APIs for initialising and computing the crc (16-bit and 32-bit CRCs)
are added. For CRCs calculation, scalar as well as x86 intrinsic(sse4.2)
versions are implemented.
The scalar version is based on generic Look-Up Table(LUT) algorithm,
while x86 intrinsic version uses carry-less multiplication for
fast CRC computation.
Signed-off-by: Jasvinder Singh <jasvinder.si...@intel.com>
---
lib/librte_net/Makefile | 2 +
lib/librte_net/rte_net_crc.c | 664 +++++++++++++++++++++++++++++++++++++
lib/librte_net/rte_net_crc.h | 101 ++++++
lib/librte_net/rte_net_version.map | 8 +
4 files changed, 775 insertions(+)
create mode 100644 lib/librte_net/rte_net_crc.c
create mode 100644 lib/librte_net/rte_net_crc.h
diff --git a/lib/librte_net/Makefile b/lib/librte_net/Makefile
index 20cf664..41be751 100644
--- a/lib/librte_net/Makefile
+++ b/lib/librte_net/Makefile
@@ -39,11 +39,13 @@ EXPORT_MAP := rte_net_version.map
LIBABIVER := 1
SRCS-$(CONFIG_RTE_LIBRTE_NET) := rte_net.c
+SRCS-$(CONFIG_RTE_LIBRTE_NET) += rte_net_crc.c
# install includes
SYMLINK-$(CONFIG_RTE_LIBRTE_NET)-include := rte_ip.h rte_tcp.h rte_udp.h
SYMLINK-$(CONFIG_RTE_LIBRTE_NET)-include += rte_sctp.h rte_icmp.h rte_arp.h
SYMLINK-$(CONFIG_RTE_LIBRTE_NET)-include += rte_ether.h rte_gre.h rte_net.h
+SYMLINK-$(CONFIG_RTE_LIBRTE_NET)-include += rte_net_crc.h
DEPDIRS-$(CONFIG_RTE_LIBRTE_NET) += lib/librte_eal lib/librte_mbuf
diff --git a/lib/librte_net/rte_net_crc.c b/lib/librte_net/rte_net_crc.c
new file mode 100644
index 0000000..78a49dd
--- /dev/null
+++ b/lib/librte_net/rte_net_crc.c
@@ -0,0 +1,664 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2017 Intel Corporation.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <rte_net_crc.h>
+#include <stddef.h>
+
+/* Macros for printing using RTE_LOG */
+#define RTE_LOGTYPE_CRC RTE_LOGTYPE_USER1
+
+/** CRC polynomials */
+#define CRC32_ETH_POLYNOMIAL 0x04c11db7UL
+#define CRC16_CCITT_POLYNOMIAL 0x1021U
+
+typedef int (*rte_net_crc_handler)(struct rte_net_crc_params *);
+
+static int rte_crc16_ccitt_handler(struct rte_net_crc_params *p);
+static int rte_crc32_eth_handler(struct rte_net_crc_params *p);
+static int rte_crc_invalid_handler(struct rte_net_crc_params *p);
+
+static rte_net_crc_handler *handlers;
+
+static rte_net_crc_handler handlers_scalar[] = {
+ [RTE_NET_CRC16_CCITT] = rte_crc16_ccitt_handler,
+ [RTE_NET_CRC32_ETH] = rte_crc32_eth_handler,
+ [RTE_NET_CRC_REQS] = rte_crc_invalid_handler,
+};
+
+int
+rte_crc_invalid_handler(__rte_unused struct rte_net_crc_params *p)
+{
+ RTE_LOG(ERR, CRC, "CRC type not supported!\n");
+ return -1; /* Error */
+}
+
+#if defined RTE_ARCH_X86_64 && defined RTE_MACHINE_CPUFLAG_SSE4_2
+
+#include <cpuid.h>
+
+/** PCLMULQDQ CRC computation context structure */
+struct crc_pclmulqdq_ctx {
+ __m128i rk1_rk2;
+ __m128i rk5_rk6;
+ __m128i rk7_rk8;
+};
+
+struct crc_pclmulqdq_ctx crc32_eth_pclmulqdq __rte_aligned(16);
