tx.c 52.7 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 - 2017 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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 * Copyright(c) 2016 - 2017 Intel Deutschland 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))

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static u16 iwl_mvm_tx_csum(struct iwl_mvm *mvm, struct sk_buff *skb,
			   struct ieee80211_hdr *hdr,
			   struct ieee80211_tx_info *info)
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{
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	u16 offload_assist = 0;
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#if IS_ENABLED(CONFIG_INET)
	u16 mh_len = ieee80211_hdrlen(hdr->frame_control);
	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)
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		goto out;
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	/* 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);
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		goto out;
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	}

	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)) {
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			struct ipv6_opt_hdr *hp;

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			/* only supported extension headers */
			if (protocol != NEXTHDR_ROUTING &&
			    protocol != NEXTHDR_HOP &&
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			    protocol != NEXTHDR_DEST) {
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				skb_checksum_help(skb);
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				goto out;
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			}

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			hp = OPT_HDR(struct ipv6_opt_hdr, skb, off);
			protocol = hp->nexthdr;
			off += ipv6_optlen(hp);
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		}
		/* 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);
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		goto out;
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	}

	/* 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;

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out:
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#endif
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	return offload_assist;
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}

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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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{
	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);
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	/* Total # bytes to be transmitted - PCIe code will adjust for A-MSDU */
	tx_cmd->len = cpu_to_le16((u16)skb->len);
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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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	tx_cmd->offload_assist |=
		cpu_to_le16(iwl_mvm_tx_csum(mvm, skb, hdr, info));
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}

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static u32 iwl_mvm_get_tx_rate(struct iwl_mvm *mvm,
			       struct ieee80211_tx_info *info,
			       struct ieee80211_sta *sta)
{
	int rate_idx;
	u8 rate_plcp;
	u32 rate_flags;

	/* 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 (flags:0x%x/mcs:%d) for a non data frame\n",
		  info->control.rates[0].flags,
		  info->control.rates[0].idx);

	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 == NL80211_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);

	if (info->band == NL80211_BAND_2GHZ &&
	    !iwl_mvm_bt_coex_is_shared_ant_avail(mvm))
		rate_flags = mvm->cfg->non_shared_ant << RATE_MCS_ANT_POS;
	else
		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;

	return (u32)rate_plcp | rate_flags;
}

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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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{
	/* 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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	}

	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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	/* Set the rate in the TX cmd */
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	tx_cmd->rate_n_flags = cpu_to_le32(iwl_mvm_get_tx_rate(mvm, info, sta));
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}

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static inline void iwl_mvm_set_tx_cmd_pn(struct ieee80211_tx_info *info,
					 u8 *crypto_hdr)
{
	struct ieee80211_key_conf *keyconf = info->control.hw_key;
	u64 pn;

	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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/*
 * 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);
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		iwl_mvm_set_tx_cmd_pn(info, crypto_hdr);
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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;
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	case WLAN_CIPHER_SUITE_GCMP:
	case WLAN_CIPHER_SUITE_GCMP_256:
		/* TODO: Taking the key from the table might introduce a race
		 * when PTK rekeying is done, having an old packets with a PN
		 * based on the old key but the message encrypted with a new
		 * one.
		 * Need to handle this.
		 */
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		tx_cmd->sec_ctl |= TX_CMD_SEC_GCMP | TX_CMD_SEC_KEY_FROM_TABLE;
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		tx_cmd->key[0] = keyconf->hw_key_idx;
		iwl_mvm_set_tx_cmd_pn(info, crypto_hdr);
		break;
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	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;
	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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	return dev_cmd;
}

static void iwl_mvm_skb_prepare_status(struct sk_buff *skb,
				       struct iwl_device_cmd *cmd)
{
	struct ieee80211_tx_info *skb_info = IEEE80211_SKB_CB(skb);

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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] = cmd;
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}

