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checksum: add csum_iov()
Introduce the function csum_unfolded() that computes the unfolded 32-bit checksum of a data buffer, and call it from csum() that returns the folded value. Introduce csum_iov() that computes the checksum using csum_folded() on all vectors of the iovec array and returns the folded result. Signed-off-by: Laurent Vivier <lvivier@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Message-ID: <20240303135114.1023026-4-lvivier@redhat.com> [dwg: Fixed trivial cppcheck & clang-tidy regressions] Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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53
checksum.c
53
checksum.c
@ -57,6 +57,7 @@
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#include <linux/icmpv6.h>
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#include "util.h"
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#include "checksum.h"
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/* Checksums are optional for UDP over IPv4, so we usually just set
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* them to 0. Change this to 1 to calculate real UDP over IPv4
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@ -112,8 +113,6 @@ uint16_t csum_fold(uint32_t sum)
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return sum;
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}
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uint16_t csum(const void *buf, size_t len, uint32_t init);
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/**
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* csum_ip4_header() - Calculate and set IPv4 header checksum
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* @ip4h: IPv4 header
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@ -385,16 +384,17 @@ less_than_128_bytes:
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}
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/**
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* csum() - Compute TCP/IP-style checksum
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* csum_unfolded - Calculate the unfolded checksum of a data buffer.
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*
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* @buf: Input buffer
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* @len: Input length
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* @init: Initial 32-bit checksum, 0 for no pre-computed checksum
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*
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* Return: 16-bit folded, complemented checksum
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* Return: 32-bit unfolded
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*/
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/* NOLINTNEXTLINE(clang-diagnostic-unknown-attributes) */
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__attribute__((optimize("-fno-strict-aliasing"))) /* See csum_16b() */
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uint16_t csum(const void *buf, size_t len, uint32_t init)
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uint32_t csum_unfolded(const void *buf, size_t len, uint32_t init)
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{
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intptr_t align = ROUND_UP((intptr_t)buf, sizeof(__m256i));
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unsigned int pad = align - (intptr_t)buf;
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@ -408,16 +408,31 @@ uint16_t csum(const void *buf, size_t len, uint32_t init)
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if (len > pad)
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init = csum_avx2((void *)align, len - pad, init);
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return (uint16_t)~csum_fold(init);
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return init;
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}
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#else /* __AVX2__ */
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/**
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* csum_unfolded - Calculate the unfolded checksum of a data buffer.
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*
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* @buf: Input buffer
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* @len: Input length
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* @init: Initial 32-bit checksum, 0 for no pre-computed checksum
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*
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* Return: 32-bit unfolded checksum
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*/
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/* NOLINTNEXTLINE(clang-diagnostic-unknown-attributes) */
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__attribute__((optimize("-fno-strict-aliasing"))) /* See csum_16b() */
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uint32_t csum_unfolded(const void *buf, size_t len, uint32_t init)
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{
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return sum_16b(buf, len) + init;
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}
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#endif /* !__AVX2__ */
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/**
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* csum() - Compute TCP/IP-style checksum
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* @buf: Input buffer
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* @len: Input length
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* @sum: Initial 32-bit checksum, 0 for no pre-computed checksum
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* @init: Initial 32-bit checksum, 0 for no pre-computed checksum
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*
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* Return: 16-bit folded, complemented checksum
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*/
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@ -425,7 +440,25 @@ uint16_t csum(const void *buf, size_t len, uint32_t init)
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__attribute__((optimize("-fno-strict-aliasing"))) /* See csum_16b() */
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uint16_t csum(const void *buf, size_t len, uint32_t init)
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{
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return (uint16_t)~csum_fold(sum_16b(buf, len) + init);
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return (uint16_t)~csum_fold(csum_unfolded(buf, len, init));
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}
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#endif /* !__AVX2__ */
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/**
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* csum_iov() - Calculates the unfolded checksum over an array of IO vectors
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*
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* @iov Pointer to the array of IO vectors
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* @n Length of the array
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* @init Initial 32-bit checksum, 0 for no pre-computed checksum
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*
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* Return: 16-bit folded, complemented checksum
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*/
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/* cppcheck-suppress unusedFunction */
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uint16_t csum_iov(const struct iovec *iov, size_t n, uint32_t init)
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{
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unsigned int i;
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for (i = 0; i < n; i++)
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init = csum_unfolded(iov[i].iov_base, iov[i].iov_len, init);
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return (uint16_t)~csum_fold(init);
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}
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@ -17,13 +17,15 @@ void csum_ip4_header(struct iphdr *ip4h);
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void csum_udp4(struct udphdr *udp4hr,
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struct in_addr saddr, struct in_addr daddr,
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const void *payload, size_t len);
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void csum_icmp4(struct icmphdr *ih, const void *payload, size_t len);
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void csum_icmp4(struct icmphdr *icmp4hr, const void *payload, size_t len);
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void csum_udp6(struct udphdr *udp6hr,
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const struct in6_addr *saddr, const struct in6_addr *daddr,
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const void *payload, size_t len);
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void csum_icmp6(struct icmp6hdr *icmp6hr,
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const struct in6_addr *saddr, const struct in6_addr *daddr,
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const void *payload, size_t len);
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uint32_t csum_unfolded(const void *buf, size_t len, uint32_t init);
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uint16_t csum(const void *buf, size_t len, uint32_t init);
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uint16_t csum_iov(const struct iovec *iov, size_t n, uint32_t init);
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#endif /* CHECKSUM_H */
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