]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blame - net/mpls/mpls_gso.c
KVM: SVM: Move spec control call after restore of GS
[mirror_ubuntu-artful-kernel.git] / net / mpls / mpls_gso.c
CommitLineData
0d89d203
SH
1/*
2 * MPLS GSO Support
3 *
4 * Authors: Simon Horman (horms@verge.net.au)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 * Based on: GSO portions of net/ipv4/gre.c
12 */
13
14#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15
16#include <linux/err.h>
17#include <linux/module.h>
18#include <linux/netdev_features.h>
19#include <linux/netdevice.h>
20#include <linux/skbuff.h>
21
22static struct sk_buff *mpls_gso_segment(struct sk_buff *skb,
23 netdev_features_t features)
24{
25 struct sk_buff *segs = ERR_PTR(-EINVAL);
48d2ab60 26 u16 mac_offset = skb->mac_header;
0d89d203 27 netdev_features_t mpls_features;
48d2ab60 28 u16 mac_len = skb->mac_len;
0d89d203 29 __be16 mpls_protocol;
48d2ab60
DA
30 unsigned int mpls_hlen;
31
32 skb_reset_network_header(skb);
33 mpls_hlen = skb_inner_network_header(skb) - skb_network_header(skb);
34 if (unlikely(!pskb_may_pull(skb, mpls_hlen)))
35 goto out;
0d89d203 36
0d89d203
SH
37 /* Setup inner SKB. */
38 mpls_protocol = skb->protocol;
39 skb->protocol = skb->inner_protocol;
40
48d2ab60
DA
41 __skb_pull(skb, mpls_hlen);
42
43 skb->mac_len = 0;
44 skb_reset_mac_header(skb);
0d89d203
SH
45
46 /* Segment inner packet. */
1e16aa3d 47 mpls_features = skb->dev->mpls_features & features;
0d89d203 48 segs = skb_mac_gso_segment(skb, mpls_features);
48d2ab60
DA
49 if (IS_ERR_OR_NULL(segs)) {
50 skb_gso_error_unwind(skb, mpls_protocol, mpls_hlen, mac_offset,
51 mac_len);
52 goto out;
53 }
54 skb = segs;
55
56 mpls_hlen += mac_len;
57 do {
58 skb->mac_len = mac_len;
59 skb->protocol = mpls_protocol;
0d89d203 60
48d2ab60 61 skb_reset_inner_network_header(skb);
0d89d203 62
48d2ab60 63 __skb_push(skb, mpls_hlen);
0d89d203 64
48d2ab60
DA
65 skb_reset_mac_header(skb);
66 skb_set_network_header(skb, mac_len);
67 } while ((skb = skb->next));
5c7cdf33 68
48d2ab60 69out:
0d89d203
SH
70 return segs;
71}
72
207895fd 73static struct packet_offload mpls_mc_offload __read_mostly = {
0d89d203 74 .type = cpu_to_be16(ETH_P_MPLS_MC),
bdef7de4 75 .priority = 15,
0d89d203 76 .callbacks = {
0d89d203
SH
77 .gso_segment = mpls_gso_segment,
78 },
79};
80
207895fd 81static struct packet_offload mpls_uc_offload __read_mostly = {
0d89d203 82 .type = cpu_to_be16(ETH_P_MPLS_UC),
bdef7de4 83 .priority = 15,
0d89d203 84 .callbacks = {
0d89d203
SH
85 .gso_segment = mpls_gso_segment,
86 },
87};
88
89static int __init mpls_gso_init(void)
90{
91 pr_info("MPLS GSO support\n");
92
93 dev_add_offload(&mpls_uc_offload);
94 dev_add_offload(&mpls_mc_offload);
95
96 return 0;
97}
98
99static void __exit mpls_gso_exit(void)
100{
101 dev_remove_offload(&mpls_uc_offload);
102 dev_remove_offload(&mpls_mc_offload);
103}
104
105module_init(mpls_gso_init);
106module_exit(mpls_gso_exit);
107
108MODULE_DESCRIPTION("MPLS GSO support");
109MODULE_AUTHOR("Simon Horman (horms@verge.net.au)");
110MODULE_LICENSE("GPL");