This is a note to let you know that I've just added the patch titled
netvsc: reduce maximum GSO size
to the 4.4-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:
netvsc-reduce-maximum-gso-size.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@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Thu Jan 12 21:36:14 CET 2017
From: stephen hemminger <stephen@xxxxxxxxxxxxxxxxxx>
Date: Tue, 6 Dec 2016 13:43:54 -0800
Subject: netvsc: reduce maximum GSO size
From: stephen hemminger <stephen@xxxxxxxxxxxxxxxxxx>
[ Upstream commit a50af86dd49ee1851d1ccf06dd0019c05b95e297 ]
Hyper-V (and Azure) support using NVGRE which requires some extra space
for encapsulation headers. Because of this the largest allowed TSO
packet is reduced.
For older releases, hard code a fixed reduced value. For next release,
there is a better solution which uses result of host offload
negotiation.
Signed-off-by: Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/hyperv/netvsc_drv.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -40,6 +40,8 @@
#include "hyperv_net.h"
+/* Restrict GSO size to account for NVGRE */
+#define NETVSC_GSO_MAX_SIZE 62768
#define RING_SIZE_MIN 64
static int ring_size = 128;
@@ -852,6 +854,7 @@ static int netvsc_set_channels(struct ne
}
goto recover;
}
+ netif_set_gso_max_size(net, NETVSC_GSO_MAX_SIZE);
out:
netvsc_open(net);
Patches currently in stable-queue which might be from stephen@xxxxxxxxxxxxxxxxxx are
queue-4.4/netvsc-reduce-maximum-gso-size.patch
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