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netvsc: reduce maximum GSO size

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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>
This commit is contained in:
stephen hemminger 2016-12-06 13:43:54 -08:00 committed by David S. Miller
parent 74685b08fb
commit a50af86dd4
1 changed files with 5 additions and 0 deletions
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5
drivers/net/hyperv/netvsc_drv.c
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@ -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) {