netdev - Re: [PATCH RESEND 0/2] j1939: make sure that sent DAT/CTL frames are marked as TX

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Date:   Tue, 10 May 2022 06:34:06 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Devid Antonio Filoni <devid.filoni@...uetechnologies.com>
Cc:     Robin van der Gracht <robin@...tonic.nl>, kernel@...gutronix.de,
        linux-can@...r.kernel.org, Oleksij Rempel <linux@...pel-privat.de>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Jayat <maxime.jayat@...ile-devices.fr>,
        kbuild test robot <lkp@...el.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND 0/2] j1939: make sure that sent DAT/CTL frames are
 marked as TX

Hi Devid,

On Mon, May 09, 2022 at 07:07:44PM +0200, Devid Antonio Filoni wrote:
> Hello,
> 
> If candump -x is used to dump CAN bus traffic on an interface while a J1939
> socket is sending multi-packet messages, then the DAT and CTL frames
> show up as RX instead of TX.
> 
> This patch series sets to generated struct sk_buff the owning struct sock
> pointer so that the MSG_DONTROUTE flag can be set by recv functions.
> 
> I'm not sure that j1939_session_skb_get is needed, I think that session->sk
> could be directly passed as can_skb_set_owner parameter. This patch
> is based on j1939_simple_txnext function which uses j1939_session_skb_get.
> I can provide an additional patch to remove the calls to
> j1939_session_skb_get function if you think they are not needed.

Thank you for your patches. By testing it I noticed that there is a memory
leak in current kernel and it seems to be even worse after this patches.
Found by this test:
https://github.com/linux-can/can-tests/blob/master/j1939/run_all.sh#L13

Can you please investigate it (or wait until I get time to do it).

Regards,
Oleksij
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