From patchwork Fri Oct 11 02:24:12 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kan Yan X-Patchwork-Id: 11184781 X-Patchwork-Delegate: johannes@sipsolutions.net Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 966071668 for ; Fri, 11 Oct 2019 02:24:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 537D7214E0 for ; Fri, 11 Oct 2019 02:24:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="VMr258Xj" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728073AbfJKCYY (ORCPT ); Thu, 10 Oct 2019 22:24:24 -0400 Received: from mail-pg1-f201.google.com ([209.85.215.201]:49608 "EHLO mail-pg1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727854AbfJKCYX (ORCPT ); Thu, 10 Oct 2019 22:24:23 -0400 Received: by mail-pg1-f201.google.com with SMTP id l6so5827468pgq.16 for ; Thu, 10 Oct 2019 19:24:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=iy3/2CPaGQldv0uXX/s6G4YvrAYLLpvHAwubBPa9QCA=; b=VMr258XjekpKCGS+3nfj73PHFx1hLF/ASpq9nZOeVgkYBNoNm1vEVI5xG+OSM5OWeq Kf0aNGphwamukpF2YfBtxlgShVAvGxS3aBqgGUWxBjpuPI8RMWKFsBuHxnoiI9YNKAxf taY6NGkshcYJdrE8PtSzouANc0nVTgtnU3WzL9vF3VBY/PT05rBtuq00DUOMrDuoXiyT 7fmaxPvFQAEL0I9i9dFERw7VOqc2muem0DTu+nZbsF433CgyQa7HAG/ab+1AQxpjpHr7 Dq20CY0pI6SmqrgadJjj2178Hu9R9AhcTvar0UZEXKz4htmW3cVo04zwJ7BPVsArbOB8 8gFA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=iy3/2CPaGQldv0uXX/s6G4YvrAYLLpvHAwubBPa9QCA=; b=X9l59ztbwyYow1bzSmvih8BEQPyEBidne2hpXYvdD95Af8EY13xKqNCTN/rvjj5xPU BqmQkgor28mF12GklMrE+w/LexHOwvaRjGijAeRReNuRHf1wzRy+TFjPowKeyBLfwzsw GTSMNoT66P9DDKSuW7AYYliKRb372493mt78KgH729qWQ1maBGnYfqSBotHAhn5HF6PL cjS3ut7w6lrN+C0ULpUja5o99DvGnpoCnlbDg6nmBKZU/t068EM0A31nyQtKQuaiApBl /I27rP1JXRiBfcUFDr2FAGbJy2j+Gs/KhK7osqmR8n+pvBEicR8938bRl3CdWlqc1w2V vFnw== X-Gm-Message-State: APjAAAVKMfDFax+1o1P0Ii4g4knr/MJ0Lg4EP1k31DesKXQsenmsB3GQ mBjx46c0kv46rhKi6XGCD2I54R1I X-Google-Smtp-Source: APXvYqz29DqwTTe1UnQqgxi1MlDTssmPESGpdvLxWdQDigWZNzUADHNzvKsGKpFZchY/+RPNnvEKuOP0 X-Received: by 2002:a65:5c45:: with SMTP id v5mr13882982pgr.82.1570760660700; Thu, 10 Oct 2019 19:24:20 -0700 (PDT) Date: Thu, 10 Oct 2019 19:24:12 -0700 In-Reply-To: <20191011022413.176208-1-kyan@google.com> Message-Id: <20191011022413.176208-2-kyan@google.com> Mime-Version: 1.0 References: <20191011022413.176208-1-kyan@google.com> X-Mailer: git-send-email 2.23.0.700.g56cf767bdb-goog Subject: [PATCH v4 1/2] mac80211: Implement Airtime-based Queue Limit (AQL) From: Kan Yan To: johannes@sipsolutions.net Cc: linux-wireless@vger.kernel.org, make-wifi-fast@lists.bufferbloat.net, toke@redhat.com, nbd@nbd.name, ath10k@lists.infradead.org, yiboz@codeaurora.org, Kan Yan Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org In order for the Fq_CoDel integrated in mac80211 layer operates effectively to control excessive queueing latency, the CoDel algorithm requires an accurate measure of how long the packets stays in the queue, aka sojourn time. The sojourn time measured at mac80211 layer doesn't include queueing latency in lower layer (firmware/hardware) and CoDel expects lower layer to have a short queue. However, most 802.11ac chipsets offload tasks such TX aggregation to firmware or hardware, thus have a deep lower layer queue. Without a mechanism to control the lower layer