2 * This file is part of wl1271
4 * Copyright (C) 2009 Nokia Corporation
6 * Contact: Luciano Coelho <luciano.coelho@nokia.com>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * version 2 as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26 #include <linux/etherdevice.h>
27 #include <linux/spinlock.h>
38 * TODO: this is here just for now, it must be removed when the data
39 * operations are in place.
41 #include "../wl12xx/reg.h"
43 static int wl1271_set_default_wep_key(struct wl1271 *wl,
44 struct wl12xx_vif *wlvif, u8 id)
47 bool is_ap = (wlvif->bss_type == BSS_TYPE_AP_BSS);
50 ret = wl12xx_cmd_set_default_wep_key(wl, id,
51 wlvif->ap.bcast_hlid);
53 ret = wl12xx_cmd_set_default_wep_key(wl, id, wlvif->sta.hlid);
58 wl1271_debug(DEBUG_CRYPT, "default wep key idx: %d", (int)id);
62 static int wl1271_alloc_tx_id(struct wl1271 *wl, struct sk_buff *skb)
66 id = find_first_zero_bit(wl->tx_frames_map, wl->num_tx_desc);
67 if (id >= wl->num_tx_desc)
70 __set_bit(id, wl->tx_frames_map);
71 wl->tx_frames[id] = skb;
76 void wl1271_free_tx_id(struct wl1271 *wl, int id)
78 if (__test_and_clear_bit(id, wl->tx_frames_map)) {
79 if (unlikely(wl->tx_frames_cnt == wl->num_tx_desc))
80 clear_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
82 wl->tx_frames[id] = NULL;
86 EXPORT_SYMBOL(wl1271_free_tx_id);
88 static void wl1271_tx_ap_update_inconnection_sta(struct wl1271 *wl,
91 struct ieee80211_hdr *hdr;
94 * add the station to the known list before transmitting the
95 * authentication response. this way it won't get de-authed by FW
96 * when transmitting too soon.
98 hdr = (struct ieee80211_hdr *)(skb->data +
99 sizeof(struct wl1271_tx_hw_descr));
100 if (ieee80211_is_auth(hdr->frame_control))
101 wl1271_acx_set_inconnection_sta(wl, hdr->addr1);
104 static void wl1271_tx_regulate_link(struct wl1271 *wl,
105 struct wl12xx_vif *wlvif,
111 if (WARN_ON(!test_bit(hlid, wlvif->links_map)))
114 fw_ps = test_bit(hlid, (unsigned long *)&wl->ap_fw_ps_map);
115 tx_pkts = wl->links[hlid].allocated_pkts;
118 * if in FW PS and there is enough data in FW we can put the link
119 * into high-level PS and clean out its TX queues.
120 * Make an exception if this is the only connected link. In this
121 * case FW-memory congestion is less of a problem.
122 * Note that a single connected STA means 3 active links, since we must
123 * account for the global and broadcast AP links. The "fw_ps" check
124 * assures us the third link is a STA connected to the AP. Otherwise
125 * the FW would not set the PSM bit.
127 if (wl->active_link_count > 3 && fw_ps &&
128 tx_pkts >= WL1271_PS_STA_MAX_PACKETS)
129 wl12xx_ps_link_start(wl, wlvif, hlid, true);
132 bool wl12xx_is_dummy_packet(struct wl1271 *wl, struct sk_buff *skb)
134 return wl->dummy_packet == skb;
136 EXPORT_SYMBOL(wl12xx_is_dummy_packet);
138 static u8 wl12xx_tx_get_hlid_ap(struct wl1271 *wl, struct wl12xx_vif *wlvif,
139 struct sk_buff *skb, struct ieee80211_sta *sta)
142 struct wl1271_station *wl_sta;
144 wl_sta = (struct wl1271_station *)sta->drv_priv;
147 struct ieee80211_hdr *hdr;
149 if (!test_bit(WLVIF_FLAG_AP_STARTED, &wlvif->flags))
150 return wl->system_hlid;
152 hdr = (struct ieee80211_hdr *)skb->data;
153 if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
154 return wlvif->ap.bcast_hlid;
156 return wlvif->ap.global_hlid;
160 u8 wl12xx_tx_get_hlid(struct wl1271 *wl, struct wl12xx_vif *wlvif,
161 struct sk_buff *skb, struct ieee80211_sta *sta)
163 struct ieee80211_tx_info *control;
165 if (wlvif->bss_type == BSS_TYPE_AP_BSS)
166 return wl12xx_tx_get_hlid_ap(wl, wlvif, skb, sta);
168 control = IEEE80211_SKB_CB(skb);
169 if (control->flags & IEEE80211_TX_CTL_TX_OFFCHAN) {
170 wl1271_debug(DEBUG_TX, "tx offchannel");
171 return wlvif->dev_hlid;
174 return wlvif->sta.hlid;
177 unsigned int wlcore_calc_packet_alignment(struct wl1271 *wl,
178 unsigned int packet_length)
180 if ((wl->quirks & WLCORE_QUIRK_TX_PAD_LAST_FRAME) ||
