ixgbe: Enable flow control pause parameter auto-negotiation support

This patch enables flow control pause parameters auto-negotiation support
to 82599 based 10G Base-T, backplane devices and multi-speed fiber optics
modules at 1G speed

Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Tested-by: Stephen Ko <stephen.s.ko@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

6 files changed, 281 insertions, 199 deletions

diff --git a/drivers/net/ixgbe/ixgbe_82598.c b/drivers/net/ixgbe/ixgbe_82598.c
index dc977b1c8eab..ff23907bde0c 100644
--- a/drivers/net/ixgbe/ixgbe_82598.c
+++ b/drivers/net/ixgbe/ixgbe_82598.c
@@ -366,7 +366,7 @@ static s32 ixgbe_fc_enable_82598(struct ixgbe_hw *hw, s32 packetbuf_num)
 
         /* Negotiate the fc mode to use */
         ret_val = ixgbe_fc_autoneg(hw);
-        if (ret_val)
+        if (ret_val == IXGBE_ERR_FLOW_CONTROL)
                 goto out;
 
         /* Disable any previous flow control settings */
@@ -384,10 +384,10 @@ static s32 ixgbe_fc_enable_82598(struct ixgbe_hw *hw, s32 packetbuf_num)
          * 2: Tx flow control is enabled (we can send pause frames but
          *     we do not support receiving pause frames).
          * 3: Both Rx and Tx flow control (symmetric) are enabled.
-         * other: Invalid.
 #ifdef CONFIG_DCB
          * 4: Priority Flow Control is enabled.
 #endif
+         * other: Invalid.
          */
         switch (hw->fc.current_mode) {
         case ixgbe_fc_none:
@@ -444,9 +444,10 @@ static s32 ixgbe_fc_enable_82598(struct ixgbe_hw *hw, s32 packetbuf_num)
                 reg = (rx_pba_size - hw->fc.low_water) << 6;
                 if (hw->fc.send_xon)
                         reg |= IXGBE_FCRTL_XONE;
+
                 IXGBE_WRITE_REG(hw, IXGBE_FCRTL(packetbuf_num), reg);
 
-                reg = (rx_pba_size - hw->fc.high_water) << 10;
+                reg = (rx_pba_size - hw->fc.high_water) << 6;
                 reg |= IXGBE_FCRTH_FCEN;
 
                 IXGBE_WRITE_REG(hw, IXGBE_FCRTH(packetbuf_num), reg);
diff --git a/drivers/net/ixgbe/ixgbe_82599.c b/drivers/net/ixgbe/ixgbe_82599.c
index 2f8b9f41714f..00aeba385a2f 100644
--- a/drivers/net/ixgbe/ixgbe_82599.c
+++ b/drivers/net/ixgbe/ixgbe_82599.c
@@ -772,6 +772,9 @@ static s32 ixgbe_setup_mac_link_82599(struct ixgbe_hw *hw,
 
         /* Check to see if speed passed in is supported. */
         hw->mac.ops.get_link_capabilities(hw, &link_capabilities, &autoneg);
+        if (status != 0)
+                goto out;
+
         speed &= link_capabilities;
 
         if (speed == IXGBE_LINK_SPEED_UNKNOWN) {
diff --git a/drivers/net/ixgbe/ixgbe_common.c b/drivers/net/ixgbe/ixgbe_common.c
index 561f666618e4..7a6a3fbee19f 100644
--- a/drivers/net/ixgbe/ixgbe_common.c
+++ b/drivers/net/ixgbe/ixgbe_common.c
@@ -47,6 +47,12 @@ static void ixgbe_lower_eeprom_clk(struct ixgbe_hw *hw, u32 *eec);
 static void ixgbe_release_eeprom(struct ixgbe_hw *hw);
 
 static s32 ixgbe_mta_vector(struct ixgbe_hw *hw, u8 *mc_addr);
+static s32 ixgbe_fc_autoneg_fiber(struct ixgbe_hw *hw);
+static s32 ixgbe_fc_autoneg_backplane(struct ixgbe_hw *hw);
+static s32 ixgbe_fc_autoneg_copper(struct ixgbe_hw *hw);
+static s32 ixgbe_device_supports_autoneg_fc(struct ixgbe_hw *hw);
+static s32 ixgbe_negotiate_fc(struct ixgbe_hw *hw, u32 adv_reg, u32 lp_reg,
+                              u32 adv_sym, u32 adv_asm, u32 lp_sym, u32 lp_asm);
 static s32 ixgbe_setup_fc(struct ixgbe_hw *hw, s32 packetbuf_num);
 
