linux-kernel - Re: [PATCH net 1/1] igc: Fix double reset adapter triggered from a single taprio cmd

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Date: Fri, 28 Jun 2024 01:46:20 +0300
From: Vladimir Oltean <vladimir.oltean@....com>
To: "Abdul Rahim, Faizal" <faizal.abdul.rahim@...ux.intel.com>
Cc: "David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Tony Nguyen <anthony.l.nguyen@...el.com>,
	Vinicius Costa Gomes <vinicius.gomes@...el.com>,
	intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	muhammad.husaini.zulkifli@...el.com
Subject: Re: [PATCH net 1/1] igc: Fix double reset adapter triggered from a
 single taprio cmd

On Wed, Jun 26, 2024 at 09:19:12AM +0800, Abdul Rahim, Faizal wrote:
> Added Vladimir and Husaini in CC.
> 
> On 25/6/2024 4:26 pm, Faizal Rahim wrote:
> > Following the implementation of "igc: Add TransmissionOverrun counter"
> > patch, when a taprio command is triggered by user, igc processes two
> > commands: TAPRIO_CMD_REPLACE followed by TAPRIO_CMD_STATS. However, both
> > commands unconditionally pass through igc_tsn_offload_apply() which
> > evaluates and triggers reset adapter. The double reset causes issues in
> > the calculation of adapter->qbv_count in igc.
> > 
> > TAPRIO_CMD_REPLACE command is expected to reset the adapter since it
> > activates qbv. It's unexpected for TAPRIO_CMD_STATS to do the same
> > because it doesn't configure any driver-specific TSN settings. So, the
> > evaluation in igc_tsn_offload_apply() isn't needed for TAPRIO_CMD_STATS.
> > 
> > To address this, commands parsing are relocated to
> > igc_tsn_enable_qbv_scheduling(). Commands that don't require an adapter
> > reset will exit after processing, thus avoiding igc_tsn_offload_apply().
> > 
> > Fixes: d3750076d464 ("igc: Add TransmissionOverrun counter")
> > Signed-off-by: Faizal Rahim <faizal.abdul.rahim@...ux.intel.com>
> > ---

Thank you for the patch. The code organization is much more logical this way.

Reviewed-by: Vladimir Oltean <vladimir.oltean@....com>