1 /******************************************************************************
3 * Copyright(c) 2003 - 2009 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_set_bit(priv, CSR_GP_CNTRL,
144 CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
148 q->write_actual = (q->write & ~0x7);
149 iwl_write_direct32(priv, rx_wrt_ptr_reg, q->write_actual);
151 /* Else device is assumed to be awake */
153 /* Device expects a multiple of 8 */
154 q->write_actual = (q->write & ~0x7);
155 iwl_write_direct32(priv, rx_wrt_ptr_reg, q->write_actual);
161 spin_unlock_irqrestore(&q->lock, flags);
164 EXPORT_SYMBOL(iwl_rx_queue_update_write_ptr);
166 * iwl_dma_addr2rbd_ptr - convert a DMA address to a uCode read buffer ptr
168 static inline __le32 iwl_dma_addr2rbd_ptr(struct iwl_priv *priv,
171 return cpu_to_le32((u32)(dma_addr >> 8));
175 * iwl_rx_queue_restock - refill RX queue from pre-allocated pool
177 * If there are slots in the RX queue that need to be restocked,
178 * and we have free pre-allocated buffers, fill the ranks as much
179 * as we can, pulling from rx_free.
181 * This moves the 'write' index forward to catch up with 'processed', and
182 * also updates the memory address in the firmware to reference the new
185 int iwl_rx_queue_restock(struct iwl_priv *priv)
187 struct iwl_rx_queue *rxq = &priv->rxq;
188 struct list_head *element;
189 struct iwl_rx_mem_buffer *rxb;
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);
202 /* Point to Rx buffer via next RBD in circular buffer */
203 rxq->bd[rxq->write] = iwl_dma_addr2rbd_ptr(priv, rxb->aligned_dma_addr);
204 rxq->queue[rxq->write] = rxb;
205 rxq->write = (rxq->write + 1) & RX_QUEUE_MASK;
208 spin_unlock_irqrestore(&rxq->lock, flags);
209 /* If the pre-allocated buffer pool is dropping low, schedule to
211 if (rxq->free_count <= RX_LOW_WATERMARK)
212 queue_work(priv->workqueue, &priv->rx_replenish);
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 ret = iwl_rx_queue_update_write_ptr(priv, rxq);
226 EXPORT_SYMBOL(iwl_rx_queue_restock);
230 * iwl_rx_replenish - Move all used packet from rx_used to rx_free
232 * When moving to rx_free an SKB is allocated for the slot.
234 * Also restock the Rx queue via iwl_rx_queue_restock.
235 * This is called as a scheduled work item (except for during initialization)
237 void iwl_rx_allocate(struct iwl_priv *priv, gfp_t priority)
239 struct iwl_rx_queue *rxq = &priv->rxq;
240 struct list_head *element;
241 struct iwl_rx_mem_buffer *rxb;
245 spin_lock_irqsave(&rxq->lock, flags);
247 if (list_empty(&rxq->rx_used)) {
248 spin_unlock_irqrestore(&rxq->lock, flags);
251 element = rxq->rx_used.next;
252 rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
255 spin_unlock_irqrestore(&rxq->lock, flags);
257 /* Alloc a new receive buffer */
258 rxb->skb = alloc_skb(priv->hw_params.rx_buf_size + 256,
262 IWL_CRIT(priv, "Can not allocate SKB buffers\n");
263 /* We don't reschedule replenish work here -- we will
264 * call the restock method and if it still needs
265 * more buffers it will schedule replenish */
269 /* Get physical address of RB/SKB */
270 rxb->real_dma_addr = pci_map_single(
273 priv->hw_params.rx_buf_size + 256,
275 /* dma address must be no more than 36 bits */
276 BUG_ON(rxb->real_dma_addr & ~DMA_BIT_MASK(36));
277 /* and also 256 byte aligned! */
278 rxb->aligned_dma_addr = ALIGN(rxb->real_dma_addr, 256);
279 skb_reserve(rxb->skb, rxb->aligned_dma_addr - rxb->real_dma_addr);
281 spin_lock_irqsave(&rxq->lock, flags);
283 list_add_tail(&rxb->list, &rxq->rx_free);
285 priv->alloc_rxb_skb++;
287 spin_unlock_irqrestore(&rxq->lock, flags);
291 void iwl_rx_replenish(struct iwl_priv *priv)
295 iwl_rx_allocate(priv, GFP_KERNEL);
297 spin_lock_irqsave(&priv->lock, flags);
298 iwl_rx_queue_restock(priv);
299 spin_unlock_irqrestore(&priv->lock, flags);
301 EXPORT_SYMBOL(iwl_rx_replenish);
303 void iwl_rx_replenish_now(struct iwl_priv *priv)
305 iwl_rx_allocate(priv, GFP_ATOMIC);
307 iwl_rx_queue_restock(priv);
309 EXPORT_SYMBOL(iwl_rx_replenish_now);
312 /* Assumes that the skb field of the buffers in 'pool' is kept accurate.
