tx.c 49.5 KB
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/******************************************************************************
 *
 * 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
 *
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 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
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 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
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 * Copyright(c) 2016        Intel Deutschland GmbH
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 *
 * 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
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 * in the file called COPYING.
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 *
 * Contact Information:
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 *  Intel Linux Wireless <linuxwifi@intel.com>
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 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
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 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
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 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
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 * 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>
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#include <linux/tcp.h>
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#include <net/ip.h>
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#include <net/ipv6.h>
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#include "iwl-trans.h"
#include "iwl-eeprom-parse.h"
#include "mvm.h"
#include "sta.h"
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#include "fw-dbg.h"
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static void
iwl_mvm_bar_check_trigger(struct iwl_mvm *mvm, const u8 *addr,
			  u16 tid, u16 ssn)
{
	struct iwl_fw_dbg_trigger_tlv *trig;
	struct iwl_fw_dbg_trigger_ba *ba_trig;

	if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_BA))
		return;

	trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_BA);
	ba_trig = (void *)trig->data;

	if (!iwl_fw_dbg_trigger_check_stop(mvm, NULL, trig))
		return;

	if (!(le16_to_cpu(ba_trig->tx_bar) & BIT(tid)))
		return;

	iwl_mvm_fw_dbg_collect_trig(mvm, trig,
				    "BAR sent to %pM, tid %d, ssn %d",
				    addr, tid, ssn);
}

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#define OPT_HDR(type, skb, off) \
	(type *)(skb_network_header(skb) + (off))

static void iwl_mvm_tx_csum(struct iwl_mvm *mvm, struct sk_buff *skb,
			    struct ieee80211_hdr *hdr,
			    struct ieee80211_tx_info *info,
			    struct iwl_tx_cmd *tx_cmd)
{
#if IS_ENABLED(CONFIG_INET)
	u16 mh_len = ieee80211_hdrlen(hdr->frame_control);
	u16 offload_assist = le16_to_cpu(tx_cmd->offload_assist);
	u8 protocol = 0;

	/*
	 * Do not compute checksum if already computed or if transport will
	 * compute it
	 */
	if (skb->ip_summed != CHECKSUM_PARTIAL || IWL_MVM_SW_TX_CSUM_OFFLOAD)
		return;

	/* We do not expect to be requested to csum stuff we do not support */
	if (WARN_ONCE(!(mvm->hw->netdev_features & IWL_TX_CSUM_NETIF_FLAGS) ||
		      (skb->protocol != htons(ETH_P_IP) &&
		       skb->protocol != htons(ETH_P_IPV6)),
		      "No support for requested checksum\n")) {
		skb_checksum_help(skb);
		return;
	}

	if (skb->protocol == htons(ETH_P_IP)) {
		protocol = ip_hdr(skb)->protocol;
	} else {
#if IS_ENABLED(CONFIG_IPV6)
		struct ipv6hdr *ipv6h =
			(struct ipv6hdr *)skb_network_header(skb);
		unsigned int off = sizeof(*ipv6h);

		protocol = ipv6h->nexthdr;
		while (protocol != NEXTHDR_NONE && ipv6_ext_hdr(protocol)) {
			/* only supported extension headers */
			if (protocol != NEXTHDR_ROUTING &&
			    protocol != NEXTHDR_HOP &&
			    protocol != NEXTHDR_DEST &&
			    protocol != NEXTHDR_FRAGMENT) {
				skb_checksum_help(skb);
				return;
			}

			if (protocol == NEXTHDR_FRAGMENT) {
				struct frag_hdr *hp =
					OPT_HDR(struct frag_hdr, skb, off);

				protocol = hp->nexthdr;
				off += sizeof(struct frag_hdr);
			} else {
				struct ipv6_opt_hdr *hp =
					OPT_HDR(struct ipv6_opt_hdr, skb, off);

				protocol = hp->nexthdr;
				off += ipv6_optlen(hp);
			}
		}
		/* if we get here - protocol now should be TCP/UDP */
#endif
	}

	if (protocol != IPPROTO_TCP && protocol != IPPROTO_UDP) {
		WARN_ON_ONCE(1);
		skb_checksum_help(skb);
		return;
	}

	/* enable L4 csum */
	offload_assist |= BIT(TX_CMD_OFFLD_L4_EN);

	/*
	 * Set offset to IP header (snap).
	 * We don't support tunneling so no need to take care of inner header.
	 * Size is in words.
	 */
	offload_assist |= (4 << TX_CMD_OFFLD_IP_HDR);

	/* Do IPv4 csum for AMSDU only (no IP csum for Ipv6) */
	if (skb->protocol == htons(ETH_P_IP) &&
	    (offload_assist & BIT(TX_CMD_OFFLD_AMSDU))) {
		ip_hdr(skb)->check = 0;
		offload_assist |= BIT(TX_CMD_OFFLD_L3_EN);
	}

	/* reset UDP/TCP header csum */
	if (protocol == IPPROTO_TCP)
		tcp_hdr(skb)->check = 0;
	else
		udp_hdr(skb)->check = 0;

	/* mac header len should include IV, size is in words */
	if (info->control.hw_key)
		mh_len += info->control.hw_key->iv_len;
	mh_len /= 2;
	offload_assist |= mh_len << TX_CMD_OFFLD_MH_SIZE;

	tx_cmd->offload_assist = cpu_to_le16(offload_assist);
#endif
}

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/*
 * Sets most of the Tx cmd's fields
 */
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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)
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{
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	struct ieee80211_tx_info *skb_info = IEEE80211_SKB_CB(skb);
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	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;
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	u8 ac;
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	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;

	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;
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		if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
			tx_cmd->offload_assist |=
				cpu_to_le16(BIT(TX_CMD_OFFLD_AMSDU));
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	} else if (ieee80211_is_back_req(fc)) {
		struct ieee80211_bar *bar = (void *)skb->data;
		u16 control = le16_to_cpu(bar->control);
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		u16 ssn = le16_to_cpu(bar->start_seq_num);
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		tx_flags |= TX_CMD_FLG_ACK | TX_CMD_FLG_BAR;
		tx_cmd->tid_tspec = (control &
				     IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
			IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
		WARN_ON_ONCE(tx_cmd->tid_tspec >= IWL_MAX_TID_COUNT);
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		iwl_mvm_bar_check_trigger(mvm, bar->ra, tx_cmd->tid_tspec,
					  ssn);
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	} 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;
	}

