linux-kernel - Re: [PATCH 1/2] net: dsa: ksz: pad frame to 64 bytes for transmission

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Message-ID: <CAORVsuUez9qteuuqkGpQbU5yXjAFxcpRXGaXnKwqm-hKSKF6NQ@mail.gmail.com>
Date:   Sun, 29 Nov 2020 20:34:27 +0100
From:   Jean Pihet <jean.pihet@...oldbits.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Ryan Barnett <ryan.barnett@...kwellcollins.com>,
        Conrad Ratschan <conrad.ratschan@...kwellcollins.com>,
        Hugo Cornelis <hugo.cornelis@...ensium.com>,
        Arnout Vandecappelle <arnout.vandecappelle@...ensium.com>
Subject: Re: [PATCH 1/2] net: dsa: ksz: pad frame to 64 bytes for transmission

Hi Andrew,

On Sun, Nov 29, 2020 at 5:56 PM Andrew Lunn <andrew@...n.ch> wrote:
>
> On Sun, Nov 29, 2020 at 11:23:59AM +0100, Jean Pihet wrote:
> > Some ethernet controllers (e.g. TI CPSW) pad the frames to a minimum
> > of 64 bytes before the FCS is appended. This causes an issue with the
> > KSZ tail tag which could not be the last byte before the FCS.
> > Solve this by padding the frame to 64 bytes minus the tail tag size,
> > before the tail tag is added and the frame is passed for transmission.
>
> Hi Jean
>
> what tree is this based on? Have you seen
The patches are based on the latest mainline v5.10-rc5. Is this the
recommended version to submit new patches?

>
> commit 88fda8eefd9a7a7175bf4dad1d02cc0840581111
> Author: Christian Eggers <ceggers@...i.de>
> Date:   Sun Nov 1 21:16:10 2020 +0200
>
>     net: dsa: tag_ksz: don't allocate additional memory for padding/tagging
>
>     The caller (dsa_slave_xmit) guarantees that the frame length is at least
>     ETH_ZLEN and that enough memory for tail tagging is available.
>

I cannot find this commit. Which tree/branch is it from?

Thanks for reviewing,
Jean