linux-kernel - Re: [PATCH net] net: enetc: preserve TX ring priority across reconfiguration

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Message-Id: <166926421531.27044.935878443390847890.git-patchwork-notify@kernel.org>
Date:   Thu, 24 Nov 2022 04:30:15 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, claudiu.manoil@....com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: enetc: preserve TX ring priority across
 reconfiguration

Hello:

This patch was applied to netdev/net.git (master)
by Jakub Kicinski <kuba@...nel.org>:

On Tue, 22 Nov 2022 15:09:36 +0200 you wrote:
> In the blamed commit, a rudimentary reallocation procedure for RX buffer
> descriptors was implemented, for the situation when their format changes
> between normal (no PTP) and extended (PTP).
> 
> enetc_hwtstamp_set() calls enetc_close() and enetc_open() in a sequence,
> and this sequence loses information which was previously configured in
> the TX BDR Mode Register, specifically via the enetc_set_bdr_prio() call.
> The TX ring priority is configured by tc-mqprio and tc-taprio, and
> affects important things for TSN such as the TX time of packets. The
> issue manifests itself most visibly by the fact that isochron --txtime
> reports premature packet transmissions when PTP is first enabled on an
> enetc interface.
> 
> [...]

Here is the summary with links:
  - [net] net: enetc: preserve TX ring priority across reconfiguration
    https://git.kernel.org/netdev/net/c/290b5fe096e7

You are awesome, thank you!
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