[PATCH 4.9 06/59] tg3: Add PHY reset for 5717/5719/5720 in change ring and flow control paths

[Greg Kroah-Hartman]

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Siva Reddy Kallam <siva.kal...@broadcom.com>

[ Upstream commit 59663e42199c93d1d7314d1446f6782fc4b1eb81 ]

This patch has the fix to avoid PHY lockup with 5717/5719/5720 in change
ring and flow control paths. This patch solves the RX hang while doing
continuous ring or flow control parameters with heavy traffic from peer.

Signed-off-by: Siva Reddy Kallam <siva.kal...@broadcom.com>
Acked-by: Michael Chan <michael.c...@broadcom.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/net/ethernet/broadcom/tg3.c |   18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -12389,6 +12389,7 @@ static int tg3_set_ringparam(struct net_
 {
        struct tg3 *tp = netdev_priv(dev);
        int i, irq_sync = 0, err = 0;
+       bool reset_phy = false;
 
        if ((ering->rx_pending > tp->rx_std_ring_mask) ||
            (ering->rx_jumbo_pending > tp->rx_jmb_ring_mask) ||
@@ -12420,7 +12421,13 @@ static int tg3_set_ringparam(struct net_
 
        if (netif_running(dev)) {
                tg3_halt(tp, RESET_KIND_SHUTDOWN, 1);
-               err = tg3_restart_hw(tp, false);
+               /* Reset PHY to avoid PHY lock up */
+               if (tg3_asic_rev(tp) == ASIC_REV_5717 ||
+                   tg3_asic_rev(tp) == ASIC_REV_5719 ||
+                   tg3_asic_rev(tp) == ASIC_REV_5720)
+                       reset_phy = true;
+
+               err = tg3_restart_hw(tp, reset_phy);
                if (!err)
                        tg3_netif_start(tp);
        }
@@ -12454,6 +12461,7 @@ static int tg3_set_pauseparam(struct net
 {
        struct tg3 *tp = netdev_priv(dev);
        int err = 0;
+       bool reset_phy = false;
 
        if (tp->link_config.autoneg == AUTONEG_ENABLE)
                tg3_warn_mgmt_link_flap(tp);
@@ -12544,7 +12552,13 @@ static int tg3_set_pauseparam(struct net
 
                if (netif_running(dev)) {
                        tg3_halt(tp, RESET_KIND_SHUTDOWN, 1);
-                       err = tg3_restart_hw(tp, false);
+                       /* Reset PHY to avoid PHY lock up */
+                       if (tg3_asic_rev(tp) == ASIC_REV_5717 ||
+                           tg3_asic_rev(tp) == ASIC_REV_5719 ||
+                           tg3_asic_rev(tp) == ASIC_REV_5720)
+                               reset_phy = true;
+
+                       err = tg3_restart_hw(tp, reset_phy);
                        if (!err)
                                tg3_netif_start(tp);
                }