1 /******************************************************************************
3 * Copyright(c) 2003 - 2008 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 * James P. Ketrenos <ipw2100-admin@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)
132 spin_lock_irqsave(&q->lock, flags);
134 if (q->need_update == 0)
137 /* If power-saving is in use, make sure device is awake */
138 if (test_bit(STATUS_POWER_PMI, &priv->status)) {
139 reg = iwl_read32(priv, CSR_UCODE_DRV_GP1);
141 if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
142 iwl_set_bit(priv, CSR_GP_CNTRL,
143 CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
147 ret = iwl_grab_nic_access(priv);
151 /* Device expects a multiple of 8 */
152 iwl_write_direct32(priv, FH_RSCSR_CHNL0_WPTR,
154 iwl_release_nic_access(priv);
156 /* Else device is assumed to be awake */
158 /* Device expects a multiple of 8 */
159 iwl_write32(priv, FH_RSCSR_CHNL0_WPTR, q->write & ~0x7);
165 spin_unlock_irqrestore(&q->lock, flags);
168 EXPORT_SYMBOL(iwl_rx_queue_update_write_ptr);
170 * iwl_dma_addr2rbd_ptr - convert a DMA address to a uCode read buffer ptr
172 static inline __le32 iwl_dma_addr2rbd_ptr(struct iwl_priv *priv,
175 return cpu_to_le32((u32)(dma_addr >> 8));
179 * iwl_rx_queue_restock - refill RX queue from pre-allocated pool
181 * If there are slots in the RX queue that need to be restocked,
182 * and we have free pre-allocated buffers, fill the ranks as much
183 * as we can, pulling from rx_free.
185 * This moves the 'write' index forward to catch up with 'processed', and
186 * also updates the memory address in the firmware to reference the new
189 int iwl_rx_queue_restock(struct iwl_priv *priv)
191 struct iwl_rx_queue *rxq = &priv->rxq;
192 struct list_head *element;
193 struct iwl_rx_mem_buffer *rxb;
198 spin_lock_irqsave(&rxq->lock, flags);
199 write = rxq->write & ~0x7;
200 while ((iwl_rx_queue_space(rxq) > 0) && (rxq->free_count)) {
201 /* Get next free Rx buffer, remove from free list */
202 element = rxq->rx_free.next;
203 rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
206 /* Point to Rx buffer via next RBD in circular buffer */
207 rxq->bd[rxq->write] = iwl_dma_addr2rbd_ptr(priv, rxb->aligned_dma_addr);
208 rxq->queue[rxq->write] = rxb;
209 rxq->write = (rxq->write + 1) & RX_QUEUE_MASK;
212 spin_unlock_irqrestore(&rxq->lock, flags);
213 /* If the pre-allocated buffer pool is dropping low, schedule to
215 if (rxq->free_count <= RX_LOW_WATERMARK)
216 queue_work(priv->workqueue, &priv->rx_replenish);
219 /* If we've added more space for the firmware to place data, tell it.
220 * Increment device's write pointer in multiples of 8. */
221 if ((write != (rxq->write & ~0x7))
222 || (abs(rxq->write - rxq->read) > 7)) {
223 spin_lock_irqsave(&rxq->lock, flags);
224 rxq->need_update = 1;
225 spin_unlock_irqrestore(&rxq->lock, flags);
226 ret = iwl_rx_queue_update_write_ptr(priv, rxq);
231 EXPORT_SYMBOL(iwl_rx_queue_restock);
235 * iwl_rx_replenish - Move all used packet from rx_used to rx_free
237 * When moving to rx_free an SKB is allocated for the slot.
239 * Also restock the Rx queue via iwl_rx_queue_restock.
