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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>
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@ -47,6 +47,10 @@
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NETIF_F_TSO | \
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NETIF_F_TSO6 | \
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NETIF_F_HW_CSUM)
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/* Restrict GSO size to account for NVGRE */
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#define NETVSC_GSO_MAX_SIZE 62768
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static int ring_size = 128;
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module_param(ring_size, int, S_IRUGO);
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MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)");
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@ -1400,6 +1404,7 @@ static int netvsc_probe(struct hv_device *dev,
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nvdev = net_device_ctx->nvdev;
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netif_set_real_num_tx_queues(net, nvdev->num_chn);
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netif_set_real_num_rx_queues(net, nvdev->num_chn);
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netif_set_gso_max_size(net, NETVSC_GSO_MAX_SIZE);
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ret = register_netdev(net);
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if (ret != 0) {
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