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7c7f32c9ee
GCC uses the number of lines of an inline assembly to calculate its length (number of instructions). This has an impact on GCCs inlining decisions. Therefore remove superfluous new lines from a couple of inline assemblies, so that their real size is reflected. Also use an "asm inline" statement for the fpu_lfpc_safe() inline assembly to enforce that GCC assumes the minimum size for this inline assembly, since it contains various statements which make it appear much larger than the resulting code is. Suggested-by: Juergen Christ <jchrist@linux.ibm.com> Reviewed-by: Juergen Christ <jchrist@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
128 lines
3.2 KiB
C
128 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* S390 fast network checksum routines
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*
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* S390 version
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* Copyright IBM Corp. 1999
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* Author(s): Ulrich Hild (first version)
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* Martin Schwidefsky (heavily optimized CKSM version)
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* D.J. Barrow (third attempt)
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*/
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#ifndef _S390_CHECKSUM_H
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#define _S390_CHECKSUM_H
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#include <linux/instrumented.h>
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#include <linux/kmsan-checks.h>
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#include <linux/in6.h>
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static inline __wsum cksm(const void *buff, int len, __wsum sum)
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{
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union register_pair rp = {
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.even = (unsigned long)buff,
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.odd = (unsigned long)len,
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};
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instrument_read(buff, len);
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kmsan_check_memory(buff, len);
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asm volatile(
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"0: cksm %[sum],%[rp]\n"
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" jo 0b\n"
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: [sum] "+&d" (sum), [rp] "+&d" (rp.pair) : : "cc", "memory");
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return sum;
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}
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__wsum csum_partial(const void *buff, int len, __wsum sum);
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#define _HAVE_ARCH_CSUM_AND_COPY
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__wsum csum_partial_copy_nocheck(const void *src, void *dst, int len);
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/*
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* Fold a partial checksum without adding pseudo headers.
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*/
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static inline __sum16 csum_fold(__wsum sum)
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{
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u32 csum = (__force u32) sum;
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csum += (csum >> 16) | (csum << 16);
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csum >>= 16;
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return (__force __sum16) ~csum;
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}
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/*
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* This is a version of ip_compute_csum() optimized for IP headers,
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* which always checksums on 4 octet boundaries.
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*/
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static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
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{
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__u64 csum = 0;
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__u32 *ptr = (u32 *)iph;
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csum += *ptr++;
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csum += *ptr++;
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csum += *ptr++;
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csum += *ptr++;
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ihl -= 4;
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while (ihl--)
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csum += *ptr++;
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csum += (csum >> 32) | (csum << 32);
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return csum_fold((__force __wsum)(csum >> 32));
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}
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/*
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* Computes the checksum of the TCP/UDP pseudo-header.
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* Returns a 32-bit checksum.
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*/
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static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len,
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__u8 proto, __wsum sum)
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{
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__u64 csum = (__force __u64)sum;
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csum += (__force __u32)saddr;
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csum += (__force __u32)daddr;
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csum += len;
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csum += proto;
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csum += (csum >> 32) | (csum << 32);
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return (__force __wsum)(csum >> 32);
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}
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/*
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* Computes the checksum of the TCP/UDP pseudo-header.
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* Returns a 16-bit checksum, already complemented.
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*/
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static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, __u32 len,
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__u8 proto, __wsum sum)
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{
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return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
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}
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/*
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* Used for miscellaneous IP-like checksums, mainly icmp.
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*/
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static inline __sum16 ip_compute_csum(const void *buff, int len)
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{
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return csum_fold(csum_partial(buff, len, 0));
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}
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#define _HAVE_ARCH_IPV6_CSUM
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static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
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const struct in6_addr *daddr,
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__u32 len, __u8 proto, __wsum csum)
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{
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__u64 sum = (__force __u64)csum;
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sum += (__force __u32)saddr->s6_addr32[0];
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sum += (__force __u32)saddr->s6_addr32[1];
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sum += (__force __u32)saddr->s6_addr32[2];
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sum += (__force __u32)saddr->s6_addr32[3];
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sum += (__force __u32)daddr->s6_addr32[0];
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sum += (__force __u32)daddr->s6_addr32[1];
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sum += (__force __u32)daddr->s6_addr32[2];
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sum += (__force __u32)daddr->s6_addr32[3];
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sum += len;
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sum += proto;
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sum += (sum >> 32) | (sum << 32);
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return csum_fold((__force __wsum)(sum >> 32));
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}
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#endif /* _S390_CHECKSUM_H */
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