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

[Siva Reddy Kallam]

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

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>
---
 drivers/net/ethernet/broadcom/tg3.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/tg3.c 
b/drivers/net/ethernet/broadcom/tg3.c
index 8929530..432c3b8 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -12422,6 +12422,7 @@ static int tg3_set_ringparam(struct net_device *dev, 
struct ethtool_ringparam *e
 {
        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) ||
@@ -12453,7 +12454,13 @@ static int tg3_set_ringparam(struct net_device *dev, 
struct ethtool_ringparam *e
 
        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);
        }
@@ -12487,6 +12494,7 @@ static int tg3_set_pauseparam(struct net_device *dev, 
struct ethtool_pauseparam
 {
        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);
@@ -12556,7 +12564,13 @@ static int tg3_set_pauseparam(struct net_device *dev, 
struct ethtool_pauseparam
 
                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);
                }
-- 
1.8.3.1