D27917.id81540.diff
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D27917.id81540.diff
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	Index: sys/dev/virtio/network/if_vtnet.c
	===================================================================
	--- sys/dev/virtio/network/if_vtnet.c
	+++ sys/dev/virtio/network/if_vtnet.c
	@@ -289,6 +289,11 @@
	SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_max_pairs, CTLFLAG_RDTUN,
	&vtnet_mq_max_pairs, 0, "Sets the maximum number of multiqueue pairs");

	+static int vtnet_tso_maxlen = IP_MAXPACKET;
	+TUNABLE_INT("hw.vtnet.tso_maxlen", &vtnet_tso_maxlen);
	+SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_maxlen, CTLFLAG_RDTUN,
	+ &vtnet_tso_maxlen, 0, "TSO burst limit");
	+
	static int vtnet_rx_process_limit = 512;
	TUNABLE_INT("hw.vtnet.rx_process_limit", &vtnet_rx_process_limit);
	SYSCTL_INT(_hw_vtnet, OID_AUTO, rx_process_limit, CTLFLAG_RDTUN,
	@@ -1039,8 +1044,18 @@
	if (gso \|\| virtio_with_feature(dev, VIRTIO_NET_F_HOST_ECN))
	sc->vtnet_flags \|= VTNET_FLAG_TSO_ECN;

	- if (ifp->if_capabilities & (IFCAP_TSO4 \| IFCAP_TSO6))
	+ if (ifp->if_capabilities & (IFCAP_TSO4 \| IFCAP_TSO6)) {
	+ int tso_maxlen;
	+
	ifp->if_capabilities \|= IFCAP_VLAN_HWTSO;
	+
	+ tso_maxlen = vtnet_tunable_int(sc, "tso_maxlen",
	+ vtnet_tso_maxlen);
	+ ifp->if_hw_tsomax = tso_maxlen -
	+ (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN);
	+ ifp->if_hw_tsomaxsegcount = sc->vtnet_tx_nsegs - 1;
	+ ifp->if_hw_tsomaxsegsize = PAGE_SIZE;
	+ }
	}

	if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_CSUM)) {