313 * If an SKB has been detached, the POOL needs to have its SKB set to NULL
314 * This free routine walks the list of POOL entries and if SKB is set to
315 * non NULL it is unmapped and freed
317 void iwl_rx_queue_free(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
320 for (i = 0; i < RX_QUEUE_SIZE + RX_FREE_BUFFERS; i++) {
321 if (rxq->pool[i].skb != NULL) {
322 pci_unmap_single(priv->pci_dev,
323 rxq->pool[i].real_dma_addr,
324 priv->hw_params.rx_buf_size + 256,
326 dev_kfree_skb(rxq->pool[i].skb);
330 pci_free_consistent(priv->pci_dev, 4 * RX_QUEUE_SIZE, rxq->bd,
332 pci_free_consistent(priv->pci_dev, sizeof(struct iwl_rb_status),
333 rxq->rb_stts, rxq->rb_stts_dma);
337 EXPORT_SYMBOL(iwl_rx_queue_free);
339 int iwl_rx_queue_alloc(struct iwl_priv *priv)
341 struct iwl_rx_queue *rxq = &priv->rxq;
342 struct pci_dev *dev = priv->pci_dev;
345 spin_lock_init(&rxq->lock);
346 INIT_LIST_HEAD(&rxq->rx_free);
347 INIT_LIST_HEAD(&rxq->rx_used);
349 /* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */
350 rxq->bd = pci_alloc_consistent(dev, 4 * RX_QUEUE_SIZE, &rxq->dma_addr);
354 rxq->rb_stts = pci_alloc_consistent(dev, sizeof(struct iwl_rb_status),
359 /* Fill the rx_used queue with _all_ of the Rx buffers */
360 for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++)
361 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
363 /* Set us so that we have processed and used all buffers, but have
364 * not restocked the Rx queue with fresh buffers */
365 rxq->read = rxq->write = 0;
366 rxq->write_actual = 0;
368 rxq->need_update = 0;
372 pci_free_consistent(priv->pci_dev, 4 * RX_QUEUE_SIZE, rxq->bd,
377 EXPORT_SYMBOL(iwl_rx_queue_alloc);
379 void iwl_rx_queue_reset(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
383 spin_lock_irqsave(&rxq->lock, flags);
384 INIT_LIST_HEAD(&rxq->rx_free);
385 INIT_LIST_HEAD(&rxq->rx_used);
386 /* Fill the rx_used queue with _all_ of the Rx buffers */
387 for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++) {
388 /* In the reset function, these buffers may have been allocated
389 * to an SKB, so we need to unmap and free potential storage */
390 if (rxq->pool[i].skb != NULL) {
391 pci_unmap_single(priv->pci_dev,
392 rxq->pool[i].real_dma_addr,
393 priv->hw_params.rx_buf_size + 256,
395 priv->alloc_rxb_skb--;
396 dev_kfree_skb(rxq->pool[i].skb);
397 rxq->pool[i].skb = NULL;
399 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
402 /* Set us so that we have processed and used all buffers, but have
403 * not restocked the Rx queue with fresh buffers */
404 rxq->read = rxq->write = 0;
405 rxq->write_actual = 0;
407 spin_unlock_irqrestore(&rxq->lock, flags);
409 EXPORT_SYMBOL(iwl_rx_queue_reset);
411 int iwl_rx_init(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
414 const u32 rfdnlog = RX_QUEUE_SIZE_LOG; /* 256 RBDs */
415 const u32 rb_timeout = 0; /* FIXME: RX_RB_TIMEOUT why this stalls RX */
417 if (priv->cfg->mod_params->amsdu_size_8K)
418 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K;
420 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K;
423 iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