queue size, packets only stays in mac80211 layer transiently before being sent to firmware queue. As a result, the sojourn time measured by CoDel in the mac80211 layer is almost always lower than the CoDel latency target, hence CoDel does little to control the latency, even when the lower layer queue causes excessive latency. Byte Queue limits (BQL) is commonly used to address the similar issue with wired network interface. However, this method cannot be applied directly to the wireless network interface. Byte is not a suitable measure of queue depth in the wireless network, as the data rate can vary dramatically from station to station in the same network, from a few Mbps to over Gbps. This patch implemented an Airtime-based Queue Limit (AQL) to make CoDel works effectively with wireless drivers that utilized firmware/hardware offloading. AQL only allows each txq to release just enough packets to the lower layer to form 1-2 large aggregations to keep hardware fully utilized and keep the rest of frames in mac80211 layer to be controlled by the CoDel algorithm. Signed-off-by: Kan Yan --- include/net/cfg80211.h | 7 ++++ include/net/mac80211.h | 47 +++++++++++++++++++++++ net/mac80211/debugfs.c | 78 ++++++++++++++++++++++++++++++++++++++ net/mac80211/debugfs_sta.c | 43 ++++++++++++++++----- net/mac80211/ieee80211_i.h | 4 ++ net/mac80211/main.c | 9 ++++- net/mac80211/sta_info.c | 33 ++++++++++++++++ net/mac80211/sta_info.h | 4 ++ net/mac80211/tx.c | 46 ++++++++++++++++++++-- 9 files changed, 257 insertions(+), 14 deletions(-) diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h index 26e2ad2c7027..781cf4f2daa3 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -2499,6 +2499,13 @@ enum wiphy_params_flags { #define IEEE80211_DEFAULT_AIRTIME_WEIGHT 256 +/* The per TXQ device queue limit in airtime */ +#define IEEE80211_DEFAULT_AQL_TXQ_LIMIT_L 4000 +#define IEEE80211_DEFAULT_AQL_TXQ_LIMIT_H 8000 + +/* The per interface airtime threshold to switch to lower queue limit */ +#define IEEE80211_AQL_THRESHOLD 24000 + /** * struct cfg80211_pmksa - PMK Security Association * diff --git a/include/net/mac80211.h b/include/net/mac80211.h index d26da013f7c0..65dd99974165 100644 --- a/include/net/mac80211.h +++ b/include/net/mac80211.h @@ -5543,6 +5543,53 @@ void ieee80211_send_eosp_nullfunc(struct ieee80211_sta *pubsta, int tid); void ieee80211_sta_register_airtime(struct ieee80211_sta *pubsta, u8 tid, u32 tx_airtime, u32 rx_airtime); +/** + * ieee80211_sta_update_pending_airtime - update txq's estimated airtime + * + * Update the estimated total airtime of frames queued in device. + * + * The pending airtime is used to enforce queue limit by AQL to prevent too + * many packets get queued in the device. The airtime can be estimated from the + * station's current data rate and stored in the frame's CB field. + * ieee80211_sta_register_pending_airtime() should be called to increment the + * pending airtime when a frame is sent to device. The same amount of airtime + * should be subtracted by calling ieee80211_sta_release_pending_airtime() when + * a frame is completed, either successfully transmitted or failed. + * + * @pubsta: the station + * @tid: the TID to update airtime for + * @tx_airtime: the estimated airtime (in usec) + */ +void ieee80211_sta_update_pending_airtime(struct ieee80211_sta *pubsta, + u8 tid, u32 tx_airtime, + bool tx_completed); + +static inline void +ieee80211_sta_register_pending_airtime(struct ieee80211_sta *pubsta, + u8 tid, u32 tx_airtime) +{ + ieee80211_sta_update_pending_airtime(pubsta, tid, tx_airtime, false); +} + +static inline void +ieee80211_sta_release_pending_airtime(struct ieee80211_sta *pubsta, + u8 tid, u32 tx_airtime) +{ + ieee80211_sta_update_pending_airtime(pubsta, tid, tx_airtime, true); +} + +/** + * ieee80211_txq_airtime_check - check if a txq can send frame to device + * + * @hw: pointer obtained from ieee80211_alloc_hw() + * @txq: pointer obtained from station or virtual interface + * + * Return true if the AQL's airtime limit has not been reached and the txq can + * continue to send more packets to the device. Otherwise return false. + */ +bool +ieee80211_txq_airtime_check(struct ieee80211_hw *hw, struct ieee80211_txq *txq); + /** * ieee80211_iter_keys - iterate keys programmed into the device * @hw: pointer obtained from ieee80211_alloc_hw() diff --git a/net/mac80211/debugfs.c b/net/mac80211/debugfs.c index 2e7f75938c51..ad7bcda1e025 100644 --- a/net/mac80211/debugfs.c +++ b/net/mac80211/debugfs.c @@ -148,6 +148,80 @@ static const struct file_operations aqm_ops = { .llseek = default_llseek, }; +static ssize_t aql_txq_limit_read(struct file *file, + char __user *user_buf, + size_t count, + loff_t *ppos) +{ + struct ieee80211_local *local = file->private_data; + char buf[400]; + int len = 0; + + len = scnprintf(buf, sizeof(buf), + "AC AQL limit low AQL limit high\n" + "VO %u %u\n" + "VI %u %u\n" + "BE %u %u\n" + "BK %u %u\n", + local->aql_txq_limit_low[IEEE80211_AC_VO], + local->aql_txq_limit_high[IEEE80211_AC_VO], + local->aql_txq_limit_low[IEEE80211_AC_VI], + local->aql_txq_limit_high[IEEE80211_AC_VI], + local->aql_txq_limit_low[IEEE80211_AC_BE], + local->aql_txq_limit_high[IEEE80211_AC_BE], + local->aql_txq_limit_low[IEEE80211_AC_BK], + local->aql_txq_limit_high[IEEE80211_AC_BK]); + return simple_read_from_buffer(user_buf, count, ppos, + buf, len); +} + +static ssize_t aql_txq_limit_write(struct file *file, + const char __user *user_buf, + size_t count, + loff_t *ppos) +{ + struct ieee80211_local *local = file->private_data; + char buf[100]; + size_t len; + u32 ac, q_limit_low, q_limit_high; + struct sta_info *sta; + + if (count > sizeof(buf)) + return -EINVAL; + + if (copy_from_user(buf, user_buf, count)) + return -EFAULT; + + buf[sizeof(buf) - 1] = 0; + len = strlen(buf); + if (len > 0 && buf[len - 1] == '\n') + buf[len - 1] = 0; + + if (sscanf(buf, "%u %u %u", &ac, &q_limit_low, &q_limit_high) != 3) + return -EINVAL; + + if (ac >= IEEE80211_NUM_ACS) + return -EINVAL; + + local->aql_txq_limit_low[ac] = q_limit_low; + local->aql_txq_limit_high[ac] = q_limit_high; + + mutex_lock(&local->sta_mtx); + list_for_each_entry(sta, &local->sta_list, list) { + sta->airtime[ac].aql_limit_low = q_limit_low; + sta->airtime[ac].aql_limit_high = q_limit_high; + } + mutex_unlock(&local->sta_mtx); + return count; +} + +static const struct file_operations aql_txq_limit_ops = { + .write = aql_txq_limit_write, + .read = aql_txq_limit_read, + .open = simple_open, + .llseek = default_llseek, +}; + static ssize_t force_tx_status_read(struct file *file, char __user *user_buf, size_t count, @@ -442,6 +516,10 @@ void debugfs_hw_add(struct ieee80211_local *local) debugfs_create_u16("airtime_flags", 0600, phyd, &local->airtime_flags); + DEBUGFS_ADD(aql_txq_limit); + debugfs_create_u32("aql_threshold", 0600, + phyd, &local->aql_threshold); + statsd = debugfs_create_dir("statistics", phyd); /* if the dir failed, don't put all the other things into the root! */ diff --git a/net/mac80211/debugfs_sta.c b/net/mac80211/debugfs_sta.c index c8ad20c28c43..9f9b8f5ed86a 100644 --- a/net/mac80211/debugfs_sta.c +++ b/net/mac80211/debugfs_sta.c @@ -197,10 +197,12 @@ static ssize_t sta_airtime_read(struct file *file, char __user *userbuf, { struct sta_info *sta = file->private_data; struct ieee80211_local *local = sta->sdata->local; - size_t bufsz = 200; + size_t bufsz = 400; char *buf = kzalloc(bufsz, GFP_KERNEL), *p = buf; u64 rx_airtime = 0, tx_airtime = 0; s64 deficit[IEEE80211_NUM_ACS]; + u32 q_depth[IEEE80211_NUM_ACS]; + u32 q_limit_l[IEEE80211_NUM_ACS], q_limit_h[IEEE80211_NUM_ACS]; ssize_t rv; int ac; @@ -212,19 +214,22 @@ static ssize_t sta_airtime_read(struct file *file, char __user *userbuf, rx_airtime += sta->airtime[ac].rx_airtime; tx_airtime += sta->airtime[ac].tx_airtime; deficit[ac] = sta->airtime[ac].deficit; + q_limit_l[ac] = sta->airtime[ac].aql_limit_low; + q_limit_h[ac] = sta->airtime[ac].aql_limit_high; + q_depth[ac] = sta->airtime[ac].aql_tx_pending; spin_unlock_bh(&local->active_txq_lock[ac]); } p += scnprintf(p, bufsz + buf - p, "RX: %llu us\nTX: %llu us\nWeight: %u\n" - "Deficit: VO: %lld us VI: %lld us BE: %lld us BK: %lld us\n", - rx_airtime, - tx_airtime, - sta->airtime_weight, - deficit[0], - deficit[1], - deficit[2], - deficit[3]); + "Deficit: VO: %lld us VI: %lld us BE: %lld us BK: %lld us\n" + "Q depth: VO: %u us VI: %u us BE: %u us BK: %u us\n" + "Q limit[low/high]: VO: %u/%u VI: %u/%u BE: %u/%u BK: %u/%u\n", + rx_airtime, tx_airtime, sta->airtime_weight, + deficit[0], deficit[1], deficit[2], deficit[3], + q_depth[0], q_depth[1], q_depth[2], q_depth[3], + q_limit_l[0], q_limit_h[0], q_limit_l[1], q_limit_h[1], + q_limit_l[2], q_limit_h[2], q_limit_l[3], q_limit_h[3]), rv = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf); kfree(buf); @@ -236,7 +241,25 @@ static ssize_t sta_airtime_write(struct file *file, const char __user *userbuf, { struct sta_info *sta = file->private_data; struct ieee80211_local *local = sta->sdata->local; - int ac; + u32 ac, q_limit_l, q_limit_h; + char _buf[100] = {}, *buf = _buf; + + if (count > sizeof(_buf)) + return -EINVAL; + + if (copy_from_user(buf, userbuf, count)) + return -EFAULT; + + buf[sizeof(_buf) - 1] = '\0'; + if (sscanf(buf, "queue limit %u %u %u", &ac, &q_limit_l, &q_limit_h) + != 3) + return -EINVAL; + + if (ac >= IEEE80211_NUM_ACS) + return -EINVAL; + + sta->airtime[ac].aql_limit_low = q_limit_l; + sta->airtime[ac].aql_limit_high = q_limit_h; for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { spin_lock_bh(&local->active_txq_lock[ac]); diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index 