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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))
		return info->hw_queue;

	switch (info->control.vif->type) {
	case NL80211_IFTYPE_AP:
		/*
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		 * Handle legacy hostapd as well, where station may be added
		 * only after assoc. Take care of the case where we send a
		 * deauth to a station that we don't have.
513
		 */
514 515
		if (ieee80211_is_probe_resp(fc) || ieee80211_is_auth(fc) ||
		    ieee80211_is_deauth(fc))
516
			return IWL_MVM_DQA_AP_PROBE_RESP_QUEUE;
517 518 519
		if (info->hw_queue == info->control.vif->cab_queue)
			return info->hw_queue;

520
		WARN_ONCE(1, "fc=0x%02x", le16_to_cpu(fc));
521 522 523
		return IWL_MVM_DQA_AP_PROBE_RESP_QUEUE;
	case NL80211_IFTYPE_P2P_DEVICE:
		if (ieee80211_is_mgmt(fc))
524
			return IWL_MVM_DQA_P2P_DEVICE_QUEUE;
525 526
		if (info->hw_queue == info->control.vif->cab_queue)
			return info->hw_queue;
527

528 529 530 531 532 533
		WARN_ON_ONCE(1);
		return IWL_MVM_DQA_P2P_DEVICE_QUEUE;
	default:
		WARN_ONCE(1, "Not a ctrl vif, no available queue\n");
		return -1;
	}
534 535
}

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536 537 538
int iwl_mvm_tx_skb_non_sta(struct iwl_mvm *mvm, struct sk_buff *skb)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
539 540
	struct ieee80211_tx_info *skb_info = IEEE80211_SKB_CB(skb);
	struct ieee80211_tx_info info;
J
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541 542 543
	struct iwl_device_cmd *dev_cmd;
	struct iwl_tx_cmd *tx_cmd;
	u8 sta_id;
544
	int hdrlen = ieee80211_hdrlen(hdr->frame_control);
545
	int queue;
J
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546

547 548 549 550 551
	/* 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
	 */
552
	if (skb_info->hw_queue == IWL_MVM_OFFCHANNEL_QUEUE &&
553
	    skb_info->control.vif->type == NL80211_IFTYPE_STATION)
554
		skb_info->hw_queue = mvm->aux_queue;
555

556 557 558
	memcpy(&info, skb->cb, sizeof(info));

	if (WARN_ON_ONCE(info.flags & IEEE80211_TX_CTL_AMPDU))
J
Johannes Berg 已提交
559 560
		return -1;

561 562 563
	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
564 565
		return -1;

566 567
	queue = info.hw_queue;

J
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568
	/*
569
	 * If the interface on which the frame is sent is the P2P_DEVICE
J
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570
	 * or an AP/GO interface use the broadcast station associated
571 572 573 574 575
	 * 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.
576 577 578 579
	 * In DQA mode, if vif is of type STATION and frames are not multicast
	 * or offchannel, they should be sent from the BSS queue.
	 * For example, TDLS setup frames should be sent on this queue,
	 * as they go through the AP.
J
Johannes Berg 已提交
580
	 */
581
	sta_id = mvm->aux_sta.sta_id;
582
	if (info.control.vif) {
J
Johannes Berg 已提交
583
		struct iwl_mvm_vif *mvmvif =
584
			iwl_mvm_vif_from_mac80211(info.control.vif);
585

586
		if (info.control.vif->type == NL80211_IFTYPE_P2P_DEVICE ||
587
		    info.control.vif->type == NL80211_IFTYPE_AP) {
588
			sta_id = mvmvif->bcast_sta.sta_id;
589 590
			queue = iwl_mvm_get_ctrl_vif_queue(mvm, &info,
							   hdr->frame_control);
591 592 593
			if (queue < 0)
				return -1;

