netdev - Re: [Patch net v2] mlx5: fixup checksum for short ethernet frame padding

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Date:   Thu, 13 Dec 2018 09:40:10 +0100
From:   Nikola Ciprich <nikola.ciprich@...uxbox.cz>
To:     Saeed Mahameed <saeedm@...lanox.com>
Cc:     "saeedm@....mellanox.co.il" <saeedm@....mellanox.co.il>,
        "xiyou.wangcong@...il.com" <xiyou.wangcong@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        Nikola Ciprich <nikola.ciprich@...uxbox.cz>
Subject: Re: [Patch net v2] mlx5: fixup checksum for short ethernet frame
 padding

Hi Saeed,

> for now i feel that you don't want csum complete in your servers and we
> already have the tool for that, just do:
> 
> ethtool --set-priv-flags <ifname> rx_no_csum_complete on
> ethtool --show-priv-flags <ifname>
> Private flags for p5p1:
> rx_cqe_moder       : on
> tx_cqe_moder       : off
> rx_cqe_compress    : off
> rx_striding_rq     : off
> rx_no_csum_complete: on
> 
> this will disable csum complete and avoid the csum error for padded
> short packets.

we're experiencing the same issue with 4.19 and I'd like to hotfix
it now before the issue is fixed in the kernel.. however I don't see
the flags in ethtool (even with latest 4.19 version..)

I'm using following cards:

d8:00.0 Ethernet controller: Mellanox Technologies MT27710 Family [ConnectX-4 Lx]

Am i doing something wrong, or is this different issue?

thanks a lot in advance

BR

nik







> 
> 
> Thanks,
> Saeed.
> 

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