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 bool vlan_hwaccel_do_receive(struct sk_buff **skbp) 8 { 9 struct sk_buff *skb = *skbp; 10 u16 vlan_id = skb->vlan_tci & VLAN_VID_MASK; 11 struct net_device *vlan_dev; 12 struct vlan_pcpu_stats *rx_stats; 13 14 vlan_dev = vlan_find_dev(skb->dev, vlan_id); 15 if (!vlan_dev) { 16 if (vlan_id) 17 skb->pkt_type = PACKET_OTHERHOST; 18 return false; 19 } 20 21 skb = *skbp = skb_share_check(skb, GFP_ATOMIC); 22 if (unlikely(!skb)) 23 return false; 24 25 skb->dev = vlan_dev; 26 skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci); 27 skb->vlan_tci = 0; 28 29 rx_stats = this_cpu_ptr(vlan_dev_info(vlan_dev)->vlan_pcpu_stats); 30 31 u64_stats_update_begin(&rx_stats->syncp); 32 rx_stats->rx_packets++; 33 rx_stats->rx_bytes += skb->len; 34 35 switch (skb->pkt_type) { 36 case PACKET_BROADCAST: 37 break; 38 case PACKET_MULTICAST: 39 rx_stats->rx_multicast++; 40 break; 41 case PACKET_OTHERHOST: 42 /* Our lower layer thinks this is not local, let's make sure. 43 * This allows the VLAN to have a different MAC than the 44 * underlying device, and still route correctly. */ 45 if (!compare_ether_addr(eth_hdr(skb)->h_dest, 46 vlan_dev->dev_addr)) 47 skb->pkt_type = PACKET_HOST; 48 break; 49 } 50 u64_stats_update_end(&rx_stats->syncp); 51 52 return true; 53 } 54 55 struct net_device *vlan_dev_real_dev(const struct net_device *dev) 56 { 57 return vlan_dev_info(dev)->real_dev; 58 } 59 EXPORT_SYMBOL(vlan_dev_real_dev); 60 61 u16 vlan_dev_vlan_id(const struct net_device *dev) 62 { 63 return vlan_dev_info(dev)->vlan_id; 64 } 65 EXPORT_SYMBOL(vlan_dev_vlan_id); 66 67 /* VLAN rx hw acceleration helper. This acts like netif_{rx,receive_skb}(). */ 68 int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp, 69 u16 vlan_tci, int polling) 70 { 71 __vlan_hwaccel_put_tag(skb, vlan_tci); 72 return polling ? netif_receive_skb(skb) : netif_rx(skb); 73 } 74 EXPORT_SYMBOL(__vlan_hwaccel_rx); 75 76 gro_result_t vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp, 77 unsigned int vlan_tci, struct sk_buff *skb) 78 { 79 __vlan_hwaccel_put_tag(skb, vlan_tci); 80 return napi_gro_receive(napi, skb); 81 } 82 EXPORT_SYMBOL(vlan_gro_receive); 83 84 gro_result_t vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp, 85 unsigned int vlan_tci) 86 { 87 __vlan_hwaccel_put_tag(napi->skb, vlan_tci); 88 return napi_gro_frags(napi); 89 } 90 EXPORT_SYMBOL(vlan_gro_frags); 91