240 * This is called as a scheduled work item (except for during initialization)
242 void iwl_rx_allocate(struct iwl_priv *priv)
244 struct iwl_rx_queue *rxq = &priv->rxq;
245 struct list_head *element;
246 struct iwl_rx_mem_buffer *rxb;
248 spin_lock_irqsave(&rxq->lock, flags);
249 while (!list_empty(&rxq->rx_used)) {
250 element = rxq->rx_used.next;
251 rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
253 /* Alloc a new receive buffer */
254 rxb->skb = alloc_skb(priv->hw_params.rx_buf_size + 256,
255 __GFP_NOWARN | GFP_ATOMIC);
258 printk(KERN_CRIT DRV_NAME
259 ": Can not allocate SKB buffers\n");
260 /* We don't reschedule replenish work here -- we will
261 * call the restock method and if it still needs
262 * more buffers it will schedule replenish */
265 priv->alloc_rxb_skb++;
268 /* Get physical address of RB/SKB */
269 rxb->real_dma_addr = pci_map_single(
272 priv->hw_params.rx_buf_size + 256,
274 /* dma address must be no more than 36 bits */
275 BUG_ON(rxb->real_dma_addr & ~DMA_BIT_MASK(36));
276 /* and also 256 byte aligned! */
277 rxb->aligned_dma_addr = ALIGN(rxb->real_dma_addr, 256);
278 skb_reserve(rxb->skb, rxb->aligned_dma_addr - rxb->real_dma_addr);
280 list_add_tail(&rxb->list, &rxq->rx_free);
283 spin_unlock_irqrestore(&rxq->lock, flags);
285 EXPORT_SYMBOL(iwl_rx_allocate);
287 void iwl_rx_replenish(struct iwl_priv *priv)
291 iwl_rx_allocate(priv);
293 spin_lock_irqsave(&priv->lock, flags);
294 iwl_rx_queue_restock(priv);
295 spin_unlock_irqrestore(&priv->lock, flags);
297 EXPORT_SYMBOL(iwl_rx_replenish);
300 /* Assumes that the skb field of the buffers in 'pool' is kept accurate.
301 * If an SKB has been detached, the POOL needs to have its SKB set to NULL
302 * This free routine walks the list of POOL entries and if SKB is set to
303 * non NULL it is unmapped and freed
305 void iwl_rx_queue_free(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
308 for (i = 0; i < RX_QUEUE_SIZE + RX_FREE_BUFFERS; i++) {
309 if (rxq->pool[i].skb != NULL) {
310 pci_unmap_single(priv->pci_dev,
311 rxq->pool[i].real_dma_addr,
312 priv->hw_params.rx_buf_size + 256,
314 dev_kfree_skb(rxq->pool[i].skb);
318 pci_free_consistent(priv->pci_dev, 4 * RX_QUEUE_SIZE, rxq->bd,
322 EXPORT_SYMBOL(iwl_rx_queue_free);
324 int iwl_rx_queue_alloc(struct iwl_priv *priv)
326 struct iwl_rx_queue *rxq = &priv->rxq;
327 struct pci_dev *dev = priv->pci_dev;
330 spin_lock_init(&rxq->lock);
331 INIT_LIST_HEAD(&rxq->rx_free);
332 INIT_LIST_HEAD(&rxq->rx_used);
334 /* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */
335 rxq->bd = pci_alloc_consistent(dev, 4 * RX_QUEUE_SIZE, &rxq->dma_addr);
339 /* Fill the rx_used queue with _all_ of the Rx buffers */
340 for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++)
341 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
343 /* Set us so that we have processed and used all buffers, but have
344 * not restocked the Rx queue with fresh buffers */
345 rxq->read = rxq->write = 0;
347 rxq->need_update = 0;
350 EXPORT_SYMBOL(iwl_rx_queue_alloc);
352 void iwl_rx_queue_reset(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
356 spin_lock_irqsave(&rxq->lock, flags);
357 INIT_LIST_HEAD(&rxq->rx_free);
358 INIT_LIST_HEAD(&rxq->rx_used);
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 /* In the reset function, these buffers may have been allocated
362 * to an SKB, so we need to unmap and free potential storage */
363 if (rxq->pool[i].skb != NULL) {
364 pci_unmap_single(priv->pci_dev,
365 rxq->pool[i].real_dma_addr,
366 priv->hw_params.rx_buf_size + 256,
368 priv->alloc_rxb_skb--;
369 dev_kfree_skb(rxq->pool[i].skb);
370 rxq->pool[i].skb = NULL;
372 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
375 /* Set us so that we have processed and used all buffers, but have
376 * not restocked the Rx queue with fresh buffers */
377 rxq->read = rxq->write = 0;
379 spin_unlock_irqrestore(&rxq->lock, flags);
381 EXPORT_SYMBOL(iwl_rx_queue_reset);
383 int iwl_rx_init(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
