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mac80211: mask nested A-MSDU support for mesh

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mac80211 incorrectly processes A-MSDUs contained in A-MPDU frames. This
results in dropped packets and severely impacted throughput.

As a workaround, don't indicate support for A-MSDUs contained in
A-MPDUs. This improves throughput over mesh links by factor 10.

Ref: https://github.com/openwrt/mt76/issues/450

Signed-off-by: David Bauer <mail@david-bauer.net>
This commit is contained in:
David Bauer 2021-10-08 00:30:23 +02:00
parent 185541f50f
commit f96744ba6b
1 changed files with 31 additions and 0 deletions
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31
package/kernel/mac80211/patches/subsys/800-mac80211-mask-nested-A-MSDU-support-for-mesh.patch Normal file
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@ -0,0 +1,31 @@
From 313d8c18385f10957402b475f9b0c209ceab6c5a Mon Sep 17 00:00:00 2001
From: David Bauer <mail@david-bauer.net>
Date: Fri, 8 Oct 2021 00:25:19 +0200
Subject: [PATCH] mac80211: mask nested A-MSDU support for mesh
mac80211 incorrectly processes A-MSDUs contained in A-MPDU frames. This
results in dropped packets and severely impacted throughput.
As a workaround, don't indicate support for A-MSDUs contained in
A-MPDUs. This improves throughput over mesh links by factor 10.
Ref: https://github.com/openwrt/mt76/issues/450
Signed-off-by: David Bauer <mail@david-bauer.net>
---
net/mac80211/agg-rx.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/net/mac80211/agg-rx.c
+++ b/net/mac80211/agg-rx.c
@@ -251,7 +251,9 @@ static void ieee80211_send_addba_resp(st
mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
- capab = u16_encode_bits(amsdu, IEEE80211_ADDBA_PARAM_AMSDU_MASK);
+ capab = 0;
+ if (!sta->mesh)
+ capab = u16_encode_bits(amsdu, IEEE80211_ADDBA_PARAM_AMSDU_MASK);
capab |= u16_encode_bits(policy, IEEE80211_ADDBA_PARAM_POLICY_MASK);
capab |= u16_encode_bits(tid, IEEE80211_ADDBA_PARAM_TID_MASK);
capab |= u16_encode_bits(buf_size, IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK);