diff options
Diffstat (limited to 'drivers/net/wireless/iwlwifi/mvm/tx.c')
| -rw-r--r-- | drivers/net/wireless/iwlwifi/mvm/tx.c | 916 |
1 files changed, 916 insertions, 0 deletions
diff --git a/drivers/net/wireless/iwlwifi/mvm/tx.c b/drivers/net/wireless/iwlwifi/mvm/tx.c new file mode 100644 index 00000000000..6b67ce3f679 --- /dev/null +++ b/drivers/net/wireless/iwlwifi/mvm/tx.c @@ -0,0 +1,916 @@ +/****************************************************************************** + * + * This file is provided under a dual BSD/GPLv2 license. When using or + * redistributing this file, you may do so under either license. + * + * GPL LICENSE SUMMARY + * + * Copyright(c) 2012 - 2013 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 + * + * BSD LICENSE + * + * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + *****************************************************************************/ +#include <linux/ieee80211.h> +#include <linux/etherdevice.h> + +#include "iwl-trans.h" +#include "iwl-eeprom-parse.h" +#include "mvm.h" +#include "sta.h" + +/* + * Sets most of the Tx cmd's fields + */ +static void iwl_mvm_set_tx_cmd(struct iwl_mvm *mvm, struct sk_buff *skb, + struct iwl_tx_cmd *tx_cmd, + struct ieee80211_tx_info *info, u8 sta_id) +{ + struct ieee80211_hdr *hdr = (void *)skb->data; + __le16 fc = hdr->frame_control; + u32 tx_flags = le32_to_cpu(tx_cmd->tx_flags); + u32 len = skb->len + FCS_LEN; + + if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) + tx_flags |= TX_CMD_FLG_ACK; + else + tx_flags &= ~TX_CMD_FLG_ACK; + + if (ieee80211_is_probe_resp(fc)) + tx_flags |= TX_CMD_FLG_TSF; + else if (ieee80211_is_back_req(fc)) + tx_flags |= TX_CMD_FLG_ACK | TX_CMD_FLG_BAR; + + /* High prio packet (wrt. BT coex) if it is EAPOL, MCAST or MGMT */ + if (info->band == IEEE80211_BAND_2GHZ && + (skb->protocol == cpu_to_be16(ETH_P_PAE) || + is_multicast_ether_addr(hdr->addr1) || + ieee80211_is_back_req(fc) || + ieee80211_is_mgmt(fc))) + tx_flags |= TX_CMD_FLG_BT_DIS; + + if (ieee80211_has_morefrags(fc)) + tx_flags |= TX_CMD_FLG_MORE_FRAG; + + 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; + } else { + tx_cmd->tid_tspec = IWL_TID_NON_QOS; + if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) + tx_flags |= TX_CMD_FLG_SEQ_CTL; + else + tx_flags &= ~TX_CMD_FLG_SEQ_CTL; + } + + if (ieee80211_is_mgmt(fc)) { + if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc)) + tx_cmd->pm_frame_timeout = cpu_to_le16(3); + else + tx_cmd->pm_frame_timeout = cpu_to_le16(2); + + /* The spec allows Action frames in A-MPDU, we don't support + * it + */ + WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_AMPDU); + } else { + tx_cmd->pm_frame_timeout = 0; + } + + if (info->flags & IEEE80211_TX_CTL_AMPDU) + tx_flags |= TX_CMD_FLG_PROT_REQUIRE; + + if (ieee80211_is_data(fc) && len > mvm->rts_threshold && + !is_multicast_ether_addr(ieee80211_get_DA(hdr))) + tx_flags |= TX_CMD_FLG_PROT_REQUIRE; + + tx_cmd->driver_txop = 0; + tx_cmd->tx_flags = cpu_to_le32(tx_flags); + /* Total # bytes to be transmitted */ + tx_cmd->len = cpu_to_le16((u16)skb->len); + tx_cmd->next_frame_len = 0; + tx_cmd->life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE); + tx_cmd->sta_id = sta_id; +} + +/* + * Sets the fields in the Tx cmd that are rate related + */ +static void