/****************************************************************************** * * GPL LICENSE SUMMARY * * Copyright(c) 2008 - 2012 Intel Corporation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, * USA * * The full GNU General Public License is included in this distribution * in the file called LICENSE.GPL. * * Contact Information: * Intel Linux Wireless * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 * *****************************************************************************/ #include #include #include #include #include #include "iwl-dev.h" #include "iwl-core.h" #include "iwl-io.h" #include "iwl-agn-hw.h" #include "iwl-agn.h" #include "iwl-trans.h" static const u8 tid_to_ac[] = { IEEE80211_AC_BE, IEEE80211_AC_BK, IEEE80211_AC_BK, IEEE80211_AC_BE, IEEE80211_AC_VI, IEEE80211_AC_VI, IEEE80211_AC_VO, IEEE80211_AC_VO, }; static void iwlagn_tx_cmd_protection(struct iwl_priv *priv, struct ieee80211_tx_info *info, __le16 fc, __le32 *tx_flags) { if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS || info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT || info->flags & IEEE80211_TX_CTL_AMPDU) *tx_flags |= TX_CMD_FLG_PROT_REQUIRE_MSK; } /* * handle build REPLY_TX command notification. */ static void iwlagn_tx_cmd_build_basic(struct iwl_priv *priv, struct sk_buff *skb, struct iwl_tx_cmd *tx_cmd, struct ieee80211_tx_info *info, struct ieee80211_hdr *hdr, u8 sta_id) { __le16 fc = hdr->frame_control; __le32 tx_flags = tx_cmd->tx_flags; tx_cmd->stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE; if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) tx_flags |= TX_CMD_FLG_ACK_MSK; else tx_flags &= ~TX_CMD_FLG_ACK_MSK; if (ieee80211_is_probe_resp(fc)) tx_flags |= TX_CMD_FLG_TSF_MSK; else if (ieee80211_is_back_req(fc)) tx_flags |= TX_CMD_FLG_ACK_MSK | TX_CMD_FLG_IMM_BA_RSP_MASK; else if (info->band == IEEE80211_BAND_2GHZ && priv->cfg->bt_params && priv->cfg->bt_params->advanced_bt_coexist && (ieee80211_is_auth(fc) || ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc) || skb->protocol == cpu_to_be16(ETH_P_PAE))) tx_flags |= TX_CMD_FLG_IGNORE_BT; tx_cmd->sta_id = sta_id; if (ieee80211_has_morefrags(fc)) tx_flags |= TX_CMD_FLG_MORE_FRAG_MSK; if (ieee80211_is_data_qos(fc)) { u8 *qc = ieee80211_get_qos_ctl(hdr); tx_cmd->tid_tspec = qc[0] & 0xf; tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK; } else { tx_cmd->tid_tspec = IWL_TID_NON_QOS; if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK; else tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK; } iwlagn_tx_cmd_protection(priv, info, fc, &tx_flags); tx_flags &= ~(TX_CMD_FLG_ANT_SEL_MSK); if (ieee80211_is_mgmt(fc)) { if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc)) tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(3); else tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(2); } else { tx_cmd->timeout.pm_frame_timeout = 0; } tx_cmd->driver_txop = 0; tx_cmd->tx_flags = tx_flags; tx_cmd->next_frame_len = 0; } static void iwlagn_tx_cmd_build_rate(struct iwl_priv *priv, struct iwl_tx_cmd *tx_cmd, struct ieee80211_tx_info *info, __le16 fc) { u32 rate_flags; int rate_idx; u8 rts_retry_limit; u8 data_retry_limit; u8 rate_plcp; if (priv->wowlan) { rts_retry_limit = IWLAGN_LOW_RETRY_LIMIT; data_retry_limit = IWLAGN_LOW_RETRY_LIMIT; } else { /* Set retry limit on RTS packets */ rts_retry_limit = IWLAGN_RTS_DFAULT_RETRY_LIMIT; /* Set retry limit on DATA packets and Probe Responses*/ if (ieee80211_is_probe_resp(fc)) { data_retry_limit = IWLAGN_MGMT_DFAULT_RETRY_LIMIT; rts_retry_limit = min(data_retry_limit, rts_retry_limit); } else if (ieee80211_is_back_req(fc)) data_retry_limit = IWLAGN_BAR_DFAULT_RETRY_LIMIT; else data_retry_limit = IWLAGN_DEFAULT_TX_RETRY; } tx_cmd->data_retry_limit = data_retry_limit; tx_cmd->rts_retry_limit = rts_retry_limit; /* DATA packets will use the uCode station table for rate/antenna * selection */ if (ieee80211_is_data(fc)) { tx_cmd->initial_rate_index = 0; tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK; #ifdef CONFIG_IWLWIFI_DEVICE_TESTMODE if (priv->tm_fixed_rate) { /* * rate overwrite by testmode * we not only send lq command to change rate * we also re-enforce per data pkt base. */ tx_cmd->tx_flags &= ~TX_CMD_FLG_STA_RATE_MSK; memcpy(&tx_cmd->rate_n_flags, &priv->tm_fixed_rate, sizeof(tx_cmd->rate_n_flags)); } #endif return; } else if (ieee80211_is_back_req(fc)) tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK; /** * If the current TX rate stored in mac80211 has the MCS