From nobody Wed Nov 27 06:43:35 2024 Received: from e2i340.smtp2go.com (e2i340.smtp2go.com [103.2.141.84]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4E36119580A for ; Sat, 12 Oct 2024 14:14:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=103.2.141.84 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728742451; cv=none; b=SFOaxabAPJaL36Tp6QZLhzaC2n2SDcfkkBdvM0P/fgo+yNMMjz/GnVwsHywvdVhMlut9E1EN+48w5nKZGdcb1xRcmbr95MEpznoP+mqA8YLM1WWf6McJA+ZzkrICs1fwY9rYc5Zn2MrpkTwdP4gRzRrbzNsCmOPoPbOks6HyiCs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728742451; c=relaxed/simple; bh=q9GWIqiHgLogny2tMksll/NXteKZKqVEZKIF4HbYo6Y=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=cy7yBaSM8n5N9RnUcDf1mill+jxotlk3F8zZT5Xc12PIEwtULXhFu/HpiyPT35j2o15+5rgg1tntm6/z0iTebxoamE3p5QieWCUp+v19FZsV8F8o7cgc3mA/r6VDsxwcRxxSwLStXTeQJIRlCj8c2meTcF79ABD/pOfSgPGylqk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=triplefau.lt; spf=pass smtp.mailfrom=em510616.triplefau.lt; dkim=pass (2048-bit key) header.d=smtpservice.net header.i=@smtpservice.net header.b=nXtQ3LSw; dkim=pass (2048-bit key) header.d=triplefau.lt header.i=@triplefau.lt header.b=Vf/3xic2; arc=none smtp.client-ip=103.2.141.84 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=triplefau.lt Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=em510616.triplefau.lt Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=smtpservice.net header.i=@smtpservice.net header.b="nXtQ3LSw"; dkim=pass (2048-bit key) header.d=triplefau.lt header.i=@triplefau.lt header.b="Vf/3xic2" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=smtpservice.net; s=maxzs0.a1-4.dyn; x=1728743349; h=Feedback-ID: X-Smtpcorp-Track:Message-Id:Date:Subject:To:From:Reply-To:Sender: List-Unsubscribe:List-Unsubscribe-Post; bh=ixfGgqFjjobcB6ENcsNj193mNxIb5LfMXGOC7kBenes=; b=nXtQ3LSwTi2U7tdb8c2nCre6uK sTZoHrM9xVmzwjGPPS6qc163DjrwBzNc3ygr4bwFetCl6m/vga1u0OW0vKjoLcqhvq9r/gl9wrd4R tzHWi8PcZYqXKJktJyXAkZL91TnGkOTgTlA6YSUB6RRZft1Mvj/zqAXgTv+9BAg0n5qefisg1AwT0 TpZLBJnC6U1MIz9BPQYhqlrJCDXslmxKraTir8EfyuURWHOCGYt1Wuc1vHnsicvqHVAjKwad5A6/m vcoQ489xC2nE81wDugYDdxg8LvT8DbeKkcUC4hzE74D5FiphEPKymSKgGD490WGlC1HnX4/J7i7I4 uOj5ssJw==; DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=triplefau.lt; i=@triplefau.lt; q=dns/txt; s=s510616; t=1728742449; h=from : subject : to : message-id : date; bh=ixfGgqFjjobcB6ENcsNj193mNxIb5LfMXGOC7kBenes=; b=Vf/3xic2kQQV/0Y+aH5tVUE7TQzyGlOB+RqgURmgb/0DRXw9d8zi6ZuVpbEHnYqmFMRvW +ifbKKyiFuvrXereYLd6uBSxyXLkZop/z24DfJxV7I2up2Pq4XQJP/bsScGq88Fl9HlgTnM GAfIcVq13hOD0jNIWNujY+gCyyPeEf6xWHg5G5h5GvRLXTWqCVyTF3ralgwJ/9D+rSvAqzL 12lZHY59wE8aFNgbsglRCpfuEcA8O8fCMTd7RAqauGTInEt0+MZMTp14fsJN6UuJis29Hhk /EAyZUB87LNLwtSkUqXsm/WL6RGQ4z0GVpuattADeGfnUusWjlh4DfGJXNHg== Received: from [10.139.162.187] (helo=SmtpCorp) by smtpcorp.com with esmtpsa (TLS1.3:ECDHE_SECP256R1__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.94.2-S2G) (envelope-from ) id 1szcsL-TRjz8V-B8; Sat, 12 Oct 2024 14:13:45 +0000 Received: from [10.12.239.196] (helo=localhost) by smtpcorp.com with esmtpsa (TLS1.3:ECDHE_SECP256R1__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.97.1-S2G) (envelope-from ) id 1szcsK-4o5NDgrqNZz-nw9B; Sat, 12 Oct 2024 14:13:44 +0000 From: Remi Pommarel To: ath10k@lists.infradead.org, linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Kalle Valo , Jeff Johnson , Cedric Veilleux , Remi Pommarel Subject: [PATCH 1/2] wifi: ath10k: Implement ieee80211 flush_sta callback Date: Sat, 12 Oct 2024 16:13:54 +0200 Message-Id: <481540132c62b16f6d823b7556c11a0ce68f5c58.1728741827.git.repk@triplefau.lt> X-Mailer: git-send-email 2.40.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Smtpcorp-Track: R_YpID9JRjZZ.Mw8ALi7XSI3T.T819AQhuwpR Feedback-ID: 510616m:510616apGKSTK:510616s8nGpsn1B8 X-Report-Abuse: Please forward a copy of this message, including all headers, to Content-Type: text/plain; charset="utf-8" When a STA reassociates, mac80211's _sta_info_move_state() waits for all pending frame to be flushed before removing the key (so that no frame get sent unencrypted after key removable [0]). When a driver does not implement the flush_sta callback, ieee80211_flush_queues() is called instead which effectively stops the whole queue until it is completely drained. The ath10k driver configure all STAs of one vdev to share the same queue. So when flushing one STA this is the whole vdev queue that is blocked until completely drained causing Tx to other STA to also stall this whole time. One easy way to reproduce the issue is to connect two STAs (STA0 and STA1) to an ath10k AP. While Generating a bunch of traffic from AP to STA0 (e.g. fping -l -p 20 ) disconnect STA0 from AP without clean disassociation (e.g. remove power, reboot -f). Then as soon as STA0 is effectively disconnected from AP (either after inactivity timeout or forced with iw dev AP station del STA0), its queues get flushed using ieee80211_flush_queues(). This causes STA1 to suffer a connectivity stall for about 5 seconds (see ATH10K_FLUSH_TIMEOUT_HZ). Implement a flush_sta callback in ath10k to wait only for a specific STA pending frames to be drained (without stopping the whole HW queue) to fix that. [0]: commit 0b75a1b1e42e ("wifi: mac80211: flush queues on STA removal") Reported-by: Cedric Veilleux Signed-off-by: Remi Pommarel --- drivers/net/wireless/ath/ath10k/core.h | 4 +++ drivers/net/wireless/ath/ath10k/htt.h | 4 +++ drivers/net/wireless/ath/ath10k/htt_tx.c | 32 ++++++++++++++++++ drivers/net/wireless/ath/ath10k/mac.c | 43 +++++++++++++++++++++++- drivers/net/wireless/ath/ath10k/txrx.c | 3 ++ 5 files changed, 85 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/ath/ath10k/core.h