/****************************************************************************** * * GPL LICENSE SUMMARY * * Copyright(c) 2008 - 2011 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 "iwl-dev.h" #include "iwl-core.h" #include "iwl-sta.h" #include "iwl-io.h" #include "iwl-helpers.h" #include "iwl-agn-hw.h" #include "iwl-agn.h" #include "iwl-trans.h" /* * mac80211 queues, ACs, hardware queues, FIFOs. * * Cf. http://wireless.kernel.org/en/developers/Documentation/mac80211/queues * * Mac80211 uses the following numbers, which we get as from it * by way of skb_get_queue_mapping(skb): * * VO 0 * VI 1 * BE 2 * BK 3 * * * Regular (not A-MPDU) frames are put into hardware queues corresponding * to the FIFOs, see comments in iwl-prph.h. Aggregated frames get their * own queue per aggregation session (RA/TID combination), such queues are * set up to map into FIFOs too, for which we need an AC->FIFO mapping. In * order to map frames to the right queue, we also need an AC->hw queue * mapping. This is implemented here. * * Due to the way hw queues are set up (by the hw specific modules like * iwl-4965.c, iwl-5000.c etc.), the AC->hw queue mapping is the identity * mapping. */ 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 inline int get_ac_from_tid(u16 tid) { if (likely(tid < ARRAY_SIZE(tid_to_ac))) return tid_to_ac[tid]; /* no support for TIDs 8-15 yet */ return -EINVAL; } static inline int get_fifo_from_tid(struct iwl_rxon_context *ctx, u16 tid) { if (likely(tid < ARRAY_SIZE(tid_to_ac))) return ctx->ac_to_fifo[tid_to_ac[tid]]; /* no support for TIDs 8-15 yet */ return -EINVAL; } static int iwlagn_txq_agg_enable(struct iwl_priv *priv, int txq_id, int sta_id, int tid) { if ((IWLAGN_FIRST_AMPDU_QUEUE > txq_id) || (IWLAGN_FIRST_AMPDU_QUEUE + priv->cfg->base_params->num_of_ampdu_queues <= txq_id)) { IWL_WARN(priv, "queue number out of range: %d, must be %d to %d\n", txq_id, IWLAGN_FIRST_AMPDU_QUEUE, IWLAGN_FIRST_AMPDU_QUEUE + priv->cfg->base_params->num_of_ampdu_queues - 1); return -EINVAL; } /* Modify device's station table to Tx this TID */ return iwl_sta_tx_modify_enable_tid(priv, sta_id, tid); } 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 std_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 = std_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_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; } #define RTS_DFAULT_RETRY_LIMIT 60 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; /* Set retry limit on DATA packets and Probe Responses*/ if (ieee80211_is_probe_resp(fc)) data_retry_limit = 3; else data_retry_limit = IWLAGN_DEFAULT_TX_RETRY; tx_cmd->data_retry_limit = data_retry_limit; /* Set retry limit on RTS packets */ rts_retry_limit = RTS_DFAULT_RETRY_LIMIT; if (data_retry_limit < rts_retry_limit) rts_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_SVTOOL 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; } /** * 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, int sta_id) { 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; } } /* * 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_tx_cmd *tx_cmd; int txq_id; u16 seq_number = 0; __le16 fc; u8 hdr_len; u16 len; u8 sta_id; u8 tid = 0; unsigned long flags; bool is_agg = false; /* * If the frame needs to go out off-channel, then * we'll have put the PAN context to that channel, * so make the frame go out there. */ if (info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ctx = &priv->contexts[IWL_RXON_CTX_PAN]; else if (info->control.vif) ctx = iwl_rxon_ctx_from_vif(info->control.vif); spin_lock_irqsave(&priv->lock, flags); 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 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(priv, 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_PSPOLL_RESPONSE)) { /* * 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. */ iwl_sta_modify_sleep_tx_count(priv, sta_id, 1); } /* * Send this frame after DTIM -- there's a special queue * reserved for this for contexts