From: Petr Machata <petrm@nvidia.com>
To: Petr Machata <petrm@nvidia.com>
Cc: Jakub Kicinski <kuba@kernel.org>,
Daniel Machon <daniel.machon@microchip.com>,
<netdev@vger.kernel.org>, <davem@davemloft.net>,
<maxime.chevallier@bootlin.com>, <thomas.petazzoni@bootlin.com>,
<edumazet@google.com>, <pabeni@redhat.com>,
<lars.povlsen@microchip.com>, <Steen.Hegelund@microchip.com>,
<UNGLinuxDriver@microchip.com>, <joe@perches.com>,
<linux@armlinux.org.uk>, <horatiu.vultur@microchip.com>,
<Julia.Lawall@inria.fr>, <vladimir.oltean@nxp.com>,
<linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH net-next v2 1/6] net: dcb: add new pcp selector to app object
Date: Tue, 4 Oct 2022 12:52:35 +0200 [thread overview]
Message-ID: <87v8ozx3hb.fsf@nvidia.com> (raw)
In-Reply-To: <87zgebx3zb.fsf@nvidia.com>
Petr Machata <petrm@nvidia.com> writes:
> Jakub Kicinski <kuba@kernel.org> writes:
>
>> On Mon, 3 Oct 2022 09:52:59 +0200 Petr Machata wrote:
>>> I assumed the policy is much more strict with changes like this. If you
>>> think it's OK, I'm fine with it as well.
>>>
>>> The userspace (lldpad in particular) is doing the opposite thing BTW:
>>> assuming everything in the nest is a DCB_ATTR_IEEE_APP. When we start
>>> emitting the new attribute, it will get confused.
>>
>> Can you add an attribute or a flag to the request which would turn
>> emitting the new attrs on?
>
> The question is whether it's better to do it anyway. My opinion is that
> if a userspace decides to make assumptions about the contents of a TLV,
> and neglects to validate the actual TLV type, it's on them, and I'm not
> obligated to keep them working. We know about this case, but really any
> attribute addition at all could potentially trip some userspace if they
> expected something else at this offset.
And re the flag: I think struct dcbmsg.dcb_pad was meant to be the place
to keep flags when the need arises, but it is not validated anywhere, so
we cannot use it. It could be a new command, but I'm not a fan. So if we
need to discriminate userspaces, I think it should be a new attribute.
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next prev parent reply other threads:[~2022-10-04 10:57 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-29 18:52 [PATCH net-next v2 0/6] Add new PCP and APPTRUST attributes to dcbnl Daniel Machon
2022-09-29 18:52 ` [PATCH net-next v2 1/6] net: dcb: add new pcp selector to app object Daniel Machon
2022-09-30 12:20 ` Petr Machata
2022-09-30 15:41 ` Petr Machata
2022-10-01 0:54 ` Jakub Kicinski
2022-10-03 7:52 ` Petr Machata
2022-10-03 16:25 ` Jakub Kicinski
2022-10-03 21:59 ` Daniel.Machon
2022-10-03 23:34 ` Jakub Kicinski
2022-10-04 10:56 ` Petr Machata
2022-10-04 10:20 ` Petr Machata
2022-10-04 10:52 ` Petr Machata [this message]
2022-10-04 19:51 ` Jakub Kicinski
2022-10-03 6:48 ` Daniel.Machon
2022-10-03 8:22 ` Petr Machata
2022-10-03 9:33 ` Daniel.Machon
2022-10-05 10:09 ` Petr Machata
2022-09-29 18:52 ` [PATCH net-next v2 2/6] net: dcb: add new apptrust attribute Daniel Machon
2022-09-30 13:03 ` Petr Machata
2022-09-29 18:52 ` [PATCH net-next v2 3/6] net: microchip: sparx5: add support for offloading pcp table Daniel Machon
2022-09-29 18:52 ` [PATCH net-next v2 4/6] net: microchip: sparx5: add support for apptrust Daniel Machon
2022-09-30 15:49 ` Petr Machata
2022-10-03 6:52 ` Daniel.Machon
2022-10-03 8:01 ` Petr Machata
2022-10-03 8:17 ` Daniel.Machon
2022-10-03 9:34 ` Petr Machata
2022-09-29 18:52 ` [PATCH net-next v2 5/6] net: microchip: sparx5: add support for offloading dscp table Daniel Machon
2022-09-29 18:52 ` [PATCH net-next v2 6/6] net: microchip: sparx5: add support for offloading default prio Daniel Machon
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