181 !(wl->quirks & WLCORE_QUIRK_TX_BLOCKSIZE_ALIGN))
182 return ALIGN(packet_length, WL1271_TX_ALIGN_TO);
184 return ALIGN(packet_length, WL12XX_BUS_BLOCK_SIZE);
186 EXPORT_SYMBOL(wlcore_calc_packet_alignment);
188 static int wl1271_tx_allocate(struct wl1271 *wl, struct wl12xx_vif *wlvif,
189 struct sk_buff *skb, u32 extra, u32 buf_offset,
190 u8 hlid, bool is_gem)
192 struct wl1271_tx_hw_descr *desc;
193 u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
195 int id, ret = -EBUSY, ac;
198 if (buf_offset + total_len > wl->aggr_buf_size)
201 spare_blocks = wlcore_hw_get_spare_blocks(wl, is_gem);
203 /* allocate free identifier for the packet */
204 id = wl1271_alloc_tx_id(wl, skb);
208 total_blocks = wlcore_hw_calc_tx_blocks(wl, total_len, spare_blocks);
210 if (total_blocks <= wl->tx_blocks_available) {
211 desc = (struct wl1271_tx_hw_descr *)skb_push(
212 skb, total_len - skb->len);
214 wlcore_hw_set_tx_desc_blocks(wl, desc, total_blocks,
219 wl->tx_blocks_available -= total_blocks;
220 wl->tx_allocated_blocks += total_blocks;
222 /* If the FW was empty before, arm the Tx watchdog */
223 if (wl->tx_allocated_blocks == total_blocks)
224 wl12xx_rearm_tx_watchdog_locked(wl);
226 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
227 wl->tx_allocated_pkts[ac]++;
229 if (test_bit(hlid, wl->links_map))
230 wl->links[hlid].allocated_pkts++;
234 wl1271_debug(DEBUG_TX,
235 "tx_allocate: size: %d, blocks: %d, id: %d",
236 total_len, total_blocks, id);
238 wl1271_free_tx_id(wl, id);
244 static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct wl12xx_vif *wlvif,
245 struct sk_buff *skb, u32 extra,
246 struct ieee80211_tx_info *control, u8 hlid)
249 struct wl1271_tx_hw_descr *desc;
253 __le16 frame_control;
254 struct ieee80211_hdr *hdr;
258 desc = (struct wl1271_tx_hw_descr *) skb->data;
259 frame_start = (u8 *)(desc + 1);
260 hdr = (struct ieee80211_hdr *)(frame_start + extra);
261 frame_control = hdr->frame_control;
263 /* relocate space for security header */
265 int hdrlen = ieee80211_hdrlen(frame_control);
266 memmove(frame_start, hdr, hdrlen);
267 skb_set_network_header(skb, skb_network_offset(skb) + extra);
270 /* configure packet life time */
272 hosttime = (timespec_to_ns(&ts) >> 10);
273 desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
275 is_dummy = wl12xx_is_dummy_packet(wl, skb);
276 if (is_dummy || !wlvif || wlvif->bss_type != BSS_TYPE_AP_BSS)
277 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
279 desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU);
282 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
283 desc->tid = skb->priority;
287 * FW expects the dummy packet to have an invalid session id -
288 * any session id that is different than the one set in the join
290 tx_attr = (SESSION_COUNTER_INVALID <<
291 TX_HW_ATTR_OFST_SESSION_COUNTER) &
292 TX_HW_ATTR_SESSION_COUNTER;
294 tx_attr |= TX_HW_ATTR_TX_DUMMY_REQ;
296 u8 session_id = wl->session_ids[hlid];
298 if ((wl->quirks & WLCORE_QUIRK_AP_ZERO_SESSION_ID) &&
299 (wlvif->bss_type == BSS_TYPE_AP_BSS))
302 /* configure the tx attributes */
303 tx_attr = session_id << TX_HW_ATTR_OFST_SESSION_COUNTER;
307 if (is_dummy || !wlvif)
309 else if (wlvif->bss_type != BSS_TYPE_AP_BSS) {
311 * if the packets are data packets
312 * send them with AP rate policies (EAPOLs are an exception),
313 * otherwise use default basic rates
315 if (skb->protocol == cpu_to_be16(ETH_P_PAE))
316 rate_idx = wlvif->sta.basic_rate_idx;
317 else if (control->flags & IEEE80211_TX_CTL_NO_CCK_RATE)
318 rate_idx = wlvif->sta.p2p_rate_idx;
319 else if (ieee80211_is_data(frame_control))
320 rate_idx = wlvif->sta.ap_rate_idx;
322 rate_idx = wlvif->sta.basic_rate_idx;
324 if (hlid == wlvif->ap.global_hlid)
325 rate_idx = wlvif->ap.mgmt_rate_idx;
326 else if (hlid == wlvif->ap.bcast_hlid ||
327 skb->protocol == cpu_to_be16(ETH_P_PAE) ||
328 !ieee80211_is_data(frame_control))
330 * send non-data, bcast and EAPOLs using the
