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path: root/drivers/net/wireless/wl12xx/wl1271_tx.c
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Diffstat (limited to 'drivers/net/wireless/wl12xx/wl1271_tx.c')
-rw-r--r--drivers/net/wireless/wl12xx/wl1271_tx.c437
1 files changed, 0 insertions, 437 deletions
diff --git a/drivers/net/wireless/wl12xx/wl1271_tx.c b/drivers/net/wireless/wl12xx/wl1271_tx.c
deleted file mode 100644
index e3dc13c4d01a..000000000000
--- a/drivers/net/wireless/wl12xx/wl1271_tx.c
+++ /dev/null
@@ -1,437 +0,0 @@
-/*
- * 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 "wl1271.h"
-#include "wl1271_io.h"
-#include "wl1271_reg.h"
-#include "wl1271_ps.h"
-#include "wl1271_tx.h"
-
-static int wl1271_tx_id(struct wl1271 *wl, struct sk_buff *skb)
-{
- int i;
- for (i = 0; i < ACX_TX_DESCRIPTORS; i++)
- if (wl->tx_frames[i] == NULL) {
- wl->tx_frames[i] = skb;
- wl->tx_frames_cnt++;
- return i;
- }
-
- return -EBUSY;
-}
-
-static int wl1271_tx_allocate(struct wl1271 *wl, struct sk_buff *skb, u32 extra,
- u32 buf_offset)
-{
- 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 -EBUSY;
-
- /* allocate free identifier for the packet */
- id = wl1271_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;
-
- ret = 0;
-
- wl1271_debug(DEBUG_TX,
- "tx_allocate: size: %d, blocks: %d, id: %d",
- total_len, total_blocks, id);
- } else {
- wl->tx_frames[id] = NULL;
- wl->tx_frames_cnt--;
- }
-
- return ret;
-}
-
-static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct sk_buff *skb,
- u32 extra, struct ieee80211_tx_info *control)
-{
- struct timespec ts;
- struct wl1271_tx_hw_descr *desc;
- int pad, ac;
- 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);
- desc->life_time = cpu_to_le16(TX_HW_MGMT_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;
-
- desc->aid = TX_HW_DEFAULT_AID;
- desc->reserved = 0;
-
- /* align the length (and store in terms of words) */
- pad = WL1271_TX_ALIGN(skb->len);
- 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;
-
- /* 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)
- tx_attr |= ACX_TX_AP_FULL_RATE << TX_HW_ATTR_OFST_RATE_POLICY;
-
- desc->tx_attr = cpu_to_le16(tx_attr);
-
- wl1271_debug(DEBUG_TX, "tx_fill_hdr: pad: %d", pad);
-}
-
-/* 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;
- u8 idx;
- u32 total_len;
-
- 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) {
- idx = info->control.hw_key->hw_key_idx;
-
- /* FIXME: do we have to do this if we're not using WEP? */
- if (unlikely(wl->default_key != idx)) {
- ret = wl1271_cmd_set_default_wep_key(wl, idx);
- if (ret < 0)
- return ret;
- wl->default_key = idx;
- }
- }
-
- ret = wl1271_tx_allocate(wl, skb, extra, buf_offset);
- if (ret < 0)
- return ret;
-
- wl1271_tx_fill_hdr(wl, skb, extra, info);
-
- /*
- * 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 = WL1271_TX_ALIGN(skb->len);
- 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;
- }
-
- return enabled_rates;
-}
-
-void wl1271_tx_work(struct work_struct *work)
-{
- struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
- struct sk_buff *skb;
- bool woken_up = false;
- u32 sta_rates = 0;
- u32 buf_offset;
- int ret;
-
- /* check if the rates supported by the AP have changed */
- if (unlikely(test_and_clear_bit(WL1271_FLAG_STA_RATES_CHANGED,
- &wl->flags))) {
- unsigned long flags;
- spin_lock_irqsave(&wl->wl_lock, flags);
- sta_rates = wl->sta_rate_set;
- spin_unlock_irqrestore(&wl->wl_lock, flags);
- }
-
- mutex_lock(&wl->mutex);
-
- if (unlikely(wl->state == WL1271_STATE_OFF))
- goto out;
-
- /* if rates have changed, re-configure the rate policy */
- if (unlikely(sta_rates)) {
- wl->rate_set = wl1271_tx_enabled_rates_get(wl, sta_rates);
- wl1271_acx_rate_policies(wl);
- }
-
- /* Prepare the transfer buffer, by aggregating all
- * available packets */
- buf_offset = 0;
- while ((skb = skb_dequeue(&wl->tx_queue))) {
- if (!woken_up) {
- ret = wl1271_ps_elp_wakeup(wl, false);
- if (ret < 0)
- goto out_ack;
- woken_up = true;
- }
-
- ret = wl1271_prepare_tx_frame(wl, skb, buf_offset);
- if (ret == -EBUSY) {
- /*
- * Either the firmware buffer is full, or the
- * aggregation buffer is.
- * Queue back last skb, and stop aggregating.
- */
- skb_queue_head(&wl->tx_queue, skb);
- 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);
- /* interrupt the firmware with the new packets */
- wl1271_write32(wl, WL1271_HOST_WR_ACCESS, wl->tx_packets_count);
- }
-
-out:
- if (woken_up)
- wl1271_ps_elp_sleep(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(wl, result->rate_class_index);
- 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 */
- ieee80211_tx_status(wl->hw, skb);
- wl->tx_frames[result->id] = NULL;
- wl->tx_frames_cnt--;
-}
-
-/* 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++;
- }
-
- if (test_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags) &&
- skb_queue_len(&wl->tx_queue) <= WL1271_TX_QUEUE_LOW_WATERMARK) {
- unsigned long flags;
-
- /* firmware buffer has space, restart queues */
- wl1271_debug(DEBUG_TX, "tx_complete: waking 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);
- ieee80211_queue_work(wl->hw, &wl->tx_work);
- }
-}
-
-/* caller must hold wl->mutex */
-void wl1271_tx_reset(struct wl1271 *wl)
-{
- int i;
- struct sk_buff *skb;
-
- /* TX failure */
- while ((skb = skb_dequeue(&wl->tx_queue))) {
- wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
- ieee80211_tx_status(wl->hw, skb);
- }
-
- for (i = 0; i < ACX_TX_DESCRIPTORS; i++)
- if (wl->tx_frames[i] != NULL) {
- skb = wl->tx_frames[i];
- wl->tx_frames[i] = NULL;
- wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
- ieee80211_tx_status(wl->hw, skb);
- }
- wl->tx_frames_cnt = 0;
-}
-
-#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",
- wl->tx_frames_cnt);
- if ((wl->tx_frames_cnt == 0) &&
- skb_queue_empty(&wl->tx_queue)) {
- mutex_unlock(&wl->mutex);
- return;
- }
- mutex_unlock(&wl->mutex);
- msleep(1);
- }
-
- wl1271_warning("Unable to flush all TX buffers, timed out.");
-}
generated by cgit v1.2.3 (git 2.0.4) at 2024-06-04 00:33:55 +0000