bit set, it's * not really a TX rate. Thus, we use the lowest supported rate for * this band. Also use the lowest supported rate if the stored rate * index is invalid. */ rate_idx = info->control.rates[0].idx; if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS || (rate_idx < 0) || (rate_idx > IWL_RATE_COUNT_LEGACY)) rate_idx = rate_lowest_index(&priv->bands[info->band], info->control.sta); /* For 5 GHZ band, remap mac80211 rate indices into driver indices */ if (info->band == IEEE80211_BAND_5GHZ) rate_idx += IWL_FIRST_OFDM_RATE; /* Get PLCP rate for tx_cmd->rate_n_flags */ rate_plcp = iwl_rates[rate_idx].plcp; /* Zero out flags for this packet */ rate_flags = 0; /* Set CCK flag as needed */ if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE)) rate_flags |= RATE_MCS_CCK_MSK; /* Set up antennas */ if (priv->cfg->bt_params && priv->cfg->bt_params->advanced_bt_coexist && priv->bt_full_concurrent) { /* operated as 1x1 in full concurrency mode */ priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant, first_antenna(priv->hw_params.valid_tx_ant)); } else priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant, priv->hw_params.valid_tx_ant); rate_flags |= iwl_ant_idx_to_flags(priv->mgmt_tx_ant); /* Set the rate in the TX cmd */ tx_cmd->rate_n_flags = iwl_hw_set_rate_n_flags(rate_plcp, rate_flags); } static void iwlagn_tx_cmd_build_hwcrypto(struct iwl_priv *priv, struct ieee80211_tx_info *info, struct iwl_tx_cmd *tx_cmd, struct sk_buff *skb_frag) { struct ieee80211_key_conf *keyconf = info->control.hw_key; switch (keyconf->cipher) { case WLAN_CIPHER_SUITE_CCMP: tx_cmd->sec_ctl = TX_CMD_SEC_CCM; memcpy(tx_cmd->key, keyconf->key, keyconf->keylen); if (info->flags & IEEE80211_TX_CTL_AMPDU) tx_cmd->tx_flags |= TX_CMD_FLG_AGG_CCMP_MSK; IWL_DEBUG_TX(priv, "tx_cmd with AES hwcrypto\n"); break; case WLAN_CIPHER_SUITE_TKIP: tx_cmd->sec_ctl = TX_CMD_SEC_TKIP; ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key); IWL_DEBUG_TX(priv, "tx_cmd with tkip hwcrypto\n"); break; case WLAN_CIPHER_SUITE_WEP104: tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128; /* fall through */ case WLAN_CIPHER_SUITE_WEP40: tx_cmd->sec_ctl |= (TX_CMD_SEC_WEP | (keyconf->keyidx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT); memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen); IWL_DEBUG_TX(priv, "Configuring packet for WEP encryption " "with key %d\n", keyconf->keyidx); break; default: IWL_ERR(priv, "Unknown encode cipher %x\n", keyconf->cipher); break; } } /** * iwl_sta_id_or_broadcast - return sta_id or broadcast sta * @context: the current context * @sta: mac80211 station * * In certain circumstances mac80211 passes a station pointer * that may be %NULL, for example during TX or key setup. In * that case, we need to use the broadcast station, so this * inline wraps that pattern. */ static int iwl_sta_id_or_broadcast(struct iwl_rxon_context *context, struct ieee80211_sta *sta) { int sta_id; if (!sta) return context->bcast_sta_id; sta_id = iwl_sta_id(sta); /* * mac80211 should not be passing a partially * initialised station! */ WARN_ON(sta_id == IWL_INVALID_STATION); return sta_id; } /* * start REPLY_TX command process */ int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb) { struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); struct iwl_station_priv *sta_priv = NULL; struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS]; struct iwl_device_cmd *dev_cmd = NULL; struct iwl_tx_cmd *tx_cmd; __le16 fc; u8 hdr_len; u16 len, seq_number = 0; u8 sta_id, tid = IWL_MAX_TID_COUNT; bool is_agg = false; int txq_id; if (info->control.vif) ctx = iwl_rxon_ctx_from_vif(info->control.vif); if (iwl_is_rfkill(priv)) { IWL_DEBUG_DROP(priv, "Dropping - RF KILL\n"); goto drop_unlock_priv; } fc = hdr->frame_control; #ifdef CONFIG_IWLWIFI_DEBUG if (ieee80211_is_auth(fc)) IWL_DEBUG_TX(priv, "Sending AUTH frame\n"); else if (ieee80211_is_assoc_req(fc)) IWL_DEBUG_TX(priv, "Sending ASSOC frame\n"); else if (ieee80211_is_reassoc_req(fc)) IWL_DEBUG_TX(priv, "Sending REASSOC frame\n"); #endif if (unlikely(ieee80211_is_probe_resp(fc))) { struct iwl_wipan_noa_data *noa_data = rcu_dereference(priv->noa_data); if (noa_data && pskb_expand_head(skb, 0, noa_data->length, GFP_ATOMIC) == 0) { memcpy(skb_put(skb, noa_data->length), noa_data->data, noa_data->length); hdr = (struct ieee80211_hdr *)skb->data; } } hdr_len = ieee80211_hdrlen(fc); /* For management frames use broadcast id to do not break aggregation */ if (!ieee80211_is_data(fc)) sta_id = ctx->bcast_sta_id; else { /* Find index into station table for destination station */ sta_id = iwl_sta_id_or_broadcast(ctx, info->control.sta); if (sta_id == IWL_INVALID_STATION) { IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n", hdr->addr1); goto drop_unlock_priv; } } IWL_DEBUG_TX(priv, "station Id %d\n", sta_id); if (info->control.sta) sta_priv = (void *)info->control.sta->drv_priv; if (sta_priv && sta_priv->asleep && (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER)) { /* * This sends an asynchronous command to the device, * but we can rely on it being processed before the * next frame is processed -- and the next frame to * this station is the one that will consume this * counter. * For now set the counter to just 1 since we do not * support uAPSD yet. * * FIXME: If we get two non-bufferable frames one * after the other, we might only send out one of * them because this is racy. */ iwl_sta_modify_sleep_tx_count(priv, sta_id, 1); } if (info->flags & IEEE80211_TX_CTL_AMPDU) is_agg = true; dev_cmd = kmem_cache_alloc(iwl_tx_cmd_pool, GFP_ATOMIC); if (unlikely(!dev_cmd)) goto drop_unlock_priv; memset(dev_cmd, 0, sizeof(*dev_cmd)); tx_cmd = (struct iwl_tx_cmd *) dev_cmd->payload; /* Total # bytes to be transmitted */ len = (u16)skb->len; tx_cmd->len = cpu_to_le16(len); if (info->control.hw_key) iwlagn_tx_cmd_build_hwcrypto(priv, info, tx_cmd, skb); /* TODO need this for burst mode later on */ iwlagn_tx_cmd_build_basic(priv, skb, tx_cmd, info, hdr, sta_id); iwl_dbg_log_tx_data_frame(priv, len, hdr); iwlagn_tx_cmd_build_rate(priv, tx_cmd, info, fc); iwl_update_stats(priv, true, fc, len); memset(&info->status, 0, sizeof(info->status)); info->driver_data[0] = ctx; info->driver_data[1] = dev_cmd; spin_lock(&priv->sta_lock); if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc)) { u8 *qc = NULL; struct iwl_tid_data *tid_data; qc = ieee80211_get_qos_ctl(hdr); tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK; if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT)) goto drop_unlock_sta; tid_data = &priv->tid_data[sta_id][tid]; /* aggregation is on for this */ if (info->flags & IEEE80211_TX_CTL_AMPDU && tid_data->agg.state != IWL_AGG_ON) { IWL_ERR(priv, "TX_CTL_AMPDU while not in AGG:" " Tx flags = 0x%08x, agg.state = %d", info->flags, tid_data->agg.state); IWL_ERR(priv, "sta_id = %d, tid = %d seq_num = %d", sta_id, tid, SEQ_TO_SN(tid_data->seq_number)); goto drop_unlock_sta; } /* We can receive packets from the stack in IWL_AGG_{ON,OFF} * only. Check this here. */ if (WARN_ONCE(tid_data->agg.state != IWL_AGG_ON && tid_data->agg.state != IWL_AGG_OFF, "Tx while agg.state = %d", tid_data->agg.state)) goto drop_unlock_sta; seq_number = tid_data->seq_number; seq_number &= IEEE80211_SCTL_SEQ; hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG); hdr->seq_ctrl |= cpu_to_le16(seq_number); seq_number += 0x10; } /* Copy MAC header from skb into command buffer */ memcpy(tx_cmd->hdr, hdr, hdr_len); if (is_agg) txq_id = priv->tid_data[sta_id][tid].agg.txq_id; else if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) { /* * Send this frame after DTIM -- there's a special queue * reserved for this for contexts that support AP mode. */ txq_id = ctx->mcast_queue; /* * The microcode will clear the more data * bit in the last frame it transmits. */ hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); } else if (info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) txq_id = IWL_AUX_QUEUE; else txq_id = ctx->ac_to_queue[skb_get_queue_mapping(skb)]; if (iwl_trans_tx(priv->trans, skb, dev_cmd, txq_id)) goto drop_unlock_sta; if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc) && !ieee80211_has_morefrags(fc)) priv->tid_data[sta_id][tid].seq_number = seq_number; spin_unlock(&priv->sta_lock); /* * Avoid atomic ops if it isn't an associated client. * Also, if this is a packet for aggregation, don't * increase the counter because the ucode will stop * aggregation queues when their respective station * goes to sleep. */ if (sta_priv && sta_priv->client && !is_agg) atomic_inc(&sta_priv->pending_frames); return 0; drop_unlock_sta: if (dev_cmd) kmem_cache_free(iwl_tx_cmd_pool, dev_cmd); spin_unlock(&priv->sta_lock); drop_unlock_priv: return -1; } static int iwlagn_alloc_agg_txq(struct iwl_priv *priv, int ac) { int q; for (q = IWLAGN_FIRST_AMPDU_QUEUE; q < priv->cfg->base_params->num_of_queues; q++) { if (!test_and_set_bit(q, priv->agg_q_alloc)) { priv->queue_to_ac[q] = ac; return