333 rate_idx = wlvif->ap.bcast_rate_idx;
335 rate_idx = wlvif->ap.ucast_rate_idx[ac];
338 tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY;
340 /* for WEP shared auth - no fw encryption is needed */
341 if (ieee80211_is_auth(frame_control) &&
342 ieee80211_has_protected(frame_control))
343 tx_attr |= TX_HW_ATTR_HOST_ENCRYPT;
345 desc->tx_attr = cpu_to_le16(tx_attr);
347 wlcore_hw_set_tx_desc_csum(wl, desc, skb);
348 wlcore_hw_set_tx_desc_data_len(wl, desc, skb);
351 /* caller must hold wl->mutex */
352 static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct wl12xx_vif *wlvif,
353 struct sk_buff *skb, u32 buf_offset, u8 hlid)
355 struct ieee80211_tx_info *info;
363 wl1271_error("discarding null skb");
367 if (hlid == WL12XX_INVALID_LINK_ID) {
368 wl1271_error("invalid hlid. dropping skb 0x%p", skb);
372 info = IEEE80211_SKB_CB(skb);
374 is_dummy = wl12xx_is_dummy_packet(wl, skb);
376 if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
377 info->control.hw_key &&
378 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
379 extra = WL1271_EXTRA_SPACE_TKIP;
381 if (info->control.hw_key) {
383 u8 idx = info->control.hw_key->hw_key_idx;
384 u32 cipher = info->control.hw_key->cipher;
386 is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
387 (cipher == WLAN_CIPHER_SUITE_WEP104);
389 if (WARN_ON(is_wep && wlvif->default_key != idx)) {
390 ret = wl1271_set_default_wep_key(wl, wlvif, idx);
393 wlvif->default_key = idx;
396 is_gem = (cipher == WL1271_CIPHER_SUITE_GEM);
399 ret = wl1271_tx_allocate(wl, wlvif, skb, extra, buf_offset, hlid,
404 wl1271_tx_fill_hdr(wl, wlvif, skb, extra, info, hlid);
406 if (!is_dummy && wlvif && wlvif->bss_type == BSS_TYPE_AP_BSS) {
407 wl1271_tx_ap_update_inconnection_sta(wl, skb);
408 wl1271_tx_regulate_link(wl, wlvif, hlid);
412 * The length of each packet is stored in terms of
413 * words. Thus, we must pad the skb data to make sure its
414 * length is aligned. The number of padding bytes is computed
415 * and set in wl1271_tx_fill_hdr.
416 * In special cases, we want to align to a specific block size
417 * (eg. for wl128x with SDIO we align to 256).
419 total_len = wlcore_calc_packet_alignment(wl, skb->len);
421 memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
422 memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
424 /* Revert side effects in the dummy packet skb, so it can be reused */
426 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
431 u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set,
432 enum ieee80211_band rate_band)
434 struct ieee80211_supported_band *band;
435 u32 enabled_rates = 0;
438 band = wl->hw->wiphy->bands[rate_band];
439 for (bit = 0; bit < band->n_bitrates; bit++) {
441 enabled_rates |= band->bitrates[bit].hw_value;
445 /* MCS rates indication are on bits 16 - 31 */
446 rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
448 for (bit = 0; bit < 16; bit++) {
450 enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
454 return enabled_rates;
457 void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
460 struct wl12xx_vif *wlvif;
462 wl12xx_for_each_wlvif(wl, wlvif) {
463 for (i = 0; i < NUM_TX_QUEUES; i++) {
464 if (wlcore_is_queue_stopped_by_reason(wl, wlvif, i,
465 WLCORE_QUEUE_STOP_REASON_WATERMARK) &&
466 wlvif->tx_queue_count[i] <=
467 WL1271_TX_QUEUE_LOW_WATERMARK)
468 /* firmware buffer has space, restart queues */
469 wlcore_wake_queue(wl, wlvif, i,
470 WLCORE_QUEUE_STOP_REASON_WATERMARK);
475 static int wlcore_select_ac(struct wl1271 *wl)
478 u32 min_pkts = 0xffffffff;
481 * Find a non-empty ac where:
482 * 1. There are packets to transmit
483 * 2. The FW has the least allocated blocks
485 * We prioritize the ACs according to VO>VI>BE>BK
487 for (i = 0; i < NUM_TX_QUEUES; i++) {
488 ac = wl1271_tx_get_queue(i);
489 if (wl->tx_queue_count[ac] &&
490 wl->tx_allocated_pkts[ac] < min_pkts) {
492 min_pkts = wl->tx_allocated_pkts[q];
