netdev - RE: [PATCH v3] ixgbe: Manual AN-37 for troublesome link partners for X550 SFI

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Date:   Thu, 18 Aug 2022 21:49:23 +0000
From:   "Switzer, David" <david.switzer@...el.com>
To:     "Daly, Jeff" <jeffd@...icom-usa.com>,
        "intel-wired-lan@...osl.org" <intel-wired-lan@...osl.org>
CC:     "Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Jakub Kicinski" <kuba@...nel.org>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v3] ixgbe: Manual AN-37 for troublesome link partners for
 X550 SFI



>-----Original Message-----
>From: Daly, Jeff <jeffd@...icom-usa.com>
>Sent: Thursday, July 21, 2022 7:11 AM
>To: intel-wired-lan@...osl.org
>Cc: Brandeburg, Jesse <jesse.brandeburg@...el.com>; Nguyen, Anthony L
><anthony.l.nguyen@...el.com>; David S. Miller <davem@...emloft.net>;
>Jakub Kicinski <kuba@...nel.org>; intel-wired-lan@...ts.osuosl.org;
>netdev@...r.kernel.org; linux-kernel@...r.kernel.org
>Subject: [PATCH v3] ixgbe: Manual AN-37 for troublesome link partners for
>X550 SFI
>
>Some (Juniper MX5) SFP link partners exhibit a disinclination to autonegotiate
>with X550 configured in SFI mode.  This patch enables a manual AN-37 restart
>to work around the problem.
>
>Signed-off-by: Jeff Daly <jeffd@...icom-usa.com>
>---
> drivers/net/ethernet/intel/ixgbe/ixgbe_type.h |  3 +
>drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c | 56 ++++++++++++++++++-
> 2 files changed, 56 insertions(+), 3 deletions(-)

We don't have the specific link partner that this patch fixes, but we have verified that AN wasn't hindered or broken with the link partners that we have.

Tested-by: Dave Switzer <david.switzer@...el.com>