+struct crc_pclmulqdq_ctx crc16_ccitt_pclmulqdq __rte_aligned(16);
+/**
+ * @brief Performs one folding round
+ *
+ * Logically function operates as follows:
+ * DATA = READ_NEXT_16BYTES();
+ * F1 = LSB8(FOLD)
+ * F2 = MSB8(FOLD)
+ * T1 = CLMUL(F1, RK1)
+ * T2 = CLMUL(F2, RK2)
+ * FOLD = XOR(T1, T2, DATA)
+ *
+ * @param data_block 16 byte data block
+ * @param precomp precomputed rk1 constanst
+ * @param fold running 16 byte folded data
+ *
+ * @return New 16 byte folded data
+ */
+static inline __attribute__((always_inline)) __m128i
+crcr32_folding_round(const __m128i data_block,
+ const __m128i precomp,
+ const __m128i fold)
+{
+ __m128i tmp0 = _mm_clmulepi64_si128(fold, precomp, 0x01);
+ __m128i tmp1 = _mm_clmulepi64_si128(fold, precomp, 0x10);
+
+ return _mm_xor_si128(tmp1, _mm_xor_si128(data_block, tmp0));
+}
+
+/**
+ * Performs reduction from 128 bits to 64 bits
+ *
+ * @param data128 128 bits data to be reduced
+ * @param precomp rk5 and rk6 precomputed constants
+ *
+ * @return data reduced to 64 bits
+ */
+
+static inline __attribute__((always_inline)) __m128i
+crcr32_reduce_128_to_64(__m128i data128,
+ const __m128i precomp)
+{
+ __m128i tmp0, tmp1, tmp2;
+
+ /* 64b fold */
+ tmp0 = _mm_clmulepi64_si128(data128, precomp, 0x00);
+ tmp1 = _mm_srli_si128(data128, 8);
+ tmp0 = _mm_xor_si128(tmp0, tmp1);
+
+ /* 32b fold */
+ tmp2 = _mm_slli_si128(tmp0, 4);
+ tmp1 = _mm_clmulepi64_si128(tmp2, precomp, 0x10);
+
+ return _mm_xor_si128(tmp1, tmp0);
+}
+
+/**
+ * Performs Barret's reduction from 64 bits to 32 bits
+ *
+ * @param data64 64 bits data to be reduced
+ * @param precomp rk7 precomputed constant
+ *
+ * @return data reduced to 32 bits
+ */
+
+static inline __attribute__((always_inline)) uint32_t
+crcr32_reduce_64_to_32(__m128i data64,
+ const __m128i precomp)
+{
+ static const uint32_t mask1[4] __rte_aligned(16) = {
+ 0xffffffff, 0xffffffff, 0x00000000, 0x00000000
+ };
+
+ static const uint32_t mask2[4] __rte_aligned(16) = {
+ 0x00000000, 0xffffffff, 0xffffffff, 0xffffffff
+ };
+ __m128i tmp0, tmp1, tmp2;
+
+ tmp0 = _mm_and_si128(data64, _mm_load_si128((const __m128i *)mask2));
+
+ tmp1 = _mm_clmulepi64_si128(tmp0, precomp, 0x00);
+ tmp1 = _mm_xor_si128(tmp1, tmp0);
+ tmp1 = _mm_and_si128(tmp1, _mm_load_si128((const __m128i *)mask1));
+
+ tmp2 = _mm_clmulepi64_si128(tmp1, precomp, 0x10);
+ tmp2 = _mm_xor_si128(tmp2, tmp1);
+ tmp2 = _mm_xor_si128(tmp2, tmp0);
+
+ return _mm_extract_epi32(tmp2, 2);
+}
+
+/**
+ * Computes constant for CLMUL algorithm
+ *
+ * Result is: X^exp mod poly
+ *
+ * @param poly polynomial
+ * @param exp exponent
+ *
+ * @return constant value
+ */
+
+static inline uint32_t
+get_poly_constant(const uint32_t poly, const uint32_t exp)
+{
+ uint32_t i, res = poly;
+
+ for (i = 32; i < exp; i++)
+ if (res & 0x80000000)
+ res = (res << 1) ^ poly;
+ else
+ res = (res << 1);
+
+ return res;
+}
+
+/**
+ * Calculates quotient and reminder of X^64 / P(X)
+ *
