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>
28 #include "wl1271_io.h"
29 #include "wl1271_reg.h"
30 #include "wl1271_ps.h"
31 #include "wl1271_tx.h"
33 static int wl1271_tx_id(struct wl1271 *wl, struct sk_buff *skb)
36 for (i = 0; i < ACX_TX_DESCRIPTORS; i++)
37 if (wl->tx_frames[i] == NULL) {
38 wl->tx_frames[i] = skb;
46 static int wl1271_tx_allocate(struct wl1271 *wl, struct sk_buff *skb, u32 extra,
49 struct wl1271_tx_hw_descr *desc;
50 u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
54 if (buf_offset + total_len > WL1271_AGGR_BUFFER_SIZE)
57 /* allocate free identifier for the packet */
58 id = wl1271_tx_id(wl, skb);
62 /* approximate the number of blocks required for this packet
64 total_blocks = total_len + TX_HW_BLOCK_SIZE - 1;
65 total_blocks = total_blocks / TX_HW_BLOCK_SIZE + TX_HW_BLOCK_SPARE;
66 if (total_blocks <= wl->tx_blocks_available) {
67 desc = (struct wl1271_tx_hw_descr *)skb_push(
68 skb, total_len - skb->len);
70 desc->extra_mem_blocks = TX_HW_BLOCK_SPARE;
71 desc->total_mem_blocks = total_blocks;
74 wl->tx_blocks_available -= total_blocks;
78 wl1271_debug(DEBUG_TX,
79 "tx_allocate: size: %d, blocks: %d, id: %d",
80 total_len, total_blocks, id);
82 wl->tx_frames[id] = NULL;
89 static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct sk_buff *skb,
90 u32 extra, struct ieee80211_tx_info *control)
93 struct wl1271_tx_hw_descr *desc;
98 desc = (struct wl1271_tx_hw_descr *) skb->data;
100 /* relocate space for security header */
102 void *framestart = skb->data + sizeof(*desc);
103 u16 fc = *(u16 *)(framestart + extra);
104 int hdrlen = ieee80211_hdrlen(cpu_to_le16(fc));
105 memmove(framestart, framestart + extra, hdrlen);
108 /* configure packet life time */
110 hosttime = (timespec_to_ns(&ts) >> 10);
111 desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
112 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
114 /* configure the tx attributes */
115 tx_attr = wl->session_counter << TX_HW_ATTR_OFST_SESSION_COUNTER;
117 /* queue (we use same identifiers for tid's and ac's */
118 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
121 desc->aid = TX_HW_DEFAULT_AID;
124 /* align the length (and store in terms of words) */
125 pad = WL1271_TX_ALIGN(skb->len);
126 desc->length = cpu_to_le16(pad >> 2);
128 /* calculate number of padding bytes */
129 pad = pad - skb->len;
130 tx_attr |= pad << TX_HW_ATTR_OFST_LAST_WORD_PAD;
132 /* if the packets are destined for AP (have a STA entry) send them
133 with AP rate policies, otherwise use default basic rates */
134 if (control->control.sta)
135 tx_attr |= ACX_TX_AP_FULL_RATE << TX_HW_ATTR_OFST_RATE_POLICY;
137 desc->tx_attr = cpu_to_le16(tx_attr);
139 wl1271_debug(DEBUG_TX, "tx_fill_hdr: pad: %d", pad);
142 /* caller must hold wl->mutex */
143 static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct sk_buff *skb,
146 struct ieee80211_tx_info *info;
155 info = IEEE80211_SKB_CB(skb);
157 if (info->control.hw_key &&
158 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
159 extra = WL1271_TKIP_IV_SPACE;
161 if (info->control.hw_key) {
162 idx = info->control.hw_key->hw_key_idx;
164 /* FIXME: do we have to do this if we're not using WEP? */
165 if (unlikely(wl->default_key != idx)) {
166 ret = wl1271_cmd_set_default_wep_key(wl, idx);
169 wl->default_key = idx;
173 ret = wl1271_tx_allocate(wl, skb, extra, buf_offset);
177 wl1271_tx_fill_hdr(wl, skb, extra, info);
180 * The length of each packet is stored in terms of words. Thus, we must
181 * pad the skb data to make sure its length is aligned.
