| /* |
| * 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) && |
| skb_queue_len(&wl->tx_queue) <= 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); |
| } |
| } |
| |
| 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 = 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 == -EAGAIN) { |
| /* |
| * Aggregation buffer is full. |
| * Flush buffer and try again. |
| */ |
| skb_queue_head(&wl->tx_queue, 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. |
| */ |
| skb_queue_head(&wl->tx_queue, 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 */ |
| while ((skb = skb_dequeue(&wl->tx_queue))) { |
| wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb); |
| ieee80211_tx_status(wl->hw, skb); |
| } |
| |
| /* |
| * 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) && |
| 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."); |
| } |