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Commit b8a2ca19 authored by Emil Tantilov's avatar Emil Tantilov Committed by Jeff Kirsher
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ixgbevf: introduce delay for checking VFLINKS on 82599 



VFLINKS.LINKUP bit tends to flap when a DA or SFP+ cable is disconnected.
It can take up to 500 usecs for the LINKUP bit to be correct.

This patch resolves the issue by introducing a delay for 82599 VFs of at
least 500 usecs to make sure the VFLINKS value is correct.

Signed-off-by: default avatarEmil Tantilov <emil.s.tantilov@intel.com>
Tested-by: default avatarPhil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent 07923c17

drivers/net/ethernet/intel/ixgbevf/vf.c

+15 −0
Original line number Diff line number Diff line
@@ -434,6 +434,21 @@ static s32 ixgbevf_check_mac_link_vf(struct ixgbe_hw *hw, 
	if (!(links_reg & IXGBE_LINKS_UP))

		goto out;



	/* for SFP+ modules and DA cables on 82599 it can take up to 500usecs

	 * before the link status is correct

	 */

	if (mac->type == ixgbe_mac_82599_vf) {

		int i;



		for (i = 0; i < 5; i++) {

			udelay(100);

			links_reg = IXGBE_READ_REG(hw, IXGBE_VFLINKS);



			if (!(links_reg & IXGBE_LINKS_UP))

				goto out;

		}

	}



	switch (links_reg & IXGBE_LINKS_SPEED_82599) {

	case IXGBE_LINKS_SPEED_10G_82599:

		*speed = IXGBE_LINK_SPEED_10GB_FULL;