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OpenCloudOS-Kernel/drivers/net/wireless/wl12xx/tx.c

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/*
* This file is part of wl1271
*
* Copyright (C) 2009 Nokia Corporation
*
* Contact: Luciano Coelho <luciano.coelho@nokia.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/etherdevice.h>
#include "wl12xx.h"
#include "io.h"
#include "reg.h"
#include "ps.h"
#include "tx.h"
static int wl1271_set_default_wep_key(struct wl1271 *wl, u8 id)
{
int ret;
bool is_ap = (wl->bss_type == BSS_TYPE_AP_BSS);
if (is_ap)
ret = wl1271_cmd_set_ap_default_wep_key(wl, id);
else
ret = wl1271_cmd_set_sta_default_wep_key(wl, id);
if (ret < 0)
return ret;
wl1271_debug(DEBUG_CRYPT, "default wep key idx: %d", (int)id);
return 0;
}
static int wl1271_alloc_tx_id(struct wl1271 *wl, struct sk_buff *skb)
{
int id;
id = find_first_zero_bit(wl->tx_frames_map, ACX_TX_DESCRIPTORS);
if (id >= ACX_TX_DESCRIPTORS)
return -EBUSY;
__set_bit(id, wl->tx_frames_map);
wl->tx_frames[id] = skb;
wl->tx_frames_cnt++;
return id;
}
static void wl1271_free_tx_id(struct wl1271 *wl, int id)
{
if (__test_and_clear_bit(id, wl->tx_frames_map)) {
wl->tx_frames[id] = NULL;
wl->tx_frames_cnt--;
}
}
static void wl1271_tx_ap_update_inconnection_sta(struct wl1271 *wl,
struct sk_buff *skb)
{
struct ieee80211_hdr *hdr;
/*
* add the station to the known list before transmitting the
* authentication response. this way it won't get de-authed by FW
* when transmitting too soon.
*/
hdr = (struct ieee80211_hdr *)(skb->data +
sizeof(struct wl1271_tx_hw_descr));
if (ieee80211_is_auth(hdr->frame_control))
wl1271_acx_set_inconnection_sta(wl, hdr->addr1);
}
static void wl1271_tx_regulate_link(struct wl1271 *wl, u8 hlid)
{
bool fw_ps;
u8 tx_blks;
/* only regulate station links */
if (hlid < WL1271_AP_STA_HLID_START)
return;
fw_ps = test_bit(hlid, (unsigned long *)&wl->ap_fw_ps_map);
tx_blks = wl->links[hlid].allocated_blks;
/*
* if in FW PS and there is enough data in FW we can put the link
* into high-level PS and clean out its TX queues.
*/
if (fw_ps && tx_blks >= WL1271_PS_STA_MAX_BLOCKS)
wl1271_ps_link_start(wl, hlid, true);
}
u8 wl1271_tx_get_hlid(struct sk_buff *skb)
{
struct ieee80211_tx_info *control = IEEE80211_SKB_CB(skb);
if (control->control.sta) {
struct wl1271_station *wl_sta;
wl_sta = (struct wl1271_station *)
control->control.sta->drv_priv;
return wl_sta->hlid;
} else {
struct ieee80211_hdr *hdr;
hdr = (struct ieee80211_hdr *)skb->data;
if (ieee80211_is_mgmt(hdr->frame_control))
return WL1271_AP_GLOBAL_HLID;
else
return WL1271_AP_BROADCAST_HLID;
}
}
static int wl1271_tx_allocate(struct wl1271 *wl, struct sk_buff *skb, u32 extra,
u32 buf_offset, u8 hlid)
{
struct wl1271_tx_hw_descr *desc;
u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
u32 total_blocks;
int id, ret = -EBUSY;
if (buf_offset + total_len > WL1271_AGGR_BUFFER_SIZE)
return -EAGAIN;
/* allocate free identifier for the packet */
id = wl1271_alloc_tx_id(wl, skb);
if (id < 0)
return id;
/* approximate the number of blocks required for this packet
in the firmware */
total_blocks = total_len + TX_HW_BLOCK_SIZE - 1;
total_blocks = total_blocks / TX_HW_BLOCK_SIZE + TX_HW_BLOCK_SPARE;
if (total_blocks <= wl->tx_blocks_available) {
desc = (struct wl1271_tx_hw_descr *)skb_push(
skb, total_len - skb->len);
desc->extra_mem_blocks = TX_HW_BLOCK_SPARE;
desc->total_mem_blocks = total_blocks;
desc->id = id;
wl->tx_blocks_available -= total_blocks;
if (wl->bss_type == BSS_TYPE_AP_BSS)
wl->links[hlid].allocated_blks += total_blocks;
ret = 0;
wl1271_debug(DEBUG_TX,
"tx_allocate: size: %d, blocks: %d, id: %d",
total_len, total_blocks, id);
} else {
wl1271_free_tx_id(wl, id);
}
return ret;
}
static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct sk_buff *skb,
u32 extra, struct ieee80211_tx_info *control,
u8 hlid)
{
struct timespec ts;
struct wl1271_tx_hw_descr *desc;
int pad, ac, rate_idx;
s64 hosttime;
u16 tx_attr;
desc = (struct wl1271_tx_hw_descr *) skb->data;
/* relocate space for security header */
if (extra) {
void *framestart = skb->data + sizeof(*desc);
u16 fc = *(u16 *)(framestart + extra);
int hdrlen = ieee80211_hdrlen(cpu_to_le16(fc));
memmove(framestart, framestart + extra, hdrlen);
}
/* configure packet life time */
getnstimeofday(&ts);
hosttime = (timespec_to_ns(&ts) >> 10);
desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
if (wl->bss_type != BSS_TYPE_AP_BSS)
desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
else
desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU);
/* configure the tx attributes */
tx_attr = wl->session_counter << TX_HW_ATTR_OFST_SESSION_COUNTER;
/* queue (we use same identifiers for tid's and ac's */
ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
desc->tid = ac;
if (wl->bss_type != BSS_TYPE_AP_BSS) {
desc->aid = hlid;
/* if the packets are destined for AP (have a STA entry)
send them with AP rate policies, otherwise use default
basic rates */
if (control->control.sta)
rate_idx = ACX_TX_AP_FULL_RATE;
else
rate_idx = ACX_TX_BASIC_RATE;
} else {
desc->hlid = hlid;
switch (hlid) {
case WL1271_AP_GLOBAL_HLID:
rate_idx = ACX_TX_AP_MODE_MGMT_RATE;
break;
case WL1271_AP_BROADCAST_HLID:
rate_idx = ACX_TX_AP_MODE_BCST_RATE;
break;
default:
rate_idx = ac;
break;
}
}
tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY;
desc->reserved = 0;
/* align the length (and store in terms of words) */
pad = ALIGN(skb->len, WL1271_TX_ALIGN_TO);
desc->length = cpu_to_le16(pad >> 2);
/* calculate number of padding bytes */
pad = pad - skb->len;
tx_attr |= pad << TX_HW_ATTR_OFST_LAST_WORD_PAD;
desc->tx_attr = cpu_to_le16(tx_attr);
wl1271_debug(DEBUG_TX, "tx_fill_hdr: pad: %d hlid: %d "
"tx_attr: 0x%x len: %d life: %d mem: %d", pad, desc->hlid,
le16_to_cpu(desc->tx_attr), le16_to_cpu(desc->length),
le16_to_cpu(desc->life_time), desc->total_mem_blocks);
}
/* caller must hold wl->mutex */
static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct sk_buff *skb,
u32 buf_offset)
{
struct ieee80211_tx_info *info;
u32 extra = 0;
int ret = 0;
u32 total_len;
u8 hlid;
if (!skb)
return -EINVAL;
info = IEEE80211_SKB_CB(skb);
if (info->control.hw_key &&
info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
extra = WL1271_TKIP_IV_SPACE;
if (info->control.hw_key) {
bool is_wep;
u8 idx = info->control.hw_key->hw_key_idx;
u32 cipher = info->control.hw_key->cipher;
is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
(cipher == WLAN_CIPHER_SUITE_WEP104);
if (unlikely(is_wep && wl->default_key != idx)) {
ret = wl1271_set_default_wep_key(wl, idx);
if (ret < 0)
return ret;
wl->default_key = idx;
}
}
if (wl->bss_type == BSS_TYPE_AP_BSS)
hlid = wl1271_tx_get_hlid(skb);
else
hlid = TX_HW_DEFAULT_AID;
ret = wl1271_tx_allocate(wl, skb, extra, buf_offset, hlid);
if (ret < 0)
return ret;
if (wl->bss_type == BSS_TYPE_AP_BSS) {
wl1271_tx_ap_update_inconnection_sta(wl, skb);
wl1271_tx_regulate_link(wl, hlid);
}
wl1271_tx_fill_hdr(wl, skb, extra, info, hlid);
/*
* The length of each packet is stored in terms of words. Thus, we must
* pad the skb data to make sure its length is aligned.