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	/* Default to 0 (BE) when tid_spec is set to IWL_TID_NON_QOS */
	if (tx_cmd->tid_tspec < IWL_MAX_TID_COUNT)
		ac = tid_to_mac80211_ac[tx_cmd->tid_tspec];
	else
		ac = tid_to_mac80211_ac[0];

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	tx_flags |= iwl_mvm_bt_coex_tx_prio(mvm, hdr, info, ac) <<
			TX_CMD_FLG_BT_PRIO_POS;

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	if (ieee80211_is_mgmt(fc)) {
		if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
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			tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_ASSOC);
		else if (ieee80211_is_action(fc))
			tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_NONE);
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		else
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			tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_MGMT);
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		/* The spec allows Action frames in A-MPDU, we don't support
		 * it
		 */
		WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_AMPDU);
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	} else if (info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO) {
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		tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_MGMT);
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	} else {
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		tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_NONE);
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	}

	if (ieee80211_is_data(fc) && len > mvm->rts_threshold &&
	    !is_multicast_ether_addr(ieee80211_get_DA(hdr)))
		tx_flags |= TX_CMD_FLG_PROT_REQUIRE;

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	if (fw_has_capa(&mvm->fw->ucode_capa,
			IWL_UCODE_TLV_CAPA_TXPOWER_INSERTION_SUPPORT) &&
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	    ieee80211_action_contains_tpc(skb))
		tx_flags |= TX_CMD_FLG_WRITE_TX_POWER;

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	tx_cmd->tx_flags = cpu_to_le32(tx_flags);
	/* Total # bytes to be transmitted */
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	tx_cmd->len = cpu_to_le16((u16)skb->len +
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		(uintptr_t)skb_info->driver_data[0]);
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	tx_cmd->life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
	tx_cmd->sta_id = sta_id;
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	/* padding is inserted later in transport */
	if (ieee80211_hdrlen(fc) % 4 &&
	    !(tx_cmd->offload_assist & cpu_to_le16(BIT(TX_CMD_OFFLD_AMSDU))))
		tx_cmd->offload_assist |= cpu_to_le16(BIT(TX_CMD_OFFLD_PAD));
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	iwl_mvm_tx_csum(mvm, skb, hdr, info, tx_cmd);
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}

/*
 * Sets the fields in the Tx cmd that are rate related
 */
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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)
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{
	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;
	}

	/*
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	 * for data packets, rate info comes from the table inside the fw. This
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	 * table is controlled by LINK_QUALITY commands
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	 */

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	if (ieee80211_is_data(fc) && sta) {
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		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)) {
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		tx_cmd->tx_flags |=
			cpu_to_le32(TX_CMD_FLG_ACK | TX_CMD_FLG_BAR);
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	}

	/* HT rate doesn't make sense for a non data frame */
	WARN_ONCE(info->control.rates[0].flags & IEEE80211_TX_RC_MCS,
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		  "Got an HT rate (flags:0x%x/mcs:%d) for a non data frame (fc:0x%x)\n",
		  info->control.rates[0].flags,
		  info->control.rates[0].idx,
		  le16_to_cpu(fc));
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	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 */
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	if (info->band == NL80211_BAND_5GHZ)
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		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 =
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		iwl_mvm_next_antenna(mvm, iwl_mvm_get_valid_tx_ant(mvm),
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				     mvm->mgmt_last_antenna_idx);
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	if (info->band == NL80211_BAND_2GHZ &&
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	    !iwl_mvm_bt_coex_is_shared_ant_avail(mvm))
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		rate_flags = mvm->cfg->non_shared_ant << RATE_MCS_ANT_POS;
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	else
		rate_flags =
			BIT(mvm->mgmt_last_antenna_idx) << RATE_MCS_ANT_POS;
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	/* 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
 */
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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,
				      int hdrlen)
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{
	struct ieee80211_key_conf *keyconf = info->control.hw_key;
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	u8 *crypto_hdr = skb_frag->data + hdrlen;
	u64 pn;
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	switch (keyconf->cipher) {
	case WLAN_CIPHER_SUITE_CCMP:
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	case WLAN_CIPHER_SUITE_CCMP_256:
		iwl_mvm_set_tx_cmd_ccmp(info, tx_cmd);
		pn = atomic64_inc_return(&keyconf->tx_pn);
		crypto_hdr[0] = pn;
		crypto_hdr[2] = 0;
		crypto_hdr[3] = 0x20 | (keyconf->keyidx << 6);
		crypto_hdr[1] = pn >> 8;
		crypto_hdr[4] = pn >> 16;
		crypto_hdr[5] = pn >> 24;
		crypto_hdr[6] = pn >> 32;
		crypto_hdr[7] = pn >> 40;
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		break;

	case WLAN_CIPHER_SUITE_TKIP:
		tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
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		pn = atomic64_inc_return(&keyconf->tx_pn);
		ieee80211_tkip_add_iv(crypto_hdr, keyconf, pn);
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		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:
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		tx_cmd->sec_ctl |= TX_CMD_SEC_EXT;
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	}
}

/*
 * 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,
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		      struct ieee80211_tx_info *info, int hdrlen,
		      struct ieee80211_sta *sta, u8 sta_id)
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{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
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	struct ieee80211_tx_info *skb_info = IEEE80211_SKB_CB(skb);
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	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));
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	dev_cmd->hdr.cmd = TX_CMD;
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	tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;

	if (info->control.hw_key)
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		iwl_mvm_set_tx_cmd_crypto(mvm, info, tx_cmd, skb, hdrlen);
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	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);

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	memset(&skb_info->status, 0, sizeof(skb_info->status));
	memset(skb_info->driver_data, 0, sizeof(skb_info->driver_data));
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	skb_info->driver_data[1] = dev_cmd;
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	return dev_cmd;
}

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static int iwl_mvm_get_ctrl_vif_queue(struct iwl_mvm *mvm,
				      struct ieee80211_tx_info *info, __le16 fc)
{
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	if (iwl_mvm_is_dqa_supported(mvm)) {
		if (info->control.vif->type == NL80211_IFTYPE_AP &&
		    ieee80211_is_probe_resp(fc))
			return IWL_MVM_DQA_AP_PROBE_RESP_QUEUE;
		else if (ieee80211_is_mgmt(fc) &&
			 info->control.vif->type == NL80211_IFTYPE_P2P_DEVICE)
			return IWL_MVM_DQA_P2P_DEVICE_QUEUE;
	}
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	return info->hw_queue;
}