iwl_mvm_set_tx_cmd_rate(struct iwl_mvm *mvm, + struct iwl_tx_cmd *tx_cmd, + struct ieee80211_tx_info *info, + struct ieee80211_sta *sta, + __le16 fc) +{ + u32 rate_flags; + int rate_idx; + u8 rate_plcp; + + /* Set retry limit on RTS packets */ + tx_cmd->rts_retry_limit = IWL_RTS_DFAULT_RETRY_LIMIT; + + /* Set retry limit on DATA packets and Probe Responses*/ + if (ieee80211_is_probe_resp(fc)) { + tx_cmd->data_retry_limit = IWL_MGMT_DFAULT_RETRY_LIMIT; + tx_cmd->rts_retry_limit = + min(tx_cmd->data_retry_limit, tx_cmd->rts_retry_limit); + } else if (ieee80211_is_back_req(fc)) { + tx_cmd->data_retry_limit = IWL_BAR_DFAULT_RETRY_LIMIT; + } else { + tx_cmd->data_retry_limit = IWL_DEFAULT_TX_RETRY; + } + + /* + * for data packets, rate info comes from the table inside he fw. This + * table is controlled by LINK_QUALITY commands + */ + + if (ieee80211_is_data(fc)) { + tx_cmd->initial_rate_index = 0; + tx_cmd->tx_flags |= cpu_to_le32(TX_CMD_FLG_STA_RATE); + return; + } else if (ieee80211_is_back_req(fc)) { + tx_cmd->tx_flags |= cpu_to_le32(TX_CMD_FLG_STA_RATE); + } + + /* HT rate doesn't make sense for a non data frame */ + WARN_ONCE(info->control.rates[0].flags & IEEE80211_TX_RC_MCS, + "Got an HT rate for a non data frame 0x%x\n", + info->control.rates[0].flags); + + rate_idx = info->control.rates[0].idx; + /* if the rate isn't a well known legacy rate, take the lowest one */ + if (rate_idx < 0 || rate_idx > IWL_RATE_COUNT_LEGACY) + rate_idx = rate_lowest_index( + &mvm->nvm_data->bands[info->band], sta); + + /* For 5 GHZ band, remap mac80211 rate indices into driver indices */ + if (info->band == IEEE80211_BAND_5GHZ) + rate_idx += IWL_FIRST_OFDM_RATE; + + /* For 2.4 GHZ band, check that there is no need to remap */ + BUILD_BUG_ON(IWL_FIRST_CCK_RATE != 0); + + /* Get PLCP rate for tx_cmd->rate_n_flags */ + rate_plcp = iwl_mvm_mac80211_idx_to_hwrate(rate_idx); + + mvm->mgmt_last_antenna_idx = + iwl_mvm_next_antenna(mvm, mvm->nvm_data->valid_tx_ant, + mvm->mgmt_last_antenna_idx); + rate_flags = BIT(mvm->mgmt_last_antenna_idx) << RATE_MCS_ANT_POS; + + /* 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 the rate in the TX cmd */ + tx_cmd->rate_n_flags = cpu_to_le32((u32)rate_plcp | rate_flags); +} + +/* + * Sets the fields in the Tx cmd that are crypto related + */ +static void iwl_mvm_set_tx_cmd_crypto(struct iwl_mvm *mvm, + 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 |= cpu_to_le32(TX_CMD_FLG_CCMP_AGG); + break; + + case WLAN_CIPHER_SUITE_TKIP: + tx_cmd->sec_ctl = TX_CMD_SEC_TKIP; + ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key); + 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_WEP_KEY_IDX_POS) & + TX_CMD_SEC_WEP_KEY_IDX_MSK); + + memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen); + break; + default: + IWL_ERR(mvm, "Unknown encode cipher %x\n", keyconf->cipher); + break; + } +} + +/* + * Allocates and sets the Tx cmd the driver data pointers in the skb + */ +static struct iwl_device_cmd * +iwl_mvm_set_tx_params(struct iwl_mvm *mvm, struct sk_buff *skb, + struct ieee80211_sta *sta, u8 sta_id) +{ + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; + struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); + struct iwl_device_cmd *dev_cmd; + struct iwl_tx_cmd *tx_cmd; + + dev_cmd = iwl_trans_alloc_tx_cmd(mvm->trans); + + if (unlikely(!dev_cmd)) + return NULL; + + memset(dev_cmd, 0, sizeof(*dev_cmd)); + tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload; + + if (info->control.hw_key) + iwl_mvm_set_tx_cmd_crypto(mvm, info, tx_cmd, skb); + + iwl_mvm_set_tx_cmd(mvm, skb, tx_cmd, info, sta_id); + + iwl_mvm_set_tx_cmd_rate(mvm, tx_cmd, info, sta, hdr->frame_control); + + memset(&info->status, 0, sizeof(info->status)); + + info->driver_data[0] = NULL; + info->driver_data[1] = dev_cmd; + + return dev_cmd; +} + +int iwl_mvm_tx_skb_non_sta(struct iwl_mvm *mvm, struct sk_buff *skb) +{ + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; + struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); + struct iwl_device_cmd *dev_cmd; + struct iwl_tx_cmd *tx_cmd; + u8 sta_id; + + if (WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_AMPDU)) + return -1; + + if (WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM && + (!info->control.vif || + info->hw_queue != info->control.vif->cab_queue))) + return -1; + + /* + * If the interface on which frame is sent is the P2P_DEVICE + * or an AP/GO interface use the broadcast station associated + * with it; otherwise use the AUX station. + */ + if (info->control.vif && + (info->control.vif->type == NL80211_IFTYPE_P2P_DEVICE || + info->control.vif->type == NL80211_IFTYPE_AP)) { + struct iwl_mvm_vif *mvmvif = + iwl_mvm_vif_from_mac80211(info->control.vif); + sta_id = mvmvif->bcast_sta.sta_id; + } else { + sta_id = mvm->aux_sta.sta_id; + } + + IWL_DEBUG_TX(mvm, "station Id %d, queue=%d\n", sta_id, info->hw_queue); + + dev_cmd = iwl_mvm_set_tx_params(mvm, skb, NULL, sta_id); + if (!dev_cmd) + return -1; + + /* From now on, we cannot access info->control */ + tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload; + + /* Copy MAC header from skb into command buffer */ + memcpy(tx_cmd->hdr, hdr, ieee80211_hdrlen(hdr->frame_control)); + + if (iwl_trans_tx(mvm->trans, skb, dev_cmd, info->hw_queue)) { + iwl_trans_free_tx_cmd(mvm->trans, dev_cmd); + return -1; + } + + return 0; +} + +/* + * Sets the fields in the Tx cmd that are crypto related + */ +int iwl_mvm_tx_skb(struct iwl_mvm *mvm, struct sk_buff *skb, + struct ieee80211_sta *sta) +{ + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; + struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); + struct iwl_mvm_sta *mvmsta; + struct iwl_device_cmd *dev_cmd; + struct iwl_tx_cmd *tx_cmd; + __le16 fc; + u16 seq_number = 0; + u8 tid = IWL_MAX_TID_COUNT; + u8 txq_id = info->hw_queue; + bool is_data_qos = false, is_ampdu = false; + + mvmsta = (void *)sta->drv_priv; + fc = hdr->frame_control; + + if (WARN_ON_ONCE(!mvmsta)) + return -1; + + if (WARN_ON_ONCE(mvmsta->sta_id == IWL_INVALID_STATION)) + return -1; + + dev_cmd = iwl_mvm_set_tx_params(mvm, skb, sta, mvmsta->sta_id); + if (!dev_cmd) + goto drop; + + tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload; + /* From now on, we cannot access info->control */ + + spin_lock(&mvmsta->lock); + + if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc)) { + u8 *qc = NULL; + 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; + + seq_number = mvmsta->tid_data[tid].