499 static struct sk_buff *wlcore_lnk_dequeue(struct wl1271 *wl,
500 struct wl1271_link *lnk, u8 q)
505 skb = skb_dequeue(&lnk->tx_queue[q]);
507 spin_lock_irqsave(&wl->wl_lock, flags);
508 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
509 wl->tx_queue_count[q]--;
511 WARN_ON_ONCE(lnk->wlvif->tx_queue_count[q] <= 0);
512 lnk->wlvif->tx_queue_count[q]--;
514 spin_unlock_irqrestore(&wl->wl_lock, flags);
520 static struct sk_buff *wlcore_lnk_dequeue_high_prio(struct wl1271 *wl,
524 struct wl1271_link *lnk = &wl->links[hlid];
526 if (!wlcore_hw_lnk_high_prio(wl, hlid, lnk)) {
527 if (*low_prio_hlid == WL12XX_INVALID_LINK_ID &&
528 !skb_queue_empty(&lnk->tx_queue[ac]) &&
529 wlcore_hw_lnk_low_prio(wl, hlid, lnk))
530 /* we found the first non-empty low priority queue */
531 *low_prio_hlid = hlid;
536 return wlcore_lnk_dequeue(wl, lnk, ac);
539 static struct sk_buff *wlcore_vif_dequeue_high_prio(struct wl1271 *wl,
540 struct wl12xx_vif *wlvif,
544 struct sk_buff *skb = NULL;
545 int i, h, start_hlid;
547 /* start from the link after the last one */
548 start_hlid = (wlvif->last_tx_hlid + 1) % WL12XX_MAX_LINKS;
550 /* dequeue according to AC, round robin on each link */
551 for (i = 0; i < WL12XX_MAX_LINKS; i++) {
552 h = (start_hlid + i) % WL12XX_MAX_LINKS;
554 /* only consider connected stations */
555 if (!test_bit(h, wlvif->links_map))
558 skb = wlcore_lnk_dequeue_high_prio(wl, h, ac,
563 wlvif->last_tx_hlid = h;
568 wlvif->last_tx_hlid = 0;
570 *hlid = wlvif->last_tx_hlid;
574 static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl, u8 *hlid)
577 struct wl12xx_vif *wlvif = wl->last_wlvif;
578 struct sk_buff *skb = NULL;
580 u8 low_prio_hlid = WL12XX_INVALID_LINK_ID;
582 ac = wlcore_select_ac(wl);
586 /* continue from last wlvif (round robin) */
588 wl12xx_for_each_wlvif_continue(wl, wlvif) {
589 if (!wlvif->tx_queue_count[ac])
592 skb = wlcore_vif_dequeue_high_prio(wl, wlvif, ac, hlid,
597 wl->last_wlvif = wlvif;
602 /* dequeue from the system HLID before the restarting wlvif list */
604 skb = wlcore_lnk_dequeue_high_prio(wl, wl->system_hlid,
607 *hlid = wl->system_hlid;
608 wl->last_wlvif = NULL;
612 /* Do a new pass over the wlvif list. But no need to continue
613 * after last_wlvif. The previous pass should have found it. */
615 wl12xx_for_each_wlvif(wl, wlvif) {
616 if (!wlvif->tx_queue_count[ac])
619 skb = wlcore_vif_dequeue_high_prio(wl, wlvif, ac, hlid,
622 wl->last_wlvif = wlvif;
627 if (wlvif == wl->last_wlvif)
632 /* no high priority skbs found - but maybe a low priority one? */
633 if (!skb && low_prio_hlid != WL12XX_INVALID_LINK_ID) {
634 struct wl1271_link *lnk = &wl->links[low_prio_hlid];
635 skb = wlcore_lnk_dequeue(wl, lnk, ac);
637 WARN_ON(!skb); /* we checked this before */
638 *hlid = low_prio_hlid;
640 /* ensure proper round robin in the vif/link levels */
641 wl->last_wlvif = lnk->wlvif;
643 lnk->wlvif->last_tx_hlid = low_prio_hlid;
649 test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) {
652 skb = wl->dummy_packet;
653 *hlid = wl->system_hlid;
654 q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
655 spin_lock_irqsave(&wl->wl_lock, flags);
656 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
657 wl->tx_queue_count[q]--;
658 spin_unlock_irqrestore(&wl->wl_lock, flags);
664 static void wl1271_skb_queue_head(struct wl1271 *wl, struct wl12xx_vif *wlvif,
665 struct sk_buff *skb, u8 hlid)
668 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
670 if (wl12xx_is_dummy_packet(wl, skb)) {
671 set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags);
673 skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
675 /* make sure we dequeue the same packet next time */
676 wlvif->last_tx_hlid = (hlid + WL12XX_MAX_LINKS - 1) %
680 spin_lock_irqsave(&wl->wl_lock, flags);
681 wl->tx_queue_count[q]++;
683 wlvif->tx_queue_count[q]++;
684 spin_unlock_irqrestore(&wl->wl_lock, flags);
687 static bool wl1271_tx_is_data_present(struct sk_buff *skb)
