net: vlan: enable soft features regardless of underlying device
[linux-2.6.git] / net / 8021q / vlan_core.c
index f980b91..fcc6846 100644 (file)
 #include <linux/skbuff.h>
 #include <linux/netdevice.h>
 #include <linux/if_vlan.h>
+#include <linux/netpoll.h>
 #include "vlan.h"
 
-/* VLAN rx hw acceleration helper.  This acts like netif_{rx,receive_skb}(). */
-int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
-                     unsigned short vlan_tag, int polling)
+bool vlan_do_receive(struct sk_buff **skbp)
 {
-       struct net_device_stats *stats;
+       struct sk_buff *skb = *skbp;
+       u16 vlan_id = skb->vlan_tci & VLAN_VID_MASK;
+       struct net_device *vlan_dev;
+       struct vlan_pcpu_stats *rx_stats;
 
-       if (skb_bond_should_drop(skb)) {
-               dev_kfree_skb_any(skb);
-               return NET_RX_DROP;
+       vlan_dev = vlan_find_dev(skb->dev, vlan_id);
+       if (!vlan_dev) {
+               if (vlan_id)
+                       skb->pkt_type = PACKET_OTHERHOST;
+               return false;
        }
 
-       skb->dev = vlan_group_get_device(grp, vlan_tag & VLAN_VID_MASK);
-       if (skb->dev == NULL) {
-               dev_kfree_skb_any(skb);
-               /* Not NET_RX_DROP, this is not being dropped
-                * due to congestion. */
-               return NET_RX_SUCCESS;
-       }
-       skb->dev->last_rx = jiffies;
-
-       stats = &skb->dev->stats;
-       stats->rx_packets++;
-       stats->rx_bytes += skb->len;
-
-       skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tag);
-       switch (skb->pkt_type) {
-       case PACKET_BROADCAST:
-               break;
-       case PACKET_MULTICAST:
-               stats->multicast++;
-               break;
-       case PACKET_OTHERHOST:
+       skb = *skbp = skb_share_check(skb, GFP_ATOMIC);
+       if (unlikely(!skb))
+               return false;
+
+       skb->dev = vlan_dev;
+       if (skb->pkt_type == PACKET_OTHERHOST) {
                /* Our lower layer thinks this is not local, let's make sure.
                 * This allows the VLAN to have a different MAC than the
                 * underlying device, and still route correctly. */
                if (!compare_ether_addr(eth_hdr(skb)->h_dest,
-                                       skb->dev->dev_addr))
+                                       vlan_dev->dev_addr))
                        skb->pkt_type = PACKET_HOST;
-               break;
-       };
-       return (polling ? netif_receive_skb(skb) : netif_rx(skb));
+       }
+
+       if (!(vlan_dev_info(vlan_dev)->flags & VLAN_FLAG_REORDER_HDR)) {
+               unsigned int offset = skb->data - skb_mac_header(skb);
+
+               /*
+                * vlan_insert_tag expect skb->data pointing to mac header.
+                * So change skb->data before calling it and change back to
+                * original position later
+                */
+               skb_push(skb, offset);
+               skb = *skbp = vlan_insert_tag(skb, skb->vlan_tci);
+               if (!skb)
+                       return false;
+               skb_pull(skb, offset + VLAN_HLEN);
+               skb_reset_mac_len(skb);
+       }
+
+       skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci);
+       skb->vlan_tci = 0;
+
+       rx_stats = this_cpu_ptr(vlan_dev_info(vlan_dev)->vlan_pcpu_stats);
+
+       u64_stats_update_begin(&rx_stats->syncp);
+       rx_stats->rx_packets++;
+       rx_stats->rx_bytes += skb->len;
+       if (skb->pkt_type == PACKET_MULTICAST)
+               rx_stats->rx_multicast++;
+       u64_stats_update_end(&rx_stats->syncp);
+
+       return true;
 }
-EXPORT_SYMBOL(__vlan_hwaccel_rx);
 
