| /* |
| * Atheros CARL9170 driver |
| * |
| * 802.11 xmit & status routines |
| * |
| * Copyright 2008, Johannes Berg <johannes@sipsolutions.net> |
| * Copyright 2009, 2010, Christian Lamparter <chunkeey@googlemail.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * 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; see the file COPYING. If not, see |
| * http://www.gnu.org/licenses/. |
| * |
| * This file incorporates work covered by the following copyright and |
| * permission notice: |
| * Copyright (c) 2007-2008 Atheros Communications, Inc. |
| * |
| * Permission to use, copy, modify, and/or distribute this software for any |
| * purpose with or without fee is hereby granted, provided that the above |
| * copyright notice and this permission notice appear in all copies. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| */ |
| |
| #include <linux/slab.h> |
| #include <linux/module.h> |
| #include <linux/etherdevice.h> |
| #include <net/mac80211.h> |
| #include "carl9170.h" |
| #include "hw.h" |
| #include "cmd.h" |
| |
| static inline unsigned int __carl9170_get_queue(struct ar9170 *ar, |
| unsigned int queue) |
| { |
| if (unlikely(modparam_noht)) { |
| return queue; |
| } else { |
| /* |
| * This is just another workaround, until |
| * someone figures out how to get QoS and |
| * AMPDU to play nicely together. |
| */ |
| |
| return 2; /* AC_BE */ |
| } |
| } |
| |
| static inline unsigned int carl9170_get_queue(struct ar9170 *ar, |
| struct sk_buff *skb) |
| { |
| return __carl9170_get_queue(ar, skb_get_queue_mapping(skb)); |
| } |
| |
| static bool is_mem_full(struct ar9170 *ar) |
| { |
| return (DIV_ROUND_UP(IEEE80211_MAX_FRAME_LEN, ar->fw.mem_block_size) > |
| atomic_read(&ar->mem_free_blocks)); |
| } |
| |
| static void carl9170_tx_accounting(struct ar9170 *ar, struct sk_buff *skb) |
| { |
| int queue, i; |
| bool mem_full; |
| |
| atomic_inc(&ar->tx_total_queued); |
| |
| queue = skb_get_queue_mapping(skb); |
| spin_lock_bh(&ar->tx_stats_lock); |
| |
| /* |
| * The driver has to accept the frame, regardless if the queue is |
| * full to the brim, or not. We have to do the queuing internally, |
| * since mac80211 assumes that a driver which can operate with |
| * aggregated frames does not reject frames for this reason. |
| */ |
| ar->tx_stats[queue].len++; |
| ar->tx_stats[queue].count++; |
| |
| mem_full = is_mem_full(ar); |
| for (i = 0; i < ar->hw->queues; i++) { |
| if (mem_full || ar->tx_stats[i].len >= ar->tx_stats[i].limit) { |
| ieee80211_stop_queue(ar->hw, i); |
| ar->queue_stop_timeout[i] = jiffies; |
| } |
| } |
| |
| spin_unlock_bh(&ar->tx_stats_lock); |
| } |
| |
| /* needs rcu_read_lock */ |
| static struct ieee80211_sta *__carl9170_get_tx_sta(struct ar9170 *ar, |
| struct sk_buff *skb) |
| { |
| struct _carl9170_tx_superframe *super = (void *) skb->data; |
| struct ieee80211_hdr *hdr = (void *) super->frame_data; |
| struct ieee80211_vif *vif; |
| unsigned int vif_id; |
| |
| vif_id = (super->s.misc & CARL9170_TX_SUPER_MISC_VIF_ID) >> |
| CARL9170_TX_SUPER_MISC_VIF_ID_S; |
| |
| if (WARN_ON_ONCE(vif_id >= AR9170_MAX_VIRTUAL_MAC)) |
| return NULL; |
| |
| vif = rcu_dereference(ar->vif_priv[vif_id].vif); |
| if (unlikely(!vif)) |
| return NULL; |
| |
| /* |
| * Normally we should use wrappers like ieee80211_get_DA to get |
| * the correct peer ieee80211_sta. |
| * |
| * But there is a problem with indirect traffic (broadcasts, or |
| * data which is designated for other stations) in station mode. |
| * The frame will be directed to the AP for distribution and not |
| * to the actual destination. |
| */ |
| |
| return ieee80211_find_sta(vif, hdr->addr1); |
| } |
| |
| static void carl9170_tx_ps_unblock(struct ar9170 *ar, struct sk_buff *skb) |
| { |
| struct ieee80211_sta *sta; |
| struct carl9170_sta_info *sta_info; |
| |
| rcu_read_lock(); |
| sta = __carl9170_get_tx_sta(ar, skb); |
| if (unlikely(!sta)) |
| goto out_rcu; |
| |
| sta_info = (struct carl9170_sta_info *) sta->drv_priv; |
| if (atomic_dec_return(&sta_info->pending_frames) == 0) |
| ieee80211_sta_block_awake(ar->hw, sta, false); |
| |
| out_rcu: |
| rcu_read_unlock(); |
| } |
| |
| static void carl9170_tx_accounting_free(struct ar9170 *ar, struct sk_buff *skb) |
| { |
| int queue; |
| |
| queue = skb_get_queue_mapping(skb); |
| |
| spin_lock_bh(&ar->tx_stats_lock); |
| |
| ar->tx_stats[queue].len--; |
| |
| if (!is_mem_full(ar)) { |
| unsigned int i; |
| for (i = 0; i < ar->hw->queues; i++) { |
| if (ar->tx_stats[i].len >= CARL9170_NUM_TX_LIMIT_SOFT) |
| continue; |
| |
| if (ieee80211_queue_stopped(ar->hw, i)) { |
| unsigned long tmp; |
| |
| tmp = jiffies - ar->queue_stop_timeout[i]; |
| if (tmp > ar->max_queue_stop_timeout[i]) |
| ar->max_queue_stop_timeout[i] = tmp; |
| } |
| |
| ieee80211_wake_queue(ar->hw, i); |
| } |
| } |
| |
| spin_unlock_bh(&ar->tx_stats_lock); |
| |
| if (atomic_dec_and_test(&ar->tx_total_queued)) |
| complete(&ar->tx_flush); |
| } |
| |
| static int carl9170_alloc_dev_space(struct ar9170 *ar, struct sk_buff *skb) |
| { |
| struct _carl9170_tx_superframe *super = (void *) skb->data; |
| unsigned int chunks; |
| int cookie = -1; |
| |
| atomic_inc(&ar->mem_allocs); |
| |
| chunks = DIV_ROUND_UP(skb->len, ar->fw.mem_block_size); |
| if (unlikely(atomic_sub_return(chunks, &ar->mem_free_blocks) < 0)) { |
| atomic_add(chunks, &ar->mem_free_blocks); |
| return -ENOSPC; |
| } |
| |
| spin_lock_bh(&ar->mem_lock); |
| cookie = bitmap_find_free_region(ar->mem_bitmap, ar->fw.mem_blocks, 0); |
| spin_unlock_bh(&ar->mem_lock); |
| |
| if (unlikely(cookie < 0)) { |
| atomic_add(chunks, &ar->mem_free_blocks); |
| return -ENOSPC; |
| } |
| |
| super = (void *) skb->data; |
| |
| /* |
| * Cookie #0 serves two special purposes: |
| * 1. The firmware might use it generate BlockACK frames |
