Patch "tg3: Fix rx hang on MTU change with 5717/5719" has been added to the 3.18-stable tree

Patch "tg3: Fix rx hang on MTU change with 5717/5719" has been added to the 3.18-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

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

to the 3.18-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     tg3-fix-rx-hang-on-mtu-change-with-5717-5719.patch
and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Sun Dec 31 11:31:10 CET 2017
From: Brian King <brking@linux.vnet.ibm.com>
Date: Fri, 15 Dec 2017 15:21:50 -0600
Subject: tg3: Fix rx hang on MTU change with 5717/5719

From: Brian King <brking@linux.vnet.ibm.com>


[ 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>
---
 drivers/net/ethernet/broadcom/tg3.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -14202,7 +14202,9 @@ static int tg3_change_mtu(struct net_dev
 	/* 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);


Patches currently in stable-queue which might be from brking@linux.vnet.ibm.com are

queue-3.18/tg3-fix-rx-hang-on-mtu-change-with-5717-5719.patch