b/drivers/net/wireless/= ath/ath10k/core.h index 446dca74f06a..4709e4887efc 100644 --- a/drivers/net/wireless/ath/ath10k/core.h +++ b/drivers/net/wireless/ath/ath10k/core.h @@ -558,6 +558,10 @@ struct ath10k_sta { u8 rate_ctrl[ATH10K_TID_MAX]; u32 rate_code[ATH10K_TID_MAX]; int rtscts[ATH10K_TID_MAX]; + /* protects num_fw_queued */ + spinlock_t sta_tx_lock; + wait_queue_head_t empty_tx_wq; + unsigned int num_fw_queued; }; =20 #define ATH10K_VDEV_SETUP_TIMEOUT_HZ (5 * HZ) diff --git a/drivers/net/wireless/ath/ath10k/htt.h b/drivers/net/wireless/a= th/ath10k/htt.h index 603f6de62b0a..d150f9330941 100644 --- a/drivers/net/wireless/ath/ath10k/htt.h +++ b/drivers/net/wireless/ath/ath10k/htt.h @@ -2452,6 +2452,10 @@ int ath10k_htt_tx_inc_pending(struct ath10k_htt *htt= ); void ath10k_htt_tx_mgmt_dec_pending(struct ath10k_htt *htt); int ath10k_htt_tx_mgmt_inc_pending(struct ath10k_htt *htt, bool is_mgmt, bool is_presp); +void ath10k_htt_tx_sta_inc_pending(struct ath10k_htt *htt, + struct ieee80211_sta *sta); +void ath10k_htt_tx_sta_dec_pending(struct ath10k_htt *htt, + struct ieee80211_sta *sta); =20 int ath10k_htt_tx_alloc_msdu_id(struct ath10k_htt *htt, struct sk_buff *sk= b); void ath10k_htt_tx_free_msdu_id(struct ath10k_htt *htt, u16 msdu_id); diff --git a/drivers/net/wireless/ath/ath10k/htt_tx.c b/drivers/net/wireles= s/ath/ath10k/htt_tx.c index 9725feecefd6..7477cb8f5d10 100644 --- a/drivers/net/wireless/ath/ath10k/htt_tx.c +++ b/drivers/net/wireless/ath/ath10k/htt_tx.c @@ -195,6 +195,38 @@ void ath10k_htt_tx_mgmt_dec_pending(struct ath10k_htt = *htt) htt->num_pending_mgmt_tx--; } =20 +void ath10k_htt_tx_sta_inc_pending(struct ath10k_htt *htt, + struct ieee80211_sta *sta) +{ + struct ath10k_sta *arsta; + + if (!sta) + return; + + arsta =3D (struct ath10k_sta *)sta->drv_priv; + + spin_lock_bh(&arsta->sta_tx_lock); + arsta->num_fw_queued++; + spin_unlock_bh(&arsta->sta_tx_lock); +} + +void ath10k_htt_tx_sta_dec_pending(struct ath10k_htt *htt, + struct ieee80211_sta *sta) +{ + struct ath10k_sta *arsta; + + if (!sta) + return; + + arsta =3D (struct ath10k_sta *)sta->drv_priv; + + spin_lock_bh(&arsta->sta_tx_lock); + arsta->num_fw_queued--; + if (arsta->num_fw_queued =3D=3D 0) + wake_up(&arsta->empty_tx_wq); + spin_unlock_bh(&arsta->sta_tx_lock); +} + int ath10k_htt_tx_alloc_msdu_id(struct ath10k_htt *htt, struct sk_buff *sk= b) { struct ath10k *ar =3D htt->ar; diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/a= th/ath10k/mac.c index 646e1737d4c4..373a0aa6b01c 100644 --- a/drivers/net/wireless/ath/ath10k/mac.c +++ b/drivers/net/wireless/ath/ath10k/mac.c @@ -4423,6 +4423,8 @@ int ath10k_mac_tx_push_txq(struct ieee80211_hw *hw, spin_unlock_bh(&ar->htt.tx_lock); } =20 + ath10k_htt_tx_sta_inc_pending(&ar->htt, sta); + ret =3D ath10k_mac_tx(ar, vif, txmode, txpath, skb, false); if (unlikely(ret)) { ath10k_warn(ar, "failed to push frame: %d\n", ret); @@ -4432,6 +4434,7 @@ int ath10k_mac_tx_push_txq(struct ieee80211_hw *hw, if (is_mgmt) ath10k_htt_tx_mgmt_dec_pending(htt); spin_unlock_bh(&ar->htt.tx_lock); + ath10k_htt_tx_sta_dec_pending(&ar->htt, sta); =20 return ret; } @@ -7474,7 +7477,8 @@ static int ath10k_sta_state(struct ieee80211_hw *hw, arsta->peer_ps_state =3D WMI_PEER_PS_STATE_DISABLED; INIT_WORK(&arsta->update_wk, ath10k_sta_rc_update_wk); INIT_WORK(&arsta->tid_config_wk, ath10k_sta_tid_cfg_wk); - + spin_lock_init(&arsta->sta_tx_lock); + init_waitqueue_head(&arsta->empty_tx_wq); for (i =3D 0; i < ARRAY_SIZE(sta->txq); i++) ath10k_mac_txq_init(sta->txq[i]); } @@ -8098,6 +8102,42 @@ static void ath10k_flush(struct ieee80211_hw *hw, st= ruct ieee80211_vif *vif, mutex_unlock(&ar->conf_mutex); } =20 +static void ath10k_flush_sta(struct ieee80211_hw *hw, struct ieee80211_vif= *vif, + struct ieee80211_sta *sta) +{ + struct ath10k_sta *arsta =3D (struct ath10k_sta *)sta->drv_priv; + struct ath10k *ar =3D hw->priv; + bool skip; + long time_left; + + /* TODO do we need drop implemented here ? */ + + mutex_lock(&ar->conf_mutex); + + if (ar->state =3D=3D ATH10K_STATE_WEDGED) + goto out; + + time_left =3D wait_event_timeout(arsta->empty_tx_wq, ({ + bool empty; + + spin_lock_bh(&arsta->sta_tx_lock); + empty =3D (arsta->num_fw_queued =3D=3D 0); + spin_unlock_bh(&arsta->sta_tx_lock); + + skip =3D (ar->state =3D=3D ATH10K_STATE_WEDGED) || + test_bit(ATH10K_FLAG_CRASH_FLUSH, + &ar->dev_flags); + + (empty || skip); + }), ATH10K_FLUSH_TIMEOUT_HZ); + + if (time_left =3D=3D 0 || skip) + ath10k_warn(ar, "failed to flush sta txq (sta %pM skip %i ar-state %i): = %ld\n", + sta->addr, skip, ar->state, time_left); +out: + mutex_unlock(&ar->conf_mutex); +} + /* TODO: Implement this function properly * For now it is needed to reply to Probe Requests in IBSS mode. * Probably we need this information from FW. @@ -9444,6 +9484,7 @@ static const struct ieee80211_ops ath10k_ops =3D { .set_rts_threshold =3D ath10k_set_rts_threshold, .set_frag_threshold =3D ath10k_mac_op_set_frag_threshold, .flush =3D ath10k_flush, + .flush_sta =3D ath10k_flush_sta, .tx_last_beacon =3D ath10k_tx_last_beacon, .set_antenna =3D ath10k_set_antenna, .get_antenna =3D ath10k_get_antenna, diff --git a/drivers/net/wireless/ath/ath10k/txrx.c b/drivers/net/wireless/= ath/ath10k/txrx.c index da3bc35e41aa..ece56379b0f0 100644 --- a/drivers/net/wireless/ath/ath10k/txrx.c +++ b/drivers/net/wireless/ath/ath10k/txrx.c @@ -91,6 +91,9 @@ int ath10k_txrx_tx_unref(struct ath10k_htt *htt, skb_cb->airtime_est, 0); rcu_read_unlock(); =20 + if (txq) + ath10k_htt_tx_sta_dec_pending(htt, txq->sta); + if (ar->bus_param.dev_type !=3D ATH10K_DEV_TYPE_HL) dma_unmap_single(dev, skb_cb->paddr, msdu->len, DMA_TO_DEVICE); =20 --=20 2.40.0