1;
1140 memcpy(&priv->last_phy_res[1], &(pkt->u.raw[0]),
1141 sizeof(struct iwl_rx_phy_res));
1143 EXPORT_SYMBOL(iwl_rx_reply_rx_phy);