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>
33 static int wl1271_alloc_tx_id(struct wl1271 *wl, struct sk_buff *skb)
37 id = find_first_zero_bit(wl->tx_frames_map, ACX_TX_DESCRIPTORS);
38 if (id >= ACX_TX_DESCRIPTORS)
41 __set_bit(id, wl->tx_frames_map);
42 wl->tx_frames[id] = skb;
47 static void wl1271_free_tx_id(struct wl1271 *wl, int id)
49 if (__test_and_clear_bit(id, wl->tx_frames_map)) {
50 wl->tx_frames[id] = NULL;
55 static int wl1271_tx_allocate(struct wl1271 *wl, struct sk_buff *skb, u32 extra,
58 struct wl1271_tx_hw_descr *desc;
59 u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
63 if (buf_offset + total_len > WL1271_AGGR_BUFFER_SIZE)
66 /* allocate free identifier for the packet */
67 id = wl1271_alloc_tx_id(wl, skb);
71 /* approximate the number of blocks required for this packet
73 total_blocks = total_len + TX_HW_BLOCK_SIZE - 1;
74 total_blocks = total_blocks / TX_HW_BLOCK_SIZE + TX_HW_BLOCK_SPARE;
75 if (total_blocks <= wl->tx_blocks_available) {
76 desc = (struct wl1271_tx_hw_descr *)skb_push(
77 skb, total_len - skb->len);
79 desc->extra_mem_blocks = TX_HW_BLOCK_SPARE;
80 desc->total_mem_blocks = total_blocks;
83 wl->tx_blocks_available -= total_blocks;
87 wl1271_debug(DEBUG_TX,
88 "tx_allocate: size: %d, blocks: %d, id: %d",
89 total_len, total_blocks, id);
91 wl1271_free_tx_id(wl, id);
97 static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct sk_buff *skb,
98 u32 extra, struct ieee80211_tx_info *control)
101 struct wl1271_tx_hw_descr *desc;
106 desc = (struct wl1271_tx_hw_descr *) skb->data;
108 /* relocate space for security header */
110 void *framestart = skb->data + sizeof(*desc);
111 u16 fc = *(u16 *)(framestart + extra);
112 int hdrlen = ieee80211_hdrlen(cpu_to_le16(fc));
113 memmove(framestart, framestart + extra, hdrlen);
116 /* configure packet life time */
118 hosttime = (timespec_to_ns(&ts) >> 10);
119 desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
120 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
122 /* configure the tx attributes */
123 tx_attr = wl->session_counter << TX_HW_ATTR_OFST_SESSION_COUNTER;
125 /* queue (we use same identifiers for tid's and ac's */
126 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
129 desc->aid = TX_HW_DEFAULT_AID;
132 /* align the length (and store in terms of words) */
133 pad = WL1271_TX_ALIGN(skb->len);
134 desc->length = cpu_to_le16(pad >> 2);
136 /* calculate number of padding bytes */
137 pad = pad - skb->len;
138 tx_attr |= pad << TX_HW_ATTR_OFST_LAST_WORD_PAD;
140 /* if the packets are destined for AP (have a STA entry) send them
141 with AP rate policies, otherwise use default basic rates */
142 if (control->control.sta)
143 tx_attr |= ACX_TX_AP_FULL_RATE << TX_HW_ATTR_OFST_RATE_POLICY;
145 desc->tx_attr = cpu_to_le16(tx_attr);
147 wl1271_debug(DEBUG_TX, "tx_fill_hdr: pad: %d", pad);
150 /* caller must hold wl->mutex */
151 static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct sk_buff *skb,
154 struct ieee80211_tx_info *info;
163 info = IEEE80211_SKB_CB(skb);
165 if (info->control.hw_key &&
166 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
167 extra = WL1271_TKIP_IV_SPACE;
169 if (info->control.hw_key) {
170 idx = info->control.hw_key->hw_key_idx;
172 /* FIXME: do we have to do this if we're not using WEP? */
173 if (unlikely(wl->default_key != idx)) {
174 ret = wl1271_cmd_set_default_wep_key(wl, idx);
177 wl->default_key = idx;
181 ret = wl1271_tx_allocate(wl, skb, extra, buf_offset);
185 wl1271_tx_fill_hdr(wl, skb, extra, info);
188 * The length of each packet is stored in terms of words. Thus, we must
189 * pad the skb data to make sure its length is aligned.
