linux-kernel - Re: [PATCH net-next v2 1/6] net: dcb: add new pcp selector to app object

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Date:   Fri, 30 Sep 2022 17:41:22 +0200
From:   Petr Machata <petrm@...dia.com>
To:     Petr Machata <petrm@...dia.com>
CC:     Daniel Machon <daniel.machon@...rochip.com>,
        <netdev@...r.kernel.org>, <davem@...emloft.net>,
        <maxime.chevallier@...tlin.com>, <thomas.petazzoni@...tlin.com>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <lars.povlsen@...rochip.com>, <Steen.Hegelund@...rochip.com>,
        <UNGLinuxDriver@...rochip.com>, <joe@...ches.com>,
        <linux@...linux.org.uk>, <horatiu.vultur@...rochip.com>,
        <Julia.Lawall@...ia.fr>, <vladimir.oltean@....com>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH net-next v2 1/6] net: dcb: add new pcp selector to app
 object


Petr Machata <petrm@...dia.com> writes:

> We can pack the new stuff into a smaller payload. The inner attribute
> would not be DCB_ATTR_DCB_APP, but say DCB_ATTR_DCB_PCP, which would
> imply the selector. The payload can be struct { u8 prio; u16 proto; }.
> This would have been bounced by the old UAPI, so we know no userspace
> makes use of that.

Except this will end up having size of 4 anyway due to alignment. We'll
have to make it a struct { ... } __attribute__((__packed__));