/drivers/net/wireless/ath/carl9170/tx.c
C | 1335 lines | 862 code | 273 blank | 200 comment | 160 complexity | fcdda21d854978fa6b58a9cabb41a09a MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
- /*
- * 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/init.h>
- #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);
- }
- static void carl9170_tx_accounting_free(struct ar9170 *ar, struct sk_buff *skb)
- {
- struct ieee80211_tx_info *txinfo;
- int queue;
- txinfo = IEEE80211_SKB_CB(skb);
- 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.ampdu_ack_len) != 23);
- memset(&txinfo->status.ampdu_ack_len, 0,
- sizeof(struct ieee80211_tx_info) -
- offsetof(struct ieee80211_tx_info, status.ampdu_ack_len));
- 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) {
- txinfo->status.ampdu_len = txinfo->pad[0];
- txinfo->status.ampdu_ack_len = txinfo->pad[1];
- txinfo->pad[0] = txinfo->pad[1] = 0;
- } else if (txinfo->flags & IEEE80211_TX_STAT_ACK) {
- /*
- * 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.
- */
- dev_kfree_skb_any(skb);
- return;
- } else {
- /*
- * Frame has failed, but we want to keep it in
- * case it was lost due to a power-state
- * transition.
- */
- }
- }
- 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_tx_info *tx_info;
- struct carl9170_tx_info *ar_info;
- struct carl9170_sta_info *sta_info;
- struct ieee80211_sta *sta;
- struct carl9170_sta_tid *tid_info;
- struct ieee80211_vif *vif;
- unsigned int vif_id;
- u8 tid;
- if (!(txinfo->flags & IEEE80211_TX_CTL_AMPDU) ||
- txinfo->flags & IEEE80211_TX_CTL_INJECTED)
- return;
- tx_info = IEEE80211_SKB_CB(skb);
- ar_info = (void *) tx_info->rate_driver_data;
- 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;
- rcu_read_lock();
- vif = rcu_dereference(ar->vif_priv[vif_id].vif);
- if (unlikely(!vif))
- goto out_rcu;
- /*
- * 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.
- */
- sta = ieee80211_find_sta(vif, hdr->addr1);
- 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].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 (super->f.mac_control & cpu_to_le16(AR9170_TX_MAC_IMM_BA)) {
- txinfo->pad[0] = sta_info->stats[tid].ampdu_len;
- txinfo->pad[1] = sta_info->stats[tid].ampdu_ack_len;
- txinfo->flags |= IEEE80211_TX_STAT_AMPDU;
- sta_info->stats[tid].clear = true;
- }
- spin_unlock_bh(&tid_info->lock);
- out_rcu:
- 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);
- 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_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);
- }
- }
- 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);
- 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;
- struct carl9170_tx_info *arinfo;
- 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);
- arinfo = (void *) txinfo->rate_driver_data;
- 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 __le32 carl9170_tx_physet(struct ar9170 *ar,
- struct ieee80211_tx_info *info, struct ieee80211_tx_rate *txrate)
- {
- struct ieee80211_rate *rate = NULL;
- u32 power, chains;
- __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) {
- u32 r = txrate->idx;
- u8 *txpower;
- /* heavy clip control */
- tmp |= cpu_to_le32((r & 0x7) <<
- AR9170_TX_PHY_TX_HEAVY_CLIP_S);
- if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) {
- if (info->band == IEEE80211_BAND_5GHZ)
- txpower = ar->power_5G_ht40;
- else
- txpower = ar->power_2G_ht40;
- } else {
- if (info->band == IEEE80211_BAND_5GHZ)
- txpower = ar->power_5G_ht20;
- else
- txpower = ar->power_2G_ht20;
- }
- power = txpower[r & 7];
- /* +1 dBm for HT40 */
- if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
- power += 2;
- r <<= AR9170_TX_PHY_MCS_S;
- BUG_ON(r & ~AR9170_TX_PHY_MCS);
- tmp |= cpu_to_le32(r & AR9170_TX_PHY_MCS);
- 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 {
- u8 *txpower;
- u32 mod;
- u32 phyrate;
- u8 idx = txrate->idx;
- if (info->band != IEEE80211_BAND_2GHZ) {
- idx += 4;
- txpower = ar->power_5G_leg;
- mod = AR9170_TX_PHY_MOD_OFDM;
- } else {
- if (idx < 4) {
- txpower = ar->power_2G_cck;
- mod = AR9170_TX_PHY_MOD_CCK;
- } else {
- mod = AR9170_TX_PHY_MOD_OFDM;
- txpower = ar->power_2G_ofdm;
- }
- }
- rate = &__carl9170_ratetable[idx];
- phyrate = rate->hw_value & 0xF;
- power = txpower[(rate->hw_value & 0x30) >> 4];
- phyrate <<= AR9170_TX_PHY_MCS_S;
- tmp |= cpu_to_le32(mod);
- tmp |= cpu_to_le32(phyrate);
- /*
- * 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);
- */
- }
- power <<= AR9170_TX_PHY_TX_PWR_S;
- power &= AR9170_TX_PHY_TX_PWR;
- tmp |= cpu_to_le32(power);
- /* set TX chains */
- if (ar->eeprom.tx_mask == 1) {
- chains = AR9170_TX_PHY_TXCHAIN_1;
- } else {
- chains = AR9170_TX_PHY_TXCHAIN_2;
- /* >= 36M legacy OFDM - use only one chain */
- if (rate && rate->bitrate >= 360 &&
- !(txrate->flags & IEEE80211_TX_RC_MCS))
- chains = AR9170_TX_PHY_TXCHAIN_1;
- }
- tmp |= cpu_to_le32(chains << AR9170_TX_PHY_TXCHAIN_S);
- 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 int carl9170_tx_prepare(struct ar9170 *ar, struct sk_buff *skb)
