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kernel: backport a fix for multiqueue selection to prevent tcp reordering with fair queueing

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Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38016 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
Felix Fietkau
2013-09-17 10:07:52 +00:00
parent a37971c70e
commit 731f8ee3a8
1 changed files with 41 additions and 0 deletions
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41
target/linux/generic/patches-3.10/110-net_fix_multiqueue_selection.patch Normal file
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@@ -0,0 +1,41 @@
From: Eric Dumazet <edumazet@google.com>
commit 416186fbf8c5b4e4465 ("net: Split core bits of netdev_pick_tx
into __netdev_pick_tx") added a bug that disables caching of queue
index in the socket.
This is the source of packet reorders for TCP flows, and
again this is happening more often when using FQ pacing.
Old code was doing
if (queue_index != old_index)
sk_tx_queue_set(sk, queue_index);
Alexander renamed the variables but forgot to change sk_tx_queue_set()
2nd parameter.
if (queue_index != new_index)
sk_tx_queue_set(sk, queue_index);
This means we store -1 over and over in sk->sk_tx_queue_mapping
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Alexander Duyck <alexander.h.duyck@intel.com>
Acked-by: Alexander Duyck <alexander.h.duyck@intel.com>
---
net/core/flow_dissector.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -347,7 +347,7 @@ u16 __netdev_pick_tx(struct net_device *
if (queue_index != new_index && sk &&
rcu_access_pointer(sk->sk_dst_cache))
- sk_tx_queue_set(sk, queue_index);
+ sk_tx_queue_set(sk, new_index);
queue_index = new_index;
}