[Intel-wired-lan] [net-next v2] i40e: Add a check to see if MFS is set

Bowers, AndrewX andrewx.bowers at intel.com
Wed Apr 22 18:49:03 UTC 2020

-----Original Message-----
From: Intel-wired-lan <intel-wired-lan-bounces at osuosl.org> On Behalf Of Jeff Kirsher
Sent: Tuesday, April 21, 2020 3:18 PM
To: intel-wired-lan at lists.osuosl.org
Subject: [Intel-wired-lan] [net-next v2] i40e: Add a check to see if MFS is set

From: Todd Fujinaka <todd.fujinaka at intel.com>

A customer was chain-booting to provision his systems and one of the steps was setting MFS. MFS isn't cleared by normal warm reboots (clearing requires a GLOBR) and there was no indication of why Jumbo Frame receives were failing.

Add a warning if MFS is set to anything lower than the default.

Signed-off-by: Todd Fujinaka <todd.fujinaka at intel.com>
v2: fix the math calculation on accessing the SAH register

 drivers/net/ethernet/intel/i40e/i40e_main.c | 9 +++++++++
 1 file changed, 9 insertions(+)

Tested-by: Andrew Bowers <andrewx.bowers at intel.com>

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