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; + is_data_qos = true; + is_ampdu = info->flags & IEEE80211_TX_CTL_AMPDU; + } + + /* Copy MAC header from skb into command buffer */ + memcpy(tx_cmd->hdr, hdr, ieee80211_hdrlen(fc)); + + WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM); + + if (is_ampdu) { + if (WARN_ON_ONCE(mvmsta->tid_data[tid].state != IWL_AGG_ON)) + goto drop_unlock_sta; + txq_id = mvmsta->tid_data[tid].txq_id; + } + + IWL_DEBUG_TX(mvm, "TX to [%d|%d] Q:%d - seq: 0x%x\n", mvmsta->sta_id, + tid, txq_id, seq_number); + + /* NOTE: aggregation will need changes here (for txq id) */ + if (iwl_trans_tx(mvm->trans, skb, dev_cmd, txq_id)) + goto drop_unlock_sta; + + if (is_data_qos && !ieee80211_has_morefrags(fc)) + mvmsta->tid_data[tid].seq_number = seq_number; + + spin_unlock(&mvmsta->lock); + + if (mvmsta->vif->type == NL80211_IFTYPE_AP && + txq_id < IWL_FIRST_AMPDU_QUEUE) + atomic_inc(&mvmsta->pending_frames); + + return 0; + +drop_unlock_sta: + iwl_trans_free_tx_cmd(mvm->trans, dev_cmd); + spin_unlock(&mvmsta->lock); +drop: + return -1; +} + +static void iwl_mvm_check_ratid_empty(struct iwl_mvm *mvm, + struct ieee80211_sta *sta, u8 tid) +{ + struct iwl_mvm_sta *mvmsta = (void *)sta->drv_priv; + struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid]; + struct ieee80211_vif *vif = mvmsta->vif; + + lockdep_assert_held(&mvmsta->lock); + + if (tid_data->ssn != tid_data->next_reclaimed) + return; + + switch (tid_data->state) { + case IWL_EMPTYING_HW_QUEUE_ADDBA: + IWL_DEBUG_TX_QUEUES(mvm, + "Can continue addBA flow ssn = next_recl = %d\n", + tid_data->next_reclaimed); + tid_data->state = IWL_AGG_STARTING; + ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid); + break; + + case IWL_EMPTYING_HW_QUEUE_DELBA: + IWL_DEBUG_TX_QUEUES(mvm, + "Can continue DELBA flow ssn = next_recl = %d\n", + tid_data->next_reclaimed); + iwl_trans_txq_disable(mvm->trans, tid_data->txq_id); + tid_data->state = IWL_AGG_OFF; + /* + * we can't hold the mutex - but since we are after a sequence + * point (call to iwl_trans_txq_disable), so we don't even need + * a memory barrier. + */ + mvm->queue_to_mac80211[tid_data->txq_id] = + IWL_INVALID_MAC80211_QUEUE; + ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid); + break; + + default: + break; + } +} + +#ifdef CONFIG_IWLWIFI_DEBUG +const char *iwl_mvm_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(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(SMALL_CF_POLL); + TX_STATUS_FAIL(FW_DROP); + TX_STATUS_FAIL(STA_COLOR_MISMATCH); + } + + return "UNKNOWN"; + +#undef TX_STATUS_FAIL +#undef TX_STATUS_POSTPONE +} +#endif /* CONFIG_IWLWIFI_DEBUG */ + +/** + * translate ucode response to mac80211 tx status control values + */ +static void iwl_mvm_hwrate_to_tx_control(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_HT_MCS_GF_MSK) + r->flags |= IEEE80211_TX_RC_GREEN_FIELD; + switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) { + case RATE_MCS_CHAN_WIDTH_20: + break; + case RATE_MCS_CHAN_WIDTH_40: + r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; + break; + case RATE_MCS_CHAN_WIDTH_80: + r->flags |= IEEE80211_TX_RC_80_MHZ_WIDTH; + break; + case RATE_MCS_CHAN_WIDTH_160: + r->flags |= IEEE80211_TX_RC_160_MHZ_WIDTH; + break; + } + if (rate_n_flags & RATE_MCS_SGI_MSK) + r->flags |= IEEE80211_TX_RC_SHORT_GI; + if (rate_n_flags & RATE_MCS_HT_MSK) { + r->flags |= IEEE80211_TX_RC_MCS; + r->idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK; + } else if (rate_n_flags & RATE_MCS_VHT_MSK) { + ieee80211_rate_set_vht( + r, rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK, + ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >> + RATE_VHT_MCS_NSS_POS) + 1); + r->flags |= IEEE80211_TX_RC_VHT_MCS; + } else { + r->idx = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags, + info->band); + } +} + +static void iwl_mvm_rx_tx_cmd_single(struct iwl_mvm *mvm, + struct iwl_rx_packet *pkt) +{ + struct ieee80211_sta *sta; + u16 sequence = le16_to_cpu(pkt->hdr.sequence); + int txq_id = SEQ_TO_QUEUE(sequence); + struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data; + int sta_id = IWL_MVM_TX_RES_GET_RA(tx_resp->ra_tid); + int tid = IWL_MVM_TX_RES_GET_TID(tx_resp->ra_tid); + u32 status = le16_to_cpu(tx_resp->status.status); + u16 ssn = iwl_mvm_get_scd_ssn(tx_resp); + struct iwl_mvm_sta *mvmsta; + struct sk_buff_head skbs; + u8 skb_freed = 0; + u16 next_reclaimed, seq_ctl; + + __skb_queue_head_init(&skbs); + + seq_ctl = le16_to_cpu(tx_resp->seq_ctl); + + /* we can free until ssn % q.n_bd not inclusive */ + iwl_trans_reclaim(mvm->trans, txq_id, ssn, &skbs); + + while (!skb_queue_empty(&skbs)) { + struct sk_buff *skb = __skb_dequeue(&skbs); + struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); + + skb_freed++; + + iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]); + + memset(&info->status, 0, sizeof(info->status)); + + info->flags &= ~IEEE80211_TX_CTL_AMPDU; + + /* inform mac80211 about what happened with the frame */ + switch (status & TX_STATUS_MSK) { + case TX_STATUS_SUCCESS: + case TX_STATUS_DIRECT_DONE: + info->flags |= IEEE80211_TX_STAT_ACK; + break; + case TX_STATUS_FAIL_DEST_PS: + info->flags |= IEEE80211_TX_STAT_TX_FILTERED; + break; + default: + break; + } + + info->status.rates[0].count = tx_resp->failure_frame + 1; + iwl_mvm_hwrate_to_tx_control(le32_to_cpu(tx_resp->initial_rate), + info); + + /* Single frame failure in an AMPDU queue => send BAR */ + if (txq_id >= IWL_FIRST_AMPDU_QUEUE && + !(info->flags & IEEE80211_TX_STAT_ACK)) { + /* there must be only one skb in the skb_list */ + WARN_ON_ONCE(skb_freed > 1 || + !skb_queue_empty(&skbs)); + info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK; + } + + /* W/A FW bug: seq_ctl is wrong when the queue is flushed */ + if (status == TX_STATUS_FAIL_FIFO_FLUSHED) { + struct ieee80211_hdr *hdr = (void *)skb->data; + seq_ctl = le16_to_cpu(hdr->seq_ctrl); + } + + ieee80211_tx_status_ni(mvm->hw, skb); + } + + if (txq_id >= IWL_FIRST_AMPDU_QUEUE) { + /* If this is an aggregation queue, we use the ssn since: + * ssn = wifi seq_num % 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. In that + * case, several packets will be reclaimed even if + * frame_count = 1. + * + * The ssn is the index (% 256) of the latest packet that has + * treated (acked / dropped) + 1. + */ + next_reclaimed = ssn; + } else { + /* The next packet to be reclaimed is the one after this one */ + next_reclaimed = SEQ_TO_SN(seq_ctl + 0x10); + } + + IWL_DEBUG_TX_REPLY(mvm, + "TXQ %d status %s (0x%08x)\n\t\t\t\tinitial_rate 0x%x " + "retries %d, idx=%d ssn=%d next_reclaimed=0x%x