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Subject: Re: canfdtest on flexcan loopback
To:     Vladimir Oltean <olteanv@gmail.com>, wg@grandegger.com,
        pankaj.bansal@nxp.com, pankaj.bansal@oss.nxp.com,
        linux-can@vger.kernel.org
Cc:     qiangqing.zhang@nxp.com, linux-kernel@vger.kernel.org,
        vladimir.oltean@nxp.com
References: <VI1PR04MB4093944944C574B138371F51F12F0@VI1PR04MB4093.eurprd04.prod.outlook.com>
 <20200916110154.hp4up6yhyokduvf2@skbuf>
 <20200916110448.dsla6vjzy4fvdr22@skbuf>
From:   Marc Kleine-Budde <mkl@pengutronix.de>
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Message-ID: <12688d2b-a198-ef5e-dd8f-64957df36574@pengutronix.de>
Date:   Wed, 16 Sep 2020 13:32:49 +0200
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From: Marc Kleine-Budde <mkl@pengutronix.de>
To: Vladimir Oltean <olteanv@gmail.com>, wg@grandegger.com,
 pankaj.bansal@nxp.com, pankaj.bansal@oss.nxp.com, linux-can@vger.kernel.org
Cc: qiangqing.zhang@nxp.com, linux-kernel@vger.kernel.org,
 vladimir.oltean@nxp.com
Message-ID: <12688d2b-a198-ef5e-dd8f-64957df36574@pengutronix.de>
Subject: Re: canfdtest on flexcan loopback
References: <VI1PR04MB4093944944C574B138371F51F12F0@VI1PR04MB4093.eurprd04.prod.outlook.com>
 <20200916110154.hp4up6yhyokduvf2@skbuf>
 <20200916110448.dsla6vjzy4fvdr22@skbuf>
In-Reply-To: <20200916110448.dsla6vjzy4fvdr22@skbuf>

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On 9/16/20 1:04 PM, Vladimir Oltean wrote:
> [ resending, forgot to copy Wolfgang ]
>=20
> On Wed 9/2/2020 10:09 AM, Wolfgang Grandegger wrote:
>> canfdtest normally runs on the DUT *and* a the host. The DUT receives
>> the messages from the host, increments the frame data bytes and then
>> sends them back to the host. With "loopback" mode, the data bytes are
>> not incremented and that's what you see above.
>>
>> Wolfgang
>=20
> Wolfgang is of course right, but we're nonetheless investigating what
> seems to be a real problem, and what Pankaj had seen was a red herring.=

>=20
> So currently what I suspect is going on, when I am running canfdtest
> between 2 LS1028A-RDB boards, is that the DUT is reordering frames on
> TX.
>=20
> See, for example, the screenshot below:
> https://drive.google.com/file/d/1rOeW3aXh3kPh1CJ39lCccRfjFz5JN5I6/view?=
usp=3Dsharing
>=20
> I have added trace points to the end of the flexcan_start_xmit function=
,
> which print the entire skb, and the frames appear to be written to the
> TX message buffer in the correct order. They are seen, however, in the
> incorrect order on the wire.

Which driver are you using? The mainline driver only uses one TX buffer.

Marc

--=20
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |


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