- {
- struct ieee80211_hdr *hdr;
- struct _carl9170_tx_superframe *txc;
- struct carl9170_vif_info *cvif;
- struct ieee80211_tx_info *info;
- struct ieee80211_tx_rate *txrate;
- struct ieee80211_sta *sta;
- struct carl9170_tx_info *arinfo;
- unsigned int hw_queue;
- int i;
- __le16 mac_tmp;
- u16 len;
- bool ampdu, no_ack;
- 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(IEEE80211_TX_MAX_RATES < CARL9170_TX_MAX_RATES);
- 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;
- sta = info->control.sta;
- 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(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);
- no_ack = !!(info->flags & IEEE80211_TX_CTL_NO_ACK);
- if (unlikely(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;
- }
- }
- ampdu = !!(info->flags & IEEE80211_TX_CTL_AMPDU);
- if (ampdu) {
- unsigned int density, factor;
- if (unlikely(!sta || !cvif))
- goto err_out;
- factor = min_t(unsigned int, 1u,
- info->control.sta->ht_cap.ampdu_factor);
- density = info->control.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);
- for (i = 0; i < CARL9170_TX_MAX_RATES; i++) {
- txrate = &info->control.rates[i];
- if (txrate->idx >= 0) {
- txc->s.ri[i] =
- CARL9170_TX_SUPER_RI_AMPDU;
- if (WARN_ON(!(txrate->flags &
- IEEE80211_TX_RC_MCS))) {
- /*
- * Not sure if it's even possible
- * to aggregate non-ht rates with
- * this HW.
- */
- goto err_out;
- }
- continue;
- }
- txrate->idx = 0;
- txrate->count = ar->hw->max_rate_tries;
- }
- mac_tmp |= cpu_to_le16(AR9170_TX_MAC_AGGR);
- }
- /*
- * 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 = 1; i < CARL9170_TX_MAX_RATES; i++) {
- txrate = &info->control.rates[i];
- if (txrate->idx < 0)
- break;
- 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);
- txc->s.rr[i - 1] = carl9170_tx_physet(ar, info, txrate);
- }
- txrate = &info->control.rates[0];
- SET_VAL(CARL9170_TX_SUPER_RI_TRIES, txc->s.ri[0], txrate->count);
- 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->s.len = cpu_to_le16(skb->len);
- txc->f.length = cpu_to_le16(len + FCS_LEN);
- txc->f.mac_control = mac_tmp;
- txc->f.phy_control = carl9170_tx_physet(ar, info, txrate);
- 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 bool carl9170_tx_rate_check(struct ar9170 *ar, struct sk_buff *_dest,
- struct sk_buff *_src)
- {
- struct _carl9170_tx_superframe *dest, *src;
- dest = (void *) _dest->data;
- src = (void *) _src->data;
- /*
- * The mac80211 rate control algorithm expects that all MPDUs in
- * an AMPDU share the same tx vectors.
- * This is not really obvious right now, because the hardware
- * does the AMPDU setup according to its own rulebook.
- * Our nicely assembled, strictly monotonic increasing mpdu
- * chains will be broken up, mashed back together...
- */
- return (dest->f.phy_control == src->f.phy_control);
- }
- static void carl9170_tx_ampdu(struct ar9170 *ar)
- {
- struct sk_buff_head agg;
- struct carl9170_sta_tid *tid_info;
- struct sk_buff *skb, *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;
- }
- 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 (!carl9170_tx_rate_check(ar, skb, first))
- break;
- 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;
- /*
- * increase ref count to "2".
- * Ref counting is the easiest way to solve the race between
- * the the urb's completion routine: carl9170_tx_callback and
- * wlan tx status functions: carl9170_tx_status/janitor.
- */
- carl9170_tx_get_skb(skb);
- 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 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;
- 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);
- 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 carl9170_sta_info *sta_info;
- struct carl9170_sta_tid *agg;
- struct sk_buff *iter;
- unsigned int max;
- 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]);
- max = sta_info->ampdu_max_len;
- 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();
- carl9170_tx_status(ar, skb, false);
- ar->tx_dropped++;
- return false;
- }
- int carl9170_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
- {
- struct ar9170 *ar = hw->priv;
- struct ieee80211_tx_info *info;
- struct ieee80211_sta *sta;
- bool run;
- if (unlikely(!IS_STARTED(ar)))
- goto err_free;
- info = IEEE80211_SKB_CB(skb);
- sta = info->control.sta;
- if (unlikely(carl9170_tx_prepare(ar, 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 (info->flags & IEEE80211_TX_CTL_AMPDU) {
- if (WARN_ON_ONCE(!sta))
- goto err_free;
- run = carl9170_tx_ampdu_queue(ar, sta, skb);
- if (run)
- carl9170_tx_ampdu(ar);
- } else {
- unsigned int queue = skb_get_queue_mapping(skb);
- skb_queue_tail(&ar->tx_pending[queue], skb);
- }
- carl9170_tx(ar);
- return NETDEV_TX_OK;
- err_free:
- ar->tx_dropped++;
- dev_kfree_skb_any(skb);
- return NETDEV_TX_OK;
- }
- void carl9170_tx_scheduler(struct ar9170 *ar)
- {
- if (ar->tx_ampdu_schedule)
- carl9170_tx_ampdu(ar);
- if (ar->tx_schedule)
- carl9170_tx(ar);
- }