388 const u32 rfdnlog = RX_QUEUE_SIZE_LOG; /* 256 RBDs */
389 const u32 rb_timeout = 0; /* FIXME: RX_RB_TIMEOUT why this stalls RX */
391 spin_lock_irqsave(&priv->lock, flags);
392 ret = iwl_grab_nic_access(priv);
394 spin_unlock_irqrestore(&priv->lock, flags);
398 if (priv->cfg->mod_params->amsdu_size_8K)
399 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K;
401 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K;
404 iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
406 /* Reset driver's Rx queue write index */
407 iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_WPTR_REG, 0);
409 /* Tell device where to find RBD circular buffer in DRAM */
410 iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_BASE_REG,
411 (u32)(rxq->dma_addr >> 8));
413 /* Tell device where in DRAM to update its Rx status */
414 iwl_write_direct32(priv, FH_RSCSR_CHNL0_STTS_WPTR_REG,
415 (priv->shared_phys + priv->rb_closed_offset) >> 4);
418 * FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY is set becuase of HW bug in
419 * the credit mechanism in 5000 HW RX FIFO
420 * Direct rx interrupts to hosts
421 * Rx buffer size 4 or 8k
425 iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG,
426 FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL |
427 FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY |
428 FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL |
430 (rb_timeout << FH_RCSR_RX_CONFIG_REG_IRQ_RBTH_POS)|
431 (rfdnlog << FH_RCSR_RX_CONFIG_RBDCB_SIZE_POS));
433 iwl_release_nic_access(priv);
435 iwl_write32(priv, CSR_INT_COALESCING, 0x40);
437 spin_unlock_irqrestore(&priv->lock, flags);
442 int iwl_rxq_stop(struct iwl_priv *priv)
447 spin_lock_irqsave(&priv->lock, flags);
448 ret = iwl_grab_nic_access(priv);
450 spin_unlock_irqrestore(&priv->lock, flags);
455 iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
456 ret = iwl_poll_direct_bit(priv, FH_MEM_RSSR_RX_STATUS_REG,
459 IWL_ERROR("Can't stop Rx DMA.\n");
461 iwl_release_nic_access(priv);
462 spin_unlock_irqrestore(&priv->lock, flags);
466 EXPORT_SYMBOL(iwl_rxq_stop);
468 void iwl_rx_missed_beacon_notif(struct iwl_priv *priv,
469 struct iwl_rx_mem_buffer *rxb)
472 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
473 struct iwl4965_missed_beacon_notif *missed_beacon;
475 missed_beacon = &pkt->u.missed_beacon;
476 if (le32_to_cpu(missed_beacon->consequtive_missed_beacons) > 5) {
477 IWL_DEBUG_CALIB("missed bcn cnsq %d totl %d rcd %d expctd %d\n",
478 le32_to_cpu(missed_beacon->consequtive_missed_beacons),
479 le32_to_cpu(missed_beacon->total_missed_becons),
480 le32_to_cpu(missed_beacon->num_recvd_beacons),
481 le32_to_cpu(missed_beacon->num_expected_beacons));
482 if (!test_bit(STATUS_SCANNING, &priv->status))
483 iwl_init_sensitivity(priv);
486 EXPORT_SYMBOL(iwl_rx_missed_beacon_notif);
488 int iwl_rx_agg_start(struct iwl_priv *priv, const u8 *addr, int tid, u16 ssn)
493 sta_id = iwl_find_station(priv, addr);
494 if (sta_id == IWL_INVALID_STATION)
497 spin_lock_irqsave(&priv->sta_lock, flags);
498 priv->stations[sta_id].sta.station_flags_msk = 0;
499 priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_ADDBA_TID_MSK;
500 priv->stations[sta_id].sta.add_immediate_ba_tid = (u8)tid;
501 priv->stations[sta_id].sta.add_immediate_ba_ssn = cpu_to_le16(ssn);
502 priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
503 spin_unlock_irqrestore(&priv->sta_lock, flags);
505 return iwl_send_add_sta(priv, &priv->stations[sta_id].sta,
508 EXPORT_SYMBOL(iwl_rx_agg_start);
510 int iwl_rx_agg_stop(struct iwl_priv *priv, const u8 *addr, int tid)
515 sta_id = iwl_find_station(priv, addr);
516 if (sta_id == IWL_INVALID_STATION)
519 spin_lock_irqsave(&priv->sta_lock, flags);
520 priv->stations[sta_id].sta.station_flags_msk = 0;
521 priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_DELBA_TID_MSK;
522 priv->stations[sta_id].sta.remove_immediate_ba_tid = (u8)tid;
523 priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
524 spin_unlock_irqrestore(&priv->sta_lock, flags);