+ * @param poly P(X)
+ * @param q_ptr place to store quotient
+ * @param r_ptr place to store reminder
+ */
+static inline void
+div_poly(const uint64_t poly,
+ uint64_t *q_ptr,
+ uint64_t *r_ptr)
+{
+ uint64_t p = 0, q = 0, r = 0;
+ int i;
+
+ p = poly | 0x100000000ULL;
+
+ r = p;
+ r = r << 32;
+
+ i = 32;
+ do {
+ uint64_t one_shl_n = 0;
+
+ q = q << 1;
+ if ((i + 32) < 64)
+ one_shl_n = 1ULL << (32 + i);
+
+ if (r & one_shl_n) {
+ r ^= (p << i);
+ q |= 1;
+ }
+ i--;
+ } while (i >= 0);
+
+ if (q_ptr != NULL)
+ *q_ptr = q;
+
+ if (r_ptr != NULL)
+ *r_ptr = r;
+}
+
+/**
+ * Reflects selected group of bits in \a v
+ *
+ * @param v value to be reflected
+ * @param n size of the bit field to be reflected
+ *
+ * @return bit reflected value
+ */
+static uint64_t
+reflect(uint64_t v, const uint32_t n)
+{
+ uint32_t i;
+ uint64_t r = 0;
+
+ for (i = 0; i < n; i++) {
+ if (i != 0) {
+ r <<= 1;
+ v >>= 1;
+ }
+ r |= (v & 1);
+ }
+
+ return r;
+}
+
+const uint8_t crc_xmm_shift_tab[48] __rte_aligned(16) = {
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+ 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
+};
+
+/**
+ * Shifts left 128 bit register by specified number of bytes
+ *
+ * @param reg 128 bit value
+ * @param num number of bytes to shift left reg by (0-16)
+ *
+ * @return reg << (num * 8)
+ */
+
+static inline __attribute__((always_inline)) __m128i
+xmm_shift_left(__m128i reg, const unsigned int num)
+{
+ const __m128i *p = (const __m128i *)(crc_xmm_shift_tab + 16 - num);
+
+ return _mm_shuffle_epi8(reg, _mm_loadu_si128(p));
+}
+
+/**
+ * Initializes CRC computation context structure for given polynomial
+ *
+ * @param pctx plcmulqdq CRC computation context structure to be initialized
+ * @param poly CRC polynomial
+ *
+ * return 0 on success, -1 otherwise
+ */
+static inline __attribute__((always_inline)) int
+crc32_eth_init_pclmulqdq(
+ struct crc_pclmulqdq_ctx *pctx,
+ const uint64_t poly)
+{
+ uint64_t k1, k2, k5, k6;
+ uint64_t p = 0, q = 0;
+
+ if (pctx == NULL)
+ return -1;
+
+ k1 = get_poly_constant(poly, 128 - 32);
+ k2 = get_poly_constant(poly, 128 + 32);
+ k5 = get_poly_constant(poly, 96);
+ k6 = get_poly_constant(poly, 64);
+
+ div_poly(poly, &q, NULL);
+ q = q & 0xffffffff; /** quotient X^64 / P(X) */
+ p = poly | 0x100000000ULL; /** P(X) */
+
+ k1 = reflect(k1 << 32, 64) << 1;
+ k2 = reflect(k2 << 32, 64) << 1;
+ k5 = reflect(k5 << 32, 64) << 1;
+ k6 = reflect(k6 << 32, 64) << 1;
+ q = reflect(q, 33);
+ p = reflect(p, 33);
+
+ /** Save the params in context structure */
+ pctx->rk1_rk2 = _mm_setr_epi64(_m_from_int64(k1), _m_from_int64(k2));
+ pctx->rk5_rk6 = _mm_setr_epi64(_m_from_int64(k5), _m_from_int64(k6));
+ pctx->rk7_rk8 = _mm_setr_epi64(_m_from_int64(q), _m_from_int64(p));
+
+ return 0;
+}
+
+static inline __attribute__((always_inline)) uint32_t
+crc32_eth_calc_pclmulqdq(
+ const uint8_t *data,
+ uint32_t data_len,
+ uint32_t crc,