594 595
		} else if (info.control.vif->type == NL80211_IFTYPE_STATION &&
			   is_multicast_ether_addr(hdr->addr1)) {
596 597 598 599
			u8 ap_sta_id = ACCESS_ONCE(mvmvif->ap_sta_id);

			if (ap_sta_id != IWL_MVM_STATION_COUNT)
				sta_id = ap_sta_id;
600
		} else if (iwl_mvm_is_dqa_supported(mvm) &&
601 602
			   info.control.vif->type == NL80211_IFTYPE_STATION &&
			   queue != mvm->aux_queue) {
603
			queue = IWL_MVM_DQA_BSS_CLIENT_QUEUE;
604
		}
J
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605 606
	}

607
	IWL_DEBUG_TX(mvm, "station Id %d, queue=%d\n", sta_id, queue);
J
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608

609
	dev_cmd = iwl_mvm_set_tx_params(mvm, skb, &info, hdrlen, NULL, sta_id);
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610 611 612
	if (!dev_cmd)
		return -1;

613 614 615
	/* From now on, we cannot access info->control */
	iwl_mvm_skb_prepare_status(skb, dev_cmd);

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616 617 618
	tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;

	/* Copy MAC header from skb into command buffer */
619
	memcpy(tx_cmd->hdr, hdr, hdrlen);
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620

621
	if (iwl_trans_tx(mvm->trans, skb, dev_cmd, queue)) {
J
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622 623 624 625
		iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
		return -1;
	}

626 627 628 629 630 631
	/*
	 * 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
632
	 * For DQA mode - we shouldn't increase it though
633
	 */
634 635
	if (!iwl_mvm_is_dqa_supported(mvm))
		atomic_inc(&mvm->pending_frames[sta_id]);
636

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637 638 639
	return 0;
}

640 641
#ifdef CONFIG_INET
static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb,
642
			  struct ieee80211_tx_info *info,
643 644 645
			  struct ieee80211_sta *sta,
			  struct sk_buff_head *mpdus_skb)
{
646
	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
647 648
	struct ieee80211_hdr *hdr = (void *)skb->data;
	unsigned int mss = skb_shinfo(skb)->gso_size;
649
	struct sk_buff *tmp, *next;
650
	char cb[sizeof(skb->cb)];
651
	unsigned int num_subframes, tcp_payload_len, subf_len, max_amsdu_len;
652 653
	bool ipv4 = (skb->protocol == htons(ETH_P_IP));
	u16 ip_base_id = ipv4 ? ntohs(ip_hdr(skb)->id) : 0;
654
	u16 snap_ip_tcp, pad, i = 0;
655
	unsigned int dbg_max_amsdu_len;
656
	netdev_features_t netdev_features = NETIF_F_CSUM_MASK | NETIF_F_SG;
657
	u8 *qc, tid, txf;
658 659 660 661

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

662 663 664 665 666
	qc = ieee80211_get_qos_ctl(hdr);
	tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
	if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
		return -EINVAL;

667 668
	dbg_max_amsdu_len = ACCESS_ONCE(mvm->max_amsdu_len);

669
	if (!sta->max_amsdu_len ||
670
	    !ieee80211_is_data_qos(hdr->frame_control) ||
671
	    (!mvmsta->tlc_amsdu && !dbg_max_amsdu_len)) {
672 673 674 675 676
		num_subframes = 1;
		pad = 0;
		goto segment;
	}

677 678 679 680 681 682 683 684 685 686 687 688 689
	/*
	 * 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;
	}

690 691 692 693 694 695
	/*
	 * 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) {
696 697 698 699 700
		num_subframes = 1;
		pad = 0;
		goto segment;
	}

701
	max_amsdu_len = sta->max_amsdu_len;
702 703 704 705 706 707 708 709 710 711 712 713 714

	/* 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);

715
	if (unlikely(dbg_max_amsdu_len))
716 717
		max_amsdu_len = min_t(unsigned int, max_amsdu_len,
				      dbg_max_amsdu_len);
718 719 720 721 722 723 724 725 726 727

	/*
	 * 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);

