From patchwork Sat Nov 16 11:57:18 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= X-Patchwork-Id: 11247545 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 7926C6C1 for ; Sat, 16 Nov 2019 11:57:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 592AB206E6 for ; Sat, 16 Nov 2019 11:57:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Rk/Ofw01" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727474AbfKPL5Y (ORCPT ); Sat, 16 Nov 2019 06:57:24 -0500 Received: from us-smtp-1.mimecast.com ([207.211.31.81]:42413 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726794AbfKPL5Y (ORCPT ); Sat, 16 Nov 2019 06:57:24 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1573905443; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=YXoS2W5BbZsp09HQfFBXWaQ8N7PlWsSs7THfUeKuQyo=; b=Rk/Ofw01ilidAHxDEbF3CVU5u1j47aBhV9BPoWiB/TuUDJpToPSeH+r8JL4r5OS/orRu4r 3+y1nDwm0C1rbTB7O9TMeIzKHOrkJmc112sXUkMdpXbJLkhmWhsm8A8MDCQCvyjYcfjq40 uNBvcn/j599rKWosYV2HdsmOZ5l3PZk= Received: from mail-lf1-f69.google.com (mail-lf1-f69.google.com [209.85.167.69]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-5-RKWHDo-eN4WZzo496X8XSg-1; Sat, 16 Nov 2019 06:57:22 -0500 Received: by mail-lf1-f69.google.com with SMTP id k30so3979149lfj.5 for ; Sat, 16 Nov 2019 03:57:22 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:from:to:cc:date:message-id:in-reply-to :references:user-agent:mime-version:content-transfer-encoding; bh=x+t/BOQM8F7dbfpj4lBhXe72lJwS1NOF599JEwP8bYk=; b=RIrbk8qt/rUfbPI0Kt9mPe0FftkWljsrwfGoBWi4UxxaQ+tMnhhsxiPXdgjyWEd9iZ rlZrYJCc+HF5tJtm+T92BXPg4N5QlOAVHfRgLYy6vnwnXJRYuJnpH+3puaxbXvCsl8bS yagrbfZggOVkv73kcU5JUxru2PmKs+9l3RZAHesL0ECr6CeyQAicvRUlo4MXIwxTb/sk OR5Qs41HNE7pBtsuMMWhHrNEA6qdAOu+iPZIIJYDWg+S8UImCD7x9rH+/6Unzoyfaxtz yL9+RF+goj24CyD9V3ris+SfuA3KH/ve1BWDb9TUhtd+Q6QoHi9JRQJaGJYMliLH3UN1 39hQ== X-Gm-Message-State: APjAAAXs9P1oBoFSxNMqvi+bXg/xhSTfY79lN0/dZo8FNSv5r8uhTTX5 +p/Qs8JrHbFh/TAylrSUlsigPO2pgrTYEuQoCppVDo/DBorSyBsgD1GQ3iGVhs63rWRQ4GhRhqk LoaEmUUB2lWauaia/jlcx6Z8Iuzg= X-Received: by 2002:a2e:9156:: with SMTP id q22mr10462785ljg.166.1573905440929; Sat, 16 Nov 2019 03:57:20 -0800 (PST) X-Google-Smtp-Source: APXvYqz0L+POcRH+ZCGceuYnd9tkUS+fm0ri2a2QHKWHz6GQdx5Ehz43kLACA3daj8P4f0JD6MpnUA== X-Received: by 2002:a2e:9156:: with SMTP id q22mr10462771ljg.166.1573905440761; Sat, 16 Nov 2019 03:57:20 -0800 (PST) Received: from alrua-x1.borgediget.toke.dk ([2a00:7660:6da:443::2]) by smtp.gmail.com with ESMTPSA id s28sm6071884lfp.92.2019.11.16.03.57.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 16 Nov 2019 03:57:18 -0800 (PST) Received: by alrua-x1.borgediget.toke.dk (Postfix, from userid 1000) id 1483C181911; Sat, 16 Nov 2019 12:57:18 +0100 (CET) Subject: [PATCH v10 1/4] mac80211: Add new sta_info getter by sta/vif addrs From: =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= To: Johannes Berg Cc: linux-wireless@vger.kernel.org, make-wifi-fast@lists.bufferbloat.net, ath10k@lists.infradead.org, John Crispin , Lorenzo Bianconi , Felix Fietkau , Kan Yan , Rajkumar Manoharan , Kevin Hayes Date: Sat, 16 Nov 2019 12:57:18 +0100 Message-ID: <157390543799.662247.14225450732789555896.stgit@toke.dk> In-Reply-To: <157390543688.662247.3735146484299260207.stgit@toke.dk> References: <157390543688.662247.3735146484299260207.stgit@toke.dk> User-Agent: StGit/0.21 MIME-Version: 1.0 X-MC-Unique: RKWHDo-eN4WZzo496X8XSg-1 X-Mimecast-Spam-Score: 0 Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Toke Høiland-Jørgensen In ieee80211_tx_status() we don't have an sdata struct when looking up the destination sta. Instead, we just do a lookup by the vif addr that is the source of the packet being completed. Factor this out into a new sta_info getter helper, since we need to use it for accounting AQL as well. Signed-off-by: Toke Høiland-Jørgensen --- net/mac80211/sta_info.c | 20 ++++++++++++++++++++ net/mac80211/sta_info.h | 3 +++ net/mac80211/status.c | 10 ++-------- 3 files changed, 25 insertions(+), 8 deletions(-) diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c index bd11fef2139f..465d83b13582 100644 --- a/net/mac80211/sta_info.c +++ b/net/mac80211/sta_info.c @@ -210,6 +210,26 @@ struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata, return NULL; } +struct sta_info *sta_info_get_by_addrs(struct ieee80211_local *local, + const u8 *sta_addr, const u8 *vif_addr) +{ + struct rhlist_head *tmp; + struct sta_info *sta; + + rcu_read_lock(); + for_each_sta_info(local, sta_addr, sta, tmp) { + if (ether_addr_equal(vif_addr, sta->sdata->vif.addr)) { + rcu_read_unlock(); + /* this is safe as the caller must already hold + * another rcu read section or the mutex + */ + return sta; + } + } + rcu_read_unlock(); + return NULL; +} + struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata, int idx) { diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h index 369c2dddce52..80e76569144e 100644 --- a/net/mac80211/sta_info.h +++ b/net/mac80211/sta_info.h @@ -725,6 +725,9 @@ struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata, struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata, const u8 *addr); +struct sta_info *sta_info_get_by_addrs(struct ieee80211_local *local, + const u8 *sta_addr, const u8 *vif_addr); + #define for_each_sta_info(local, _addr, _sta, _tmp) \ rhl_for_each_entry_rcu(_sta, _tmp, \ sta_info_hash_lookup(local, _addr), hash_node) diff --git a/net/mac80211/status.c b/net/mac80211/status.c index ab8ba5835ca0..0e51def35b8a 100644 --- a/net/mac80211/status.c +++ b/net/mac80211/status.c @@ -1073,19 +1073,13 @@ void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) .skb = skb, .info = IEEE80211_SKB_CB(skb), }; - struct rhlist_head *tmp; struct sta_info *sta; rcu_read_lock(); - for_each_sta_info(local, hdr->addr1, sta, tmp) { - /* skip wrong virtual interface */ - if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr)) - continue; - + sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2); + if (sta) status.sta = &sta->sta; - break; - } __ieee80211_tx_status(hw, &status); rcu_read_unlock(); From patchwork Sat Nov 16 11:57:19 2019 Content-Type: text/plain; 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[85.204.121.218]) by smtp.gmail.com with ESMTPSA id d28sm5671666lfn.33.2019.11.16.03.57.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 16 Nov 2019 03:57:20 -0800 (PST) Received: by alrua-x1.borgediget.toke.dk (Postfix, from userid 1000) id 2BC2B181914; Sat, 16 Nov 2019 12:57:19 +0100 (CET) Subject: [PATCH v10 2/4] mac80211: Import airtime calculation code from mt76 From: =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= To: Johannes Berg Cc: linux-wireless@vger.kernel.org, make-wifi-fast@lists.bufferbloat.net, ath10k@lists.infradead.org, John Crispin , Lorenzo Bianconi , Felix Fietkau , Kan Yan , Rajkumar Manoharan , Kevin Hayes Date: Sat, 16 Nov 2019 12:57:19 +0100 Message-ID: <157390543908.662247.10259646836977703692.stgit@toke.dk> In-Reply-To: <157390543688.662247.3735146484299260207.stgit@toke.dk> References: <157390543688.662247.3735146484299260207.stgit@toke.dk> User-Agent: StGit/0.21 MIME-Version: 1.0 X-MC-Unique: 5FIiwOW9Mx-oZGHWAC931Q-1 X-Mimecast-Spam-Score: 0 Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Toke Høiland-Jørgensen Felix recently added code to calculate airtime of packets to the mt76 driver. Import this into mac80211 so we can use it for airtime queue limit calculations. The airtime.c file is copied verbatim from the mt76 driver, and adjusted to be usable in mac80211. This involves: - Switching to mac80211 data structures. - Adding support for 160 MHz channels and HE mode. - Moving the symbol and duration calculations around a bit to avoid rounding with the higher rates and longer symbol times used for HE rates. The per-rate TX rate calculation is also split out to its own function so it can be used directly for the AQL calculations later. Signed-off-by: Toke Høiland-Jørgensen --- include/net/mac80211.h | 29 ++ net/mac80211/Makefile | 3 net/mac80211/airtime.c | 597 ++++++++++++++++++++++++++++++++++++++++++++ net/mac80211/ieee80211_i.h | 4 4 files changed, 632 insertions(+), 1 deletion(-) create mode 100644 net/mac80211/airtime.c diff --git a/include/net/mac80211.h b/include/net/mac80211.h index c643a19dce96..6fc26a051ba0 100644 --- a/include/net/mac80211.h +++ b/include/net/mac80211.h @@ -6424,4 +6424,33 @@ void ieee80211_nan_func_match(struct ieee80211_vif *vif, struct cfg80211_nan_match_params *match, gfp_t gfp); +/** + * ieee80211_calc_rx_airtime - calculate estimated transmission airtime for RX. + * + * This function calculates the estimated airtime usage of a frame based on the + * rate information in the RX status struct and the frame length. + * + * @hw: pointer as obtained from ieee80211_alloc_hw() + * @status: &struct ieee80211_rx_status containing the transmission rate + * information. + * @len: frame length in bytes + */ +u32 ieee80211_calc_rx_airtime(struct ieee80211_hw *hw, + struct ieee80211_rx_status *status, + int len); + +/** + * ieee80211_calc_tx_airtime - calculate estimated transmission airtime for TX. + * + * This function calculates the estimated airtime usage of a frame based on the + * rate information in the TX info struct and the frame length. + * + * @hw: pointer as obtained from ieee80211_alloc_hw() + * @info: &struct ieee80211_tx_info of the frame. + * @len: frame length in bytes + */ +u32 ieee80211_calc_tx_airtime(struct ieee80211_hw *hw, + struct ieee80211_tx_info *info, + int len); + #endif /* MAC80211_H */ diff --git a/net/mac80211/Makefile b/net/mac80211/Makefile index 4f03ebe732fa..6cbb1286d6c0 100644 --- a/net/mac80211/Makefile +++ b/net/mac80211/Makefile @@ -32,7 +32,8 @@ mac80211-y := \ chan.o \ trace.o mlme.o \ tdls.o \ - ocb.o + ocb.o \ + airtime.o mac80211-$(CONFIG_MAC80211_LEDS) += led.o mac80211-$(CONFIG_MAC80211_DEBUGFS) += \ diff --git a/net/mac80211/airtime.c b/net/mac80211/airtime.c new file mode 100644 index 000000000000..0c2a0bb94727 --- /dev/null +++ b/net/mac80211/airtime.c @@ -0,0 +1,597 @@ +// SPDX-License-Identifier: ISC +/* + * Copyright (C) 2019 Felix Fietkau + */ + +#include +#include "ieee80211_i.h" +#include "sta_info.h" + +#define AVG_PKT_SIZE 1024 + +/* Number of bits for an average sized packet */ +#define MCS_NBITS (AVG_PKT_SIZE << 3) + +/* Number of kilo-symbols (symbols * 1024) for a packet with (bps) bits per + * symbol. We use k-symbols to avoid rounding in the _TIME macros below. + */ +#define MCS_N_KSYMS(bps) DIV_ROUND_UP(MCS_NBITS << 10, (bps)) + +/* Transmission time (in 1024 * usec) for a packet containing (ksyms) * 1024 + * symbols. + */ +#define MCS_SYMBOL_TIME(sgi, ksyms) \ + (sgi ? \ + ((ksyms) * 4 * 18) / 20 : /* 3.6 us per sym */ \ + ((ksyms) * 4) /* 4.0 us per sym */ \ + ) + +/* Transmit duration for the raw data part of an average sized packet */ +#define MCS_DURATION(streams, sgi, bps) \ + ((u32)MCS_SYMBOL_TIME(sgi, MCS_N_KSYMS((streams) * (bps)))) + +#define MCS_DURATION_S(shift, streams, sgi, bps) \ + ((u16)((MCS_DURATION(streams, sgi, bps) >> shift))) + +/* These should match the values in enum nl80211_he_gi */ +#define HE_GI_08 0 +#define HE_GI_16 1 +#define HE_GI_32 2 + +/* Transmission time (1024 usec) for a packet containing (ksyms) * k-symbols */ +#define HE_SYMBOL_TIME(gi, ksyms) \ + (gi == HE_GI_08 ? \ + ((ksyms) * 16 * 17) / 20 : /* 13.6 us per sym */ \ + (gi == HE_GI_16 ? \ + ((ksyms) * 16 * 18) / 20 : /* 14.4 us per sym */ \ + ((ksyms) * 16) /* 16.0 us per sym */ \ + )) + +/* Transmit duration for the raw data part of an average sized packet */ +#define HE_DURATION(streams, gi, bps) \ + ((u32)HE_SYMBOL_TIME(gi, MCS_N_KSYMS((streams) * (bps)))) + +#define HE_DURATION_S(shift, streams, gi, bps) \ + (HE_DURATION(streams, gi, bps) >> shift) + +#define BW_20 0 +#define BW_40 1 +#define BW_80 2 +#define BW_160 3 + +/* + * Define group sort order: HT40 -> SGI -> #streams + */ +#define IEEE80211_MAX_STREAMS 4 +#define IEEE80211_HT_STREAM_GROUPS 4 /* BW(=2) * SGI(=2) */ +#define IEEE80211_VHT_STREAM_GROUPS 8 /* BW(=4) * SGI(=2) */ + +#define IEEE80211_HE_MAX_STREAMS 8 +#define IEEE80211_HE_STREAM_GROUPS 12 /* BW(=4) * GI(=3) */ + +#define IEEE80211_HT_GROUPS_NB (IEEE80211_MAX_STREAMS * \ + IEEE80211_HT_STREAM_GROUPS) +#define IEEE80211_VHT_GROUPS_NB (IEEE80211_MAX_STREAMS * \ + IEEE80211_VHT_STREAM_GROUPS) +#define IEEE80211_HE_GROUPS_NB (IEEE80211_HE_MAX_STREAMS * \ + IEEE80211_HE_STREAM_GROUPS) +#define IEEE80211_GROUPS_NB (IEEE80211_HT_GROUPS_NB + \ + IEEE80211_VHT_GROUPS_NB + \ + IEEE80211_HE_GROUPS_NB) + +#define IEEE80211_HT_GROUP_0 0 +#define IEEE80211_VHT_GROUP_0 (IEEE80211_HT_GROUP_0 + IEEE80211_HT_GROUPS_NB) +#define IEEE80211_HE_GROUP_0 (IEEE80211_VHT_GROUP_0 + IEEE80211_VHT_GROUPS_NB) + +#define MCS_GROUP_RATES 12 + +#define HT_GROUP_IDX(_streams, _sgi, _ht40) \ + IEEE80211_HT_GROUP_0 + \ + IEEE80211_MAX_STREAMS * 2 * _ht40 + \ + IEEE80211_MAX_STREAMS * _sgi + \ + _streams - 1 + +#define _MAX(a, b) (((a)>(b))?(a):(b)) + +#define GROUP_SHIFT(duration) \ + _MAX(0, 16 - __builtin_clz(duration)) + +/* MCS rate information for an MCS group */ +#define __MCS_GROUP(_streams, _sgi, _ht40, _s) \ + [HT_GROUP_IDX(_streams, _sgi, _ht40)] = { \ + .shift = _s, \ + .duration = { \ + MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 54 : 26), \ + MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 108 : 52), \ + MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 162 : 78), \ + MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 216 : 104), \ + MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 324 : 156), \ + MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 432 : 208), \ + MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 486 : 234), \ + MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 540 : 260) \ + } \ +} + +#define MCS_GROUP_SHIFT(_streams, _sgi, _ht40) \ + GROUP_SHIFT(MCS_DURATION(_streams, _sgi, _ht40 ? 54 : 26)) + +#define MCS_GROUP(_streams, _sgi, _ht40) \ + __MCS_GROUP(_streams, _sgi, _ht40, \ + MCS_GROUP_SHIFT(_streams, _sgi, _ht40)) + +#define VHT_GROUP_IDX(_streams, _sgi, _bw) \ + (IEEE80211_VHT_GROUP_0 + \ + IEEE80211_MAX_STREAMS * 2 * (_bw) + \ + IEEE80211_MAX_STREAMS * (_sgi) + \ + (_streams) - 1) + +#define BW2VBPS(_bw, r4, r3, r2, r1) \ + (_bw == BW_160 ? r4 : _bw == BW_80 ? r3 : _bw == BW_40 ? r2 : r1) + +#define __VHT_GROUP(_streams, _sgi, _bw, _s) \ + [VHT_GROUP_IDX(_streams, _sgi, _bw)] = { \ + .shift = _s, \ + .duration = { \ + MCS_DURATION_S(_s, _streams, _sgi, \ + BW2VBPS(_bw, 234, 117, 54, 26)), \ + MCS_DURATION_S(_s, _streams, _sgi, \ + BW2VBPS(_bw, 468, 234, 108, 52)), \ + MCS_DURATION_S(_s, _streams, _sgi, \ + BW2VBPS(_bw, 702, 351, 162, 78)), \ + MCS_DURATION_S(_s, _streams, _sgi, \ + BW2VBPS(_bw, 936, 468, 216, 104)), \ + MCS_DURATION_S(_s, _streams, _sgi, \ + BW2VBPS(_bw, 1404, 702, 324, 156)), \ + MCS_DURATION_S(_s, _streams, _sgi, \ + BW2VBPS(_bw, 1872, 936, 432, 208)), \ + MCS_DURATION_S(_s, _streams, _sgi, \ + BW2VBPS(_bw, 2106, 1053, 486, 234)), \ + MCS_DURATION_S(_s, _streams, _sgi, \ + BW2VBPS(_bw, 2340, 1170, 540, 260)), \ + MCS_DURATION_S(_s, _streams, _sgi, \ + BW2VBPS(_bw, 2808, 1404, 648, 312)), \ + MCS_DURATION_S(_s, _streams, _sgi, \ + BW2VBPS(_bw, 3120, 1560, 720, 346)) \ + } \ +} + +#define VHT_GROUP_SHIFT(_streams, _sgi, _bw) \ + GROUP_SHIFT(MCS_DURATION(_streams, _sgi, \ + BW2VBPS(_bw, 243, 117, 54, 26))) + +#define VHT_GROUP(_streams, _sgi, _bw) \ + __VHT_GROUP(_streams, _sgi, _bw, \ + VHT_GROUP_SHIFT(_streams, _sgi, _bw)) + + +#define HE_GROUP_IDX(_streams, _gi, _bw) \ + (IEEE80211_HE_GROUP_0 + \ + IEEE80211_HE_MAX_STREAMS * 2 * (_bw) + \ + IEEE80211_HE_MAX_STREAMS * (_gi) + \ + (_streams) - 1) + +#define __HE_GROUP(_streams, _gi, _bw, _s) \ + [HE_GROUP_IDX(_streams, _gi, _bw)] = { \ + .shift = _s, \ + .duration = { \ + HE_DURATION_S(_s, _streams, _gi, \ + BW2VBPS(_bw, 979, 489, 230, 115)), \ + HE_DURATION_S(_s, _streams, _gi, \ + BW2VBPS(_bw, 1958, 979, 475, 230)), \ + HE_DURATION_S(_s, _streams, _gi, \ + BW2VBPS(_bw, 2937, 1468, 705, 345)), \ + HE_DURATION_S(_s, _streams, _gi, \ + BW2VBPS(_bw, 3916, 1958, 936, 475)), \ + HE_DURATION_S(_s, _streams, _gi, \ + BW2VBPS(_bw, 5875, 2937, 1411, 705)), \ + HE_DURATION_S(_s, _streams, _gi, \ + BW2VBPS(_bw, 7833, 3916, 1872, 936)), \ + HE_DURATION_S(_s, _streams, _gi, \ + BW2VBPS(_bw, 8827, 4406, 2102, 1051)), \ + HE_DURATION_S(_s, _streams, _gi, \ + BW2VBPS(_bw, 9806, 4896, 2347, 1166)), \ + HE_DURATION_S(_s, _streams, _gi, \ + BW2VBPS(_bw, 11764, 5875, 2808, 1411)), \ + HE_DURATION_S(_s, _streams, _gi, \ + BW2VBPS(_bw, 13060, 6523, 3124, 1555)), \ + HE_DURATION_S(_s, _streams, _gi, \ + BW2VBPS(_bw, 14702, 7344, 3513, 1756)), \ + HE_DURATION_S(_s, _streams, _gi, \ + BW2VBPS(_bw, 16329, 8164, 3902, 1944)) \ + } \ +} + +#define HE_GROUP_SHIFT(_streams, _gi, _bw) \ + GROUP_SHIFT(HE_DURATION(_streams, _gi, \ + BW2VBPS(_bw, 979, 489, 230, 115))) + +#define HE_GROUP(_streams, _gi, _bw) \ + __HE_GROUP(_streams, _gi, _bw, \ + HE_GROUP_SHIFT(_streams, _gi, _bw)) +struct mcs_group { + u8 shift; + u16 duration[MCS_GROUP_RATES]; +}; + +static const struct mcs_group airtime_mcs_groups[] = { + MCS_GROUP(1, 0, BW_20), + MCS_GROUP(2, 0, BW_20), + MCS_GROUP(3, 0, BW_20), + MCS_GROUP(4, 0, BW_20), + + MCS_GROUP(1, 1, BW_20), + MCS_GROUP(2, 1, BW_20), + MCS_GROUP(3, 1, BW_20), + MCS_GROUP(4, 1, BW_20), + + MCS_GROUP(1, 0, BW_40), + MCS_GROUP(2, 0, BW_40), + MCS_GROUP(3, 0, BW_40), + MCS_GROUP(4, 0, BW_40), + + MCS_GROUP(1, 1, BW_40), + MCS_GROUP(2, 1, BW_40), + MCS_GROUP(3, 1, BW_40), + MCS_GROUP(4, 1, BW_40), + + VHT_GROUP(1, 0, BW_20), + VHT_GROUP(2, 0, BW_20), + VHT_GROUP(3, 0, BW_20), + VHT_GROUP(4, 0, BW_20), + + VHT_GROUP(1, 1, BW_20), + VHT_GROUP(2, 1, BW_20), + VHT_GROUP(3, 1, BW_20), + VHT_GROUP(4, 1, BW_20), + + VHT_GROUP(1, 0, BW_40), + VHT_GROUP(2, 0, BW_40), + VHT_GROUP(3, 0, BW_40), + VHT_GROUP(4, 0, BW_40), + + VHT_GROUP(1, 1, BW_40), + VHT_GROUP(2, 1, BW_40), + VHT_GROUP(3, 1, BW_40), + VHT_GROUP(4, 1, BW_40), + + VHT_GROUP(1, 0, BW_80), + VHT_GROUP(2, 0, BW_80), + VHT_GROUP(3, 0, BW_80), + VHT_GROUP(4, 0, BW_80), + + VHT_GROUP(1, 1, BW_80), + VHT_GROUP(2, 1, BW_80), + VHT_GROUP(3, 1, BW_80), + VHT_GROUP(4, 1, BW_80), + + VHT_GROUP(1, 0, BW_160), + VHT_GROUP(2, 0, BW_160), + VHT_GROUP(3, 0, BW_160), + VHT_GROUP(4, 0, BW_160), + + VHT_GROUP(1, 1, BW_160), + VHT_GROUP(2, 1, BW_160), + VHT_GROUP(3, 1, BW_160), + VHT_GROUP(4, 1, BW_160), + + HE_GROUP(1, HE_GI_08, BW_20), + HE_GROUP(2, HE_GI_08, BW_20), + HE_GROUP(3, HE_GI_08, BW_20), + HE_GROUP(4, HE_GI_08, BW_20), + HE_GROUP(5, HE_GI_08, BW_20), + HE_GROUP(6, HE_GI_08, BW_20), + HE_GROUP(7, HE_GI_08, BW_20), + HE_GROUP(8, HE_GI_08, BW_20), + + HE_GROUP(1, HE_GI_16, BW_20), + HE_GROUP(2, HE_GI_16, BW_20), + HE_GROUP(3, HE_GI_16, BW_20), + HE_GROUP(4, HE_GI_16, BW_20), + HE_GROUP(5, HE_GI_16, BW_20), + HE_GROUP(6, HE_GI_16, BW_20), + HE_GROUP(7, HE_GI_16, BW_20), + HE_GROUP(8, HE_GI_16, BW_20), + + HE_GROUP(1, HE_GI_32, BW_20), + HE_GROUP(2, HE_GI_32, BW_20), + HE_GROUP(3, HE_GI_32, BW_20), + HE_GROUP(4, HE_GI_32, BW_20), + HE_GROUP(5, HE_GI_32, BW_20), + HE_GROUP(6, HE_GI_32, BW_20), + HE_GROUP(7, HE_GI_32, BW_20), + HE_GROUP(8, HE_GI_32, BW_20), + + HE_GROUP(1, HE_GI_08, BW_40), + HE_GROUP(2, HE_GI_08, BW_40), + HE_GROUP(3, HE_GI_08, BW_40), + HE_GROUP(4, HE_GI_08, BW_40), + HE_GROUP(5, HE_GI_08, BW_40), + HE_GROUP(6, HE_GI_08, BW_40), + HE_GROUP(7, HE_GI_08, BW_40), + HE_GROUP(8, HE_GI_08, BW_40), + + HE_GROUP(1, HE_GI_16, BW_40), + HE_GROUP(2, HE_GI_16, BW_40), + HE_GROUP(3, HE_GI_16, BW_40), + HE_GROUP(4, HE_GI_16, BW_40), + HE_GROUP(5, HE_GI_16, BW_40), + HE_GROUP(6, HE_GI_16, BW_40), + HE_GROUP(7, HE_GI_16, BW_40), + HE_GROUP(8, HE_GI_16, BW_40), + + HE_GROUP(1, HE_GI_32, BW_40), + HE_GROUP(2, HE_GI_32, BW_40), + HE_GROUP(3, HE_GI_32, BW_40), + HE_GROUP(4, HE_GI_32, BW_40), + HE_GROUP(5, HE_GI_32, BW_40), + HE_GROUP(6, HE_GI_32, BW_40), + HE_GROUP(7, HE_GI_32, BW_40), + HE_GROUP(8, HE_GI_32, BW_40), + + HE_GROUP(1, HE_GI_08, BW_80), + HE_GROUP(