689 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data);
691 return ieee80211_is_data_present(hdr->frame_control);
694 void wl12xx_rearm_rx_streaming(struct wl1271 *wl, unsigned long *active_hlids)
696 struct wl12xx_vif *wlvif;
700 if (!wl->conf.rx_streaming.interval)
703 if (!wl->conf.rx_streaming.always &&
704 !test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))
707 timeout = wl->conf.rx_streaming.duration;
708 wl12xx_for_each_wlvif_sta(wl, wlvif) {
710 for_each_set_bit(hlid, active_hlids, WL12XX_MAX_LINKS) {
711 if (test_bit(hlid, wlvif->links_map)) {
720 /* enable rx streaming */
721 if (!test_bit(WLVIF_FLAG_RX_STREAMING_STARTED, &wlvif->flags))
722 ieee80211_queue_work(wl->hw,
723 &wlvif->rx_streaming_enable_work);
725 mod_timer(&wlvif->rx_streaming_timer,
726 jiffies + msecs_to_jiffies(timeout));
731 * Returns failure values only in case of failed bus ops within this function.
732 * wl1271_prepare_tx_frame retvals won't be returned in order to avoid
733 * triggering recovery by higher layers when not necessary.
734 * In case a FW command fails within wl1271_prepare_tx_frame fails a recovery
735 * will be queued in wl1271_cmd_send. -EAGAIN/-EBUSY from prepare_tx_frame
736 * can occur and are legitimate so don't propagate. -EINVAL will emit a WARNING
737 * within prepare_tx_frame code but there's nothing we should do about those
740 int wlcore_tx_work_locked(struct wl1271 *wl)
742 struct wl12xx_vif *wlvif;
744 struct wl1271_tx_hw_descr *desc;
745 u32 buf_offset = 0, last_len = 0;
746 bool sent_packets = false;
747 unsigned long active_hlids[BITS_TO_LONGS(WL12XX_MAX_LINKS)] = {0};
752 if (unlikely(wl->state != WLCORE_STATE_ON))
755 while ((skb = wl1271_skb_dequeue(wl, &hlid))) {
756 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
757 bool has_data = false;
760 if (!wl12xx_is_dummy_packet(wl, skb))
761 wlvif = wl12xx_vif_to_data(info->control.vif);
763 hlid = wl->system_hlid;
765 has_data = wlvif && wl1271_tx_is_data_present(skb);
766 ret = wl1271_prepare_tx_frame(wl, wlvif, skb, buf_offset,
768 if (ret == -EAGAIN) {
770 * Aggregation buffer is full.
771 * Flush buffer and try again.
773 wl1271_skb_queue_head(wl, wlvif, skb, hlid);
775 buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset,
777 bus_ret = wlcore_write_data(wl, REG_SLV_MEM_DATA,
778 wl->aggr_buf, buf_offset, true);
785 } else if (ret == -EBUSY) {
787 * Firmware buffer is full.
788 * Queue back last skb, and stop aggregating.
790 wl1271_skb_queue_head(wl, wlvif, skb, hlid);
791 /* No work left, avoid scheduling redundant tx work */
792 set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
794 } else if (ret < 0) {
795 if (wl12xx_is_dummy_packet(wl, skb))
797 * fw still expects dummy packet,
800 wl1271_skb_queue_head(wl, wlvif, skb, hlid);
802 ieee80211_free_txskb(wl->hw, skb);
806 buf_offset += last_len;
807 wl->tx_packets_count++;
809 desc = (struct wl1271_tx_hw_descr *) skb->data;
810 __set_bit(desc->hlid, active_hlids);
816 buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset, last_len);
817 bus_ret = wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
826 * Interrupt the firmware with the new packets. This is only
827 * required for older hardware revisions
829 if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) {
830 bus_ret = wlcore_write32(wl, WL12XX_HOST_WR_ACCESS,
831 wl->tx_packets_count);
836 wl1271_handle_tx_low_watermark(wl);
838 wl12xx_rearm_rx_streaming(wl, active_hlids);
844 void wl1271_tx_work(struct work_struct *work)
846 struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
849 mutex_lock(&wl->mutex);
850 ret = wl1271_ps_elp_wakeup(wl);
854 ret = wlcore_tx_work_locked(wl);
856 wl12xx_queue_recovery_work(wl);
860 wl1271_ps_elp_sleep(wl);
862 mutex_unlock(&wl->mutex);
865 static u8 wl1271_tx_get_rate_flags(u8 rate_class_index)
870 * TODO: use wl12xx constants when this code is moved to wl12xx, as
871 * only it uses Tx-completion.
