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-rw-r--r--include/linux/etherdevice.h18
-rw-r--r--net/8021q/vlan_core.c9
-rw-r--r--net/core/dev.c10
3 files changed, 29 insertions, 8 deletions
diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
index 2308fbb4523a..fb6aa6070921 100644
--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h
@@ -237,13 +237,29 @@ static inline bool is_etherdev_addr(const struct net_device *dev,
* entry points.
*/
-static inline int compare_ether_header(const void *a, const void *b)
+static inline unsigned long compare_ether_header(const void *a, const void *b)
{
+#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
+ unsigned long fold;
+
+ /*
+ * We want to compare 14 bytes:
+ * [a0 ... a13] ^ [b0 ... b13]
+ * Use two long XOR, ORed together, with an overlap of two bytes.
+ * [a0 a1 a2 a3 a4 a5 a6 a7 ] ^ [b0 b1 b2 b3 b4 b5 b6 b7 ] |
+ * [a6 a7 a8 a9 a10 a11 a12 a13] ^ [b6 b7 b8 b9 b10 b11 b12 b13]
+ * This means the [a6 a7] ^ [b6 b7] part is done two times.
+ */
+ fold = *(unsigned long *)a ^ *(unsigned long *)b;
+ fold |= *(unsigned long *)(a + 6) ^ *(unsigned long *)(b + 6);
+ return fold;
+#else
u32 *a32 = (u32 *)((u8 *)a + 2);
u32 *b32 = (u32 *)((u8 *)b + 2);
return (*(u16 *)a ^ *(u16 *)b) | (a32[0] ^ b32[0]) |
(a32[1] ^ b32[1]) | (a32[2] ^ b32[2]);
+#endif
}
#endif /* _LINUX_ETHERDEVICE_H */
diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c
index 07eeb5b99dce..3438c01bbacf 100644
--- a/net/8021q/vlan_core.c
+++ b/net/8021q/vlan_core.c
@@ -105,9 +105,12 @@ vlan_gro_common(struct napi_struct *napi, struct vlan_group *grp,
goto drop;
for (p = napi->gro_list; p; p = p->next) {
- NAPI_GRO_CB(p)->same_flow =
- p->dev == skb->dev && !compare_ether_header(
- skb_mac_header(p), skb_gro_mac_header(skb));
+ unsigned long diffs;
+
+ diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
+ diffs |= compare_ether_header(skb_mac_header(p),
+ skb_gro_mac_header(skb));
+ NAPI_GRO_CB(p)->same_flow = !diffs;
NAPI_GRO_CB(p)->flush = 0;
}
diff --git a/net/core/dev.c b/net/core/dev.c
index 859e30ff044a..63bd20a75929 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3169,16 +3169,18 @@ normal:
}
EXPORT_SYMBOL(dev_gro_receive);
-static gro_result_t
+static inline gro_result_t
__napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
{
struct sk_buff *p;
for (p = napi->gro_list; p; p = p->next) {
- NAPI_GRO_CB(p)->same_flow =
- (p->dev == skb->dev) &&
- !compare_ether_header(skb_mac_header(p),
+ unsigned long diffs;
+
+ diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
+ diffs |= compare_ether_header(skb_mac_header(p),
skb_gro_mac_header(skb));
+ NAPI_GRO_CB(p)->same_flow = !diffs;
NAPI_GRO_CB(p)->flush = 0;
}