netdev - [PATCH AUTOSEL 5.15 04/29] mac80211: fix TCP performance on mesh interface

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Date:   Mon, 20 Dec 2021 20:57:25 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Maxime Bizon <mbizon@...ebox.fr>,
        Johannes Berg <johannes.berg@...el.com>,
        Sasha Levin <sashal@...nel.org>, johannes@...solutions.net,
        davem@...emloft.net, kuba@...nel.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.15 04/29] mac80211: fix TCP performance on mesh interface

From: Maxime Bizon <mbizon@...ebox.fr>

[ Upstream commit 48c06708e63e71b4395e4159797366aa03be10ff ]

sta is NULL for mesh point (resolved later), so sk pacing parameters
were not applied.

Signed-off-by: Maxime Bizon <mbizon@...ebox.fr>
Link: https://lore.kernel.org/r/66f51659416ac35d6b11a313bd3ffe8b8a43dd55.camel@freebox.fr
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/mac80211/tx.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 0527bf41a32c7..0613b3ab523a5 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -4190,11 +4190,11 @@ void __ieee80211_subif_start_xmit(struct sk_buff *skb,
 
 	ieee80211_aggr_check(sdata, sta, skb);
 
+	sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift);
+
 	if (sta) {
 		struct ieee80211_fast_tx *fast_tx;
 
-		sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift);
-
 		fast_tx = rcu_dereference(sta->fast_tx);
 
 		if (fast_tx &&
-- 
2.34.1