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>
34 static int wl1271_set_default_wep_key(struct wl1271 *wl, u8 id)
37 bool is_ap = (wl->bss_type == BSS_TYPE_AP_BSS);
40 ret = wl1271_cmd_set_ap_default_wep_key(wl, id);
42 ret = wl1271_cmd_set_sta_default_wep_key(wl, id);
47 wl1271_debug(DEBUG_CRYPT, "default wep key idx: %d", (int)id);
51 static int wl1271_alloc_tx_id(struct wl1271 *wl, struct sk_buff *skb)
55 id = find_first_zero_bit(wl->tx_frames_map, ACX_TX_DESCRIPTORS);
56 if (id >= ACX_TX_DESCRIPTORS)
59 __set_bit(id, wl->tx_frames_map);
60 wl->tx_frames[id] = skb;
65 static void wl1271_free_tx_id(struct wl1271 *wl, int id)
67 if (__test_and_clear_bit(id, wl->tx_frames_map)) {
68 wl->tx_frames[id] = NULL;
73 static void wl1271_tx_ap_update_inconnection_sta(struct wl1271 *wl,
76 struct ieee80211_hdr *hdr;
79 * add the station to the known list before transmitting the
80 * authentication response. this way it won't get de-authed by FW
81 * when transmitting too soon.
83 hdr = (struct ieee80211_hdr *)(skb->data +
84 sizeof(struct wl1271_tx_hw_descr));
85 if (ieee80211_is_auth(hdr->frame_control))
86 wl1271_acx_set_inconnection_sta(wl, hdr->addr1);
89 static void wl1271_tx_regulate_link(struct wl1271 *wl, u8 hlid)
94 /* only regulate station links */
95 if (hlid < WL1271_AP_STA_HLID_START)
98 fw_ps = test_bit(hlid, (unsigned long *)&wl->ap_fw_ps_map);
99 tx_blks = wl->links[hlid].allocated_blks;
102 * if in FW PS and there is enough data in FW we can put the link
103 * into high-level PS and clean out its TX queues.
105 if (fw_ps && tx_blks >= WL1271_PS_STA_MAX_BLOCKS)
106 wl1271_ps_link_start(wl, hlid, true);
109 u8 wl1271_tx_get_hlid(struct sk_buff *skb)
111 struct ieee80211_tx_info *control = IEEE80211_SKB_CB(skb);
113 if (control->control.sta) {
114 struct wl1271_station *wl_sta;
116 wl_sta = (struct wl1271_station *)
117 control->control.sta->drv_priv;
120 struct ieee80211_hdr *hdr;
122 hdr = (struct ieee80211_hdr *)skb->data;
123 if (ieee80211_is_mgmt(hdr->frame_control))
124 return WL1271_AP_GLOBAL_HLID;
126 return WL1271_AP_BROADCAST_HLID;
130 static int wl1271_tx_allocate(struct wl1271 *wl, struct sk_buff *skb, u32 extra,
131 u32 buf_offset, u8 hlid)
133 struct wl1271_tx_hw_descr *desc;
134 u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
137 int id, ret = -EBUSY;
139 if (buf_offset + total_len > WL1271_AGGR_BUFFER_SIZE)
142 /* allocate free identifier for the packet */
143 id = wl1271_alloc_tx_id(wl, skb);
147 /* approximate the number of blocks required for this packet
150 len = ALIGN(total_len, wl->block_size);
154 total_blocks = (len + TX_HW_BLOCK_SIZE - 1) / TX_HW_BLOCK_SIZE +
157 if (total_blocks <= wl->tx_blocks_available) {
158 desc = (struct wl1271_tx_hw_descr *)skb_push(
159 skb, total_len - skb->len);
161 /* HW descriptor fields change between wl127x and wl128x */
162 if (wl->chip.id == CHIP_ID_1283_PG20) {
163 desc->wl128x_mem.total_mem_blocks = total_blocks;
165 desc->wl127x_mem.extra_blocks = TX_HW_BLOCK_SPARE;
166 desc->wl127x_mem.total_mem_blocks = total_blocks;
171 wl->tx_blocks_available -= total_blocks;
173 if (wl->bss_type == BSS_TYPE_AP_BSS)
174 wl->links[hlid].allocated_blks += total_blocks;
178 wl1271_debug(DEBUG_TX,
179 "tx_allocate: size: %d, blocks: %d, id: %d",
180 total_len, total_blocks, id);
182 wl1271_free_tx_id(wl, id);
188 static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct sk_buff *skb,
189 u32 extra, struct ieee80211_tx_info *control,
193 struct wl1271_tx_hw_descr *desc;
194 int aligned_len, ac, rate_idx;
198 desc = (struct wl1271_tx_hw_descr *) skb->data;
200 /* relocate space for security header */
202 void *framestart = skb->data + sizeof(*desc);
203 u16 fc = *(u16 *)(framestart + extra);
204 int hdrlen = ieee80211_hdrlen(cpu_to_le16(fc));
205 memmove(framestart, framestart + extra, hdrlen);
208 /* configure packet life time */
210 hosttime = (timespec_to_ns(&ts) >> 10);
211 desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
213 if (wl->bss_type != BSS_TYPE_AP_BSS)
214 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
216 desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU);
218 /* configure the tx attributes */
219 tx_attr = wl->session_counter << TX_HW_ATTR_OFST_SESSION_COUNTER;
221 /* queue (we use same identifiers for tid's and ac's */
222 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
225 if (wl->bss_type != BSS_TYPE_AP_BSS) {
228 /* if the packets are destined for AP (have a STA entry)
229 send them with AP rate policies, otherwise use default
231 if (control->control.sta)
232 rate_idx = ACX_TX_AP_FULL_RATE;
234 rate_idx = ACX_TX_BASIC_RATE;
238 case WL1271_AP_GLOBAL_HLID:
239 rate_idx = ACX_TX_AP_MODE_MGMT_RATE;
241 case WL1271_AP_BROADCAST_HLID:
242 rate_idx = ACX_TX_AP_MODE_BCST_RATE;
250 tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY;
253 if (wl->block_size) {
254 aligned_len = ALIGN(skb->len, wl->block_size);
256 desc->wl128x_mem.extra_bytes = aligned_len - skb->len;
257 desc->length = cpu_to_le16(aligned_len >> 2);
259 wl1271_debug(DEBUG_TX, "tx_fill_hdr: hlid: %d "
260 "tx_attr: 0x%x len: %d life: %d mem: %d",
262 le16_to_cpu(desc->length),
263 le16_to_cpu(desc->life_time),
264 desc->wl128x_mem.total_mem_blocks);
268 /* align the length (and store in terms of words) */
269 aligned_len = ALIGN(skb->len, WL1271_TX_ALIGN_TO);
270 desc->length = cpu_to_le16(aligned_len >> 2);
272 /* calculate number of padding bytes */
273 pad = aligned_len - skb->len;
274 tx_attr |= pad << TX_HW_ATTR_OFST_LAST_WORD_PAD;
276 wl1271_debug(DEBUG_TX, "tx_fill_hdr: pad: %d hlid: %d "
277 "tx_attr: 0x%x len: %d life: %d mem: %d", pad,
279 le16_to_cpu(desc->length),
280 le16_to_cpu(desc->life_time),
281 desc->wl127x_mem.total_mem_blocks);
284 desc->tx_attr = cpu_to_le16(tx_attr);
287 /* caller must hold wl->mutex */
288 static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct sk_buff *skb,
291 struct ieee80211_tx_info *info;
300 info = IEEE80211_SKB_CB(skb);
302 if (info->control.hw_key &&
303 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
304 extra = WL1271_TKIP_IV_SPACE;
306 if (info->control.hw_key) {
308 u8 idx = info->control.hw_key->hw_key_idx;
309 u32 cipher = info->control.hw_key->cipher;
311 is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
312 (cipher == WLAN_CIPHER_SUITE_WEP104);
314 if (unlikely(is_wep && wl->default_key != idx)) {
315 ret = wl1271_set_default_wep_key(wl, idx);
318 wl->default_key = idx;
322 if (wl->bss_type == BSS_TYPE_AP_BSS)
323 hlid = wl1271_tx_get_hlid(skb);
325 hlid = TX_HW_DEFAULT_AID;
327 ret = wl1271_tx_allocate(wl, skb, extra, buf_offset, hlid);
331 if (wl->bss_type == BSS_TYPE_AP_BSS) {
332 wl1271_tx_ap_update_inconnection_sta(wl, skb);
333 wl1271_tx_regulate_link(wl, hlid);
336 wl1271_tx_fill_hdr(wl, skb, extra, info, hlid);
339 * The length of each packet is stored in terms of
340 * words. Thus, we must pad the skb data to make sure its
341 * length is aligned. The number of padding bytes is computed
342 * and set in wl1271_tx_fill_hdr.