* The number of padding bytes is computed and set in wl1271_tx_fill_hdr
*/
total_len = ALIGN(skb->len, WL1271_TX_ALIGN_TO);
memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
return total_len;
}
u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set)
{
struct ieee80211_supported_band *band;
u32 enabled_rates = 0;
int bit;
band = wl->hw->wiphy->bands[wl->band];
for (bit = 0; bit < band->n_bitrates; bit++) {
if (rate_set & 0x1)
enabled_rates |= band->bitrates[bit].hw_value;
rate_set >>= 1;
}
#ifdef CONFIG_WL12XX_HT
/* MCS rates indication are on bits 16 - 23 */
rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
for (bit = 0; bit < 8; bit++) {
if (rate_set & 0x1)
enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
rate_set >>= 1;
}
#endif
return enabled_rates;
}
void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
{
unsigned long flags;
if (test_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags) &&
wl->tx_queue_count <= WL1271_TX_QUEUE_LOW_WATERMARK) {
/* firmware buffer has space, restart queues */
spin_lock_irqsave(&wl->wl_lock, flags);
ieee80211_wake_queues(wl->hw);
clear_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags);
spin_unlock_irqrestore(&wl->wl_lock, flags);
}
}
static struct sk_buff *wl1271_sta_skb_dequeue(struct wl1271 *wl)
{
struct sk_buff *skb = NULL;
unsigned long flags;
skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_VO]);
if (skb)
goto out;
skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_VI]);
if (skb)
goto out;
skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_BE]);
if (skb)
goto out;
skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_BK]);
out:
if (skb) {
spin_lock_irqsave(&wl->wl_lock, flags);
wl->tx_queue_count--;
spin_unlock_irqrestore(&wl->wl_lock, flags);
}
return skb;
}
static struct sk_buff *wl1271_ap_skb_dequeue(struct wl1271 *wl)
{
struct sk_buff *skb = NULL;
unsigned long flags;
int i, h, start_hlid;
/* start from the link after the last one */
start_hlid = (wl->last_tx_hlid + 1) % AP_MAX_LINKS;
/* dequeue according to AC, round robin on each link */
for (i = 0; i < AP_MAX_LINKS; i++) {
h = (start_hlid + i) % AP_MAX_LINKS;
skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_VO]);
if (skb)
goto out;
skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_VI]);
if (skb)
goto out;
skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_BE]);
if (skb)
goto out;
skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_BK]);
if (skb)
goto out;
}
out:
if (skb) {
wl->last_tx_hlid = h;
spin_lock_irqsave(&wl->wl_lock, flags);
wl->tx_queue_count--;
spin_unlock_irqrestore(&wl->wl_lock, flags);
} else {
wl->last_tx_hlid = 0;
}
return skb;
}
static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl)
{
if (wl->bss_type == BSS_TYPE_AP_BSS)
return wl1271_ap_skb_dequeue(wl);
return wl1271_sta_skb_dequeue(wl);
}
static void wl1271_skb_queue_head(struct wl1271 *wl, struct sk_buff *skb)
{
unsigned long flags;
int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
if (wl->bss_type == BSS_TYPE_AP_BSS) {
u8 hlid = wl1271_tx_get_hlid(skb);
skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
/* make sure we dequeue the same packet next time */
wl->last_tx_hlid = (hlid + AP_MAX_LINKS - 1) % AP_MAX_LINKS;
} else {
skb_queue_head(&wl->tx_queue[q], skb);
}
spin_lock_irqsave(&wl->wl_lock, flags);
wl->tx_queue_count++;
spin_unlock_irqrestore(&wl->wl_lock, flags);
}
void wl1271_tx_work_locked(struct wl1271 *wl)
{
struct sk_buff *skb;
bool woken_up = false;
u32 buf_offset = 0;
bool sent_packets = false;
int ret;
if (unlikely(wl->state == WL1271_STATE_OFF))
goto out;
while ((skb = wl1271_skb_dequeue(wl))) {
if (!woken_up) {
ret = wl1271_ps_elp_wakeup(wl);
if (ret < 0)
goto out_ack;
woken_up = true;
}
ret = wl1271_prepare_tx_frame(wl, skb, buf_offset);
if (ret == -EAGAIN) {
/*
* Aggregation buffer is full.