 /**
@@ -1566,7 +1572,7 @@ s32 ixgbe_fc_enable_generic(struct ixgbe_hw *hw, s32 packetbuf_num)
 #endif /* CONFIG_DCB */
         /* Negotiate the fc mode to use */
         ret_val = ixgbe_fc_autoneg(hw);
-        if (ret_val)
+        if (ret_val == IXGBE_ERR_FLOW_CONTROL)
                 goto out;
 
         /* Disable any previous flow control settings */
@@ -1674,12 +1680,13 @@ out:
  **/
 s32 ixgbe_fc_autoneg(struct ixgbe_hw *hw)
 {
-        s32 ret_val = 0;
+        s32 ret_val = IXGBE_ERR_FC_NOT_NEGOTIATED;
         ixgbe_link_speed speed;
-        u32 pcs_anadv_reg, pcs_lpab_reg, linkstat;
-        u32 links2, anlp1_reg, autoc_reg, links;
         bool link_up;
 
+        if (hw->fc.disable_fc_autoneg)
+                goto out;
+
         /*
          * AN should have completed when the cable was plugged in.
          * Look for reasons to bail out.  Bail out if:
@@ -1690,153 +1697,199 @@ s32 ixgbe_fc_autoneg(struct ixgbe_hw *hw)
          * So use link_up_wait_to_complete=false.
          */
         hw->mac.ops.check_link(hw, &speed, &link_up, false);
-
-        if (hw->fc.disable_fc_autoneg || (!link_up)) {
-                hw->fc.fc_was_autonegged = false;
-                hw->fc.current_mode = hw->fc.requested_mode;
+        if (!link_up) {
+                ret_val = IXGBE_ERR_FLOW_CONTROL;
                 goto out;
         }
 
-        /*
-         * On backplane, bail out if
-         * - backplane autoneg was not completed, or if
-         * - we are 82599 and link partner is not AN enabled
-         */
-        if (hw->phy.media_type == ixgbe_media_type_backplane) {
-                links = IXGBE_READ_REG(hw, IXGBE_LINKS);
-                if ((links & IXGBE_LINKS_KX_AN_COMP) == 0) {
-                        hw->fc.fc_was_autonegged = false;
-                        hw->fc.current_mode = hw->fc.requested_mode;
-                        goto out;
-                }
+        switch (hw->phy.media_type) {
+        /* Autoneg flow control on fiber adapters */
+        case ixgbe_media_type_fiber:
+                if (speed == IXGBE_LINK_SPEED_1GB_FULL)
+                        ret_val = ixgbe_fc_autoneg_fiber(hw);
+                break;
 
-                if (hw->mac.type == ixgbe_mac_82599EB) {
-                        links2 = IXGBE_READ_REG(hw, IXGBE_LINKS2);
-                        if ((links2 & IXGBE_LINKS2_AN_SUPPORTED) == 0) {
-                                hw->fc.fc_was_autonegged = false;
-                                hw->fc.current_mode = hw->fc.requested_mode;
-                                goto out;
-                        }
-                }
+        /* Autoneg flow control on backplane adapters */
+        case ixgbe_media_type_backplane:
+                ret_val = ixgbe_fc_autoneg_backplane(hw);
+                break;
+
+        /* Autoneg flow control on copper adapters */
+        case ixgbe_media_type_copper:
+                if (ixgbe_device_supports_autoneg_fc(hw) == 0)
+                        ret_val = ixgbe_fc_autoneg_copper(hw);
+                break;
+
+        default:
+                break;
+        }
+
+out:
+        if (ret_val == 0) {
+                hw->fc.fc_was_autonegged = true;
+        } else {
+                hw->fc.fc_was_autonegged = false;
+                hw->fc.current_mode = hw->fc.requested_mode;
         }
+        return ret_val;
+}
+
+/**
+ *  ixgbe_fc_autoneg_fiber - Enable flow control on 1 gig fiber
+ *  @hw: pointer to hardware structure
+ *
+ *  Enable flow control according on 1 gig fiber.
+ **/
+static s32 ixgbe_fc_autoneg_fiber(struct ixgbe_hw *hw)
+{
+        u32 pcs_anadv_reg, pcs_lpab_reg, linkstat;
+        s32 ret_val;
 