| * in responds of an incoming BlockAckReqs. |
| * |
| * 2. Prevent double-free bugs. |
| */ |
| super->s.cookie = (u8) cookie + 1; |
| return 0; |
| } |
| |
| static void carl9170_release_dev_space(struct ar9170 *ar, struct sk_buff *skb) |
| { |
| struct _carl9170_tx_superframe *super = (void *) skb->data; |
| int cookie; |
| |
| /* make a local copy of the cookie */ |
| cookie = super->s.cookie; |
| /* invalidate cookie */ |
| super->s.cookie = 0; |
| |
| /* |
| * Do a out-of-bounds check on the cookie: |
| * |
| * * cookie "0" is reserved and won't be assigned to any |
| * out-going frame. Internally however, it is used to |
| * mark no longer/un-accounted frames and serves as a |
| * cheap way of preventing frames from being freed |
| * twice by _accident_. NB: There is a tiny race... |
| * |
| * * obviously, cookie number is limited by the amount |
| * of available memory blocks, so the number can |
| * never execeed the mem_blocks count. |
| */ |
| if (unlikely(WARN_ON_ONCE(cookie == 0) || |
| WARN_ON_ONCE(cookie > ar->fw.mem_blocks))) |
| return; |
| |
| atomic_add(DIV_ROUND_UP(skb->len, ar->fw.mem_block_size), |
| &ar->mem_free_blocks); |
| |
| spin_lock_bh(&ar->mem_lock); |
| bitmap_release_region(ar->mem_bitmap, cookie - 1, 0); |
| spin_unlock_bh(&ar->mem_lock); |
| } |
| |
| /* Called from any context */ |
| static void carl9170_tx_release(struct kref *ref) |
| { |
| struct ar9170 *ar; |
| struct carl9170_tx_info *arinfo; |
| struct ieee80211_tx_info *txinfo; |
| struct sk_buff *skb; |
| |
| arinfo = container_of(ref, struct carl9170_tx_info, ref); |
| txinfo = container_of((void *) arinfo, struct ieee80211_tx_info, |
| rate_driver_data); |
| skb = container_of((void *) txinfo, struct sk_buff, cb); |
| |
| ar = arinfo->ar; |
| if (WARN_ON_ONCE(!ar)) |
| return; |
| |
| BUILD_BUG_ON( |
| offsetof(struct ieee80211_tx_info, status.ack_signal) != 20); |
| |
| memset(&txinfo->status.ack_signal, 0, |
| sizeof(struct ieee80211_tx_info) - |
| offsetof(struct ieee80211_tx_info, status.ack_signal)); |
| |
| if (atomic_read(&ar->tx_total_queued)) |
| ar->tx_schedule = true; |
| |
| if (txinfo->flags & IEEE80211_TX_CTL_AMPDU) { |
| if (!atomic_read(&ar->tx_ampdu_upload)) |
| ar->tx_ampdu_schedule = true; |
| |
| if (txinfo->flags & IEEE80211_TX_STAT_AMPDU) { |
| struct _carl9170_tx_superframe *super; |
| |
| super = (void *)skb->data; |
| txinfo->status.ampdu_len = super->s.rix; |
| txinfo->status.ampdu_ack_len = super->s.cnt; |
| } else if ((txinfo->flags & IEEE80211_TX_STAT_ACK) && |
| !(txinfo->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)) { |
| /* |
| * drop redundant tx_status reports: |
| * |
| * 1. ampdu_ack_len of the final tx_status does |
| * include the feedback of this particular frame. |
| * |
| * 2. tx_status_irqsafe only queues up to 128 |
| * tx feedback reports and discards the rest. |
| * |
| * 3. minstrel_ht is picky, it only accepts |
| * reports of frames with the TX_STATUS_AMPDU flag. |
| * |
| * 4. mac80211 is not particularly interested in |
| * feedback either [CTL_REQ_TX_STATUS not set] |
| */ |
| |
| ieee80211_free_txskb(ar->hw, skb); |
| return; |
| } else { |
| /* |
| * Either the frame transmission has failed or |
| * mac80211 requested tx status. |
| */ |
| } |
| } |
| |
| skb_pull(skb, sizeof(struct _carl9170_tx_superframe)); |
| ieee80211_tx_status_irqsafe(ar->hw, skb); |
| } |
| |
| void carl9170_tx_get_skb(struct sk_buff *skb) |
| { |
| struct carl9170_tx_info *arinfo = (void *) |
| (IEEE80211_SKB_CB(skb))->rate_driver_data; |
| kref_get(&arinfo->ref); |
| } |
| |
| int carl9170_tx_put_skb(struct sk_buff *skb) |
| { |
| struct carl9170_tx_info *arinfo = (void *) |
| (IEEE80211_SKB_CB(skb))->rate_driver_data; |
| |
| return kref_put(&arinfo->ref, carl9170_tx_release); |
| } |
| |
| /* Caller must hold the tid_info->lock & rcu_read_lock */ |
| static void carl9170_tx_shift_bm(struct ar9170 *ar, |
| struct carl9170_sta_tid *tid_info, u16 seq) |
| { |
| u16 off; |
| |
| off = SEQ_DIFF(seq, tid_info->bsn); |
| |
| if (WARN_ON_ONCE(off >= CARL9170_BAW_BITS)) |
| return; |
| |
| /* |
| * Sanity check. For each MPDU we set the bit in bitmap and |
| * clear it once we received the tx_status. |
| * But if the bit is already cleared then we've been bitten |
| * by a bug. |
| */ |
| WARN_ON_ONCE(!test_and_clear_bit(off, tid_info->bitmap)); |
| |
| off = SEQ_DIFF(tid_info->snx, tid_info->bsn); |
| if (WARN_ON_ONCE(off >= CARL9170_BAW_BITS)) |
| return; |
| |
| if (!bitmap_empty(tid_info->bitmap, off)) |
| off = find_first_bit(tid_info->bitmap, off); |
| |
| tid_info->bsn += off; |
| tid_info->bsn &= 0x0fff; |
| |
| bitmap_shift_right(tid_info->bitmap, tid_info->bitmap, |
| off, CARL9170_BAW_BITS); |
| } |
| |
| static void carl9170_tx_status_process_ampdu(struct ar9170 *ar, |
| struct sk_buff *skb, struct ieee80211_tx_info *txinfo) |
| { |
| struct _carl9170_tx_superframe *super = (void *) skb->data; |
| struct ieee80211_hdr *hdr = (void *) super->frame_data; |
| struct ieee80211_sta *sta; |
| struct carl9170_sta_info *sta_info; |
| struct carl9170_sta_tid *tid_info; |
| u8 tid; |
| |
| if (!(txinfo->flags & IEEE80211_TX_CTL_AMPDU) || |
| txinfo->flags & IEEE80211_TX_CTL_INJECTED) |
| return; |
| |
| rcu_read_lock(); |
| sta = __carl9170_get_tx_sta(ar, skb); |
| if (unlikely(!sta)) |
| goto out_rcu; |
| |
| tid = get_tid_h(hdr); |
| |
| sta_info = (void *) sta->drv_priv; |
| tid_info = rcu_dereference(sta_info->agg[tid]); |
| if (!tid_info) |
| goto out_rcu; |
| |
| spin_lock_bh(&tid_info->lock); |
| if (likely(tid_info->state >= CARL9170_TID_STATE_IDLE)) |
| carl9170_tx_shift_bm(ar, tid_info, get_seq_h(hdr)); |
| |
| if (sta_info->stats[tid].clear) { |
| sta_info->stats[tid].clear = false; |
| sta_info->stats[tid].req = false; |
| sta_info->stats[tid].ampdu_len = 0; |
| sta_info->stats[tid].ampdu_ack_len = 0; |