seq_ctl=0x%x\n", + txq_id, iwl_mvm_get_tx_fail_reason(status), + status, le32_to_cpu(tx_resp->initial_rate), + tx_resp->failure_frame, SEQ_TO_INDEX(sequence), + ssn, next_reclaimed, seq_ctl); + + rcu_read_lock(); + + sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]); + + if (!IS_ERR_OR_NULL(sta)) { + mvmsta = (void *)sta->drv_priv; + + if (tid != IWL_TID_NON_QOS) { + struct iwl_mvm_tid_data *tid_data = + &mvmsta->tid_data[tid]; + + spin_lock_bh(&mvmsta->lock); + tid_data->next_reclaimed = next_reclaimed; + IWL_DEBUG_TX_REPLY(mvm, "Next reclaimed packet:%d\n", + next_reclaimed); + iwl_mvm_check_ratid_empty(mvm, sta, tid); + spin_unlock_bh(&mvmsta->lock); + } + +#ifdef CONFIG_PM_SLEEP + mvmsta->last_seq_ctl = seq_ctl; +#endif + } else { + sta = NULL; + mvmsta = NULL; + } + + /* + * If the txq is not an AMPDU queue, there is no chance we freed + * several skbs. Check that out... + * If there are no pending frames for this STA, notify mac80211 that + * this station can go to sleep in its STA table. + */ + if (txq_id < IWL_FIRST_AMPDU_QUEUE && mvmsta && + !WARN_ON(skb_freed > 1) && + mvmsta->vif->type == NL80211_IFTYPE_AP && + atomic_sub_and_test(skb_freed, &mvmsta->pending_frames)) { + ieee80211_sta_block_awake(mvm->hw, sta, false); + set_bit(sta_id, mvm->sta_drained); + schedule_work(&mvm->sta_drained_wk); + } + + rcu_read_unlock(); +} + +#ifdef CONFIG_IWLWIFI_DEBUG +#define AGG_TX_STATE_(x) case AGG_TX_STATE_ ## x: return #x +static const char *iwl_get_agg_tx_status(u16 status) +{ + switch (status & AGG_TX_STATE_STATUS_MSK) { + AGG_TX_STATE_(TRANSMITTED); + AGG_TX_STATE_(UNDERRUN); + AGG_TX_STATE_(BT_PRIO); + AGG_TX_STATE_(FEW_BYTES); + AGG_TX_STATE_(ABORT); + AGG_TX_STATE_(LAST_SENT_TTL); + AGG_TX_STATE_(LAST_SENT_TRY_CNT); + AGG_TX_STATE_(LAST_SENT_BT_KILL); + AGG_TX_STATE_(SCD_QUERY); + AGG_TX_STATE_(TEST_BAD_CRC32); + AGG_TX_STATE_(RESPONSE); + AGG_TX_STATE_(DUMP_TX); + AGG_TX_STATE_(DELAY_TX); + } + + return "UNKNOWN"; +} + +static void iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm *mvm, + struct iwl_rx_packet *pkt) +{ + struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data; + struct agg_tx_status *frame_status = &tx_resp->status; + int i; + + for (i = 0; i < tx_resp->frame_count; i++) { + u16 fstatus = le16_to_cpu(frame_status[i].status); + + IWL_DEBUG_TX_REPLY(mvm, + "status %s (0x%04x), try-count (%d) seq (0x%x)\n", + iwl_get_agg_tx_status(fstatus), + fstatus & AGG_TX_STATE_STATUS_MSK, + (fstatus & AGG_TX_STATE_TRY_CNT_MSK) >> + AGG_TX_STATE_TRY_CNT_POS, + le16_to_cpu(frame_status[i].sequence)); + } +} +#else +static void iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm *mvm, + struct iwl_rx_packet *pkt) +{} +#endif /* CONFIG_IWLWIFI_DEBUG */ + +static void iwl_mvm_rx_tx_cmd_agg(struct iwl_mvm *mvm, + struct iwl_rx_packet *pkt) +{ + struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data; + int sta_id = IWL_MVM_TX_RES_GET_RA(tx_resp->ra_tid); + int tid = IWL_MVM_TX_RES_GET_TID(tx_resp->ra_tid); + u16 sequence = le16_to_cpu(pkt->hdr.sequence); + struct ieee80211_sta *sta; + + if (WARN_ON_ONCE(SEQ_TO_QUEUE(sequence) < IWL_FIRST_AMPDU_QUEUE)) + return; + + if (WARN_ON_ONCE(tid == IWL_TID_NON_QOS)) + return; + + iwl_mvm_rx_tx_cmd_agg_dbg(mvm, pkt); + + rcu_read_lock(); + + sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]); + + if (!WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) { + struct