q; } } return -ENOSPC; } static void iwlagn_dealloc_agg_txq(struct iwl_priv *priv, int q) { clear_bit(q, priv->agg_q_alloc); priv->queue_to_ac[q] = IWL_INVALID_AC; } int iwlagn_tx_agg_stop(struct iwl_priv *priv, struct ieee80211_vif *vif, struct ieee80211_sta *sta, u16 tid) { struct iwl_tid_data *tid_data; int sta_id, txq_id; sta_id = iwl_sta_id(sta); if (sta_id == IWL_INVALID_STATION) { IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid); return -ENXIO; } spin_lock_bh(&priv->sta_lock); tid_data = &priv->tid_data[sta_id][tid]; txq_id = priv->tid_data[sta_id][tid].agg.txq_id; switch (priv->tid_data[sta_id][tid].agg.state) { case IWL_EMPTYING_HW_QUEUE_ADDBA: /* * This can happen if the peer stops aggregation * again before we've had a chance to drain the * queue we selected previously, i.e. before the * session was really started completely. */ IWL_DEBUG_HT(priv, "AGG stop before setup done\n"); goto turn_off; case IWL_AGG_ON: break; default: IWL_WARN(priv, "Stopping AGG while state not ON " "or starting for %d on %d (%d)\n", sta_id, tid, priv->tid_data[sta_id][tid].agg.state); spin_unlock_bh(&priv->sta_lock); return 0; } tid_data->agg.ssn = SEQ_TO_SN(tid_data->seq_number); /* There are still packets for this RA / TID in the HW */ if (!test_bit(txq_id, priv->agg_q_alloc)) { IWL_DEBUG_TX_QUEUES(priv, "stopping AGG on STA/TID %d/%d but hwq %d not used\n", sta_id, tid, txq_id); } else if (tid_data->agg.ssn != tid_data->next_reclaimed) { IWL_DEBUG_TX_QUEUES(priv, "Can't proceed: ssn %d, " "next_recl = %d\n", tid_data->agg.ssn, tid_data->next_reclaimed); priv->tid_data[sta_id][tid].agg.state = IWL_EMPTYING_HW_QUEUE_DELBA; spin_unlock_bh(&priv->sta_lock); return 0; } IWL_DEBUG_TX_QUEUES(priv, "Can proceed: ssn = next_recl = %d\n", tid_data->agg.ssn); turn_off: priv->tid_data[sta_id][tid].agg.state = IWL_AGG_OFF; spin_unlock_bh(&priv->sta_lock); if (test_bit(txq_id, priv->agg_q_alloc)) { iwl_trans_tx_agg_disable(priv->trans, txq_id); iwlagn_dealloc_agg_txq(priv, txq_id); } ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid); return 0; } int iwlagn_tx_agg_start(struct iwl_priv *priv, struct ieee80211_vif *vif, struct ieee80211_sta *sta, u16 tid, u16 *ssn) { struct iwl_tid_data *tid_data; int sta_id, txq_id, ret; IWL_DEBUG_HT(priv, "TX AGG request on ra = %pM tid = %d\n", sta->addr, tid); sta_id = iwl_sta_id(sta); if (sta_id == IWL_INVALID_STATION) { IWL_ERR(priv, "Start AGG on invalid station\n"); return -ENXIO; } if (unlikely(tid >= IWL_MAX_TID_COUNT)) return -EINVAL; if (priv->tid_data[sta_id][tid].agg.state != IWL_AGG_OFF) { IWL_ERR(priv, "Start AGG when state is not IWL_AGG_OFF !\n"); return -ENXIO; } txq_id = iwlagn_alloc_agg_txq(priv, tid_to_ac[tid]); if (txq_id < 0) { IWL_DEBUG_TX_QUEUES(priv, "No free aggregation queue for %pM/%d\n", sta->addr, tid); return txq_id; } ret = iwl_sta_tx_modify_enable_tid(priv, sta_id, tid); if (ret) return ret; spin_lock_bh(&priv->sta_lock); tid_data = &priv->tid_data[sta_id][tid]; tid_data->agg.ssn = SEQ_TO_SN(tid_data->seq_number); tid_data->agg.txq_id = txq_id; *ssn = tid_data->agg.ssn; if (*ssn == tid_data->next_reclaimed) { IWL_DEBUG_TX_QUEUES(priv, "Can proceed: ssn = next_recl = %d\n", tid_data->agg.ssn); tid_data->agg.state = IWL_AGG_ON; ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid); } else { IWL_DEBUG_TX_QUEUES(priv, "Can't proceed: ssn %d, " "next_reclaimed = %d\n", tid_data->agg.ssn, tid_data->next_reclaimed); tid_data->agg.state = IWL_EMPTYING_HW_QUEUE_ADDBA; } spin_unlock_bh(&priv->sta_lock); return ret; } int iwlagn_tx_agg_oper(struct iwl_priv *priv, struct ieee80211_vif *vif, struct ieee80211_sta *sta, u16 tid, u8 buf_size) { struct iwl_station_priv *sta_priv = (void *) sta->drv_priv; struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif); int q, fifo; u16 ssn; buf_size = min_t(int, buf_size, LINK_QUAL_AGG_FRAME_LIMIT_DEF); spin_lock_bh(&priv->sta_lock); ssn = priv->tid_data[sta_priv->sta_id][tid].agg.ssn; q = priv->tid_data[sta_priv->sta_id][tid].agg.txq_id; spin_unlock_bh(&priv->sta_lock); fifo = ctx->ac_to_fifo[tid_to_ac[tid]]; iwl_trans_tx_agg_setup(priv->trans, q, fifo, sta_priv->sta_id, tid, buf_size, ssn); /* * If the limit is 0, then it wasn't initialised yet, * use the default. We can do that since we take the * minimum below, and we don't want to go above our * default due to hardware restrictions. */ if (sta_priv->max_agg_bufsize == 0) sta_priv->max_agg_bufsize = LINK_QUAL_AGG_FRAME_LIMIT_DEF; /* * Even though in theory the peer could