| } |
| |
| sta_info->stats[tid].ampdu_len++; |
| if (txinfo->status.rates[0].count == 1) |
| sta_info->stats[tid].ampdu_ack_len++; |
| |
| if (!(txinfo->flags & IEEE80211_TX_STAT_ACK)) |
| sta_info->stats[tid].req = true; |
| |
| if (super->f.mac_control & cpu_to_le16(AR9170_TX_MAC_IMM_BA)) { |
| super->s.rix = sta_info->stats[tid].ampdu_len; |
| super->s.cnt = sta_info->stats[tid].ampdu_ack_len; |
| txinfo->flags |= IEEE80211_TX_STAT_AMPDU; |
| if (sta_info->stats[tid].req) |
| txinfo->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK; |
| |
| sta_info->stats[tid].clear = true; |
| } |
| spin_unlock_bh(&tid_info->lock); |
| |
| out_rcu: |
| rcu_read_unlock(); |
| } |
| |
| static void carl9170_tx_bar_status(struct ar9170 *ar, struct sk_buff *skb, |
| struct ieee80211_tx_info *tx_info) |
| { |
| struct _carl9170_tx_superframe *super = (void *) skb->data; |
| struct ieee80211_bar *bar = (void *) super->frame_data; |
| |
| /* |
| * Unlike all other frames, the status report for BARs does |
| * not directly come from the hardware as it is incapable of |
| * matching a BA to a previously send BAR. |
| * Instead the RX-path will scan for incoming BAs and set the |
| * IEEE80211_TX_STAT_ACK if it sees one that was likely |
| * caused by a BAR from us. |
| */ |
| |
| if (unlikely(ieee80211_is_back_req(bar->frame_control)) && |
| !(tx_info->flags & IEEE80211_TX_STAT_ACK)) { |
| struct carl9170_bar_list_entry *entry; |
| int queue = skb_get_queue_mapping(skb); |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(entry, &ar->bar_list[queue], list) { |
| if (entry->skb == skb) { |
| spin_lock_bh(&ar->bar_list_lock[queue]); |
| list_del_rcu(&entry->list); |
| spin_unlock_bh(&ar->bar_list_lock[queue]); |
| kfree_rcu(entry, head); |
| goto out; |
| } |
| } |
| |
| WARN(1, "bar not found in %d - ra:%pM ta:%pM c:%x ssn:%x\n", |
| queue, bar->ra, bar->ta, bar->control, |
| bar->start_seq_num); |
| out: |
| rcu_read_unlock(); |
| } |
| } |
| |
| void carl9170_tx_status(struct ar9170 *ar, struct sk_buff *skb, |
| const bool success) |
| { |
| struct ieee80211_tx_info *txinfo; |
| |
| carl9170_tx_accounting_free(ar, skb); |
| |
| txinfo = IEEE80211_SKB_CB(skb); |
| |
| carl9170_tx_bar_status(ar, skb, txinfo); |
| |
| if (success) |
| txinfo->flags |= IEEE80211_TX_STAT_ACK; |
| else |
| ar->tx_ack_failures++; |
| |
| if (txinfo->flags & IEEE80211_TX_CTL_AMPDU) |
| carl9170_tx_status_process_ampdu(ar, skb, txinfo); |
| |
| carl9170_tx_ps_unblock(ar, skb); |
| carl9170_tx_put_skb(skb); |
| } |
| |
| /* This function may be called form any context */ |
| void carl9170_tx_callback(struct ar9170 *ar, struct sk_buff *skb) |
| { |
| struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb); |
| |
| atomic_dec(&ar->tx_total_pending); |
| |
| if (txinfo->flags & IEEE80211_TX_CTL_AMPDU) |
| atomic_dec(&ar->tx_ampdu_upload); |
| |
| if (carl9170_tx_put_skb(skb)) |
| tasklet_hi_schedule(&ar->usb_tasklet); |
| } |
| |
| static struct sk_buff *carl9170_get_queued_skb(struct ar9170 *ar, u8 cookie, |
| struct sk_buff_head *queue) |
| { |
| struct sk_buff *skb; |
| |
| spin_lock_bh(&queue->lock); |
| skb_queue_walk(queue, skb) { |
| struct _carl9170_tx_superframe *txc = (void *) skb->data; |
| |
| if (txc->s.cookie != cookie) |
| continue; |
| |
| __skb_unlink(skb, queue); |
| spin_unlock_bh(&queue->lock); |
| |
| carl9170_release_dev_space(ar, skb); |
| return skb; |
| } |
| spin_unlock_bh(&queue->lock); |
| |
| return NULL; |
| } |
| |
| static void carl9170_tx_fill_rateinfo(struct ar9170 *ar, unsigned int rix, |
| unsigned int tries, struct ieee80211_tx_info *txinfo) |
| { |
| unsigned int i; |
| |
| for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { |
| if (txinfo->status.rates[i].idx < 0) |
| break; |
| |
| if (i == rix) { |
| txinfo->status.rates[i].count = tries; |
| i++; |
| break; |
| } |
| } |
| |
| for (; i < IEEE80211_TX_MAX_RATES; i++) { |
| txinfo->status.rates[i].idx = -1; |
| txinfo->status.rates[i].count = 0; |
| } |
| } |
| |
| static void carl9170_check_queue_stop_timeout(struct ar9170 *ar) |
| { |
| int i; |
| struct sk_buff *skb; |
| struct ieee80211_tx_info *txinfo; |
| struct carl9170_tx_info *arinfo; |
| bool restart = false; |
| |
| for (i = 0; i < ar->hw->queues; i++) { |
| spin_lock_bh(&ar->tx_status[i].lock); |
| |
| skb = skb_peek(&ar->tx_status[i]); |
| |
| if (!skb) |
| goto next; |
| |
| txinfo = IEEE80211_SKB_CB(skb); |
| arinfo = (void *) txinfo->rate_driver_data; |
| |
| if (time_is_before_jiffies(arinfo->timeout + |
| msecs_to_jiffies(CARL9170_QUEUE_STUCK_TIMEOUT)) == true) |
| restart = true; |
| |
| next: |
| spin_unlock_bh(&ar->tx_status[i].lock); |
| } |
| |
| if (restart) { |
| /* |
| * At least one queue has been stuck for long enough. |
| * Give the device a kick and hope it gets back to |
| * work. |
| * |
| * possible reasons may include: |
| * - frames got lost/corrupted (bad connection to the device) |
| * - stalled rx processing/usb controller hiccups |
| * - firmware errors/bugs |
| * - every bug you can think of. |
| * - all bugs you can't... |
| * - ... |
| */ |
| carl9170_restart(ar, CARL9170_RR_STUCK_TX); |
| } |
| } |
| |
| static void carl9170_tx_ampdu_timeout(struct ar9170 *ar) |
| { |
| struct carl9170_sta_tid *iter; |
| struct sk_buff *skb; |
| struct ieee80211_tx_info *txinfo; |
| struct carl9170_tx_info *arinfo; |
| struct ieee80211_sta *sta; |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(iter, &ar->tx_ampdu_list, list) { |
| if (iter->state < CARL9170_TID_STATE_IDLE) |
| continue; |
| |
| spin_lock_bh(&iter->lock); |
| skb = skb_peek(&iter->queue); |
| if (!skb) |
| goto unlock; |
| |
| txinfo = IEEE80211_SKB_CB(skb); |
| arinfo = (void *)txinfo->rate_driver_data; |
| if (time_is_after_jiffies(arinfo->timeout + |
| msecs_to_jiffies(CARL9170_QUEUE_TIMEOUT))) |
