netdev - Re: [PATCH ethtool] ethtool: Support for configurable RSS hash function

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Date:   Sat, 25 Mar 2017 14:50:47 -0700
From:   Jakub Kicinski <kubakici@...pl>
To:     "John W. Linville" <linville@...driver.com>
Cc:     Gal Pressman <galp@...lanox.com>, netdev@...r.kernel.org,
        Eyal Perry <eyalpe@...lanox.com>
Subject: Re: [PATCH ethtool] ethtool: Support for configurable RSS hash
 function

On Wed,  8 Mar 2017 16:03:51 +0200, Gal Pressman wrote:
> This ethtool patch adds support to set and get the current RSS hash
> function for the device through the new hfunc mask field in the
> ethtool_rxfh struct. Kernel supported hash function names are queried
> with ETHTOOL_GSTRINGS - each string is corresponding with a bit in hfunc
> mask according to its index in the string-set.
> 
> Signed-off-by: Eyal Perry <eyalpe@...lanox.com>
> Signed-off-by: Gal Pressman <galp@...lanox.com>
> Reviewed-by: Saeed Mahameed <saeedm@...lanox.com>

Hi John,

It seems you have applied both my earlier patch with get support and
this:

adbaa18b9bc1 ("ethtool: Support for configurable RSS hash function")
b932835d2302 ("ethtool: print hash function with ethtool -x|--show-rxfh-indir")

Now we print the RSS function twice:

RX flow hash indirection table for em4 with 4 RX ring(s):
    0:      [...]
RSS hash function: toeplitz  <--- from my adbaa18b9bc1
RSS hash key:
Operation not supported
RSS hash function:           <--- from this patch
    toeplitz: on
    xor: off
    crc32: off

Reverting my patch is probably the easiest way forward, although I find
it more concise and easier to parse in test scripts :)