From: stephen hemminger <stephen@xxxxxxxxxxxxxxxxxx>
This patch has been added to the 3.12 stable tree. If you have any
objections, please let us know.
===============
[ 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: Jiri Slaby <jslaby@xxxxxxx>
---
drivers/net/hyperv/netvsc_drv.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 616b4e1dd44c..eb6d0d8a3e06 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -48,6 +48,9 @@ struct net_device_context {
struct work_struct work;
};
+/* Restrict GSO size to account for NVGRE */
+#define NETVSC_GSO_MAX_SIZE 62768
+
#define RING_SIZE_MIN 64
static int ring_size = 128;
module_param(ring_size, int, S_IRUGO);
@@ -435,6 +438,7 @@ static int netvsc_probe(struct hv_device *dev,
SET_ETHTOOL_OPS(net, ðtool_ops);
SET_NETDEV_DEV(net, &dev->device);
+ netif_set_gso_max_size(net, NETVSC_GSO_MAX_SIZE);
ret = register_netdev(net);
if (ret != 0) {
--
2.11.0
--
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