| goto unlock; |
| |
| sta = iter->sta; |
| if (WARN_ON(!sta)) |
| goto unlock; |
| |
| ieee80211_stop_tx_ba_session(sta, iter->tid); |
| unlock: |
| spin_unlock_bh(&iter->lock); |
| |
| } |
| rcu_read_unlock(); |
| } |
| |
| void carl9170_tx_janitor(struct work_struct *work) |
| { |
| struct ar9170 *ar = container_of(work, struct ar9170, |
| tx_janitor.work); |
| if (!IS_STARTED(ar)) |
| return; |
| |
| ar->tx_janitor_last_run = jiffies; |
| |
| carl9170_check_queue_stop_timeout(ar); |
| carl9170_tx_ampdu_timeout(ar); |
| |
| if (!atomic_read(&ar->tx_total_queued)) |
| return; |
| |
| ieee80211_queue_delayed_work(ar->hw, &ar->tx_janitor, |
| msecs_to_jiffies(CARL9170_TX_TIMEOUT)); |
| } |
| |
| static void __carl9170_tx_process_status(struct ar9170 *ar, |
| const uint8_t cookie, const uint8_t info) |
| { |
| struct sk_buff *skb; |
| struct ieee80211_tx_info *txinfo; |
| unsigned int r, t, q; |
| bool success = true; |
| |
| q = ar9170_qmap[info & CARL9170_TX_STATUS_QUEUE]; |
| |
| skb = carl9170_get_queued_skb(ar, cookie, &ar->tx_status[q]); |
| if (!skb) { |
| /* |
| * We have lost the race to another thread. |
| */ |
| |
| return ; |
| } |
| |
| txinfo = IEEE80211_SKB_CB(skb); |
| |
| if (!(info & CARL9170_TX_STATUS_SUCCESS)) |
| success = false; |
| |
| r = (info & CARL9170_TX_STATUS_RIX) >> CARL9170_TX_STATUS_RIX_S; |
| t = (info & CARL9170_TX_STATUS_TRIES) >> CARL9170_TX_STATUS_TRIES_S; |
| |
| carl9170_tx_fill_rateinfo(ar, r, t, txinfo); |
| carl9170_tx_status(ar, skb, success); |
| } |
| |
| void carl9170_tx_process_status(struct ar9170 *ar, |
| const struct carl9170_rsp *cmd) |
| { |
| unsigned int i; |
| |
| for (i = 0; i < cmd->hdr.ext; i++) { |
| if (WARN_ON(i > ((cmd->hdr.len / 2) + 1))) { |
| print_hex_dump_bytes("UU:", DUMP_PREFIX_NONE, |
| (void *) cmd, cmd->hdr.len + 4); |
| break; |
| } |
| |
| __carl9170_tx_process_status(ar, cmd->_tx_status[i].cookie, |
| cmd->_tx_status[i].info); |
| } |
| } |
| |
| static void carl9170_tx_rate_tpc_chains(struct ar9170 *ar, |
| struct ieee80211_tx_info *info, struct ieee80211_tx_rate *txrate, |
| unsigned int *phyrate, unsigned int *tpc, unsigned int *chains) |
| { |
| struct ieee80211_rate *rate = NULL; |
| u8 *txpower; |
| unsigned int idx; |
| |
| idx = txrate->idx; |
| *tpc = 0; |
| *phyrate = 0; |
| |
| if (txrate->flags & IEEE80211_TX_RC_MCS) { |
| if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) { |
| /* +1 dBm for HT40 */ |
| *tpc += 2; |
| |
| if (info->band == NL80211_BAND_2GHZ) |
| txpower = ar->power_2G_ht40; |
| else |
| txpower = ar->power_5G_ht40; |
| } else { |
| if (info->band == NL80211_BAND_2GHZ) |
| txpower = ar->power_2G_ht20; |
| else |
| txpower = ar->power_5G_ht20; |
| } |
| |
| *phyrate = txrate->idx; |
| *tpc += txpower[idx & 7]; |
| } else { |
| if (info->band == NL80211_BAND_2GHZ) { |
| if (idx < 4) |
| txpower = ar->power_2G_cck; |
| else |
| txpower = ar->power_2G_ofdm; |
| } else { |
| txpower = ar->power_5G_leg; |
| idx += 4; |
| } |
| |
| rate = &__carl9170_ratetable[idx]; |
| *tpc += txpower[(rate->hw_value & 0x30) >> 4]; |
| *phyrate = rate->hw_value & 0xf; |
| } |
| |
| if (ar->eeprom.tx_mask == 1) { |
| *chains = AR9170_TX_PHY_TXCHAIN_1; |
| } else { |
| if (!(txrate->flags & IEEE80211_TX_RC_MCS) && |
| rate && rate->bitrate >= 360) |
| *chains = AR9170_TX_PHY_TXCHAIN_1; |
| else |
| *chains = AR9170_TX_PHY_TXCHAIN_2; |
| } |
| |
| *tpc = min_t(unsigned int, *tpc, ar->hw->conf.power_level * 2); |
| } |
| |
| static __le32 carl9170_tx_physet(struct ar9170 *ar, |
| struct ieee80211_tx_info *info, struct ieee80211_tx_rate *txrate) |
| { |
| unsigned int power = 0, chains = 0, phyrate = 0; |
| __le32 tmp; |
| |
| tmp = cpu_to_le32(0); |
| |
| if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) |
| tmp |= cpu_to_le32(AR9170_TX_PHY_BW_40MHZ << |
| AR9170_TX_PHY_BW_S); |
| /* this works because 40 MHz is 2 and dup is 3 */ |
| if (txrate->flags & IEEE80211_TX_RC_DUP_DATA) |
| tmp |= cpu_to_le32(AR9170_TX_PHY_BW_40MHZ_DUP << |
| AR9170_TX_PHY_BW_S); |
| |
| if (txrate->flags & IEEE80211_TX_RC_SHORT_GI) |
| tmp |= cpu_to_le32(AR9170_TX_PHY_SHORT_GI); |
| |
| if (txrate->flags & IEEE80211_TX_RC_MCS) { |
| SET_VAL(AR9170_TX_PHY_MCS, phyrate, txrate->idx); |
| |
| /* heavy clip control */ |
| tmp |= cpu_to_le32((txrate->idx & 0x7) << |
| AR9170_TX_PHY_TX_HEAVY_CLIP_S); |
| |
| tmp |= cpu_to_le32(AR9170_TX_PHY_MOD_HT); |
| |
| /* |
| * green field preamble does not work. |
| * |
| * if (txrate->flags & IEEE80211_TX_RC_GREEN_FIELD) |
| * tmp |= cpu_to_le32(AR9170_TX_PHY_GREENFIELD); |
| */ |
| } else { |
| if (info->band == NL80211_BAND_2GHZ) { |
| if (txrate->idx <= AR9170_TX_PHY_RATE_CCK_11M) |
| tmp |= cpu_to_le32(AR9170_TX_PHY_MOD_CCK); |
| else |
| tmp |= cpu_to_le32(AR9170_TX_PHY_MOD_OFDM); |
| } else { |
| tmp |= cpu_to_le32(AR9170_TX_PHY_MOD_OFDM); |
| } |
| |
| /* |
| * short preamble seems to be broken too. |
| * |
| * if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE) |
| * tmp |= cpu_to_le32(AR9170_TX_PHY_SHORT_PREAMBLE); |
| */ |
| } |
| carl9170_tx_rate_tpc_chains(ar, info, txrate, |
| &phyrate, &power, &chains); |
| |
| tmp |= cpu_to_le32(SET_CONSTVAL(AR9170_TX_PHY_MCS, phyrate)); |
| tmp |= cpu_to_le32(SET_CONSTVAL(AR9170_TX_PHY_TX_PWR, power)); |
| tmp |= cpu_to_le32(SET_CONSTVAL(AR9170_TX_PHY_TXCHAIN, chains)); |
| return tmp; |
| } |
| |
| static bool carl9170_tx_rts_check(struct ar9170 *ar, |
| struct ieee80211_tx_rate *rate, |
| bool ampdu, bool multi) |
| { |
| switch (ar->erp_mode) { |
| case CARL9170_ERP_AUTO: |
| if (ampdu) |
| break; |
| |
| case CARL9170_ERP_MAC80211: |
| if (!(rate->flags & IEEE80211_TX_RC_USE_RTS_CTS)) |
| break; |
| |
| case CARL9170_ERP_RTS: |
| if (likely(!multi)) |
| return true; |
| |
| default: |
| break; |
| } |
| |
| return false; |
| } |
| |
| static bool carl9170_tx_cts_check(struct ar9170 *ar, |
