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

[Andrew Lunn]

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

commit 88fda8eefd9a7a7175bf4dad1d02cc0840581111
Author: Christian Eggers <ceggers@xxxxxxx>
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.