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mac80211: fix reordering of buffered broadcast packets

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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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Felix Fietkau 2018-11-28 22:42:25 +01:00
parent 87b874d4d6
commit 5ffacceb7b
1 changed files with 28 additions and 0 deletions
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package/kernel/mac80211/patches/subsys/380-mac80211-fix-reordering-of-buffered-broadcast-packet.patch Normal file
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From: Felix Fietkau <nbd@nbd.name>
Date: Wed, 28 Nov 2018 22:36:06 +0100
Subject: [PATCH] mac80211: fix reordering of buffered broadcast packets
If the buffered broadcast queue contains packets, letting new packets bypass
that queue can lead to heavy reordering, since the driver is probably throttling
transmission of buffered multicast packets after beacons.
Keep buffering packets until the buffer has been cleared (and no client
is in powersave mode).
Cc: stable@vger.kernel.org
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -435,8 +435,8 @@ ieee80211_tx_h_multicast_ps_buf(struct i
if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
info->hw_queue = tx->sdata->vif.cab_queue;
- /* no stations in PS mode */
- if (!atomic_read(&ps->num_sta_ps))
+ /* no stations in PS mode and no buffered packets */
+ if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf))
return TX_CONTINUE;
info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;