netdev - Re: [net 7/8] net/mlx5e: Fix update of hash function/key via ethtool

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Date:   Sat, 28 Jan 2017 13:06:31 +0200
From:   Saeed Mahameed <saeedm@....mellanox.co.il>
To:     Tom Herbert <tom@...bertland.com>
Cc:     Saeed Mahameed <saeedm@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Gal Pressman <galp@...lanox.com>
Subject: Re: [net 7/8] net/mlx5e: Fix update of hash function/key via ethtool

On Fri, Jan 27, 2017 at 11:50 PM, Tom Herbert <tom@...bertland.com> wrote:
> On Fri, Jan 27, 2017 at 12:38 PM, Saeed Mahameed <saeedm@...lanox.com> wrote:
>> From: Gal Pressman <galp@...lanox.com>
>>
>> Modifying TIR hash should change selected fields bitmask in addition to
>> the function and key.
>> Formerly, we would not set this field resulting in zeroing of its value,
>> which means no packet fields are used for RX RSS hash calculation thus
>> causing all traffic to arrive in RQ[0].
>>
> This commit log is rather scant in details. Does this mean that RSS is
> somehow broken in mlx5? What is exact test that demonstrates bad
> behavior? Did you verify that this doesn't break IPv4 or IPv6?
>

before this fix out of the box RSS worked fine for both IPv4/IPv6, the
only broken flow is when the user explicitly uses ethtoo -X to update
the RSS indirection table or hash function.

We did verify both IPv6 and IPv4 RSS worked fine after the user
changes RSS configuration via ethtool -X