728 729 730 731 732 733 734 735
	/* 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.
	 */
736 737
	num_subframes = (max_amsdu_len + pad) / (subf_len + pad);
	if (num_subframes > 1)
738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758
		*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) {
		__skb_queue_tail(mpdus_skb, skb);
		return 0;
	}
759

760 761 762 763 764 765 766 767
	/*
	 * 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));

768
	next = skb_gso_segment(skb, netdev_features);
769 770
	skb_shinfo(skb)->gso_size = mss;
	if (WARN_ON_ONCE(IS_ERR(next)))
771 772
		return -EINVAL;
	else if (next)
773
		consume_skb(skb);
774 775 776 777

	while (next) {
		tmp = next;
		next = tmp->next;
778

779
		memcpy(tmp->cb, cb, sizeof(tmp->cb));
780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795
		/*
		 * 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) {
			skb_shinfo(tmp)->gso_size = mss;
		} else {
796
			qc = ieee80211_get_qos_ctl((void *)tmp->data);
797 798 799 800 801 802

			if (ipv4)
				ip_send_check(ip_hdr(tmp));
			*qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT;
			skb_shinfo(tmp)->gso_size = 0;
		}
803 804 805 806 807

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

		__skb_queue_tail(mpdus_skb, tmp);
808
		i++;
809 810 811 812
	}

	return 0;
}
813 814
#else /* CONFIG_INET */
static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb,
815
			  struct ieee80211_tx_info *info,
816 817 818 819 820 821 822 823 824
			  struct ieee80211_sta *sta,
			  struct sk_buff_head *mpdus_skb)
{
	/* Impossible to get TSO with CONFIG_INET */
	WARN_ON(1);

	return -1;
}
#endif
825

826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854
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);
	}
}

855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870
/* Check if there are any timed-out TIDs on a given shared TXQ */
static bool iwl_mvm_txq_should_update(struct iwl_mvm *mvm, int txq_id)
{
	unsigned long queue_tid_bitmap = mvm->queue_info[txq_id].tid_bitmap;
	unsigned long now = jiffies;
	int tid;

	for_each_set_bit(tid, &queue_tid_bitmap, IWL_MAX_TID_COUNT + 1) {
		if (time_before(mvm->queue_info[txq_id].last_frame_time[tid] +
				IWL_MVM_DQA_QUEUE_TIMEOUT, now))
			return true;
	}

	return false;
}

J
Johannes Berg 已提交
871 872 873
/*
 * Sets the fields in the Tx cmd that are crypto related
 */
874
static int iwl_mvm_tx_mpdu(struct iwl_mvm *mvm, struct sk_buff *skb,
875
			   struct ieee80211_tx_info *info,
876
			   struct ieee80211_sta *sta)
J
Johannes Berg 已提交
877 878 879 880 881 882 883 884 885
{
	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;
886
	bool is_ampdu = false;
887
	int hdrlen;
J
Johannes Berg 已提交
888

889
	mvmsta = iwl_mvm_sta_from_mac80211(sta);
J
Johannes Berg 已提交
890
	fc = hdr->frame_control;
891
	hdrlen = ieee80211_hdrlen(fc);
J
Johannes Berg 已提交
892 893 894 895

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

896
	if (WARN_ON_ONCE(mvmsta->sta_id == IWL_MVM_STATION_COUNT))
J
Johannes Berg 已提交
897 898
		return -1;

899 900
	dev_cmd = iwl_mvm_set_tx_params(mvm, skb, info, hdrlen,
					sta, mvmsta->sta_id);
J
Johannes Berg 已提交
901 902 903 904 905
	if (!dev_cmd)
		goto drop;

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

906 907 908 909 910 911 912
	/*
	 * 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
913 914
	spin_lock(&mvmsta->lock);

915 916 917 918
	/* nullfunc frames should go to the MGMT queue regardless of QOS,
	 * the condition of !ieee80211_is_qos_nullfunc(fc) keeps the default
	 * assignment of MGMT TID
	 */
J
Johannes Berg 已提交
919 920 921 922 923 924 925 926 927 928 929 930
	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;
931 932 933
		if (WARN_ON_ONCE(is_ampdu &&
				 mvmsta->tid_data[tid].state != IWL_AGG_ON))
			goto drop_unlock_sta;
J
Johannes Berg 已提交
934 935
	}

