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[Andy Whitcroft <apw@xxxxxxxxxxxxx>]

These seems to be making their way to -stable as expected, expecting
these to hit the relevant upstreams in time for the next SRU cycle.

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https://bugs.launchpad.net/bugs/1409123

Title:
  "hw csum failure" in encapsulated network topolgies

Status in linux package in Ubuntu:
  Confirmed
Status in linux-lts-utopic package in Ubuntu:
  Invalid
Status in linux source package in Trusty:
  Confirmed
Status in linux-lts-utopic source package in Trusty:
  Confirmed
Status in linux source package in Utopic:
  Confirmed
Status in linux-lts-utopic source package in Utopic:
  Invalid
Status in linux source package in Vivid:
  Confirmed
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 <_govind@xxxxxxx>
  Date: Thu Dec 18 15:58:42 2014 +0530

  enic: fix rx skb checksum

  commit 2c26d34bbcc0b3f30385d5587aa232289e2eed8e
  Author: Jay Vosburgh <jay.vosburgh@xxxxxxxxxxxxx>
  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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