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Date:   Tue, 2 Mar 2021 19:44:51 +0100
From:   Kurt Van Dijck <dev.kurt@vandijck-laurijssen.be>
To:     Dario Binacchi <dariobin@libero.it>
Cc:     linux-kernel@vger.kernel.org,
        Federico Vaga <federico.vaga@gmail.com>,
        Alexander Stein <alexander.stein@systec-electronic.com>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Marc Kleine-Budde <mkl@pengutronix.de>,
        Oliver Hartkopp <socketcan@hartkopp.net>,
        Vincent Mailhol <mailhol.vincent@wanadoo.fr>,
        Wolfgang Grandegger <wg@grandegger.com>,
        YueHaibing <yuehaibing@huawei.com>,
        Zhang Qilong <zhangqilong3@huawei.com>,
        linux-can@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [PATCH v3 3/6] can: c_can: fix control interface used by
 c_can_do_tx
Message-ID: <20210302184451.GC26930@x1.vandijck-laurijssen.be>
Mail-Followup-To: Dario Binacchi <dariobin@libero.it>,
        linux-kernel@vger.kernel.org,
        Federico Vaga <federico.vaga@gmail.com>,
        Alexander Stein <alexander.stein@systec-electronic.com>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Marc Kleine-Budde <mkl@pengutronix.de>,
        Oliver Hartkopp <socketcan@hartkopp.net>,
        Vincent Mailhol <mailhol.vincent@wanadoo.fr>,
        Wolfgang Grandegger <wg@grandegger.com>,
        YueHaibing <yuehaibing@huawei.com>,
        Zhang Qilong <zhangqilong3@huawei.com>, linux-can@vger.kernel.org,
        netdev@vger.kernel.org
References: <20210228103856.4089-1-dariobin@libero.it>
 <20210228103856.4089-4-dariobin@libero.it>
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On Sun, 28 Feb 2021 11:38:52 +0100, Dario Binacchi wrote:
> According to commit 640916db2bf7 ("can: c_can: Make it SMP safe") let RX use
> IF1 (i.e. IF_RX) and TX use IF2 (i.e. IF_TX).
> 
> Signed-off-by: Dario Binacchi <dariobin@libero.it>
> ---
> 
> (no changes since v1)
> 
>  drivers/net/can/c_can/c_can.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
> index dbcc1c1c92d6..69526c3a671c 100644
> --- a/drivers/net/can/c_can/c_can.c
> +++ b/drivers/net/can/c_can/c_can.c
> @@ -732,7 +732,7 @@ static void c_can_do_tx(struct net_device *dev)
>  		idx--;
>  		pend &= ~(1 << idx);
>  		obj = idx + C_CAN_MSG_OBJ_TX_FIRST;
> -		c_can_inval_tx_object(dev, IF_RX, obj);
> +		c_can_inval_tx_object(dev, IF_TX, obj);

Right. I had a similar effort last year to increase the reception
throughput, but I ended with some sporadic strange tx echo problems.
This fix may have fixed my problem as wel.

>  		can_get_echo_skb(dev, idx, NULL);
>  		bytes += priv->dlc[idx];
>  		pkts++;
> -- 
> 2.17.1
>