From: Dmitry Eremin-Solenikov <dmitry.ereminsoleni...@linaro.org> Separate main checksumming code, it will be used for packet checksum validation.
Signed-off-by: Dmitry Eremin-Solenikov <dmitry.ereminsoleni...@linaro.org> --- /** Email created from pull request 389 (lumag:parse-checksums) ** https://github.com/Linaro/odp/pull/389 ** Patch: https://github.com/Linaro/odp/pull/389.patch ** Base sha: 49ebafae0edebbc750742d8874ad0a7588286dea ** Merge commit sha: ab214b82da2a920444a5e65d029f3f42a98ec314 **/ platform/linux-generic/Makefile.am | 1 + .../linux-generic/include/odp_chksum_internal.h | 59 ++++++++++++++++++++++ platform/linux-generic/odp_chksum.c | 18 ++----- 3 files changed, 63 insertions(+), 15 deletions(-) create mode 100644 platform/linux-generic/include/odp_chksum_internal.h diff --git a/platform/linux-generic/Makefile.am b/platform/linux-generic/Makefile.am index 7e40448bd..9c7563fb1 100644 --- a/platform/linux-generic/Makefile.am +++ b/platform/linux-generic/Makefile.am @@ -134,6 +134,7 @@ noinst_HEADERS = \ include/odp_bitmap_internal.h \ include/odp_bitset.h \ include/odp_buffer_internal.h \ + include/odp_chksum_internal.h \ include/odp_classification_datamodel.h \ include/odp_classification_inlines.h \ include/odp_classification_internal.h \ diff --git a/platform/linux-generic/include/odp_chksum_internal.h b/platform/linux-generic/include/odp_chksum_internal.h new file mode 100644 index 000000000..779598bbf --- /dev/null +++ b/platform/linux-generic/include/odp_chksum_internal.h @@ -0,0 +1,59 @@ +/* Copyright (c) 2013, Linaro Limited + * All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +/** + * @file + * + * ODP checksum - implementation internal + */ + +#ifndef ODP_CHKSUM_INTERNAL_H_ +#define ODP_CHKSUM_INTERNAL_H_ + +#ifdef __cplusplus +extern "C" { +#endif + +/* Simple implementation of ones complement sum. + * Based on RFC1071 and its errata. + */ +static uint32_t _odp_chksum_ones_comp16_32(const void *p, uint32_t len, + odp_bool_t odd_offset) + +{ + uint32_t sum = 0; + const uint16_t *data = p; + + if (odd_offset) { + uint16_t left_over = 0; + + *(uint8_t *)&left_over = *(const uint8_t *)data; + sum = left_over; + data++; + len--; + } + + while (len > 1) { + sum += *data++; + len -= 2; + } + + /* Add left-over byte, if any */ + if (len > 0) { + uint16_t left_over = 0; + + *(uint8_t *)&left_over = *(const uint8_t *)data; + sum += left_over; + } + + return sum; +} + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/platform/linux-generic/odp_chksum.c b/platform/linux-generic/odp_chksum.c index a792971ef..484b2b0ae 100644 --- a/platform/linux-generic/odp_chksum.c +++ b/platform/linux-generic/odp_chksum.c @@ -7,26 +7,14 @@ #include <odp/api/chksum.h> #include <odp/api/std_types.h> +#include <odp_chksum_internal.h> + /* Simple implementation of ones complement sum. * Based on RFC1071 and its errata. */ uint16_t odp_chksum_ones_comp16(const void *p, uint32_t len) { - uint32_t sum = 0; - const uint16_t *data = p; - - while (len > 1) { - sum += *data++; - len -= 2; - } - - /* Add left-over byte, if any */ - if (len > 0) { - uint16_t left_over = 0; - - *(uint8_t *)&left_over = *(const uint8_t *)data; - sum += left_over; - } + uint32_t sum = _odp_chksum_ones_comp16_32(p, len, false); /* Fold 32-bit sum to 16 bits */ while (sum >> 16)
