Add support for offloading IP/TCP/UDP checksums to NIC hardware which

supports them.

1 files changed, 25 insertions, 0 deletions

diff --git a/sys/i386/include/in_cksum.h b/sys/i386/include/in_cksum.h
index a441959..3c971ef 100644
--- a/sys/i386/include/in_cksum.h
+++ b/sys/i386/include/in_cksum.h
@@ -81,6 +81,30 @@ in_cksum_update(struct ip *ip)
 	ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16));
 }
 
+static __inline u_short
+in_addword(u_short sum, u_short b)
+{
+		    
+	__asm("addw %2, %0" : "=r" (sum) : "0" (sum), "r" (b));
+	__asm("adcw $0, %0" : "=r" (sum) : "0" (sum));
+
+	return (sum);
+}
+
+static __inline u_short
+in_pseudo(u_int sum, u_int b, u_int c)
+{
+		    
+	__asm("addl %2, %0" : "=r" (sum) : "0" (sum), "r" (b));
+	__asm("adcl %2, %0" : "=r" (sum) : "0" (sum), "r" (c));
+	__asm("adcl $0, %0" : "=r" (sum) : "0" (sum));
+
+	sum = (sum & 0xffff) + (sum >> 16);
+	if (sum > 0xffff)
+		sum -= 0xffff;
+	return (sum);
+}
+
 #else
 u_int in_cksum_hdr __P((const struct ip *));
 #define	in_cksum_update(ip) \
@@ -94,6 +118,7 @@ u_int in_cksum_hdr __P((const struct ip *));
 
 typedef	unsigned in_psum_t;
 #ifdef _KERNEL
+u_short	in_cksum_skip(struct mbuf *m, int len, int skip); 
 in_psum_t in_cksum_partial(in_psum_t psum, const u_short *w, int len);
 int	in_cksum_finalize(in_psum_t psum);
 #endif /* _KERNEL */