2, HE_GI_08, BW_80), + HE_GROUP(3, HE_GI_08, BW_80), + HE_GROUP(4, HE_GI_08, BW_80), + HE_GROUP(5, HE_GI_08, BW_80), + HE_GROUP(6, HE_GI_08, BW_80), + HE_GROUP(7, HE_GI_08, BW_80), + HE_GROUP(8, HE_GI_08, BW_80), + + HE_GROUP(1, HE_GI_16, BW_80), + HE_GROUP(2, HE_GI_16, BW_80), + HE_GROUP(3, HE_GI_16, BW_80), + HE_GROUP(4, HE_GI_16, BW_80), + HE_GROUP(5, HE_GI_16, BW_80), + HE_GROUP(6, HE_GI_16, BW_80), + HE_GROUP(7, HE_GI_16, BW_80), + HE_GROUP(8, HE_GI_16, BW_80), + + HE_GROUP(1, HE_GI_32, BW_80), + HE_GROUP(2, HE_GI_32, BW_80), + HE_GROUP(3, HE_GI_32, BW_80), + HE_GROUP(4, HE_GI_32, BW_80), + HE_GROUP(5, HE_GI_32, BW_80), + HE_GROUP(6, HE_GI_32, BW_80), + HE_GROUP(7, HE_GI_32, BW_80), + HE_GROUP(8, HE_GI_32, BW_80), + + HE_GROUP(1, HE_GI_08, BW_160), + HE_GROUP(2, HE_GI_08, BW_160), + HE_GROUP(3, HE_GI_08, BW_160), + HE_GROUP(4, HE_GI_08, BW_160), + HE_GROUP(5, HE_GI_08, BW_160), + HE_GROUP(6, HE_GI_08, BW_160), + HE_GROUP(7, HE_GI_08, BW_160), + HE_GROUP(8, HE_GI_08, BW_160), + + HE_GROUP(1, HE_GI_16, BW_160), + HE_GROUP(2, HE_GI_16, BW_160), + HE_GROUP(3, HE_GI_16, BW_160), + HE_GROUP(4, HE_GI_16, BW_160), + HE_GROUP(5, HE_GI_16, BW_160), + HE_GROUP(6, HE_GI_16, BW_160), + HE_GROUP(7, HE_GI_16, BW_160), + HE_GROUP(8, HE_GI_16, BW_160), + + HE_GROUP(1, HE_GI_32, BW_160), + HE_GROUP(2, HE_GI_32, BW_160), + HE_GROUP(3, HE_GI_32, BW_160), + HE_GROUP(4, HE_GI_32, BW_160), + HE_GROUP(5, HE_GI_32, BW_160), + HE_GROUP(6, HE_GI_32, BW_160), + HE_GROUP(7, HE_GI_32, BW_160), + HE_GROUP(8, HE_GI_32, BW_160), +}; + +static u32 +ieee80211_calc_legacy_rate_duration(u16 bitrate, bool short_pre, + bool cck, int len) +{ + u32 duration; + + if (cck) { + duration = 144 + 48; /* preamble + PLCP */ + if (short_pre) + duration >>= 1; + + duration += 10; /* SIFS */ + } else { + duration = 20 + 16; /* premable + SIFS */ + } + + len <<= 3; + duration += (len * 10) / bitrate; + + return duration; +} + +u32 ieee80211_calc_rx_airtime(struct ieee80211_hw *hw, + struct ieee80211_rx_status *status, + int len) +{ + struct ieee80211_supported_band *sband; + const struct ieee80211_rate *rate; + bool sgi = status->enc_flags & RX_ENC_FLAG_SHORT_GI; + bool sp = status->enc_flags & RX_ENC_FLAG_SHORTPRE; + int bw, streams; + int group, idx; + u32 duration; + bool cck; + + switch (status->bw) { + case RATE_INFO_BW_20: + bw = BW_20; + break; + case RATE_INFO_BW_40: + bw = BW_40; + break; + case RATE_INFO_BW_80: + bw = BW_80; + break; + case RATE_INFO_BW_160: + bw = BW_160; + break; + default: + WARN_ON_ONCE(1); + return 0; + } + + switch (status->encoding) { + case RX_ENC_LEGACY: + if (WARN_ON_ONCE(status->band > NL80211_BAND_5GHZ)) + return 0; + + sband = hw->wiphy->bands[status->band]; + if (!sband || status->rate_idx > sband->n_bitrates) + return 0; + + rate = &sband->bitrates[status->rate_idx]; + cck = rate->flags & IEEE80211_RATE_MANDATORY_B; + + return ieee80211_calc_legacy_rate_duration(rate->bitrate, sp, + cck, len); + + case RX_ENC_VHT: + streams = status->nss; + idx = status->rate_idx; + group = VHT_GROUP_IDX(streams, sgi, bw); + break; + case RX_ENC_HT: + streams = ((status->rate_idx >> 3) & 3) + 1; + idx = status->rate_idx & 7; + group = HT_GROUP_IDX(streams, sgi, bw); + break; + case RX_ENC_HE: + streams = status->nss; + idx = status->rate_idx; + group = HE_GROUP_IDX(streams, status->he_gi, bw); + break; + default: + WARN_ON_ONCE(1); + return 0; + } + + if (WARN_ON_ONCE((status->encoding != RX_ENC_HE && streams > 4) || + (status->encoding == RX_ENC_HE && streams > 8))) + return 0; + + duration = airtime_mcs_groups[group].duration[idx]; + duration <<= airtime_mcs_groups[group].shift; + duration *= len; + duration /= AVG_PKT_SIZE; + duration /= 1024; + + duration += 36 + (streams << 2); + + return duration; +} +EXPORT_SYMBOL_GPL(ieee80211_calc_rx_airtime); + +static u32 ieee80211_calc_tx_airtime_rate(struct ieee80211_hw *hw, + struct ieee80211_tx_rate *rate, + u8 band, int len) +{ + struct ieee80211_rx_status stat = { + .band = band, + }; + + if (rate->idx < 0 || !rate->count) + return 0; + + if (rate->flags & IEEE80211_TX_RC_80_MHZ_WIDTH) + stat.bw = RATE_INFO_BW_80; + else if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) + stat.bw = RATE_INFO_BW_40; + else + stat.bw = RATE_INFO_BW_20; + + stat.enc_flags = 0; + if (rate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE) + stat.enc_flags |= RX_ENC_FLAG_SHORTPRE; + if (rate->flags & IEEE80211_TX_RC_SHORT_GI) + stat.enc_flags |= RX_ENC_FLAG_SHORT_GI; + + stat.rate_idx = rate->idx; + if (rate->flags & IEEE80211_TX_RC_VHT_MCS) { + stat.encoding = RX_ENC_VHT; + stat.rate_idx = ieee80211_rate_get_vht_mcs(rate); + stat.nss = ieee80211_rate_get_vht_nss(rate); + } else if (rate->flags & IEEE80211_TX_RC_MCS) { + stat.encoding = RX_ENC_HT; + } else { + stat.encoding = RX_ENC_LEGACY; + } + + return ieee80211_calc_rx_airtime(hw, &stat, len); +} + +u32 ieee80211_calc_tx_airtime(struct ieee80211_hw *hw, + struct ieee80211_tx_info *info, + int len) +{ + u32 duration = 0; + int