+ const struct crc_pclmulqdq_ctx *params)
+{
+ __m128i temp, fold, k;
+ uint32_t n;
+
+ if (unlikely(data == NULL))
+ return crc;
+
+ if (unlikely(data_len == 0))
+ return crc;
+
+ if (unlikely(params == NULL))
+ return crc;
+
+ /* Get CRC init value */
+ temp = _mm_insert_epi32(_mm_setzero_si128(), crc, 0);
+
+ /**
+ * Folding all data into single 16 byte data block
+ * Assumes: fold holds first 16 bytes of data
+ */
+
+ if (unlikely(data_len < 32)) {
+ if (unlikely(data_len == 16)) {
+ /* 16 bytes */
+ fold = _mm_loadu_si128((const __m128i *)data);
+ fold = _mm_xor_si128(fold, temp);
+ goto reduction_128_64;
+ }
+
+ if (unlikely(data_len < 16)) {
+ /* 0 to 15 bytes */
+ uint8_t buffer[16] __rte_aligned(16);
+
+ memset(buffer, 0, sizeof(buffer));
+ memcpy(buffer, data, data_len);
+
+ fold = _mm_load_si128((const __m128i *)buffer);
+ fold = _mm_xor_si128(fold, temp);
+ if (unlikely(data_len < 4)) {
+ fold = xmm_shift_left(fold, 8 - data_len);
+ goto barret_reduction;
+ }
+ fold = xmm_shift_left(fold, 16 - data_len);
+ goto reduction_128_64;
+ }
+ /* 17 to 31 bytes */
+ fold = _mm_loadu_si128((const __m128i *)data);
+ fold = _mm_xor_si128(fold, temp);
+ n = 16;
+ k = params->rk1_rk2;
+ goto partial_bytes;
+ }
+
+ /** At least 32 bytes in the buffer */
+ /** Apply CRC initial value */
+ fold = _mm_loadu_si128((const __m128i *)data);
+ fold = _mm_xor_si128(fold, temp);
+
+ /** Main folding loop - the last 16 bytes is processed separately */
+ k = params->rk1_rk2;
+ for (n = 16; (n + 16) <= data_len; n += 16) {
+ temp = _mm_loadu_si128((const __m128i *)&data[n]);
+ fold = crcr32_folding_round(temp, k, fold);
+ }
+
+partial_bytes:
+ if (likely(n < data_len)) {
+
+ const uint32_t mask3[4] __rte_aligned(16) = {
+ 0x80808080, 0x80808080, 0x80808080, 0x80808080
+ };
+
+ const uint8_t shf_table[32] __rte_aligned(16) = {
+ 0x00, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
+ 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
+ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+ 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f
+ };
+
+ __m128i last16, a, b;
+
+ last16 = _mm_loadu_si128((const __m128i *)&data[data_len - 16]);
+
+ temp = _mm_loadu_si128((const __m128i *)
+ &shf_table[data_len & 15]);
+ a = _mm_shuffle_epi8(fold, temp);
+
+ temp = _mm_xor_si128(temp,
+ _mm_load_si128((const __m128i *)mask3));
+ b = _mm_shuffle_epi8(fold, temp);
+ b = _mm_blendv_epi8(b, last16, temp);
+
+ /* k = rk1 & rk2 */
+ temp = _mm_clmulepi64_si128(a, k, 0x01);
+ fold = _mm_clmulepi64_si128(a, k, 0x10);
+
+ fold = _mm_xor_si128(fold, temp);
+ fold = _mm_xor_si128(fold, b);
+ }
+
+ /** Reduction 128 -> 32 Assumes: fold holds 128bit folded data */
+reduction_128_64:
+ k = params->rk5_rk6;
+ fold = crcr32_reduce_128_to_64(fold, k);
+
+barret_reduction:
+ k = params->rk7_rk8;
+ n = crcr32_reduce_64_to_32(fold, k);
+
+ return n;
+}
+
+
+static int
+rte_net_crc_sse42_init(void)
+{