526 return iwl_send_add_sta(priv, &priv->stations[sta_id].sta,
529 EXPORT_SYMBOL(iwl_rx_agg_stop);
532 /* Calculate noise level, based on measurements during network silence just
533 * before arriving beacon. This measurement can be done only if we know
534 * exactly when to expect beacons, therefore only when we're associated. */
535 static void iwl_rx_calc_noise(struct iwl_priv *priv)
537 struct statistics_rx_non_phy *rx_info
538 = &(priv->statistics.rx.general);
539 int num_active_rx = 0;
540 int total_silence = 0;
542 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
544 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
546 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
549 total_silence += bcn_silence_a;
553 total_silence += bcn_silence_b;
557 total_silence += bcn_silence_c;
561 /* Average among active antennas */
563 priv->last_rx_noise = (total_silence / num_active_rx) - 107;
565 priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
567 IWL_DEBUG_CALIB("inband silence a %u, b %u, c %u, dBm %d\n",
568 bcn_silence_a, bcn_silence_b, bcn_silence_c,
569 priv->last_rx_noise);
572 #define REG_RECALIB_PERIOD (60)
574 void iwl_rx_statistics(struct iwl_priv *priv,
575 struct iwl_rx_mem_buffer *rxb)
578 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
580 IWL_DEBUG_RX("Statistics notification received (%d vs %d).\n",
581 (int)sizeof(priv->statistics), pkt->len);
583 change = ((priv->statistics.general.temperature !=
584 pkt->u.stats.general.temperature) ||
585 ((priv->statistics.flag &
586 STATISTICS_REPLY_FLG_FAT_MODE_MSK) !=
587 (pkt->u.stats.flag & STATISTICS_REPLY_FLG_FAT_MODE_MSK)));
589 memcpy(&priv->statistics, &pkt->u.stats, sizeof(priv->statistics));
591 set_bit(STATUS_STATISTICS, &priv->status);
593 /* Reschedule the statistics timer to occur in
594 * REG_RECALIB_PERIOD seconds to ensure we get a
595 * thermal update even if the uCode doesn't give
597 mod_timer(&priv->statistics_periodic, jiffies +
598 msecs_to_jiffies(REG_RECALIB_PERIOD * 1000));
600 if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
601 (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
602 iwl_rx_calc_noise(priv);
603 queue_work(priv->workqueue, &priv->run_time_calib_work);
606 iwl_leds_background(priv);
608 if (priv->cfg->ops->lib->temperature && change)
609 priv->cfg->ops->lib->temperature(priv);
611 EXPORT_SYMBOL(iwl_rx_statistics);
613 #define PERFECT_RSSI (-20) /* dBm */
614 #define WORST_RSSI (-95) /* dBm */
615 #define RSSI_RANGE (PERFECT_RSSI - WORST_RSSI)
617 /* Calculate an indication of rx signal quality (a percentage, not dBm!).
618 * See http://www.ces.clemson.edu/linux/signal_quality.shtml for info
619 * about formulas used below. */
620 static int iwl_calc_sig_qual(int rssi_dbm, int noise_dbm)
623 int degradation = PERFECT_RSSI - rssi_dbm;
625 /* If we get a noise measurement, use signal-to-noise ratio (SNR)
626 * as indicator; formula is (signal dbm - noise dbm).
627 * SNR at or above 40 is a great signal (100%).
628 * Below that, scale to fit SNR of 0 - 40 dB within 0 - 100% indicator.
629 * Weakest usable signal is usually 10 - 15 dB SNR. */
631 if (rssi_dbm - noise_dbm >= 40)
633 else if (rssi_dbm < noise_dbm)
635 sig_qual = ((rssi_dbm - noise_dbm) * 5) / 2;
637 /* Else use just the signal level.
638 * This formula is a least squares fit of data points collected and
639 * compared with a reference system that had a percentage (%) display
640 * for signal quality. */
642 sig_qual = (100 * (RSSI_RANGE * RSSI_RANGE) - degradation *
643 (15 * RSSI_RANGE + 62 * degradation)) /
644 (RSSI_RANGE * RSSI_RANGE);
648 else if (sig_qual < 1)
654 #ifdef CONFIG_IWLWIFI_DEBUG
657 * iwl_dbg_report_frame - dump frame to syslog during debug sessions
659 * You may hack this function to show different aspects of received frames,
660 * including selective frame dumps.
661 * group100 parameter selects whether to show 1 out of 100 good frames.
663 * TODO: This was originally written for 3945, need to audit for
664 * proper operation with 4965.