| struct ieee80211_tx_rate *rate) |
| { |
| switch (ar->erp_mode) { |
| case CARL9170_ERP_AUTO: |
| case CARL9170_ERP_MAC80211: |
| if (!(rate->flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) |
| break; |
| |
| case CARL9170_ERP_CTS: |
| return true; |
| |
| default: |
| break; |
| } |
| |
| return false; |
| } |
| |
| static void carl9170_tx_get_rates(struct ar9170 *ar, |
| struct ieee80211_vif *vif, |
| struct ieee80211_sta *sta, |
| struct sk_buff *skb) |
| { |
| struct ieee80211_tx_info *info; |
| |
| BUILD_BUG_ON(IEEE80211_TX_MAX_RATES < CARL9170_TX_MAX_RATES); |
| BUILD_BUG_ON(IEEE80211_TX_MAX_RATES > IEEE80211_TX_RATE_TABLE_SIZE); |
| |
| info = IEEE80211_SKB_CB(skb); |
| |
| ieee80211_get_tx_rates(vif, sta, skb, |
| info->control.rates, |
| IEEE80211_TX_MAX_RATES); |
| } |
| |
| static void carl9170_tx_apply_rateset(struct ar9170 *ar, |
| struct ieee80211_tx_info *sinfo, |
| struct sk_buff *skb) |
| { |
| struct ieee80211_tx_rate *txrate; |
| struct ieee80211_tx_info *info; |
| struct _carl9170_tx_superframe *txc = (void *) skb->data; |
| int i; |
| bool ampdu; |
| bool no_ack; |
| |
| info = IEEE80211_SKB_CB(skb); |
| ampdu = !!(info->flags & IEEE80211_TX_CTL_AMPDU); |
| no_ack = !!(info->flags & IEEE80211_TX_CTL_NO_ACK); |
| |
| /* Set the rate control probe flag for all (sub-) frames. |
| * This is because the TX_STATS_AMPDU flag is only set on |
| * the last frame, so it has to be inherited. |
| */ |
| info->flags |= (sinfo->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE); |
| |
| /* NOTE: For the first rate, the ERP & AMPDU flags are directly |
| * taken from mac_control. For all fallback rate, the firmware |
| * updates the mac_control flags from the rate info field. |
| */ |
| for (i = 0; i < CARL9170_TX_MAX_RATES; i++) { |
| __le32 phy_set; |
| |
| txrate = &sinfo->control.rates[i]; |
| if (txrate->idx < 0) |
| break; |
| |
| phy_set = carl9170_tx_physet(ar, info, txrate); |
| if (i == 0) { |
| __le16 mac_tmp = cpu_to_le16(0); |
| |
| /* first rate - part of the hw's frame header */ |
| txc->f.phy_control = phy_set; |
| |
| if (ampdu && txrate->flags & IEEE80211_TX_RC_MCS) |
| mac_tmp |= cpu_to_le16(AR9170_TX_MAC_AGGR); |
| |
| if (carl9170_tx_rts_check(ar, txrate, ampdu, no_ack)) |
| mac_tmp |= cpu_to_le16(AR9170_TX_MAC_PROT_RTS); |
| else if (carl9170_tx_cts_check(ar, txrate)) |
| mac_tmp |= cpu_to_le16(AR9170_TX_MAC_PROT_CTS); |
| |
| txc->f.mac_control |= mac_tmp; |
| } else { |
| /* fallback rates are stored in the firmware's |
| * retry rate set array. |
| */ |
| txc->s.rr[i - 1] = phy_set; |
| } |
| |
| SET_VAL(CARL9170_TX_SUPER_RI_TRIES, txc->s.ri[i], |
| txrate->count); |
| |
| if (carl9170_tx_rts_check(ar, txrate, ampdu, no_ack)) |
| txc->s.ri[i] |= (AR9170_TX_MAC_PROT_RTS << |
| CARL9170_TX_SUPER_RI_ERP_PROT_S); |
| else if (carl9170_tx_cts_check(ar, txrate)) |
| txc->s.ri[i] |= (AR9170_TX_MAC_PROT_CTS << |
| CARL9170_TX_SUPER_RI_ERP_PROT_S); |
| |
| if (ampdu && (txrate->flags & IEEE80211_TX_RC_MCS)) |
| txc->s.ri[i] |= CARL9170_TX_SUPER_RI_AMPDU; |
| } |
| } |
| |
| static int carl9170_tx_prepare(struct ar9170 *ar, |
| struct ieee80211_sta *sta, |
| struct sk_buff *skb) |
| { |
| struct ieee80211_hdr *hdr; |
| struct _carl9170_tx_superframe *txc; |
| struct carl9170_vif_info *cvif; |
| struct ieee80211_tx_info *info; |
| struct carl9170_tx_info *arinfo; |
| unsigned int hw_queue; |
| __le16 mac_tmp; |
| u16 len; |
| |
| BUILD_BUG_ON(sizeof(*arinfo) > sizeof(info->rate_driver_data)); |
| BUILD_BUG_ON(sizeof(struct _carl9170_tx_superdesc) != |
| CARL9170_TX_SUPERDESC_LEN); |
| |
| BUILD_BUG_ON(sizeof(struct _ar9170_tx_hwdesc) != |
| AR9170_TX_HWDESC_LEN); |
| |
| BUILD_BUG_ON(AR9170_MAX_VIRTUAL_MAC > |
| ((CARL9170_TX_SUPER_MISC_VIF_ID >> |
| CARL9170_TX_SUPER_MISC_VIF_ID_S) + 1)); |
| |
| hw_queue = ar9170_qmap[carl9170_get_queue(ar, skb)]; |
| |
| hdr = (void *)skb->data; |
| info = IEEE80211_SKB_CB(skb); |
| len = skb->len; |
| |
| /* |
| * Note: If the frame was sent through a monitor interface, |
| * the ieee80211_vif pointer can be NULL. |
| */ |
| if (likely(info->control.vif)) |
| cvif = (void *) info->control.vif->drv_priv; |
| else |
| cvif = NULL; |
| |
| txc = skb_push(skb, sizeof(*txc)); |
| memset(txc, 0, sizeof(*txc)); |
| |
| SET_VAL(CARL9170_TX_SUPER_MISC_QUEUE, txc->s.misc, hw_queue); |
| |
| if (likely(cvif)) |
| SET_VAL(CARL9170_TX_SUPER_MISC_VIF_ID, txc->s.misc, cvif->id); |
| |
| if (unlikely(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM)) |
| txc->s.misc |= CARL9170_TX_SUPER_MISC_CAB; |
| |
| if (unlikely(info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)) |
| txc->s.misc |= CARL9170_TX_SUPER_MISC_ASSIGN_SEQ; |
| |
| if (unlikely(ieee80211_is_probe_resp(hdr->frame_control))) |
| txc->s.misc |= CARL9170_TX_SUPER_MISC_FILL_IN_TSF; |
| |
| mac_tmp = cpu_to_le16(AR9170_TX_MAC_HW_DURATION | |
| AR9170_TX_MAC_BACKOFF); |
| mac_tmp |= cpu_to_le16((hw_queue << AR9170_TX_MAC_QOS_S) & |
| AR9170_TX_MAC_QOS); |
| |
| if (unlikely(info->flags & IEEE80211_TX_CTL_NO_ACK)) |
| mac_tmp |= cpu_to_le16(AR9170_TX_MAC_NO_ACK); |
| |
| if (info->control.hw_key) { |
| len += info->control.hw_key->icv_len; |
| |
| switch (info->control.hw_key->cipher) { |
| case WLAN_CIPHER_SUITE_WEP40: |
| case WLAN_CIPHER_SUITE_WEP104: |
| case WLAN_CIPHER_SUITE_TKIP: |
| mac_tmp |= cpu_to_le16(AR9170_TX_MAC_ENCR_RC4); |
| break; |
| case WLAN_CIPHER_SUITE_CCMP: |
| mac_tmp |= cpu_to_le16(AR9170_TX_MAC_ENCR_AES); |
| break; |
| default: |
| WARN_ON(1); |
| goto err_out; |
| } |
| } |
| |
| if (info->flags & IEEE80211_TX_CTL_AMPDU) { |
| unsigned int density, factor; |
| |
| if (unlikely(!sta || !cvif)) |
| goto err_out; |
| |
| factor = min_t(unsigned int, 1u, sta->ht_cap.ampdu_factor); |
| density = sta->ht_cap.ampdu_density; |
| |
| if (density) { |