425 /* Reset driver's Rx queue write index */
426 iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_WPTR_REG, 0);
428 /* Tell device where to find RBD circular buffer in DRAM */
429 iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_BASE_REG,
430 (u32)(rxq->dma_addr >> 8));
432 /* Tell device where in DRAM to update its Rx status */
433 iwl_write_direct32(priv, FH_RSCSR_CHNL0_STTS_WPTR_REG,
434 rxq->rb_stts_dma >> 4);
437 * FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY is set because of HW bug in
438 * the credit mechanism in 5000 HW RX FIFO
439 * Direct rx interrupts to hosts
440 * Rx buffer size 4 or 8k
444 iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG,
445 FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL |
446 FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY |
447 FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL |
448 FH_RCSR_CHNL0_RX_CONFIG_SINGLE_FRAME_MSK |
450 (rb_timeout << FH_RCSR_RX_CONFIG_REG_IRQ_RBTH_POS)|
451 (rfdnlog << FH_RCSR_RX_CONFIG_RBDCB_SIZE_POS));
453 iwl_write32(priv, CSR_INT_COALESCING, 0x40);
458 int iwl_rxq_stop(struct iwl_priv *priv)
462 iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
463 iwl_poll_direct_bit(priv, FH_MEM_RSSR_RX_STATUS_REG,
464 FH_RSSR_CHNL0_RX_STATUS_CHNL_IDLE, 1000);
468 EXPORT_SYMBOL(iwl_rxq_stop);
470 void iwl_rx_missed_beacon_notif(struct iwl_priv *priv,
471 struct iwl_rx_mem_buffer *rxb)
474 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
475 struct iwl_missed_beacon_notif *missed_beacon;
477 missed_beacon = &pkt->u.missed_beacon;
478 if (le32_to_cpu(missed_beacon->consequtive_missed_beacons) > 5) {
479 IWL_DEBUG_CALIB(priv, "missed bcn cnsq %d totl %d rcd %d expctd %d\n",
480 le32_to_cpu(missed_beacon->consequtive_missed_beacons),
481 le32_to_cpu(missed_beacon->total_missed_becons),
482 le32_to_cpu(missed_beacon->num_recvd_beacons),
483 le32_to_cpu(missed_beacon->num_expected_beacons));
484 if (!test_bit(STATUS_SCANNING, &priv->status))
485 iwl_init_sensitivity(priv);
488 EXPORT_SYMBOL(iwl_rx_missed_beacon_notif);
491 /* Calculate noise level, based on measurements during network silence just
492 * before arriving beacon. This measurement can be done only if we know
493 * exactly when to expect beacons, therefore only when we're associated. */
494 static void iwl_rx_calc_noise(struct iwl_priv *priv)
496 struct statistics_rx_non_phy *rx_info
497 = &(priv->statistics.rx.general);
498 int num_active_rx = 0;
499 int total_silence = 0;
501 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
503 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
505 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
508 total_silence += bcn_silence_a;
512 total_silence += bcn_silence_b;
516 total_silence += bcn_silence_c;
520 /* Average among active antennas */
522 priv->last_rx_noise = (total_silence / num_active_rx) - 107;
524 priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
526 IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n",
527 bcn_silence_a, bcn_silence_b, bcn_silence_c,
528 priv->last_rx_noise);
