linux-kernel - Re: [PATCH net] net: macb: fix PTP TX timestamp failure due to packet padding

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Message-Id: <167405221689.16594.624017223236152220.git-patchwork-notify@kernel.org>
Date:   Wed, 18 Jan 2023 14:30:16 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Robert Hancock <robert.hancock@...ian.com>
Cc:     nicolas.ferre@...rochip.com, claudiu.beznea@...rochip.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, richardcochran@...il.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: macb: fix PTP TX timestamp failure due to packet
 padding

Hello:

This patch was applied to netdev/net.git (master)
by David S. Miller <davem@...emloft.net>:

On Mon, 16 Jan 2023 15:41:33 -0600 you wrote:
> PTP TX timestamp handling was observed to be broken with this driver
> when using the raw Layer 2 PTP encapsulation. ptp4l was not receiving
> the expected TX timestamp after transmitting a packet, causing it to
> enter a failure state.
> 
> The problem appears to be due to the way that the driver pads packets
> which are smaller than the Ethernet minimum of 60 bytes. If headroom
> space was available in the SKB, this caused the driver to move the data
> back to utilize it. However, this appears to cause other data references
> in the SKB to become inconsistent. In particular, this caused the
> ptp_one_step_sync function to later (in the TX completion path) falsely
> detect the packet as a one-step SYNC packet, even when it was not, which
> caused the TX timestamp to not be processed when it should be.
> 
> [...]

Here is the summary with links:
  - [net] net: macb: fix PTP TX timestamp failure due to packet padding
    https://git.kernel.org/netdev/net/c/7b90f5a665ac

You are awesome, thank you!
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