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 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

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-4.4 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 11:20:35 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 @@ -14228,7 +14228,9 @@ 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-4.4/tg3-fix-rx-hang-on-mtu-change-with-5717-5719.patch