666 static void iwl_dbg_report_frame(struct iwl_priv *priv,
667 struct iwl_rx_packet *pkt,
668 struct ieee80211_hdr *header, int group100)
671 u32 print_summary = 0;
672 u32 print_dump = 0; /* set to 1 to dump all frames' contents */
689 struct iwl4965_rx_frame_stats *rx_stats = IWL_RX_STATS(pkt);
690 struct iwl4965_rx_frame_hdr *rx_hdr = IWL_RX_HDR(pkt);
691 struct iwl4965_rx_frame_end *rx_end = IWL_RX_END(pkt);
692 u8 *data = IWL_RX_DATA(pkt);
694 if (likely(!(priv->debug_level & IWL_DL_RX)))
698 fc = header->frame_control;
699 seq_ctl = le16_to_cpu(header->seq_ctrl);
702 channel = le16_to_cpu(rx_hdr->channel);
703 phy_flags = le16_to_cpu(rx_hdr->phy_flags);
704 rate_sym = rx_hdr->rate;
705 length = le16_to_cpu(rx_hdr->len);
707 /* end-of-frame status and timestamp */
708 status = le32_to_cpu(rx_end->status);
709 bcn_tmr = le32_to_cpu(rx_end->beacon_timestamp);
710 tsf_low = le64_to_cpu(rx_end->timestamp) & 0x0ffffffff;
711 tsf = le64_to_cpu(rx_end->timestamp);
713 /* signal statistics */
714 rssi = rx_stats->rssi;
716 sig_avg = le16_to_cpu(rx_stats->sig_avg);
717 noise_diff = le16_to_cpu(rx_stats->noise_diff);
719 to_us = !compare_ether_addr(header->addr1, priv->mac_addr);
721 /* if data frame is to us and all is good,
722 * (optionally) print summary for only 1 out of every 100 */
723 if (to_us && (fc & ~cpu_to_le16(IEEE80211_FCTL_PROTECTED)) ==
724 cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FTYPE_DATA)) {
727 print_summary = 1; /* print each frame */
728 else if (priv->framecnt_to_us < 100) {
729 priv->framecnt_to_us++;
732 priv->framecnt_to_us = 0;
737 /* print summary for all other frames */
748 else if (ieee80211_has_retry(fc))
750 else if (ieee80211_is_assoc_resp(fc))
752 else if (ieee80211_is_reassoc_resp(fc))
754 else if (ieee80211_is_probe_resp(fc)) {
756 print_dump = 1; /* dump frame contents */
757 } else if (ieee80211_is_beacon(fc)) {
759 print_dump = 1; /* dump frame contents */
760 } else if (ieee80211_is_atim(fc))
762 else if (ieee80211_is_auth(fc))
764 else if (ieee80211_is_deauth(fc))
766 else if (ieee80211_is_disassoc(fc))
771 rate_idx = iwl_hwrate_to_plcp_idx(rate_sym);
772 if (unlikely(rate_idx == -1))
775 bitrate = iwl_rates[rate_idx].ieee / 2;
777 /* print frame summary.
778 * MAC addresses show just the last byte (for brevity),
779 * but you can hack it to show more, if you'd like to. */
781 IWL_DEBUG_RX("%s: mhd=0x%04x, dst=0x%02x, "
782 "len=%u, rssi=%d, chnl=%d, rate=%u, \n",
783 title, le16_to_cpu(fc), header->addr1[5],
784 length, rssi, channel, bitrate);
786 /* src/dst addresses assume managed mode */
787 IWL_DEBUG_RX("%s: 0x%04x, dst=0x%02x, "
788 "src=0x%02x, rssi=%u, tim=%lu usec, "
789 "phy=0x%02x, chnl=%d\n",
790 title, le16_to_cpu(fc), header->addr1[5],
791 header->addr3[5], rssi,
792 tsf_low - priv->scan_start_tsf,
797 iwl_print_hex_dump(priv, IWL_DL_RX, data, length);
800 static inline void iwl_dbg_report_frame(struct iwl_priv *priv,
801 struct iwl_rx_packet *pkt,
802 struct ieee80211_hdr *header,
808 static void iwl_update_rx_stats(struct iwl_priv *priv, u16 fc, u16 len)
810 /* 0 - mgmt, 1 - cnt, 2 - data */
811 int idx = (fc & IEEE80211_FCTL_FTYPE) >> 2;
812 priv->rx_stats[idx].cnt++;
813 priv->rx_stats[idx].bytes += len;
817 * returns non-zero if packet should be dropped
819 static int iwl_set_decrypted_flag(struct iwl_priv *priv,
820 struct ieee80211_hdr *hdr,
822 struct ieee80211_rx_status *stats)
824 u16 fc = le16_to_cpu(hdr->frame_control);
826 if (priv->active_rxon.filter_flags & RXON_FILTER_DIS_DECRYPT_MSK)
829 if (!(fc & IEEE80211_FCTL_PROTECTED))
832 IWL_DEBUG_RX("decrypt_res:0x%x\n", decrypt_res);
833 switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
834 case RX_RES_STATUS_SEC_TYPE_TKIP:
835 /* The uCode has got a bad phase 1 Key, pushes the packet.
