i40e: Add a check to see if MFS is set (3a2c6ced) · Commits · 戴 / test

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>

drivers/net/ethernet/intel/i40e/i40e_main.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -15290,6 +15290,14 @@ static int i40e_probe(struct pci_dev pdev, const struct pci_device_id ent)
		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

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