that support AP mode. */ if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) { 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 txq_id = ctx->ac_to_queue[skb_get_queue_mapping(skb)]; /* irqs already disabled/saved above when locking priv->lock */ spin_lock(&priv->sta_lock); if (ieee80211_is_data_qos(fc)) { u8 *qc = NULL; qc = ieee80211_get_qos_ctl(hdr); tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK; if (WARN_ON_ONCE(tid >= MAX_TID_COUNT)) goto drop_unlock_sta; seq_number = priv->stations[sta_id].tid[tid].seq_number; seq_number &= IEEE80211_SCTL_SEQ; hdr->seq_ctrl = hdr->seq_ctrl & cpu_to_le16(IEEE80211_SCTL_FRAG); hdr->seq_ctrl |= cpu_to_le16(seq_number); seq_number += 0x10; /* aggregation is on for this */ if (info->flags & IEEE80211_TX_CTL_AMPDU && priv->stations[sta_id].tid[tid].agg.state == IWL_AGG_ON) { txq_id = priv->stations[sta_id].tid[tid].agg.txq_id; is_agg = true; } } tx_cmd = trans_get_tx_cmd(&priv->trans, txq_id); if (unlikely(!tx_cmd)) goto drop_unlock_sta; /* Copy MAC header from skb into command buffer */ memcpy(tx_cmd->hdr, hdr, hdr_len); /* 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, sta_id); /* 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); if (trans_tx(&priv->trans, skb, tx_cmd, txq_id, fc, is_agg, ctx)) goto drop_unlock_sta; if (ieee80211_is_data_qos(fc)) { priv->stations[sta_id].tid[tid].tfds_in_queue++; if (!ieee80211_has_morefrags(fc)) priv->stations[sta_id].tid[tid].seq_number = seq_number; } spin_unlock(&priv->sta_lock); spin_unlock_irqrestore(&priv->lock, flags); /* * 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: spin_unlock(&priv->sta_lock); drop_unlock_priv: spin_unlock_irqrestore(&priv->lock, flags); return -1; } /* * Find first available (lowest unused) Tx Queue, mark it "active". * Called only when finding queue for aggregation. * Should never return anything < 7, because they should already * be in use as EDCA AC (0-3), Command (4), reserved (5, 6) */ static int iwlagn_txq_ctx_activate_free(struct iwl_priv *priv) { int txq_id; for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++) if (!test_and_set_bit(txq_id, &priv->txq_ctx_active_msk)) return txq_id; return -1; } int iwlagn_tx_agg_start(struct iwl_priv *priv, struct ieee80211_vif *vif, struct ieee80211_sta *sta, u16 tid, u16 *ssn) { int sta_id; int tx_fifo; int txq_id; int ret; unsigned long flags; struct iwl_tid_data *tid_data; tx_fifo = get_fifo_from_tid(iwl_rxon_ctx_from_vif(vif), tid); if (unlikely(tx_fifo < 0)) return tx_fifo; 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 >= MAX_TID_COUNT)) return -EINVAL; if (priv->stations[sta_id].tid[tid].agg.state != IWL_AGG_OFF) { IWL_ERR(priv, "Start AGG when state is not IWL_AGG_OFF !\n"); return -ENXIO; } txq_id = iwlagn_txq_ctx_activate_free(priv); if (txq_id == -1) { IWL_ERR(priv, "No free aggregation queue available\n"); return -ENXIO; } spin_lock_irqsave(&priv->sta_lock, flags); tid_data = &priv->stations[sta_id].tid[tid]; *ssn = SEQ_TO_SN(tid_data->seq_number); tid_data->agg.txq_id = txq_id; tid_data->agg.tx_fifo = tx_fifo; iwl_set_swq_id(&priv->txq[txq_id], get_ac_from_tid(tid), txq_id); spin_unlock_irqrestore(&priv->sta_lock, flags); ret = iwlagn_txq_agg_enable(priv, txq_id, sta_id, tid); if (ret) return ret; spin_lock_irqsave(&priv->sta_lock, flags); tid_data = &priv->stations[sta_id].tid[tid]; if (tid_data->tfds_in_queue == 0) { IWL_DEBUG_HT(priv, "HW queue is empty\n"); tid_data->agg.state = IWL_AGG_ON; ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid); } else { IWL_DEBUG_HT(priv, "HW queue is NOT empty: %d packets in HW queue\n", tid_data->tfds_in_queue); tid_data->agg.state = IWL_EMPTYING_HW_QUEUE_ADDBA; } spin_unlock_irqrestore(&priv->sta_lock, flags); return ret; } int iwlagn_tx_agg_stop(struct iwl_priv *priv, struct ieee80211_vif *vif, struct ieee80211_sta *sta, u16 tid) { int tx_fifo_id, txq_id, sta_id, ssn; struct iwl_tid_data *tid_data; int write_ptr, read_ptr; unsigned long flags; tx_fifo_id = get_fifo_from_tid(iwl_rxon_ctx_from_vif(vif), tid); if (unlikely(tx_fifo_id < 0)) return tx_fifo_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_irqsave(&priv->sta_lock, flags); tid_data = &priv->stations[sta_id].tid[tid]; ssn = (tid_data->seq_number & IEEE80211_SCTL_SEQ) >> 4; txq_id = tid_data->agg.txq_id; switch (priv->stations[sta_id].tid[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\n"); } write_ptr = priv->txq[txq_id].q.write_ptr; read_ptr = priv->txq[txq_id].q.read_ptr; /* The queue is not empty */ if (write_ptr != read_ptr) { IWL_DEBUG_HT(priv, "Stopping a non empty AGG HW QUEUE\n"); priv->stations[sta_id].tid[tid].agg.state = IWL_EMPTYING_HW_QUEUE_DELBA; spin_unlock_irqrestore(&priv->sta_lock, flags); return 0; } IWL_DEBUG_HT(priv, "HW queue is empty\n"); turn_off: priv->stations[sta_id].tid[tid].agg.state = IWL_AGG_OFF; /* do not restore/save irqs */ spin_unlock(&priv->sta_lock); spin_lock(&priv->lock); /* * the only reason this call can fail is queue number out of range, * which can happen if uCode is reloaded and all the station * information are lost. if it is outside the range, there is no need * to deactivate the uCode queue, just return "success" to allow * mac80211 to clean up it own data. */ trans_txq_agg_disable(&priv->trans, txq_id, ssn, tx_fifo_id); spin_unlock_irqrestore(&priv->lock, flags); ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid); return 0; } int iwlagn_txq_check_empty(struct iwl_priv *priv, int sta_id, u8 tid, int txq_id) { struct iwl_queue *q = &priv->txq[txq_id].q; u8 *addr = priv->stations[sta_id].sta.sta.addr; struct iwl_tid_data *tid_data = &priv->stations[sta_id].tid[tid]; struct iwl_rxon_context *ctx; ctx = &priv->contexts[priv->stations[sta_id].ctxid]; lockdep_assert_held(&priv->sta_lock); switch (priv->stations[sta_id].tid[tid].agg.state) { case IWL_EMPTYING_HW_QUEUE_DELBA: /* We are reclaiming the last packet of the */ /* aggregated HW queue */ if ((txq_id == tid_data->agg.txq_id) && (q->read_ptr == q->write_ptr)) { u16 ssn = SEQ_TO_SN(tid_data->seq_number); int tx_fifo = get_fifo_from_tid(ctx, tid); IWL_DEBUG_HT(priv, "HW queue empty: continue DELBA flow\n"); trans_txq_agg_disable(&priv->trans, txq_id, ssn, tx_fifo); tid_data->agg.state = IWL_AGG_OFF; ieee80211_stop_tx_ba_cb_irqsafe(ctx->vif, addr, tid); } break; case IWL_EMPTYING_HW_QUEUE_ADDBA: /* We are reclaiming the last packet of the queue */ if (tid_data->tfds_in_queue == 0) { IWL_DEBUG_HT(priv, "HW queue empty: continue ADDBA flow\n"); tid_data->agg.state = IWL_AGG_ON; ieee80211_start_tx_ba_cb_irqsafe(ctx->vif, addr, tid); } break; } return 0; } 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(); } static void iwlagn_tx_status(struct iwl_priv *priv, struct iwl_tx_info *tx_info, bool is_agg) { struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx_info->skb->data; if (!is_agg) iwlagn_non_agg_tx_status(priv, tx_info->ctx, hdr->addr1); ieee80211_tx_status_irqsafe(priv->hw, tx_info->skb); } int iwlagn_tx_queue_reclaim(struct iwl_priv *priv, int txq_id, int index) { struct iwl_tx_queue *txq = &priv->txq[txq_id]; struct iwl_queue *q = &txq->q; struct iwl_tx_info *tx_info; int nfreed = 0; struct ieee80211_hdr *hdr; if ((index >= q->n_bd) || (iwl_queue_used(q, index) == 0)) { IWL_ERR(priv, "%s: Read index for DMA queue txq id (%d), " "index %d is out of range [0-%d] %d %d.\n", __func__, txq_id, index, q->n_bd, q->write_ptr, q->read_ptr); return 0; } for (index = iwl_queue_inc_wrap(index, q->n_bd); q->read_ptr != index; q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd)) { tx_info = &txq->txb[txq->q.read_ptr]; if (WARN_ON_ONCE(tx_info->skb == NULL)) continue; hdr = (struct ieee80211_hdr *)tx_info->skb->data; if (ieee80211_is_data_qos(hdr->frame_control)) nfreed++; iwlagn_tx_status(priv, tx_info, txq_id >= IWLAGN_FIRST_AMPDU_QUEUE); tx_info->skb = NULL; iwlagn_txq_inval_byte_cnt_tbl(priv, txq); iwlagn_txq_free_tfd(priv, txq, txq->q.read_ptr); } return