190 * The number of padding bytes is computed and set in wl1271_tx_fill_hdr
192 total_len = WL1271_TX_ALIGN(skb->len);
193 memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
194 memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
199 u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set)
201 struct ieee80211_supported_band *band;
202 u32 enabled_rates = 0;
205 band = wl->hw->wiphy->bands[wl->band];
206 for (bit = 0; bit < band->n_bitrates; bit++) {
208 enabled_rates |= band->bitrates[bit].hw_value;
212 #ifdef CONFIG_WL12XX_HT
213 /* MCS rates indication are on bits 16 - 23 */
214 rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
216 for (bit = 0; bit < 8; bit++) {
218 enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
223 return enabled_rates;
226 static void handle_tx_low_watermark(struct wl1271 *wl)
230 if (test_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags) &&
231 skb_queue_len(&wl->tx_queue) <= WL1271_TX_QUEUE_LOW_WATERMARK) {
232 /* firmware buffer has space, restart queues */
233 spin_lock_irqsave(&wl->wl_lock, flags);
234 ieee80211_wake_queues(wl->hw);
235 clear_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags);
236 spin_unlock_irqrestore(&wl->wl_lock, flags);
240 void wl1271_tx_work_locked(struct wl1271 *wl)
243 bool woken_up = false;
246 bool sent_packets = false;
249 /* check if the rates supported by the AP have changed */
250 if (unlikely(test_and_clear_bit(WL1271_FLAG_STA_RATES_CHANGED,
254 spin_lock_irqsave(&wl->wl_lock, flags);
255 sta_rates = wl->sta_rate_set;
256 spin_unlock_irqrestore(&wl->wl_lock, flags);
259 if (unlikely(wl->state == WL1271_STATE_OFF))
262 /* if rates have changed, re-configure the rate policy */
263 if (unlikely(sta_rates)) {
264 ret = wl1271_ps_elp_wakeup(wl, false);
269 wl->rate_set = wl1271_tx_enabled_rates_get(wl, sta_rates);
270 wl1271_acx_rate_policies(wl);
273 while ((skb = skb_dequeue(&wl->tx_queue))) {
275 ret = wl1271_ps_elp_wakeup(wl, false);
281 ret = wl1271_prepare_tx_frame(wl, skb, buf_offset);
282 if (ret == -EAGAIN) {
284 * Aggregation buffer is full.
285 * Flush buffer and try again.
287 skb_queue_head(&wl->tx_queue, skb);
288 wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
293 } else if (ret == -EBUSY) {
295 * Firmware buffer is full.
296 * Queue back last skb, and stop aggregating.
