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To:     Vladimir Oltean <vladimir.oltean@nxp.com>
Cc:     Vladimir Oltean <olteanv@gmail.com>,
        "wg@grandegger.com" <wg@grandegger.com>,
        Pankaj Bansal <pankaj.bansal@nxp.com>,
        "Pankaj Bansal (OSS)" <pankaj.bansal@oss.nxp.com>,
        "linux-can@vger.kernel.org" <linux-can@vger.kernel.org>,
        Joakim Zhang <qiangqing.zhang@nxp.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
References: <20200918122716.kzxvocxelqwdw7uq@skbuf>
From:   Marc Kleine-Budde <mkl@pengutronix.de>
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Subject: Re: canfdtest on flexcan loopback
Message-ID: <2b292dde-5385-035d-dc99-031d61ff67c7@pengutronix.de>
Date:   Fri, 18 Sep 2020 14:35:59 +0200
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From: Marc Kleine-Budde <mkl@pengutronix.de>
To: Vladimir Oltean <vladimir.oltean@nxp.com>
Cc: Vladimir Oltean <olteanv@gmail.com>, "wg@grandegger.com"
 <wg@grandegger.com>, Pankaj Bansal <pankaj.bansal@nxp.com>,
 "Pankaj Bansal (OSS)" <pankaj.bansal@oss.nxp.com>,
 "linux-can@vger.kernel.org" <linux-can@vger.kernel.org>,
 Joakim Zhang <qiangqing.zhang@nxp.com>,
 "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Message-ID: <2b292dde-5385-035d-dc99-031d61ff67c7@pengutronix.de>
Subject: Re: canfdtest on flexcan loopback
References: <20200918122716.kzxvocxelqwdw7uq@skbuf>
In-Reply-To: <20200918122716.kzxvocxelqwdw7uq@skbuf>

--hk0Ldn7DW8XP9pqB9Y0nCJbDtXD7pF4Ye
Content-Type: text/plain; charset=utf-8
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On 9/18/20 2:27 PM, Vladimir Oltean wrote:
>> Is there a bug in v5.4.3? v5.4.66 is current latest v5.4.x

> commit 63d5320a0c9b9867628a3a5a12e7f11d4cc109c2
> Author: Paolo Abeni <pabeni@redhat.com>
> Date:   Tue Feb 18 18:15:44 2020 +0100
>=20
>     Revert "net: dev: introduce support for sch BYPASS for lockless qdi=
sc"
>=20
>     [ Upstream commit 379349e9bc3b42b8b2f8f7a03f64a97623fff323 ]
>=20
>     This reverts commit ba27b4cdaaa66561aaedb2101876e563738d36fe
>=20
>     Ahmed reported ouf-of-order issues bisected to commit ba27b4cdaaa6

yes, that's probably the the issue.

This concluded into using an old LTS kernel, is worse than using the late=
st
kernel :)

>     ("net: dev: introduce support for sch BYPASS for lockless qdisc").
>     I can't find any working solution other than a plain revert.
>=20
>     This will introduce some minor performance regressions for
>     pfifo_fast qdisc. I plan to address them in net-next with more
>     indirect call wrapper boilerplate for qdiscs.
>=20
>     Reported-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
>     Fixes: ba27b4cdaaa6 ("net: dev: introduce support for sch BYPASS fo=
r lockless qdisc")
>     Signed-off-by: Paolo Abeni <pabeni@redhat.com>
>     Signed-off-by: David S. Miller <davem@davemloft.net>
>     Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
>=20
>  net/core/dev.c | 22 ++--------------------
>  1 file changed, 2 insertions(+), 20 deletions(-)

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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