netdev - Re: [PATCH v3 3/6] can: c_can: fix control interface used by c_can_do

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Date:   Wed, 3 Mar 2021 08:22:45 +0100 (CET)
From:   Dario Binacchi <dariobin@...ero.it>
To:     Kurt Van Dijck <dev.kurt@...dijck-laurijssen.be>
Cc:     linux-kernel@...r.kernel.org,
        Federico Vaga <federico.vaga@...il.com>,
        Alexander Stein <alexander.stein@...tec-electronic.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        YueHaibing <yuehaibing@...wei.com>,
        Zhang Qilong <zhangqilong3@...wei.com>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v3 3/6] can: c_can: fix control interface used by
 c_can_do_tx

Hi Kurt,

> Il 02/03/2021 19:44 Kurt Van Dijck <dev.kurt@...dijck-laurijssen.be> ha scritto:
> 
>  
> 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@...ero.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 well.

Take a look at https://lore.kernel.org/patchwork/patch/1384649/

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