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TOMOYO Linux Cross Reference
Linux/arch/metag/include/asm/checksum.h

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  1 #ifndef _METAG_CHECKSUM_H
  2 #define _METAG_CHECKSUM_H
  3 
  4 /*
  5  * computes the checksum of a memory block at buff, length len,
  6  * and adds in "sum" (32-bit)
  7  *
  8  * returns a 32-bit number suitable for feeding into itself
  9  * or csum_tcpudp_magic
 10  *
 11  * this function must be called with even lengths, except
 12  * for the last fragment, which may be odd
 13  *
 14  * it's best to have buff aligned on a 32-bit boundary
 15  */
 16 extern __wsum csum_partial(const void *buff, int len, __wsum sum);
 17 
 18 /*
 19  * the same as csum_partial, but copies from src while it
 20  * checksums
 21  *
 22  * here even more important to align src and dst on a 32-bit (or even
 23  * better 64-bit) boundary
 24  */
 25 extern __wsum csum_partial_copy(const void *src, void *dst, int len,
 26                                 __wsum sum);
 27 
 28 /*
 29  * the same as csum_partial_copy, but copies from user space.
 30  *
 31  * here even more important to align src and dst on a 32-bit (or even
 32  * better 64-bit) boundary
 33  */
 34 extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
 35                                         int len, __wsum sum, int *csum_err);
 36 
 37 #define csum_partial_copy_nocheck(src, dst, len, sum)   \
 38         csum_partial_copy((src), (dst), (len), (sum))
 39 
 40 /*
 41  * Fold a partial checksum
 42  */
 43 static inline __sum16 csum_fold(__wsum csum)
 44 {
 45         u32 sum = (__force u32)csum;
 46         sum = (sum & 0xffff) + (sum >> 16);
 47         sum = (sum & 0xffff) + (sum >> 16);
 48         return (__force __sum16)~sum;
 49 }
 50 
 51 /*
 52  * This is a version of ip_compute_csum() optimized for IP headers,
 53  * which always checksum on 4 octet boundaries.
 54  */
 55 extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
 56 
 57 /*
 58  * computes the checksum of the TCP/UDP pseudo-header
 59  * returns a 16-bit checksum, already complemented
 60  */
 61 static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
 62                                         __u32 len, __u8 proto,
 63                                         __wsum sum)
 64 {
 65         unsigned long len_proto = (proto + len) << 8;
 66         asm ("ADDS   %0, %0, %1\n"
 67              "ADDCS  %0, %0, #1\n"
 68              "ADDS   %0, %0, %2\n"
 69              "ADDCS  %0, %0, #1\n"
 70              "ADDS   %0, %0, %3\n"
 71              "ADDCS  %0, %0, #1\n"
 72              : "=d" (sum)
 73              : "d" (daddr), "d" (saddr), "d" (len_proto),
 74                "" (sum)
 75              : "cc");
 76         return sum;
 77 }
 78 
 79 static inline __sum16
 80 csum_tcpudp_magic(__be32 saddr, __be32 daddr, __u32 len,
 81                   __u8 proto, __wsum sum)
 82 {
 83         return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
 84 }
 85 
 86 /*
 87  * this routine is used for miscellaneous IP-like checksums, mainly
 88  * in icmp.c
 89  */
 90 extern __sum16 ip_compute_csum(const void *buff, int len);
 91 
 92 #endif /* _METAG_CHECKSUM_H */
 93 

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