#ifndef CSUM_H #define CSUM_H #include #include #include #include "built_in.h" static inline unsigned short csum(unsigned short *buf, int nwords) { unsigned long sum; for (sum = 0; nwords > 0; nwords--) sum += *buf++; sum = (sum >> 16) + (sum & 0xffff); sum += (sum >> 16); return ~sum; } static inline uint16_t calc_csum(void *addr, size_t len) { return csum(addr, len >> 1); } static inline uint16_t csum_expected(uint16_t sum, uint16_t computed_sum) { uint32_t shouldbe; shouldbe = sum; shouldbe += ntohs(computed_sum); shouldbe = (shouldbe & 0xFFFF) + (shouldbe >> 16); shouldbe = (shouldbe & 0xFFFF) + (shouldbe >> 16); return shouldbe; } /* Taken and modified from tcpdump, Copyright belongs to them! */ struct cksum_vec { const uint8_t *ptr; int len; }; #define ADDCARRY(x) \ do { if ((x) > 65535) \ (x) -= 65535; \ } while (0) #define REDUCE \ do { \ l_util.l = sum; \ sum = l_util.s[0] + l_util.s[1]; \ ADDCARRY(sum); \ } while (0) static inline uint16_t __in_cksum(const struct cksum_vec *vec, int veclen) { const uint16_t *w; int sum = 0, mlen = 0; int byte_swapped = 0; union { uint8_t c[2]; uint16_t s; } s_util; union { uint16_t s[2]; uint32_t l; } l_util; for (; veclen != 0; vec++, veclen--) { if (vec->len == 0) continue; w = (const uint16_t *) (void *) vec->ptr; if (mlen == -1) { s_util.c[1] = *(const uint8_t *) w; sum += s_util.s; w = (const uint16_t *) (void *) ((const uint8_t *) w + 1); mlen = vec->len - 1; } else mlen = vec->len; if ((1 & (unsigned long) w) && (mlen > 0)) { REDUCE; sum <<= 8; s_util.c[0] = *(const uint8_t *) w; w = (const uint16_t *) (void *) ((const uint8_t *) w + 1); mlen--; byte_swapped = 1; } while ((mlen -= 32) >= 0) { sum += w[0]; sum += w[1]; sum += w[2]; sum += w[3]; sum += w[4]; sum += w[5]; sum += w[6]; sum += w[7]; sum += w[8]; sum += w[9]; sum += w[10]; sum += w[11]; sum += w[12]; sum += w[13]; sum += w[14]; sum += w[15]; w += 16; } mlen += 32; while ((mlen -= 8) >= 0) { sum += w[0]; sum += w[1]; sum += w[2]; sum += w[3]; w += 4; } mlen += 8; if (mlen == 0 && byte_swapped == 0) continue; REDUCE; while ((mlen -= 2) >= 0) { sum += *w++; } if (byte_swapped) { REDUCE; sum <<= 8; byte_swapped = 0; if (mlen == -1) { s_util.c[1] = *(const uint8_t *) w; sum += s_util.s; mlen = 0; } else mlen = -1; } else if (mlen == -1) s_util.c[0] = *(const uint8_t *) w; } if (mlen == -1) { s_util.c[1] = 0; sum += s_util.s; } REDUCE; return (~sum & 0xffff); } static inline uint16_t p4_csum(const struct ip *ip, const uint8_t *data, uint16_t len, uint8_t next_proto) { struct cksum_vec vec[2]; struct pseudo_hdr { uint32_t src; uint32_t dst; uint8_t mbz; uint8_t proto; uint16_t len; } ph; ph.src = ip->ip_src.s_addr; ph.dst = ip->ip_dst.s_addr; ph.mbz = 0; ph.proto = next_proto; ph.len = htons(len); vec[0].ptr = (const uint8_t *) (void *) &ph; vec[0].len = sizeof(ph); vec[1].ptr = data; vec[1].len = len; return __in_cksum(vec, 2); } static inline uint16_t p6_csum(const struct ip6_hdr *ip6, const uint8_t *data, uint32_t len, uint8_t next_proto) { struct cksum_vec vec[2]; struct pseudo_hdr { uint8_t src[16]; uint8_t dst[16]; uint32_t len; uint8_t mbz[3]; uint8_t proto; } __packed ph; memcpy(&ph.src, ip6->ip6_src.s6_addr, sizeof(ph.src)); memcpy(&ph.dst, ip6->ip6_dst.s6_addr, sizeof(ph.dst)); ph.len = htons(len); memset(&ph.mbz, 0, sizeof(ph.mbz)); ph.proto = next_proto; vec[0].ptr = (const uint8_t *) (void *) &ph; vec[0].len = sizeof(ph); vec[1].ptr = data; vec[1].len = len; return __in_cksum(vec, 2); } #endif /* CSUM_H */ ass='commit-info'> authorLinus Torvalds <torvalds@linux-foundation.org>2016-12-12 21:58:13 -0800 committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-12 21:58:13 -0800 commite7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba (patch) treef63906f41699c8e38af9d12b063e2ceab0286ef2 /arch/ia64/kernel parente34bac726d27056081d0250c0e173e4b155aa340 (diff)parent868c97a846a73e937d835b09b8c885a69df50ec8 (diff)

Merge tag 'docs-4.10' of git://git.lwn.net/linuxHEAD master

Pull documentation update from Jonathan Corbet: "These are the documentation changes for 4.10. It's another busy cycle for the docs tree, as the sphinx conversion continues. Highlights include: - Further work on PDF output, which remains a bit of a pain but should be more solid now. - Five more DocBook template files converted to Sphinx. Only 27 to go... Lots of plain-text files have also been converted and integrated. - Images in binary formats have been replaced with more source-friendly versions. - Various bits of organizational work, including the renaming of various files discussed at the kernel summit. - New documentation for the device_link mechanism. ... and, of course, lots of typo fixes and small updates" * tag 'docs-4.10' of git://git.lwn.net/linux: (193 commits) dma-buf: Extract dma-buf.rst Update Documentation/00-INDEX docs: 00-INDEX: document directories/files with no docs docs: 00-INDEX: remove non-existing entries docs: 00-INDEX: add missing entries for documentation files/dirs docs: 00-INDEX: consolidate process/ and admin-guide/ description scripts: add a script to check if Documentation/00-INDEX is sane Docs: change sh -> awk in REPORTING-BUGS Documentation/core-api/device_link: Add initial documentation core-api: remove an unexpected unident ppc/idle: Add documentation for powersave=off Doc: Correct typo, "Introdution" => "Introduction" Documentation/atomic_ops.txt: convert to ReST markup Documentation/local_ops.txt: convert to ReST markup Documentation/assoc_array.txt: convert to ReST markup docs-rst: parse-headers.pl: cleanup the documentation docs-rst: fix media cleandocs target docs-rst: media/Makefile: reorganize the rules docs-rst: media: build SVG from graphviz files docs-rst: replace bayer.png by a SVG image ...

Diffstat (limited to 'arch/ia64/kernel')