[dpdk-dev] [PATCH 1/3] drivers/net: fix RSS hash offload set if Rx mode is RSS only

[Andrew Rybchenko]

On 11/15/19 7:35 PM, Stephen Hemminger wrote:
> On Fri, 15 Nov 2019 12:41:16 +0300
> Andrew Rybchenko <arybchenko at solarflare.com> wrote:
>
>> Hi Stephen,
>>
>> On 11/14/19 7:56 PM, Stephen Hemminger wrote:
>>> On Thu, 14 Nov 2019 16:40:50 +0000
>>> Andrew Rybchenko <arybchenko at solarflare.com> wrote:
>>>    
>>>> By default RSS hash delivery (offload) is bound to RSS mode and
>>>> it is incorrect to advertise it as enabled if Rx multi-queue mode
>>>> has no RSS.
>>>>
>>>> Fixes: 8b945a7f7dcb ("drivers/net: update Rx RSS hash offload capabilities")
>>>>
>>>> Signed-off-by: Andrew Rybchenko <arybchenko at solarflare.com>
>>> If you have to change so many drivers, why not just handle it in
>>> common rte_ethdev code?
>> rte_ethdev cannot set the offload itself since it has no knowledge that
>> the offload cannot be disabled.
>> rte_ethdev can blacklist the automatically set offloads in the case of
>> non-RSS Rx multi-queue mode, but I don't like it since it adds to many
>> layers where we change offloads.
>> That's why I prefer this way.
>>
>> Andrew.
> Makes sense, just concerned that other (or new) drivers will
> have same issue.

Yes, that's true, we should try to find a better solution, but I don't
see any better solution right now. I'll keep it in my head.