936
	if (iwl_mvm_is_dqa_supported(mvm) || is_ampdu)
937
		txq_id = mvmsta->tid_data[tid].txq_id;
938
	if (sta->tdls && !iwl_mvm_is_dqa_supported(mvm)) {
939 940 941 942 943 944
		/* 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]];
	}

945 946 947 948
	/* Copy MAC header from skb into command buffer */
	memcpy(tx_cmd->hdr, hdr, hdrlen);

	WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM);
J
Johannes Berg 已提交
949

950 951 952 953 954 955
	/* 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) {
956 957 958 959 960 961 962 963 964 965 966
			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;
		}

967 968 969 970 971 972 973 974
		/* 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);
975 976
	}

977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995
	if (iwl_mvm_is_dqa_supported(mvm)) {
		/* Keep track of the time of the last frame for this RA/TID */
		mvm->queue_info[txq_id].last_frame_time[tid] = jiffies;

		/*
		 * If we have timed-out TIDs - schedule the worker that will
		 * reconfig the queues and update them
		 *
		 * Note that the mvm->queue_info_lock isn't being taken here in
		 * order to not serialize the TX flow. This isn't dangerous
		 * because scheduling mvm->add_stream_wk can't ruin the state,
		 * and if we DON'T schedule it due to some race condition then
		 * next TX we get here we will.
		 */
		if (unlikely(mvm->queue_info[txq_id].status ==
			     IWL_MVM_QUEUE_SHARED &&
			     iwl_mvm_txq_should_update(mvm, txq_id)))
			schedule_work(&mvm->add_stream_wk);
	}
996

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Johannes Berg 已提交
997
	IWL_DEBUG_TX(mvm, "TX to [%d|%d] Q:%d - seq: 0x%x\n", mvmsta->sta_id,
998
		     tid, txq_id, IEEE80211_SEQ_TO_SN(seq_number));
J
Johannes Berg 已提交
999

1000 1001 1002
	/* From now on, we cannot access info->control */
	iwl_mvm_skb_prepare_status(skb, dev_cmd);

J
Johannes Berg 已提交
1003 1004 1005
	if (iwl_trans_tx(mvm->trans, skb, dev_cmd, txq_id))
		goto drop_unlock_sta;

1006
	if (tid < IWL_MAX_TID_COUNT && !ieee80211_has_morefrags(fc))
1007
		mvmsta->tid_data[tid].seq_number = seq_number + 0x10;
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	spin_unlock(&mvmsta->lock);

1011 1012
	/* Increase pending frames count if this isn't AMPDU or DQA queue */
	if (!iwl_mvm_is_dqa_supported(mvm) && !is_ampdu)
1013
		atomic_inc(&mvm->pending_frames[mvmsta->sta_id]);
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	return 0;

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

1024 1025 1026 1027
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);
1028
	struct ieee80211_tx_info info;
1029 1030 1031 1032 1033 1034 1035 1036 1037 1038
	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;

1039 1040
	memcpy(&info, skb->cb, sizeof(info));

1041
	if (!skb_is_gso(skb))
1042
		return iwl_mvm_tx_mpdu(mvm, skb, &info, sta);
1043 1044 1045 1046 1047

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

	if (payload_len <= skb_shinfo(skb)->gso_size)
1048
		return iwl_mvm_tx_mpdu(mvm, skb, &info, sta);
1049 1050 1051

	__skb_queue_head_init(&mpdus_skbs);

1052
	ret = iwl_mvm_tx_tso(mvm, skb, &info, sta, &mpdus_skbs);
1053 1054 1055 1056 1057 1058 1059
	if (ret)
		return ret;

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

	while (!skb_queue_empty(&mpdus_skbs)) {
1060
		skb = __skb_dequeue(&mpdus_skbs);
1061