531 #define REG_RECALIB_PERIOD (60)
533 void iwl_rx_statistics(struct iwl_priv *priv,
534 struct iwl_rx_mem_buffer *rxb)
537 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
539 IWL_DEBUG_RX(priv, "Statistics notification received (%d vs %d).\n",
540 (int)sizeof(priv->statistics), pkt->len);
542 change = ((priv->statistics.general.temperature !=
543 pkt->u.stats.general.temperature) ||
544 ((priv->statistics.flag &
545 STATISTICS_REPLY_FLG_FAT_MODE_MSK) !=
546 (pkt->u.stats.flag & STATISTICS_REPLY_FLG_FAT_MODE_MSK)));
548 memcpy(&priv->statistics, &pkt->u.stats, sizeof(priv->statistics));
550 set_bit(STATUS_STATISTICS, &priv->status);
552 /* Reschedule the statistics timer to occur in
553 * REG_RECALIB_PERIOD seconds to ensure we get a
554 * thermal update even if the uCode doesn't give
556 mod_timer(&priv->statistics_periodic, jiffies +
557 msecs_to_jiffies(REG_RECALIB_PERIOD * 1000));
559 if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
560 (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
561 iwl_rx_calc_noise(priv);
562 queue_work(priv->workqueue, &priv->run_time_calib_work);
565 iwl_leds_background(priv);
567 if (priv->cfg->ops->lib->temp_ops.temperature && change)
568 priv->cfg->ops->lib->temp_ops.temperature(priv);
570 EXPORT_SYMBOL(iwl_rx_statistics);
572 #define PERFECT_RSSI (-20) /* dBm */
573 #define WORST_RSSI (-95) /* dBm */
574 #define RSSI_RANGE (PERFECT_RSSI - WORST_RSSI)
576 /* Calculate an indication of rx signal quality (a percentage, not dBm!).
577 * See http://www.ces.clemson.edu/linux/signal_quality.shtml for info
578 * about formulas used below. */
579 static int iwl_calc_sig_qual(int rssi_dbm, int noise_dbm)
582 int degradation = PERFECT_RSSI - rssi_dbm;
584 /* If we get a noise measurement, use signal-to-noise ratio (SNR)
585 * as indicator; formula is (signal dbm - noise dbm).
586 * SNR at or above 40 is a great signal (100%).
587 * Below that, scale to fit SNR of 0 - 40 dB within 0 - 100% indicator.
588 * Weakest usable signal is usually 10 - 15 dB SNR. */
590 if (rssi_dbm - noise_dbm >= 40)
592 else if (rssi_dbm < noise_dbm)
594 sig_qual = ((rssi_dbm - noise_dbm) * 5) / 2;
596 /* Else use just the signal level.
597 * This formula is a least squares fit of data points collected and
598 * compared with a reference system that had a percentage (%) display
599 * for signal quality. */
601 sig_qual = (100 * (RSSI_RANGE * RSSI_RANGE) - degradation *
602 (15 * RSSI_RANGE + 62 * degradation)) /
603 (RSSI_RANGE * RSSI_RANGE);
607 else if (sig_qual < 1)
613 /* Calc max signal level (dBm) among 3 possible receivers */
614 static inline int iwl_calc_rssi(struct iwl_priv *priv,
615 struct iwl_rx_phy_res *rx_resp)
617 return priv->cfg->ops->utils->calc_rssi(priv, rx_resp);
620 #ifdef CONFIG_IWLWIFI_DEBUG
622 * iwl_dbg_report_frame - dump frame to syslog during debug sessions
624 * You may hack this function to show different aspects of received frames,
625 * including selective frame dumps.
626 * group100 parameter selects whether to show 1 out of 100 good data frames.
627 * All beacon and probe response frames are printed.
