From: Todd Fujinaka <todd.fujinaka@intel.com>
Date: Thu, 28 May 2020 22:27:12 -0700
Subject: i40e: Add a check to see if MFS is set
Patch-mainline: v5.9-rc1
Git-commit: 3a2c6ced90e18326ec64b9c4b5f68a2a127004c0
References: jsc#SLE-13701
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@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/net/ethernet/intel/i40e/i40e_main.c | 8 ++++++++
1 file changed, 8 insertions(+)
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -15299,6 +15299,14 @@ static int i40e_probe(struct pci_dev *pd
i40e_stat_str(&pf->hw, err),
i40e_aq_str(&pf->hw, pf->hw.aq.asq_last_status));
+ /* make sure the MFS hasn't been set lower than the default */
+#define MAX_FRAME_SIZE_DEFAULT 0x2600
+ val = (rd32(&pf->hw, I40E_PRTGL_SAH) &
+ I40E_PRTGL_SAH_MFS_MASK) >> I40E_PRTGL_SAH_MFS_SHIFT;
+ if (val < MAX_FRAME_SIZE_DEFAULT)
+ dev_warn(&pdev->dev, "MFS for port %x has been set below the default: %x\n",
+ i, val);
+
/* Add a filter to drop all Flow control frames from any VSI from being
* transmitted. By doing so we stop a malicious VF from sending out
* PAUSE or PFC frames and potentially controlling traffic for other