i; + + for (i = 0; i < ARRAY_SIZE(info->status.rates); i++) { + struct ieee80211_tx_rate *rate = &info->status.rates[i]; + u32 cur_duration; + + cur_duration = ieee80211_calc_tx_airtime_rate(hw, rate, + info->band, len); + if (!cur_duration) + break; + + duration += cur_duration * rate->count; + } + + return duration; +} +EXPORT_SYMBOL_GPL(ieee80211_calc_tx_airtime); + +u32 ieee80211_calc_expected_tx_airtime(struct ieee80211_hw *hw, + struct ieee80211_vif *vif, + struct ieee80211_sta *pubsta, + int len) +{ + struct ieee80211_supported_band *sband; + struct ieee80211_chanctx_conf *conf; + int rateidx, shift = 0; + bool cck, short_pream; + u32 basic_rates; + u8 band = 0; + u16 rate; + + len += 38; /* Ethernet header length */ + + conf = rcu_dereference(vif->chanctx_conf); + if (conf) { + band = conf->def.chan->band; + shift = ieee80211_chandef_get_shift(&conf->def); + } + + if (pubsta) { + struct sta_info *sta = container_of(pubsta, struct sta_info, + sta); + + return ieee80211_calc_tx_airtime_rate(hw, + &sta->tx_stats.last_rate, + band, len); + } + + if (!conf) + return 0; + + /* No station to get latest rate from, so calculate the worst-case + * duration using the lowest configured basic rate. + */ + sband = hw->wiphy->bands[band]; + + basic_rates = vif->bss_conf.basic_rates; + short_pream = vif->bss_conf.use_short_preamble; + + rateidx = basic_rates ? ffs(basic_rates) - 1 : 0; + rate = sband->bitrates[rateidx].bitrate << shift; + cck = sband->bitrates[rateidx].flags & IEEE80211_RATE_MANDATORY_B; + + return ieee80211_calc_legacy_rate_duration(rate, short_pream, cck, len); +} diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index 05406e9c05b3..225ea4e3cd76 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -2249,6 +2249,10 @@ const char *ieee80211_get_reason_code_string(u16 reason_code); extern const struct ethtool_ops ieee80211_ethtool_ops; +u32 ieee80211_calc_expected_tx_airtime(struct ieee80211_hw *hw, + struct ieee80211_vif *vif, + struct ieee80211_sta *pubsta, + int len); #ifdef CONFIG_MAC80211_NOINLINE #define debug_noinline noinline #else From patchwork Sat Nov 16 11:57:20 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= X-Patchwork-Id: 11247549 X-Patchwork-Delegate: johannes@sipsolutions.net Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org 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z15sm1475941lfg.0.2019.11.16.03.57.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 16 Nov 2019 03:57:20 -0800 (PST) Received: by alrua-x1.borgediget.toke.dk (Postfix, from userid 1000) id 44229181916; Sat, 16 Nov 2019 12:57:20 +0100 (CET) Subject: [PATCH v10 3/4] mac80211: Implement Airtime-based Queue Limit (AQL) From: =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= To: Johannes Berg Cc: linux-wireless@vger.kernel.org, make-wifi-fast@lists.bufferbloat.net, ath10k@lists.infradead.org, John Crispin , Lorenzo Bianconi , Felix Fietkau , Kan Yan , Rajkumar Manoharan , Kevin Hayes Date: Sat, 16 Nov 2019 12:57:20 +0100 Message-ID: <157390544018.662247.937727760317807167.stgit@toke.dk> In-Reply-To: <157390543688.662247.3735146484299260207.stgit@toke.dk> References: <157390543688.662247.3735146484299260207.stgit@toke.dk> User-Agent: StGit/0.21 MIME-Version: 1.0 X-MC-Unique: gvc28aR5MNGiDeHn_fQ7FQ-1 X-Mimecast-Spam-Score: 0 Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Kan Yan In order for the Fq_CoDel algorithm integrated in mac80211 layer to operate effectively to control excessive queueing latency, the CoDel algorithm requires an accurate measure of how long packets stays in the queue, AKA sojourn time. The sojourn time measured at the mac80211 layer doesn't include queueing latency in the 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 stay 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. The Byte Queue Limits (BQL) mechanism is commonly used to address the similar issue with wired network interface. However, this method cannot be applied directly to the wireless network interface. "Bytes" 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 implements an Airtime-based Queue Limit (AQL) to make CoDel work effectively with wireless drivers that utilized firmware/hardware offloading. AQL allows each txq to release just enough packets to the lower layer to form 1-2 large aggregations to keep hardware fully utilized and retains the rest of the frames in mac80211 layer to be controlled by the CoDel algorithm. Signed-off-by: Kan Yan [ Toke: Keep API to set pending airtime internal, fix nits in commit msg ] Signed-off-by: Toke Høiland-Jørgensen --- include/net/cfg80211.h | 7 ++++ include/net/mac80211.h | 12 ++++++ net/mac80211/debugfs.c | 85 ++++++++++++++++++++++++++++++++++++++++++++ net/mac80211/debugfs_sta.c | 43 +++++++++++++++++----- net/mac80211/ieee80211_i.h | 4 ++ net/mac80211/main.c | 10 +++++ net/mac80211/sta_info.c | 38 ++++++++++++++++++++ net/mac80211/sta_info.h | 8 ++++ net/mac80211/tx.c | 47 +++++++++++++++++++++++- 9 files changed, 240 