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authorEmil Tantilov <emil.s.tantilov@intel.com>2014-08-13 05:52:13 +0000
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>2014-09-04 01:38:32 -0700
commitb8a2ca19bc1479745952967ec998fd92de92ec85 (patch)
treee2e8ed9adeecda91f88ed418e612e9eabe37225e /drivers/net/ethernet/intel/ixgbevf/vf.c
parent07923c17b15e5251bb6e22e5f05be0d1009858d6 (diff)
downloadlinux-linaro-stable-b8a2ca19bc1479745952967ec998fd92de92ec85.tar.gz
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: Emil Tantilov <emil.s.tantilov@intel.com> Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers/net/ethernet/intel/ixgbevf/vf.c')
-rw-r--r--drivers/net/ethernet/intel/ixgbevf/vf.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/ixgbevf/vf.c b/drivers/net/ethernet/intel/ixgbevf/vf.c
index 4d44d64ae387..9cddd56d02c3 100644
--- a/drivers/net/ethernet/intel/ixgbevf/vf.c
+++ b/drivers/net/ethernet/intel/ixgbevf/vf.c
@@ -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;