linux-kernel - Re: [PATCH v2 3/3] can-isotp: Add error message if txqueuelen is too small

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Message-ID: <20210427071603.gkq27ogz6ocgroov@pengutronix.de>
Date:   Tue, 27 Apr 2021 09:16:03 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Patrick Menschel <menschel.p@...teo.de>
Cc:     Oliver Hartkopp <socketcan@...tkopp.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-can@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] can-isotp: Add error message if txqueuelen is too
 small

On 27.04.2021 05:21:49, Patrick Menschel wrote:
> This patch adds an additional error message in
> case that txqueuelen is set too small and
> advices the user to increase txqueuelen.
> 
> This is likely to happen even with small transfers if
> txqueuelen is at default value 10 frames.
> 
> Signed-off-by: Patrick Menschel <menschel.p@...teo.de>
> ---
>  net/can/isotp.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/net/can/isotp.c b/net/can/isotp.c
> index 2075d8d9e..d08f95bfd 100644
> --- a/net/can/isotp.c
> +++ b/net/can/isotp.c
> @@ -797,10 +797,12 @@ static enum hrtimer_restart isotp_tx_timer_handler(struct hrtimer *hrtimer)
>  		can_skb_set_owner(skb, sk);
>  
>  		can_send_ret = can_send(skb, 1);
> -		if (can_send_ret)
> +		if (can_send_ret) {
>  			pr_notice_once("can-isotp: %s: can_send_ret %pe\n",
>  				       __func__, ERR_PTR(can_send_ret));
> -
> +			if (can_send_ret == -ENOBUFS)
> +				pr_notice_once("can-isotp: tx queue is full, increasing txqueuelen may prevent this error");

I've added the missing "\n" at the end while applying the patch to
linux-can-next/testing.

regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
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