net: use skb_flow_dissect() in __skb_get_rxhash()

No functional changes.

This uses the code we factorized in skb_flow_dissect()

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/dev.c b/net/core/dev.c
index 8afb244..962e3de 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -133,11 +133,9 @@
 #include <linux/pci.h>
 #include <linux/inetdevice.h>
 #include <linux/cpu_rmap.h>
-#include <linux/if_tunnel.h>
-#include <linux/if_pppox.h>
-#include <linux/ppp_defs.h>
 #include <linux/net_tstamp.h>
 #include <linux/jump_label.h>
+#include <net/flow_keys.h>
 
 #include "net-sysfs.h"
 
@@ -2598,123 +2596,28 @@ static inline void ____napi_schedule(struct softnet_data *sd,
  */
 void __skb_get_rxhash(struct sk_buff *skb)
 {
-       int nhoff, hash = 0, poff;
-       const struct ipv6hdr *ip6;
-       const struct iphdr *ip;
-       const struct vlan_hdr *vlan;
-       u8 ip_proto;
-       u32 addr1, addr2;
-       u16 proto;
-       union {
-               u32 v32;
-               u16 v16[2];
-       } ports;
-
-       nhoff = skb_network_offset(skb);
-       proto = skb->protocol;
-
-again:
-       switch (proto) {
-       case __constant_htons(ETH_P_IP):
-ip:
-               if (!pskb_may_pull(skb, sizeof(*ip) + nhoff))
-                       goto done;
-
-               ip = (const struct iphdr *) (skb->data + nhoff);
-               if (ip_is_fragment(ip))
-                       ip_proto = 0;
-               else
-                       ip_proto = ip->protocol;
-               addr1 = (__force u32) ip->saddr;
-               addr2 = (__force u32) ip->daddr;
-               nhoff += ip->ihl * 4;
-               break;
-       case __constant_htons(ETH_P_IPV6):
-ipv6:
-               if (!pskb_may_pull(skb, sizeof(*ip6) + nhoff))
-                       goto done;
-
-               ip6 = (const struct ipv6hdr *) (skb->data + nhoff);
-               ip_proto = ip6->nexthdr;
-               addr1 = (__force u32) ip6->saddr.s6_addr32[3];
-               addr2 = (__force u32) ip6->daddr.s6_addr32[3];
-               nhoff += 40;
-               break;
-       case __constant_htons(ETH_P_8021Q):
-               if (!pskb_may_pull(skb, sizeof(*vlan) + nhoff))
-                       goto done;
-               vlan = (const struct vlan_hdr *) (skb->data + nhoff);
-               proto = vlan->h_vlan_encapsulated_proto;
-               nhoff += sizeof(*vlan);
-               goto again;
-       case __constant_htons(ETH_P_PPP_SES):
-               if (!pskb_may_pull(skb, PPPOE_SES_HLEN + nhoff))
-                       goto done;
-               proto = *((__be16 *) (skb->data + nhoff +
-                                     sizeof(struct pppoe_hdr)));
-               nhoff += PPPOE_SES_HLEN;
-               switch (proto) {
-               case __constant_htons(PPP_IP):
-                       goto ip;
-               case __constant_htons(PPP_IPV6):
-                       goto ipv6;
-               default:
-                       goto done;
-               }
-       default:
-               goto done;
-       }
-
-       switch (ip_proto) {
-       case IPPROTO_GRE:
-               if (pskb_may_pull(skb, nhoff + 16)) {
-                       u8 *h = skb->data + nhoff;
-                       __be16 flags = *(__be16 *)h;
+       struct flow_keys keys;
+       u32 hash;
 
-                       /*
-                        * Only look inside GRE if version zero and no
-                        * routing
-                        */
-                       if (!(flags & (GRE_VERSION|GRE_ROUTING))) {
-                               proto = *(__be16 *)(h + 2);
-                               nhoff += 4;
-                               if (flags & GRE_CSUM)
-                                       nhoff += 4;
-                               if (flags & GRE_KEY)
-                                       nhoff += 4;
-                               if (flags & GRE_SEQ)
-                                       nhoff += 4;
-                               goto again;
-                       }
-               }
-               break;
-       case IPPROTO_IPIP:
-               goto again;
-       default:
-               break;
-       }
+       if (!skb_flow_dissect(skb, &keys))
+               return;
 
-       ports.v32 = 0;
-       poff = proto_ports_offset(ip_proto);
-       if (poff >= 0) {
-               nhoff += poff;
-               if (pskb_may_pull(skb, nhoff + 4)) {
-                       ports.v32 = * (__force u32 *) (skb->data + nhoff);
-                       if (ports.v16[1] < ports.v16[0])
-                               swap(ports.v16[0], ports.v16[1]);
-                       skb->l4_rxhash = 1;
-               }
+       if (keys.ports) {
+               if ((__force u16)keys.port16[1] < (__force u16)keys.port16[0])
+                       swap(keys.port16[0], keys.port16[1]);
+               skb->l4_rxhash = 1;
        }
 
        /* get a consistent hash (same value on both flow directions) */
-       if (addr2 < addr1)
-               swap(addr1, addr2);
+       if ((__force u32)keys.dst < (__force u32)keys.src)
+               swap(keys.dst, keys.src);
 
-       hash = jhash_3words(addr1, addr2, ports.v32, hashrnd);
+       hash = jhash_3words((__force u32)keys.dst,
+                           (__force u32)keys.src,
+                           (__force u32)keys.ports, hashrnd);
        if (!hash)
                hash = 1;
 
-done:
        skb->rxhash = hash;
 }
 EXPORT_SYMBOL(__skb_get_rxhash);