From: Johannes Berg Date: Tue, 19 Dec 2017 09:10:48 +0000 (+0100) Subject: Revert "mac80211: Add airtime account and scheduling to TXQs" X-Git-Tag: for-linus-20180210~31^2~238^2~4 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=0973dd45ecefd746569d414406f5733062fe2817;p=linux-2.6-block.git Revert "mac80211: Add airtime account and scheduling to TXQs" This reverts commit b0d52ad821843a6c5badebd80feef9f871904fa6. We need to revert the TXQ scheduling API due to conflicts with a new driver, and this depends on that API. Signed-off-by: Johannes Berg --- diff --git a/include/net/mac80211.h b/include/net/mac80211.h index 531b526a10db..45155803c875 100644 --- a/include/net/mac80211.h +++ b/include/net/mac80211.h @@ -1188,8 +1188,6 @@ enum mac80211_rx_encoding { * HT or VHT is used (%RX_FLAG_HT/%RX_FLAG_VHT) * @nss: number of streams (VHT and HE only) * @flag: %RX_FLAG_\* - * @airtime: Duration of frame in usec. See @IEEE80211_HW_AIRTIME_ACCOUNTING for - * how to use this. * @encoding: &enum mac80211_rx_encoding * @bw: &enum rate_info_bw * @enc_flags: uses bits from &enum mac80211_rx_encoding_flags @@ -1204,7 +1202,6 @@ struct ieee80211_rx_status { u32 device_timestamp; u32 ampdu_reference; u32 flag; - u16 airtime; u16 freq; u8 enc_flags; u8 encoding:2, bw:3; @@ -2069,26 +2066,6 @@ struct ieee80211_txq { * @IEEE80211_HW_SUPPORTS_TDLS_BUFFER_STA: Hardware supports buffer STA on * TDLS links. * - * @IEEE80211_HW_AIRTIME_ACCOUNTING: Hardware supports accounting the airtime - * usage of other stations and reports it in the @tx_time and/or @airtime - * fields of the TX/RX status structs. - * When setting this flag, the driver should ensure that the respective - * fields in the TX and RX status structs are always either zero or - * contains a valid duration for the frame in usec. The driver can choose - * to report either or both of TX and RX airtime, but it is recommended to - * report both. - * 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. - * For aggregated frames, there are two possible strategies to report the - * airtime: Either include the airtime of the entire aggregate in the first - * (or last) frame and leave the others at zero. Alternatively, include the - * overhead of the full aggregate in the first or last frame and report the - * time of each frame + padding not including the full aggregate overhead. - * * @NUM_IEEE80211_HW_FLAGS: number of hardware flags, used for sizing arrays */ enum ieee80211_hw_flags { @@ -2132,7 +2109,6 @@ enum ieee80211_hw_flags { IEEE80211_HW_REPORTS_LOW_ACK, IEEE80211_HW_SUPPORTS_TX_FRAG, IEEE80211_HW_SUPPORTS_TDLS_BUFFER_STA, - IEEE80211_HW_AIRTIME_ACCOUNTING, /* keep last, obviously */ NUM_IEEE80211_HW_FLAGS diff --git a/net/mac80211/debugfs.c b/net/mac80211/debugfs.c index d6b87a4ec3e9..1f466d12a6bc 100644 --- a/net/mac80211/debugfs.c +++ b/net/mac80211/debugfs.c @@ -212,7 +212,6 @@ static const char *hw_flag_names[] = { FLAG(REPORTS_LOW_ACK), FLAG(SUPPORTS_TX_FRAG), FLAG(SUPPORTS_TDLS_BUFFER_STA), - FLAG(AIRTIME_ACCOUNTING), #undef FLAG }; diff --git a/net/mac80211/debugfs_sta.c b/net/mac80211/debugfs_sta.c index 40dba446836f..b15412c21ac9 100644 --- a/net/mac80211/debugfs_sta.c +++ b/net/mac80211/debugfs_sta.c @@ -188,32 +188,6 @@ 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; - size_t bufsz = 200; - char *buf = kzalloc(bufsz, GFP_KERNEL), *p = buf; - ssize_t rv; - - if (!buf) - return -ENOMEM; - - spin_lock_bh(&sta->lock); - - p += scnprintf(p, bufsz + buf - p, - "RX: %llu us\nTX: %llu us\nDeficit: %lld us\n", - sta->airtime_stats.rx_airtime, - sta->airtime_stats.tx_airtime, - sta->airtime_deficit); - - spin_unlock_bh(&sta->lock); - 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) { @@ -568,9 +542,6 @@ void ieee80211_sta_debugfs_add(struct sta_info *sta) if (local->ops->wake_tx_queue) DEBUGFS_ADD(aqm); - if (ieee80211_hw_check(&local->hw, AIRTIME_ACCOUNTING)) - 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 120c516851cf..4155838c7bef 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -90,9 +90,6 @@ extern const u8 ieee80211_ac_to_qos_mask[IEEE80211_NUM_ACS]; #define IEEE80211_MAX_NAN_INSTANCE_ID 255 -/* How much to increase airtime deficit on each scheduling round */ -#define IEEE80211_AIRTIME_QUANTUM 1000 /* usec */ - struct ieee80211_fragment_entry { struct sk_buff_head skb_list; unsigned long first_frag_time; @@ -1126,10 +1123,9 @@ struct ieee80211_local { struct codel_vars *cvars; struct codel_params cparams; - /* protects active_txqs_{new,old} and txqi->schedule_order */ + /* protects active_txqs and txqi->schedule_order */ spinlock_t