From d3f3d4134eb700ad087691effbdf26fe8f3bfd90 Mon Sep 17 00:00:00 2001 From: Brian King Date: Fri, 15 Dec 2017 15:21:50 -0600 Subject: [PATCH] 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 Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/broadcom/tg3.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c index 656e6af70f0a..aef3fcf2f5b9 100644 --- a/drivers/net/ethernet/broadcom/tg3.c +++ b/drivers/net/ethernet/broadcom/tg3.c @@ -14227,7 +14227,9 @@ 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); -- 2.20.1