1062
		ret = iwl_mvm_tx_mpdu(mvm, skb, &info, sta);
1063 1064 1065 1066 1067 1068 1069 1070 1071
		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)
{
1075
	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);

1081
	if ((tid_data->state == IWL_AGG_ON ||
1082 1083
	     tid_data->state == IWL_EMPTYING_HW_QUEUE_DELBA ||
	     iwl_mvm_is_dqa_supported(mvm)) &&
1084 1085
	    iwl_mvm_tid_queued(tid_data) == 0) {
		/*
1086 1087 1088
		 * Now that this aggregation or DQA 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.)
1089 1090 1091 1092
		 */
		ieee80211_sta_set_buffered(sta, tid, false);
	}

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1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108
	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);
1109 1110 1111 1112 1113 1114 1115
		if (!iwl_mvm_is_dqa_supported(mvm)) {
			u8 mac80211_ac = tid_to_mac80211_ac[tid];

			iwl_mvm_disable_txq(mvm, tid_data->txq_id,
					    vif->hw_queue[mac80211_ac], 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,
1166
			       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,
E
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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);
}

1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244
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;
1260
	bool is_ndp = false;
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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));

		/* 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:
1286 1287 1288 1289
			/* In DQA, the FW should have stopped the queue and not
			 * return this status
			 */
			WARN_ON(iwl_mvm_is_dqa_supported(mvm));
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			info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
			break;
		default:
			break;
		}

1296 1297
		iwl_mvm_tx_status_check_trigger(mvm, status);

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1298
		info->status.rates[0].count = tx_resp->failure_frame + 1;
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1299 1300
		iwl_mvm_hwrate_to_tx_status(le32_to_cpu(tx_resp->initial_rate),
					    info);
1301 1302
		info->status.status_driver_data[1] =
			(void *)(uintptr_t)le32_to_cpu(tx_resp->initial_rate);
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1303 1304

		/* Single frame failure in an AMPDU queue => send BAR */
1305
		if (info->flags & IEEE80211_TX_CTL_AMPDU &&
1306 1307
		    !(info->flags & IEEE80211_TX_STAT_ACK) &&
		    !(info->flags & IEEE80211_TX_STAT_TX_FILTERED))
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1308
			info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
1309
		info->flags &= ~IEEE80211_TX_CTL_AMPDU;
J
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1310

1311 1312
		/* W/A FW bug: seq_ctl is wrong when the status isn't success */
		if (status != TX_STATUS_SUCCESS) {
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1313 1314 1315 1316
			struct ieee80211_hdr *hdr = (void *)skb->data;
			seq_ctl = le16_to_cpu(hdr->seq_ctrl);
		}

1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330
		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;
		}

1331 1332 1333 1334 1335 1336
		/*
		 * 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);
1337 1338 1339 1340
		BUILD_BUG_ON(ARRAY_SIZE(info->status.status_driver_data) < 1);
		info->status.status_driver_data[0] =
				(void *)(uintptr_t)tx_resp->reduced_tpc;

1341
		ieee80211_tx_status(mvm->hw, skb);
J
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1342 1343
	}

1344
	if (iwl_mvm_is_dqa_supported(mvm) || txq_id >= mvm->first_agg_queue) {
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1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361
		/* 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 */
1362
		next_reclaimed = IEEE80211_SEQ_TO_SN(seq_ctl + 0x10);
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1363 1364 1365
	}

	IWL_DEBUG_TX_REPLY(mvm,
1366 1367 1368 1369 1370 1371
			   "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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1372 1373 1374 1375 1376 1377
			   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]);
1378 1379 1380 1381 1382 1383
	/*
	 * 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;
J
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1384

1385
	if (!IS_ERR(sta)) {
1386
		mvmsta = iwl_mvm_sta_from_mac80211(sta);
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1387 1388 1389 1390

		if (tid != IWL_TID_NON_QOS) {
			struct iwl_mvm_tid_data *tid_data =
				&mvmsta->tid_data[tid];
1391
			bool send_eosp_ndp = false;
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1392