004e2e3adb88..1d2b6f6f745c 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -1142,6 +1142,10 @@ struct ieee80211_local { u16 schedule_round[IEEE80211_NUM_ACS]; u16 airtime_flags; + u32 aql_txq_limit_low[IEEE80211_NUM_ACS]; + u32 aql_txq_limit_high[IEEE80211_NUM_ACS]; + u32 aql_threshold; + u32 aql_total_pending_airtime; const struct ieee80211_ops *ops; diff --git a/net/mac80211/main.c b/net/mac80211/main.c index 4c2702f128f3..dcbcd0f85a86 100644 --- a/net/mac80211/main.c +++ b/net/mac80211/main.c @@ -666,8 +666,15 @@ struct ieee80211_hw *ieee80211_alloc_hw_nm(size_t priv_data_len, for (i = 0; i < IEEE80211_NUM_ACS; i++) { INIT_LIST_HEAD(&local->active_txqs[i]); spin_lock_init(&local->active_txq_lock[i]); + local->aql_txq_limit_low[i] = IEEE80211_DEFAULT_AQL_TXQ_LIMIT_L; + local->aql_txq_limit_high[i] = + IEEE80211_DEFAULT_AQL_TXQ_LIMIT_H; } - local->airtime_flags = AIRTIME_USE_TX | AIRTIME_USE_RX; + + local->airtime_flags = AIRTIME_USE_TX | + AIRTIME_USE_RX | + AIRTIME_USE_AQL; + local->aql_threshold = IEEE80211_AQL_THRESHOLD; INIT_LIST_HEAD(&local->chanctx_list); mutex_init(&local->chanctx_mtx); diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c index 95eb8220e2e4..e8a7c250e7b5 100644 --- a/net/mac80211/sta_info.c +++ b/net/mac80211/sta_info.c @@ -396,6 +396,9 @@ struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata, skb_queue_head_init(&sta->ps_tx_buf[i]); skb_queue_head_init(&sta->tx_filtered[i]); sta->airtime[i].deficit = sta->airtime_weight; + sta->airtime[i].aql_tx_pending = 0; + sta->airtime[i].aql_limit_low = local->aql_txq_limit_low[i]; + sta->airtime[i].aql_limit_high = local->aql_txq_limit_high[i]; } for (i = 0; i < IEEE80211_NUM_TIDS; i++) @@ -1894,6 +1897,36 @@ void ieee80211_sta_register_airtime(struct ieee80211_sta *pubsta, u8 tid, } EXPORT_SYMBOL(ieee80211_sta_register_airtime); +void ieee80211_sta_update_pending_airtime(struct ieee80211_sta *pubsta, u8 tid, + u32 tx_airtime, bool tx_completed) +{ + u8 ac = ieee80211_ac_from_tid(tid); + struct sta_info *sta = container_of(pubsta, struct sta_info, sta); + struct ieee80211_local *local = sta->local; + + spin_lock_bh(&local->active_txq_lock[ac]); + if (tx_completed) { + if (WARN_ONCE(sta->airtime[ac].aql_tx_pending < tx_airtime, + "TXQ pending airtime underflow: %u, %u", + sta->airtime[ac].aql_tx_pending, tx_airtime)) + sta->airtime[ac].aql_tx_pending = 0; + else + sta->airtime[ac].aql_tx_pending -= tx_airtime; + + if (WARN_ONCE(local->aql_total_pending_airtime < tx_airtime, + "Device pending airtime underflow: %u, %u", + local->aql_total_pending_airtime, tx_airtime)) + local->aql_total_pending_airtime = 0; + else + local->aql_total_pending_airtime -= tx_airtime; + } else { + sta->airtime[ac].aql_tx_pending += tx_airtime; + local->aql_total_pending_airtime += tx_airtime; + } + spin_unlock_bh(&local->active_txq_lock[ac]); +} +EXPORT_SYMBOL(ieee80211_sta_update_pending_airtime); + int sta_info_move_state(struct sta_info *sta, enum ieee80211_sta_state new_state) { diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h index 3260d4234920..6ce252407b19 100644 --- a/net/mac80211/sta_info.h +++ b/net/mac80211/sta_info.h @@ -127,11 +127,15 @@ enum ieee80211_agg_stop_reason { /* Debugfs flags