--- /dev/null
+/*
+ * 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 == IEEE80211_BAND_2GHZ)
+ txpower = ar->power_2G_ht40;
+ else
+ txpower = ar->power_5G_ht40;
+ } else {
+ if (info->band == IEEE80211_BAND_2GHZ)
+ txpower = ar->power_2G_ht20;
+ else
+ txpower = ar->power_5G_ht20;
+ }
+
+ *phyrate = txrate->idx;
+ *tpc += txpower[idx & 7];
+ } else {
+ if (info->band == IEEE80211_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 == IEEE80211_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 = (void *)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;
+}
Code Review / kvmfornfv.git / blobdiff