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;
45 static int wl1271_tx_allocate(struct wl1271 *wl, struct sk_buff *skb, u32 extra)
47 struct wl1271_tx_hw_descr *desc;
48 u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
52 /* allocate free identifier for the packet */
53 id = wl1271_tx_id(wl, skb);
57 /* approximate the number of blocks required for this packet
59 total_blocks = total_len + TX_HW_BLOCK_SIZE - 1;
60 total_blocks = total_blocks / TX_HW_BLOCK_SIZE + TX_HW_BLOCK_SPARE;
61 if (total_blocks <= wl->tx_blocks_available) {
62 desc = (struct wl1271_tx_hw_descr *)skb_push(
63 skb, total_len - skb->len);
65 desc->extra_mem_blocks = TX_HW_BLOCK_SPARE;
66 desc->total_mem_blocks = total_blocks;
69 wl->tx_blocks_available -= total_blocks;
73 wl1271_debug(DEBUG_TX,
74 "tx_allocate: size: %d, blocks: %d, id: %d",
75 total_len, total_blocks, id);
77 wl->tx_frames[id] = NULL;
82 static int wl1271_tx_fill_hdr(struct wl1271 *wl, struct sk_buff *skb,
83 u32 extra, struct ieee80211_tx_info *control)
86 struct wl1271_tx_hw_descr *desc;
91 desc = (struct wl1271_tx_hw_descr *) skb->data;
93 /* relocate space for security header */
95 void *framestart = skb->data + sizeof(*desc);
96 u16 fc = *(u16 *)(framestart + extra);
97 int hdrlen = ieee80211_hdrlen(cpu_to_le16(fc));
98 memmove(framestart, framestart + extra, hdrlen);
101 /* configure packet life time */
103 hosttime = (timespec_to_ns(&ts) >> 10);
104 desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
105 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
107 /* configure the tx attributes */
108 tx_attr = wl->session_counter << TX_HW_ATTR_OFST_SESSION_COUNTER;
111 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
112 desc->tid = wl1271_tx_ac_to_tid(ac);
114 desc->aid = TX_HW_DEFAULT_AID;
117 /* align the length (and store in terms of words) */
118 pad = WL1271_TX_ALIGN(skb->len);
119 desc->length = cpu_to_le16(pad >> 2);
121 /* calculate number of padding bytes */
122 pad = pad - skb->len;
123 tx_attr |= pad << TX_HW_ATTR_OFST_LAST_WORD_PAD;
125 /* if the packets are destined for AP (have a STA entry) send them
126 with AP rate policies, otherwise use default basic rates */
127 if (control->control.sta)
128 tx_attr |= ACX_TX_AP_FULL_RATE << TX_HW_ATTR_OFST_RATE_POLICY;
130 desc->tx_attr = cpu_to_le16(tx_attr);
132 wl1271_debug(DEBUG_TX, "tx_fill_hdr: pad: %d", pad);
136 static int wl1271_tx_send_packet(struct wl1271 *wl, struct sk_buff *skb,
137 struct ieee80211_tx_info *control)
140 struct wl1271_tx_hw_descr *desc;
143 /* FIXME: This is a workaround for getting non-aligned packets.
144 This happens at least with EAPOL packets from the user space.
145 Our DMA requires packets to be aligned on a 4-byte boundary.
147 if (unlikely((long)skb->data & 0x03)) {
148 int offset = (4 - (long)skb->data) & 0x03;
149 wl1271_debug(DEBUG_TX, "skb offset %d", offset);
151 /* check whether the current skb can be used */
152 if (!skb_cloned(skb) && (skb_tailroom(skb) >= offset)) {
153 unsigned char *src = skb->data;
155 /* align the buffer on a 4-byte boundary */
156 skb_reserve(skb, offset);
157 memmove(skb->data, src, skb->len);
159 wl1271_info("No handler, fixme!");
164 len = WL1271_TX_ALIGN(skb->len);
166 /* perform a fixed address block write with the packet */
167 wl1271_write(wl, WL1271_SLV_MEM_DATA, skb->data, len, true);
169 /* write packet new counter into the write access register */
170 wl->tx_packets_count++;
172 desc = (struct wl1271_tx_hw_descr *) skb->data;
173 wl1271_debug(DEBUG_TX, "tx id %u skb 0x%p payload %u (%u words)",
174 desc->id, skb, len, desc->length);
179 /* caller must hold wl->mutex */
180 static int wl1271_tx_frame(struct wl1271 *wl, struct sk_buff *skb)
182 struct ieee80211_tx_info *info;
190 info = IEEE80211_SKB_CB(skb);
192 if (info->control.hw_key &&
193 info->control.hw_key->alg == ALG_TKIP)
194 extra = WL1271_TKIP_IV_SPACE;
196 if (info->control.hw_key) {
197 idx = info->control.hw_key->hw_key_idx;
199 /* FIXME: do we have to do this if we're not using WEP? */
200 if (unlikely(wl->default_key != idx)) {
201 ret = wl1271_cmd_set_default_wep_key(wl, idx);
204 wl->default_key = idx;
208 ret = wl1271_tx_allocate(wl, skb, extra);
212 ret = wl1271_tx_fill_hdr(wl, skb, extra, info);
216 ret = wl1271_tx_send_packet(wl, skb, info);
223 u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set)
225 struct ieee80211_supported_band *band;
226 u32 enabled_rates = 0;
229 band = wl->hw->wiphy->bands[wl->band];
230 for (bit = 0; bit < band->n_bitrates; bit++) {
232 enabled_rates |= band->bitrates[bit].hw_value;
236 return enabled_rates;
239 void wl1271_tx_work(struct work_struct *work)
241 struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
243 bool woken_up = false;
245 u32 prev_tx_packets_count;
248 /* check if the rates supported by the AP have changed */
249 if (unlikely(test_and_clear_bit(WL1271_FLAG_STA_RATES_CHANGED,
252 spin_lock_irqsave(&wl->wl_lock, flags);
253 sta_rates = wl->sta_rate_set;
254 spin_unlock_irqrestore(&wl->wl_lock, flags);
257 mutex_lock(&wl->mutex);
259 if (unlikely(wl->state == WL1271_STATE_OFF))
262 prev_tx_packets_count = wl->tx_packets_count;
264 /* if rates have changed, re-configure the rate policy */
265 if (unlikely(sta_rates)) {
266 wl->rate_set = wl1271_tx_enabled_rates_get(wl, sta_rates);
267 wl1271_acx_rate_policies(wl);
270 while ((skb = skb_dequeue(&wl->tx_queue))) {
272 ret = wl1271_ps_elp_wakeup(wl, false);
278 ret = wl1271_tx_frame(wl, skb);
280 /* firmware buffer is full, lets stop transmitting. */
281 skb_queue_head(&wl->tx_queue, skb);
283 } else if (ret < 0) {
290 /* interrupt the firmware with the new packets */
291 if (prev_tx_packets_count != wl->tx_packets_count)
292 wl1271_write32(wl, WL1271_HOST_WR_ACCESS, wl->tx_packets_count);
296 wl1271_ps_elp_sleep(wl);
298 mutex_unlock(&wl->mutex);
301 static void wl1271_tx_complete_packet(struct wl1271 *wl,
302 struct wl1271_tx_hw_res_descr *result)
304 struct ieee80211_tx_info *info;
310 /* check for id legality */
311 if (unlikely(id >= ACX_TX_DESCRIPTORS || wl->tx_frames[id] == NULL)) {
312 wl1271_warning("TX result illegal id: %d", id);
316 skb = wl->tx_frames[id];
317 info = IEEE80211_SKB_CB(skb);
319 /* update the TX status info */
320 if (result->status == TX_SUCCESS) {
321 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
322 info->flags |= IEEE80211_TX_STAT_ACK;
323 rate = wl1271_rate_to_idx(wl, result->rate_class_index);
324 retries = result->ack_failures;
325 } else if (result->status == TX_RETRY_EXCEEDED) {
326 wl->stats.excessive_retries++;
327 retries = result->ack_failures;
330 info->status.rates[0].idx = rate;
331 info->status.rates[0].count = retries;
332 info->status.rates[0].flags = 0;
333 info->status.ack_signal = -1;
335 wl->stats.retry_count += result->ack_failures;
337 /* update security sequence number */
338 wl->tx_security_seq += (result->lsb_security_sequence_number -
339 wl->tx_security_last_seq);
340 wl->tx_security_last_seq = result->lsb_security_sequence_number;
342 /* remove private header from packet */
343 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
345 /* remove TKIP header space if present */
346 if (info->control.hw_key &&
347 info->control.hw_key->alg == ALG_TKIP) {
348 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
349 memmove(skb->data + WL1271_TKIP_IV_SPACE, skb->data, hdrlen);
350 skb_pull(skb, WL1271_TKIP_IV_SPACE);
353 wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
355 result->id, skb, result->ack_failures,
356 result->rate_class_index, result->status);
358 /* return the packet to the stack */
359 ieee80211_tx_status(wl->hw, skb);
360 wl->tx_frames[result->id] = NULL;
363 /* Called upon reception of a TX complete interrupt */
364 void wl1271_tx_complete(struct wl1271 *wl)
366 struct wl1271_acx_mem_map *memmap =
367 (struct wl1271_acx_mem_map *)wl->target_mem_map;
368 u32 count, fw_counter;
371 /* read the tx results from the chipset */
372 wl1271_read(wl, le32_to_cpu(memmap->tx_result),
373 wl->tx_res_if, sizeof(*wl->tx_res_if), false);
374 fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
376 /* write host counter to chipset (to ack) */
377 wl1271_write32(wl, le32_to_cpu(memmap->tx_result) +
378 offsetof(struct wl1271_tx_hw_res_if,
379 tx_result_host_counter), fw_counter);
381 count = fw_counter - wl->tx_results_count;
382 wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
384 /* verify that the result buffer is not getting overrun */
385 if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
386 wl1271_warning("TX result overflow from chipset: %d", count);
388 /* process the results */
389 for (i = 0; i < count; i++) {
390 struct wl1271_tx_hw_res_descr *result;
391 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
393 /* process the packet */
394 result = &(wl->tx_res_if->tx_results_queue[offset]);
395 wl1271_tx_complete_packet(wl, result);
397 wl->tx_results_count++;
400 if (test_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags) &&
401 skb_queue_len(&wl->tx_queue) <= WL1271_TX_QUEUE_LOW_WATERMARK) {
404 /* firmware buffer has space, restart queues */
405 wl1271_debug(DEBUG_TX, "tx_complete: waking queues");
406 spin_lock_irqsave(&wl->wl_lock, flags);
407 ieee80211_wake_queues(wl->hw);
408 clear_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags);
409 spin_unlock_irqrestore(&wl->wl_lock, flags);
410 ieee80211_queue_work(wl->hw, &wl->tx_work);
414 /* caller must hold wl->mutex */
415 void wl1271_tx_flush(struct wl1271 *wl)
421 /* control->flags = 0; FIXME */
423 while ((skb = skb_dequeue(&wl->tx_queue))) {
424 wl1271_debug(DEBUG_TX, "flushing skb 0x%p", skb);
425 ieee80211_tx_status(wl->hw, skb);
428 for (i = 0; i < ACX_TX_DESCRIPTORS; i++)
429 if (wl->tx_frames[i] != NULL) {
430 skb = wl->tx_frames[i];
431 wl->tx_frames[i] = NULL;
432 ieee80211_tx_status(wl->hw, skb);