to enable/disable use of RX/TX airtime in scheduler */ #define AIRTIME_USE_TX BIT(0) #define AIRTIME_USE_RX BIT(1) +#define AIRTIME_USE_AQL BIT(2) struct airtime_info { u64 rx_airtime; u64 tx_airtime; s64 deficit; + u32 aql_tx_pending; /* Estimated airtime for frames pending in queue */ + u32 aql_limit_low; + u32 aql_limit_high; }; struct sta_info; diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index f13eb2f61ccf..5f6cb4caa114 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -3669,7 +3669,8 @@ struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) { struct ieee80211_local *local = hw_to_local(hw); struct ieee80211_txq *ret = NULL; - struct txq_info *txqi = NULL; + struct txq_info *txqi = NULL, *head = NULL; + bool found_eligible_txq = false; spin_lock_bh(&local->active_txq_lock[ac]); @@ -3680,13 +3681,26 @@ struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) if (!txqi) goto out; + if (txqi == head && !found_eligible_txq) + goto out; + + if (!head) + head = txqi; + if (txqi->txq.sta) { struct sta_info *sta = container_of(txqi->txq.sta, - struct sta_info, sta); + struct sta_info, sta); + bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); + s64 deficit = sta->airtime[txqi->txq.ac].deficit; + + if (aql_check) + found_eligible_txq = true; - if (sta->airtime[txqi->txq.ac].deficit < 0) { + if (deficit < 0) sta->airtime[txqi->txq.ac].deficit += sta->airtime_weight; + + if (deficit < 0 || !aql_check) { list_move_tail(&txqi->schedule_order, &local->active_txqs[txqi->txq.ac]); goto begin; @@ -3740,6 +3754,32 @@ void __ieee80211_schedule_txq(struct ieee80211_hw *hw, } EXPORT_SYMBOL(__ieee80211_schedule_txq); +bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, + struct ieee80211_txq *txq) +{ + struct sta_info *sta; + struct ieee80211_local *local = hw_to_local(hw); + + if (!(local->airtime_flags & AIRTIME_USE_AQL)) + return true; + + if (!txq->sta) + return true; + + sta = container_of(txq->sta, struct sta_info, sta); + if (sta->airtime[txq->ac].aql_tx_pending < + sta->airtime[txq->ac].aql_limit_low) + return true; + + if (local->aql_total_pending_airtime < local->aql_threshold && + sta->airtime[txq->ac].aql_tx_pending < + sta->airtime[txq->ac].aql_limit_high) + return true; + + return false; +} +EXPORT_SYMBOL(ieee80211_txq_airtime_check); + bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, struct ieee80211_txq *txq) { From patchwork Fri Oct 11 02:24:13 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kan Yan X-Patchwork-Id: 11184783 X-Patchwork-Delegate: kvalo@adurom.com Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C84A91864 for ; Fri, 11 Oct 2019 02:24:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9EA6D21A4A for ; Fri, 11 Oct 2019 02:24:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="q9mkOC6K" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728077AbfJKCYY (ORCPT ); Thu, 10 Oct 2019 22:24:24 -0400 Received: from mail-pf1-f201.google.com ([209.85.210.201]:57055 "EHLO mail-pf1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728066AbfJKCYY (ORCPT ); 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Thu, 10 Oct 2019 19:24:23 -0700 (PDT) Date: Thu, 10 Oct 2019 19:24:13 -0700 In-Reply-To: <20191011022413.176208-1-kyan@google.com> Message-Id: <20191011022413.176208-3-kyan@google.com> Mime-Version: 1.0 References: <20191011022413.176208-1-kyan@google.com> X-Mailer: git-send-email 2.23.0.700.g56cf767bdb-goog Subject: [PATCH v4 2/2] ath10k: Enable Airtime-based Queue Limit (AQL) From: Kan Yan To: johannes@sipsolutions.net Cc: linux-wireless@vger.kernel.org, make-wifi-fast@lists.bufferbloat.net, toke@redhat.com, nbd@nbd.name, ath10k@lists.infradead.org, yiboz@codeaurora.org, Kan Yan Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Calculate the estimated airtime pending in the txqs and apply AQL to prevent excessive amounts of packets being queued in the firmware queue. Signed-off-by: Kan Yan --- drivers/net/wireless/ath/ath10k/htt_rx.c | 1 + drivers/net/wireless/ath/ath10k/mac.c | 6 ++++-- drivers/net/wireless/ath/ath10k/txrx.c | 11 ++++++++--- 3 files changed, 13 insertions(+), 5 deletions(-) diff --git a/drivers/net/wireless/ath/ath10k/htt_rx.c b/drivers/net/wireless/ath/ath10k/htt_rx.c index 83a7fb68fd24..12d63fa02e8e 100644 --- a/drivers/net/wireless/ath/ath10k/htt_rx.c +++ b/drivers/net/wireless/ath/ath10k/htt_rx.c @@ -3053,6 +3053,7 @@ static void ath10k_htt_rx_tx_fetch_ind(struct ath10k *ar, struct sk_buff *skb) num_msdus++; num_bytes += ret; + may_tx = ieee80211_txq_airtime_check(hw, txq); } ieee80211_return_txq(hw, txq, false); ieee80211_txq_schedule_end(hw, txq->ac); diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c index 0606416dc971..ed19a40c2c3a 100644 --- a/drivers/net/wireless/ath/ath10k/mac.c +++ b/drivers/net/wireless/ath/ath10k/mac.c @@ -3983,6 +3983,9 @@ static bool ath10k_mac_tx_can_push(struct ieee80211_hw *hw, struct ath10k_txq *artxq = (void *)txq->drv_priv; /* No need to get locks */ + if (!ieee80211_txq_airtime_check(hw, txq)) + return false; + if (ar->htt.tx_q_state.mode == HTT_TX_MODE_SWITCH_PUSH) return true; @@ -4014,8 +4017,6 @@ static u16 ath10k_mac_update_airtime(struct ath10k *ar, if (!txq || !txq->sta) return airtime; - if (test_bit(WMI_SERVICE_REPORT_AIRTIME, ar->wmi.svc_map)) - return airtime; spin_lock_bh(&ar->data_lock); arsta = (struct ath10k_sta *)txq->sta->drv_priv; @@ -4038,6 +4039,7 @@ static u16 ath10k_mac_update_airtime(struct ath10k *ar, } spin_unlock_bh(&ar->data_lock); + ieee80211_sta_register_pending_airtime(txq->sta, txq->tid, airtime); return airtime; } diff --git a/drivers/net/wireless/ath/ath10k/txrx.c b/drivers/net/wireless/ath/ath10k/txrx.c index 4102df016931..739046b34d4b 100644 --- a/drivers/net/wireless/ath/ath10k/txrx.c +++ b/drivers/net/wireless/ath/ath10k/txrx.c @@ -84,9 +84,14 @@ int ath10k_txrx_tx_unref(struct ath10k_htt *htt, wake_up(&htt->empty_tx_wq); spin_unlock_bh(&htt->tx_lock); - if (txq && txq->sta && skb_cb->airtime_est) - ieee80211_sta_register_airtime(txq->sta, txq->tid, - skb_cb->airtime_est, 0); + if (txq && txq->sta && skb_cb->airtime_est) { + if (!test_bit(WMI_SERVICE_REPORT_AIRTIME, ar->wmi.svc_map)) + ieee80211_sta_register_airtime(txq->sta, txq->tid, + skb_cb->airtime_est, 0); + + ieee80211_sta_release_pending_airtime(txq->sta, txq->tid, + skb_cb->airtime_est); + } if (ar->bus_param.dev_type != ATH10K_DEV_TYPE_HL) dma_unmap_single(dev, skb_cb->paddr, msdu->len, DMA_TO_DEVICE);