Public bug reported:
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
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Jay Vosburgh (jvosburgh)
Status: New
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Jay Vosburgh (jvosburgh)
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https://bugs.launchpad.net/bugs/1409123
Title:
"hw csum failure" in encapsulated network topolgies
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