diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_e610.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_e610.c
index 097a3e1c67aa..2703207a9efa 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_e610.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_e610.c
@@ -1096,11 +1096,16 @@ int ixgbe_aci_set_phy_cfg(struct ixgbe_hw *hw,
 {
 	struct ixgbe_aci_cmd_set_phy_cfg *cmd;
 	struct libie_aq_desc desc;
+	bool use_buff_eee_field;
+	u16 buf_size;
 	int err;
 
 	if (!cfg)
 		return -EINVAL;
 
+	/* If FW supports EEE, we have to use buffer with EEE field. */
+	use_buff_eee_field = hw->dev_caps.common_cap.eee_support;
+
 	cmd = libie_aq_raw(&desc);
 	/* Ensure that only valid bits of cfg->caps can be turned on. */
 	cfg->caps &= IXGBE_ACI_PHY_ENA_VALID_MASK;
@@ -1109,7 +1114,17 @@ int ixgbe_aci_set_phy_cfg(struct ixgbe_hw *hw,
 	cmd->lport_num = hw->bus.func;
 	desc.flags |= cpu_to_le16(LIBIE_AQ_FLAG_RD);
 
-	err = ixgbe_aci_send_cmd(hw, &desc, cfg, sizeof(*cfg));
+	if (use_buff_eee_field)
+		buf_size = sizeof(*cfg);
+	else
+		/* Buffer w/o eee_entry_delay field is 2B smaller. */
+		buf_size = sizeof(*cfg) - sizeof(u16);
+
+	err = ixgbe_aci_send_cmd(hw, &desc, cfg, buf_size);
+
+	/* 1.40 config format is compatible with pre-1.40, just extends
+	 * it at the end.
+	 */
 	if (!err)
 		hw->phy.curr_user_phy_cfg = *cfg;
 
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_type_e610.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_type_e610.h
index 34f62a416eaa..cfaaf2fcf7ae 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_type_e610.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_type_e610.h
@@ -382,6 +382,15 @@ struct ixgbe_aci_cmd_set_phy_cfg_data {
 	__le64 phy_type_low; /* Use values from IXGBE_PHY_TYPE_LOW_* */
 	__le64 phy_type_high; /* Use values from IXGBE_PHY_TYPE_HIGH_* */
 	u8 caps;
+	u8 low_power_ctrl_an;
+	__le16 eee_cap; /* Value from ixgbe_aci_get_phy_caps */
+	__le16 eeer_value; /* Use defines from ixgbe_aci_get_phy_caps */
+	u8 link_fec_opt; /* Use defines from ixgbe_aci_get_phy_caps */
+	u8 module_compliance_enforcement;
+	__le16  eee_entry_delay;
+} __packed;
+
+/* Set PHY config capabilities (@caps) defines */
 #define IXGBE_ACI_PHY_ENA_VALID_MASK		0xef
 #define IXGBE_ACI_PHY_ENA_TX_PAUSE_ABILITY	BIT(0)
 #define IXGBE_ACI_PHY_ENA_RX_PAUSE_ABILITY	BIT(1)
@@ -390,12 +399,6 @@ struct ixgbe_aci_cmd_set_phy_cfg_data {
 #define IXGBE_ACI_PHY_ENA_AUTO_LINK_UPDT	BIT(5)
 #define IXGBE_ACI_PHY_ENA_LESM			BIT(6)
 #define IXGBE_ACI_PHY_ENA_AUTO_FEC		BIT(7)
-	u8 low_power_ctrl_an;
-	__le16 eee_cap; /* Value from ixgbe_aci_get_phy_caps */
-	__le16 eeer_value; /* Use defines from ixgbe_aci_get_phy_caps */
-	u8 link_fec_opt; /* Use defines from ixgbe_aci_get_phy_caps */
-	u8 module_compliance_enforcement;
-};
 
 /* Restart AN command data structure (direct 0x0605)
  * Also used for response, with only the lport_num field present.