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int iwl_mvm_tx_skb_non_sta(struct iwl_mvm *mvm, struct sk_buff *skb)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
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	struct ieee80211_tx_info *skb_info = IEEE80211_SKB_CB(skb);
	struct ieee80211_tx_info info;
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	struct iwl_device_cmd *dev_cmd;
	struct iwl_tx_cmd *tx_cmd;
	u8 sta_id;
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	int hdrlen = ieee80211_hdrlen(hdr->frame_control);
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	int queue;
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	memcpy(&info, skb->cb, sizeof(info));

	if (WARN_ON_ONCE(info.flags & IEEE80211_TX_CTL_AMPDU))
J
Johannes Berg 已提交
507 508
		return -1;

509 510 511
	if (WARN_ON_ONCE(info.flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM &&
			 (!info.control.vif ||
			  info.hw_queue != info.control.vif->cab_queue)))
J
Johannes Berg 已提交
512 513
		return -1;

514
	/* This holds the amsdu headers length */
515
	skb_info->driver_data[0] = (void *)(uintptr_t)0;
516

A
Ariej Marjieh 已提交
517 518 519 520 521 522 523
	/*
	 * IWL_MVM_OFFCHANNEL_QUEUE is used for ROC packets that can be used
	 * in 2 different types of vifs, P2P & STATION. P2P uses the offchannel
	 * queue. STATION (HS2.0) uses the auxiliary context of the FW,
	 * and hence needs to be sent on the aux queue
	 */
	if (IEEE80211_SKB_CB(skb)->hw_queue == IWL_MVM_OFFCHANNEL_QUEUE &&
524
	    info.control.vif->type == NL80211_IFTYPE_STATION)
A
Ariej Marjieh 已提交
525 526
		IEEE80211_SKB_CB(skb)->hw_queue = mvm->aux_queue;

527 528
	queue = info.hw_queue;

J
Johannes Berg 已提交
529
	/*
530
	 * If the interface on which the frame is sent is the P2P_DEVICE
J
Johannes Berg 已提交
531
	 * or an AP/GO interface use the broadcast station associated
532 533 534 535 536
	 * with it; otherwise if the interface is a managed interface
	 * use the AP station associated with it for multicast traffic
	 * (this is not possible for unicast packets as a TLDS discovery
	 * response are sent without a station entry); otherwise use the
	 * AUX station.
J
Johannes Berg 已提交
537
	 */
538
	sta_id = mvm->aux_sta.sta_id;
539
	if (info.control.vif) {
J
Johannes Berg 已提交
540
		struct iwl_mvm_vif *mvmvif =
541
			iwl_mvm_vif_from_mac80211(info.control.vif);
542

543
		if (info.control.vif->type == NL80211_IFTYPE_P2P_DEVICE ||
544
		    info.control.vif->type == NL80211_IFTYPE_AP) {
545
			sta_id = mvmvif->bcast_sta.sta_id;
546 547 548 549
			queue = iwl_mvm_get_ctrl_vif_queue(mvm, &info,
							   hdr->frame_control);
		} else if (info.control.vif->type == NL80211_IFTYPE_STATION &&
			   is_multicast_ether_addr(hdr->addr1)) {
550 551 552 553 554
			u8 ap_sta_id = ACCESS_ONCE(mvmvif->ap_sta_id);

			if (ap_sta_id != IWL_MVM_STATION_COUNT)
				sta_id = ap_sta_id;
		}
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555 556
	}

557
	IWL_DEBUG_TX(mvm, "station Id %d, queue=%d\n", sta_id, queue);
J
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558

559
	dev_cmd = iwl_mvm_set_tx_params(mvm, skb, &info, hdrlen, NULL, sta_id);
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560 561 562 563 564 565
	if (!dev_cmd)
		return -1;

	tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;

	/* Copy MAC header from skb into command buffer */
566
	memcpy(tx_cmd->hdr, hdr, hdrlen);
J
Johannes Berg 已提交
567

568
	if (iwl_trans_tx(mvm->trans, skb, dev_cmd, queue)) {
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569 570 571 572
		iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
		return -1;
	}

573 574 575 576 577 578 579 580 581
	/*
	 * Increase the pending frames counter, so that later when a reply comes
	 * in and the counter is decreased - we don't start getting negative
	 * values.
	 * Note that we don't need to make sure it isn't agg'd, since we're
	 * TXing non-sta
	 */
	atomic_inc(&mvm->pending_frames[sta_id]);

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582 583 584
	return 0;
}

585 586
#ifdef CONFIG_INET
static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb,
587
			  struct ieee80211_tx_info *info,
588 589 590
			  struct ieee80211_sta *sta,
			  struct sk_buff_head *mpdus_skb)
{
591
	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
592 593
	struct ieee80211_hdr *hdr = (void *)skb->data;
	unsigned int mss = skb_shinfo(skb)->gso_size;
594
	struct sk_buff *tmp, *next;
595
	char cb[sizeof(skb->cb)];
596
	unsigned int num_subframes, tcp_payload_len, subf_len, max_amsdu_len;
597 598 599
	bool ipv4 = (skb->protocol == htons(ETH_P_IP));
	u16 ip_base_id = ipv4 ? ntohs(ip_hdr(skb)->id) : 0;
	u16 amsdu_add, snap_ip_tcp, pad, i = 0;
600
	unsigned int dbg_max_amsdu_len;
601
	netdev_features_t netdev_features = NETIF_F_CSUM_MASK | NETIF_F_SG;
602
	u8 *qc, tid, txf;
603 604 605 606

	snap_ip_tcp = 8 + skb_transport_header(skb) - skb_network_header(skb) +
		tcp_hdrlen(skb);

607 608 609 610 611
	qc = ieee80211_get_qos_ctl(hdr);
	tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
	if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
		return -EINVAL;

612 613
	dbg_max_amsdu_len = ACCESS_ONCE(mvm->max_amsdu_len);