         /*
          * On multispeed fiber at 1g, bail out if
          * - link is up but AN did not complete, or if
          * - link is up and AN completed but timed out
          */
-        if (hw->phy.multispeed_fiber && (speed == IXGBE_LINK_SPEED_1GB_FULL)) {
-                linkstat = IXGBE_READ_REG(hw, IXGBE_PCS1GLSTA);
-                if (((linkstat & IXGBE_PCS1GLSTA_AN_COMPLETE) == 0) ||
-                    ((linkstat & IXGBE_PCS1GLSTA_AN_TIMED_OUT) == 1)) {
-                        hw->fc.fc_was_autonegged = false;
-                        hw->fc.current_mode = hw->fc.requested_mode;
-                        goto out;
-                }
+
+        linkstat = IXGBE_READ_REG(hw, IXGBE_PCS1GLSTA);
+        if (((linkstat & IXGBE_PCS1GLSTA_AN_COMPLETE) == 0) ||
+            ((linkstat & IXGBE_PCS1GLSTA_AN_TIMED_OUT) == 1)) {
+                ret_val = IXGBE_ERR_FC_NOT_NEGOTIATED;
+                goto out;
         }
 
+        pcs_anadv_reg = IXGBE_READ_REG(hw, IXGBE_PCS1GANA);
+        pcs_lpab_reg = IXGBE_READ_REG(hw, IXGBE_PCS1GANLP);
+
+        ret_val =  ixgbe_negotiate_fc(hw, pcs_anadv_reg,
+                               pcs_lpab_reg, IXGBE_PCS1GANA_SYM_PAUSE,
+                               IXGBE_PCS1GANA_ASM_PAUSE,
+                               IXGBE_PCS1GANA_SYM_PAUSE,
+                               IXGBE_PCS1GANA_ASM_PAUSE);
+
+out:
+        return ret_val;
+}
+
+/**
+ *  ixgbe_fc_autoneg_backplane - Enable flow control IEEE clause 37
+ *  @hw: pointer to hardware structure
+ *
+ *  Enable flow control according to IEEE clause 37.
+ **/
+static s32 ixgbe_fc_autoneg_backplane(struct ixgbe_hw *hw)
+{
+        u32 links2, anlp1_reg, autoc_reg, links;
+        s32 ret_val;
+
         /*
-         * Bail out on
-         * - copper or CX4 adapters
-         * - fiber adapters running at 10gig
+         * On backplane, bail out if
+         * - backplane autoneg was not completed, or if
+         * - we are 82599 and link partner is not AN enabled
          */
-        if ((hw->phy.media_type == ixgbe_media_type_copper) ||
-             (hw->phy.media_type == ixgbe_media_type_cx4) ||
-             ((hw->phy.media_type == ixgbe_media_type_fiber) &&
-             (speed == IXGBE_LINK_SPEED_10GB_FULL))) {
+        links = IXGBE_READ_REG(hw, IXGBE_LINKS);
+        if ((links & IXGBE_LINKS_KX_AN_COMP) == 0) {
                 hw->fc.fc_was_autonegged = false;
                 hw->fc.current_mode = hw->fc.requested_mode;
+                ret_val = IXGBE_ERR_FC_NOT_NEGOTIATED;
                 goto out;
         }
 
+        if (hw->mac.type == ixgbe_mac_82599EB) {
+                links2 = IXGBE_READ_REG(hw, IXGBE_LINKS2);
+                if ((links2 & IXGBE_LINKS2_AN_SUPPORTED) == 0) {
+                        hw->fc.fc_was_autonegged = false;
+                        hw->fc.current_mode = hw->fc.requested_mode;
+                        ret_val = IXGBE_ERR_FC_NOT_NEGOTIATED;
+                        goto out;
+                }
+        }
         /*
-         * Read the AN advertisement and LP ability registers and resolve
+         * Read the 10g AN autoc and LP ability registers and resolve
          * local flow control settings accordingly
          */
-        if ((speed == IXGBE_LINK_SPEED_1GB_FULL) &&
-            (hw->phy.media_type != ixgbe_media_type_backplane)) {
-                pcs_anadv_reg = IXGBE_READ_REG(hw, IXGBE_PCS1GANA);
-                pcs_lpab_reg = IXGBE_READ_REG(hw, IXGBE_PCS1GANLP);
-                if ((pcs_anadv_reg & IXGBE_PCS1GANA_SYM_PAUSE) &&
-                    (pcs_lpab_reg & IXGBE_PCS1GANA_SYM_PAUSE)) {
-                        /*
-                         * Now we need to check if the user selected Rx ONLY
-                         * of pause frames.  In this case, we had to advertise
-                         * FULL flow control because we could not advertise RX
-                         * ONLY. Hence, we must now check to see if we need to
-                         * turn OFF the TRANSMISSION of PAUSE frames.
-                         */
-                        if (hw->fc.requested_mode == ixgbe_fc_full) {
-                                hw->fc.current_mode = ixgbe_fc_full;
-                                hw_dbg(hw, "Flow Control = FULL.\n");
-                        } else {
-                                hw->fc.current_mode = ixgbe_fc_rx_pause;
-                                hw_dbg(hw, "Flow Control=RX PAUSE only\n");
-                        }
-                } else if (!(pcs_anadv_reg & IXGBE_PCS1GANA_SYM_PAUSE) &&
-                           (pcs_anadv_reg & IXGBE_PCS1GANA_ASM_PAUSE) &&
-                           (pcs_lpab_reg & IXGBE_PCS1GANA_SYM_PAUSE) &&
-                           (pcs_lpab_reg & IXGBE_PCS1GANA_ASM_PAUSE)) {
-                        hw->fc.current_mode = ixgbe_fc_tx_pause;
-                        hw_dbg(hw, "Flow Control = TX PAUSE frames only.\n");
-                } else if ((pcs_anadv_reg & IXGBE_PCS1GANA_SYM_PAUSE) &&
-                           (pcs_anadv_reg & IXGBE_PCS1GANA_ASM_PAUSE) &&
-                           !(pcs_lpab_reg & IXGBE_PCS1GANA_SYM_PAUSE) &&
-                           (pcs_lpab_reg & IXGBE_PCS1GANA_ASM_PAUSE)) {
-                        hw->fc.current_mode = ixgbe_fc_rx_pause;
-                        hw_dbg(hw, "Flow Control = RX PAUSE frames only.\n");
-                } else {
-                        hw->fc.current_mode = ixgbe_fc_none;
-                        hw_dbg(hw, "Flow Control = NONE.\n");
-                }
-        }
+        autoc_reg = IXGBE_READ_REG(hw, IXGBE_AUTOC);
+        anlp1_reg = IXGBE_READ_REG(hw, IXGBE_ANLP1);
 