836 * Decryption will be done in SW. */
837 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
838 RX_RES_STATUS_BAD_KEY_TTAK)
841 case RX_RES_STATUS_SEC_TYPE_WEP:
842 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
843 RX_RES_STATUS_BAD_ICV_MIC) {
844 /* bad ICV, the packet is destroyed since the
845 * decryption is inplace, drop it */
846 IWL_DEBUG_RX("Packet destroyed\n");
849 case RX_RES_STATUS_SEC_TYPE_CCMP:
850 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
851 RX_RES_STATUS_DECRYPT_OK) {
852 IWL_DEBUG_RX("hw decrypt successfully!!!\n");
853 stats->flag |= RX_FLAG_DECRYPTED;
863 static u32 iwl_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
867 if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
868 RX_RES_STATUS_STATION_FOUND)
869 decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
870 RX_RES_STATUS_NO_STATION_INFO_MISMATCH);
872 decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
874 /* packet was not encrypted */
875 if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
876 RX_RES_STATUS_SEC_TYPE_NONE)
879 /* packet was encrypted with unknown alg */
880 if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
881 RX_RES_STATUS_SEC_TYPE_ERR)
884 /* decryption was not done in HW */
885 if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
886 RX_MPDU_RES_STATUS_DEC_DONE_MSK)
889 switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
891 case RX_RES_STATUS_SEC_TYPE_CCMP:
892 /* alg is CCM: check MIC only */
893 if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
895 decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
897 decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
901 case RX_RES_STATUS_SEC_TYPE_TKIP:
902 if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
904 decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
907 /* fall through if TTAK OK */
909 if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
910 decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
912 decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
916 IWL_DEBUG_RX("decrypt_in:0x%x decrypt_out = 0x%x\n",
917 decrypt_in, decrypt_out);
922 static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
924 struct iwl_rx_mem_buffer *rxb,
925 struct ieee80211_rx_status *stats)
927 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
928 struct iwl_rx_phy_res *rx_start = (include_phy) ?
929 (struct iwl_rx_phy_res *)&(pkt->u.raw[0]) : NULL;
930 struct ieee80211_hdr *hdr;
935 u32 ampdu_status_legacy;
937 if (!include_phy && priv->last_phy_res[0])
938 rx_start = (struct iwl_rx_phy_res *)&priv->last_phy_res[1];
941 IWL_ERROR("MPDU frame without a PHY data\n");
945 hdr = (struct ieee80211_hdr *)((u8 *) &rx_start[1] +
946 rx_start->cfg_phy_cnt);
948 len = le16_to_cpu(rx_start->byte_count);
950 rx_end = (__le32 *)((u8 *) &pkt->u.raw[0] +
951 sizeof(struct iwl_rx_phy_res) +
952 rx_start->cfg_phy_cnt + len);
955 struct iwl4965_rx_mpdu_res_start *amsdu =
956 (struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;
958 hdr = (struct ieee80211_hdr *)(pkt->u.raw +
959 sizeof(struct iwl4965_rx_mpdu_res_start));
960 len = le16_to_cpu(amsdu->byte_count);
961 rx_start->byte_count = amsdu->byte_count;
962 rx_end = (__le32 *) (((u8 *) hdr) + len);
965 ampdu_status = le32_to_cpu(*rx_end);
966 skblen = ((u8 *) rx_end - (u8 *) &pkt->u.raw[0]) + sizeof(u32);
969 /* New status scheme, need to translate */
970 ampdu_status_legacy = ampdu_status;
971 ampdu_status = iwl_translate_rx_status(priv, ampdu_status);
975 skb_reserve(rxb->skb, (void *)hdr - (void *)pkt);
976 skb_put(rxb->skb, len); /* end where data ends */
978 /* We only process data packets if the interface is open */
979 if (unlikely(!priv->is_open)) {
981 ("Dropping packet while interface is not open.\n");
985 hdr = (struct ieee80211_hdr *)rxb->skb->data;
987 /* in case of HW accelerated crypto and bad decryption, drop */
988 if (!priv->hw_params.sw_crypto &&
989 iwl_set_decrypted_flag(priv, hdr, ampdu_status, stats))
992 iwl_update_rx_stats(priv, le16_to_cpu(hdr->frame_control), len);
993 ieee80211_rx_irqsafe(priv->hw, rxb->skb, stats);
994 priv->alloc_rxb_skb--;
998 /* Calc max signal level (dBm) among 3 possible receivers */
999 static inline int iwl_calc_rssi(struct iwl_priv *priv,
1000 struct iwl_rx_phy_res *rx_resp)
1002 return priv->cfg->ops->utils->calc_rssi(priv, rx_resp);
1006 static void iwl_sta_modify_ps_wake(struct iwl_priv *priv, int sta_id)
1008 unsigned long flags;
1010 spin_lock_irqsave(&priv->sta_lock, flags);
1011 priv->stations[sta_id].sta.station_flags &= ~STA_FLG_PWR_SAVE_MSK;
1012 priv->stations[sta_id].sta.station_flags_msk = STA_FLG_PWR_SAVE_MSK;
1013 priv->stations[sta_id].sta.sta.modify_mask = 0;
1014 priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1015 spin_unlock_irqrestore(&priv->sta_lock, flags);
1017 iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
1020 static void iwl_update_ps_mode(struct iwl_priv *priv, u16 ps_bit, u8 *addr)
1022 /* FIXME: need locking over ps_status ??? */
1023 u8 sta_id = iwl_find_station(priv, addr);
1025 if (sta_id != IWL_INVALID_STATION) {
1026 u8 sta_awake = priv->stations[sta_id].
