ixgbe: fix 82599 KR downshift coexistence with LESM FW module
Disable KR to KX4/KX downshift on 82599 backplane devices when
LESM (Link Establishment State Machine) is enabled in FW. Those
features cannot co-exist as they both manipulate the same registers.
Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Acked-by: Don Skidmore <donald.c.skidmore@intel.com>
Tested-by: Phillip Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ixgbe/ixgbe_82599.c b/drivers/net/ixgbe/ixgbe_82599.c
index 09934a8..d195278 100644
--- a/drivers/net/ixgbe/ixgbe_82599.c
+++ b/drivers/net/ixgbe/ixgbe_82599.c
@@ -61,6 +61,7 @@
bool autoneg,
bool autoneg_wait_to_complete);
static s32 ixgbe_verify_fw_version_82599(struct ixgbe_hw *hw);
+static bool ixgbe_verify_lesm_fw_enabled_82599(struct ixgbe_hw *hw);
static void ixgbe_init_mac_link_ops_82599(struct ixgbe_hw *hw)
{
@@ -86,7 +87,8 @@
if ((mac->ops.get_media_type(hw) ==
ixgbe_media_type_backplane) &&
(hw->phy.smart_speed == ixgbe_smart_speed_auto ||
- hw->phy.smart_speed == ixgbe_smart_speed_on))
+ hw->phy.smart_speed == ixgbe_smart_speed_on) &&
+ !ixgbe_verify_lesm_fw_enabled_82599(hw))
mac->ops.setup_link = &ixgbe_setup_mac_link_smartspeed;
else
mac->ops.setup_link = &ixgbe_setup_mac_link_82599;
@@ -2028,6 +2030,48 @@
return status;
}
+/**
+ * ixgbe_verify_lesm_fw_enabled_82599 - Checks LESM FW module state.
+ * @hw: pointer to hardware structure
+ *
+ * Returns true if the LESM FW module is present and enabled. Otherwise
+ * returns false. Smart Speed must be disabled if LESM FW module is enabled.
+ **/
+static bool ixgbe_verify_lesm_fw_enabled_82599(struct ixgbe_hw *hw)
+{
+ bool lesm_enabled = false;
+ u16 fw_offset, fw_lesm_param_offset, fw_lesm_state;
+ s32 status;
+
+ /* get the offset to the Firmware Module block */
+ status = hw->eeprom.ops.read(hw, IXGBE_FW_PTR, &fw_offset);
+
+ if ((status != 0) ||
+ (fw_offset == 0) || (fw_offset == 0xFFFF))
+ goto out;
+
+ /* get the offset to the LESM Parameters block */
+ status = hw->eeprom.ops.read(hw, (fw_offset +
+ IXGBE_FW_LESM_PARAMETERS_PTR),
+ &fw_lesm_param_offset);
+
+ if ((status != 0) ||
+ (fw_lesm_param_offset == 0) || (fw_lesm_param_offset == 0xFFFF))
+ goto out;
+
+ /* get the lesm state word */
+ status = hw->eeprom.ops.read(hw, (fw_lesm_param_offset +
+ IXGBE_FW_LESM_STATE_1),
+ &fw_lesm_state);
+
+ if ((status == 0) &&
+ (fw_lesm_state & IXGBE_FW_LESM_STATE_ENABLED))
+ lesm_enabled = true;
+
+out:
+ return lesm_enabled;
+}
+
static struct ixgbe_mac_operations mac_ops_82599 = {
.init_hw = &ixgbe_init_hw_generic,
.reset_hw = &ixgbe_reset_hw_82599,