** Changed in: linux (Ubuntu Vivid)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1409123
Title:
"hw csum failure" in encapsulated network topolgies
Status in linux package in Ubuntu:
Fix Released
Status in linux-lts-trusty package in Ubuntu:
Invalid
Status in linux-lts-utopic package in Ubuntu:
Invalid
Status in linux source package in Precise:
Confirmed
Status in linux-lts-trusty source package in Precise:
Confirmed
Status in linux-lts-utopic source package in Precise:
Invalid
Status in linux source package in Trusty:
Confirmed
Status in linux-lts-trusty source package in Trusty:
Invalid
Status in linux-lts-utopic source package in Trusty:
Confirmed
Status in linux source package in Utopic:
Confirmed
Status in linux-lts-trusty source package in Utopic:
Invalid
Status in linux-lts-utopic source package in Utopic:
Invalid
Status in linux source package in Vivid:
Fix Released
Status in linux-lts-trusty source package in Vivid:
Invalid
Status in linux-lts-utopic source package in Vivid:
Invalid
Bug description:
Virtualized network topologies that utilize encapsulation (e.g.,
VXLAN) and bridging may experience kernel errors of the format:
[ 4297.761899] eth0: hw csum failure
[ 4297.765210] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G OE
3.18.0-rc4
-nn+ #22
[ 4297.765212] Hardware name: LENOVO 0829F3U/To be filled by O.E.M., BIOS
90KT15
AUS 07/21/2010
[ 4297.765216] 0000000000000000 ffff88013fc03ba8 ffffffff8172f026
0000000000000
001
[ 4297.765219] ffff88013870e000 ffff88013fc03bc8 ffffffff8162ba52
ffffffff8161c
1a0
[ 4297.765221] ffff8800afdf1000 ffff88013fc03c08 ffffffff8162325c
ffff88013870e
000
[ 4297.765223] Call Trace:
[ 4297.765224] <IRQ> [<ffffffff8172f026>] dump_stack+0x46/0x58
[ 4297.765235] [<ffffffff8162ba52>] netdev_rx_csum_fault+0x42/0x50
[ 4297.765238] [<ffffffff8161c1a0>] ? skb_push+0x40/0x40
[ 4297.765240] [<ffffffff8162325c>] __skb_checksum_complete+0xbc/0xd0
[ 4297.765243] [<ffffffff8168c602>] tcp_v4_rcv+0x2e2/0x950
[ 4297.765246] [<ffffffff81666ca0>] ? ip_rcv_finish+0x360/0x360
[ 4297.765248] [<ffffffff81660224>] ? nf_hook_slow+0x74/0x130
[ 4297.765250] [<ffffffff81666ca0>] ? ip_rcv_finish+0x360/0x360
[ 4297.765253] [<ffffffff81666d4c>] ip_local_deliver_finish+0xac/0x220
[ 4297.765255] [<ffffffff81667058>] ip_local_deliver+0x48/0x80
[ 4297.765257] [<ffffffff816669c1>] ip_rcv_finish+0x81/0x360
[ 4297.765259] [<ffffffff81667332>] ip_rcv+0x2a2/0x3f0
[ 4297.765261] [<ffffffff8162e932>] __netif_receive_skb_core+0x562/0x7a0
[ 4297.765263] [<ffffffff8162eb88>] __netif_receive_skb+0x18/0x60
[ 4297.765265] [<ffffffff8162f8f6>] process_backlog+0xa6/0x150
The backtrace may vary, stacks descending into conntrack have also
been observed:
Call Trace:
<IRQ> [<ffffffff8171a324>] dump_stack+0x45/0x56
[<ffffffff8161bfba>] netdev_rx_csum_fault+0x3a/0x40
[<ffffffff81614782>] __skb_checksum_complete_head+0x62/0x70
[<ffffffff816147a1>] __skb_checksum_complete+0x11/0x20
[<ffffffff816a3eac>] nf_ip_checksum+0xcc/0x100
[<ffffffffa04df33b>] udp_error+0xdb/0x1f0 [nf_conntrack]
[<ffffffffa04d926e>] nf_conntrack_in+0xee/0xb40 [nf_conntrack]
[<ffffffffa0307653>] ? do_execute_actions+0x2e3/0xab0 [openvswitch]
[<ffffffffa0307e4b>] ? ovs_execute_actions+0x2b/0x30 [openvswitch]
[<ffffffff81654540>] ? inet_del_offload+0x40/0x40
[<ffffffffa03b52e2>] ipv4_conntrack_in+0x22/0x30 [nf_conntrack_ipv4]
[<ffffffff8164e0aa>] nf_iterate+0x9a/0xb0
[<ffffffff81654540>] ? inet_del_offload+0x40/0x40
[<ffffffff8164e134>] nf_hook_slow+0x74/0x130
[<ffffffff81654540>] ? inet_del_offload+0x40/0x40
[<ffffffff81654f68>] ip_rcv+0x2f8/0x3d0
The root cause of this is twofold:
First, the kernel handling of forwarded packets that have been
encapsulated (e.g., from VXLAN) for devices that support
CHECKSUM_COMPLETE checksum offload fails to update the running
checksum when decapsulating the packet.
Second, for the enic device itself, the hardware is not correctly
computing the checksum for some cases.
Both of these issues are patched in mainline:
commit 17e96834fd35997ca7cdfbf15413bcd5a36ad448
Author: Govindarajulu Varadarajan <_gov...@gmx.com>
Date: Thu Dec 18 15:58:42 2014 +0530
enic: fix rx skb checksum
commit 2c26d34bbcc0b3f30385d5587aa232289e2eed8e
Author: Jay Vosburgh <jay.vosbu...@canonical.com>
Date: Fri Dec 19 15:32:00 2014 -0800
net/core: Handle csum for CHECKSUM_COMPLETE VXLAN forwarding
===
break-fix: - 17e96834fd35997ca7cdfbf15413bcd5a36ad448
break-fix: - 2c26d34bbcc0b3f30385d5587aa232289e2eed8e
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