tg3: Fix rx hang on MTU change with 5717/5719

[ Upstream commit 748a240c589824e9121befb1cba5341c319885bc ]

This fixes a hang issue seen when changing the MTU size from 1500 MTU
to 9000 MTU on both 5717 and 5719 chips. In discussion with Broadcom,
they've indicated that these chipsets have the same phy as the 57766
chipset, so the same workarounds apply. This has been tested by IBM
on both Power 8 and Power 9 systems as well as by Broadcom on x86
hardware and has been confirmed to resolve the hang issue.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index edae2dcc4927ebe7024f349060ba5728aa6412c7..bb22d325e9656c50630df4829d7ab9f1b37a25c8 100644 (file)
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -14226,7 +14226,9 @@ static int tg3_change_mtu(struct net_device *dev, int new_mtu)
        /* Reset PHY, otherwise the read DMA engine will be in a mode that
         * breaks all requests to 256 bytes.
         */
-       if (tg3_asic_rev(tp) == ASIC_REV_57766)
+       if (tg3_asic_rev(tp) == ASIC_REV_57766 ||
+           tg3_asic_rev(tp) == ASIC_REV_5717 ||
+           tg3_asic_rev(tp) == ASIC_REV_5719)
                reset_phy = true;
 
        err = tg3_restart_hw(tp, reset_phy);