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[Talat Batheesh <1544978@xxxxxxxxxxxxxxxxxx>]

Hi,
This upstream commit should fix the bug 

commit 82d69203df634b4dfa765c94f60ce9482bcc44d6
Author: Daniel Jurgens <danielj@xxxxxxxxxxxx>
Date:   Wed May 4 15:00:33 2016 +0300

    net/mlx4_en: Fix endianness bug in IPV6 csum calculation

    Use htons instead of unconditionally byte swapping nexthdr.  On a little
    endian systems shifting the byte is correct behavior, but it results in
    incorrect csums on big endian architectures.

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https://bugs.launchpad.net/bugs/1544978

Title:
  PCI Call Traces  hw csum failure in dmesg with  4.4.0-2-generic

Status in Ubuntu on IBM z Systems:
  Incomplete
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  == Comment: #0 - Helmut Grauer <helmut.grauer@xxxxxxxxxx> - 2016-02-12 03:00:03 ==
  Hi
   getting the following Call Traces when PCI interfaces will be configured
  [  246.051566] enp0s0: hw csum failure
  [  246.051571] CPU: 2 PID: 0 Comm: swapper/2 Tainted: G            E   4.4.0-2-generic #16-Ubuntu
  [  246.051573]        00000000f9793778 00000000f9793808 0000000000000002 0000000000000000
                        00000000f97938a8 00000000f9793820 00000000f9793820 0000000000114182
                        0000000000000166 000000000091e9ca 000000000000000a 000000000000000a
                        00000000f9793868 00000000f9793808 0000000000000000 00000000f9d38000
                        0000000000000000 0000000000114182 00000000f9793808 00000000f9793868
  [  246.051581] Call Trace:
  [  246.051589] ([<00000000001140b8>] show_trace+0x140/0x148)
  [  246.051590]  [<0000000000114136>] show_stack+0x76/0xe8
  [  246.051595]  [<00000000005172d6>] dump_stack+0x6e/0x90
  [  246.051599]  [<0000000000673500>] __skb_checksum_complete+0xd0/0xd8
  [  246.051605]  [<000000000076ae24>] icmpv6_rcv+0x124/0x500
  [  246.051608]  [<0000000000746e60>] ip6_input_finish+0x170/0x4e0
  [  246.051610]  [<000000000074775c>] ip6_input+0x4c/0xd0
  [  246.051611]  [<00000000007478ee>] ip6_mc_input+0x10e/0x280
  [  246.051612]  [<0000000000747538>] ipv6_rcv+0x368/0x540
  [  246.051616]  [<000000000067e5d4>] __netif_receive_skb_core+0x6fc/0xaf8
  [  246.051618]  [<0000000000681a56>] netif_receive_skb_internal+0x3e/0xd8
  [  246.051619]  [<0000000000682314>] napi_gro_frags+0x17c/0x208
  [  246.051627]  [<000003ff805f3a2c>] mlx4_en_process_rx_cq+0x8b4/0xbd0 [mlx4_en]
  [  246.051630]  [<000003ff805f3e62>] mlx4_en_poll_rx_cq+0xc2/0x1a0 [mlx4_en]
  [  246.051631]  [<00000000006839e2>] net_rx_action+0x2a2/0x418
  [  246.051635]  [<0000000000162726>] __do_softirq+0x156/0x300
  [  246.051637]  [<0000000000162ace>] irq_exit+0xd6/0xf8
  [  246.051641]  [<000000000010cc5a>] do_IRQ+0x6a/0x88
  [  246.051644]  [<00000000007a99c2>] io_int_handler+0x112/0x220
  [  246.051646]  [<0000000000104856>] enabled_wait+0x56/0xa8
  [  246.051649] ([<0000000000ccb888>] cpu_dead_idle+0x0/0x8)
  [  246.051651]  [<0000000000104b5a>] arch_cpu_idle+0x32/0x48
  [  246.051669]  [<00000000001a8198>] cpu_startup_entry+0x200/0x278
  [  246.051674]  [<00000000001156ba>] smp_start_secondary+0xea/0xf8
  [  246.051679]  [<00000000007a9f42>] restart_int_handler+0x62/0x78
  [  246.051680]  [<0000000000000000>]           (null)

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