629 static void iwl_dbg_report_frame(struct iwl_priv *priv,
630 struct iwl_rx_phy_res *phy_res, u16 length,
631 struct ieee80211_hdr *header, int group100)
634 u32 print_summary = 0;
635 u32 print_dump = 0; /* set to 1 to dump all frames' contents */
646 if (likely(!(priv->debug_level & IWL_DL_RX)))
650 fc = header->frame_control;
651 seq_ctl = le16_to_cpu(header->seq_ctrl);
654 channel = le16_to_cpu(phy_res->channel);
655 phy_flags = le16_to_cpu(phy_res->phy_flags);
656 rate_n_flags = le32_to_cpu(phy_res->rate_n_flags);
658 /* signal statistics */
659 rssi = iwl_calc_rssi(priv, phy_res);
660 tsf_low = le64_to_cpu(phy_res->timestamp) & 0x0ffffffff;
662 to_us = !compare_ether_addr(header->addr1, priv->mac_addr);
664 /* if data frame is to us and all is good,
665 * (optionally) print summary for only 1 out of every 100 */
666 if (to_us && (fc & ~cpu_to_le16(IEEE80211_FCTL_PROTECTED)) ==
667 cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FTYPE_DATA)) {
670 print_summary = 1; /* print each frame */
671 else if (priv->framecnt_to_us < 100) {
672 priv->framecnt_to_us++;
675 priv->framecnt_to_us = 0;
680 /* print summary for all other frames */
691 else if (ieee80211_has_retry(fc))
693 else if (ieee80211_is_assoc_resp(fc))
695 else if (ieee80211_is_reassoc_resp(fc))
697 else if (ieee80211_is_probe_resp(fc)) {
699 print_dump = 1; /* dump frame contents */
700 } else if (ieee80211_is_beacon(fc)) {
702 print_dump = 1; /* dump frame contents */
703 } else if (ieee80211_is_atim(fc))
705 else if (ieee80211_is_auth(fc))
707 else if (ieee80211_is_deauth(fc))
709 else if (ieee80211_is_disassoc(fc))
714 rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
715 if (unlikely((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT))) {
719 bitrate = iwl_rates[rate_idx].ieee / 2;
722 /* print frame summary.
723 * MAC addresses show just the last byte (for brevity),
724 * but you can hack it to show more, if you'd like to. */
726 IWL_DEBUG_RX(priv, "%s: mhd=0x%04x, dst=0x%02x, "
727 "len=%u, rssi=%d, chnl=%d, rate=%u, \n",
728 title, le16_to_cpu(fc), header->addr1[5],
729 length, rssi, channel, bitrate);
731 /* src/dst addresses assume managed mode */
732 IWL_DEBUG_RX(priv, "%s: 0x%04x, dst=0x%02x, src=0x%02x, "
733 "len=%u, rssi=%d, tim=%lu usec, "
734 "phy=0x%02x, chnl=%d\n",
735 title, le16_to_cpu(fc), header->addr1[5],
736 header->addr3[5], length, rssi,
737 tsf_low - priv->scan_start_tsf,
742 iwl_print_hex_dump(priv, IWL_DL_RX, header, length);
746 static void iwl_update_rx_stats(struct iwl_priv *priv, u16 fc, u16 len)
748 /* 0 - mgmt, 1 - cnt, 2 - data */
749 int idx = (fc & IEEE80211_FCTL_FTYPE) >> 2;
750 priv->rx_stats[idx].cnt++;
751 priv->rx_stats[idx].bytes += len;
755 * returns non-zero if packet should be dropped
757 int iwl_set_decrypted_flag(struct iwl_priv *priv,
758 struct ieee80211_hdr *hdr,
760 struct ieee80211_rx_status *stats)
762 u16 fc = le16_to_cpu(hdr->frame_control);
764 if (priv->active_rxon.filter_flags & RXON_FILTER_DIS_DECRYPT_MSK)
767 if (!(fc & IEEE80211_FCTL_PROTECTED))
770 IWL_DEBUG_RX(priv, "decrypt_res:0x%x\n", decrypt_res);
771 switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
772 case RX_RES_STATUS_SEC_TYPE_TKIP:
773 /* The uCode has got a bad phase 1 Key, pushes the packet.
