netvsc: reduce maximum GSO size (a50af86d) · Commits · 戴 / test

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>

drivers/net/hyperv/netvsc_drv.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -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) {

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