873 if (rate_class_index <= 8)
874 flags |= IEEE80211_TX_RC_MCS;
877 * TODO: use wl12xx constants when this code is moved to wl12xx, as
878 * only it uses Tx-completion.
880 if (rate_class_index == 0)
881 flags |= IEEE80211_TX_RC_SHORT_GI;
886 static void wl1271_tx_complete_packet(struct wl1271 *wl,
887 struct wl1271_tx_hw_res_descr *result)
889 struct ieee80211_tx_info *info;
890 struct ieee80211_vif *vif;
891 struct wl12xx_vif *wlvif;
898 /* check for id legality */
899 if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) {
900 wl1271_warning("TX result illegal id: %d", id);
904 skb = wl->tx_frames[id];
905 info = IEEE80211_SKB_CB(skb);
907 if (wl12xx_is_dummy_packet(wl, skb)) {
908 wl1271_free_tx_id(wl, id);
912 /* info->control is valid as long as we don't update info->status */
913 vif = info->control.vif;
914 wlvif = wl12xx_vif_to_data(vif);
916 /* update the TX status info */
917 if (result->status == TX_SUCCESS) {
918 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
919 info->flags |= IEEE80211_TX_STAT_ACK;
920 rate = wlcore_rate_to_idx(wl, result->rate_class_index,
922 rate_flags = wl1271_tx_get_rate_flags(result->rate_class_index);
923 retries = result->ack_failures;
924 } else if (result->status == TX_RETRY_EXCEEDED) {
925 wl->stats.excessive_retries++;
926 retries = result->ack_failures;
929 info->status.rates[0].idx = rate;
930 info->status.rates[0].count = retries;
931 info->status.rates[0].flags = rate_flags;
932 info->status.ack_signal = -1;
934 wl->stats.retry_count += result->ack_failures;
936 /* remove private header from packet */
937 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
939 /* remove TKIP header space if present */
940 if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
941 info->control.hw_key &&
942 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
943 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
944 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data,
946 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
949 wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
951 result->id, skb, result->ack_failures,
952 result->rate_class_index, result->status);
954 /* return the packet to the stack */
955 skb_queue_tail(&wl->deferred_tx_queue, skb);
956 queue_work(wl->freezable_wq, &wl->netstack_work);
957 wl1271_free_tx_id(wl, result->id);
960 /* Called upon reception of a TX complete interrupt */
961 int wlcore_tx_complete(struct wl1271 *wl)
963 struct wl1271_acx_mem_map *memmap = wl->target_mem_map;
964 u32 count, fw_counter;
968 /* read the tx results from the chipset */
969 ret = wlcore_read(wl, le32_to_cpu(memmap->tx_result),
970 wl->tx_res_if, sizeof(*wl->tx_res_if), false);
974 fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
976 /* write host counter to chipset (to ack) */
977 ret = wlcore_write32(wl, le32_to_cpu(memmap->tx_result) +
978 offsetof(struct wl1271_tx_hw_res_if,
979 tx_result_host_counter), fw_counter);
983 count = fw_counter - wl->tx_results_count;
984 wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
986 /* verify that the result buffer is not getting overrun */
987 if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
988 wl1271_warning("TX result overflow from chipset: %d", count);
990 /* process the results */
991 for (i = 0; i < count; i++) {
992 struct wl1271_tx_hw_res_descr *result;
993 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
995 /* process the packet */
996 result = &(wl->tx_res_if->tx_results_queue[offset]);
997 wl1271_tx_complete_packet(wl, result);
999 wl->tx_results_count++;
1005 EXPORT_SYMBOL(wlcore_tx_complete);
1007 void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
1009 struct sk_buff *skb;
1011 unsigned long flags;
1012 struct ieee80211_tx_info *info;
1013 int total[NUM_TX_QUEUES];
1014 struct wl1271_link *lnk = &wl->links[hlid];