343 * In special cases, we want to align to a specific block size
344 * (eg. for wl128x with SDIO we align to 256).
347 total_len = ALIGN(skb->len, wl->block_size);
349 total_len = ALIGN(skb->len, WL1271_TX_ALIGN_TO);
351 memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
352 memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
357 u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set)
359 struct ieee80211_supported_band *band;
360 u32 enabled_rates = 0;
363 band = wl->hw->wiphy->bands[wl->band];
364 for (bit = 0; bit < band->n_bitrates; bit++) {
366 enabled_rates |= band->bitrates[bit].hw_value;
370 #ifdef CONFIG_WL12XX_HT
371 /* MCS rates indication are on bits 16 - 23 */
372 rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
374 for (bit = 0; bit < 8; bit++) {
376 enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
381 return enabled_rates;
384 void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
388 if (test_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags) &&
389 wl->tx_queue_count <= WL1271_TX_QUEUE_LOW_WATERMARK) {
390 /* firmware buffer has space, restart queues */
391 spin_lock_irqsave(&wl->wl_lock, flags);
392 ieee80211_wake_queues(wl->hw);
393 clear_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags);
394 spin_unlock_irqrestore(&wl->wl_lock, flags);
398 static struct sk_buff *wl1271_sta_skb_dequeue(struct wl1271 *wl)
400 struct sk_buff *skb = NULL;
403 skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_VO]);
406 skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_VI]);
409 skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_BE]);
412 skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_BK]);
416 spin_lock_irqsave(&wl->wl_lock, flags);
417 wl->tx_queue_count--;
418 spin_unlock_irqrestore(&wl->wl_lock, flags);
424 static struct sk_buff *wl1271_ap_skb_dequeue(struct wl1271 *wl)
426 struct sk_buff *skb = NULL;
428 int i, h, start_hlid;
430 /* start from the link after the last one */
431 start_hlid = (wl->last_tx_hlid + 1) % AP_MAX_LINKS;
433 /* dequeue according to AC, round robin on each link */
434 for (i = 0; i < AP_MAX_LINKS; i++) {
435 h = (start_hlid + i) % AP_MAX_LINKS;
437 skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_VO]);
440 skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_VI]);
443 skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_BE]);
446 skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_BK]);
453 wl->last_tx_hlid = h;
454 spin_lock_irqsave(&wl->wl_lock, flags);
455 wl->tx_queue_count--;
456 spin_unlock_irqrestore(&wl->wl_lock, flags);
458 wl->last_tx_hlid = 0;
464 static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl)
466 if (wl->bss_type == BSS_TYPE_AP_BSS)
467 return wl1271_ap_skb_dequeue(wl);
469 return wl1271_sta_skb_dequeue(wl);
472 static void wl1271_skb_queue_head(struct wl1271 *wl, struct sk_buff *skb)
475 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
477 if (wl->bss_type == BSS_TYPE_AP_BSS) {
478 u8 hlid = wl1271_tx_get_hlid(skb);
479 skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
481 /* make sure we dequeue the same packet next time */
482 wl->last_tx_hlid = (hlid + AP_MAX_LINKS - 1) % AP_MAX_LINKS;
484 skb_queue_head(&wl->tx_queue[q], skb);
487 spin_lock_irqsave(&wl->wl_lock, flags);
488 wl->tx_queue_count++;
489 spin_unlock_irqrestore(&wl->wl_lock, flags);
492 void wl1271_tx_work_locked(struct wl1271 *wl)
495 bool woken_up = false;
497 bool sent_packets = false;
500 if (unlikely(wl->state == WL1271_STATE_OFF))
503 while ((skb = wl1271_skb_dequeue(wl))) {
505 ret = wl1271_ps_elp_wakeup(wl);
511 ret = wl1271_prepare_tx_frame(wl, skb, buf_offset);
512 if (ret == -EAGAIN) {
514 * Aggregation buffer is full.