nfreed; } /** * iwlagn_tx_status_reply_compressed_ba - Update tx status from block-ack * * Go through block-ack's bitmap of ACK'd frames, update driver's record of * ACK vs. not. This gets sent to mac80211, then to rate scaling algo. */ static int iwlagn_tx_status_reply_compressed_ba(struct iwl_priv *priv, struct iwl_ht_agg *agg, struct iwl_compressed_ba_resp *ba_resp) { int sh; u16 seq_ctl = le16_to_cpu(ba_resp->seq_ctl); u16 scd_flow = le16_to_cpu(ba_resp->scd_flow); struct ieee80211_tx_info *info; u64 bitmap, sent_bitmap; if (unlikely(!agg->wait_for_ba)) { if (unlikely(ba_resp->bitmap)) IWL_ERR(priv, "Received BA when not expected\n"); return -EINVAL; } /* Mark that the expected block-ack response arrived */ agg->wait_for_ba = 0; IWL_DEBUG_TX_REPLY(priv, "BA %d %d\n", agg->start_idx, ba_resp->seq_ctl); /* Calculate shift to align block-ack bits with our Tx window bits */ sh = agg->start_idx - SEQ_TO_INDEX(seq_ctl >> 4); if (sh < 0) sh += 0x100; /* * Check for success or failure according to the * transmitted bitmap and block-ack bitmap */ bitmap = le64_to_cpu(ba_resp->bitmap) >> sh; sent_bitmap = bitmap & agg->bitmap; /* 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); /* Find the first ACKed frame to store the TX status */ while (sent_bitmap && !(sent_bitmap & 1)) { agg->start_idx = (agg->start_idx + 1) & 0xff; sent_bitmap >>= 1; } info = IEEE80211_SKB_CB(priv->txq[scd_flow].txb[agg->start_idx].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); return 0; } /** * translate ucode response to mac80211 tx status control values */ 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->control.rates[0]; info->antenna_sel_tx = ((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); } /** * iwlagn_rx_reply_compressed_ba - Handler for REPLY_COMPRESSED_BA * * Handles block-acknowledge notification from device, which reports success * of frames sent via aggregation. */ void iwlagn_rx_reply_compressed_ba(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb) { struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwl_compressed_ba_resp *ba_resp = &pkt->u.compressed_ba; struct iwl_tx_queue *txq = NULL; struct iwl_ht_agg *agg; int index; int sta_id; int tid; unsigned long flags; /* "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->hw_params.max_txq_num) { IWL_ERR(priv, "BUG_ON scd_flow is bigger than number of queues\n"); return; } txq = &priv->txq[scd_flow]; sta_id = ba_resp->sta_id; tid = ba_resp->tid; agg = &priv->stations[sta_id].tid[tid].agg; if (unlikely(agg->txq_id != scd_flow)) { /* * FIXME: this is a uCode bug which need to be addressed, * log the information and return for now! * since it is possible happen very often and in order * not to fill the syslog, don't enable the logging by default */ IWL_DEBUG_TX_REPLY(priv, "BA scd_flow %d does not match txq_id %d\n", scd_flow, agg->txq_id); return; } /* Find index just before block-ack window */ index = iwl_queue_dec_wrap(ba_resp_scd_ssn & 0xff, txq->q.n_bd); spin_lock_irqsave(&priv->sta_lock, flags); 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, ba_resp->seq_ctl, (unsigned long long)le64_to_cpu(ba_resp->bitmap), ba_resp->scd_flow, ba_resp->scd_ssn); IWL_DEBUG_TX_REPLY(priv, "DAT start_idx = %d, bitmap = 0x%llx\n", agg->start_idx, (unsigned long long)agg->bitmap); /* Update driver's record of ACK vs. not for each frame in window */ iwlagn_tx_status_reply_compressed_ba(priv, agg, ba_resp); /* 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 (txq->q.read_ptr != (ba_resp_scd_ssn & 0xff)) { /* calculate mac80211 ampdu sw queue to wake */ int freed = iwlagn_tx_queue_reclaim(priv, scd_flow, index); iwl_free_tfds_in_queue(priv, sta_id, tid, freed); if ((iwl_queue_space(&txq->q) > txq->q.low_mark) && priv->mac80211_registered && (agg->state != IWL_EMPTYING_HW_QUEUE_DELBA)) iwl_wake_queue(priv, txq); iwlagn_txq_check_empty(priv, sta_id, tid, scd_flow); } spin_unlock_irqrestore(&priv->sta_lock, flags); } #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 */