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authorMatthias Schiffer <mschiffer@universe-factory.net>2018-01-23 20:52:45 +0100
committerMatthias Schiffer <mschiffer@universe-factory.net>2018-01-25 11:00:48 +0100
commitad4232e3e986d89ac49f01bb2cec44d1e66d6969 (patch)
tree50dab7077fcbb54f1adb97b6ec98eb1c61830c33 /target/linux/ar71xx/patches-4.9
parent074fa8dfe42c525f4ac21e9f11e912d49ae1c5eb (diff)
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ar71xx: add unaligned access hacks for VXLAN
Gives a ~5% performance gain. Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
Diffstat (limited to 'target/linux/ar71xx/patches-4.9')
-rw-r--r--target/linux/ar71xx/patches-4.9/910-unaligned_access_hacks.patch92
1 files changed, 92 insertions, 0 deletions
diff --git a/target/linux/ar71xx/patches-4.9/910-unaligned_access_hacks.patch b/target/linux/ar71xx/patches-4.9/910-unaligned_access_hacks.patch
index 92f0a67658..f26af24d14 100644
--- a/target/linux/ar71xx/patches-4.9/910-unaligned_access_hacks.patch
+++ b/target/linux/ar71xx/patches-4.9/910-unaligned_access_hacks.patch
@@ -886,3 +886,95 @@
};
if (skb->ip_summed != CHECKSUM_PARTIAL) {
*sum = csum_fold(csum_partial(diff, sizeof(diff),
+--- a/drivers/net/vxlan.c
++++ b/drivers/net/vxlan.c
+@@ -1811,15 +1811,15 @@ static int vxlan_build_skb(struct sk_buf
+ goto out_free;
+
+ vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
+- vxh->vx_flags = VXLAN_HF_VNI;
+- vxh->vx_vni = vxlan_vni_field(vni);
++ net_hdr_word(&vxh->vx_flags) = VXLAN_HF_VNI;
++ net_hdr_word(&vxh->vx_vni) = vxlan_vni_field(vni);
+
+ if (type & SKB_GSO_TUNNEL_REMCSUM) {
+ unsigned int start;
+
+ start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
+- vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
+- vxh->vx_flags |= VXLAN_HF_RCO;
++ net_hdr_word(&vxh->vx_vni) |= vxlan_compute_rco(start, skb->csum_offset);
++ net_hdr_word(&vxh->vx_flags) |= VXLAN_HF_RCO;
+
+ if (!skb_is_gso(skb)) {
+ skb->ip_summed = CHECKSUM_NONE;
+--- a/include/linux/etherdevice.h
++++ b/include/linux/etherdevice.h
+@@ -435,7 +435,7 @@ static inline bool is_etherdev_addr(cons
+ * @b: Pointer to Ethernet header
+ *
+ * Compare two Ethernet headers, returns 0 if equal.
+- * This assumes that the network header (i.e., IP header) is 4-byte
++ * This assumes that the network header (i.e., IP header) is 2-byte
+ * aligned OR the platform can handle unaligned access. This is the
+ * case for all packets coming into netif_receive_skb or similar
+ * entry points.
+@@ -458,11 +458,12 @@ static inline unsigned long compare_ethe
+ fold |= *(unsigned long *)(a + 6) ^ *(unsigned long *)(b + 6);
+ return fold;
+ #else
+- u32 *a32 = (u32 *)((u8 *)a + 2);
+- u32 *b32 = (u32 *)((u8 *)b + 2);
++ const u16 *a16 = a;
++ const u16 *b16 = b;
+
+- return (*(u16 *)a ^ *(u16 *)b) | (a32[0] ^ b32[0]) |
+- (a32[1] ^ b32[1]) | (a32[2] ^ b32[2]);
++ return (a16[0] ^ b16[0]) | (a16[1] ^ b16[1]) | (a16[2] ^ b16[2]) |
++ (a16[3] ^ b16[3]) | (a16[4] ^ b16[4]) | (a16[5] ^ b16[5]) |
++ (a16[6] ^ b16[6]);
+ #endif
+ }
+
+--- a/net/ipv4/tcp_offload.c
++++ b/net/ipv4/tcp_offload.c
+@@ -215,7 +215,7 @@ struct sk_buff **tcp_gro_receive(struct
+
+ th2 = tcp_hdr(p);
+
+- if (*(u32 *)&th->source ^ *(u32 *)&th2->source) {
++ if (net_hdr_word(&th->source) ^ net_hdr_word(&th2->source)) {
+ NAPI_GRO_CB(p)->same_flow = 0;
+ continue;
+ }
+@@ -233,8 +233,8 @@ found:
+ ~(TCP_FLAG_CWR | TCP_FLAG_FIN | TCP_FLAG_PSH));
+ flush |= (__force int)(th->ack_seq ^ th2->ack_seq);
+ for (i = sizeof(*th); i < thlen; i += 4)
+- flush |= *(u32 *)((u8 *)th + i) ^
+- *(u32 *)((u8 *)th2 + i);
++ flush |= net_hdr_word((u8 *)th + i) ^
++ net_hdr_word((u8 *)th2 + i);
+
+ /* When we receive our second frame we can made a decision on if we
+ * continue this flow as an atomic flow with a fixed ID or if we use
+--- a/net/ipv6/netfilter/ip6table_mangle.c
++++ b/net/ipv6/netfilter/ip6table_mangle.c
+@@ -58,7 +58,7 @@ ip6t_mangle_out(struct sk_buff *skb, con
+ hop_limit = ipv6_hdr(skb)->hop_limit;
+
+ /* flowlabel and prio (includes version, which shouldn't change either */
+- flowlabel = *((u_int32_t *)ipv6_hdr(skb));
++ flowlabel = net_hdr_word(ipv6_hdr(skb));
+
+ ret = ip6t_do_table(skb, state, state->net->ipv6.ip6table_mangle);
+
+@@ -67,7 +67,7 @@ ip6t_mangle_out(struct sk_buff *skb, con
+ !ipv6_addr_equal(&ipv6_hdr(skb)->daddr, &daddr) ||
+ skb->mark != mark ||
+ ipv6_hdr(skb)->hop_limit != hop_limit ||
+- flowlabel != *((u_int32_t *)ipv6_hdr(skb)))) {
++ flowlabel != net_hdr_word(ipv6_hdr(skb)))) {
+ err = ip6_route_me_harder(state->net, skb);
+ if (err < 0)
+ ret = NF_DROP_ERR(err);