+ int status = 0;
+
+ /** Initialize CRC functions */
+ status = crc32_eth_init_pclmulqdq(&crc16_ccitt_pclmulqdq,
+ CRC16_CCITT_POLYNOMIAL << 16);
+ if (status == -1)
+ return -1;
+
+ status = crc32_eth_init_pclmulqdq(&crc32_eth_pclmulqdq,
+ CRC32_ETH_POLYNOMIAL);
+ if (status == -1)
+ return -1;
+
+ _mm_empty();
+
+ return 0;
+}
+
+static inline int
+rte_crc16_ccitt_sse42_handler(struct rte_net_crc_params *p)
+{
+ uint16_t ret;
+ const uint8_t *data =
+ rte_pktmbuf_mtod_offset(p->mbuf, uint8_t *, p->data_offset);
+
+ ret = (uint16_t)~crc32_eth_calc_pclmulqdq(data,
+ p->data_len,
+ 0xffff,
+ &crc16_ccitt_pclmulqdq);
+
+ return ret;
+}
+
+static inline int
+rte_crc32_eth_sse42_handler(struct rte_net_crc_params *p)
+{
+ uint32_t ret;
+ const uint8_t *data =
+ rte_pktmbuf_mtod_offset(p->mbuf, uint8_t *, p->data_offset);
+
+ ret = ~crc32_eth_calc_pclmulqdq(data,
+ p->data_len,
+ 0xffffffffUL,
+ &crc32_eth_pclmulqdq);
+
+ return ret;
+}
+
+static rte_net_crc_handler handlers_sse42[] = {
+ [RTE_NET_CRC16_CCITT] = rte_crc16_ccitt_sse42_handler,
+ [RTE_NET_CRC32_ETH] = rte_crc32_eth_sse42_handler,
+ [RTE_NET_CRC_REQS] = rte_crc_invalid_handler,
+};
+
+#endif
+
+/** Local data */
+static uint32_t crc32_eth_lut[256];
+static uint32_t crc16_ccitt_lut[256];
+
+/**
+ * @brief Reflect the bits about the middle
+ *
+ * @param x value to be reflected
+ *
+ * @return reflected value
+ */
+static uint32_t
+reflect_32bits(const uint32_t val)
+{
+ uint32_t i, res = 0;
+
+ for (i = 0; i < 32; i++)
+ if ((val & (1 << i)) != 0)
+ res |= (uint32_t)(1 << (31 - i));
+
+ return res;
+}
+
+static int
+crc32_eth_init_lut(const uint32_t poly,
+ uint32_t *lut)
+{
+ uint_fast32_t i, j;
+
+ if (lut == NULL)
+ return -1;
+
+ for (i = 0; i < 256; i++) {
+ uint_fast32_t crc = reflect_32bits(i);
+
+ for (j = 0; j < 8; j++) {
+ if (crc & 0x80000000L)
+ crc = (crc << 1) ^ poly;
+ else
+ crc <<= 1;
+ }
+ lut[i] = reflect_32bits(crc);
+ }
+
+ return 0;
+}
+
+static inline __attribute__((always_inline)) uint32_t
+crc32_eth_calc_lut(const uint8_t *data,
+ uint32_t data_len,
+ uint32_t crc,
+ const uint32_t *lut)
+{
+ if (unlikely(data == NULL || lut == NULL))
+ return crc;
+
+ while (data_len--)
+ crc = lut[(crc ^ *data++) & 0xffL] ^ (crc >> 8);
+
+ return crc;
+}
+
+static int
+rte_net_crc_scalar_init(void)
+{
+ int status = 0;
+
+ /** 32-bit crc init */
+ status = crc32_eth_init_lut(CRC32_ETH_POLYNOMIAL,
+ crc32_eth_lut);
+ if (status == -1)
+ return -1;
+
+ /** 16-bit CRC init */
+ status = crc32_eth_init_lut(CRC16_CCITT_POLYNOMIAL << 16,
+ crc16_ccitt_lut);
+ if (status == -1)
+ return -1;
+
+ return 0;
+}
+
+static inline int
+rte_crc16_ccitt_handler(struct rte_net_crc_params *p)
+{
+ uint16_t ret;
+ const uint8_t *data =
+ rte_pktmbuf_mtod_offset(p->mbuf, uint8_t *, p->data_offset);
+
+ ret = (uint16_t)~crc32_eth_calc_lut(data,
+ p->data_len,
+ 0xffff,
+ crc16_ccitt_lut);
+
+ return ret;
+}
+
