This is a note to let you know that I've just added the patch titled
tcp: xps: fix reordering issues
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tcp-xps-fix-reordering-issues.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From eb473853522f6481d2c933109be2f8236fa8913d Mon Sep 17 00:00:00 2001
From: Eric Dumazet <edumazet@xxxxxxxxxx>
Date: Thu, 23 May 2013 07:44:20 +0000
Subject: tcp: xps: fix reordering issues
From: Eric Dumazet <edumazet@xxxxxxxxxx>
[ Upstream commit 547669d483e5783d722772af1483fa474da7caf9 ]
commit 3853b5841c01a ("xps: Improvements in TX queue selection")
introduced ooo_okay flag, but the condition to set it is slightly wrong.
In our traces, we have seen ACK packets being received out of order,
and RST packets sent in response.
We should test if we have any packets still in host queue.
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Cc: Tom Herbert <therbert@xxxxxxxxxx>
Cc: Yuchung Cheng <ycheng@xxxxxxxxxx>
Cc: Neal Cardwell <ncardwell@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ipv4/tcp_output.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -835,11 +835,13 @@ static int tcp_transmit_skb(struct sock
&md5);
tcp_header_size = tcp_options_size + sizeof(struct tcphdr);
- if (tcp_packets_in_flight(tp) == 0) {
+ if (tcp_packets_in_flight(tp) == 0)
tcp_ca_event(sk, CA_EVENT_TX_START);
- skb->ooo_okay = 1;
- } else
- skb->ooo_okay = 0;
+
+ /* if no packet is in qdisc/device queue, then allow XPS to select
+ * another queue.
+ */
+ skb->ooo_okay = sk_wmem_alloc_get(sk) == 0;
skb_push(skb, tcp_header_size);
skb_reset_transport_header(skb);
Patches currently in stable-queue which might be from edumazet@xxxxxxxxxx are
queue-3.4/ipv6-fix-possible-crashes-in-ip6_cork_release.patch
queue-3.4/tcp-xps-fix-reordering-issues.patch
queue-3.4/ip_tunnel-fix-kernel-panic-with-icmp_dest_unreach.patch
queue-3.4/tcp-fix-tcp_md5_hash_skb_data.patch
queue-3.4/net-force-a-reload-of-first-item-in-hlist_nulls_for_each_entry_rcu.patch
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