774 * Decryption will be done in SW. */
775 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
776 RX_RES_STATUS_BAD_KEY_TTAK)
779 case RX_RES_STATUS_SEC_TYPE_WEP:
780 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
781 RX_RES_STATUS_BAD_ICV_MIC) {
782 /* bad ICV, the packet is destroyed since the
783 * decryption is inplace, drop it */
784 IWL_DEBUG_RX(priv, "Packet destroyed\n");
787 case RX_RES_STATUS_SEC_TYPE_CCMP:
788 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
789 RX_RES_STATUS_DECRYPT_OK) {
790 IWL_DEBUG_RX(priv, "hw decrypt successfully!!!\n");
791 stats->flag |= RX_FLAG_DECRYPTED;
800 EXPORT_SYMBOL(iwl_set_decrypted_flag);
802 static u32 iwl_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
806 if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
807 RX_RES_STATUS_STATION_FOUND)
808 decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
809 RX_RES_STATUS_NO_STATION_INFO_MISMATCH);
811 decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
813 /* packet was not encrypted */
814 if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
815 RX_RES_STATUS_SEC_TYPE_NONE)
818 /* packet was encrypted with unknown alg */
819 if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
820 RX_RES_STATUS_SEC_TYPE_ERR)
823 /* decryption was not done in HW */
824 if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
825 RX_MPDU_RES_STATUS_DEC_DONE_MSK)
828 switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
830 case RX_RES_STATUS_SEC_TYPE_CCMP:
831 /* alg is CCM: check MIC only */
832 if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
834 decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
836 decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
840 case RX_RES_STATUS_SEC_TYPE_TKIP:
841 if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
843 decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
846 /* fall through if TTAK OK */
848 if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
849 decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
851 decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
855 IWL_DEBUG_RX(priv, "decrypt_in:0x%x decrypt_out = 0x%x\n",
856 decrypt_in, decrypt_out);
861 static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
863 struct iwl_rx_mem_buffer *rxb,
864 struct ieee80211_rx_status *stats)
866 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
867 struct iwl_rx_phy_res *rx_start = (include_phy) ?
868 (struct iwl_rx_phy_res *)&(pkt->u.raw[0]) : NULL;
869 struct ieee80211_hdr *hdr;
874 u32 ampdu_status_legacy;
876 if (!include_phy && priv->last_phy_res[0])
877 rx_start = (struct iwl_rx_phy_res *)&priv->last_phy_res[1];
880 IWL_ERR(priv, "MPDU frame without a PHY data\n");
884 hdr = (struct ieee80211_hdr *)((u8 *) &rx_start[1] +
885 rx_start->cfg_phy_cnt);
887 len = le16_to_cpu(rx_start->byte_count);
889 rx_end = (__le32 *)((u8 *) &pkt->u.raw[0] +
890 sizeof(struct iwl_rx_phy_res) +
891 rx_start->cfg_phy_cnt + len);
894 struct iwl4965_rx_mpdu_res_start *amsdu =
895 (struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;
897 hdr = (struct ieee80211_hdr *)(pkt->u.raw +
898 sizeof(struct iwl4965_rx_mpdu_res_start));
899 len = le16_to_cpu(amsdu->byte_count);
900 rx_start->byte_count = amsdu->byte_count;
901 rx_end = (__le32 *) (((u8 *) hdr) + len);
904 ampdu_status = le32_to_cpu(*rx_end);
905 skblen = ((u8 *) rx_end - (u8 *) &pkt->u.raw[0]) + sizeof(u32);
908 /* New status scheme, need to translate */
909 ampdu_status_legacy = ampdu_status;
910 ampdu_status = iwl_translate_rx_status(priv, ampdu_status);
914 skb_reserve(rxb->skb, (void *)hdr - (void *)pkt);
915 skb_put(rxb->skb, len); /* end where data ends */
917 /* We only process data packets if the interface is open */
918 if (unlikely(!priv->is_open)) {
919 IWL_DEBUG_DROP_LIMIT(priv,
920 "Dropping packet while interface is not open.\n");
924 hdr = (struct ieee80211_hdr *)rxb->skb->data;
926 /* in case of HW accelerated crypto and bad decryption, drop */
927 if (!priv->hw_params.sw_crypto &&
928 iwl_set_decrypted_flag(priv, hdr, ampdu_status, stats))
931 iwl_update_rx_stats(priv, le16_to_cpu(hdr->frame_control), len);
932 ieee80211_rx_irqsafe(priv->hw, rxb->skb, stats);
933 priv->alloc_rxb_skb--;
937 /* This is necessary only for a number of statistics, see the caller. */
938 static int iwl_is_network_packet(struct iwl_priv *priv,
939 struct ieee80211_hdr *header)
941 /* Filter incoming packets to determine if they are targeted toward
942 * this network, discarding packets coming from ourselves */
943 switch (priv->iw_mode) {
944 case NL80211_IFTYPE_ADHOC: /* Header: Dest. | Source | BSSID */
945 /* packets to our IBSS update information */
946 return !compare_ether_addr(header->addr3, priv->bssid);
947 case NL80211_IFTYPE_STATION: /* Header: Dest. | AP{BSSID} | Source */
948 /* packets to our IBSS update information */
949 return !compare_ether_addr(header->addr2, priv->bssid);
955 /* Called for REPLY_RX (legacy ABG frames), or
956 * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
957 void iwl_rx_reply_rx(struct iwl_priv *priv,
958 struct iwl_rx_mem_buffer *rxb)
960 struct ieee80211_hdr *header;
961 struct ieee80211_rx_status rx_status;
962 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
963 /* Use phy data (Rx signal strength, etc.) contained within
964 * this rx packet for legacy frames,
965 * or phy data cached from REPLY_RX_PHY_CMD for HT frames. */
966 int include_phy = (pkt->hdr.cmd == REPLY_RX);
967 struct iwl_rx_phy_res *rx_start = (include_phy) ?
968 (struct iwl_rx_phy_res *)&(pkt->u.raw[0]) :
969 (struct iwl_rx_phy_res *)&priv->last_phy_res[1];
971 unsigned int len = 0;
975 rx_status.mactime = le64_to_cpu(rx_start->timestamp);
977 ieee80211_channel_to_frequency(le16_to_cpu(rx_start->channel));
978 rx_status.band = (rx_start->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
979 IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
981 iwl_hwrate_to_plcp_idx(le32_to_cpu(rx_start->rate_n_flags));
982 if (rx_status.band == IEEE80211_BAND_5GHZ)
983 rx_status.rate_idx -= IWL_FIRST_OFDM_RATE;
987 /* TSF isn't reliable. In order to allow smooth user experience,
988 * this W/A doesn't propagate it to the mac80211 */
989 /*rx_status.flag |= RX_FLAG_TSFT;*/
991 if ((unlikely(rx_start->cfg_phy_cnt > 20))) {
992 IWL_DEBUG_DROP(priv, "dsp size out of range [0,20]: %d/n",
993 rx_start->cfg_phy_cnt);
998 if (priv->last_phy_res[0])
999 rx_start = (struct iwl_rx_phy_res *)
1000 &priv->last_phy_res[1];
1006 IWL_ERR(priv, "MPDU frame without a PHY data\n");
1011 header = (struct ieee80211_hdr *)((u8 *) &rx_start[1]
1012 + rx_start->cfg_phy_cnt);
1014 len = le16_to_cpu(rx_start->byte_count);
1015 rx_end = (__le32 *)(pkt->u.raw + rx_start->cfg_phy_cnt +
1016 sizeof(struct iwl_rx_phy_res) + len);
1018 struct iwl4965_rx_mpdu_res_start *amsdu =
1019 (struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;
1021 header = (void *)(pkt->u.raw +
1022 sizeof(struct iwl4965_rx_mpdu_res_start));
1023 len = le16_to_cpu(amsdu->byte_count);
1024 rx_end = (__le32 *) (pkt->u.raw +
1025 sizeof(struct iwl4965_rx_mpdu_res_start) + len);
1028 if (!(*rx_end & RX_RES_STATUS_NO_CRC32_ERROR) ||
1029 !(*rx_end & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
1030 IWL_DEBUG_RX(priv, "Bad CRC or FIFO: 0x%08X.\n",
1031 le32_to_cpu(*rx_end));
1035 priv->ucode_beacon_time = le32_to_cpu(rx_start->beacon_time_stamp);
1037 /* Find max signal strength (dBm) among 3 antenna/receiver chains */
1038 rx_status.signal = iwl_calc_rssi(priv, rx_start);
1040 /* Meaningful noise values are available only from beacon statistics,
1041 * which are gathered only when associated, and indicate noise
1042 * only for the associated network channel ...
1043 * Ignore these noise values while scanning (other channels) */
1044 if (iwl_is_associated(priv) &&
1045 !test_bit(STATUS_SCANNING, &priv->status)) {
1046 rx_status.noise = priv->last_rx_noise;
1047 rx_status.qual = iwl_calc_sig_qual(rx_status.signal,
1050 rx_status.noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
1051 rx_status.qual = iwl_calc_sig_qual(rx_status.signal, 0);
1054 /* Reset beacon noise level if not associated. */
1055 if (!iwl_is_associated(priv))
1056 priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
1058 /* Set "1" to report good data frames in groups of 100 */
1059 #ifdef CONFIG_IWLWIFI_DEBUG
1060 if (unlikely(priv->debug_level & IWL_DL_RX))
1061 iwl_dbg_report_frame(priv, rx_start, len, header, 1);
1063 IWL_DEBUG_STATS_LIMIT(priv, "Rssi %d, noise %d, qual %d, TSF %llu\n",
1064 rx_status.signal, rx_status.noise, rx_status.signal,
1065 (unsigned long long)rx_status.mactime);
1070 * It seems that the antenna field in the phy flags value
1071 * is actually a bit field. This is undefined by radiotap,
1072 * it wants an actual antenna number but I always get "7"
1073 * for most legacy frames I receive indicating that the
1074 * same frame was received on all three RX chains.
1076 * I think this field should be removed in favor of a
1077 * new 802.11n radiotap field "RX chains" that is defined
1080 rx_status.antenna = le16_to_cpu(rx_start->phy_flags &
1081 RX_RES_PHY_FLAGS_ANTENNA_MSK) >> 4;
1083 /* set the preamble flag if appropriate */
1084 if (rx_start->phy_flags & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK)
1085 rx_status.flag |= RX_FLAG_SHORTPRE;
1087 network_packet = iwl_is_network_packet(priv, header);
1088 if (network_packet) {
1089 priv->last_rx_rssi = rx_status.signal;
1090 priv->last_beacon_time = priv->ucode_beacon_time;
1091 priv->last_tsf = le64_to_cpu(rx_start->timestamp);
1094 fc = le16_to_cpu(header->frame_control);
1095 switch (fc & IEEE80211_FCTL_FTYPE) {
1096 case IEEE80211_FTYPE_MGMT:
1097 case IEEE80211_FTYPE_DATA:
1098 if (priv->iw_mode == NL80211_IFTYPE_AP)
1099 iwl_update_ps_mode(priv, fc & IEEE80211_FCTL_PM,
1103 iwl_pass_packet_to_mac80211(priv, include_phy, rxb,
1109 EXPORT_SYMBOL(iwl_rx_reply_rx);
1111 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
1112 * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
1113 void iwl_rx_reply_rx_phy(struct iwl_priv *priv,
1114 struct iwl_rx_mem_buffer *rxb)
1116 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
1117 priv->last_phy_res[0] = 1;
1118 memcpy(&priv->last_phy_res[1], &(pkt->u.raw[0]),
1119 sizeof(struct iwl_rx_phy_res));
1121 EXPORT_SYMBOL(iwl_rx_reply_rx_phy);