4.4-stable review patch. If anyone has any objections, please let me know.
------------------ From: stephen hemminger <[email protected]> [ 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 <[email protected]> Signed-off-by: David S. Miller <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- 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);