 struct net_device *vlan_dev_real_dev(const struct net_device *dev)
 {
        return vlan_dev_info(dev)->real_dev;
 }
-EXPORT_SYMBOL_GPL(vlan_dev_real_dev);
+EXPORT_SYMBOL(vlan_dev_real_dev);
 
 u16 vlan_dev_vlan_id(const struct net_device *dev)
 {
        return vlan_dev_info(dev)->vlan_id;
 }
-EXPORT_SYMBOL_GPL(vlan_dev_vlan_id);
+EXPORT_SYMBOL(vlan_dev_vlan_id);
+
+/* VLAN rx hw acceleration helper.  This acts like netif_{rx,receive_skb}(). */
+int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
+                     u16 vlan_tci, int polling)
+{
+       __vlan_hwaccel_put_tag(skb, vlan_tci);
+       return polling ? netif_receive_skb(skb) : netif_rx(skb);
+}
+EXPORT_SYMBOL(__vlan_hwaccel_rx);
+
+gro_result_t vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
+                             unsigned int vlan_tci, struct sk_buff *skb)
+{
+       __vlan_hwaccel_put_tag(skb, vlan_tci);
+       return napi_gro_receive(napi, skb);
+}
+EXPORT_SYMBOL(vlan_gro_receive);
+
+gro_result_t vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
+                           unsigned int vlan_tci)
+{
+       __vlan_hwaccel_put_tag(napi->skb, vlan_tci);
+       return napi_gro_frags(napi);
+}
+EXPORT_SYMBOL(vlan_gro_frags);
+
+static struct sk_buff *vlan_reorder_header(struct sk_buff *skb)
+{
+       if (skb_cow(skb, skb_headroom(skb)) < 0)
+               return NULL;
+       memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN);
+       skb->mac_header += VLAN_HLEN;
+       skb_reset_mac_len(skb);
+       return skb;
+}
+
+static void vlan_set_encap_proto(struct sk_buff *skb, struct vlan_hdr *vhdr)
+{
+       __be16 proto;
+       unsigned char *rawp;
+
+       /*
+        * Was a VLAN packet, grab the encapsulated protocol, which the layer
+        * three protocols care about.
+        */
+
+       proto = vhdr->h_vlan_encapsulated_proto;
+       if (ntohs(proto) >= 1536) {
+               skb->protocol = proto;
+               return;
+       }
+
+       rawp = skb->data;
+       if (*(unsigned short *) rawp == 0xFFFF)
+               /*
+                * This is a magic hack to spot IPX packets. Older Novell
+                * breaks the protocol design and runs IPX over 802.3 without
+                * an 802.2 LLC layer. We look for FFFF which isn't a used
+                * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
+                * but does for the rest.
+                */
+               skb->protocol = htons(ETH_P_802_3);
+       else
+               /*
+                * Real 802.2 LLC
+                */
+               skb->protocol = htons(ETH_P_802_2);
+}
+
+struct sk_buff *vlan_untag(struct sk_buff *skb)
+{
+       struct vlan_hdr *vhdr;
+       u16 vlan_tci;
+
+       if (unlikely(vlan_tx_tag_present(skb))) {
+               /* vlan_tci is already set-up so leave this for another time */
+               return skb;
+       }
+
+       skb = skb_share_check(skb, GFP_ATOMIC);
+       if (unlikely(!skb))
+               goto err_free;
+
+       if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
+               goto err_free;
+
+       vhdr = (struct vlan_hdr *) skb->data;
+       vlan_tci = ntohs(vhdr->h_vlan_TCI);
+       __vlan_hwaccel_put_tag(skb, vlan_tci);
+
+       skb_pull_rcsum(skb, VLAN_HLEN);
+       vlan_set_encap_proto(skb, vhdr);
+
+       skb = vlan_reorder_header(skb);
+       if (unlikely(!skb))
+               goto err_free;
+
+       return skb;
+
+err_free:
+       kfree_skb(skb);
+       return NULL;
+}