* Flush buffer and try again.
*/
wl1271_skb_queue_head(wl, skb);
wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
buf_offset, true);
sent_packets = true;
buf_offset = 0;
continue;
} else if (ret == -EBUSY) {
/*
* Firmware buffer is full.
* Queue back last skb, and stop aggregating.
*/
wl1271_skb_queue_head(wl, skb);
/* No work left, avoid scheduling redundant tx work */
set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
goto out_ack;
} else if (ret < 0) {
dev_kfree_skb(skb);
goto out_ack;
}
buf_offset += ret;
wl->tx_packets_count++;
}
out_ack:
if (buf_offset) {
wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
buf_offset, true);
sent_packets = true;
}
if (sent_packets) {
/*
* Interrupt the firmware with the new packets. This is only
* required for older hardware revisions
*/
if (wl->quirks & WL12XX_QUIRK_END_OF_TRANSACTION)
wl1271_write32(wl, WL1271_HOST_WR_ACCESS,
wl->tx_packets_count);
wl1271_handle_tx_low_watermark(wl);
}
out:
if (woken_up)
wl1271_ps_elp_sleep(wl);
}
void wl1271_tx_work(struct work_struct *work)
{
struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
mutex_lock(&wl->mutex);
wl1271_tx_work_locked(wl);
mutex_unlock(&wl->mutex);
}
static void wl1271_tx_complete_packet(struct wl1271 *wl,
struct wl1271_tx_hw_res_descr *result)
{
struct ieee80211_tx_info *info;
struct sk_buff *skb;
int id = result->id;
int rate = -1;
u8 retries = 0;
/* check for id legality */
if (unlikely(id >= ACX_TX_DESCRIPTORS || wl->tx_frames[id] == NULL)) {
wl1271_warning("TX result illegal id: %d", id);
return;
}
skb = wl->tx_frames[id];
info = IEEE80211_SKB_CB(skb);
/* update the TX status info */
if (result->status == TX_SUCCESS) {
if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
info->flags |= IEEE80211_TX_STAT_ACK;
rate = wl1271_rate_to_idx(result->rate_class_index, wl->band);
retries = result->ack_failures;
} else if (result->status == TX_RETRY_EXCEEDED) {
wl->stats.excessive_retries++;
retries = result->ack_failures;
}
info->status.rates[0].idx = rate;
info->status.rates[0].count = retries;
info->status.rates[0].flags = 0;
info->status.ack_signal = -1;
wl->stats.retry_count += result->ack_failures;
/* update security sequence number */
wl->tx_security_seq += (result->lsb_security_sequence_number -
wl->tx_security_last_seq);
wl->tx_security_last_seq = result->lsb_security_sequence_number;
/* remove private header from packet */
skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
/* remove TKIP header space if present */
if (info->control.hw_key &&
info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
memmove(skb->data + WL1271_TKIP_IV_SPACE, skb->data, hdrlen);
skb_pull(skb, WL1271_TKIP_IV_SPACE);
}
wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
" status 0x%x",
result->id, skb, result->ack_failures,
result->rate_class_index, result->status);
/* return the packet to the stack */
skb_queue_tail(&wl->deferred_tx_queue, skb);
ieee80211_queue_work(wl->hw, &wl->netstack_work);
wl1271_free_tx_id(wl, result->id);
}
/* Called upon reception of a TX complete interrupt */
void wl1271_tx_complete(struct wl1271 *wl)
{
struct wl1271_acx_mem_map *memmap =
(struct wl1271_acx_mem_map *)wl->target_mem_map;
u32 count, fw_counter;
u32 i;
/* read the tx results from the chipset */
wl1271_read(wl, le32_to_cpu(memmap->tx_result),
wl->tx_res_if, sizeof(*wl->tx_res_if), false);
fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
/* write host counter to chipset (to ack) */
wl1271_write32(wl, le32_to_cpu(memmap->tx_result) +