| /* |
| * Watch out! |
| * |
| * Otus uses slightly different density values than |
| * those from the 802.11n spec. |
| */ |
| |
| density = max_t(unsigned int, density + 1, 7u); |
| } |
| |
| SET_VAL(CARL9170_TX_SUPER_AMPDU_DENSITY, |
| txc->s.ampdu_settings, density); |
| |
| SET_VAL(CARL9170_TX_SUPER_AMPDU_FACTOR, |
| txc->s.ampdu_settings, factor); |
| } |
| |
| txc->s.len = cpu_to_le16(skb->len); |
| txc->f.length = cpu_to_le16(len + FCS_LEN); |
| txc->f.mac_control = mac_tmp; |
| |
| arinfo = (void *)info->rate_driver_data; |
| arinfo->timeout = jiffies; |
| arinfo->ar = ar; |
| kref_init(&arinfo->ref); |
| return 0; |
| |
| err_out: |
| skb_pull(skb, sizeof(*txc)); |
| return -EINVAL; |
| } |
| |
| static void carl9170_set_immba(struct ar9170 *ar, struct sk_buff *skb) |
| { |
| struct _carl9170_tx_superframe *super; |
| |
| super = (void *) skb->data; |
| super->f.mac_control |= cpu_to_le16(AR9170_TX_MAC_IMM_BA); |
| } |
| |
| static void carl9170_set_ampdu_params(struct ar9170 *ar, struct sk_buff *skb) |
| { |
| struct _carl9170_tx_superframe *super; |
| int tmp; |
| |
| super = (void *) skb->data; |
| |
| tmp = (super->s.ampdu_settings & CARL9170_TX_SUPER_AMPDU_DENSITY) << |
| CARL9170_TX_SUPER_AMPDU_DENSITY_S; |
| |
| /* |
| * If you haven't noticed carl9170_tx_prepare has already filled |
| * in all ampdu spacing & factor parameters. |
| * Now it's the time to check whenever the settings have to be |
| * updated by the firmware, or if everything is still the same. |
| * |
| * There's no sane way to handle different density values with |
| * this hardware, so we may as well just do the compare in the |
| * driver. |
| */ |
| |
| if (tmp != ar->current_density) { |
| ar->current_density = tmp; |
| super->s.ampdu_settings |= |
| CARL9170_TX_SUPER_AMPDU_COMMIT_DENSITY; |
| } |
| |
| tmp = (super->s.ampdu_settings & CARL9170_TX_SUPER_AMPDU_FACTOR) << |
| CARL9170_TX_SUPER_AMPDU_FACTOR_S; |
| |
| if (tmp != ar->current_factor) { |
| ar->current_factor = tmp; |
| super->s.ampdu_settings |= |
| CARL9170_TX_SUPER_AMPDU_COMMIT_FACTOR; |
| } |
| } |
| |
| static void carl9170_tx_ampdu(struct ar9170 *ar) |
| { |
| struct sk_buff_head agg; |
| struct carl9170_sta_tid *tid_info; |
| struct sk_buff *skb, *first; |
| struct ieee80211_tx_info *tx_info_first; |
| unsigned int i = 0, done_ampdus = 0; |
| u16 seq, queue, tmpssn; |
| |
| atomic_inc(&ar->tx_ampdu_scheduler); |
| ar->tx_ampdu_schedule = false; |
| |
| if (atomic_read(&ar->tx_ampdu_upload)) |
| return; |
| |
| if (!ar->tx_ampdu_list_len) |
| return; |
| |
| __skb_queue_head_init(&agg); |
| |
| rcu_read_lock(); |
| tid_info = rcu_dereference(ar->tx_ampdu_iter); |
| if (WARN_ON_ONCE(!tid_info)) { |
| rcu_read_unlock(); |
| return; |
| } |
| |
| retry: |
| list_for_each_entry_continue_rcu(tid_info, &ar->tx_ampdu_list, list) { |
| i++; |
| |
| if (tid_info->state < CARL9170_TID_STATE_PROGRESS) |
| continue; |
| |
| queue = TID_TO_WME_AC(tid_info->tid); |
| |
| spin_lock_bh(&tid_info->lock); |
| if (tid_info->state != CARL9170_TID_STATE_XMIT) |
| goto processed; |
| |
| tid_info->counter++; |
| first = skb_peek(&tid_info->queue); |
| tmpssn = carl9170_get_seq(first); |
| seq = tid_info->snx; |
| |
| if (unlikely(tmpssn != seq)) { |
| tid_info->state = CARL9170_TID_STATE_IDLE; |
| |
| goto processed; |
| } |
| |
| tx_info_first = NULL; |
| while ((skb = skb_peek(&tid_info->queue))) { |
| /* strict 0, 1, ..., n - 1, n frame sequence order */ |
| if (unlikely(carl9170_get_seq(skb) != seq)) |
| break; |
| |
| /* don't upload more than AMPDU FACTOR allows. */ |
| if (unlikely(SEQ_DIFF(tid_info->snx, tid_info->bsn) >= |
| (tid_info->max - 1))) |
| break; |
| |
| if (!tx_info_first) { |
| carl9170_tx_get_rates(ar, tid_info->vif, |
| tid_info->sta, first); |
| tx_info_first = IEEE80211_SKB_CB(first); |
| } |
| |
| carl9170_tx_apply_rateset(ar, tx_info_first, skb); |
| |
| atomic_inc(&ar->tx_ampdu_upload); |
| tid_info->snx = seq = SEQ_NEXT(seq); |
| __skb_unlink(skb, &tid_info->queue); |
| |
| __skb_queue_tail(&agg, skb); |
| |
| if (skb_queue_len(&agg) >= CARL9170_NUM_TX_AGG_MAX) |
| break; |
| } |
| |
| if (skb_queue_empty(&tid_info->queue) || |
| carl9170_get_seq(skb_peek(&tid_info->queue)) != |
| tid_info->snx) { |
| /* stop TID, if A-MPDU frames are still missing, |
| * or whenever the queue is empty. |
| */ |
| |
| tid_info->state = CARL9170_TID_STATE_IDLE; |
| } |
| done_ampdus++; |
| |
| processed: |
| spin_unlock_bh(&tid_info->lock); |
| |
| if (skb_queue_empty(&agg)) |
| continue; |
| |
| /* apply ampdu spacing & factor settings */ |
| carl9170_set_ampdu_params(ar, skb_peek(&agg)); |
| |
| /* set aggregation push bit */ |
| carl9170_set_immba(ar, skb_peek_tail(&agg)); |
| |
| spin_lock_bh(&ar->tx_pending[queue].lock); |
| skb_queue_splice_tail_init(&agg, &ar->tx_pending[queue]); |
| spin_unlock_bh(&ar->tx_pending[queue].lock); |
| ar->tx_schedule = true; |
| } |
| if ((done_ampdus++ == 0) && (i++ == 0)) |
| goto retry; |
| |
| rcu_assign_pointer(ar->tx_ampdu_iter, tid_info); |
| rcu_read_unlock(); |
| } |
| |
| static struct sk_buff *carl9170_tx_pick_skb(struct ar9170 *ar, |
| struct sk_buff_head *queue) |
| { |
| struct sk_buff *skb; |
| struct ieee80211_tx_info *info; |
| struct carl9170_tx_info *arinfo; |
| |
| BUILD_BUG_ON(sizeof(*arinfo) > sizeof(info->rate_driver_data)); |
| |
| spin_lock_bh(&queue->lock); |
| skb = skb_peek(queue); |
| if (unlikely(!skb)) |
| goto err_unlock; |
| |
| if (carl9170_alloc_dev_space(ar, skb)) |
| goto err_unlock; |
| |
| __skb_unlink(skb, queue); |
| spin_unlock_bh(&queue->lock); |
| |
| info = IEEE80211_SKB_CB(skb); |
| arinfo = (void *) info->rate_driver_data; |
| |
| arinfo->timeout = jiffies; |
| return skb; |
| |
| err_unlock: |
| spin_unlock_bh(&queue->lock); |
| return NULL; |
| } |
| |
| void carl9170_tx_drop(struct ar9170 *ar, struct sk_buff *skb) |
