gro: New frags interface to avoid copying shinfo
[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         skb->vlan_tci = 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 net_device_stats *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         stats = &dev->stats;
44         stats->rx_packets++;
45         stats->rx_bytes += skb->len;
46
47         switch (skb->pkt_type) {
48         case PACKET_BROADCAST:
49                 break;
50         case PACKET_MULTICAST:
51                 stats->multicast++;
52                 break;
53         case PACKET_OTHERHOST:
54                 /* Our lower layer thinks this is not local, let's make sure.
55                  * This allows the VLAN to have a different MAC than the
56                  * underlying device, and still route correctly. */
57                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
58                                         dev->dev_addr))
59                         skb->pkt_type = PACKET_HOST;
60                 break;
61         };
62         return 0;
63 }
64
65 struct net_device *vlan_dev_real_dev(const struct net_device *dev)
66 {
67         return vlan_dev_info(dev)->real_dev;
68 }
69 EXPORT_SYMBOL(vlan_dev_real_dev);
70
71 u16 vlan_dev_vlan_id(const struct net_device *dev)
72 {
73         return vlan_dev_info(dev)->vlan_id;
74 }
75 EXPORT_SYMBOL(vlan_dev_vlan_id);
76
77 static int vlan_gro_common(struct napi_struct *napi, struct vlan_group *grp,
78                            unsigned int vlan_tci, struct sk_buff *skb)
79 {
80         struct sk_buff *p;
81
82         if (skb_bond_should_drop(skb))
83                 goto drop;
84
85         skb->vlan_tci = vlan_tci;
86         skb->dev = vlan_group_get_device(grp, vlan_tci & VLAN_VID_MASK);
87
88         if (!skb->dev)
89                 goto drop;
90
91         for (p = napi->gro_list; p; p = p->next) {
92                 NAPI_GRO_CB(p)->same_flow =
93                         p->dev == skb->dev && !compare_ether_header(
94                                 skb_mac_header(p), skb_gro_mac_header(skb));
95                 NAPI_GRO_CB(p)->flush = 0;
96         }
97
98         return dev_gro_receive(napi, skb);
99
100 drop:
101         return GRO_DROP;
102 }
103
104 int vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
105                      unsigned int vlan_tci, struct sk_buff *skb)
106 {
107         if (netpoll_rx_on(skb))
108                 return vlan_hwaccel_receive_skb(skb, grp, vlan_tci);
109
110         skb_gro_reset_offset(skb);
111
112         return napi_skb_finish(vlan_gro_common(napi, grp, vlan_tci, skb), skb);
113 }
114 EXPORT_SYMBOL(vlan_gro_receive);
115
116 int vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
117                    unsigned int vlan_tci)
118 {
119         struct sk_buff *skb = napi_frags_skb(napi);
120
121         if (!skb)
122                 return NET_RX_DROP;
123
124         if (netpoll_rx_on(skb))
125                 return vlan_hwaccel_receive_skb(skb, grp, vlan_tci);
126
127         return napi_frags_finish(napi, skb,
128                                  vlan_gro_common(napi, grp, vlan_tci, skb));
129 }
130 EXPORT_SYMBOL(vlan_gro_frags);