have different * aggregation reorder buffer sizes for different sessions, * our ucode doesn't allow for that and has a global limit * for each station. Therefore, use the minimum of all the * aggregation sessions and our default value. */ sta_priv->max_agg_bufsize = min(sta_priv->max_agg_bufsize, buf_size); if (priv->hw_params.use_rts_for_aggregation) { /* * switch to RTS/CTS if it is the prefer protection * method for HT traffic */ sta_priv->lq_sta.lq.general_params.flags |= LINK_QUAL_FLAGS_SET_STA_TLC_RTS_MSK; } priv->agg_tids_count++; IWL_DEBUG_HT(priv, "priv->agg_tids_count = %u\n", priv->agg_tids_count); sta_priv->lq_sta.lq.agg_params.agg_frame_cnt_limit = sta_priv->max_agg_bufsize; IWL_DEBUG_HT(priv, "Tx aggregation enabled on ra = %pM tid = %d\n", sta->addr, tid); return iwl_send_lq_cmd(priv, ctx, &sta_priv->lq_sta.lq, CMD_ASYNC, false); } static void iwlagn_check_ratid_empty(struct iwl_priv *priv, int sta_id, u8 tid) { struct iwl_tid_data *tid_data = &priv->tid_data[sta_id][tid]; enum iwl_rxon_context_id ctx; struct ieee80211_vif *vif; u8 *addr; lockdep_assert_held(&priv->sta_lock); addr = priv->stations[sta_id].sta.sta.addr; ctx = priv->stations[sta_id].ctxid; vif = priv->contexts[ctx].vif; switch (priv->tid_data[sta_id][tid].agg.state) { case IWL_EMPTYING_HW_QUEUE_DELBA: /* There are no packets for this RA / TID in the HW any more */ if (tid_data->agg.ssn == tid_data->next_reclaimed) { IWL_DEBUG_TX_QUEUES(priv, "Can continue DELBA flow ssn = next_recl =" " %d", tid_data->next_reclaimed); iwl_trans_tx_agg_disable(priv->trans, tid_data->agg.txq_id); iwlagn_dealloc_agg_txq(priv, tid_data->agg.txq_id); tid_data->agg.state = IWL_AGG_OFF; ieee80211_stop_tx_ba_cb_irqsafe(vif, addr, tid); } break; case IWL_EMPTYING_HW_QUEUE_ADDBA: /* There are no packets for this RA / TID in the HW any more */ if (tid_data->agg.ssn == tid_data->next_reclaimed) { IWL_DEBUG_TX_QUEUES(priv, "Can continue ADDBA flow ssn = next_recl =" " %d", tid_data->next_reclaimed); tid_data->agg.state = IWL_AGG_ON; ieee80211_start_tx_ba_cb_irqsafe(vif, addr, tid); } break; default: break; } } static void iwlagn_non_agg_tx_status(struct iwl_priv *priv, struct iwl_rxon_context *ctx, const u8 *addr1) { struct ieee80211_sta *sta; struct iwl_station_priv *sta_priv; rcu_read_lock(); sta = ieee80211_find_sta(ctx->vif, addr1); if (sta) { sta_priv = (void *)sta->drv_priv; /* avoid atomic ops if this isn't a client */ if (sta_priv->client && atomic_dec_return(&sta_priv->pending_frames) == 0) ieee80211_sta_block_awake(priv->hw, sta, false); } rcu_read_unlock(); } /** * translate ucode response to mac80211 tx status control values */ static void iwlagn_hwrate_to_tx_control(struct iwl_priv *priv, u32 rate_n_flags, struct ieee80211_tx_info *info) { struct ieee80211_tx_rate *r = &info->status.rates[0]; info->status.antenna = ((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS); if (rate_n_flags & RATE_MCS_HT_MSK) r->flags |= IEEE80211_TX_RC_MCS; if (rate_n_flags & RATE_MCS_GF_MSK) r->flags |= IEEE80211_TX_RC_GREEN_FIELD; if (rate_n_flags & RATE_MCS_HT40_MSK) r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; if (rate_n_flags & RATE_MCS_DUP_MSK) r->flags |= IEEE80211_TX_RC_DUP_DATA; if (rate_n_flags & RATE_MCS_SGI_MSK) r->flags |= IEEE80211_TX_RC_SHORT_GI; r->idx = iwlagn_hwrate_to_mac80211_idx(rate_n_flags, info->band); } #ifdef CONFIG_IWLWIFI_DEBUG const char *iwl_get_tx_fail_reason(u32 status) { #define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x #define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x switch (status & TX_STATUS_MSK) { case TX_STATUS_SUCCESS: return "SUCCESS"; TX_STATUS_POSTPONE(DELAY); TX_STATUS_POSTPONE(FEW_BYTES); TX_STATUS_POSTPONE(BT_PRIO); TX_STATUS_POSTPONE(QUIET_PERIOD); TX_STATUS_POSTPONE(CALC_TTAK); TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY); TX_STATUS_FAIL(SHORT_LIMIT); TX_STATUS_FAIL(LONG_LIMIT); TX_STATUS_FAIL(FIFO_UNDERRUN); TX_STATUS_FAIL(DRAIN_FLOW); TX_STATUS_FAIL(RFKILL_FLUSH); TX_STATUS_FAIL(LIFE_EXPIRE); TX_STATUS_FAIL(DEST_PS); TX_STATUS_FAIL(HOST_ABORTED); TX_STATUS_FAIL(BT_RETRY); TX_STATUS_FAIL(STA_INVALID); TX_STATUS_FAIL(FRAG_DROPPED); TX_STATUS_FAIL(TID_DISABLE); TX_STATUS_FAIL(FIFO_FLUSHED); TX_STATUS_FAIL(INSUFFICIENT_CF_POLL); TX_STATUS_FAIL(PASSIVE_NO_RX); TX_STATUS_FAIL(NO_BEACON_ON_RADAR); } return "UNKNOWN"; #undef TX_STATUS_FAIL #undef TX_STATUS_POSTPONE } #endif /* CONFIG_IWLWIFI_DEBUG */ static void iwlagn_count_agg_tx_err_status(struct iwl_priv *priv, u16 status) { status &= AGG_TX_STATUS_MSK; switch (status) { case AGG_TX_STATE_UNDERRUN_MSK: priv->reply_agg_tx_stats.underrun++; break; case AGG_TX_STATE_BT_PRIO_MSK: priv->reply_agg_tx_stats.bt_prio++; break; case AGG_TX_STATE_FEW_BYTES_MSK: priv->reply_agg_tx_stats.few_bytes++; break; case AGG_TX_STATE_ABORT_MSK: priv->reply_agg_tx_stats.abort++; break; case AGG_TX_STATE_LAST_SENT_TTL_MSK: priv->reply_agg_tx_stats.last_sent_ttl++; break; case AGG_TX_STATE_LAST_SENT_TRY_CNT_MSK: priv->reply_agg_tx_stats.last_sent_try++; break; case AGG_TX_STATE_LAST_SENT_BT_KILL_MSK: priv->reply_agg_tx_stats.last_sent_bt_kill++; break; case AGG_TX_STATE_SCD_QUERY_MSK: priv->reply_agg_tx_stats.scd_query++; break; case AGG_TX_STATE_TEST_BAD_CRC32_MSK: priv->reply_agg_tx_stats.bad_crc32++; break; case AGG_TX_STATE_RESPONSE_MSK: priv->reply_agg_tx_stats.response++; break; case AGG_TX_STATE_DUMP_TX_MSK: priv->reply_agg_tx_stats.dump_tx++; break; case AGG_TX_STATE_DELAY_TX_MSK: priv->reply_agg_tx_stats.delay_tx++; break; default: priv->reply_agg_tx_stats.unknown++; break; } } static void iwl_rx_reply_tx_agg(struct iwl_priv *priv, struct iwlagn_tx_resp *tx_resp) { struct agg_tx_status *frame_status = &tx_resp->status; int tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >> IWLAGN_TX_RES_TID_POS; int sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >> IWLAGN_TX_RES_RA_POS; struct iwl_ht_agg *agg = &priv->tid_data[sta_id][tid].agg; u32 status = le16_to_cpu(tx_resp->status.status); int i; WARN_ON(tid == IWL_TID_NON_QOS); if (agg->wait_for_ba) IWL_DEBUG_TX_REPLY(priv, "got tx response w/o block-ack\n"); agg->rate_n_flags = le32_to_cpu(tx_resp->rate_n_flags); agg->wait_for_ba = (tx_resp->frame_count > 1); /* * If the BT kill count is non-zero, we'll get this * notification again. */ if (tx_resp->bt_kill_count && tx_resp->frame_count == 1 && priv->cfg->bt_params && priv->cfg->bt_params->advanced_bt_coexist) { IWL_DEBUG_COEX(priv, "receive reply tx w/ bt_kill\n"); } if (tx_resp->frame_count == 1) return; /* Construct bit-map of pending frames within Tx window */ for (i = 0; i < tx_resp->frame_count; i++) { u16 fstatus = le16_to_cpu(frame_status[i].status); if (status & AGG_TX_STATUS_MSK) iwlagn_count_agg_tx_err_status(priv, fstatus); if (status & (AGG_TX_STATE_FEW_BYTES_MSK | AGG_TX_STATE_ABORT_MSK)) continue; IWL_DEBUG_TX_REPLY(priv, "status %s (0x%08x), " "try-count (0x%08x)\n", iwl_get_agg_tx_fail_reason(fstatus), fstatus & AGG_TX_STATUS_MSK, fstatus & AGG_TX_TRY_MSK); } } #ifdef CONFIG_IWLWIFI_DEBUG #define AGG_TX_STATE_FAIL(x) case AGG_TX_STATE_ ## x: return #x const char *iwl_get_agg_tx_fail_reason(u16 status) { status &= AGG_TX_STATUS_MSK; switch (status) { case AGG_TX_STATE_TRANSMITTED: return "SUCCESS"; AGG_TX_STATE_FAIL(UNDERRUN_MSK); AGG_TX_STATE_FAIL(BT_PRIO_MSK); AGG_TX_STATE_FAIL(FEW_BYTES_MSK); AGG_TX_STATE_FAIL(ABORT_MSK); AGG_TX_STATE_FAIL(LAST_SENT_TTL_MSK); AGG_TX_STATE_FAIL(LAST_SENT_TRY_CNT_MSK); AGG_TX_STATE_FAIL(LAST_SENT_BT_KILL_MSK); AGG_TX_STATE_FAIL(SCD_QUERY_MSK); AGG_TX_STATE_FAIL(TEST_BAD_CRC32_MSK); AGG_TX_STATE_FAIL(RESPONSE_MSK); AGG_TX_STATE_FAIL(DUMP_TX_MSK); AGG_TX_STATE_FAIL(DELAY_TX_MSK); } return "UNKNOWN"; } #endif /* CONFIG_IWLWIFI_DEBUG */ static inline u32 iwlagn_get_scd_ssn(struct iwlagn_tx_resp *tx_resp) { return le32_to_cpup((__le32 *)&tx_resp->status + tx_resp->frame_count) & MAX_SN; } static void iwlagn_count_tx_err_status(struct iwl_priv *priv, u16 status) { status &= TX_STATUS_MSK; switch (status) { case TX_STATUS_POSTPONE_DELAY: priv->reply_tx_stats.pp_delay++; break; case TX_STATUS_POSTPONE_FEW_BYTES: priv->reply_tx_stats.pp_few_bytes++; break; case TX_STATUS_POSTPONE_BT_PRIO: priv->reply_tx_stats.pp_bt_prio++; break; case TX_STATUS_POSTPONE_QUIET_PERIOD: priv->reply_tx_stats.pp_quiet_period++; break; case TX_STATUS_POSTPONE_CALC_TTAK: priv->reply_tx_stats.pp_calc_ttak++; break; case TX_STATUS_FAIL_INTERNAL_CROSSED_RETRY: priv->reply_tx_stats.int_crossed_retry++; break; case TX_STATUS_FAIL_SHORT_LIMIT: priv->reply_tx_stats.short_limit++; break; case TX_STATUS_FAIL_LONG_LIMIT: priv->reply_tx_stats.long_limit++; break; case TX_STATUS_FAIL_FIFO_UNDERRUN: priv->reply_tx_stats.fifo_underrun++; break; case TX_STATUS_FAIL_DRAIN_FLOW: priv->reply_tx_stats.drain_flow++; break; case TX_STATUS_FAIL_RFKILL_FLUSH: priv->reply_tx_stats.rfkill_flush++; break; case TX_STATUS_FAIL_LIFE_EXPIRE: priv->reply_tx_stats.life_expire++; break; case TX_STATUS_FAIL_DEST_PS: priv->reply_tx_stats.dest_ps++; break; case