iwl_mvm_sta *mvmsta = (void *)sta->drv_priv; + mvmsta->tid_data[tid].rate_n_flags = + le32_to_cpu(tx_resp->initial_rate); + } + + rcu_read_unlock(); +} + +int iwl_mvm_rx_tx_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb, + struct iwl_device_cmd *cmd) +{ + struct iwl_rx_packet *pkt = rxb_addr(rxb); + struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data; + + if (tx_resp->frame_count == 1) + iwl_mvm_rx_tx_cmd_single(mvm, pkt); + else + iwl_mvm_rx_tx_cmd_agg(mvm, pkt); + + return 0; +} + +int iwl_mvm_rx_ba_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb, + struct iwl_device_cmd *cmd) +{ + struct iwl_rx_packet *pkt = rxb_addr(rxb); + struct iwl_mvm_ba_notif *ba_notif = (void *)pkt->data; + struct sk_buff_head reclaimed_skbs; + struct iwl_mvm_tid_data *tid_data; + struct ieee80211_tx_info *info; + struct ieee80211_sta *sta; + struct iwl_mvm_sta *mvmsta; + struct ieee80211_hdr *hdr; + struct sk_buff *skb; + int sta_id, tid, freed; + + /* "flow" corresponds to Tx queue */ + u16 scd_flow = le16_to_cpu(ba_notif->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_notif->scd_ssn); + + sta_id = ba_notif->sta_id; + tid = ba_notif->tid; + + rcu_read_lock(); + + sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]); + + /* Reclaiming frames for a station that has been deleted ? */ + if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) { + rcu_read_unlock(); + return 0; + } + + mvmsta = (void *)sta->drv_priv; + tid_data = &mvmsta->tid_data[tid]; + + if (WARN_ONCE(tid_data->txq_id != scd_flow, "Q %d, tid %d, flow %d", + tid_data->txq_id, tid, scd_flow)) { + rcu_read_unlock(); + return 0; + } + + spin_lock_bh(&mvmsta->lock); + + __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). + */ + iwl_trans_reclaim(mvm->trans, scd_flow, ba_resp_scd_ssn, + &reclaimed_skbs); + + IWL_DEBUG_TX_REPLY(mvm, + "BA_NOTIFICATION Received from %pM, sta_id = %d\n", + (u8 *)&ba_notif->sta_addr_lo32, + ba_notif->sta_id); + IWL_DEBUG_TX_REPLY(mvm, + "TID = %d, SeqCtl = %d, bitmap = 0x%llx, scd_flow = %d, scd_ssn = %d sent:%d, acked:%d\n", + ba_notif->tid, le16_to_cpu(ba_notif->seq_ctl), + (unsigned long long)le64_to_cpu(ba_notif->bitmap), + scd_flow, ba_resp_scd_ssn, ba_notif->txed, + ba_notif->txed_2_done); + + tid_data->next_reclaimed = ba_resp_scd_ssn; + + iwl_mvm_check_ratid_empty(mvm, sta, 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); + iwl_trans_free_tx_cmd(mvm->trans, 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_notif->txed_2_done; + info->status.ampdu_len = ba_notif->txed; + iwl_mvm_hwrate_to_tx_control(tid_data->rate_n_flags, + info); + } + } + + spin_unlock_bh(&mvmsta->lock); + + rcu_read_unlock(); + + while (!skb_queue_empty(&reclaimed_skbs)) { + skb = __skb_dequeue(&reclaimed_skbs); + ieee80211_tx_status_ni(mvm->hw, skb); + } + + return 0; +} + +int iwl_mvm_flush_tx_path(struct iwl_mvm *mvm, u32 tfd_msk, bool sync) +{ + int ret; + struct iwl_tx_path_flush_cmd flush_cmd = { + .queues_ctl = cpu_to_le32(tfd_msk), + .flush_ctl = cpu_to_le16(DUMP_TX_FIFO_FLUSH), + }; + + u32 flags = sync ? CMD_SYNC : CMD_ASYNC; + + ret = iwl_mvm_send_cmd_pdu(mvm, TXPATH_FLUSH, flags, + sizeof(flush_cmd), &flush_cmd); + if (ret) + IWL_ERR(mvm, "Failed to send flush command (%d)\n", ret); + return ret; +} |