linux-kernel - Re: [PATCH] can: raw: add missing error queue support

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Message-ID: <24898bf1-ee74-0281-bbaa-b8f922904ba9@pengutronix.de>
Date:   Sun, 4 Oct 2020 11:39:45 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        linux-can@...r.kernel.org
Cc:     Oliver Hartkopp <socketcan@...tkopp.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH] can: raw: add missing error queue support

On 9/26/20 6:24 PM, Vincent Mailhol wrote:
> Error queue are not yet implemented in CAN-raw sockets.
> 
> The problem: a userland call to recvmsg(soc, msg, MSG_ERRQUEUE) on a
> CAN-raw socket would unqueue messages from the normal queue without
> any kind of error or warning. As such, it prevented CAN drivers from
> using the functionalities that relies on the error queue such as
> skb_tx_timestamp().
> 
> SCM_CAN_RAW_ERRQUEUE is defined as the type for the CAN raw error
> queue. SCM stands for "Socket control messages". The name is inspired
> from SCM_J1939_ERRQUEUE of include/uapi/linux/can/j1939.h.
> 
> Signed-off-by: Vincent Mailhol <mailhol.vincent@...adoo.fr>

Applied to linux-can-next.

Tnx,
Marc

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