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ixgbe: Filter out spurious link up indication

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Add delayed link state recheck to filter false link up indication
caused by transceiver with no fiber cable attached.

Signed-off-by: Sebastian Czapla <sebastianx.czapla@intel.com>
Tested-by: Sunitha Mekala <sunithax.d.mekala@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
This commit is contained in:
Sebastian Czapla
2022-12-12 10:59:38 +01:00
committed by Tony Nguyen
parent 3fe1d0a48d
commit 6f8179c192
1 changed files with 18 additions and 3 deletions
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21
drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
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@@ -3292,13 +3292,14 @@ static bool ixgbe_need_crosstalk_fix(struct ixgbe_hw *hw)
s32 ixgbe_check_mac_link_generic(struct ixgbe_hw *hw, ixgbe_link_speed *speed,
bool *link_up, bool link_up_wait_to_complete)
{
bool crosstalk_fix_active = ixgbe_need_crosstalk_fix(hw);
u32 links_reg, links_orig;
u32 i;
/* If Crosstalk fix enabled do the sanity check of making sure
* the SFP+ cage is full.
*/
if (ixgbe_need_crosstalk_fix(hw)) {
if (crosstalk_fix_active) {
u32 sfp_cage_full;
switch (hw->mac.type) {
@@ -3346,10 +3347,24 @@ s32 ixgbe_check_mac_link_generic(struct ixgbe_hw *hw, ixgbe_link_speed *speed,
links_reg = IXGBE_READ_REG(hw, IXGBE_LINKS);
}
} else {
if (links_reg & IXGBE_LINKS_UP)
if (links_reg & IXGBE_LINKS_UP) {
if (crosstalk_fix_active) {
/* Check the link state again after a delay
* to filter out spurious link up
* notifications.
*/
mdelay(5);
links_reg = IXGBE_READ_REG(hw, IXGBE_LINKS);
if (!(links_reg & IXGBE_LINKS_UP)) {
*link_up = false;
*speed = IXGBE_LINK_SPEED_UNKNOWN;
return 0;
}
}
*link_up = true;
else
} else {
*link_up = false;
}
}
switch (links_reg & IXGBE_LINKS_SPEED_82599) {