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Subject[PATCH 4.4 04/70] tg3: Add PHY reset for 5717/5719/5720 in change ring and flow control paths
Date
4.4-stable review patch.  If anyone has any objections, please let me know.

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

From: Siva Reddy Kallam <siva.kallam@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.kallam@broadcom.com>
Acked-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@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
@@ -12379,6 +12379,7 @@ 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) ||
@@ -12410,7 +12411,13 @@ 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);
}
@@ -12444,6 +12451,7 @@ 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);
@@ -12534,7 +12542,13 @@ 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);
}

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