insertions(+), 14 deletions(-) diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h index e309cc826b40..4f75dbdd406a 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -2606,6 +2606,13 @@ 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 6fc26a051ba0..ba3f33cc41ea 100644 --- a/include/net/mac80211.h +++ b/include/net/mac80211.h @@ -5565,6 +5565,18 @@ 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_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 568b3b276931..399d4e8b8546 100644 --- a/net/mac80211/debugfs.c +++ b/net/mac80211/debugfs.c @@ -148,6 +148,87 @@ 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, q_limit_low_old, q_limit_high_old; + 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; + + q_limit_low_old = local->aql_txq_limit_low[ac]; + q_limit_high_old = local->aql_txq_limit_high[ac]; + + 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) { + /* If a sta has customized queue limits, keep it */ + if (sta->airtime[ac].aql_limit_low == q_limit_low_old && + sta->airtime[ac].aql_limit_high == q_limit_high_old) { + 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, @@ -441,6 +522,10 @@ 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..0185e6e5e5d1 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; spin_unlock_bh(&local->active_txq_lock[ac]); + q_depth[ac] = atomic_read(&sta->airtime[ac].aql_tx_pending); } 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 225ea4e3cd76..ad15b3be8bb3 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; + atomic_t aql_total_pending_airtime; const struct ieee80211_ops *ops; diff --git a/net/mac80211/main.c b/net/mac80211/main.c index aba094b4ccfc..071ea92a3748 100644 --- a/net/mac80211/main.c +++ b/net/mac80211/main.c @@ -667,8 +667,16 @@ 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; + atomic_set(&local->aql_total_pending_airtime, 0); 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 465d83b13582..1fe02022a31a 100644 --- a/net/mac80211/sta_info.c +++ b/net/mac80211/sta_info.c @@ -416,6 +416,9 @@ 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; + atomic_set(&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++) @@ -1913,6 +1916,41 @@ 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_local *local, + struct sta_info *sta, u8 ac, + u16 tx_airtime, bool tx_completed) +{ + int tx_pending; + + if (!tx_completed) { + if (sta) + atomic_add(tx_airtime, + &sta->airtime[ac].aql_tx_pending); + + atomic_add(tx_airtime, &local->aql_total_pending_airtime); + return; + } + + if (sta) { + tx_pending = atomic_sub_return(tx_airtime, + &sta->airtime[ac].aql_tx_pending); + if (WARN_ONCE(tx_pending < 0, + "STA %pM AC %d txq pending airtime underflow: %u, %u", + sta->addr, ac, tx_pending, tx_airtime)) + atomic_cmpxchg(&sta->airtime[ac].aql_tx_pending, + tx_pending, 0); + } + + tx_pending = atomic_sub_return(tx_airtime, + &local->aql_total_pending_airtime); + if (WARN_ONCE(tx_pending < 0, + "Device %s AC %d pending airtime underflow: %u, %u", + wiphy_name(local->hw.wiphy), ac, tx_pending, + tx_airtime)) + atomic_cmpxchg(&local->aql_total_pending_airtime, + tx_pending, 0); +} + 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 80e76569144e..0608d49b3826 100644 --- a/net/mac80211/sta_info.h +++ b/net/mac80211/sta_info.h @@ -127,13 +127,21 @@ 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; + atomic_t aql_tx_pending; /* Estimated airtime for frames pending */ + u32 aql_limit_low; + u32 aql_limit_high; }; +void ieee80211_sta_update_pending_airtime(struct ieee80211_local *local, + struct sta_info *sta, u8 ac, + u16 tx_airtime, bool tx_completed); + struct sta_info; /** diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index db38be1b75fa..aafc67b562eb 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -3674,7 +3674,8 @@ 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]); @@ -3685,13 +3686,26 @@ 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; @@ -3745,6 +3759,33 @@ 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 (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < + sta->airtime[txq->ac].aql_limit_low) + return true; + + if (atomic_read(&local->aql_total_pending_airtime) < + local->aql_threshold && + atomic_read(&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 Sat Nov 16 11:57:21 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= X-Patchwork-Id: 11247553 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 1BC676C1 for ; 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[85.204.121.218]) by smtp.gmail.com with ESMTPSA id 12sm5430059lju.55.2019.11.16.03.57.