1027 ps_status == STA_PS_STATUS_WAKE;
1029 if (sta_awake && ps_bit)
1030 priv->stations[sta_id].ps_status = STA_PS_STATUS_SLEEP;
1031 else if (!sta_awake && !ps_bit) {
1032 iwl_sta_modify_ps_wake(priv, sta_id);
1033 priv->stations[sta_id].ps_status = STA_PS_STATUS_WAKE;
1038 /* This is necessary only for a number of statistics, see the caller. */
1039 static int iwl_is_network_packet(struct iwl_priv *priv,
1040 struct ieee80211_hdr *header)
1042 /* Filter incoming packets to determine if they are targeted toward
1043 * this network, discarding packets coming from ourselves */
1044 switch (priv->iw_mode) {
1045 case NL80211_IFTYPE_ADHOC: /* Header: Dest. | Source | BSSID */
1046 /* packets to our IBSS update information */
1047 return !compare_ether_addr(header->addr3, priv->bssid);
1048 case NL80211_IFTYPE_STATION: /* Header: Dest. | AP{BSSID} | Source */
1049 /* packets to our IBSS update information */
1050 return !compare_ether_addr(header->addr2, priv->bssid);
1056 /* Called for REPLY_RX (legacy ABG frames), or
1057 * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
1058 void iwl_rx_reply_rx(struct iwl_priv *priv,
1059 struct iwl_rx_mem_buffer *rxb)
1061 struct ieee80211_hdr *header;
1062 struct ieee80211_rx_status rx_status;
1063 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
1064 /* Use phy data (Rx signal strength, etc.) contained within
1065 * this rx packet for legacy frames,
1066 * or phy data cached from REPLY_RX_PHY_CMD for HT frames. */
1067 int include_phy = (pkt->hdr.cmd == REPLY_RX);
1068 struct iwl_rx_phy_res *rx_start = (include_phy) ?
1069 (struct iwl_rx_phy_res *)&(pkt->u.raw[0]) :
1070 (struct iwl_rx_phy_res *)&priv->last_phy_res[1];
1072 unsigned int len = 0;
1076 rx_status.mactime = le64_to_cpu(rx_start->timestamp);
1078 ieee80211_channel_to_frequency(le16_to_cpu(rx_start->channel));
1079 rx_status.band = (rx_start->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
1080 IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
1081 rx_status.rate_idx =
1082 iwl_hwrate_to_plcp_idx(le32_to_cpu(rx_start->rate_n_flags));
1083 if (rx_status.band == IEEE80211_BAND_5GHZ)
1084 rx_status.rate_idx -= IWL_FIRST_OFDM_RATE;
1088 /* TSF isn't reliable. In order to allow smooth user experience,
1089 * this W/A doesn't propagate it to the mac80211 */
1090 /*rx_status.flag |= RX_FLAG_TSFT;*/
1092 if ((unlikely(rx_start->cfg_phy_cnt > 20))) {
1093 IWL_DEBUG_DROP("dsp size out of range [0,20]: %d/n",
1094 rx_start->cfg_phy_cnt);
1099 if (priv->last_phy_res[0])
1100 rx_start = (struct iwl_rx_phy_res *)
1101 &priv->last_phy_res[1];
1107 IWL_ERROR("MPDU frame without a PHY data\n");
1112 header = (struct ieee80211_hdr *)((u8 *) &rx_start[1]
1113 + rx_start->cfg_phy_cnt);
1115 len = le16_to_cpu(rx_start->byte_count);
1116 rx_end = (__le32 *)(pkt->u.raw + rx_start->cfg_phy_cnt +
1117 sizeof(struct iwl_rx_phy_res) + len);
1119 struct iwl4965_rx_mpdu_res_start *amsdu =
1120 (struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;
1122 header = (void *)(pkt->u.raw +
1123 sizeof(struct iwl4965_rx_mpdu_res_start));
1124 len = le16_to_cpu(amsdu->byte_count);
1125 rx_end = (__le32 *) (pkt->u.raw +
1126 sizeof(struct iwl4965_rx_mpdu_res_start) + len);
1129 if (!(*rx_end & RX_RES_STATUS_NO_CRC32_ERROR) ||
1130 !(*rx_end & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
1131 IWL_DEBUG_RX("Bad CRC or FIFO: 0x%08X.\n",
1132 le32_to_cpu(*rx_end));
1136 priv->ucode_beacon_time = le32_to_cpu(rx_start->beacon_time_stamp);
1138 /* Find max signal strength (dBm) among 3 antenna/receiver chains */
1139 rx_status.signal = iwl_calc_rssi(priv, rx_start);
1141 /* Meaningful noise values are available only from beacon statistics,
1142 * which are gathered only when associated, and indicate noise
1143 * only for the associated network channel ...
