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_spi.h"
29 #include "wl1271_io.h"
30 #include "wl1271_reg.h"
31 #include "wl1271_ps.h"
32 #include "wl1271_tx.h"
34 static int wl1271_tx_id(struct wl1271 *wl, struct sk_buff *skb)
37 for (i = 0; i < ACX_TX_DESCRIPTORS; i++)
38 if (wl->tx_frames[i] == NULL) {
39 wl->tx_frames[i] = skb;
46 static int wl1271_tx_allocate(struct wl1271 *wl, struct sk_buff *skb, u32 extra)
48 struct wl1271_tx_hw_descr *desc;
49 u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
50 u32 total_blocks, excluded;
53 /* allocate free identifier for the packet */
54 id = wl1271_tx_id(wl, skb);
58 /* approximate the number of blocks required for this packet
60 /* FIXME: try to figure out what is done here and make it cleaner */
61 total_blocks = (total_len + 20) >> TX_HW_BLOCK_SHIFT_DIV;
62 excluded = (total_blocks << 2) + ((total_len + 20) & 0xff) + 34;
63 total_blocks += (excluded > 252) ? 2 : 1;
64 total_blocks += 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;
87 static int wl1271_tx_fill_hdr(struct wl1271 *wl, struct sk_buff *skb,
88 u32 extra, struct ieee80211_tx_info *control)
90 struct wl1271_tx_hw_descr *desc;
94 desc = (struct wl1271_tx_hw_descr *) skb->data;
96 /* relocate space for security header */
98 void *framestart = skb->data + sizeof(*desc);
99 u16 fc = *(u16 *)(framestart + extra);
100 int hdrlen = ieee80211_hdrlen(cpu_to_le16(fc));
101 memmove(framestart, framestart + extra, hdrlen);
104 /* configure packet life time */
105 desc->start_time = cpu_to_le32(jiffies_to_usecs(jiffies) -
107 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
109 /* configure the tx attributes */
110 tx_attr = wl->session_counter << TX_HW_ATTR_OFST_SESSION_COUNTER;
113 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
114 desc->tid = wl1271_tx_ac_to_tid(ac);
116 desc->aid = TX_HW_DEFAULT_AID;
119 /* align the length (and store in terms of words) */
120 pad = WL1271_TX_ALIGN(skb->len);
121 desc->length = cpu_to_le16(pad >> 2);
123 /* calculate number of padding bytes */
124 pad = pad - skb->len;
125 tx_attr |= pad << TX_HW_ATTR_OFST_LAST_WORD_PAD;
127 /* if the packets are destined for AP (have a STA entry) send them
128 with AP rate policies, otherwise use default basic rates */
129 if (control->control.sta)
130 tx_attr |= ACX_TX_AP_FULL_RATE << TX_HW_ATTR_OFST_RATE_POLICY;
132 desc->tx_attr = cpu_to_le16(tx_attr);
134 wl1271_debug(DEBUG_TX, "tx_fill_hdr: pad: %d", pad);
138 static int wl1271_tx_send_packet(struct wl1271 *wl, struct sk_buff *skb,
139 struct ieee80211_tx_info *control)
142 struct wl1271_tx_hw_descr *desc;
145 /* FIXME: This is a workaround for getting non-aligned packets.
146 This happens at least with EAPOL packets from the user space.
147 Our DMA requires packets to be aligned on a 4-byte boundary.
149 if (unlikely((long)skb->data & 0x03)) {
150 int offset = (4 - (long)skb->data) & 0x03;
151 wl1271_debug(DEBUG_TX, "skb offset %d", offset);
153 /* check whether the current skb can be used */
154 if (!skb_cloned(skb) && (skb_tailroom(skb) >= offset)) {
155 unsigned char *src = skb->data;
157 /* align the buffer on a 4-byte boundary */
158 skb_reserve(skb, offset);
159 memmove(skb->data, src, skb->len);
161 wl1271_info("No handler, fixme!");
166 len = WL1271_TX_ALIGN(skb->len);
168 /* perform a fixed address block write with the packet */
169 wl1271_write(wl, WL1271_SLV_MEM_DATA, skb->data, len, true);
171 /* write packet new counter into the write access register */
172 wl->tx_packets_count++;
173 wl1271_write32(wl, WL1271_HOST_WR_ACCESS, wl->tx_packets_count);
175 desc = (struct wl1271_tx_hw_descr *) skb->data;
176 wl1271_debug(DEBUG_TX, "tx id %u skb 0x%p payload %u (%u words)",
177 desc->id, skb, len, desc->length);
182 /* caller must hold wl->mutex */
183 static int wl1271_tx_frame(struct wl1271 *wl, struct sk_buff *skb)
185 struct ieee80211_tx_info *info;
193 info = IEEE80211_SKB_CB(skb);
195 if (info->control.hw_key &&
196 info->control.hw_key->alg == ALG_TKIP)
197 extra = WL1271_TKIP_IV_SPACE;
199 if (info->control.hw_key) {
200 idx = info->control.hw_key->hw_key_idx;
202 /* FIXME: do we have to do this if we're not using WEP? */
203 if (unlikely(wl->default_key != idx)) {
204 ret = wl1271_cmd_set_default_wep_key(wl, idx);
207 wl->default_key = idx;
211 ret = wl1271_tx_allocate(wl, skb, extra);
215 ret = wl1271_tx_fill_hdr(wl, skb, extra, info);
219 ret = wl1271_tx_send_packet(wl, skb, info);
226 static u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set)
228 struct ieee80211_supported_band *band;
229 u32 enabled_rates = 0;
232 band = wl->hw->wiphy->bands[wl->band];
233 for (bit = 0; bit < band->n_bitrates; bit++) {
235 enabled_rates |= band->bitrates[bit].hw_value;
239 return enabled_rates;
242 void wl1271_tx_work(struct work_struct *work)
244 struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
246 bool woken_up = false;
250 /* check if the rates supported by the AP have changed */
251 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 mutex_lock(&wl->mutex);
261 if (unlikely(wl->state == WL1271_STATE_OFF))
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, stop queues */
281 wl1271_debug(DEBUG_TX, "tx_work: fw buffer full, "
283 ieee80211_stop_queues(wl->hw);
284 set_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags);
285 skb_queue_head(&wl->tx_queue, skb);
287 } else if (ret < 0) {
290 } else if (test_and_clear_bit(WL1271_FLAG_TX_QUEUE_STOPPED,
292 /* firmware buffer has space, restart queues */
293 wl1271_debug(DEBUG_TX,
294 "complete_packet: waking queues");
295 ieee80211_wake_queues(wl->hw);
301 wl1271_ps_elp_sleep(wl);
303 mutex_unlock(&wl->mutex);
306 static void wl1271_tx_complete_packet(struct wl1271 *wl,
307 struct wl1271_tx_hw_res_descr *result)
309 struct ieee80211_tx_info *info;
314 /* check for id legality */
315 if (id >= ACX_TX_DESCRIPTORS || wl->tx_frames[id] == NULL) {
316 wl1271_warning("TX result illegal id: %d", id);
320 skb = wl->tx_frames[id];
321 info = IEEE80211_SKB_CB(skb);
323 /* update packet status */
324 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) {
325 if (result->status == TX_SUCCESS)
326 info->flags |= IEEE80211_TX_STAT_ACK;
327 if (result->status & TX_RETRY_EXCEEDED) {
329 /* info->status.excessive_retries = 1; */
330 wl->stats.excessive_retries++;
335 /* info->status.retry_count = result->ack_failures; */
336 wl->stats.retry_count += result->ack_failures;
338 /* update security sequence number */
339 seq = wl->tx_security_seq_16 +
340 (result->lsb_security_sequence_number -
341 wl->tx_security_last_seq);
342 wl->tx_security_last_seq = result->lsb_security_sequence_number;
344 if (seq < wl->tx_security_seq_16)
345 wl->tx_security_seq_32++;
346 wl->tx_security_seq_16 = seq;
348 /* remove private header from packet */
349 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
351 /* remove TKIP header space if present */
352 if (info->control.hw_key &&
353 info->control.hw_key->alg == ALG_TKIP) {
354 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
355 memmove(skb->data + WL1271_TKIP_IV_SPACE, skb->data, hdrlen);
356 skb_pull(skb, WL1271_TKIP_IV_SPACE);
359 wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
361 result->id, skb, result->ack_failures,
362 result->rate_class_index, result->status);
364 /* return the packet to the stack */
365 ieee80211_tx_status(wl->hw, skb);
366 wl->tx_frames[result->id] = NULL;
369 /* Called upon reception of a TX complete interrupt */
370 void wl1271_tx_complete(struct wl1271 *wl, u32 count)
372 struct wl1271_acx_mem_map *memmap =
373 (struct wl1271_acx_mem_map *)wl->target_mem_map;
376 wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
378 /* read the tx results from the chipset */
379 wl1271_read(wl, le32_to_cpu(memmap->tx_result),
380 wl->tx_res_if, sizeof(*wl->tx_res_if), false);
382 /* verify that the result buffer is not getting overrun */
383 if (count > TX_HW_RESULT_QUEUE_LEN) {
384 wl1271_warning("TX result overflow from chipset: %d", count);
385 count = TX_HW_RESULT_QUEUE_LEN;
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 /* write host counter to chipset (to ack) */
401 wl1271_write32(wl, le32_to_cpu(memmap->tx_result) +
402 offsetof(struct wl1271_tx_hw_res_if,
403 tx_result_host_counter),
404 le32_to_cpu(wl->tx_res_if->tx_result_fw_counter));
407 /* caller must hold wl->mutex */
408 void wl1271_tx_flush(struct wl1271 *wl)
412 struct ieee80211_tx_info *info;
415 /* control->flags = 0; FIXME */
417 while ((skb = skb_dequeue(&wl->tx_queue))) {
418 info = IEEE80211_SKB_CB(skb);
420 wl1271_debug(DEBUG_TX, "flushing skb 0x%p", skb);
422 if (!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS))
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 info = IEEE80211_SKB_CB(skb);
433 if (!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS))
436 ieee80211_tx_status(wl->hw, skb);
437 wl->tx_frames[i] = NULL;