298 skb_queue_head(&wl->tx_queue, skb);
299 /* No work left, avoid scheduling redundant tx work */
300 set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
302 } else if (ret < 0) {
307 wl->tx_packets_count++;
312 wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
317 /* interrupt the firmware with the new packets */
318 wl1271_write32(wl, WL1271_HOST_WR_ACCESS, wl->tx_packets_count);
319 handle_tx_low_watermark(wl);
324 wl1271_ps_elp_sleep(wl);
327 void wl1271_tx_work(struct work_struct *work)
329 struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
331 mutex_lock(&wl->mutex);
332 wl1271_tx_work_locked(wl);
333 mutex_unlock(&wl->mutex);
336 static void wl1271_tx_complete_packet(struct wl1271 *wl,
337 struct wl1271_tx_hw_res_descr *result)
339 struct ieee80211_tx_info *info;
345 /* check for id legality */
346 if (unlikely(id >= ACX_TX_DESCRIPTORS || wl->tx_frames[id] == NULL)) {
347 wl1271_warning("TX result illegal id: %d", id);
351 skb = wl->tx_frames[id];
352 info = IEEE80211_SKB_CB(skb);
354 /* update the TX status info */
355 if (result->status == TX_SUCCESS) {
356 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
357 info->flags |= IEEE80211_TX_STAT_ACK;
358 rate = wl1271_rate_to_idx(result->rate_class_index, wl->band);
359 retries = result->ack_failures;
360 } else if (result->status == TX_RETRY_EXCEEDED) {
361 wl->stats.excessive_retries++;
362 retries = result->ack_failures;
365 info->status.rates[0].idx = rate;
366 info->status.rates[0].count = retries;
367 info->status.rates[0].flags = 0;
368 info->status.ack_signal = -1;
370 wl->stats.retry_count += result->ack_failures;
372 /* update security sequence number */
373 wl->tx_security_seq += (result->lsb_security_sequence_number -
374 wl->tx_security_last_seq);
375 wl->tx_security_last_seq = result->lsb_security_sequence_number;
377 /* remove private header from packet */
378 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
380 /* remove TKIP header space if present */
381 if (info->control.hw_key &&
382 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
383 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
384 memmove(skb->data + WL1271_TKIP_IV_SPACE, skb->data, hdrlen);
385 skb_pull(skb, WL1271_TKIP_IV_SPACE);
388 wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
390 result->id, skb, result->ack_failures,
391 result->rate_class_index, result->status);
393 /* return the packet to the stack */
394 ieee80211_tx_status(wl->hw, skb);
395 wl1271_free_tx_id(wl, result->id);
398 /* Called upon reception of a TX complete interrupt */
399 void wl1271_tx_complete(struct wl1271 *wl)
401 struct wl1271_acx_mem_map *memmap =
402 (struct wl1271_acx_mem_map *)wl->target_mem_map;
403 u32 count, fw_counter;
406 /* read the tx results from the chipset */
407 wl1271_read(wl, le32_to_cpu(memmap->tx_result),
408 wl->tx_res_if, sizeof(*wl->tx_res_if), false);
409 fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
411 /* write host counter to chipset (to ack) */
412 wl1271_write32(wl, le32_to_cpu(memmap->tx_result) +
413 offsetof(struct wl1271_tx_hw_res_if,
414 tx_result_host_counter), fw_counter);
416 count = fw_counter - wl->tx_results_count;
417 wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
419 /* verify that the result buffer is not getting overrun */
420 if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
421 wl1271_warning("TX result overflow from chipset: %d", count);
423 /* process the results */
424 for (i = 0; i < count; i++) {
425 struct wl1271_tx_hw_res_descr *result;
426 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
428 /* process the packet */
429 result = &(wl->tx_res_if->tx_results_queue[offset]);
430 wl1271_tx_complete_packet(wl, result);
432 wl->tx_results_count++;
436 /* caller must hold wl->mutex */
437 void wl1271_tx_reset(struct wl1271 *wl)
443 while ((skb = skb_dequeue(&wl->tx_queue))) {
444 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
445 ieee80211_tx_status(wl->hw, skb);
449 * Make sure the driver is at a consistent state, in case this
450 * function is called from a context other than interface removal.
452 handle_tx_low_watermark(wl);
454 for (i = 0; i < ACX_TX_DESCRIPTORS; i++)
455 if (wl->tx_frames[i] != NULL) {
456 skb = wl->tx_frames[i];
457 wl1271_free_tx_id(wl, i);
458 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
459 ieee80211_tx_status(wl->hw, skb);
463 #define WL1271_TX_FLUSH_TIMEOUT 500000
465 /* caller must *NOT* hold wl->mutex */
466 void wl1271_tx_flush(struct wl1271 *wl)
468 unsigned long timeout;
469 timeout = jiffies + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
471 while (!time_after(jiffies, timeout)) {
472 mutex_lock(&wl->mutex);
473 wl1271_debug(DEBUG_TX, "flushing tx buffer: %d",
475 if ((wl->tx_frames_cnt == 0) &&
476 skb_queue_empty(&wl->tx_queue)) {
477 mutex_unlock(&wl->mutex);
480 mutex_unlock(&wl->mutex);
484 wl1271_warning("Unable to flush all TX buffers, timed out.");