182 * The number of padding bytes is computed and set in wl1271_tx_fill_hdr
184 total_len = WL1271_TX_ALIGN(skb->len);
185 memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
186 memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
191 u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set)
193 struct ieee80211_supported_band *band;
194 u32 enabled_rates = 0;
197 band = wl->hw->wiphy->bands[wl->band];
198 for (bit = 0; bit < band->n_bitrates; bit++) {
200 enabled_rates |= band->bitrates[bit].hw_value;
204 return enabled_rates;
207 void wl1271_tx_work_locked(struct wl1271 *wl)
210 bool woken_up = false;
213 bool sent_packets = false;
216 /* check if the rates supported by the AP have changed */
217 if (unlikely(test_and_clear_bit(WL1271_FLAG_STA_RATES_CHANGED,
220 spin_lock_irqsave(&wl->wl_lock, flags);
221 sta_rates = wl->sta_rate_set;
222 spin_unlock_irqrestore(&wl->wl_lock, flags);
225 if (unlikely(wl->state == WL1271_STATE_OFF))
228 /* if rates have changed, re-configure the rate policy */
229 if (unlikely(sta_rates)) {
230 wl->rate_set = wl1271_tx_enabled_rates_get(wl, sta_rates);
231 wl1271_acx_rate_policies(wl);
234 while ((skb = skb_dequeue(&wl->tx_queue))) {
236 ret = wl1271_ps_elp_wakeup(wl, false);
242 ret = wl1271_prepare_tx_frame(wl, skb, buf_offset);
243 if (ret == -EAGAIN) {
245 * Aggregation buffer is full.
246 * Flush buffer and try again.
248 skb_queue_head(&wl->tx_queue, skb);
249 wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
254 } else if (ret == -EBUSY) {
256 * Firmware buffer is full.
257 * Queue back last skb, and stop aggregating.
259 skb_queue_head(&wl->tx_queue, skb);
260 /* No work left, avoid scheduling redundant tx work */
261 set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
263 } else if (ret < 0) {
268 wl->tx_packets_count++;
273 wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
278 /* interrupt the firmware with the new packets */
279 wl1271_write32(wl, WL1271_HOST_WR_ACCESS, wl->tx_packets_count);
284 wl1271_ps_elp_sleep(wl);
287 void wl1271_tx_work(struct work_struct *work)
289 struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
291 mutex_lock(&wl->mutex);
292 wl1271_tx_work_locked(wl);
293 mutex_unlock(&wl->mutex);
296 static void wl1271_tx_complete_packet(struct wl1271 *wl,
297 struct wl1271_tx_hw_res_descr *result)
299 struct ieee80211_tx_info *info;
305 /* check for id legality */
306 if (unlikely(id >= ACX_TX_DESCRIPTORS || wl->tx_frames[id] == NULL)) {
307 wl1271_warning("TX result illegal id: %d", id);
311 skb = wl->tx_frames[id];
312 info = IEEE80211_SKB_CB(skb);
314 /* update the TX status info */
315 if (result->status == TX_SUCCESS) {
316 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
317 info->flags |= IEEE80211_TX_STAT_ACK;
318 rate = wl1271_rate_to_idx(wl, result->rate_class_index);
319 retries = result->ack_failures;
320 } else if (result->status == TX_RETRY_EXCEEDED) {
321 wl->stats.excessive_retries++;
322 retries = result->ack_failures;
325 info->status.rates[0].idx = rate;
326 info->status.rates[0].count = retries;
327 info->status.rates[0].flags = 0;
328 info->status.ack_signal = -1;
330 wl->stats.retry_count += result->ack_failures;
332 /* update security sequence number */
333 wl->tx_security_seq += (result->lsb_security_sequence_number -
334 wl->tx_security_last_seq);
335 wl->tx_security_last_seq = result->lsb_security_sequence_number;
337 /* remove private header from packet */
338 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
340 /* remove TKIP header space if present */
341 if (info->control.hw_key &&
342 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
343 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
344 memmove(skb->data + WL1271_TKIP_IV_SPACE, skb->data, hdrlen);
345 skb_pull(skb, WL1271_TKIP_IV_SPACE);
348 wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
350 result->id, skb, result->ack_failures,
351 result->rate_class_index, result->status);
353 /* return the packet to the stack */
354 ieee80211_tx_status(wl->hw, skb);
355 wl->tx_frames[result->id] = NULL;
359 /* Called upon reception of a TX complete interrupt */
360 void wl1271_tx_complete(struct wl1271 *wl)
362 struct wl1271_acx_mem_map *memmap =
363 (struct wl1271_acx_mem_map *)wl->target_mem_map;
364 u32 count, fw_counter;
367 /* read the tx results from the chipset */
368 wl1271_read(wl, le32_to_cpu(memmap->tx_result),
369 wl->tx_res_if, sizeof(*wl->tx_res_if), false);
370 fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
372 /* write host counter to chipset (to ack) */
373 wl1271_write32(wl, le32_to_cpu(memmap->tx_result) +
374 offsetof(struct wl1271_tx_hw_res_if,
375 tx_result_host_counter), fw_counter);
377 count = fw_counter - wl->tx_results_count;
378 wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
380 /* verify that the result buffer is not getting overrun */
381 if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
382 wl1271_warning("TX result overflow from chipset: %d", count);
384 /* process the results */
385 for (i = 0; i < count; i++) {
386 struct wl1271_tx_hw_res_descr *result;
387 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
389 /* process the packet */
390 result = &(wl->tx_res_if->tx_results_queue[offset]);
391 wl1271_tx_complete_packet(wl, result);
393 wl->tx_results_count++;
396 if (test_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags) &&
397 skb_queue_len(&wl->tx_queue) <= WL1271_TX_QUEUE_LOW_WATERMARK) {
400 /* firmware buffer has space, restart queues */
401 wl1271_debug(DEBUG_TX, "tx_complete: waking queues");
402 spin_lock_irqsave(&wl->wl_lock, flags);
403 ieee80211_wake_queues(wl->hw);
404 clear_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags);
405 spin_unlock_irqrestore(&wl->wl_lock, flags);
406 ieee80211_queue_work(wl->hw, &wl->tx_work);
410 /* caller must hold wl->mutex */
411 void wl1271_tx_reset(struct wl1271 *wl)
417 while ((skb = skb_dequeue(&wl->tx_queue))) {
418 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
419 ieee80211_tx_status(wl->hw, skb);
422 for (i = 0; i < ACX_TX_DESCRIPTORS; i++)
423 if (wl->tx_frames[i] != NULL) {
424 skb = wl->tx_frames[i];
425 wl->tx_frames[i] = NULL;
426 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
427 ieee80211_tx_status(wl->hw, skb);
429 wl->tx_frames_cnt = 0;
432 #define WL1271_TX_FLUSH_TIMEOUT 500000
434 /* caller must *NOT* hold wl->mutex */
435 void wl1271_tx_flush(struct wl1271 *wl)
437 unsigned long timeout;
438 timeout = jiffies + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
440 while (!time_after(jiffies, timeout)) {
441 mutex_lock(&wl->mutex);
442 wl1271_debug(DEBUG_TX, "flushing tx buffer: %d",
444 if ((wl->tx_frames_cnt == 0) &&
445 skb_queue_empty(&wl->tx_queue)) {
446 mutex_unlock(&wl->mutex);
449 mutex_unlock(&wl->mutex);
453 wl1271_warning("Unable to flush all TX buffers, timed out.");