1016 for (i = 0; i < NUM_TX_QUEUES; i++) {
1018 while ((skb = skb_dequeue(&lnk->tx_queue[i]))) {
1019 wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
1021 if (!wl12xx_is_dummy_packet(wl, skb)) {
1022 info = IEEE80211_SKB_CB(skb);
1023 info->status.rates[0].idx = -1;
1024 info->status.rates[0].count = 0;
1025 ieee80211_tx_status_ni(wl->hw, skb);
1032 spin_lock_irqsave(&wl->wl_lock, flags);
1033 for (i = 0; i < NUM_TX_QUEUES; i++) {
1034 wl->tx_queue_count[i] -= total[i];
1036 lnk->wlvif->tx_queue_count[i] -= total[i];
1038 spin_unlock_irqrestore(&wl->wl_lock, flags);
1040 wl1271_handle_tx_low_watermark(wl);
1043 /* caller must hold wl->mutex and TX must be stopped */
1044 void wl12xx_tx_reset_wlvif(struct wl1271 *wl, struct wl12xx_vif *wlvif)
1049 for_each_set_bit(i, wlvif->links_map, WL12XX_MAX_LINKS) {
1050 if (wlvif->bss_type == BSS_TYPE_AP_BSS &&
1051 i != wlvif->ap.bcast_hlid && i != wlvif->ap.global_hlid) {
1052 /* this calls wl12xx_free_link */
1053 wl1271_free_sta(wl, wlvif, i);
1056 wl12xx_free_link(wl, wlvif, &hlid);
1059 wlvif->last_tx_hlid = 0;
1061 for (i = 0; i < NUM_TX_QUEUES; i++)
1062 wlvif->tx_queue_count[i] = 0;
1064 /* caller must hold wl->mutex and TX must be stopped */
1065 void wl12xx_tx_reset(struct wl1271 *wl)
1068 struct sk_buff *skb;
1069 struct ieee80211_tx_info *info;
1071 /* only reset the queues if something bad happened */
1072 if (wl1271_tx_total_queue_count(wl) != 0) {
1073 for (i = 0; i < WL12XX_MAX_LINKS; i++)
1074 wl1271_tx_reset_link_queues(wl, i);
1076 for (i = 0; i < NUM_TX_QUEUES; i++)
1077 wl->tx_queue_count[i] = 0;
1081 * Make sure the driver is at a consistent state, in case this
1082 * function is called from a context other than interface removal.
1083 * This call will always wake the TX queues.
1085 wl1271_handle_tx_low_watermark(wl);
1087 for (i = 0; i < wl->num_tx_desc; i++) {
1088 if (wl->tx_frames[i] == NULL)
1091 skb = wl->tx_frames[i];
1092 wl1271_free_tx_id(wl, i);
1093 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
1095 if (!wl12xx_is_dummy_packet(wl, skb)) {
1097 * Remove private headers before passing the skb to
1100 info = IEEE80211_SKB_CB(skb);
1101 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
1102 if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
1103 info->control.hw_key &&
1104 info->control.hw_key->cipher ==
1105 WLAN_CIPHER_SUITE_TKIP) {
1106 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1107 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP,
1109 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
1112 info->status.rates[0].idx = -1;
1113 info->status.rates[0].count = 0;
1115 ieee80211_tx_status_ni(wl->hw, skb);
1120 #define WL1271_TX_FLUSH_TIMEOUT 500000
1122 /* caller must *NOT* hold wl->mutex */
1123 void wl1271_tx_flush(struct wl1271 *wl)
1125 unsigned long timeout, start_time;
1127 start_time = jiffies;
1128 timeout = start_time + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
1130 /* only one flush should be in progress, for consistent queue state */
1131 mutex_lock(&wl->flush_mutex);
1133 mutex_lock(&wl->mutex);
1134 if (wl->tx_frames_cnt == 0 && wl1271_tx_total_queue_count(wl) == 0) {
1135 mutex_unlock(&wl->mutex);
1139 wlcore_stop_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH);
1141 while (!time_after(jiffies, timeout)) {
1142 wl1271_debug(DEBUG_MAC80211, "flushing tx buffer: %d %d",
1144 wl1271_tx_total_queue_count(wl));
1146 /* force Tx and give the driver some time to flush data */
1147 mutex_unlock(&wl->mutex);
1148 if (wl1271_tx_total_queue_count(wl))
1149 wl1271_tx_work(&wl->tx_work);
1151 mutex_lock(&wl->mutex);
1153 if ((wl->tx_frames_cnt == 0) &&
1154 (wl1271_tx_total_queue_count(wl) == 0)) {
1155 wl1271_debug(DEBUG_MAC80211, "tx flush took %d ms",
1156 jiffies_to_msecs(jiffies - start_time));