+static inline int
+rte_crc32_eth_handler(struct rte_net_crc_params *p)
+{
+ uint32_t ret;
+ const uint8_t *data =
+ rte_pktmbuf_mtod_offset(p->mbuf, uint8_t *, p->data_offset);
+
+ ret = ~crc32_eth_calc_lut(data,
+ p->data_len,
+ 0xffffffffUL,
+ crc32_eth_lut);
+
+ return ret;
+}
+
+int
+rte_net_crc_init(enum rte_net_crc_mode m)
+{
+ int status;
+
+ switch (m) {
+
+ case RTE_NET_CRC_SSE42:
+#ifdef RTE_ARCH_X86_64
+ if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_SSE4_2)) {
+ status = rte_net_crc_sse42_init();
+ handlers = handlers_sse42;
+ } else {
+ status = -1;
+ RTE_LOG(ERR, CRC,
+ "bad configuration(SSE4.2 not supported!)\n %s",
+ __func__);
+ }
+
+ return status;
+#else
+ RTE_LOG(ERR, CRC,
+ "bad configuration(x86_64 architecure not supported!)\n
%s",
+ __func__);
+ return -1;
+#endif
+ case RTE_NET_CRC_SCALAR:
+ default:
+ status = rte_net_crc_scalar_init();
+ handlers = handlers_scalar;
+
+ return status;
+ }
+}
+
+int
+rte_net_crc_calc(struct rte_net_crc_params *p)
+{
+ int ret;
+ rte_net_crc_handler f_handle;
+
+ f_handle = handlers[p->type];
+ ret = f_handle(p);
+
+ return ret;
+}
diff --git a/lib/librte_net/rte_net_crc.h b/lib/librte_net/rte_net_crc.h
new file mode 100644
index 0000000..accbeea
--- /dev/null
+++ b/lib/librte_net/rte_net_crc.h
@@ -0,0 +1,101 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2017 Intel Corporation.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _RTE_NET_CRC_H_
+#define _RTE_NET_CRC_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+
+#include <rte_mbuf.h>
+
+/** CRC types */
+enum rte_net_crc_type {
+ RTE_NET_CRC16_CCITT = 0,
+ RTE_NET_CRC32_ETH,
+ RTE_NET_CRC_REQS
+};
+
+/** CRC compute mode */
+enum rte_net_crc_mode {
+ RTE_NET_CRC_SCALAR = 0,
+ RTE_NET_CRC_SSE42,
+ RTE_NET_CRC_DEFAULT
+};
+
+/** CRC calc APIs params */
+struct rte_net_crc_params {
+ struct rte_mbuf *mbuf; /**< packet mbuf */
+ uint32_t data_offset; /**< offset to the data */
+ uint32_t data_len; /**< length of the data */
+ enum rte_net_crc_type type; /**< crc type */
+};
+
+/**
+ * CRC Initialisation API
+ *
+ * This API should be called only once to initialise the internal crc
+ * data structue before using CRC compute API.
+ *
+ * @param crc_mode
+ * crc compute mode
+ *
+ * @return
+ * 0 on success, -1 otherwise
+ */
+
+int
+rte_net_crc_init(enum rte_net_crc_mode m);
+
+/**
+ * CRC compute API
+ *
+ * @param
+ * structure rte_net_crc_params
+ *
+ * @return
+ * crc value
+ */
+
+int
+rte_net_crc_calc(struct rte_net_crc_params *p);
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif /* _RTE_NET_CRC_H_ */
diff --git a/lib/librte_net/rte_net_version.map
b/lib/librte_net/rte_net_version.map
index 3b15e65..d391834 100644
--- a/lib/librte_net/rte_net_version.map
+++ b/lib/librte_net/rte_net_version.map
@@ -4,3 +4,11 @@ DPDK_16.11 {
local: *;
};
+
+DPDK_17.05 {
+ global:
+
+ rte_net_crc_init;
+ rte_net_crc_calc;
+
+} DPDK_16.11;
--
2.5.5