614
	if (!sta->max_amsdu_len ||
615
	    !ieee80211_is_data_qos(hdr->frame_control) ||
616
	    (!mvmsta->tlc_amsdu && !dbg_max_amsdu_len)) {
617 618 619 620 621
		num_subframes = 1;
		pad = 0;
		goto segment;
	}

622 623 624 625 626 627 628 629 630 631 632 633 634
	/*
	 * Do not build AMSDU for IPv6 with extension headers.
	 * ask stack to segment and checkum the generated MPDUs for us.
	 */
	if (skb->protocol == htons(ETH_P_IPV6) &&
	    ((struct ipv6hdr *)skb_network_header(skb))->nexthdr !=
	    IPPROTO_TCP) {
		num_subframes = 1;
		pad = 0;
		netdev_features &= ~NETIF_F_CSUM_MASK;
		goto segment;
	}

635 636 637 638 639 640
	/*
	 * No need to lock amsdu_in_ampdu_allowed since it can't be modified
	 * during an BA session.
	 */
	if (info->flags & IEEE80211_TX_CTL_AMPDU &&
	    !mvmsta->tid_data[tid].amsdu_in_ampdu_allowed) {
641 642 643 644 645
		num_subframes = 1;
		pad = 0;
		goto segment;
	}

646
	max_amsdu_len = sta->max_amsdu_len;
647 648 649 650 651 652 653 654 655 656 657 658 659

	/* the Tx FIFO to which this A-MSDU will be routed */
	txf = iwl_mvm_ac_to_tx_fifo[tid_to_mac80211_ac[tid]];

	/*
	 * Don't send an AMSDU that will be longer than the TXF.
	 * Add a security margin of 256 for the TX command + headers.
	 * We also want to have the start of the next packet inside the
	 * fifo to be able to send bursts.
	 */
	max_amsdu_len = min_t(unsigned int, max_amsdu_len,
			      mvm->shared_mem_cfg.txfifo_size[txf] - 256);

660
	if (unlikely(dbg_max_amsdu_len))
661 662
		max_amsdu_len = min_t(unsigned int, max_amsdu_len,
				      dbg_max_amsdu_len);
663 664 665 666 667 668 669 670 671 672

	/*
	 * Limit A-MSDU in A-MPDU to 4095 bytes when VHT is not
	 * supported. This is a spec requirement (IEEE 802.11-2015
	 * section 8.7.3 NOTE 3).
	 */
	if (info->flags & IEEE80211_TX_CTL_AMPDU &&
	    !sta->vht_cap.vht_supported)
		max_amsdu_len = min_t(unsigned int, max_amsdu_len, 4095);

673 674 675 676 677 678 679 680
	/* Sub frame header + SNAP + IP header + TCP header + MSS */
	subf_len = sizeof(struct ethhdr) + snap_ip_tcp + mss;
	pad = (4 - subf_len) & 0x3;

	/*
	 * If we have N subframes in the A-MSDU, then the A-MSDU's size is
	 * N * subf_len + (N - 1) * pad.
	 */
681 682
	num_subframes = (max_amsdu_len + pad) / (subf_len + pad);
	if (num_subframes > 1)
683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700
		*qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;

	tcp_payload_len = skb_tail_pointer(skb) - skb_transport_header(skb) -
		tcp_hdrlen(skb) + skb->data_len;

	/*
	 * Make sure we have enough TBs for the A-MSDU:
	 *	2 for each subframe
	 *	1 more for each fragment
	 *	1 more for the potential data in the header
	 */
	num_subframes =
		min_t(unsigned int, num_subframes,
		      (mvm->trans->max_skb_frags - 1 -
		       skb_shinfo(skb)->nr_frags) / 2);

	/* This skb fits in one single A-MSDU */
	if (num_subframes * mss >= tcp_payload_len) {
701 702
		struct ieee80211_tx_info *skb_info = IEEE80211_SKB_CB(skb);

703 704 705 706 707 708 709 710 711 712 713
		/*
		 * Compute the length of all the data added for the A-MSDU.
		 * This will be used to compute the length to write in the TX
		 * command. We have: SNAP + IP + TCP for n -1 subframes and
		 * ETH header for n subframes. Note that the original skb
		 * already had one set of SNAP / IP / TCP headers.
		 */
		num_subframes = DIV_ROUND_UP(tcp_payload_len, mss);
		amsdu_add = num_subframes * sizeof(struct ethhdr) +
			(num_subframes - 1) * (snap_ip_tcp + pad);
		/* This holds the amsdu headers length */
714
		skb_info->driver_data[0] = (void *)(uintptr_t)amsdu_add;
715 716 717 718

		__skb_queue_tail(mpdus_skb, skb);
		return 0;
	}
719

720 721 722 723 724 725 726 727
	/*
	 * Trick the segmentation function to make it
	 * create SKBs that can fit into one A-MSDU.
	 */
segment:
	skb_shinfo(skb)->gso_size = num_subframes * mss;
	memcpy(cb, skb->cb, sizeof(cb));

728
	next = skb_gso_segment(skb, netdev_features);
729 730
	skb_shinfo(skb)->gso_size = mss;
	if (WARN_ON_ONCE(IS_ERR(next)))
731 732
		return -EINVAL;
	else if (next)
733
		consume_skb(skb);
734 735 736 737

	while (next) {
		tmp = next;
		next = tmp->next;
738

739
		memcpy(tmp->cb, cb, sizeof(tmp->cb));
740 741 742 743 744 745 746 747 748 749 750 751 752 753
		/*
		 * Compute the length of all the data added for the A-MSDU.
		 * This will be used to compute the length to write in the TX
		 * command. We have: SNAP + IP + TCP for n -1 subframes and
		 * ETH header for n subframes.
		 */
		tcp_payload_len = skb_tail_pointer(tmp) -
			skb_transport_header(tmp) -
			tcp_hdrlen(tmp) + tmp->data_len;

		if (ipv4)
			ip_hdr(tmp)->id = htons(ip_base_id + i * num_subframes);

		if (tcp_payload_len > mss) {
754 755 756
			struct ieee80211_tx_info *skb_info =
				IEEE80211_SKB_CB(tmp);

