nsh: add GSO support (c411ed85) · Commits · 戴 / test

net/Kconfig

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -235,6 +235,7 @@ source "net/openvswitch/Kconfig"
	source "net/vmw_vsock/Kconfig"		source "net/vmw_vsock/Kconfig"
	source "net/netlink/Kconfig"		source "net/netlink/Kconfig"
	source "net/mpls/Kconfig"		source "net/mpls/Kconfig"
			source "net/nsh/Kconfig"
	source "net/hsr/Kconfig"		source "net/hsr/Kconfig"
	source "net/switchdev/Kconfig"		source "net/switchdev/Kconfig"
	source "net/l3mdev/Kconfig"		source "net/l3mdev/Kconfig"

net/Makefile

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -75,6 +75,7 @@ obj-$(CONFIG_NET_IFE) += ife/
	obj-$(CONFIG_OPENVSWITCH) += openvswitch/		obj-$(CONFIG_OPENVSWITCH) += openvswitch/
	obj-$(CONFIG_VSOCKETS) += vmw_vsock/		obj-$(CONFIG_VSOCKETS) += vmw_vsock/
	obj-$(CONFIG_MPLS) += mpls/		obj-$(CONFIG_MPLS) += mpls/
			obj-$(CONFIG_NET_NSH) += nsh/
	obj-$(CONFIG_HSR) += hsr/		obj-$(CONFIG_HSR) += hsr/
	ifneq ($(CONFIG_NET_SWITCHDEV),)		ifneq ($(CONFIG_NET_SWITCHDEV),)
	obj-y += switchdev/		obj-y += switchdev/

net/nsh/Kconfig

0 → 100644

+9 −0

Original line number	Original line	Diff line number	Diff line
			menuconfig NET_NSH
			tristate "Network Service Header (NSH) protocol"
			default n
			---help---
			Network Service Header is an implementation of Service Function
			Chaining (RFC 7665). The current implementation in Linux supports
			only MD type 1 and only with the openvswitch module.

			If unsure, say N.

net/nsh/Makefile

0 → 100644

+1 −0

Original line number	Original line	Diff line number	Diff line
			obj-$(CONFIG_NET_NSH) += nsh.o

net/nsh/nsh.c

0 → 100644

+91 −0

Original line number	Original line	Diff line number	Diff line
			/*
			* Network Service Header
			*
			* Copyright (c) 2017 Red Hat, Inc. -- Jiri Benc <jbenc@redhat.com>
			*
			* This program is free software; you can redistribute it and/or modify
			* it under the terms of the GNU General Public License version 2 as
			* published by the Free Software Foundation.
			*/

			#include <linux/module.h>
			#include <linux/netdevice.h>
			#include <linux/skbuff.h>
			#include <net/nsh.h>
			#include <net/tun_proto.h>

			static struct sk_buff nsh_gso_segment(struct sk_buff skb,
			netdev_features_t features)
			{
			struct sk_buff *segs = ERR_PTR(-EINVAL);
			unsigned int nsh_len, mac_len;
			__be16 proto;
			int nhoff;

			skb_reset_network_header(skb);

			nhoff = skb->network_header - skb->mac_header;
			mac_len = skb->mac_len;

			if (unlikely(!pskb_may_pull(skb, NSH_BASE_HDR_LEN)))
			goto out;
			nsh_len = nsh_hdr_len(nsh_hdr(skb));
			if (unlikely(!pskb_may_pull(skb, nsh_len)))
			goto out;

			proto = tun_p_to_eth_p(nsh_hdr(skb)->np);
			if (!proto)
			goto out;

			__skb_pull(skb, nsh_len);

			skb_reset_mac_header(skb);
			skb_reset_mac_len(skb);
			skb->protocol = proto;

			features &= NETIF_F_SG;
			segs = skb_mac_gso_segment(skb, features);
			if (IS_ERR_OR_NULL(segs)) {
			skb_gso_error_unwind(skb, htons(ETH_P_NSH), nsh_len,
			skb->network_header - nhoff,
			mac_len);
			goto out;
			}

			for (skb = segs; skb; skb = skb->next) {
			skb->protocol = htons(ETH_P_NSH);
			__skb_push(skb, nsh_len);
			skb_set_mac_header(skb, -nhoff);
			skb->network_header = skb->mac_header + mac_len;
			skb->mac_len = mac_len;
			}

			out:
			return segs;
			}

			static struct packet_offload nsh_packet_offload __read_mostly = {
			.type = htons(ETH_P_NSH),
			.priority = 15,
			.callbacks = {
			.gso_segment = nsh_gso_segment,
			},
			};

			static int __init nsh_init_module(void)
			{
			dev_add_offload(&nsh_packet_offload);
			return 0;
			}

			static void __exit nsh_cleanup_module(void)
			{
			dev_remove_offload(&nsh_packet_offload);
			}

			module_init(nsh_init_module);
			module_exit(nsh_cleanup_module);

			MODULE_AUTHOR("Jiri Benc <jbenc@redhat.com>");
			MODULE_DESCRIPTION("NSH protocol");
			MODULE_LICENSE("GPL v2");

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