1144 * Ignore these noise values while scanning (other channels) */
1145 if (iwl_is_associated(priv) &&
1146 !test_bit(STATUS_SCANNING, &priv->status)) {
1147 rx_status.noise = priv->last_rx_noise;
1148 rx_status.qual = iwl_calc_sig_qual(rx_status.signal,
1151 rx_status.noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
1152 rx_status.qual = iwl_calc_sig_qual(rx_status.signal, 0);
1155 /* Reset beacon noise level if not associated. */
1156 if (!iwl_is_associated(priv))
1157 priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
1159 /* Set "1" to report good data frames in groups of 100 */
1160 /* FIXME: need to optimze the call: */
1161 iwl_dbg_report_frame(priv, pkt, header, 1);
1163 IWL_DEBUG_STATS_LIMIT("Rssi %d, noise %d, qual %d, TSF %llu\n",
1164 rx_status.signal, rx_status.noise, rx_status.signal,
1165 (unsigned long long)rx_status.mactime);
1170 * It seems that the antenna field in the phy flags value
1171 * is actually a bitfield. This is undefined by radiotap,
1172 * it wants an actual antenna number but I always get "7"
1173 * for most legacy frames I receive indicating that the
1174 * same frame was received on all three RX chains.
1176 * I think this field should be removed in favour of a
1177 * new 802.11n radiotap field "RX chains" that is defined
1180 rx_status.antenna = le16_to_cpu(rx_start->phy_flags &
1181 RX_RES_PHY_FLAGS_ANTENNA_MSK) >> 4;
1183 /* set the preamble flag if appropriate */
1184 if (rx_start->phy_flags & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK)
1185 rx_status.flag |= RX_FLAG_SHORTPRE;
1187 /* Take shortcut when only in monitor mode */
1188 if (priv->iw_mode == NL80211_IFTYPE_MONITOR) {
1189 iwl_pass_packet_to_mac80211(priv, include_phy,
1194 network_packet = iwl_is_network_packet(priv, header);
1195 if (network_packet) {
1196 priv->last_rx_rssi = rx_status.signal;
1197 priv->last_beacon_time = priv->ucode_beacon_time;
1198 priv->last_tsf = le64_to_cpu(rx_start->timestamp);
1201 fc = le16_to_cpu(header->frame_control);
1202 switch (fc & IEEE80211_FCTL_FTYPE) {
1203 case IEEE80211_FTYPE_MGMT:
1204 case IEEE80211_FTYPE_DATA:
1205 if (priv->iw_mode == NL80211_IFTYPE_AP)
1206 iwl_update_ps_mode(priv, fc & IEEE80211_FCTL_PM,
1210 iwl_pass_packet_to_mac80211(priv, include_phy, rxb,
1216 EXPORT_SYMBOL(iwl_rx_reply_rx);
1218 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
1219 * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
1220 void iwl_rx_reply_rx_phy(struct iwl_priv *priv,
1221 struct iwl_rx_mem_buffer *rxb)
1223 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
1224 priv->last_phy_res[0] = 1;
1225 memcpy(&priv->last_phy_res[1], &(pkt->u.raw[0]),
1226 sizeof(struct iwl_rx_phy_res));
1228 EXPORT_SYMBOL(iwl_rx_reply_rx_phy);