757 758 759
			num_subframes = DIV_ROUND_UP(tcp_payload_len, mss);
			amsdu_add = num_subframes * sizeof(struct ethhdr) +
				(num_subframes - 1) * (snap_ip_tcp + pad);
760 761
			skb_info->driver_data[0] =
				(void *)(uintptr_t)amsdu_add;
762 763
			skb_shinfo(tmp)->gso_size = mss;
		} else {
764
			qc = ieee80211_get_qos_ctl((void *)tmp->data);
765 766 767 768 769 770

			if (ipv4)
				ip_send_check(ip_hdr(tmp));
			*qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT;
			skb_shinfo(tmp)->gso_size = 0;
		}
771 772 773 774 775

		tmp->prev = NULL;
		tmp->next = NULL;

		__skb_queue_tail(mpdus_skb, tmp);
776
		i++;
777 778 779 780
	}

	return 0;
}
781 782
#else /* CONFIG_INET */
static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb,
783
			  struct ieee80211_tx_info *info,
784 785 786 787 788 789 790 791 792
			  struct ieee80211_sta *sta,
			  struct sk_buff_head *mpdus_skb)
{
	/* Impossible to get TSO with CONFIG_INET */
	WARN_ON(1);

	return -1;
}
#endif
793

794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822
static void iwl_mvm_tx_add_stream(struct iwl_mvm *mvm,
				  struct iwl_mvm_sta *mvm_sta, u8 tid,
				  struct sk_buff *skb)
{
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	u8 mac_queue = info->hw_queue;
	struct sk_buff_head *deferred_tx_frames;

	lockdep_assert_held(&mvm_sta->lock);

	mvm_sta->deferred_traffic_tid_map |= BIT(tid);
	set_bit(mvm_sta->sta_id, mvm->sta_deferred_frames);

	deferred_tx_frames = &mvm_sta->tid_data[tid].deferred_tx_frames;

	skb_queue_tail(deferred_tx_frames, skb);

	/*
	 * The first deferred frame should've stopped the MAC queues, so we
	 * should never get a second deferred frame for the RA/TID.
	 */
	if (!WARN(skb_queue_len(deferred_tx_frames) != 1,
		  "RATID %d/%d has %d deferred frames\n", mvm_sta->sta_id, tid,
		  skb_queue_len(deferred_tx_frames))) {
		iwl_mvm_stop_mac_queues(mvm, BIT(mac_queue));
		schedule_work(&mvm->add_stream_wk);
	}
}

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Johannes Berg 已提交
823 824 825
/*
 * Sets the fields in the Tx cmd that are crypto related
 */
826
static int iwl_mvm_tx_mpdu(struct iwl_mvm *mvm, struct sk_buff *skb,
827
			   struct ieee80211_tx_info *info,
828
			   struct ieee80211_sta *sta)
J
Johannes Berg 已提交
829 830 831 832 833 834 835 836 837
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	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;
838
	bool is_ampdu = false;
839
	int hdrlen;
J
Johannes Berg 已提交
840

841
	mvmsta = iwl_mvm_sta_from_mac80211(sta);
J
Johannes Berg 已提交
842
	fc = hdr->frame_control;
843
	hdrlen = ieee80211_hdrlen(fc);
J
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844 845 846 847

	if (WARN_ON_ONCE(!mvmsta))
		return -1;

848
	if (WARN_ON_ONCE(mvmsta->sta_id == IWL_MVM_STATION_COUNT))
J
Johannes Berg 已提交
849 850
		return -1;

851 852
	dev_cmd = iwl_mvm_set_tx_params(mvm, skb, info, hdrlen,
					sta, mvmsta->sta_id);
J
Johannes Berg 已提交
853 854 855 856 857 858
	if (!dev_cmd)
		goto drop;

	tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
	/* From now on, we cannot access info->control */

859 860 861 862 863 864 865
	/*
	 * we handle that entirely ourselves -- for uAPSD the firmware
	 * will always send a notification, and for PS-Poll responses
	 * we'll notify mac80211 when getting frame status
	 */
	info->flags &= ~IEEE80211_TX_STATUS_EOSP;

J
Johannes Berg 已提交
866 867 868 869 870 871 872 873 874 875 876 877 878 879
	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);
		is_ampdu = info->flags & IEEE80211_TX_CTL_AMPDU;
880 881 882 883 884 885 886
	} else if (iwl_mvm_is_dqa_supported(mvm) &&
		   (ieee80211_is_qos_nullfunc(fc) ||
		    ieee80211_is_nullfunc(fc))) {
		/*
		 * nullfunc frames should go to the MGMT queue regardless of QOS
		 */
		tid = IWL_MAX_TID_COUNT;
J
Johannes Berg 已提交
887 888
	}

889 890 891
	if (iwl_mvm_is_dqa_supported(mvm))
		txq_id = mvmsta->tid_data[tid].txq_id;

J
Johannes Berg 已提交
892
	/* Copy MAC header from skb into command buffer */
893
	memcpy(tx_cmd->hdr, hdr, hdrlen);
J
Johannes Berg 已提交
894 895 896

	WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM);

897 898 899 900 901 902 903
	if (sta->tdls) {
		/* default to TID 0 for non-QoS packets */
		u8 tdls_tid = tid == IWL_MAX_TID_COUNT ? 0 : tid;

		txq_id = mvmsta->hw_queue[tid_to_mac80211_ac[tdls_tid]];
	}

J
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904 905 906 907 908 909
	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;
	}

910 911 912 913 914 915
	/* Check if TXQ needs to be allocated or re-activated */
	if (unlikely(txq_id == IEEE80211_INVAL_HW_QUEUE ||
		     !mvmsta->tid_data[tid].is_tid_active) &&
	    iwl_mvm_is_dqa_supported(mvm)) {
		/* If TXQ needs to be allocated... */
		if (txq_id == IEEE80211_INVAL_HW_QUEUE) {
916 917 918 919 920 921 922 923 924
			iwl_mvm_tx_add_stream(mvm, mvmsta, tid, skb);

			/*
			 * The frame is now deferred, and the worker scheduled
			 * will re-allocate it, so we can free it for now.
			 */
			iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
			spin_unlock(&mvmsta->lock);
			return 0;
925

926 927
		}

928 929 930 931 932 933 934 935
		/* If we are here - TXQ exists and needs to be re-activated */
		spin_lock(&mvm->queue_info_lock);
		mvm->queue_info[txq_id].status = IWL_MVM_QUEUE_READY;
		mvmsta->tid_data[tid].is_tid_active = true;
		spin_unlock(&mvm->queue_info_lock);

