From: Johannes Berg <johannes@sipsolutions.net> To: "Toke Høiland-Jørgensen" <toke@redhat.com> Cc: linux-wireless@vger.kernel.org, make-wifi-fast@lists.bufferbloat.net, ath10k@lists.infradead.org, John Crispin <john@phrozen.org>, Lorenzo Bianconi <lorenzo@kernel.org>, Felix Fietkau <nbd@nbd.name>, Kan Yan <kyan@google.com>, Rajkumar Manoharan <rmanohar@codeaurora.org>, Kevin Hayes <kevinhayes@google.com> Subject: Re: [PATCH v6 2/4] mac80211: Import airtime calculation code from mt76 Date: Fri, 08 Nov 2019 11:07:41 +0100 [thread overview] Message-ID: <42266e95f45d5772e04c9c016bd6179ea14ffefa.camel@sipsolutions.net> (raw) In-Reply-To: <157182474174.150713.17459330922820192258.stgit@toke.dk> On Wed, 2019-10-23 at 11:59 +0200, Toke Høiland-Jørgensen wrote: > From: Toke Høiland-Jørgensen <toke@redhat.com> > > 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 later. > > The airtime.c file is copied verbatim from the mt76 driver, and adjusted to > use mac80211 data structures instead (which is fairly straight forward). > The per-rate TX rate calculation is split out to its own > function (ieee80211_calc_tx_airtime_rate()) so it can be used directly for > the AQL calculations added in a subsequent patch. Any way it could be exposed by mac80211 back to the drivers, perhaps, to share it? > The only thing that it was not possible to port directly was the bit that > read the internal driver flags of struct ieee80211_rate to determine > whether a rate is using CCK or OFDM encoding. Instead, just look at the > rate index, since at least mt76 and ath10k both seem to have the same > number of CCK rates (4) in their tables. This is highly questionable ... > + 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 = (status->rate_idx < CCK_NUM_RATES); Why not cck = rate->flags & IEEE80211_RATE_MANDATORY_B; I mean .. we know that IEEE80211_RATE_MANDATORY_B rates are exactly the CCK rates, and that's not really going to change? Alternatively, we could do cck = sband->band == NL80211_BAND_2GHZ && !(rate->flags & IEEE80211_RATE_ERP_G); or even cck = rate->bitrate == 10 || rate->bitrate == 20 || rate->bitrate == 55 || rate->bitrate == 110; :) > + default: > + WARN_ON_ONCE(1); You can't do that in mac80211 either. That might be fine for mt76, but mac80211 already supports HE. johannes
WARNING: multiple messages have this Message-ID (diff)
From: Johannes Berg <johannes@sipsolutions.net> To: "Toke Høiland-Jørgensen" <toke@redhat.com> Cc: Kan Yan <kyan@google.com>, Rajkumar Manoharan <rmanohar@codeaurora.org>, Kevin Hayes <kevinhayes@google.com>, make-wifi-fast@lists.bufferbloat.net, linux-wireless@vger.kernel.org, ath10k@lists.infradead.org, John Crispin <john@phrozen.org>, Lorenzo Bianconi <lorenzo@kernel.org>, Felix Fietkau <nbd@nbd.name> Subject: Re: [PATCH v6 2/4] mac80211: Import airtime calculation code from mt76 Date: Fri, 08 Nov 2019 11:07:41 +0100 [thread overview] Message-ID: <42266e95f45d5772e04c9c016bd6179ea14ffefa.camel@sipsolutions.net> (raw) In-Reply-To: <157182474174.150713.17459330922820192258.stgit@toke.dk> On Wed, 2019-10-23 at 11:59 +0200, Toke Høiland-Jørgensen wrote: > From: Toke Høiland-Jørgensen <toke@redhat.com> > > 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 later. > > The airtime.c file is copied verbatim from the mt76 driver, and adjusted to > use mac80211 data structures instead (which is fairly straight forward). > The per-rate TX rate calculation is split out to its own > function (ieee80211_calc_tx_airtime_rate()) so