-        if (hw->phy.media_type == ixgbe_media_type_backplane) {
+        ret_val = ixgbe_negotiate_fc(hw, autoc_reg,
+                anlp1_reg, IXGBE_AUTOC_SYM_PAUSE, IXGBE_AUTOC_ASM_PAUSE,
+                IXGBE_ANLP1_SYM_PAUSE, IXGBE_ANLP1_ASM_PAUSE);
+
+out:
+        return ret_val;
+}
+
+/**
+ *  ixgbe_fc_autoneg_copper - Enable flow control IEEE clause 37
+ *  @hw: pointer to hardware structure
+ *
+ *  Enable flow control according to IEEE clause 37.
+ **/
+static s32 ixgbe_fc_autoneg_copper(struct ixgbe_hw *hw)
+{
+        u16 technology_ability_reg = 0;
+        u16 lp_technology_ability_reg = 0;
+
+        hw->phy.ops.read_reg(hw, MDIO_AN_ADVERTISE,
+                             MDIO_MMD_AN,
+                             &technology_ability_reg);
+        hw->phy.ops.read_reg(hw, MDIO_AN_LPA,
+                             MDIO_MMD_AN,
+                             &lp_technology_ability_reg);
+
+        return ixgbe_negotiate_fc(hw, (u32)technology_ability_reg,
+                                  (u32)lp_technology_ability_reg,
+                                  IXGBE_TAF_SYM_PAUSE, IXGBE_TAF_ASM_PAUSE,
+                                  IXGBE_TAF_SYM_PAUSE, IXGBE_TAF_ASM_PAUSE);
+}
+
+/**
+ *  ixgbe_negotiate_fc - Negotiate flow control
+ *  @hw: pointer to hardware structure
+ *  @adv_reg: flow control advertised settings
+ *  @lp_reg: link partner's flow control settings
+ *  @adv_sym: symmetric pause bit in advertisement
+ *  @adv_asm: asymmetric pause bit in advertisement
+ *  @lp_sym: symmetric pause bit in link partner advertisement
+ *  @lp_asm: asymmetric pause bit in link partner advertisement
+ *
+ *  Find the intersection between advertised settings and link partner's
+ *  advertised settings
+ **/
+static s32 ixgbe_negotiate_fc(struct ixgbe_hw *hw, u32 adv_reg, u32 lp_reg,
+                              u32 adv_sym, u32 adv_asm, u32 lp_sym, u32 lp_asm)
+{
+        if ((!(adv_reg)) ||  (!(lp_reg)))
+                return IXGBE_ERR_FC_NOT_NEGOTIATED;
+
+        if ((adv_reg & adv_sym) && (lp_reg & lp_sym)) {
                 /*
-                 * Read the 10g AN autoc and LP ability registers and resolve
-                 * local flow control settings accordingly
+                 * Now we need to check if the user selected Rx ONLY
+                 * of pause frames.  In this case, we had to advertise
+                 * FULL flow control because we could not advertise RX
+                 * ONLY. Hence, we must now check to see if we need to
+                 * turn OFF the TRANSMISSION of PAUSE frames.
                  */
-                autoc_reg = IXGBE_READ_REG(hw, IXGBE_AUTOC);
-                anlp1_reg = IXGBE_READ_REG(hw, IXGBE_ANLP1);
-
-                if ((autoc_reg & IXGBE_AUTOC_SYM_PAUSE) &&
-                    (anlp1_reg & IXGBE_ANLP1_SYM_PAUSE)) {
-                        /*
-                         * Now we need to check if the user selected Rx ONLY