		IWL_DEBUG_TX_QUEUES(mvm, "Re-activating queue %d for TX\n",
				    txq_id);
936 937
	}

938 939 940
	/* Keep track of the time of the last frame for this RA/TID */
	mvm->queue_info[txq_id].last_frame_time[tid] = jiffies;

J
Johannes Berg 已提交
941
	IWL_DEBUG_TX(mvm, "TX to [%d|%d] Q:%d - seq: 0x%x\n", mvmsta->sta_id,
942
		     tid, txq_id, IEEE80211_SEQ_TO_SN(seq_number));
J
Johannes Berg 已提交
943 944 945 946

	if (iwl_trans_tx(mvm->trans, skb, dev_cmd, txq_id))
		goto drop_unlock_sta;

947
	if (tid < IWL_MAX_TID_COUNT && !ieee80211_has_morefrags(fc))
948
		mvmsta->tid_data[tid].seq_number = seq_number + 0x10;
J
Johannes Berg 已提交
949 950 951

	spin_unlock(&mvmsta->lock);

952 953
	/* Increase pending frames count if this isn't AMPDU */
	if (!is_ampdu)
954
		atomic_inc(&mvm->pending_frames[mvmsta->sta_id]);
J
Johannes Berg 已提交
955 956 957 958 959 960 961 962 963 964

	return 0;

drop_unlock_sta:
	iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
	spin_unlock(&mvmsta->lock);
drop:
	return -1;
}

965 966 967 968
int iwl_mvm_tx_skb(struct iwl_mvm *mvm, struct sk_buff *skb,
		   struct ieee80211_sta *sta)
{
	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
969 970
	struct ieee80211_tx_info *skb_info = IEEE80211_SKB_CB(skb);
	struct ieee80211_tx_info info;
971 972 973 974 975 976 977 978 979 980
	struct sk_buff_head mpdus_skbs;
	unsigned int payload_len;
	int ret;

	if (WARN_ON_ONCE(!mvmsta))
		return -1;

	if (WARN_ON_ONCE(mvmsta->sta_id == IWL_MVM_STATION_COUNT))
		return -1;

981 982
	memcpy(&info, skb->cb, sizeof(info));

983
	/* This holds the amsdu headers length */
984
	skb_info->driver_data[0] = (void *)(uintptr_t)0;
985

986
	if (!skb_is_gso(skb))
987
		return iwl_mvm_tx_mpdu(mvm, skb, &info, sta);
988 989 990 991 992

	payload_len = skb_tail_pointer(skb) - skb_transport_header(skb) -
		tcp_hdrlen(skb) + skb->data_len;

	if (payload_len <= skb_shinfo(skb)->gso_size)
993
		return iwl_mvm_tx_mpdu(mvm, skb, &info, sta);
994 995 996

	__skb_queue_head_init(&mpdus_skbs);

997
	ret = iwl_mvm_tx_tso(mvm, skb, &info, sta, &mpdus_skbs);
998 999 1000 1001 1002 1003 1004
	if (ret)
		return ret;

	if (WARN_ON(skb_queue_empty(&mpdus_skbs)))
		return ret;

	while (!skb_queue_empty(&mpdus_skbs)) {
1005
		skb = __skb_dequeue(&mpdus_skbs);
1006

1007
		ret = iwl_mvm_tx_mpdu(mvm, skb, &info, sta);
1008 1009 1010 1011 1012 1013 1014 1015 1016
		if (ret) {
			__skb_queue_purge(&mpdus_skbs);
			return ret;
		}
	}

	return 0;
}

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static void iwl_mvm_check_ratid_empty(struct iwl_mvm *mvm,
				      struct ieee80211_sta *sta, u8 tid)
{
1020
	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
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	struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid];
	struct ieee80211_vif *vif = mvmsta->vif;

	lockdep_assert_held(&mvmsta->lock);

1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036
	if ((tid_data->state == IWL_AGG_ON ||
	     tid_data->state == IWL_EMPTYING_HW_QUEUE_DELBA) &&
	    iwl_mvm_tid_queued(tid_data) == 0) {
		/*
		 * Now that this aggregation queue is empty tell mac80211 so it
		 * knows we no longer have frames buffered for the station on
		 * this TID (for the TIM bitmap calculation.)
		 */
		ieee80211_sta_set_buffered(sta, tid, false);
	}

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	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);
1053 1054 1055
		iwl_mvm_disable_txq(mvm, tid_data->txq_id,
				    vif->hw_queue[tid_to_mac80211_ac[tid]], tid,
				    CMD_ASYNC);
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		tid_data->state = IWL_AGG_OFF;
		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 */

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void iwl_mvm_hwrate_to_tx_rate(u32 rate_n_flags,
1106
			       enum nl80211_band band,
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			       struct ieee80211_tx_rate *r)
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{
	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,
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							     band);
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	}
}

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/**
 * translate ucode response to mac80211 tx status control values
 */
static void iwl_mvm_hwrate_to_tx_status(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);
	iwl_mvm_hwrate_to_tx_rate(rate_n_flags, info->band, r);
}

1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184
static void iwl_mvm_tx_status_check_trigger(struct iwl_mvm *mvm,
					    u32 status)
{
	struct iwl_fw_dbg_trigger_tlv *trig;
	struct iwl_fw_dbg_trigger_tx_status *status_trig;
	int i;

	if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_TX_STATUS))
		return;

	trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_TX_STATUS);
	status_trig = (void *)trig->data;

	if (!iwl_fw_dbg_trigger_check_stop(mvm, NULL, trig))
		return;

	for (i = 0; i < ARRAY_SIZE(status_trig->statuses); i++) {
		/* don't collect on status 0 */
		if (!status_trig->statuses[i].status)
			break;

		if (status_trig->statuses[i].status != (status & TX_STATUS_MSK))
			continue;

		iwl_mvm_fw_dbg_collect_trig(mvm, trig,
					    "Tx status %d was received",
					    status & TX_STATUS_MSK);
		break;
	}
}

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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;
1200
	bool is_ndp = false;
1201
	bool txq_agg = false; /* Is this TXQ aggregated */
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	__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;
		}

1235 1236
		iwl_mvm_tx_status_check_trigger(mvm, status);

