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| author | Emil Tantilov <emil.s.tantilov@intel.com> | 2014-08-13 05:52:13 +0000 |
|---|---|---|
| committer | Jeff Kirsher <jeffrey.t.kirsher@intel.com> | 2014-09-04 01:38:32 -0700 |
| commit | b8a2ca19bc1479745952967ec998fd92de92ec85 (patch) | |
| tree | e2e8ed9adeecda91f88ed418e612e9eabe37225e /drivers/net/ethernet/intel/ixgbevf | |
| parent | 07923c17b15e5251bb6e22e5f05be0d1009858d6 (diff) | |
| download | linux-b8a2ca19bc1479745952967ec998fd92de92ec85.tar.gz linux-b8a2ca19bc1479745952967ec998fd92de92ec85.tar.bz2 linux-b8a2ca19bc1479745952967ec998fd92de92ec85.zip | |
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')
| -rw-r--r-- | drivers/net/ethernet/intel/ixgbevf/vf.c | 15 |
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; |