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 16 Nov 2019 03:57:22 -0800 (PST) Received: by alrua-x1.borgediget.toke.dk (Postfix, from userid 1000) id 5DFF6181918; Sat, 16 Nov 2019 12:57:21 +0100 (CET) Subject: [PATCH v10 4/4] mac80211: Use Airtime-based Queue Limits (AQL) on packet dequeue From: =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= To: Johannes Berg Cc: linux-wireless@vger.kernel.org, make-wifi-fast@lists.bufferbloat.net, ath10k@lists.infradead.org, John Crispin , Lorenzo Bianconi , Felix Fietkau , Kan Yan , Rajkumar Manoharan , Kevin Hayes Date: Sat, 16 Nov 2019 12:57:21 +0100 Message-ID: <157390544128.662247.18090629768427352084.stgit@toke.dk> In-Reply-To: <157390543688.662247.3735146484299260207.stgit@toke.dk> References: <157390543688.662247.3735146484299260207.stgit@toke.dk> User-Agent: StGit/0.21 MIME-Version: 1.0 X-MC-Unique: gPDAFj4XOlisPtSZzj4gcQ-1 X-Mimecast-Spam-Score: 0 Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Toke Høiland-Jørgensen The previous commit added the ability to throttle stations when they queue too much airtime in the hardware. This commit enables the functionality by calculating the expected airtime usage of each packet that is dequeued from the TXQs in mac80211, and accounting that as pending airtime. The estimated airtime for each skb is stored in the tx_info, so we can subtract the same amount from the running total when the skb is freed or recycled. The throttling mechanism relies on this accounting to be accurate (i.e., that we are not freeing skbs without subtracting any airtime they were accounted for), so we put the subtraction into ieee80211_report_used_skb(). As an optimisation, we also subtract the airtime on regular TX completion, zeroing out the value stored in the packet afterwards, to avoid having to do an expensive lookup of the station from the packet data on every packet. This patch does *not* include any mechanism to wake a throttled TXQ again, on the assumption that this will happen anyway as a side effect of whatever freed the skb (most commonly a TX completion). Signed-off-by: Toke Høiland-Jørgensen --- include/net/mac80211.h | 16 ++++++++++++++++ net/mac80211/status.c | 26 ++++++++++++++++++++++++++ net/mac80211/tx.c | 18 ++++++++++++++++++ 3 files changed, 60 insertions(+) diff --git a/include/net/mac80211.h b/include/net/mac80211.h index ba3f33cc41ea..aa145808e57a 100644 --- a/include/net/mac80211.h +++ b/include/net/mac80211.h @@ -1060,6 +1060,22 @@ struct ieee80211_tx_info { }; }; +static inline u16 +ieee80211_info_set_tx_time_est(struct ieee80211_tx_info *info, u16 tx_time_est) +{ + /* We only have 10 bits in tx_time_est, so store airtime + * in increments of 4us and clamp the maximum to 2**12-1 + */ + info->tx_time_est = min_t(u16, tx_time_est, 4095) >> 2; + return info->tx_time_est << 2; +} + +static inline u16 +ieee80211_info_get_tx_time_est(struct ieee80211_tx_info *info) +{ + return info->tx_time_est << 2; +} + /** * struct ieee80211_tx_status - extended tx status info for rate control * diff --git a/net/mac80211/status.c b/net/mac80211/status.c index 0e51def35b8a..39da82b35be9 100644 --- a/net/mac80211/status.c +++ b/net/mac80211/status.c @@ -670,12 +670,26 @@ static void ieee80211_report_used_skb(struct ieee80211_local *local, struct sk_buff *skb, bool dropped) { struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); + u16 tx_time_est = ieee80211_info_get_tx_time_est(info); struct ieee80211_hdr *hdr = (void *)skb->data; bool acked = info->flags & IEEE80211_TX_STAT_ACK; if (dropped) acked = false; + if (tx_time_est) { + struct sta_info *sta; + + rcu_read_lock(); + + sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2); + ieee80211_sta_update_pending_airtime(local, sta, + skb_get_queue_mapping(skb), + tx_time_est, + true); + rcu_read_unlock(); + } + if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) { struct ieee80211_sub_if_data *sdata; @@ -877,6 +891,7 @@ static void __ieee80211_tx_status(struct ieee80211_hw *hw, struct ieee80211_bar *bar; int shift = 0; int tid = IEEE80211_NUM_TIDS; + u16 tx_time_est; rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count); @@ -986,6 +1001,17 @@ static void __ieee80211_tx_status(struct ieee80211_hw *hw, ieee80211_sta_register_airtime(&sta->sta, tid, info->status.tx_time, 0); + if ((tx_time_est = ieee80211_info_get_tx_time_est(info)) > 0) { + /* Do this here to avoid the expensive lookup of the sta + * in ieee80211_report_used_skb(). + */ + ieee80211_sta_update_pending_airtime(local, sta, + skb_get_queue_mapping(skb), + tx_time_est, + true); + ieee80211_info_set_tx_time_est(info, 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 aafc67b562eb..2fb6571453e7 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -3551,6 +3551,9 @@ struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, WARN_ON_ONCE(softirq_count() == 0); + if (!ieee80211_txq_airtime_check(hw, txq)) + return NULL; + begin: spin_lock_bh(&fq->lock); @@ -3661,6 +3664,21 @@ struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, } IEEE80211_SKB_CB(skb)->control.vif = vif; + + if (local->airtime_flags & AIRTIME_USE_AQL) { + u32 airtime; + + airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, + skb->len); + if (airtime) { + airtime = ieee80211_info_set_tx_time_est(info, airtime); + ieee80211_sta_update_pending_airtime(local, tx.sta, + txq->ac, + airtime, + false); + } + } + return skb; out: