linux-kernel - RE: [Intel-wired-lan] [PATCH net-queue 3/3] e1000e: Avoid missed interrupts following ICR read.

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Message-ID: <309B89C4C689E141A5FF6A0C5FB2118B8C7E62D1@ORSMSX103.amr.corp.intel.com>
Date:   Thu, 15 Feb 2018 03:23:57 +0000
From:   "Brown, Aaron F" <aaron.f.brown@...el.com>
To:     Benjamin Poirier <bpoirier@...e.com>,
        "Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [Intel-wired-lan] [PATCH net-queue 3/3] e1000e: Avoid missed
 interrupts following ICR read.

> From: Intel-wired-lan [mailto:intel-wired-lan-bounces@...osl.org] On
> Behalf Of Benjamin Poirier
> Sent: Wednesday, February 7, 2018 10:47 PM
> To: Kirsher, Jeffrey T <jeffrey.t.kirsher@...el.com>
> Cc: netdev@...r.kernel.org; intel-wired-lan@...ts.osuosl.org; linux-
> kernel@...r.kernel.org
> Subject: [Intel-wired-lan] [PATCH net-queue 3/3] e1000e: Avoid missed
> interrupts following ICR read.
> 
> The 82574 specification update errata 12 states that interrupts may be
> missed if ICR is read while INT_ASSERTED is not set. Avoid that problem by
> setting all bits related to events that can trigger the Other interrupt in
> IMS.
> 
> The Other interrupt is raised for such events regardless of whether or not
> they are set in IMS. However, only when they are set is the INT_ASSERTED
> bit also set in ICR.
> 
> By doing this, we ensure that INT_ASSERTED is always set when we read ICR
> in e1000_msix_other() and steer clear of the errata. This also ensures that
> ICR will automatically be cleared on read, therefore we no longer need to
> clear bits explicitly.
> 
> Signed-off-by: Benjamin Poirier <bpoirier@...e.com>
> ---
>  drivers/net/ethernet/intel/e1000e/defines.h | 21
> ++++++++++++++++++++-
>  drivers/net/ethernet/intel/e1000e/netdev.c  | 11 ++++-------
>  2 files changed, 24 insertions(+), 8 deletions(-)
> 

Tested-by: Aaron Brown <aaron.f.brown@...el.com>