1393
			spin_lock_bh(&mvmsta->lock);
1394

1395 1396 1397 1398 1399 1400 1401 1402 1403 1404
			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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1405
			iwl_mvm_check_ratid_empty(mvm, sta, tid);
1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427

			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;
				}
			}

1428
			spin_unlock_bh(&mvmsta->lock);
1429 1430 1431 1432 1433 1434 1435
			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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1436
		}
1437 1438 1439 1440 1441

		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...
	 */
1450
	if (iwl_mvm_is_dqa_supported(mvm) || txq_id >= mvm->first_agg_queue)
1451 1452 1453
		goto out;

	/* We can't free more than one frame at once on a shared queue */
1454
	WARN_ON(skb_freed > 1);
1455

1456
	/* If we have still frames for this STA nothing to do here */
1457 1458 1459 1460
	if (!atomic_sub_and_test(skb_freed, &mvm->pending_frames[sta_id]))
		goto out;

	if (mvmsta && mvmsta->vif->type == NL80211_IFTYPE_AP) {
1461

1462
		/*
1463 1464 1465
		 * 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
1466 1467 1468
		 * STA table.
		 * If mvmsta is not NULL, sta is valid.
		 */
1469 1470 1471 1472 1473 1474 1475

		spin_lock_bh(&mvmsta->lock);

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

		spin_unlock_bh(&mvmsta->lock);
1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486
	}

	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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1487 1488
	}

1489
out:
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1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547
	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);
1548
	struct iwl_mvm_sta *mvmsta;
1549
	int queue = SEQ_TO_QUEUE(sequence);
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1551 1552 1553
	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();

1563
	mvmsta = iwl_mvm_sta_from_staid_rcu(mvm, sta_id);
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1565
	if (!WARN_ON_ONCE(!mvmsta)) {
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		mvmsta->tid_data[tid].rate_n_flags =
			le32_to_cpu(tx_resp->initial_rate);
1568 1569
		mvmsta->tid_data[tid].tx_time =
			le16_to_cpu(tx_resp->wireless_media_time);
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	}

	rcu_read_unlock();
}

1575
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);
}

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static void iwl_mvm_tx_reclaim(struct iwl_mvm *mvm, int sta_id, int tid,
			       int txq, int index,
			       struct ieee80211_tx_info *ba_info, u32 rate)
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{
	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;
1595
	int freed;
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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))
1600
		return;
1601

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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();
1609
		return;
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	}

1612
	mvmsta = iwl_mvm_sta_from_mac80211(sta);
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	tid_data = &mvmsta->tid_data[tid];

1615
	if (tid_data->txq_id != txq) {
1616
		IWL_ERR(mvm,
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			"invalid BA notification: Q %d, tid %d\n",
			tid_data->txq_id, tid);
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		rcu_read_unlock();
1620
		return;
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	}

1623
	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).
	 */
1632
	iwl_trans_reclaim(mvm->trans, txq, index, &reclaimed_skbs);
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1634
	tid_data->next_reclaimed = index;
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	iwl_mvm_check_ratid_empty(mvm, sta, tid);

	freed = 0;
1639
	ba_info->status.status_driver_data[1] = (void *)(uintptr_t)rate;
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	skb_queue_walk(&reclaimed_skbs, skb) {
1642 1643
		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]);

1652 1653 1654 1655 1656 1657 1658
		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;

1659 1660
		/* this is the first skb we deliver in this batch */
		/* put the rate scaling data there */
1661 1662 1663 1664 1665 1666
		if (freed == 1) {
			info->flags |= IEEE80211_TX_STAT_AMPDU;
			memcpy(&info->status, &ba_info->status,
			       sizeof(ba_info->status));
			iwl_mvm_hwrate_to_tx_status(rate, info);
		}
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	}

