linux-kernel - Re: [PATCH 1/1] can: skb: add and set local

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Message-ID: <20220511130540.yowjdvzftq2jutiw@pengutronix.de>
Date:   Wed, 11 May 2022 15:05:40 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Oliver Hartkopp <socketcan@...tkopp.net>
Cc:     Oleksij Rempel <o.rempel@...gutronix.de>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        Devid Antonio Filoni <devid.filoni@...uetechnologies.com>,
        kernel@...gutronix.de, linux-can@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        David Jander <david@...tonic.nl>
Subject: Re: [PATCH 1/1] can: skb: add and set local_origin flag

On 11.05.2022 14:38:32, Oliver Hartkopp wrote:
> I'm a bit unsure why we should not stick with the simple skb->sk
> handling?

Another use where skb->sk breaks is sending CAN frames with SO_TXTIME
with the sched_etf.

I have a patched version of cangen that uses SO_TXTIME. It attaches a
time to transmit to a CAN frame when sending it. If you send 10 frames,
each 100ms after the other and then exit the program, the first CAN
frames show up as TX'ed while the others (after closing the socket) show
up as RX'ed CAN frames in candump.

regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
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