diff options
| author | stephen hemminger <stephen@networkplumber.org> | 2016-12-06 13:43:54 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-12-07 13:13:41 -0500 |
| commit | a50af86dd49ee1851d1ccf06dd0019c05b95e297 (patch) | |
| tree | 257945e0bd44a7b985f0bd5f76a96c5db4debbff /drivers | |
| parent | 74685b08fbb26ff5b8448fabe0941a53269dd33e (diff) | |
| download | linux-a50af86dd49ee1851d1ccf06dd0019c05b95e297.tar.bz2 | |
netvsc: reduce maximum GSO size
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@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/hyperv/netvsc_drv.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c index f6382150b16a..c9140c3aeb67 100644 --- a/drivers/net/hyperv/netvsc_drv.c +++ b/drivers/net/hyperv/netvsc_drv.c @@ -47,6 +47,10 @@ NETIF_F_TSO | \ NETIF_F_TSO6 | \ NETIF_F_HW_CSUM) + +/* Restrict GSO size to account for NVGRE */ +#define NETVSC_GSO_MAX_SIZE 62768 + static int ring_size = 128; module_param(ring_size, int, S_IRUGO); MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)"); @@ -1400,6 +1404,7 @@ static int netvsc_probe(struct hv_device *dev, nvdev = net_device_ctx->nvdev; netif_set_real_num_tx_queues(net, nvdev->num_chn); netif_set_real_num_rx_queues(net, nvdev->num_chn); + netif_set_gso_max_size(net, NETVSC_GSO_MAX_SIZE); ret = register_netdev(net); if (ret != 0) { |