| /****************************************************************************** |
| * |
| * 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 <ilw@linux.intel.com> |
| * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 |
| * |
| *****************************************************************************/ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/sched.h> |
| |
| #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 <sta,tid> */ |
| 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 */ |