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Date: Tue, 8 Jan 2013 14:52:40 +0800
From: Cong Wang <amwang@...hat.com>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Cong Wang <amwang@...hat.com>
Subject: [PATCH net-next v5 2/4] ipv6: move csum_ipv6_magic() and udp6_csum_init() into static library
From: Cong Wang <amwang@...hat.com>
As suggested by David, udp6_csum_init() is too big to be inlined,
move it to ipv6 static library, net/ipv6/ip6_checksum.c.
And the generic csum_ipv6_magic() too.
Cc: David S. Miller <davem@...emloft.net>
Signed-off-by: Cong Wang <amwang@...hat.com>
---
include/net/ip6_checksum.h | 62 ++--------------------------
net/ipv6/Makefile | 2 +-
net/ipv6/ip6_checksum.c | 97 ++++++++++++++++++++++++++++++++++++++++++++
net/ipv6/udp.c | 34 ---------------
4 files changed, 103 insertions(+), 92 deletions(-)
create mode 100644 net/ipv6/ip6_checksum.c
diff --git a/include/net/ip6_checksum.h b/include/net/ip6_checksum.h
index 652d3d3..7686e3f 100644
--- a/include/net/ip6_checksum.h
+++ b/include/net/ip6_checksum.h
@@ -35,63 +35,10 @@
#include <linux/ipv6.h>
#ifndef _HAVE_ARCH_IPV6_CSUM
-
-static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
- const struct in6_addr *daddr,
- __u32 len, unsigned short proto,
- __wsum csum)
-{
-
- int carry;
- __u32 ulen;
- __u32 uproto;
- __u32 sum = (__force u32)csum;
-
- sum += (__force u32)saddr->s6_addr32[0];
- carry = (sum < (__force u32)saddr->s6_addr32[0]);
- sum += carry;
-
- sum += (__force u32)saddr->s6_addr32[1];
- carry = (sum < (__force u32)saddr->s6_addr32[1]);
- sum += carry;
-
- sum += (__force u32)saddr->s6_addr32[2];
- carry = (sum < (__force u32)saddr->s6_addr32[2]);
- sum += carry;
-
- sum += (__force u32)saddr->s6_addr32[3];
- carry = (sum < (__force u32)saddr->s6_addr32[3]);
- sum += carry;
-
- sum += (__force u32)daddr->s6_addr32[0];
- carry = (sum < (__force u32)daddr->s6_addr32[0]);
- sum += carry;
-
- sum += (__force u32)daddr->s6_addr32[1];
- carry = (sum < (__force u32)daddr->s6_addr32[1]);
- sum += carry;
-
- sum += (__force u32)daddr->s6_addr32[2];
- carry = (sum < (__force u32)daddr->s6_addr32[2]);
- sum += carry;
-
- sum += (__force u32)daddr->s6_addr32[3];
- carry = (sum < (__force u32)daddr->s6_addr32[3]);
- sum += carry;
-
- ulen = (__force u32)htonl((__u32) len);
- sum += ulen;
- carry = (sum < ulen);
- sum += carry;
-
- uproto = (__force u32)htonl(proto);
- sum += uproto;
- carry = (sum < uproto);
- sum += carry;
-
- return csum_fold((__force __wsum)sum);
-}
-
+__sum16 csum_ipv6_magic(const struct in6_addr *saddr,
+ const struct in6_addr *daddr,
+ __u32 len, unsigned short proto,
+ __wsum csum);
#endif
static __inline__ __sum16 tcp_v6_check(int len,
@@ -126,4 +73,5 @@ static inline void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb)
__tcp_v6_send_check(skb, &np->saddr, &np->daddr);
}
+int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto);
#endif
diff --git a/net/ipv6/Makefile b/net/ipv6/Makefile
index 4ea2448..309af19 100644
--- a/net/ipv6/Makefile
+++ b/net/ipv6/Makefile
@@ -40,7 +40,7 @@ obj-$(CONFIG_IPV6_SIT) += sit.o
obj-$(CONFIG_IPV6_TUNNEL) += ip6_tunnel.o
obj-$(CONFIG_IPV6_GRE) += ip6_gre.o
-obj-y += addrconf_core.o exthdrs_core.o
+obj-y += addrconf_core.o exthdrs_core.o ip6_checksum.o
obj-$(CONFIG_INET) += output_core.o protocol.o $(ipv6-offload)
obj-$(subst m,y,$(CONFIG_IPV6)) += inet6_hashtables.o
diff --git a/net/ipv6/ip6_checksum.c b/net/ipv6/ip6_checksum.c
new file mode 100644
index 0000000..72d198b
--- /dev/null
+++ b/net/ipv6/ip6_checksum.c