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		info->status.rates[0].count = tx_resp->failure_frame + 1;
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		iwl_mvm_hwrate_to_tx_status(le32_to_cpu(tx_resp->initial_rate),
					    info);
1240 1241
		info->status.status_driver_data[1] =
			(void *)(uintptr_t)le32_to_cpu(tx_resp->initial_rate);
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		/* Single frame failure in an AMPDU queue => send BAR */
1244
		if (txq_id >= mvm->first_agg_queue &&
1245 1246
		    !(info->flags & IEEE80211_TX_STAT_ACK) &&
		    !(info->flags & IEEE80211_TX_STAT_TX_FILTERED))
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			info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;

1249 1250
		/* W/A FW bug: seq_ctl is wrong when the status isn't success */
		if (status != TX_STATUS_SUCCESS) {
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			struct ieee80211_hdr *hdr = (void *)skb->data;
			seq_ctl = le16_to_cpu(hdr->seq_ctrl);
		}

1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268
		if (unlikely(!seq_ctl)) {
			struct ieee80211_hdr *hdr = (void *)skb->data;

			/*
			 * If it is an NDP, we can't update next_reclaim since
			 * its sequence control is 0. Note that for that same
			 * reason, NDPs are never sent to A-MPDU'able queues
			 * so that we can never have more than one freed frame
			 * for a single Tx resonse (see WARN_ON below).
			 */
			if (ieee80211_is_qos_nullfunc(hdr->frame_control))
				is_ndp = true;
		}

1269 1270 1271 1272 1273 1274
		/*
		 * TODO: this is not accurate if we are freeing more than one
		 * packet.
		 */
		info->status.tx_time =
			le16_to_cpu(tx_resp->wireless_media_time);
1275 1276 1277 1278
		BUILD_BUG_ON(ARRAY_SIZE(info->status.status_driver_data) < 1);
		info->status.status_driver_data[0] =
				(void *)(uintptr_t)tx_resp->reduced_tpc;

1279
		ieee80211_tx_status(mvm->hw, skb);
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	}

1282
	if (txq_id >= mvm->first_agg_queue) {
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		/* 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 */
1300
		next_reclaimed = IEEE80211_SEQ_TO_SN(seq_ctl + 0x10);
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	}

	IWL_DEBUG_TX_REPLY(mvm,
1304 1305 1306 1307 1308 1309
			   "TXQ %d status %s (0x%08x)\n",
			   txq_id, iwl_mvm_get_tx_fail_reason(status), status);

	IWL_DEBUG_TX_REPLY(mvm,
			   "\t\t\t\tinitial_rate 0x%x retries %d, idx=%d ssn=%d next_reclaimed=0x%x seq_ctl=0x%x\n",
			   le32_to_cpu(tx_resp->initial_rate),
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			   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]);
1316 1317 1318 1319 1320 1321
	/*
	 * sta can't be NULL otherwise it'd mean that the sta has been freed in
	 * the firmware while we still have packets for it in the Tx queues.
	 */
	if (WARN_ON_ONCE(!sta))
		goto out;
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1322

1323
	if (!IS_ERR(sta)) {
1324
		mvmsta = iwl_mvm_sta_from_mac80211(sta);
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		if (tid != IWL_TID_NON_QOS) {
			struct iwl_mvm_tid_data *tid_data =
				&mvmsta->tid_data[tid];
1329
			bool send_eosp_ndp = false;
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1330

1331
			spin_lock_bh(&mvmsta->lock);
1332 1333
			txq_agg = (mvmsta->tid_data[tid].state == IWL_AGG_ON);

1334 1335 1336 1337 1338 1339 1340 1341 1342 1343
			if (!is_ndp) {
				tid_data->next_reclaimed = next_reclaimed;
				IWL_DEBUG_TX_REPLY(mvm,
						   "Next reclaimed packet:%d\n",
						   next_reclaimed);
			} else {
				IWL_DEBUG_TX_REPLY(mvm,
						   "NDP - don't update next_reclaimed\n");
			}

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			iwl_mvm_check_ratid_empty(mvm, sta, tid);
1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366

			if (mvmsta->sleep_tx_count) {
				mvmsta->sleep_tx_count--;
				if (mvmsta->sleep_tx_count &&
				    !iwl_mvm_tid_queued(tid_data)) {
					/*
					 * The number of frames in the queue
					 * dropped to 0 even if we sent less
					 * frames than we thought we had on the
					 * Tx queue.
					 * This means we had holes in the BA
					 * window that we just filled, ask
					 * mac80211 to send EOSP since the
					 * firmware won't know how to do that.
					 * Send NDP and the firmware will send
					 * EOSP notification that will trigger
					 * a call to ieee80211_sta_eosp().
					 */
					send_eosp_ndp = true;
				}
			}

1367
			spin_unlock_bh(&mvmsta->lock);
1368 1369 1370 1371 1372 1373 1374
			if (send_eosp_ndp) {
				iwl_mvm_sta_modify_sleep_tx_count(mvm, sta,
					IEEE80211_FRAME_RELEASE_UAPSD,
					1, tid, false, false);
				mvmsta->sleep_tx_count = 0;
				ieee80211_send_eosp_nullfunc(sta, tid);
			}
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		}
1376 1377 1378 1379 1380

		if (mvmsta->next_status_eosp) {
			mvmsta->next_status_eosp = false;
			ieee80211_sta_eosp(sta);
		}
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	} else {
		mvmsta = NULL;
	}

	/*
	 * If the txq is not an AMPDU queue, there is no chance we freed
	 * several skbs. Check that out...
	 */
1389
	if (txq_agg)
1390 1391 1392
		goto out;

	/* We can't free more than one frame at once on a shared queue */
1393
	WARN_ON(!iwl_mvm_is_dqa_supported(mvm) && (skb_freed > 1));
1394