-                         * of pause frames.  In this case, we had to advertise
-                         * FULL flow control because we could not advertise RX
-                         * ONLY. Hence, we must now check to see if we need to
-                         * turn OFF the TRANSMISSION of PAUSE frames.
-                         */
-                        if (hw->fc.requested_mode == ixgbe_fc_full) {
-                                hw->fc.current_mode = ixgbe_fc_full;
-                                hw_dbg(hw, "Flow Control = FULL.\n");
-                        } else {
-                                hw->fc.current_mode = ixgbe_fc_rx_pause;
-                                hw_dbg(hw, "Flow Control=RX PAUSE only\n");
-                        }
-                } else if (!(autoc_reg & IXGBE_AUTOC_SYM_PAUSE) &&
-                           (autoc_reg & IXGBE_AUTOC_ASM_PAUSE) &&
-                           (anlp1_reg & IXGBE_ANLP1_SYM_PAUSE) &&
-                           (anlp1_reg & IXGBE_ANLP1_ASM_PAUSE)) {
-                        hw->fc.current_mode = ixgbe_fc_tx_pause;
-                        hw_dbg(hw, "Flow Control = TX PAUSE frames only.\n");
-                } else if ((autoc_reg & IXGBE_AUTOC_SYM_PAUSE) &&
-                           (autoc_reg & IXGBE_AUTOC_ASM_PAUSE) &&
-                           !(anlp1_reg & IXGBE_ANLP1_SYM_PAUSE) &&
-                           (anlp1_reg & IXGBE_ANLP1_ASM_PAUSE)) {
-                        hw->fc.current_mode = ixgbe_fc_rx_pause;
-                        hw_dbg(hw, "Flow Control = RX PAUSE frames only.\n");
+                if (hw->fc.requested_mode == ixgbe_fc_full) {
+                        hw->fc.current_mode = ixgbe_fc_full;
+                        hw_dbg(hw, "Flow Control = FULL.\n");
                 } else {
-                        hw->fc.current_mode = ixgbe_fc_none;
-                        hw_dbg(hw, "Flow Control = NONE.\n");
+                        hw->fc.current_mode = ixgbe_fc_rx_pause;
+                        hw_dbg(hw, "Flow Control=RX PAUSE frames only\n");
                 }
+        } else if (!(adv_reg & adv_sym) && (adv_reg & adv_asm) &&
+                   (lp_reg & lp_sym) && (lp_reg & lp_asm)) {
+                hw->fc.current_mode = ixgbe_fc_tx_pause;
+                hw_dbg(hw, "Flow Control = TX PAUSE frames only.\n");
+        } else if ((adv_reg & adv_sym) && (adv_reg & adv_asm) &&
+                   !(lp_reg & lp_sym) && (lp_reg & lp_asm)) {
+                hw->fc.current_mode = ixgbe_fc_rx_pause;
+                hw_dbg(hw, "Flow Control = RX PAUSE frames only.\n");
+        } else {
+                hw->fc.current_mode = ixgbe_fc_none;
+                hw_dbg(hw, "Flow Control = NONE.\n");
         }
-        /* Record that current_mode is the result of a successful autoneg */
-        hw->fc.fc_was_autonegged = true;
-
-out:
-        return ret_val;
+        return 0;
 }
 
