46 static unsigned int do_csum(const unsigned char *buff, int len)  in do_csum()  argument
51 	if (len <= 0)  in do_csum()
60 		len--;  in do_csum()
63 	if (len >= 2) {  in do_csum()
66 			len -= 2;  in do_csum()
69 		if (len >= 4) {  in do_csum()
70 			const unsigned char *end = buff + ((unsigned)len & ~3);  in do_csum()
82 		if (len & 2) {  in do_csum()
87 	if (len & 1)  in do_csum()
125 __wsum csum_partial(const void *buff, int len, __wsum wsum)  in csum_partial()  argument
128 	unsigned int result = do_csum(buff, len);  in csum_partial()
142 __sum16 ip_compute_csum(const void *buff, int len)  in ip_compute_csum()  argument
144 	return (__force __sum16)~do_csum(buff, len);  in ip_compute_csum()
152 csum_partial_copy_from_user(const void __user *src, void *dst, int len,  in csum_partial_copy_from_user()  argument
157 	missing = __copy_from_user(dst, src, len);  in csum_partial_copy_from_user()
159 		memset(dst + len - missing, 0, missing);  in csum_partial_copy_from_user()
164 	return csum_partial(dst, len, sum);  in csum_partial_copy_from_user()
172 csum_partial_copy(const void *src, void *dst, int len, __wsum sum)  in csum_partial_copy()  argument
174 	memcpy(dst, src, len);  in csum_partial_copy()
175 	return csum_partial(dst, len, sum);  in csum_partial_copy()
190 			  __u32 len, __u8 proto, __wsum sum)  in csum_tcpudp_nofold()  argument
197 	s += proto + len;  in csum_tcpudp_nofold()
199 	s += (proto + len) << 8;  in csum_tcpudp_nofold()