TX_STATUS_FAIL_HOST_ABORTED: priv->reply_tx_stats.host_abort++; break; case TX_STATUS_FAIL_BT_RETRY: priv->reply_tx_stats.bt_retry++; break; case TX_STATUS_FAIL_STA_INVALID: priv->reply_tx_stats.sta_invalid++; break; case TX_STATUS_FAIL_FRAG_DROPPED: priv->reply_tx_stats.frag_drop++; break; case TX_STATUS_FAIL_TID_DISABLE: priv->reply_tx_stats.tid_disable++; break; case TX_STATUS_FAIL_FIFO_FLUSHED: priv->reply_tx_stats.fifo_flush++; break; case TX_STATUS_FAIL_INSUFFICIENT_CF_POLL: priv->reply_tx_stats.insuff_cf_poll++; break; case TX_STATUS_FAIL_PASSIVE_NO_RX: priv->reply_tx_stats.fail_hw_drop++; break; case TX_STATUS_FAIL_NO_BEACON_ON_RADAR: priv->reply_tx_stats.sta_color_mismatch++; break; default: priv->reply_tx_stats.unknown++; break; } } static void iwlagn_set_tx_status(struct iwl_priv *priv, struct ieee80211_tx_info *info, struct iwlagn_tx_resp *tx_resp, bool is_agg) { u16 status = le16_to_cpu(tx_resp->status.status); info->status.rates[0].count = tx_resp->failure_frame + 1; if (is_agg) info->flags &= ~IEEE80211_TX_CTL_AMPDU; info->flags |= iwl_tx_status_to_mac80211(status); iwlagn_hwrate_to_tx_control(priv, le32_to_cpu(tx_resp->rate_n_flags), info); if (!iwl_is_tx_success(status)) iwlagn_count_tx_err_status(priv, status); } static void iwl_check_abort_status(struct iwl_priv *priv, u8 frame_count, u32 status) { if (frame_count == 1 && status == TX_STATUS_FAIL_RFKILL_FLUSH) { IWL_ERR(priv, "Tx flush command to flush out all frames\n"); if (!test_bit(STATUS_EXIT_PENDING, &priv->status)) queue_work(priv->workqueue, &priv->tx_flush); } } static int iwl_reclaim(struct iwl_priv *priv, int sta_id, int tid, int txq_id, int ssn, struct sk_buff_head *skbs) { if (unlikely(txq_id >= IWLAGN_FIRST_AMPDU_QUEUE && tid != IWL_TID_NON_QOS && txq_id != priv->tid_data[sta_id][tid].agg.txq_id)) { /* * FIXME: this is a uCode bug which need to be addressed, * log the information and return for now. * Since it is can possibly happen very often and in order * not to fill the syslog, don't use IWL_ERR or IWL_WARN */ IWL_DEBUG_TX_QUEUES(priv, "Bad queue mapping txq_id=%d, agg_txq[sta:%d,tid:%d]=%d\n", txq_id, sta_id, tid, priv->tid_data[sta_id][tid].agg.txq_id); return 1; } iwl_trans_reclaim(priv->trans, txq_id, ssn, skbs); return 0; } int iwlagn_rx_reply_tx(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb, struct iwl_device_cmd *cmd) { struct iwl_rx_packet *pkt = rxb_addr(rxb); u16 sequence = le16_to_cpu(pkt->hdr.sequence); int txq_id = SEQ_TO_QUEUE(sequence); int cmd_index __maybe_unused = SEQ_TO_INDEX(sequence); struct iwlagn_tx_resp *tx_resp = (void *)pkt->data; struct ieee80211_hdr *hdr; u32 status = le16_to_cpu(tx_resp->status.status); u16 ssn = iwlagn_get_scd_ssn(tx_resp); int tid; int sta_id; int freed; struct ieee80211_tx_info *info; struct sk_buff_head skbs; struct sk_buff *skb; struct iwl_rxon_context *ctx; bool is_agg = (txq_id >= IWLAGN_FIRST_AMPDU_QUEUE); tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >> IWLAGN_TX_RES_TID_POS; sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >> IWLAGN_TX_RES_RA_POS; spin_lock(&priv->sta_lock); if (is_agg) iwl_rx_reply_tx_agg(priv, tx_resp); __skb_queue_head_init(&skbs); if (tx_resp->frame_count == 1) { u16 next_reclaimed = le16_to_cpu(tx_resp->seq_ctl); next_reclaimed = SEQ_TO_SN(next_reclaimed + 0x10); if (is_agg) { /* If this is an aggregation queue, we can rely on the * ssn since the wifi sequence number corresponds to * the index in the TFD ring (%256). * The seq_ctl is the sequence control of the packet * to which this Tx response relates. But if there is a * hole in the bitmap of the BA we received, this Tx * response may allow to reclaim the hole and all the * subsequent packets that were already acked. * In that case, seq_ctl != ssn, and the next packet * to be reclaimed will be ssn and not seq_ctl. */ next_reclaimed = ssn; } if (tid != IWL_TID_NON_QOS) { priv->tid_data[sta_id][tid].next_reclaimed = next_reclaimed; IWL_DEBUG_TX_REPLY(priv, "Next reclaimed packet:%d\n", next_reclaimed); } /*we can free until ssn % q.n_bd not inclusive */ WARN_ON(iwl_reclaim(priv, sta_id, tid, txq_id, ssn, &skbs)); iwlagn_check_ratid_empty(priv, sta_id, tid); freed = 0; /* process frames */ skb_queue_walk(&skbs, skb) { hdr = (struct ieee80211_hdr *)skb->data; if (!ieee80211_is_data_qos(hdr->frame_control)) priv->last_seq_ctl = tx_resp->seq_ctl; info = IEEE80211_SKB_CB(skb); ctx = info->driver_data[0]; kmem_cache_free(iwl_tx_cmd_pool, (info->driver_data[1])); memset(&info->status, 