1161 wl1271_warning("Unable to flush all TX buffers, "
1162 "timed out (timeout %d ms",
1163 WL1271_TX_FLUSH_TIMEOUT / 1000);
1165 /* forcibly flush all Tx buffers on our queues */
1166 for (i = 0; i < WL12XX_MAX_LINKS; i++)
1167 wl1271_tx_reset_link_queues(wl, i);
1170 wlcore_wake_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH);
1171 mutex_unlock(&wl->mutex);
1173 mutex_unlock(&wl->flush_mutex);
1175 EXPORT_SYMBOL_GPL(wl1271_tx_flush);
1177 u32 wl1271_tx_min_rate_get(struct wl1271 *wl, u32 rate_set)
1179 if (WARN_ON(!rate_set))
1182 return BIT(__ffs(rate_set));
1184 EXPORT_SYMBOL_GPL(wl1271_tx_min_rate_get);
1186 void wlcore_stop_queue_locked(struct wl1271 *wl, struct wl12xx_vif *wlvif,
1187 u8 queue, enum wlcore_queue_stop_reason reason)
1189 int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1190 bool stopped = !!wl->queue_stop_reasons[hwq];
1192 /* queue should not be stopped for this reason */
1193 WARN_ON_ONCE(test_and_set_bit(reason, &wl->queue_stop_reasons[hwq]));
1198 ieee80211_stop_queue(wl->hw, hwq);
1201 void wlcore_stop_queue(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 queue,
1202 enum wlcore_queue_stop_reason reason)
1204 unsigned long flags;
1206 spin_lock_irqsave(&wl->wl_lock, flags);
1207 wlcore_stop_queue_locked(wl, wlvif, queue, reason);
1208 spin_unlock_irqrestore(&wl->wl_lock, flags);
1211 void wlcore_wake_queue(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 queue,
1212 enum wlcore_queue_stop_reason reason)
1214 unsigned long flags;
1215 int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1217 spin_lock_irqsave(&wl->wl_lock, flags);
1219 /* queue should not be clear for this reason */
1220 WARN_ON_ONCE(!test_and_clear_bit(reason, &wl->queue_stop_reasons[hwq]));
1222 if (wl->queue_stop_reasons[hwq])
1225 ieee80211_wake_queue(wl->hw, hwq);
1228 spin_unlock_irqrestore(&wl->wl_lock, flags);
1231 void wlcore_stop_queues(struct wl1271 *wl,
1232 enum wlcore_queue_stop_reason reason)
1235 unsigned long flags;
1237 spin_lock_irqsave(&wl->wl_lock, flags);
1239 /* mark all possible queues as stopped */
1240 for (i = 0; i < WLCORE_NUM_MAC_ADDRESSES * NUM_TX_QUEUES; i++)
1241 WARN_ON_ONCE(test_and_set_bit(reason,
1242 &wl->queue_stop_reasons[i]));
1244 /* use the global version to make sure all vifs in mac80211 we don't
1247 ieee80211_stop_queues(wl->hw);
1249 spin_unlock_irqrestore(&wl->wl_lock, flags);
1252 void wlcore_wake_queues(struct wl1271 *wl,
1253 enum wlcore_queue_stop_reason reason)
1256 unsigned long flags;
1258 spin_lock_irqsave(&wl->wl_lock, flags);
1260 /* mark all possible queues as awake */
1261 for (i = 0; i < WLCORE_NUM_MAC_ADDRESSES * NUM_TX_QUEUES; i++)
1262 WARN_ON_ONCE(!test_and_clear_bit(reason,
1263 &wl->queue_stop_reasons[i]));
1265 /* use the global version to make sure all vifs in mac80211 we don't
1266 * know are woken up.
1268 ieee80211_wake_queues(wl->hw);
1270 spin_unlock_irqrestore(&wl->wl_lock, flags);
1273 bool wlcore_is_queue_stopped_by_reason(struct wl1271 *wl,
1274 struct wl12xx_vif *wlvif, u8 queue,
1275 enum wlcore_queue_stop_reason reason)
1277 unsigned long flags;
1280 spin_lock_irqsave(&wl->wl_lock, flags);
1281 stopped = wlcore_is_queue_stopped_by_reason_locked(wl, wlvif, queue,
1283 spin_unlock_irqrestore(&wl->wl_lock, flags);
1288 bool wlcore_is_queue_stopped_by_reason_locked(struct wl1271 *wl,
1289 struct wl12xx_vif *wlvif, u8 queue,
1290 enum wlcore_queue_stop_reason reason)
1292 int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1294 assert_spin_locked(&wl->wl_lock);
1295 return test_bit(reason, &wl->queue_stop_reasons[hwq]);
1298 bool wlcore_is_queue_stopped_locked(struct wl1271 *wl, struct wl12xx_vif *wlvif,
1301 int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1303 assert_spin_locked(&wl->wl_lock);
1304 return !!wl->queue_stop_reasons[hwq];