| { |
| struct _carl9170_tx_superframe *super; |
| uint8_t q = 0; |
| |
| ar->tx_dropped++; |
| |
| super = (void *)skb->data; |
| SET_VAL(CARL9170_TX_SUPER_MISC_QUEUE, q, |
| ar9170_qmap[carl9170_get_queue(ar, skb)]); |
| __carl9170_tx_process_status(ar, super->s.cookie, q); |
| } |
| |
| static bool carl9170_tx_ps_drop(struct ar9170 *ar, struct sk_buff *skb) |
| { |
| struct ieee80211_sta *sta; |
| struct carl9170_sta_info *sta_info; |
| struct ieee80211_tx_info *tx_info; |
| |
| rcu_read_lock(); |
| sta = __carl9170_get_tx_sta(ar, skb); |
| if (!sta) |
| goto out_rcu; |
| |
| sta_info = (void *) sta->drv_priv; |
| tx_info = IEEE80211_SKB_CB(skb); |
| |
| if (unlikely(sta_info->sleeping) && |
| !(tx_info->flags & (IEEE80211_TX_CTL_NO_PS_BUFFER | |
| IEEE80211_TX_CTL_CLEAR_PS_FILT))) { |
| rcu_read_unlock(); |
| |
| if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) |
| atomic_dec(&ar->tx_ampdu_upload); |
| |
| tx_info->flags |= IEEE80211_TX_STAT_TX_FILTERED; |
| carl9170_release_dev_space(ar, skb); |
| carl9170_tx_status(ar, skb, false); |
| return true; |
| } |
| |
| out_rcu: |
| rcu_read_unlock(); |
| return false; |
| } |
| |
| static void carl9170_bar_check(struct ar9170 *ar, struct sk_buff *skb) |
| { |
| struct _carl9170_tx_superframe *super = (void *) skb->data; |
| struct ieee80211_bar *bar = (void *) super->frame_data; |
| |
| if (unlikely(ieee80211_is_back_req(bar->frame_control)) && |
| skb->len >= sizeof(struct ieee80211_bar)) { |
| struct carl9170_bar_list_entry *entry; |
| unsigned int queue = skb_get_queue_mapping(skb); |
| |
| entry = kmalloc(sizeof(*entry), GFP_ATOMIC); |
| if (!WARN_ON_ONCE(!entry)) { |
| entry->skb = skb; |
| spin_lock_bh(&ar->bar_list_lock[queue]); |
| list_add_tail_rcu(&entry->list, &ar->bar_list[queue]); |
| spin_unlock_bh(&ar->bar_list_lock[queue]); |
| } |
| } |
| } |
| |
| static void carl9170_tx(struct ar9170 *ar) |
| { |
| struct sk_buff *skb; |
| unsigned int i, q; |
| bool schedule_garbagecollector = false; |
| |
| ar->tx_schedule = false; |
| |
| if (unlikely(!IS_STARTED(ar))) |
| return; |
| |
| carl9170_usb_handle_tx_err(ar); |
| |
| for (i = 0; i < ar->hw->queues; i++) { |
| while (!skb_queue_empty(&ar->tx_pending[i])) { |
| skb = carl9170_tx_pick_skb(ar, &ar->tx_pending[i]); |
| if (unlikely(!skb)) |
| break; |
| |
| if (unlikely(carl9170_tx_ps_drop(ar, skb))) |
| continue; |
| |
| carl9170_bar_check(ar, skb); |
| |
| atomic_inc(&ar->tx_total_pending); |
| |
| q = __carl9170_get_queue(ar, i); |
| /* |
| * NB: tx_status[i] vs. tx_status[q], |
| * TODO: Move into pick_skb or alloc_dev_space. |
| */ |
| skb_queue_tail(&ar->tx_status[q], skb); |
| |
| /* |
| * increase ref count to "2". |
| * Ref counting is the easiest way to solve the |
| * race between the urb's completion routine: |
| * carl9170_tx_callback |
| * and wlan tx status functions: |
| * carl9170_tx_status/janitor. |
| */ |
| carl9170_tx_get_skb(skb); |
| |
| carl9170_usb_tx(ar, skb); |
| schedule_garbagecollector = true; |
| } |
| } |
| |
| if (!schedule_garbagecollector) |
| return; |
| |
| ieee80211_queue_delayed_work(ar->hw, &ar->tx_janitor, |
| msecs_to_jiffies(CARL9170_TX_TIMEOUT)); |
| } |
| |
| static bool carl9170_tx_ampdu_queue(struct ar9170 *ar, |
| struct ieee80211_sta *sta, struct sk_buff *skb, |
| struct ieee80211_tx_info *txinfo) |
| { |
| struct carl9170_sta_info *sta_info; |
| struct carl9170_sta_tid *agg; |
| struct sk_buff *iter; |
| u16 tid, seq, qseq, off; |
| bool run = false; |
| |
| tid = carl9170_get_tid(skb); |
| seq = carl9170_get_seq(skb); |
| sta_info = (void *) sta->drv_priv; |
| |
| rcu_read_lock(); |
| agg = rcu_dereference(sta_info->agg[tid]); |
| |
| if (!agg) |
| goto err_unlock_rcu; |
| |
| spin_lock_bh(&agg->lock); |
| if (unlikely(agg->state < CARL9170_TID_STATE_IDLE)) |
| goto err_unlock; |
| |
| /* check if sequence is within the BA window */ |
| if (unlikely(!BAW_WITHIN(agg->bsn, CARL9170_BAW_BITS, seq))) |
| goto err_unlock; |
| |
| if (WARN_ON_ONCE(!BAW_WITHIN(agg->snx, CARL9170_BAW_BITS, seq))) |
| goto err_unlock; |
| |
| off = SEQ_DIFF(seq, agg->bsn); |
| if (WARN_ON_ONCE(test_and_set_bit(off, agg->bitmap))) |
| goto err_unlock; |
| |
| if (likely(BAW_WITHIN(agg->hsn, CARL9170_BAW_BITS, seq))) { |
| __skb_queue_tail(&agg->queue, skb); |
| agg->hsn = seq; |
| goto queued; |
| } |
| |
| skb_queue_reverse_walk(&agg->queue, iter) { |
| qseq = carl9170_get_seq(iter); |
| |
| if (BAW_WITHIN(qseq, CARL9170_BAW_BITS, seq)) { |
| __skb_queue_after(&agg->queue, iter, skb); |
| goto queued; |
| } |
| } |
| |
| __skb_queue_head(&agg->queue, skb); |
| queued: |
| |
| if (unlikely(agg->state != CARL9170_TID_STATE_XMIT)) { |
| if (agg->snx == carl9170_get_seq(skb_peek(&agg->queue))) { |
| agg->state = CARL9170_TID_STATE_XMIT; |
| run = true; |
| } |
| } |
| |
| spin_unlock_bh(&agg->lock); |
| rcu_read_unlock(); |
| |
| return run; |
| |
| err_unlock: |
| spin_unlock_bh(&agg->lock); |
| |
| err_unlock_rcu: |
| rcu_read_unlock(); |
| txinfo->flags &= ~IEEE80211_TX_CTL_AMPDU; |
| carl9170_tx_status(ar, skb, false); |
| ar->tx_dropped++; |
| return false; |
| } |
| |
| void carl9170_op_tx(struct ieee80211_hw *hw, |
| struct ieee80211_tx_control *control, |
| struct sk_buff *skb) |
| { |
| struct ar9170 *ar = hw->priv; |
| struct ieee80211_tx_info *info; |
| struct ieee80211_sta *sta = control->sta; |
| struct ieee80211_vif *vif; |
| bool run; |
| |
| if (unlikely(!IS_STARTED(ar))) |
| goto err_free; |
| |
| info = IEEE80211_SKB_CB(skb); |
| vif = info->control.vif; |
| |
| if (unlikely(carl9170_tx_prepare(ar, sta, skb))) |
| goto err_free; |
| |
| carl9170_tx_accounting(ar, skb); |
| /* |
| * from now on, one has to use carl9170_tx_status to free |
| * all ressouces which are associated with the frame. |
| */ |
| |
| if (sta) { |
| struct carl9170_sta_info *stai = (void *) sta->drv_priv; |
| atomic_inc(&stai->pending_frames); |
| } |
| |
| if (info->flags & IEEE80211_TX_CTL_AMPDU) { |
| /* to static code analyzers and reviewers: |
| * mac80211 guarantees that a valid "sta" |
| * reference is present, if a frame is to |
| * be part of an ampdu. Hence any extra |
| * sta == NULL checks are redundant in this |
| * special case. |
| */ |
| run = carl9170_tx_ampdu_queue(ar, sta, skb, info); |
| if (run) |
| carl9170_tx_ampdu(ar); |
| |
| } else { |
| unsigned int queue = skb_get_queue_mapping(skb); |
| |
| carl9170_tx_get_rates(ar, vif, sta, skb); |
| carl9170_tx_apply_rateset(ar, info, skb); |
| skb_queue_tail(&ar->tx_pending[queue], skb); |
| } |
| |
| carl9170_tx(ar); |
| return; |
| |
| err_free: |
| ar->tx_dropped++; |
| ieee80211_free_txskb(ar->hw, skb); |
| } |
| |
| void carl9170_tx_scheduler(struct ar9170 *ar) |
| { |
| |
| if (ar->tx_ampdu_schedule) |
| carl9170_tx_ampdu(ar); |
| |
| if (ar->tx_schedule) |
| carl9170_tx(ar); |
| } |
| |
| /* caller has to take rcu_read_lock */ |
| static struct carl9170_vif_info *carl9170_pick_beaconing_vif(struct ar9170 *ar) |
| { |
| struct carl9170_vif_info *cvif; |
| int i = 1; |
| |
| /* The AR9170 hardware has no fancy beacon queue or some |
| * other scheduling mechanism. So, the driver has to make |
| * due by setting the two beacon timers (pretbtt and tbtt) |
| * once and then swapping the beacon address in the HW's |
| * register file each time the pretbtt fires. |
| */ |
| |
| cvif = rcu_dereference(ar->beacon_iter); |
| if (ar->vifs > 0 && cvif) { |
| do { |
| list_for_each_entry_continue_rcu(cvif, &ar->vif_list, |
| list) { |
| if (cvif->active && cvif->enable_beacon) |
| goto out; |
| } |
| } while (ar->beacon_enabled && i--); |
| } |
| |
| out: |
| RCU_INIT_POINTER(ar->beacon_iter, cvif); |
| return cvif; |
| } |
| |
| static bool carl9170_tx_beacon_physet(struct ar9170 *ar, struct sk_buff *skb, |
| u32 *ht1, u32 *plcp) |
| { |
| struct ieee80211_tx_info *txinfo; |
| struct ieee80211_tx_rate *rate; |
| unsigned int power, chains; |
| bool ht_rate; |
| |
| txinfo = IEEE80211_SKB_CB(skb); |
| rate = &txinfo->control.rates[0]; |
| ht_rate = !!(txinfo->control.rates[0].flags & IEEE80211_TX_RC_MCS); |
| carl9170_tx_rate_tpc_chains(ar, txinfo, rate, plcp, &power, &chains); |
| |
| *ht1 = AR9170_MAC_BCN_HT1_TX_ANT0; |
| if (chains == AR9170_TX_PHY_TXCHAIN_2) |
| *ht1 |= AR9170_MAC_BCN_HT1_TX_ANT1; |
| SET_VAL(AR9170_MAC_BCN_HT1_PWR_CTRL, *ht1, 7); |
| SET_VAL(AR9170_MAC_BCN_HT1_TPC, *ht1, power); |
| SET_VAL(AR9170_MAC_BCN_HT1_CHAIN_MASK, *ht1, chains); |
| |
| if (ht_rate) { |
| *ht1 |= AR9170_MAC_BCN_HT1_HT_EN; |
| if (rate->flags & IEEE80211_TX_RC_SHORT_GI) |
| *plcp |= AR9170_MAC_BCN_HT2_SGI; |
| |
| if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) { |
| *ht1 |= AR9170_MAC_BCN_HT1_BWC_40M_SHARED; |
| *plcp |= AR9170_MAC_BCN_HT2_BW40; |
| } else if (rate->flags & IEEE80211_TX_RC_DUP_DATA) { |
| *ht1 |= AR9170_MAC_BCN_HT1_BWC_40M_DUP; |
| *plcp |= AR9170_MAC_BCN_HT2_BW40; |
| } |
| |
| SET_VAL(AR9170_MAC_BCN_HT2_LEN, *plcp, skb->len + FCS_LEN); |
| } else { |
| if (*plcp <= AR9170_TX_PHY_RATE_CCK_11M) |
| *plcp |= ((skb->len + FCS_LEN) << (3 + 16)) + 0x0400; |
| else |
| *plcp |= ((skb->len + FCS_LEN) << 16) + 0x0010; |
| } |
| |
| return ht_rate; |
| } |
| |
| int carl9170_update_beacon(struct ar9170 *ar, const bool submit) |
| { |
| struct sk_buff *skb = NULL; |
| struct carl9170_vif_info *cvif; |
| __le32 *data, *old = NULL; |
| u32 word, ht1, plcp, off, addr, len; |
| int i = 0, err = 0; |
| bool ht_rate; |
| |
| rcu_read_lock(); |
| cvif = carl9170_pick_beaconing_vif(ar); |
| if (!cvif) |
| goto out_unlock; |
| |
| skb = ieee80211_beacon_get_tim(ar->hw, carl9170_get_vif(cvif), |
| NULL, NULL); |
| |
| if (!skb) { |
| err = -ENOMEM; |
| goto err_free; |
| } |
| |
| spin_lock_bh(&ar->beacon_lock); |
| data = (__le32 *)skb->data; |
| if (cvif->beacon) |
| old = (__le32 *)cvif->beacon->data; |
| |
| off = cvif->id * AR9170_MAC_BCN_LENGTH_MAX; |
| addr = ar->fw.beacon_addr + off; |
| len = roundup(skb->len + FCS_LEN, 4); |
| |
| if ((off + len) > ar->fw.beacon_max_len) { |
| if (net_ratelimit()) { |
| wiphy_err(ar->hw->wiphy, "beacon does not " |
| "fit into device memory!\n"); |
| } |
| err = -EINVAL; |
| goto err_unlock; |
| } |
| |
| if (len > AR9170_MAC_BCN_LENGTH_MAX) { |
| if (net_ratelimit()) { |
| wiphy_err(ar->hw->wiphy, "no support for beacons " |
| "bigger than %d (yours:%d).\n", |
| AR9170_MAC_BCN_LENGTH_MAX, len); |
| } |
| |
| err = -EMSGSIZE; |
| goto err_unlock; |
| } |
| |
| ht_rate = carl9170_tx_beacon_physet(ar, skb, &ht1, &plcp); |
| |
| carl9170_async_regwrite_begin(ar); |
| carl9170_async_regwrite(AR9170_MAC_REG_BCN_HT1, ht1); |
| if (ht_rate) |
| carl9170_async_regwrite(AR9170_MAC_REG_BCN_HT2, plcp); |
| else |
| carl9170_async_regwrite(AR9170_MAC_REG_BCN_PLCP, plcp); |
| |
| for (i = 0; i < DIV_ROUND_UP(skb->len, 4); i++) { |
| /* |
| * XXX: This accesses beyond skb data for up |
| * to the last 3 bytes!! |
| */ |
| |
| if (old && (data[i] == old[i])) |
| continue; |
| |
| word = le32_to_cpu(data[i]); |
| carl9170_async_regwrite(addr + 4 * i, word); |
| } |
| carl9170_async_regwrite_finish(); |
| |
| dev_kfree_skb_any(cvif->beacon); |
| cvif->beacon = NULL; |
| |
| err = carl9170_async_regwrite_result(); |
| if (!err) |
| cvif->beacon = skb; |
| spin_unlock_bh(&ar->beacon_lock); |
| if (err) |
| goto err_free; |
| |
| if (submit) { |
| err = carl9170_bcn_ctrl(ar, cvif->id, |
| CARL9170_BCN_CTRL_CAB_TRIGGER, |
| addr, skb->len + FCS_LEN); |
| |
| if (err) |
| goto err_free; |
| } |
| out_unlock: |
| rcu_read_unlock(); |
| return 0; |
| |
| err_unlock: |
| spin_unlock_bh(&ar->beacon_lock); |
| |
| err_free: |
| rcu_read_unlock(); |
| dev_kfree_skb_any(skb); |
| return err; |
| } |