[3/6] mac80211: Add airtime accounting and scheduling to TXQs

Message ID	1540033534-11211-4-git-send-email-rmanohar@codeaurora.org (mailing list archive)
State	Changes Requested
Delegated to:	Johannes Berg
Headers	show Return-Path: <linux-wireless-owner@kernel.org> sender: rmanohar@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 5C7466087F; Sat, 20 Oct 2018 11:05:46 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 5C7466087F From: Rajkumar Manoharan <rmanohar@codeaurora.org> To: linux-wireless@vger.kernel.org, ath10k@lists.infradead.org Cc: =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= <toke@toke.dk>, Rajkumar Manoharan <rmanohar@codeaurora.org> Subject: [PATCH 3/6] mac80211: Add airtime accounting and scheduling to TXQs Date: Sat, 20 Oct 2018 04:05:31 -0700 Message-Id: <1540033534-11211-4-git-send-email-rmanohar@codeaurora.org> In-Reply-To: <1540033534-11211-1-git-send-email-rmanohar@codeaurora.org> References: <1540033534-11211-1-git-send-email-rmanohar@codeaurora.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk
Series	Move TXQ scheduling and airtime fairness into mac80211 \| expand [0/6] Move TXQ scheduling and airtime fairness into mac80211 [1/6] mac80211: Add TXQ scheduling API [2/6] cfg80211: Add airtime statistics and settings [3/6] mac80211: Add airtime accounting and scheduling to TXQs [4/6] ath9k: Switch to mac80211 TXQ scheduling and airtime APIs [5/6] ath10k: migrate to mac80211 txq scheduling [6/6] ath10k: reporting estimated tx airtime for fairness

diff --git a/include/net/mac80211.h b/include/net/mac80211.h index 2f5c0fbd453c..0ced3adb09ac 100644 --- a/include/net/mac80211.h +++ b/include/net/mac80211.h @@ -2334,6 +2334,8 @@ enum ieee80211_hw_flags { * @tx_sk_pacing_shift: Pacing shift to set on TCP sockets when frames from * them are encountered. The default should typically not be changed, * unless the driver has good reasons for needing more buffers. + * + * @airtime_weight: Default airtime weight preferred by driver. */ struct ieee80211_hw { struct ieee80211_conf conf; @@ -2370,6 +2372,7 @@ struct ieee80211_hw { const struct ieee80211_cipher_scheme *cipher_schemes; u8 max_nan_de_entries; u8 tx_sk_pacing_shift; + u32 airtime_weight; }; static inline bool _ieee80211_hw_check(struct ieee80211_hw *hw, @@ -5350,6 +5353,34 @@ void ieee80211_sta_block_awake(struct ieee80211_hw *hw, void ieee80211_send_eosp_nullfunc(struct ieee80211_sta *pubsta, int tid); /** + * ieee80211_sta_register_airtime - register airtime usage for a sta/tid + * + * Register airtime usage for a given sta on a given tid. The driver can call + * this function to notify mac80211 that a station used a certain amount of + * airtime. This information will be used by the TXQ scheduler to schedule + * stations in a way that ensures airtime fairness. + * + * The reported airtime should as a minimum include all time that is spent + * transmitting to the remote station, including overhead and padding, but not + * including time spent waiting for a TXOP. If the time is not reported by the + * hardware it can in some cases be calculated from the rate and known frame + * composition. When possible, the time should include any failed transmission + * attempts. + * + * The driver can either call this function synchronously for every packet or + * aggregate, or asynchronously as airtime usage information becomes available. + * TX and RX airtime can be reported together, or separately by setting one of + * them to 0. + * + * @pubsta: the station + * @tid: the TID to register airtime for + * @tx_airtime: airtime used during