netdev - Re: [PATCH iwl-net 2/3] ice: unify logic for programming PFINT_TSYN

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Date: Sat, 4 Nov 2023 11:24:15 -0400
From: Simon Horman <horms@...nel.org>
To: Jacob Keller <jacob.e.keller@...el.com>
Cc: Anthony Nguyen <anthony.l.nguyen@...el.com>,
	Intel Wired LAN <intel-wired-lan@...ts.osuosl.org>,
	netdev@...r.kernel.org,
	Jesse Brandeburg <jesse.brandeburg@...el.com>
Subject: Re: [PATCH iwl-net 2/3] ice: unify logic for programming
 PFINT_TSYN_MSK

On Fri, Nov 03, 2023 at 04:46:57PM -0700, Jacob Keller wrote:
> Commit d938a8cca88a ("ice: Auxbus devices & driver for E822 TS") modified
> how Tx timestamps are handled for E822 devices. On these devices, only the
> clock owner handles reading the Tx timestamp data from firmware. To do
> this, the PFINT_TSYN_MSK register is modified from the default value to one
> which enables reacting to a Tx timestamp on all PHY ports.
> 
> The driver currently programs PFINT_TSYN_MSK in different places depending
> on whether the port is the clock owner or not. For the clock owner, the
> PFINT_TSYN_MSK value is programmed during ice_ptp_init_owner just before
> calling ice_ptp_tx_ena_intr to program the PHY ports.
> 
> For the non-clock owner ports, the PFINT_TSYN_MSK is programmed during
> ice_ptp_init_port.
> 
> If a large enough device reset occurs, the PFINT_TSYN_MSK register will be
> reset to the default value in which only the PHY associated directly with
> the PF will cause the Tx timestamp interrupt to trigger.
> 
> The driver lacks logic to reprogram the PFINT_TSYN_MSK register after a
> device reset. For the E822 device, this results in the PF no longer
> responding to interrupts for other ports. This results in failure to
> deliver Tx timestamps to user space applications.
> 
> Rename ice_ptp_configure_tx_tstamp to ice_ptp_cfg_tx_interrupt, and unify
> the logic for programming PFINT_TSYN_MSK and PFINT_OICR_ENA into one place.
> This function will program both registers according to the combination of
> user configuration and device requirements.
> 
> This ensures that PFINT_TSYN_MSK is always restored when we configure the
> Tx timestamp interrupt.
> 
> Fixes: d938a8cca88a ("ice: Auxbus devices & driver for E822 TS")
> Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
> Reviewed-by: Jesse Brandeburg <jesse.brandeburg@...el.com>

Reviewed-by: Simon Horman <horms@...nel.org>