active_txq_lock; - struct list_head active_txqs_new; - struct list_head active_txqs_old; + struct list_head active_txqs; const struct ieee80211_ops *ops; diff --git a/net/mac80211/main.c b/net/mac80211/main.c index b7142f8491d0..935d6e2491b1 100644 --- a/net/mac80211/main.c +++ b/net/mac80211/main.c @@ -619,8 +619,7 @@ struct ieee80211_hw *ieee80211_alloc_hw_nm(size_t priv_data_len, spin_lock_init(&local->rx_path_lock); spin_lock_init(&local->queue_stop_reason_lock); - INIT_LIST_HEAD(&local->active_txqs_new); - INIT_LIST_HEAD(&local->active_txqs_old); + INIT_LIST_HEAD(&local->active_txqs); spin_lock_init(&local->active_txq_lock); INIT_LIST_HEAD(&local->chanctx_list); diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index 808f41fb536a..b3cff69bfd66 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -1630,14 +1630,6 @@ ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) if (ieee80211_vif_is_mesh(&rx->sdata->vif)) ieee80211_mps_rx_h_sta_process(sta, hdr); - /* airtime accounting */ - if (status->airtime) { - spin_lock_bh(&sta->lock); - sta->airtime_stats.rx_airtime += status->airtime; - sta->airtime_deficit -= status->airtime; - spin_unlock_bh(&sta->lock); - } - /* * Drop (qos-)data::nullfunc frames silently, since they * are used only to control station power saving mode. diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c index ed5500e8aafb..e0bcf16df494 100644 --- a/net/mac80211/sta_info.c +++ b/net/mac80211/sta_info.c @@ -425,8 +425,6 @@ struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata, sta->cparams.interval = MS2TIME(100); sta->cparams.ecn = true; - sta->airtime_deficit = IEEE80211_AIRTIME_QUANTUM; - sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr); return sta; diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h index e356f2f85e12..cd53619435b6 100644 --- a/net/mac80211/sta_info.h +++ b/net/mac80211/sta_info.h @@ -559,13 +559,6 @@ struct sta_info { } tx_stats; u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1]; - /* Airtime stats and deficit, protected by lock */ - struct { - u64 rx_airtime; - u64 tx_airtime; - } airtime_stats; - s64 airtime_deficit; - /* * Aggregation information, locked with lock. */ diff --git a/net/mac80211/status.c b/net/mac80211/status.c index b044dbed2bb1..da7427a41529 100644 --- a/net/mac80211/status.c +++ b/net/mac80211/status.c @@ -823,14 +823,6 @@ static void __ieee80211_tx_status(struct ieee80211_hw *hw, ieee80211_lost_packet(sta, info); } } - - if (info->status.tx_time && - ieee80211_hw_check(&local->hw, AIRTIME_ACCOUNTING)) { - spin_lock_bh(&sta->lock); - sta->airtime_stats.tx_airtime += info->status.tx_time; - sta->airtime_deficit -= info->status.tx_time; - spin_unlock_bh(&sta->lock); - } } /* SNMP counters @@ -955,14 +947,6 @@ void ieee80211_tx_status_ext(struct ieee80211_hw *hw, sta->status_stats.retry_failed++; sta->status_stats.retry_count += retry_count; - if (info->status.tx_time && - ieee80211_hw_check(&local->hw, AIRTIME_ACCOUNTING)) { - spin_lock_bh(&sta->lock); - sta->airtime_stats.tx_airtime += info->status.tx_time; - sta->airtime_deficit -= info->status.tx_time; - spin_unlock_bh(&sta->lock); - } - if (acked) { sta->status_stats.last_ack = jiffies; diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 18381581b5e9..842881ca8f20 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -3566,7 +3566,7 @@ bool ieee80211_schedule_txq(struct ieee80211_hw *hw, spin_lock_bh(&local->active_txq_lock); if (list_empty(&txqi->schedule_order)) { - list_add_tail(&txqi->schedule_order, &local->active_txqs_new); + list_add_tail(&txqi->schedule_order, &local->active_txqs); ret = true; } @@ -3580,35 +3580,14 @@ struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw) { struct ieee80211_local *local = hw_to_local(hw); struct txq_info *txqi = NULL; - struct list_head *head; spin_lock_bh(&local->active_txq_lock); -begin: - head = &local->active_txqs_new; - if (list_empty(head)) { - head = &local->active_txqs_old; - if (list_empty(head)) - goto out; - } - - txqi = list_first_entry(head, struct txq_info, schedule_order); - - if (txqi->txq.sta) { - struct sta_info *sta = container_of(txqi->txq.sta, - struct sta_info, sta); - - spin_lock_bh(&sta->lock); - if (sta->airtime_deficit < 0) { - sta->airtime_deficit += IEEE80211_AIRTIME_QUANTUM; - list_move_tail(&txqi->schedule_order, - &local->active_txqs_old); - spin_unlock_bh(&sta->lock); - goto begin; - } - spin_unlock_bh(&sta->lock); - } + if (list_empty(&local->active_txqs)) + goto out; + txqi = list_first_entry(&local->active_txqs, + struct txq_info, schedule_order); list_del_init(&txqi->schedule_order); out: