e75a2f3b10af7721610af6adf0c42e5c7fec2192
[linux-2.6.git] / net / 8021q / vlan_core.c
1 #include <linux/skbuff.h>
2 #include <linux/netdevice.h>
3 #include <linux/if_vlan.h>
4 #include <linux/netpoll.h>
5 #include "vlan.h"
6
7 /* VLAN rx hw acceleration helper.  This acts like netif_{rx,receive_skb}(). */
8 int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
9                       u16 vlan_tci, int polling)
10 {
11         if (netpoll_rx(skb))
12                 return NET_RX_DROP;
13
14         if (skb_bond_should_drop(skb))
15                 goto drop;
16
17         __vlan_hwaccel_put_tag(skb, vlan_tci);
18         skb->dev = vlan_group_get_device(grp, vlan_tci & VLAN_VID_MASK);
19
20         if (!skb->dev)
21                 goto drop;
22
23         return (polling ? netif_receive_skb(skb) : netif_rx(skb));
24
25 drop:
26         dev_kfree_skb_any(skb);
27         return NET_RX_DROP;
28 }
29 EXPORT_SYMBOL(__vlan_hwaccel_rx);
30
31 int vlan_hwaccel_do_receive(struct sk_buff *skb)
32 {
33         struct net_device *dev = skb->dev;
34         struct vlan_rx_stats     *rx_stats;
35
36         skb->dev = vlan_dev_info(dev)->real_dev;
37         netif_nit_deliver(skb);
38
39         skb->dev = dev;
40         skb->priority = vlan_get_ingress_priority(dev, skb->vlan_tci);
41         skb->vlan_tci = 0;
42
43         rx_stats = per_cpu_ptr(vlan_dev_info(dev)->vlan_rx_stats,
44                                smp_processor_id());
45
46         rx_stats->rx_packets++;
47         rx_stats->rx_bytes += skb->len;
48
49         switch (skb->pkt_type) {
50         case PACKET_BROADCAST:
51                 break;
52         case PACKET_MULTICAST:
53                 rx_stats->multicast++;
54                 break;
55         case PACKET_OTHERHOST:
56                 /* Our lower layer thinks this is not local, let's make sure.
57                  * This allows the VLAN to have a different MAC than the
58                  * underlying device, and still route correctly. */
59                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
60                                         dev->dev_addr))
61                         skb->pkt_type = PACKET_HOST;
62                 break;
63         };
64         return 0;
65 }
66
67 struct net_device *vlan_dev_real_dev(const struct net_device *dev)
68 {
69         return vlan_dev_info(dev)->real_dev;
70 }
71 EXPORT_SYMBOL(vlan_dev_real_dev);
72
73 u16 vlan_dev_vlan_id(const struct net_device *dev)
74 {
75         return vlan_dev_info(dev)->vlan_id;
76 }
77 EXPORT_SYMBOL(vlan_dev_vlan_id);
78
79 static gro_result_t
80 vlan_gro_common(struct napi_struct *napi, struct vlan_group *grp,
81                 unsigned int vlan_tci, struct sk_buff *skb)
82 {
83         struct sk_buff *p;
84
85         if (skb_bond_should_drop(skb))
86                 goto drop;
87
88         __vlan_hwaccel_put_tag(skb, vlan_tci);
89         skb->dev = vlan_group_get_device(grp, vlan_tci & VLAN_VID_MASK);
90
91         if (!skb->dev)
92                 goto drop;
93
94         for (p = napi->gro_list; p; p = p->next) {
95                 NAPI_GRO_CB(p)->same_flow =
96                         p->dev == skb->dev && !compare_ether_header(
97                                 skb_mac_header(p), skb_gro_mac_header(skb));
98                 NAPI_GRO_CB(p)->flush = 0;
99         }
100
101         return dev_gro_receive(napi, skb);
102
103 drop:
104         return GRO_DROP;
105 }
106
107 gro_result_t vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
108                               unsigned int vlan_tci, struct sk_buff *skb)
109 {
110         if (netpoll_rx_on(skb))
111                 return vlan_hwaccel_receive_skb(skb, grp, vlan_tci)
112                         ? GRO_DROP : GRO_NORMAL;
113
114         skb_gro_reset_offset(skb);
115
116         return napi_skb_finish(vlan_gro_common(napi, grp, vlan_tci, skb), skb);
117 }
118 EXPORT_SYMBOL(vlan_gro_receive);
119
120 gro_result_t vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
121                             unsigned int vlan_tci)
122 {
123         struct sk_buff *skb = napi_frags_skb(napi);
124
125         if (!skb)
126                 return GRO_DROP;
127
128         if (netpoll_rx_on(skb)) {
129                 skb->protocol = eth_type_trans(skb, skb->dev);
130                 return vlan_hwaccel_receive_skb(skb, grp, vlan_tci)
131                         ? GRO_DROP : GRO_NORMAL;
132         }
133
134         return napi_frags_finish(napi, skb,
135                                  vlan_gro_common(napi, grp, vlan_tci, skb));
136 }
137 EXPORT_SYMBOL(vlan_gro_frags);