1395
	/* If we have still frames for this STA nothing to do here */
1396 1397 1398 1399
	if (!atomic_sub_and_test(skb_freed, &mvm->pending_frames[sta_id]))
		goto out;

	if (mvmsta && mvmsta->vif->type == NL80211_IFTYPE_AP) {
1400

1401
		/*
1402 1403 1404
		 * If there are no pending frames for this STA and
		 * the tx to this station is not disabled, notify
		 * mac80211 that this station can now wake up in its
1405 1406 1407
		 * STA table.
		 * If mvmsta is not NULL, sta is valid.
		 */
1408 1409 1410 1411 1412 1413 1414

		spin_lock_bh(&mvmsta->lock);

		if (!mvmsta->disable_tx)
			ieee80211_sta_block_awake(mvm->hw, sta, false);

		spin_unlock_bh(&mvmsta->lock);
1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425
	}

	if (PTR_ERR(sta) == -EBUSY || PTR_ERR(sta) == -ENOENT) {
		/*
		 * We are draining and this was the last packet - pre_rcu_remove
		 * has been called already. We might be after the
		 * synchronize_net already.
		 * Don't rely on iwl_mvm_rm_sta to see the empty Tx queues.
		 */
		set_bit(sta_id, mvm->sta_drained);
		schedule_work(&mvm->sta_drained_wk);
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	}

1428
out:
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1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486
	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);
1487
	struct iwl_mvm_sta *mvmsta;
1488
	int queue = SEQ_TO_QUEUE(sequence);
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1490 1491 1492
	if (WARN_ON_ONCE(queue < mvm->first_agg_queue &&
			 (!iwl_mvm_is_dqa_supported(mvm) ||
			  (queue != IWL_MVM_DQA_BSS_CLIENT_QUEUE))))
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		return;

	if (WARN_ON_ONCE(tid == IWL_TID_NON_QOS))
		return;

	iwl_mvm_rx_tx_cmd_agg_dbg(mvm, pkt);

	rcu_read_lock();

1502
	mvmsta = iwl_mvm_sta_from_staid_rcu(mvm, sta_id);
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1503

1504
	if (!WARN_ON_ONCE(!mvmsta)) {
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		mvmsta->tid_data[tid].rate_n_flags =
			le32_to_cpu(tx_resp->initial_rate);
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		mvmsta->tid_data[tid].tx_time =
			le16_to_cpu(tx_resp->wireless_media_time);
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	}

	rcu_read_unlock();
}

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void iwl_mvm_rx_tx_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
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{
	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);
}

1525 1526 1527 1528 1529 1530 1531 1532 1533
static void iwl_mvm_tx_info_from_ba_notif(struct ieee80211_tx_info *info,
					  struct iwl_mvm_ba_notif *ba_notif,
					  struct iwl_mvm_tid_data *tid_data)
{
	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_status(tid_data->rate_n_flags,
				    info);
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	/* TODO: not accounted if the whole A-MPDU failed */
	info->status.tx_time = tid_data->tx_time;
1536
	info->status.status_driver_data[0] =
1537
		(void *)(uintptr_t)ba_notif->reduced_txp;
1538 1539
	info->status.status_driver_data[1] =
		(void *)(uintptr_t)tid_data->rate_n_flags;
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}

1542
void iwl_mvm_rx_ba_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
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{
	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_sta *sta;
	struct iwl_mvm_sta *mvmsta;
	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;

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	if (WARN_ONCE(sta_id >= IWL_MVM_STATION_COUNT ||
		      tid >= IWL_MAX_TID_COUNT,
		      "sta_id %d tid %d", sta_id, tid))
1564
		return;
1565

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	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();
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		return;
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	}

1576
	mvmsta = iwl_mvm_sta_from_mac80211(sta);
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	tid_data = &mvmsta->tid_data[tid];

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	if (tid_data->txq_id != scd_flow) {
		IWL_ERR(mvm,
			"invalid BA notification: Q %d, tid %d, flow %d\n",
			tid_data->txq_id, tid, scd_flow);
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		rcu_read_unlock();
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		return;
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	}

1587
	spin_lock_bh(&mvmsta->lock);
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	__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);

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	IWL_DEBUG_TX_REPLY(mvm, "reduced txp from ba notif %d\n",
			   ba_notif->reduced_txp);
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	tid_data->next_reclaimed = ba_resp_scd_ssn;

	iwl_mvm_check_ratid_empty(mvm, sta, tid);

	freed = 0;

	skb_queue_walk(&reclaimed_skbs, skb) {
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		struct ieee80211_hdr *hdr = (void *)skb->data;
		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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		if (ieee80211_is_data_qos(hdr->frame_control))
			freed++;
		else
			WARN_ON_ONCE(1);

		iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]);

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		memset(&info->status, 0, sizeof(info->status));
		/* Packet was transmitted successfully, failures come as single
		 * frames because before failing a frame the firmware transmits
		 * it without aggregation at least once.
		 */
		info->flags |= IEEE80211_TX_STAT_ACK;

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		/* this is the first skb we deliver in this batch */
		/* put the rate scaling data there */
		if (freed == 1)
			iwl_mvm_tx_info_from_ba_notif(info, ba_notif, tid_data);
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	}

1642
	spin_unlock_bh(&mvmsta->lock);
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	/* We got a BA notif with 0 acked or scd_ssn didn't progress which is
	 * possible (i.e. first MPDU in the aggregation wasn't acked)
	 * Still it's important to update RS about sent vs. acked.
	 */
	if (skb_queue_empty(&reclaimed_skbs)) {
		struct ieee80211_tx_info ba_info = {};
		struct ieee80211_chanctx_conf *chanctx_conf = NULL;

		if (mvmsta->vif)
			chanctx_conf =
				rcu_dereference(mvmsta->vif->chanctx_conf);

		if (WARN_ON_ONCE(!chanctx_conf))
			goto out;

		ba_info.band = chanctx_conf->def.chan->band;
		iwl_mvm_tx_info_from_ba_notif(&ba_info, ba_notif, tid_data);

		IWL_DEBUG_TX_REPLY(mvm, "No reclaim. Update rs directly\n");
1663
		iwl_mvm_rs_tx_status(mvm, sta, tid, &ba_info, false);
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	}

out:
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	rcu_read_unlock();

	while (!skb_queue_empty(&reclaimed_skbs)) {
		skb = __skb_dequeue(&reclaimed_skbs);
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		ieee80211_tx_status(mvm->hw, skb);
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	}
}

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/*
 * Note that there are transports that buffer frames before they reach
 * the firmware. This means that after flush_tx_path is called, the
 * queue might not be empty. The race-free way to handle this is to:
 * 1) set the station as draining
 * 2) flush the Tx path
 * 3) wait for the transport queues to be empty
 */
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int iwl_mvm_flush_tx_path(struct iwl_mvm *mvm, u32 tfd_msk, u32 flags)
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{
	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),
	};

	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;
}