 /**
@@ -1848,7 +1901,8 @@ out:
 static s32 ixgbe_setup_fc(struct ixgbe_hw *hw, s32 packetbuf_num)
 {
         s32 ret_val = 0;
-        u32 reg;
+        u32 reg = 0, reg_bp = 0;
+        u16 reg_cu = 0;
 
 #ifdef CONFIG_DCB
         if (hw->fc.requested_mode == ixgbe_fc_pfc) {
@@ -1856,7 +1910,7 @@ static s32 ixgbe_setup_fc(struct ixgbe_hw *hw, s32 packetbuf_num)
                 goto out;
         }
 
-#endif
+#endif /* CONFIG_DCB */
         /* Validate the packetbuf configuration */
         if (packetbuf_num < 0 || packetbuf_num > 7) {
                 hw_dbg(hw, "Invalid packet buffer number [%d], expected range "
@@ -1894,11 +1948,26 @@ static s32 ixgbe_setup_fc(struct ixgbe_hw *hw, s32 packetbuf_num)
                 hw->fc.requested_mode = ixgbe_fc_full;
 
         /*
-         * Set up the 1G flow control advertisement registers so the HW will be
-         * able to do fc autoneg once the cable is plugged in.  If we end up
-         * using 10g instead, this is harmless.
+         * Set up the 1G and 10G flow control advertisement registers so the
+         * HW will be able to do fc autoneg once the cable is plugged in.  If
+         * we link at 10G, the 1G advertisement is harmless and vice versa.
          */
-        reg = IXGBE_READ_REG(hw, IXGBE_PCS1GANA);
+
+        switch (hw->phy.media_type) {
+        case ixgbe_media_type_fiber:
+        case ixgbe_media_type_backplane:
+                reg = IXGBE_READ_REG(hw, IXGBE_PCS1GANA);
+                reg_bp = IXGBE_READ_REG(hw, IXGBE_AUTOC);
+                break;
+
+        case ixgbe_media_type_copper:
+                hw->phy.ops.read_reg(hw, MDIO_AN_ADVERTISE,
+                                        MDIO_MMD_AN, &reg_cu);
+                break;
+
+        default:
+                ;
+        }
 
         /*
          * The possible values of fc.requested_mode are:
@@ -1917,6 +1986,11 @@ static s32 ixgbe_setup_fc(struct ixgbe_hw *hw, s32 packetbuf_num)
         case ixgbe_fc_none:
                 /* Flow control completely disabled by software override. */
                 reg &= ~(IXGBE_PCS1GANA_SYM_PAUSE | IXGBE_PCS1GANA_ASM_PAUSE);
+                if (hw->phy.media_type == ixgbe_media_type_backplane)
+                        reg_bp &= ~(IXGBE_AUTOC_SYM_PAUSE |
+                                    IXGBE_AUTOC_ASM_PAUSE);
+                else if (hw->phy.media_type == ixgbe_media_type_copper)
+                        reg_cu &= ~(IXGBE_TAF_SYM_PAUSE | IXGBE_TAF_ASM_PAUSE);
                 break;
         case ixgbe_fc_rx_pause:
                 /*
@@ -1928,6 +2002,11 @@ static s32 ixgbe_setup_fc(struct ixgbe_hw *hw, s32 packetbuf_num)
                  * disable the adapter's ability to send PAUSE frames.
                  */
                 reg |= (IXGBE_PCS1GANA_SYM_PAUSE | IXGBE_PCS1GANA_ASM_PAUSE);
+                if (hw->phy.media_type == ixgbe_media_type_backplane)
+                        reg_bp |= (IXGBE_AUTOC_SYM_PAUSE |
+                                   IXGBE_AUTOC_ASM_PAUSE);
+                else if (hw->phy.media_type == ixgbe_media_type_copper)
+                        reg_cu |= (IXGBE_TAF_SYM_PAUSE | IXGBE_TAF_ASM_PAUSE);
                 break;
         case ixgbe_fc_tx_pause:
                 /*
@@ -1936,10 +2015,22 @@ static s32 ixgbe_setup_fc(struct ixgbe_hw *hw, s32 packetbuf_num)
                  */
                 reg |= (IXGBE_PCS1GANA_ASM_PAUSE);
                 reg &= ~(IXGBE_PCS1GANA_SYM_PAUSE);
+                if (hw->phy.media_type == ixgbe_media_type_backplane) {
+                        reg_bp |= (IXGBE_AUTOC_ASM_PAUSE);
+                        reg_bp &= ~(IXGBE_AUTOC_SYM_PAUSE);
+                } else if (hw->phy.media_type == ixgbe_media_type_copper) {
+                        reg_cu |= (IXGBE_TAF_ASM_PAUSE);
+                        reg_cu &= ~(IXGBE_TAF_SYM_PAUSE);
+                }
                 break;
         case ixgbe_fc_full:
                 /* Flow control (both Rx and Tx) is enabled by SW override. */
                 reg |= (IXGBE_PCS1GANA_SYM_PAUSE | IXGBE_PCS1GANA_ASM_PAUSE);
+                if (hw->phy.media_type == ixgbe_media_type_backplane)
+                        reg_bp |= (IXGBE_AUTOC_SYM_PAUSE |
+                                   IXGBE_AUTOC_ASM_PAUSE);
+                else if (hw->phy.media_type == ixgbe_media_type_copper)
+                        reg_cu |= (IXGBE_TAF_SYM_PAUSE | IXGBE_TAF_ASM_PAUSE);
                 break;
 #ifdef CONFIG_DCB
         case ixgbe_fc_pfc:
@@ -1953,80 +2044,37 @@ static s32 ixgbe_setup_fc(struct ixgbe_hw *hw, s32 packetbuf_num)
                 break;
         }
 