1669
	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_chanctx_conf *chanctx_conf = NULL;

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

		if (WARN_ON_ONCE(!chanctx_conf))
			goto out;

1685 1686
		ba_info->band = chanctx_conf->def.chan->band;
		iwl_mvm_hwrate_to_tx_status(rate, ba_info);
1687 1688

		IWL_DEBUG_TX_REPLY(mvm, "No reclaim. Update rs directly\n");
1689
		iwl_mvm_rs_tx_status(mvm, sta, tid, ba_info, false);
1690 1691 1692
	}

out:
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	rcu_read_unlock();

	while (!skb_queue_empty(&reclaimed_skbs)) {
		skb = __skb_dequeue(&reclaimed_skbs);
1697
		ieee80211_tx_status(mvm->hw, skb);
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	}
}

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void iwl_mvm_rx_ba_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	int sta_id, tid, txq, index;
	struct ieee80211_tx_info ba_info = {};
	struct iwl_mvm_ba_notif *ba_notif;
	struct iwl_mvm_tid_data *tid_data;
	struct iwl_mvm_sta *mvmsta;

	if (iwl_mvm_has_new_tx_api(mvm)) {
		struct iwl_mvm_compressed_ba_notif *ba_res =
			(void *)pkt->data;

		sta_id = ba_res->sta_id;
		ba_info.status.ampdu_ack_len = (u8)le16_to_cpu(ba_res->done);
		ba_info.status.ampdu_len = (u8)le16_to_cpu(ba_res->txed);
		ba_info.status.tx_time =
			(u16)le32_to_cpu(ba_res->wireless_time);
		ba_info.status.status_driver_data[0] =
			(void *)(uintptr_t)ba_res->reduced_txp;

		/*
		 * TODO:
		 * When supporting multi TID aggregations - we need to move
		 * next_reclaimed to be per TXQ and not per TID or handle it
		 * in a different way.
		 * This will go together with SN and AddBA offload and cannot
		 * be handled properly for now.
		 */
		WARN_ON(le16_to_cpu(ba_res->tfd_cnt) != 1);
		iwl_mvm_tx_reclaim(mvm, sta_id, ba_res->ra_tid[0].tid,
				   (int)ba_res->tfd[0].q_num,
				   le16_to_cpu(ba_res->tfd[0].tfd_index),
				   &ba_info, le32_to_cpu(ba_res->tx_rate));

		IWL_DEBUG_TX_REPLY(mvm,
				   "BA_NOTIFICATION Received from sta_id = %d, flags %x, sent:%d, acked:%d\n",
				   sta_id, le32_to_cpu(ba_res->flags),
				   le16_to_cpu(ba_res->txed),
				   le16_to_cpu(ba_res->done));
		return;
	}

	ba_notif = (void *)pkt->data;
	sta_id = ba_notif->sta_id;
	tid = ba_notif->tid;
	/* "flow" corresponds to Tx queue */
	txq = 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 */
	index = le16_to_cpu(ba_notif->scd_ssn);

	rcu_read_lock();
	mvmsta = iwl_mvm_sta_from_staid_rcu(mvm, sta_id);
	if (WARN_ON_ONCE(!mvmsta)) {
		rcu_read_unlock();
		return;
	}

	tid_data = &mvmsta->tid_data[tid];

	ba_info.status.ampdu_ack_len = ba_notif->txed_2_done;
	ba_info.status.ampdu_len = ba_notif->txed;
	ba_info.status.tx_time = tid_data->tx_time;
	ba_info.status.status_driver_data[0] =
		(void *)(uintptr_t)ba_notif->reduced_txp;

	rcu_read_unlock();

	iwl_mvm_tx_reclaim(mvm, sta_id, tid, txq, index, &ba_info,
			   tid_data->rate_n_flags);

	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),
			   le64_to_cpu(ba_notif->bitmap), txq, index,
			   ba_notif->txed, ba_notif->txed_2_done);

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

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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
 */
1795
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;
}