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path: root/drivers/net/wireless/wl12xx/tx.c
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Diffstat (limited to 'drivers/net/wireless/wl12xx/tx.c')
-rw-r--r--drivers/net/wireless/wl12xx/tx.c523
1 files changed, 523 insertions, 0 deletions
diff --git a/drivers/net/wireless/wl12xx/tx.c b/drivers/net/wireless/wl12xx/tx.c
new file mode 100644
index 00000000000..b44c75cd8c1
--- /dev/null
+++ b/drivers/net/wireless/wl12xx/tx.c
@@ -0,0 +1,523 @@
+/*
+ * 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 "wl12xx.h"
+#include "io.h"
+#include "reg.h"
+#include "ps.h"
+#include "tx.h"
+
+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 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 -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;
+
+ 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)
+{
+ 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;
+ }
+
+#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;
+}
+
+static void 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_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 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));
+
+ 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 sta_rates = 0;
+ u32 buf_offset = 0;
+ bool sent_packets = false;
+ 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);
+ }
+
+ if (unlikely(wl->state == WL1271_STATE_OFF))
+ goto out;
+
+ /* if rates have changed, re-configure the rate policy */
+ if (unlikely(sta_rates)) {
+ ret = wl1271_ps_elp_wakeup(wl, false);
+ if (ret < 0)
+ goto out;
+ woken_up = true;
+
+ wl->rate_set = wl1271_tx_enabled_rates_get(wl, sta_rates);
+ wl1271_acx_rate_policies(wl);
+ }
+
+ while ((skb = wl1271_skb_dequeue(wl))) {
+ 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 == -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 */
+ wl1271_write32(wl, WL1271_HOST_WR_ACCESS, wl->tx_packets_count);
+ 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 */
+ ieee80211_tx_status(wl->hw, skb);
+ 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++;
+ }
+}
+
+/* caller must hold wl->mutex */
+void wl1271_tx_reset(struct wl1271 *wl)
+{
+ int i;
+ struct sk_buff *skb;
+
+ /* TX failure */
+ 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);
+ 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.
+ */
+ handle_tx_low_watermark(wl);
+
+ for (i = 0; i < ACX_TX_DESCRIPTORS; i++)
+ if (wl->tx_frames[i] != NULL) {
+ skb = wl->tx_frames[i];
+ wl1271_free_tx_id(wl, i);
+ wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
+ 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",
+ wl->tx_frames_cnt);
+ 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.");
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-01 02:17:30 +0000