netdev - Re: Kernel 4.19 network performance - forwarding/routing normal users traffic

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Date:   Thu, 8 Nov 2018 17:42:23 -0700
From:   David Ahern <dsahern@...il.com>
To:     Paweł Staszewski <pstaszewski@...are.pl>,
        Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     netdev <netdev@...r.kernel.org>, Yoel Caspersen <yoel@...knet.dk>
Subject: Re: Kernel 4.19 network performance - forwarding/routing normal users
 traffic

On 11/8/18 5:40 PM, Paweł Staszewski wrote:
> 
> 
> W dniu 08.11.2018 o 17:32, David Ahern pisze:
>> On 11/8/18 9:27 AM, Paweł Staszewski wrote:
>>>>> What hardware is this?
>>>>>
>>> mellanox connectx 4
>>> ethtool -i enp175s0f0
>>> driver: mlx5_core
>>> version: 5.0-0
>>> firmware-version: 12.21.1000 (SM_2001000001033)
>>> expansion-rom-version:
>>> bus-info: 0000:af:00.0
>>> supports-statistics: yes
>>> supports-test: yes
>>> supports-eeprom-access: no
>>> supports-register-dump: no
>>> supports-priv-flags: yes
>>>
>>> ethtool -i enp175s0f1
>>> driver: mlx5_core
>>> version: 5.0-0
>>> firmware-version: 12.21.1000 (SM_2001000001033)
>>> expansion-rom-version:
>>> bus-info: 0000:af:00.1
>>> supports-statistics: yes
>>> supports-test: yes
>>> supports-eeprom-access: no
>>> supports-register-dump: no
>>> supports-priv-flags: yes
>>>
>>>>> Start with:
>>>>>
>>>>> echo 1 > /sys/kernel/debug/tracing/events/xdp/enable
>>>>> cat /sys/kernel/debug/tracing/trace_pipe
>>>>   cat /sys/kernel/debug/tracing/trace_pipe
>>>>           <idle>-0     [045] ..s. 68469.467752: xdp_devmap_xmit:
>>>> ndo_xdp_xmit map_id=32 map_index=5 action=REDIRECT sent=0 drops=1
>>>> from_ifindex=4 to_ifindex=5 err=-6
>> FIB lookup is good, the redirect is happening, but the mlx5 driver does
>> not like it.
>>
>> I think the -6 is coming from the mlx5 driver and the packet is getting
>> dropped. Perhaps this check in mlx5e_xdp_xmit:
>>
>>         if (unlikely(sq_num >= priv->channels.num))
>>                  return -ENXIO;
> I removed that part and recompiled - but after running now xdp_fwd i
> have kernel pamic :)

Jesper or one of the Mellanox folks needs to respond about the config
needed to run XDP with this NIC. I don't have a 40G or 100G card to play
with.