34 static unsigned do_csum(const unsigned char *buff, unsigned len)  in do_csum()  argument
39 	if (unlikely(len == 0))  in do_csum()
44 		len--;  in do_csum()
47 	count = len >> 1;		/* nr of 16-bit words.. */  in do_csum()
52 			len -= 2;  in do_csum()
62 				len -= 4;  in do_csum()
101 			if (len & 4) {  in do_csum()
106 		if (len & 2) {  in do_csum()
111 	if (len & 1)  in do_csum()
133 __wsum csum_partial(const void *buff, int len, __wsum sum)  in csum_partial()  argument
135 	return (__force __wsum)add32_with_carry(do_csum(buff, len),  in csum_partial()
143 __sum16 ip_compute_csum(const void *buff, int len)  in ip_compute_csum()  argument
145 	return csum_fold(csum_partial(buff,len,0));  in ip_compute_csum()