linux-kernel - Re: [PATCH net-next] bnxt_en: Allow to set switchdev mode without existing VFs

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Message-ID: <78dbf8d2-c13d-a921-bd73-a1361753cb66@redhat.com>
Date:   Tue, 11 Apr 2023 07:40:11 +0200
From:   Ivan Vecera <ivecera@...hat.com>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     netdev@...r.kernel.org, mschmidt@...hat.com,
        Michael Chan <michael.chan@...adcom.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] bnxt_en: Allow to set switchdev mode without
 existing VFs

On 09. 04. 23 11:02, Leon Romanovsky wrote:
> On Thu, Apr 06, 2023 at 03:04:55PM +0200, Ivan Vecera wrote:
>> Remove an inability of bnxt_en driver to set eswitch to switchdev
>> mode without existing VFs by:
>>
>> 1. Allow to set switchdev mode in bnxt_dl_eswitch_mode_set() so
>>     representors are created only when num_vfs > 0 otherwise just
>>     set bp->eswitch_mode
>> 2. Do not automatically change bp->eswitch_mode during
>>     bnxt_vf_reps_create() and bnxt_vf_reps_destroy() calls so
>>     the eswitch mode is managed only by an user by devlink.
>>     Just set temporarily bp->eswitch_mode to legacy to avoid
>>     re-opening of representors during destroy.
>> 3. Create representors in bnxt_sriov_enable() if current eswitch
>>     mode is switchdev one
>>
>> Tested by this sequence:
>> 1. Set PF interface up
>> 2. Set PF's eswitch mode to switchdev
>> 3. Created N VFs
>> 4. Checked that N representors were created
>> 5. Set eswitch mode to legacy
>> 6. Checked that representors were deleted
>> 7. Set eswitch mode back to switchdev
>> 8. Checked that representros were re-created
> 
> Why do you think that this last item is the right behavior?
> IMHO all configurations which were done after you switched mode
> should be cleared and not recreated while toggling.

No, I mean that if I switch back to switchdev mode then representors
should be created again for existing virtual functions not that
representors should be restored with their existing state...
So the point 8 should say:
"8. Checked that representors exist again for VFs"

Ivan