0, sizeof(info->status)); if (status == TX_STATUS_FAIL_PASSIVE_NO_RX && iwl_is_associated_ctx(ctx) && ctx->vif && ctx->vif->type == NL80211_IFTYPE_STATION) { /* block and stop all queues */ priv->passive_no_rx = true; IWL_DEBUG_TX_QUEUES(priv, "stop all queues: " "passive channel"); ieee80211_stop_queues(priv->hw); IWL_DEBUG_TX_REPLY(priv, "TXQ %d status %s (0x%08x) " "rate_n_flags 0x%x retries %d\n", txq_id, iwl_get_tx_fail_reason(status), status, le32_to_cpu(tx_resp->rate_n_flags), tx_resp->failure_frame); IWL_DEBUG_TX_REPLY(priv, "FrameCnt = %d, idx=%d\n", tx_resp->frame_count, cmd_index); } /* check if BAR is needed */ if (is_agg && !iwl_is_tx_success(status)) info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK; iwlagn_set_tx_status(priv, IEEE80211_SKB_CB(skb), tx_resp, is_agg); if (!is_agg) iwlagn_non_agg_tx_status(priv, ctx, hdr->addr1); freed++; } WARN_ON(!is_agg && freed != 1); } iwl_check_abort_status(priv, tx_resp->frame_count, status); spin_unlock(&priv->sta_lock); while (!skb_queue_empty(&skbs)) { skb = __skb_dequeue(&skbs); ieee80211_tx_status(priv->hw, skb); } return 0; } /** * iwlagn_rx_reply_compressed_ba - Handler for REPLY_COMPRESSED_BA * * Handles block-acknowledge notification from device, which reports success * of frames sent via aggregation. */ int iwlagn_rx_reply_compressed_ba(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb, struct iwl_device_cmd *cmd) { struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwl_compressed_ba_resp *ba_resp = (void *)pkt->data; struct iwl_ht_agg *agg; struct sk_buff_head reclaimed_skbs; struct ieee80211_tx_info *info; struct ieee80211_hdr *hdr; struct sk_buff *skb; int sta_id; int tid; int freed; /* "flow" corresponds to Tx queue */ u16 scd_flow = le16_to_cpu(ba_resp->scd_flow); /* "ssn" is start of block-ack Tx window, corresponds to index * (in Tx queue's circular buffer) of first TFD/frame in window */ u16 ba_resp_scd_ssn = le16_to_cpu(ba_resp->scd_ssn); if (scd_flow >= priv->cfg->base_params->num_of_queues) { IWL_ERR(priv, "BUG_ON scd_flow is bigger than number of queues\n"); return 0; } sta_id = ba_resp->sta_id; tid = ba_resp->tid; agg = &priv->tid_data[sta_id][tid].agg; spin_lock(&priv->sta_lock); if (unlikely(!agg->wait_for_ba)) { if (unlikely(ba_resp->bitmap)) IWL_ERR(priv, "Received BA when not expected\n"); spin_unlock(&priv->sta_lock); return 0; } __skb_queue_head_init(&reclaimed_skbs); /* Release all TFDs before the SSN, i.e. all TFDs in front of * block-ack window (we assume that they've been successfully * transmitted ... if not, it's too late anyway). */ if (iwl_reclaim(priv, sta_id, tid, scd_flow, ba_resp_scd_ssn, &reclaimed_skbs)) { spin_unlock(&priv->sta_lock); return 0; } IWL_DEBUG_TX_REPLY(priv, "REPLY_COMPRESSED_BA [%d] Received from %pM, " "sta_id = %d\n", agg->wait_for_ba, (u8 *) &ba_resp->sta_addr_lo32, ba_resp->sta_id); IWL_DEBUG_TX_REPLY(priv, "TID = %d, SeqCtl = %d, bitmap = 0x%llx, " "scd_flow = %d, scd_ssn = %d\n", ba_resp->tid, le16_to_cpu(ba_resp->seq_ctl), (unsigned long long)le64_to_cpu(ba_resp->bitmap), scd_flow, ba_resp_scd_ssn); /* Mark that the expected block-ack response arrived */ agg->wait_for_ba = false; /* Sanity check values reported by uCode */ if (ba_resp->txed_2_done > ba_resp->txed) { IWL_DEBUG_TX_REPLY(priv, "bogus sent(%d) and ack(%d) count\n", ba_resp->txed, ba_resp->txed_2_done); /* * set txed_2_done = txed, * so it won't impact rate scale */ ba_resp->txed = ba_resp->txed_2_done; } IWL_DEBUG_HT(priv, "agg frames sent:%d, acked:%d\n", ba_resp->txed, ba_resp->txed_2_done); priv->tid_data[sta_id][tid].next_reclaimed = ba_resp_scd_ssn; iwlagn_check_ratid_empty(priv, sta_id, tid); freed = 0; skb_queue_walk(&reclaimed_skbs, skb) { hdr = (struct ieee80211_hdr *)skb->data; if (ieee80211_is_data_qos(hdr->frame_control)) freed++; else WARN_ON_ONCE(1); info = IEEE80211_SKB_CB(skb); kmem_cache_free(iwl_tx_cmd_pool, (info->driver_data[1])); if (freed == 1) { /* this is the first skb we deliver in this batch */ /* put the rate scaling data there */ info = IEEE80211_SKB_CB(skb); memset(&info->status, 0, sizeof(info->status)); info->flags |= IEEE80211_TX_STAT_ACK; info->flags |= IEEE80211_TX_STAT_AMPDU; info->status.ampdu_ack_len = ba_resp->txed_2_done; info->status.ampdu_len = ba_resp->txed; iwlagn_hwrate_to_tx_control(priv, agg->rate_n_flags, info); } } spin_unlock(&priv->sta_lock); while (!skb_queue_empty(&reclaimed_skbs)) { skb = __skb_dequeue(&reclaimed_skbs); ieee80211_tx_status(priv->hw, skb); } return 0; }