@@ -0,0 +1,97 @@
+#include <net/ip.h>
+#include <net/udp.h>
+#include <net/udplite.h>
+#include <asm/checksum.h>
+
+#ifndef _HAVE_ARCH_IPV6_CSUM
+__sum16 csum_ipv6_magic(const struct in6_addr *saddr,
+ const struct in6_addr *daddr,
+ __u32 len, unsigned short proto,
+ __wsum csum)
+{
+
+ int carry;
+ __u32 ulen;
+ __u32 uproto;
+ __u32 sum = (__force u32)csum;
+
+ sum += (__force u32)saddr->s6_addr32[0];
+ carry = (sum < (__force u32)saddr->s6_addr32[0]);
+ sum += carry;
+
+ sum += (__force u32)saddr->s6_addr32[1];
+ carry = (sum < (__force u32)saddr->s6_addr32[1]);
+ sum += carry;
+
+ sum += (__force u32)saddr->s6_addr32[2];
+ carry = (sum < (__force u32)saddr->s6_addr32[2]);
+ sum += carry;
+
+ sum += (__force u32)saddr->s6_addr32[3];
+ carry = (sum < (__force u32)saddr->s6_addr32[3]);
+ sum += carry;
+
+ sum += (__force u32)daddr->s6_addr32[0];
+ carry = (sum < (__force u32)daddr->s6_addr32[0]);
+ sum += carry;
+
+ sum += (__force u32)daddr->s6_addr32[1];
+ carry = (sum < (__force u32)daddr->s6_addr32[1]);
+ sum += carry;
+
+ sum += (__force u32)daddr->s6_addr32[2];
+ carry = (sum < (__force u32)daddr->s6_addr32[2]);
+ sum += carry;
+
+ sum += (__force u32)daddr->s6_addr32[3];
+ carry = (sum < (__force u32)daddr->s6_addr32[3]);
+ sum += carry;
+
+ ulen = (__force u32)htonl((__u32) len);
+ sum += ulen;
+ carry = (sum < ulen);
+ sum += carry;
+
+ uproto = (__force u32)htonl(proto);
+ sum += uproto;
+ carry = (sum < uproto);
+ sum += carry;
+
+ return csum_fold((__force __wsum)sum);
+}
+EXPORT_SYMBOL(csum_ipv6_magic);
+#endif
+
+int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto)
+{
+ int err;
+
+ UDP_SKB_CB(skb)->partial_cov = 0;
+ UDP_SKB_CB(skb)->cscov = skb->len;
+
+ if (proto == IPPROTO_UDPLITE) {
+ err = udplite_checksum_init(skb, uh);
+ if (err)
+ return err;
+ }
+
+ if (uh->check == 0) {
+ /* RFC 2460 section 8.1 says that we SHOULD log
+ this error. Well, it is reasonable.
+ */
+ LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
+ return 1;
+ }
+ if (skb->ip_summed == CHECKSUM_COMPLETE &&
+ !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
+ skb->len, proto, skb->csum))
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+ if (!skb_csum_unnecessary(skb))
+ skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
+ &ipv6_hdr(skb)->daddr,
+ skb->len, proto, 0));
+
+ return 0;
+}
+EXPORT_SYMBOL(udp6_csum_init);
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index dfaa29b..1afb635 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -752,40 +752,6 @@ static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
return 0;
}
-static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
- int proto)
-{
- int err;
-
- UDP_SKB_CB(skb)->partial_cov = 0;
- UDP_SKB_CB(skb)->cscov = skb->len;
-
- if (proto == IPPROTO_UDPLITE) {
- err = udplite_checksum_init(skb, uh);
- if (err)
- return err;
- }
-
- if (uh->check == 0) {
- /* RFC 2460 section 8.1 says that we SHOULD log
- this error. Well, it is reasonable.
- */
- LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
- return 1;
- }
- if (skb->ip_summed == CHECKSUM_COMPLETE &&
- !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
- skb->len, proto, skb->csum))
- skb->ip_summed = CHECKSUM_UNNECESSARY;
-
- if (!skb_csum_unnecessary(skb))
- skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
- &ipv6_hdr(skb)->daddr,
- skb->len, proto, 0));
-
- return 0;
-}
-
int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
int proto)
{
--
1.7.7.6
--
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