Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) #ifndef __ASM_GENERIC_CHECKSUM_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #define __ASM_GENERIC_CHECKSUM_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * computes the checksum of a memory block at buff, length len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * and adds in "sum" (32-bit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  * returns a 32-bit number suitable for feeding into itself
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * or csum_tcpudp_magic
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  * this function must be called with even lengths, except
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  * for the last fragment, which may be odd
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  * it's best to have buff aligned on a 32-bit boundary
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) extern __wsum csum_partial(const void *buff, int len, __wsum sum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #ifndef ip_fast_csum
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)  * This is a version of ip_compute_csum() optimized for IP headers,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)  * which always checksum on 4 octet boundaries.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #ifndef csum_fold
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)  * Fold a partial checksum
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) static inline __sum16 csum_fold(__wsum csum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	u32 sum = (__force u32)csum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	sum = (sum & 0xffff) + (sum >> 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	sum = (sum & 0xffff) + (sum >> 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	return (__force __sum16)~sum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #ifndef csum_tcpudp_nofold
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)  * computes the checksum of the TCP/UDP pseudo-header
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)  * returns a 16-bit checksum, already complemented
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) extern __wsum
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 		   __u8 proto, __wsum sum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #ifndef csum_tcpudp_magic
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) static inline __sum16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) csum_tcpudp_magic(__be32 saddr, __be32 daddr, __u32 len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 		  __u8 proto, __wsum sum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)  * this routine is used for miscellaneous IP-like checksums, mainly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)  * in icmp.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) extern __sum16 ip_compute_csum(const void *buff, int len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) #endif /* __ASM_GENERIC_CHECKSUM_H */