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Subject: [PATCH v4 1/4] mac80211: Shrink the size of ack_frame_id to make room
 for tx_time_est
From:   =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= <toke@redhat.com>
To:     Johannes Berg <johannes@sipsolutions.net>
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>
Date:   Sat, 19 Oct 2019 13:37:15 +0200
Message-ID: <157148503526.2989444.13871793436722188173.stgit@toke.dk>
In-Reply-To: <157148503415.2989444.7391437309981941226.stgit@toke.dk>
References: <157148503415.2989444.7391437309981941226.stgit@toke.dk>
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From: Toke H=C3=B8iland-J=C3=B8rgensen <toke@redhat.com>

To implement airtime queue limiting, we need to keep a running account of
the estimated airtime of all skbs queued into the device. Do to this
correctly, we need to store the airtime estimate into the skb so we can
decrease the outstanding balance when the skb is freed. This means that the
time estimate must be stored somewhere that will survive for the lifetime
of the skb.

To get this, decrease the size of the ack_frame_id field to 6 bits, and
lower the size of the ID space accordingly. This leaves 10 bits for use for
tx_time_est, which is enough to store a maximum of 4096 us, if we shift the
values so they become units of 4us.

Signed-off-by: Toke H=C3=B8iland-J=C3=B8rgensen <toke@redhat.com>
---
 include/net/mac80211.h |    4 +++-
 net/mac80211/cfg.c     |    2 +-
 net/mac80211/tx.c      |    2 +-
 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index d69081c38788..4288ace72c2b 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -967,6 +967,7 @@ ieee80211_rate_get_vht_nss(const struct ieee80211_tx_ra=
te *rate)
  * @band: the band to transmit on (use for checking for races)
  * @hw_queue: HW queue to put the frame on, skb_get_queue_mapping() gives =
the AC
  * @ack_frame_id: internal frame ID for TX status, used internally
+ * @tx_time_est: TX time estimate in units of 4us, used internally
  * @control: union part for control data
  * @control.rates: TX rates array to try
  * @control.rts_cts_rate_idx: rate for RTS or CTS
@@ -1007,7 +1008,8 @@ struct ieee80211_tx_info {
=20
 =09u8 hw_queue;
=20
-=09u16 ack_frame_id;
+=09u16 ack_frame_id:6;
+=09u16 tx_time_est:10;
=20
 =09union {
 =09=09struct {
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 70739e746c13..4fb7f1f12109 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -3428,7 +3428,7 @@ int ieee80211_attach_ack_skb(struct ieee80211_local *=
local, struct sk_buff *skb,
=20
 =09spin_lock_irqsave(&local->ack_status_lock, spin_flags);
 =09id =3D idr_alloc(&local->ack_status_frames, ack_skb,
-=09=09       1, 0x10000, GFP_ATOMIC);
+=09=09       1, 0x40, GFP_ATOMIC);
 =09spin_unlock_irqrestore(&local->ack_status_lock, spin_flags);
=20
 =09if (id < 0) {
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 938c10f7955b..a16c2f863702 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -2719,7 +2719,7 @@ static struct sk_buff *ieee80211_build_hdr(struct iee=
e80211_sub_if_data *sdata,
=20
 =09=09=09spin_lock_irqsave(&local->ack_status_lock, flags);
 =09=09=09id =3D idr_alloc(&local->ack_status_frames, ack_skb,
-=09=09=09=09       1, 0x10000, GFP_ATOMIC);
+=09=09=09=09       1, 0x40, GFP_ATOMIC);
 =09=09=09spin_unlock_irqrestore(&local->ack_status_lock, flags);
=20
 =09=09=09if (id >=3D 0) {