-        IXGBE_WRITE_REG(hw, IXGBE_PCS1GANA, reg);
-        reg = IXGBE_READ_REG(hw, IXGBE_PCS1GLCTL);
-
-        /* Disable AN timeout */
-        if (hw->fc.strict_ieee)
-                reg &= ~IXGBE_PCS1GLCTL_AN_1G_TIMEOUT_EN;
+        if (hw->mac.type != ixgbe_mac_X540) {
+                /*
+                 * Enable auto-negotiation between the MAC & PHY;
+                 * the MAC will advertise clause 37 flow control.
+                 */
+                IXGBE_WRITE_REG(hw, IXGBE_PCS1GANA, reg);
+                reg = IXGBE_READ_REG(hw, IXGBE_PCS1GLCTL);
 
-        IXGBE_WRITE_REG(hw, IXGBE_PCS1GLCTL, reg);
-        hw_dbg(hw, "Set up FC; PCS1GLCTL = 0x%08X\n", reg);
+                /* Disable AN timeout */
+                if (hw->fc.strict_ieee)
+                        reg &= ~IXGBE_PCS1GLCTL_AN_1G_TIMEOUT_EN;
 
-        /*
-         * Set up the 10G flow control advertisement registers so the HW
-         * can do fc autoneg once the cable is plugged in.  If we end up
-         * using 1g instead, this is harmless.
-         */
-        reg = IXGBE_READ_REG(hw, IXGBE_AUTOC);
+                IXGBE_WRITE_REG(hw, IXGBE_PCS1GLCTL, reg);
+                hw_dbg(hw, "Set up FC; PCS1GLCTL = 0x%08X\n", reg);
+        }
 
         /*
-         * The possible values of fc.requested_mode are:
-         * 0: Flow control is completely disabled
-         * 1: Rx flow control is enabled (we can receive pause frames,
-         *    but not send pause frames).
-         * 2: Tx flow control is enabled (we can send pause frames but
-         *    we do not support receiving pause frames).
-         * 3: Both Rx and Tx flow control (symmetric) are enabled.
-         * other: Invalid.
+         * AUTOC restart handles negotiation of 1G and 10G on backplane
+         * and copper. There is no need to set the PCS1GCTL register.
+         *
          */
-        switch (hw->fc.requested_mode) {
-        case ixgbe_fc_none:
-                /* Flow control completely disabled by software override. */
-                reg &= ~(IXGBE_AUTOC_SYM_PAUSE | IXGBE_AUTOC_ASM_PAUSE);
-                break;
-        case ixgbe_fc_rx_pause:
-                /*
-                 * Rx Flow control is enabled and Tx Flow control is
-                 * disabled by software override. Since there really
-                 * isn't a way to advertise that we are capable of RX
-                 * Pause ONLY, we will advertise that we support both
-                 * symmetric and asymmetric Rx PAUSE.  Later, we will
-                 * disable the adapter's ability to send PAUSE frames.
-                 */
-                reg |= (IXGBE_AUTOC_SYM_PAUSE | IXGBE_AUTOC_ASM_PAUSE);
-                break;
-        case ixgbe_fc_tx_pause:
-                /*
-                 * Tx Flow control is enabled, and Rx Flow control is
-                 * disabled by software override.
-                 */
-                reg |= (IXGBE_AUTOC_ASM_PAUSE);
-                reg &= ~(IXGBE_AUTOC_SYM_PAUSE);
-                break;
-        case ixgbe_fc_full:
-                /* Flow control (both Rx and Tx) is enabled by SW override. */
-                reg |= (IXGBE_AUTOC_SYM_PAUSE | IXGBE_AUTOC_ASM_PAUSE);
-                break;
-#ifdef CONFIG_DCB
-        case ixgbe_fc_pfc:
-                goto out;
-                break;
-#endif /* CONFIG_DCB */
-        default:
-                hw_dbg(hw, "Flow control param set incorrectly\n");
-                ret_val = IXGBE_ERR_CONFIG;
-                goto out;
-                break;
+        if (hw->phy.media_type == ixgbe_media_type_backplane) {
+                reg_bp |= IXGBE_AUTOC_AN_RESTART;
+                IXGBE_WRITE_REG(hw, IXGBE_AUTOC, reg_bp);
+        } else if ((hw->phy.media_type == ixgbe_media_type_copper) &&
+                    (ixgbe_device_supports_autoneg_fc(hw) == 0)) {
+                hw->phy.ops.write_reg(hw, MDIO_AN_ADVERTISE,
+                                      MDIO_MMD_AN, reg_cu);
         }
-        /*
-         * AUTOC restart handles negotiation of 1G and 10G. There is
-         * no need to set the PCS1GCTL register.
-         */
-        reg |= IXGBE_AUTOC_AN_RESTART;
-        IXGBE_WRITE_REG(hw, IXGBE_AUTOC, reg);
-        hw_dbg(hw, "Set up FC; IXGBE_AUTOC = 0x%08X\n", reg);
 
+        hw_dbg(hw, "Set up FC; IXGBE_AUTOC = 0x%08X\n", reg);
 out:
         return ret_val;
 }
@@ -2751,6 +2799,28 @@ wwn_prefix_out:
 }
 
 /**
+ *  ixgbe_device_supports_autoneg_fc - Check if phy supports autoneg flow
+ *  control
+ *  @hw: pointer to hardware structure
+ *
+ *  There are several phys that do not support autoneg flow control. This
+ *  function check the device id to see if the associated phy supports
+ *  autoneg flow control.
+ **/
+static s32 ixgbe_device_supports_autoneg_fc(struct ixgbe_hw *hw)
+{
+
+        switch (hw->device_id) {
+        case IXGBE_DEV_ID_X540T:
+                return 0;
+        case IXGBE_DEV_ID_82599_T3_LOM:
+                return 0;
+        default:
+                return IXGBE_ERR_FC_NOT_SUPPORTED;
+        }
+}
+
+/**
  *  ixgbe_set_mac_anti_spoofing - Enable/Disable MAC anti-spoofing
  *  @hw: pointer to hardware structure
  *  @enable: enable or disable switch for anti-spoofing
diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index 5e8c39decca1..5998dc94dd5c 100644
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -3775,7 +3775,8 @@ static int ixgbe_non_sfp_link_config(struct ixgbe_hw *hw)
         if (ret)
                 goto link_cfg_out;
 
-        if (hw->mac.ops.get_link_capabilities)
+        autoneg = hw->phy.autoneg_advertised;
+        if ((!autoneg) && (hw->mac.ops.get_link_capabilities))
                 ret = hw->mac.ops.get_link_capabilities(hw, &autoneg,
                                                         &negotiation);
         if (ret)
diff --git a/drivers/net/ixgbe/ixgbe_phy.h b/drivers/net/ixgbe/ixgbe_phy.h
index 2327baf04426..9bf2783d7a74 100644
--- a/drivers/net/ixgbe/ixgbe_phy.h
+++ b/drivers/net/ixgbe/ixgbe_phy.h
@@ -58,6 +58,10 @@
 #define IXGBE_I2C_EEPROM_STATUS_FAIL         0x2
 #define IXGBE_I2C_EEPROM_STATUS_IN_PROGRESS  0x3
 
+/* Flow control defines */
+#define IXGBE_TAF_SYM_PAUSE                  0x400
+#define IXGBE_TAF_ASM_PAUSE                  0x800
+
 /* Bit-shift macros */
 #define IXGBE_SFF_VENDOR_OUI_BYTE0_SHIFT    24
 #define IXGBE_SFF_VENDOR_OUI_BYTE1_SHIFT    16
diff --git a/drivers/net/ixgbe/ixgbe_type.h b/drivers/net/ixgbe/ixgbe_type.h
index 76bf21b8a10d..f190a4a8faf4 100644
--- a/drivers/net/ixgbe/ixgbe_type.h
+++ b/drivers/net/ixgbe/ixgbe_type.h
@@ -2698,6 +2698,9 @@ struct ixgbe_info {
 #define IXGBE_ERR_EEPROM_VERSION                -24
 #define IXGBE_ERR_NO_SPACE                      -25
 #define IXGBE_ERR_OVERTEMP                      -26
+#define IXGBE_ERR_FC_NOT_NEGOTIATED             -27
+#define IXGBE_ERR_FC_NOT_SUPPORTED              -28
+#define IXGBE_ERR_FLOW_CONTROL                  -29
 #define IXGBE_ERR_SFP_SETUP_NOT_COMPLETE        -30
 #define IXGBE_ERR_PBA_SECTION                   -31
 #define IXGBE_ERR_INVALID_ARGUMENT              -32