it can be used directly for > the AQL calculations added in a subsequent patch. Any way it could be exposed by mac80211 back to the drivers, perhaps, to share it? > The only thing that it was not possible to port directly was the bit that > read the internal driver flags of struct ieee80211_rate to determine > whether a rate is using CCK or OFDM encoding. Instead, just look at the > rate index, since at least mt76 and ath10k both seem to have the same > number of CCK rates (4) in their tables. This is highly questionable ... > + 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 = (status->rate_idx < CCK_NUM_RATES); Why not cck = rate->flags & IEEE80211_RATE_MANDATORY_B; I mean .. we know that IEEE80211_RATE_MANDATORY_B rates are exactly the CCK rates, and that's not really going to change? Alternatively, we could do cck = sband->band == NL80211_BAND_2GHZ && !(rate->flags & IEEE80211_RATE_ERP_G); or even cck = rate->bitrate == 10 || rate->bitrate == 20 || rate->bitrate == 55 || rate->bitrate == 110; :) > + default: > + WARN_ON_ONCE(1); You can't do that in mac80211 either. That might be fine for mt76, but mac80211 already supports HE. johannes _______________________________________________ ath10k mailing list ath10k@lists.infradead.org http://lists.infradead.org/mailman/listinfo/ath10k
next prev parent reply other threads:[~2019-11-08 10:07 UTC|newest] Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-10-23 9:58 [PATCH v6 0/4] Add Airtime Queue Limits (AQL) to mac80211 Toke Høiland-Jørgensen 2019-10-23 9:58 ` Toke Høiland-Jørgensen 2019-10-23 9:59 ` [PATCH v6 1/4] mac80211: Shrink the size of ack_frame_id to make room for tx_time_est Toke Høiland-Jørgensen 2019-10-23 9:59 ` Toke Høiland-Jørgensen 2019-11-08 10:03 ` Johannes Berg 2019-11-08 10:03 ` Johannes Berg 2019-10-23 9:59 ` [PATCH v6 2/4] mac80211: Import airtime calculation code from mt76 Toke Høiland-Jørgensen 2019-10-23 9:59 ` Toke Høiland-Jørgensen 2019-11-08 10:07 ` Johannes Berg [this message] 2019-11-08 10:07 ` Johannes Berg 2019-11-08 10:55 ` Toke Høiland-Jørgensen 2019-11-08 10:55 ` Toke Høiland-Jørgensen 2019-11-08 10:57 ` Johannes Berg 2019-11-08 10:57 ` Johannes Berg 2019-10-23 9:59 ` [PATCH v6 3/4] mac80211: Implement Airtime-based Queue Limit (AQL) Toke Høiland-Jørgensen 2019-10-23 9:59 ` Toke Høiland-Jørgensen 2019-11-08 10:09 ` Johannes Berg 2019-11-08 10:09 ` Johannes Berg 2019-11-08 10:56 ` Toke Høiland-Jørgensen 2019-11-08 10:56 ` Toke Høiland-Jørgensen 2019-11-08 10:59 ` Johannes Berg 2019-11-08 10:59 ` Johannes Berg 2019-11-08 11:10 ` Toke Høiland-Jørgensen 2019-11-08 11:10 ` Toke Høiland-Jørgensen 2019-11-08 11:17 ` Johannes Berg 2019-11-08 11:17 ` Johannes Berg 2019-11-09 1:22 ` Kan Yan 2019-11-09 1:22 ` Kan Yan 2019-11-09 11:22 ` Toke Høiland-Jørgensen 2019-11-09 11:22 ` Toke Høiland-Jørgensen 2019-10-23 9:59 ` [PATCH v6 4/4] mac80211: Use Airtime-based Queue Limits (AQL) on packet dequeue Toke Høiland-Jørgensen 2019-10-23 9:59 ` Toke Høiland-Jørgensen 2019-11-08 10:17 ` Johannes Berg 2019-11-08 10:17 ` Johannes Berg 2019-11-08 11:01 ` Toke Høiland-Jørgensen 2019-11-08 11:01 ` Toke Høiland-Jørgensen 2019-11-08 11:05 ` Johannes Berg 2019-11-08 11:05 ` Johannes Berg 2019-11-07 6:14 ` [PATCH v6 0/4] Add Airtime Queue Limits (AQL) to mac80211 Kan Yan 2019-11-07 6:14 ` Kan Yan 2019-11-07 10:55 ` Toke Høiland-Jørgensen 2019-11-07 10:55 ` Toke Høiland-Jørgensen 2019-11-07 21:24 ` [Make-wifi-fast] " Dave Taht
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