515 * Flush buffer and try again.
517 wl1271_skb_queue_head(wl, skb);
518 wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
523 } else if (ret == -EBUSY) {
525 * Firmware buffer is full.
526 * Queue back last skb, and stop aggregating.
528 wl1271_skb_queue_head(wl, skb);
529 /* No work left, avoid scheduling redundant tx work */
530 set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
532 } else if (ret < 0) {
537 wl->tx_packets_count++;
542 wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
548 * Interrupt the firmware with the new packets. This is only
549 * required for older hardware revisions
551 if (wl->quirks & WL12XX_QUIRK_END_OF_TRANSACTION)
552 wl1271_write32(wl, WL1271_HOST_WR_ACCESS,
553 wl->tx_packets_count);
555 wl1271_handle_tx_low_watermark(wl);
560 wl1271_ps_elp_sleep(wl);
563 void wl1271_tx_work(struct work_struct *work)
565 struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
567 mutex_lock(&wl->mutex);
568 wl1271_tx_work_locked(wl);
569 mutex_unlock(&wl->mutex);
572 static void wl1271_tx_complete_packet(struct wl1271 *wl,
573 struct wl1271_tx_hw_res_descr *result)
575 struct ieee80211_tx_info *info;
581 /* check for id legality */
582 if (unlikely(id >= ACX_TX_DESCRIPTORS || wl->tx_frames[id] == NULL)) {
583 wl1271_warning("TX result illegal id: %d", id);
587 skb = wl->tx_frames[id];
588 info = IEEE80211_SKB_CB(skb);
590 /* update the TX status info */
591 if (result->status == TX_SUCCESS) {
592 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
593 info->flags |= IEEE80211_TX_STAT_ACK;
594 rate = wl1271_rate_to_idx(result->rate_class_index, wl->band);
595 retries = result->ack_failures;
596 } else if (result->status == TX_RETRY_EXCEEDED) {
597 wl->stats.excessive_retries++;
598 retries = result->ack_failures;
601 info->status.rates[0].idx = rate;
602 info->status.rates[0].count = retries;
603 info->status.rates[0].flags = 0;
604 info->status.ack_signal = -1;
606 wl->stats.retry_count += result->ack_failures;
608 /* update security sequence number */
609 wl->tx_security_seq += (result->lsb_security_sequence_number -
610 wl->tx_security_last_seq);
611 wl->tx_security_last_seq = result->lsb_security_sequence_number;
613 /* remove private header from packet */
614 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
616 /* remove TKIP header space if present */
617 if (info->control.hw_key &&
618 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
619 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
620 memmove(skb->data + WL1271_TKIP_IV_SPACE, skb->data, hdrlen);
621 skb_pull(skb, WL1271_TKIP_IV_SPACE);
624 wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
626 result->id, skb, result->ack_failures,
627 result->rate_class_index, result->status);
629 /* return the packet to the stack */
630 skb_queue_tail(&wl->deferred_tx_queue, skb);
631 ieee80211_queue_work(wl->hw, &wl->netstack_work);
632 wl1271_free_tx_id(wl, result->id);
635 /* Called upon reception of a TX complete interrupt */
636 void wl1271_tx_complete(struct wl1271 *wl)
638 struct wl1271_acx_mem_map *memmap =
639 (struct wl1271_acx_mem_map *)wl->target_mem_map;
640 u32 count, fw_counter;
643 /* read the tx results from the chipset */
644 wl1271_read(wl, le32_to_cpu(memmap->tx_result),
645 wl->tx_res_if, sizeof(*wl->tx_res_if), false);
646 fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
648 /* write host counter to chipset (to ack) */
649 wl1271_write32(wl, le32_to_cpu(memmap->tx_result) +
650 offsetof(struct wl1271_tx_hw_res_if,
651 tx_result_host_counter), fw_counter);
653 count = fw_counter - wl->tx_results_count;
654 wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
656 /* verify that the result buffer is not getting overrun */
657 if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
658 wl1271_warning("TX result overflow from chipset: %d", count);
660 /* process the results */
661 for (i = 0; i < count; i++) {
662 struct wl1271_tx_hw_res_descr *result;
663 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
665 /* process the packet */
666 result = &(wl->tx_res_if->tx_results_queue[offset]);
667 wl1271_tx_complete_packet(wl, result);
669 wl->tx_results_count++;
673 void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
678 struct ieee80211_tx_info *info;
680 for (i = 0; i < NUM_TX_QUEUES; i++) {
681 while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
682 wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
683 info = IEEE80211_SKB_CB(skb);
684 info->status.rates[0].idx = -1;
685 info->status.rates[0].count = 0;
686 ieee80211_tx_status(wl->hw, skb);
691 spin_lock_irqsave(&wl->wl_lock, flags);
692 wl->tx_queue_count -= total;
693 spin_unlock_irqrestore(&wl->wl_lock, flags);
695 wl1271_handle_tx_low_watermark(wl);
698 /* caller must hold wl->mutex */
699 void wl1271_tx_reset(struct wl1271 *wl)
703 struct ieee80211_tx_info *info;
706 if (wl->bss_type == BSS_TYPE_AP_BSS) {
707 for (i = 0; i < AP_MAX_LINKS; i++) {
708 wl1271_tx_reset_link_queues(wl, i);
709 wl->links[i].allocated_blks = 0;
710 wl->links[i].prev_freed_blks = 0;
713 wl->last_tx_hlid = 0;
715 for (i = 0; i < NUM_TX_QUEUES; i++) {
716 while ((skb = skb_dequeue(&wl->tx_queue[i]))) {
717 wl1271_debug(DEBUG_TX, "freeing skb 0x%p",
719 info = IEEE80211_SKB_CB(skb);
720 info->status.rates[0].idx = -1;
721 info->status.rates[0].count = 0;
722 ieee80211_tx_status(wl->hw, skb);
727 wl->tx_queue_count = 0;
730 * Make sure the driver is at a consistent state, in case this
731 * function is called from a context other than interface removal.
733 wl1271_handle_tx_low_watermark(wl);
735 for (i = 0; i < ACX_TX_DESCRIPTORS; i++) {
736 if (wl->tx_frames[i] == NULL)
739 skb = wl->tx_frames[i];
740 wl1271_free_tx_id(wl, i);
741 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
743 /* Remove private headers before passing the skb to mac80211 */
744 info = IEEE80211_SKB_CB(skb);
745 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
746 if (info->control.hw_key &&
747 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
748 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
749 memmove(skb->data + WL1271_TKIP_IV_SPACE, skb->data,
751 skb_pull(skb, WL1271_TKIP_IV_SPACE);
754 info->status.rates[0].idx = -1;
755 info->status.rates[0].count = 0;
757 ieee80211_tx_status(wl->hw, skb);
761 #define WL1271_TX_FLUSH_TIMEOUT 500000
763 /* caller must *NOT* hold wl->mutex */
764 void wl1271_tx_flush(struct wl1271 *wl)
766 unsigned long timeout;
767 timeout = jiffies + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
769 while (!time_after(jiffies, timeout)) {
770 mutex_lock(&wl->mutex);
771 wl1271_debug(DEBUG_TX, "flushing tx buffer: %d %d",
772 wl->tx_frames_cnt, wl->tx_queue_count);
773 if ((wl->tx_frames_cnt == 0) && (wl->tx_queue_count == 0)) {
774 mutex_unlock(&wl->mutex);
777 mutex_unlock(&wl->mutex);
781 wl1271_warning("Unable to flush all TX buffers, timed out.");
784 u32 wl1271_tx_min_rate_get(struct wl1271 *wl)
789 if (!wl->basic_rate_set) {
791 wl->basic_rate_set = wl->conf.tx.basic_rate;
794 for (i = 0; !rate; i++) {
795 if ((wl->basic_rate_set >> i) & 0x1)