offsetof(struct wl1271_tx_hw_res_if,
tx_result_host_counter), fw_counter);
count = fw_counter - wl->tx_results_count;
wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
/* verify that the result buffer is not getting overrun */
if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
wl1271_warning("TX result overflow from chipset: %d", count);
/* process the results */
for (i = 0; i < count; i++) {
struct wl1271_tx_hw_res_descr *result;
u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
/* process the packet */
result = &(wl->tx_res_if->tx_results_queue[offset]);
wl1271_tx_complete_packet(wl, result);
wl->tx_results_count++;
}
}
void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
{
struct sk_buff *skb;
int i, total = 0;
unsigned long flags;
struct ieee80211_tx_info *info;
for (i = 0; i < NUM_TX_QUEUES; i++) {
while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
info = IEEE80211_SKB_CB(skb);
info->status.rates[0].idx = -1;
info->status.rates[0].count = 0;
ieee80211_tx_status(wl->hw, skb);
total++;
}
}
spin_lock_irqsave(&wl->wl_lock, flags);
wl->tx_queue_count -= total;
spin_unlock_irqrestore(&wl->wl_lock, flags);
wl1271_handle_tx_low_watermark(wl);
}
/* caller must hold wl->mutex */
void wl1271_tx_reset(struct wl1271 *wl)
{
int i;
struct sk_buff *skb;
struct ieee80211_tx_info *info;
/* TX failure */
if (wl->bss_type == BSS_TYPE_AP_BSS) {
for (i = 0; i < AP_MAX_LINKS; i++) {
wl1271_tx_reset_link_queues(wl, i);
wl->links[i].allocated_blks = 0;
wl->links[i].prev_freed_blks = 0;
}
wl->last_tx_hlid = 0;
} else {
for (i = 0; i < NUM_TX_QUEUES; i++) {
while ((skb = skb_dequeue(&wl->tx_queue[i]))) {
wl1271_debug(DEBUG_TX, "freeing skb 0x%p",
skb);
info = IEEE80211_SKB_CB(skb);
info->status.rates[0].idx = -1;
info->status.rates[0].count = 0;
ieee80211_tx_status(wl->hw, skb);
}
}
}
wl->tx_queue_count = 0;
/*
* Make sure the driver is at a consistent state, in case this
* function is called from a context other than interface removal.
*/
wl1271_handle_tx_low_watermark(wl);
for (i = 0; i < ACX_TX_DESCRIPTORS; i++) {
if (wl->tx_frames[i] == NULL)
continue;
skb = wl->tx_frames[i];
wl1271_free_tx_id(wl, i);
wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
/* Remove private headers before passing the skb to mac80211 */
info = IEEE80211_SKB_CB(skb);
skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
if (info->control.hw_key &&
info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
memmove(skb->data + WL1271_TKIP_IV_SPACE, skb->data,
hdrlen);
skb_pull(skb, WL1271_TKIP_IV_SPACE);
}
info->status.rates[0].idx = -1;
info->status.rates[0].count = 0;
ieee80211_tx_status(wl->hw, skb);
}
}
#define WL1271_TX_FLUSH_TIMEOUT 500000
/* caller must *NOT* hold wl->mutex */
void wl1271_tx_flush(struct wl1271 *wl)
{
unsigned long timeout;
timeout = jiffies + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
while (!time_after(jiffies, timeout)) {
mutex_lock(&wl->mutex);
wl1271_debug(DEBUG_TX, "flushing tx buffer: %d %d",
wl->tx_frames_cnt, wl->tx_queue_count);
if ((wl->tx_frames_cnt == 0) && (wl->tx_queue_count == 0)) {
mutex_unlock(&wl->mutex);
return;
}
mutex_unlock(&wl->mutex);
msleep(1);
}
wl1271_warning("Unable to flush all TX buffers, timed out.");
}
u32 wl1271_tx_min_rate_get(struct wl1271 *wl)
{
int i;
u32 rate = 0;
if (!wl->basic_rate_set) {
WARN_ON(1);
wl->basic_rate_set = wl->conf.tx.basic_rate;
}
for (i = 0; !rate; i++) {
if ((wl->basic_rate_set >> i) & 0x1)
rate = 1 << i;
}
return rate;
}
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