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| author | stephen hemminger <stephen@networkplumber.org> | 2016-12-07 00:43:54 +0300 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2017-01-26 19:40:22 +0300 |
| commit | fa5e29d5d65fd6eb4616125410f144e7dae26707 (patch) | |
| tree | 7106b3a14c439f17026e7a5310e89a5f96cd42f2 /drivers | |
| parent | 6e89266fa6eedba557c0a602acb4f60ff5a1543c (diff) | |
| download | linux-fa5e29d5d65fd6eb4616125410f144e7dae26707.tar.xz | |
netvsc: reduce maximum GSO size
[ 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@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/hyperv/netvsc_drv.c | 4 |
1 files changed, 4 insertions, 0 deletions
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) { |