TX (in usec) + * @rx_airtime: airtime used during RX (in usec) + */ +void ieee80211_sta_register_airtime(struct ieee80211_sta *pubsta, u8 tid, + u32 tx_airtime, u32 rx_airtime); + +/** * ieee80211_iter_keys - iterate keys programmed into the device * @hw: pointer obtained from ieee80211_alloc_hw() * @vif: virtual interface to iterate, may be %NULL for all @@ -6107,6 +6138,33 @@ struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, void ieee80211_txq_schedule_end(struct ieee80211_hw *hw, u8 ac); /** + * ieee80211_txq_may_transmit - check whether TXQ is allowed to transmit + * + * This function is used to check whether given txq is allowed to transmit by + * the airtime scheduler, and can be used by drivers to access the airtime + * fairness accounting without going using the scheduling order enfored by + * next_txq(). + * + * Returns %true if the airtime scheduler thinks the TXQ should be allowed to + * transmit, and %false if it should be throttled. This function can also have + * the side effect of rotating the TXQ in the scheduler rotation, which will + * eventually bring the deficit to positive and allow the station to transmit + * again. + * + * The API ieee80211_txq_may_transmit() also ensures that TXQ list will be + * aligned aginst driver's own round-robin scheduler list. i.e it rotates + * the TXQ list till it makes the requested node becomes the first entry + * in TXQ list. Thus both the TXQ list and driver's list are in sync. If this + * function returns %true, the driver is expected to schedule packets + * for transmission, and then return the TXQ through ieee80211_return_txq(). + * + * @hw: pointer as obtained from ieee80211_alloc_hw() + * @txq: pointer obtained from station or virtual interface + */ +bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, + struct ieee80211_txq *txq); + +/** * ieee80211_txq_get_depth - get pending frame/byte count of given txq * * The values are not guaranteed to be coherent with regard to each other, i.e. diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c index 914aef7e7afd..337ac2b57e59 100644 --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -1388,6 +1388,9 @@ static int sta_apply_parameters(struct ieee80211_local *local, if (ieee80211_vif_is_mesh(&sdata->vif)) sta_apply_mesh_params(local, sta, params); + if (params->airtime_weight) + sta->airtime_weight = params->airtime_weight; + /* set the STA state after all sta info from usermode has been set */ if (test_sta_flag(sta, WLAN_STA_TDLS_PEER) || set & BIT(NL80211_STA_FLAG_ASSOCIATED)) { diff --git a/net/mac80211/debugfs.c b/net/mac80211/debugfs.c index 3fe541e358f3..81c5fec2eae7 100644 --- a/net/mac80211/debugfs.c +++ b/net/mac80211/debugfs.c @@ -383,6 +383,9 @@ void debugfs_hw_add(struct ieee80211_local *local) if (local->ops->wake_tx_queue) DEBUGFS_ADD_MODE(aqm, 0600); + debugfs_create_u16("airtime_flags", 0600, + phyd, &local->airtime_flags); + 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 af5185a836e5..446908ab3f5d 100644 --- a/net/mac80211/debugfs_sta.c +++ b/net/mac80211/debugfs_sta.c @@ -181,9 +181,9 @@ static ssize_t sta_aqm_read(struct file *file, char __user *userbuf, txqi->tin.tx_bytes, txqi->tin.tx_packets, txqi->flags, - txqi->flags & (1<<IEEE80211_TXQ_STOP) ? "STOP" : "RUN", - txqi->flags & (1<<IEEE80211_TXQ_AMPDU) ? " AMPDU" : "", - txqi->flags & (1<<IEEE80211_TXQ_NO_AMSDU) ? " NO-AMSDU" : ""); + test_bit(IEEE80211_TXQ_STOP, &txqi->flags) ? "STOP" : "RUN", + test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags) ? " AMPDU" : "", + test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags) ? " NO-AMSDU" : ""); } rcu_read_unlock(); @@ -195,6 +195,46 @@ static ssize_t sta_aqm_read(struct file *file, char __user *userbuf, } STA_OPS(aqm); +static ssize_t sta_airtime_read(struct file *file, char __user *userbuf, + size_t count, loff_t *ppos) +{ + struct sta_info *sta = file->private_data; + struct ieee80211_local *local = sta->sdata->local; + size_t bufsz = 200; + char *buf = kzalloc(bufsz, GFP_KERNEL), *p = buf; + u64 rx_airtime = 0, tx_airtime = 0; + s64 deficit[IEEE80211_NUM_ACS]; + ssize_t rv; + int ac; + + if (!buf) + return -ENOMEM; + + for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { + spin_lock_bh(&local->active_txq_lock[ac]); + rx_airtime += sta->airtime[ac].rx_airtime; + tx_airtime += sta->airtime[ac].tx_airtime; + deficit[ac] = sta->airtime[ac].deficit; + 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]); + + rv = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf); + kfree(buf); + return rv; +} +STA_OPS(airtime); + static ssize_t sta_agg_status_read(struct file *file, char __user *userbuf, size_t count, loff_t *ppos) { @@ -906,6 +946,10 @@ void ieee80211_sta_debugfs_add(struct sta_info *sta) if (local->ops->wake_tx_queue) DEBUGFS_ADD(aqm); + if (wiphy_ext_feature_isset(local->hw.wiphy, + NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) + DEBUGFS_ADD(airtime); + if (sizeof(sta->driver_buffered_tids) == sizeof(u32)) debugfs_create_x32("driver_buffered_tids", 0400, sta->debugfs_dir, diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index 976531717902..7abc20c0e47c 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -1136,6 +1136,8 @@ struct ieee80211_local { struct list_head active_txqs[IEEE80211_NUM_ACS]; u16 schedule_round[IEEE80211_NUM_ACS]; + u16 airtime_flags; + const struct ieee80211_ops *ops; /* diff --git a/net/mac80211/main.c b/net/mac80211/main.c index 3ea2369e0992..3d79f42042dd 100644 --- a/net/mac80211/main.c +++ b/net/mac80211/main.c @@ -667,6 +667,7 @@ struct ieee80211_hw *ieee80211_alloc_hw_nm(size_t priv_data_len, INIT_LIST_HEAD(&local->active_txqs[i]); spin_lock_init(&local->active_txq_lock[i]); } + local->airtime_flags = AIRTIME_USE_TX | AIRTIME_USE_RX; INIT_LIST_HEAD(&local->chanctx_list); mutex_init(&local->chanctx_mtx); @@ -1153,6 +1154,9 @@ int ieee80211_register_hw(struct ieee80211_hw *hw) if (!local->hw.max_nan_de_entries) local->hw.max_nan_de_entries = IEEE80211_MAX_NAN_INSTANCE_ID; + if (!local->hw.airtime_weight) + local->hw.airtime_weight = IEEE80211_DEFAULT_AIRTIME_WEIGHT; + result = ieee80211_wep_init(local); if (result < 0) wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n", diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c index c2f5cb7df54f..5a6d05063341 100644 --- a/net/mac80211/sta_info.c +++ b/net/mac80211/sta_info.c @@ -90,7 +90,6 @@ static void __cleanup_single_sta(struct sta_info *sta) struct tid_ampdu_tx *tid_tx; struct ieee80211_sub_if_data *sdata = sta->sdata; struct ieee80211_local *local = sdata->local; - struct fq *fq = &local->fq; struct ps_data *ps; if (test_sta_flag(sta, WLAN_STA_PS_STA) || @@ -120,9 +119,7 @@ static void __cleanup_single_sta(struct sta_info *sta) txqi = to_txq_info(sta->sta.txq[i]); - spin_lock_bh(&fq->lock); ieee80211_txq_purge(local, txqi); - spin_unlock_bh(&fq->lock); } } @@ -387,9 +384,12 @@ struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata, if (sta_prepare_rate_control(local, sta, gfp)) goto free_txq; + sta->airtime_weight = hw->airtime_weight; + for (i = 0; i < IEEE80211_NUM_ACS; i++) { skb_queue_head_init(&sta->ps_tx_buf[i]); skb_queue_head_init(&sta->tx_filtered[i]); + sta->airtime[i].deficit = sta->airtime_weight; } for (i = 0; i < IEEE80211_NUM_TIDS; i++) @@ -1826,6 +1826,28 @@ void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta, } EXPORT_SYMBOL(ieee80211_sta_set_buffered); +void ieee80211_sta_register_airtime(struct ieee80211_sta *pubsta, u8 tid, + u32 tx_airtime, u32 rx_airtime) +{ + struct sta_info *sta = container_of(pubsta, struct sta_info, sta); + struct ieee80211_local *local = sta->sdata->local; + struct txq_info *txqi; + u8 ac = ieee80211_ac_from_tid(tid); + u32 airtime = 0; + + if (sta->local->airtime_flags & AIRTIME_USE_TX) + airtime += tx_airtime; + if (sta->local->airtime_flags & AIRTIME_USE_RX) + airtime += rx_airtime; + + spin_lock_bh(&local->active_txq_lock[ac]); + sta->airtime[ac].tx_airtime += tx_airtime; + sta->airtime[ac].rx_airtime += rx_airtime; + sta->airtime[ac].deficit -= airtime; + spin_unlock_bh(&local->active_txq_lock[ac]); +} +EXPORT_SYMBOL(ieee80211_sta_register_airtime); + int sta_info_move_state(struct sta_info *sta, enum ieee80211_sta_state new_state) { @@ -2188,6 +2210,23 @@ void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo, sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_FAILED); } + if (!(sinfo->filled & BIT(NL80211_STA_INFO_RX_DURATION))) { + for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) + sinfo->rx_duration += sta->airtime[ac].rx_airtime; + sinfo->filled |= BIT(NL80211_STA_INFO_RX_DURATION); + } + + if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_DURATION))) { + for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) + sinfo->tx_duration += sta->airtime[ac].tx_airtime; + sinfo->filled |= BIT(NL80211_STA_INFO_TX_DURATION); + } + + if (!(sinfo->filled & BIT(NL80211_STA_INFO_AIRTIME_WEIGHT))) { + sinfo->airtime_weight = sta->airtime_weight; + sinfo->filled |= BIT(NL80211_STA_INFO_AIRTIME_WEIGHT); + } + sinfo->rx_dropped_misc = sta->rx_stats.dropped; if (sta->pcpu_rx_stats) { for_each_possible_cpu(cpu) { diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h index 9a04327d71d1..b1b0fd6a2e21 100644 --- a/net/mac80211/sta_info.h +++ b/net/mac80211/sta_info.h @@ -127,6 +127,16 @@ enum ieee80211_agg_stop_reason { AGG_STOP_DESTROY_STA, }; +/* Debugfs flags to enable/disable use of RX/TX airtime in scheduler */ +#define AIRTIME_USE_TX BIT(0) +#define AIRTIME_USE_RX BIT(1) + +struct airtime_info { + u64 rx_airtime; + u64 tx_airtime; + s64 deficit; +}; + struct sta_info; /** @@ -563,6 +573,9 @@ struct sta_info { } tx_stats; u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1]; + struct airtime_info airtime[IEEE80211_NUM_ACS]; + u16 airtime_weight; + /* * Aggregation information, locked with lock. */ diff --git a/net/mac80211/status.c b/net/mac80211/status.c index 91d7c0cd1882..cd4582f80fea 100644 --- a/net/mac80211/status.c +++ b/net/mac80211/status.c @@ -818,6 +818,12 @@ static void __ieee80211_tx_status(struct ieee80211_hw *hw, ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data, acked, info->status.tx_time); + if (info->status.tx_time && + wiphy_ext_feature_isset(local->hw.wiphy, + NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) + ieee80211_sta_register_airtime(&sta->sta, tid, + info->status.tx_time, 0); + if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) { if (info->flags & IEEE80211_TX_STAT_ACK) { if (sta->status_stats.lost_packets) diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 305965283506..dd2354188357 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -1488,8 +1488,11 @@ void ieee80211_txq_purge(struct ieee80211_local *local, struct fq *fq = &local->fq; struct fq_tin *tin = &txqi->tin; + spin_lock_bh(&fq->lock); fq_tin_reset(fq, tin, fq_skb_free_func); ieee80211_purge_tx_queue(&local->hw, &txqi->frags); + spin_unlock_bh(&fq->lock); + spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); list_del_init(&txqi->schedule_order); spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); @@ -3638,11 +3641,28 @@ struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) lockdep_assert_held(&local->active_txq_lock[ac]); + begin: txqi = list_first_entry_or_null(&local->active_txqs[ac], struct txq_info, schedule_order); + if (!txqi) + return NULL; + + if (txqi->txq.sta) { + struct sta_info *sta = container_of(txqi->txq.sta, + struct sta_info, sta); + + if (sta->airtime[txqi->txq.ac].deficit < 0) { + sta->airtime[txqi->txq.ac].deficit += + sta->airtime_weight; + list_move_tail(&txqi->schedule_order, + &local->active_txqs[txqi->txq.ac]); + goto begin; + } + } + - if (!txqi || txqi->schedule_round == local->schedule_round[ac]) + if (txqi->schedule_round == local->schedule_round[ac]) return NULL; list_del_init(&txqi->schedule_order); @@ -3660,12 +3680,74 @@ void ieee80211_return_txq(struct ieee80211_hw *hw, lockdep_assert_held(&local->active_txq_lock[txq->ac]); if (list_empty(&txqi->schedule_order) && - (!skb_queue_empty(&txqi->frags) || txqi->tin.backlog_packets)) - list_add_tail(&txqi->schedule_order, - &local->active_txqs[txq->ac]); + (!skb_queue_empty(&txqi->frags) || txqi->tin.backlog_packets)) { + /* If airtime accounting is active, always enqueue STAs at the + * head of the list to ensure that they only get moved to the + * back by the airtime DRR scheduler once they have a negative + * deficit. A station that already has a negative deficit will + * get immediately moved to the back of the list on the next + * call to ieee80211_next_txq(). + */ + if (wiphy_ext_feature_isset(local->hw.wiphy, + NL80211_EXT_FEATURE_AIRTIME_FAIRNESS) + && txqi->txq.sta) + list_add(&txqi->schedule_order, + &local->active_txqs[txq->ac]); + else + list_add_tail(&txqi->schedule_order, + &local->active_txqs[txq->ac]); + } } EXPORT_SYMBOL(ieee80211_return_txq); +bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, + struct ieee80211_txq *txq) +{ + struct ieee80211_local *local = hw_to_local(hw); + struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); + struct sta_info *sta; + u8 ac = txq->ac; + + lockdep_assert_held(&local->active_txq_lock[ac]); + + if (!txqi->txq.sta) + goto out; + + if (list_empty(&txqi->schedule_order)) + goto out; + + list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], + schedule_order) { + if (iter == txqi) + break; + + if (!iter->txq.sta) { + list_move_tail(&iter->schedule_order, + &local->active_txqs[ac]); + continue; + } + sta = container_of(iter->txq.sta, struct sta_info, sta); + if (sta->airtime[ac].deficit < 0) + sta->airtime[ac].deficit += sta->airtime_weight; + list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); + } + + sta = container_of(txqi->txq.sta, struct sta_info, sta); + if (sta->airtime[ac].deficit >= 0) + goto out; + + sta->airtime[ac].deficit += sta->airtime_weight; + list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); + + return false; +out: + if (!list_empty(&txqi->schedule_order)) + list_del_init(&txqi->schedule_order); + + return true; +} +EXPORT_SYMBOL(ieee80211_txq_may_transmit); + void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) { struct ieee80211_local *local = hw_to_local(hw);

[3/6] mac80211: Add airtime accounting and scheduling to TXQs

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