------- Comment From cls...@us.ibm.com 2018-10-23 19:47 EDT-------
(In reply to comment #8)
> I built a test kernel with commit 37fdffb217a45609edccbb8b407d031143f551c0.
> The test kernel can be downloaded from:
> http://kernel.ubuntu.com/~jsalisbury/lp1799393
>
> Can you test this kernel and see if it resolves this bug?
>
> Note about installing test kernels:
> ? If the test kernel is prior to 4.15(Bionic) you need to install the
> linux-image and linux-image-extra .deb packages.
> ? If the test kernel is 4.15(Bionic) or newer, you need to install the
> linux-modules, linux-modules-extra and linux-image-unsigned .deb packages.
>
> Thanks in advance!

Hi
I was able to verify this with this kernel
4.18.0-10-generic #12~lp1799393 SMP Tue Oct 23 19:04:13 UTC 2018 ppc64le 
ppc64le ppc64le GNU/Linux

I did a ping flood and I can see that I am not getting wqe_err right way like 
before.
#netstat -in
Kernel Interface table
Iface      MTU    RX-OK RX-ERR RX-DRP RX-OVR    TX-OK TX-ERR TX-DRP TX-OVR Flg
enP2p1s0  1500     4295      0      9 0           271      0      0      0 BMRU
enp1s0f0  1500  5608322      0      0 0       5606566      0      0      0 BMRU
lo       65536       12      0      0 0            12      0      0      0 LRU
virbr0    1500        0      0      0 0             0      0      0      0 BMU
# ethtool -S enp1s0f0 | grep rx_wqe_err
rx_wqe_err: 0

Thanks.

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https://bugs.launchpad.net/bugs/1799393

Title:
  Mellanox CX5 stops pinging with rx_wqe_err (mlx5_core)

Status in The Ubuntu-power-systems project:
  In Progress
Status in linux package in Ubuntu:
  In Progress

Bug description:
  == Comment: #0 - Michael Ranweiler  - 2018-10-18 11:34:40 ==

  
  ---Problem Description---
  At the system if u do 
  ethtool -S enP48p1s0f0 | grep wqe_err
       rx_wqe_err: 1
       rx0_wqe_err: 0
       rx1_wqe_err: 0
       rx2_wqe_err: 0
       rx3_wqe_err: 1
       rx4_wqe_err: 0
       rx5_wqe_err: 0
       rx6_wqe_err: 0
       rx7_wqe_err: 0
       rx8_wqe_err: 0
       rx9_wqe_err: 0
       rx10_wqe_err: 0
       rx11_wqe_err: 0
       rx12_wqe_err: 0
       rx13_wqe_err: 0
       rx14_wqe_err: 0
       rx15_wqe_err: 0

  Will see that rx side is hitting issue. 
   
   
  ---Additional Hardware Info---
  Mellanox CX5 Ethernet 100G
  lspci
  0030:01:00.0 Ethernet controller: Mellanox Technologies MT28800 Family 
[ConnectX-5 Ex]
  0030:01:00.1 Ethernet controller: Mellanox Technologies MT28800 Family 
[ConnectX-5 Ex]
   
   
  Machine Type = P9 
   
  ---Debugger---
  A debugger is not configured
   
  ---Steps to Reproduce---
  Using a CX5 Ethernet 100G card 
  lspci
  0030:01:00.0 Ethernet controller: Mellanox Technologies MT28800 Family 
[ConnectX-5 Ex]
  0030:01:00.1 Ethernet controller: Mellanox Technologies MT28800 Family 
[ConnectX-5 Ex]

  just configure IP 
  ifconfig enP48p1s0f0 33.33.33.33 netmask 255.255.255.0 up
  then partner system configure IP and then try ping -f
  ping -f 33.33.33.33
  PING 33.33.33.33 (33.33.33.33) 56(84) bytes of data.
  ........................................^C
  --- 33.33.33.33 ping statistics ---
  5413 packets transmitted, 5373 received, 0% packet loss, time 934ms
  rtt min/avg/max/mdev = 0.015/0.019/0.669/0.010 ms, ipg/ewma 0.172/0.020 ms
  # ping 33.33.33.33
  PING 33.33.33.33 (33.33.33.33) 56(84) bytes of data.
  ^C
  --- 33.33.33.33 ping statistics ---
  2 packets transmitted, 0 received, 100% packet loss, time 1071ms

  then at the recv system then do 
  ethtool -S enP48p1s0f0 | grep wqe_err
       rx_wqe_err: 1
       rx0_wqe_err: 0
       rx1_wqe_err: 0
       rx2_wqe_err: 0
       rx3_wqe_err: 1
       rx4_wqe_err: 0
       rx5_wqe_err: 0
       rx6_wqe_err: 0
       rx7_wqe_err: 0
       rx8_wqe_err: 0
       rx9_wqe_err: 0
       rx10_wqe_err: 0
       rx11_wqe_err: 0
       rx12_wqe_err: 0
       rx13_wqe_err: 0
       rx14_wqe_err: 0
       rx15_wqe_err: 0
  you will see rx_wqe_err with a counter non-zero. 

  This is fixed by this patch:
  
https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=37fdffb217a45609edccbb8b407d031143f551c0

  == Comment: #1 - Carol L. Soto  - 2018-10-18 11:46:00 ==
  I did a git clone to the cosmic tree and loaded the kernel in a system. 

  kernel 4.18.12 and I can recreate it.

  lspci | grep Mell | grep ConnectX-5
  0000:01:00.0 Ethernet controller: Mellanox Technologies MT28800 Family 
[ConnectX-5 Ex]
  0000:01:00.1 Ethernet controller: Mellanox Technologies MT28800 Family 
[ConnectX-5 Ex]
  0030:01:00.0 Infiniband controller: Mellanox Technologies MT28800 Family 
[ConnectX-5 Ex]
  0030:01:00.1 Infiniband controller: Mellanox Technologies MT28800 Family 
[ConnectX-5 Ex]
  :~# ethtool -S enp1s0f0 | grep wqe_err
       rx_wqe_err: 2
       rx0_wqe_err: 1
       rx1_wqe_err: 1
       rx2_wqe_err: 0
       rx3_wqe_err: 0
       rx4_wqe_err: 0
       rx5_wqe_err: 0
       rx6_wqe_err: 0
       rx7_wqe_err: 0
       rx8_wqe_err: 0
       rx9_wqe_err: 0
       rx10_wqe_err: 0
  ...

  
  Let me check if the proposed patch needs backport or not.

  == Comment: #3 - Carol L. Soto  - 2018-10-18 13:34:46 ==
  I was able to apply the proposed patch as it  to the cosmic git tree and no 
issue. (no need to backport) 
  using a kernel 4.18.12+. 

  With the proposed patch I do not see wqe err and ping does not stop. 
  ethtool -S enp1s0f0 | grep wqe_err
       rx_wqe_err: 0
       rx0_wqe_err: 0
       rx1_wqe_err: 0
       rx2_wqe_err: 0
       rx3_wqe_err: 0
       rx4_wqe_err: 0
       rx5_wqe_err: 0
       rx6_wqe_err: 0
       rx7_wqe_err: 0
       rx8_wqe_err: 0
       rx9_wqe_err: 0
       rx10_wqe_err: 0
  ...

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