--- /dev/null
+/*
+ * BSD LICENSE
+ *
+ * Copyright (C) Cavium, Inc. 2017.
+ *
+ * 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 Cavium, Inc 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 _NET_CRC_NEON_H_
+#define _NET_CRC_NEON_H_
+
+#include <rte_branch_prediction.h>
+#include <rte_net_crc.h>
+#include <rte_vect.h>
+#include <rte_cpuflags.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** PMULL CRC computation context structure */
+struct crc_pmull_ctx {
+ uint64x2_t rk1_rk2;
+ uint64x2_t rk5_rk6;
+ uint64x2_t rk7_rk8;
+};
+
+struct crc_pmull_ctx crc32_eth_pmull __rte_aligned(16);
+struct crc_pmull_ctx crc16_ccitt_pmull __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 uint64x2_t
+crcr32_folding_round(uint64x2_t data_block, uint64x2_t precomp,
+ uint64x2_t fold)
+{
+ uint64x2_t tmp0 = vreinterpretq_u64_p128(vmull_p64(
+ vgetq_lane_p64(vreinterpretq_p64_u64(fold), 1),
+ vgetq_lane_p64(vreinterpretq_p64_u64(precomp), 0)));
+
+ uint64x2_t tmp1 = vreinterpretq_u64_p128(vmull_p64(
+ vgetq_lane_p64(vreinterpretq_p64_u64(fold), 0),
+ vgetq_lane_p64(vreinterpretq_p64_u64(precomp), 1)));
+
+ return veorq_u64(tmp1, veorq_u64(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 uint64x2_t
+crcr32_reduce_128_to_64(uint64x2_t data128,
+ uint64x2_t precomp)
+{
+ uint64x2_t tmp0, tmp1, tmp2;
+
+ /* 64b fold */
+ tmp0 = vreinterpretq_u64_p128(vmull_p64(
+ vgetq_lane_p64(vreinterpretq_p64_u64(data128), 0),
+ vgetq_lane_p64(vreinterpretq_p64_u64(precomp), 0)));
+ tmp1 = vshift_bytes_right(data128, 8);
+ tmp0 = veorq_u64(tmp0, tmp1);
+
+ /* 32b fold */
+ tmp2 = vshift_bytes_left(tmp0, 4);
+ tmp1 = vreinterpretq_u64_p128(vmull_p64(
+ vgetq_lane_p64(vreinterpretq_p64_u64(tmp2), 0),
+ vgetq_lane_p64(vreinterpretq_p64_u64(precomp), 1)));
+
+ return veorq_u64(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 uint32_t
+crcr32_reduce_64_to_32(uint64x2_t data64,
+ uint64x2_t precomp)
+{
+ static uint32_t mask1[4] __rte_aligned(16) = {
+ 0xffffffff, 0xffffffff, 0x00000000, 0x00000000
+ };
+ static uint32_t mask2[4] __rte_aligned(16) = {
+ 0x00000000, 0xffffffff, 0xffffffff, 0xffffffff
+ };
+ uint64x2_t tmp0, tmp1, tmp2;
+
+ tmp0 = vandq_u64(data64, vld1q_u64((uint64_t *)mask2));
+
+ tmp1 = vreinterpretq_u64_p128(vmull_p64(
+ vgetq_lane_p64(vreinterpretq_p64_u64(tmp0), 0),
+ vgetq_lane_p64(vreinterpretq_p64_u64(precomp), 0)));
+ tmp1 = veorq_u64(tmp1, tmp0);
+ tmp1 = vandq_u64(tmp1, vld1q_u64((uint64_t *)mask1));
+
+ tmp2 = vreinterpretq_u64_p128(vmull_p64(
+ vgetq_lane_p64(vreinterpretq_p64_u64(tmp1), 0),
+ vgetq_lane_p64(vreinterpretq_p64_u64(precomp), 1)));
+ tmp2 = veorq_u64(tmp2, tmp1);
+ tmp2 = veorq_u64(tmp2, tmp0);
+
+ return vgetq_lane_u32(vreinterpretq_u32_u64(tmp2), 2);
+}
+
+static inline uint32_t
+crc32_eth_calc_pmull(
+ const uint8_t *data,
+ uint32_t data_len,
+ uint32_t crc,
+ const struct crc_pmull_ctx *params)
+{
+ uint64x2_t temp, fold, k;
+ uint32_t n;
+
+ /* Get CRC init value */
+ temp = vreinterpretq_u64_u32(vsetq_lane_u32(crc, vmovq_n_u32(0), 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 = vld1q_u64((const uint64_t *)data);
+ fold = veorq_u64(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 = vld1q_u64((uint64_t *)buffer);
+ fold = veorq_u64(fold, temp);
+ if (unlikely(data_len < 4)) {
+ fold = vshift_bytes_left(fold, 8 - data_len);
+ goto barret_reduction;
+ }
+ fold = vshift_bytes_left(fold, 16 - data_len);
+ goto reduction_128_64;
+ }
+ /* 17 to 31 bytes */
+ fold = vld1q_u64((const uint64_t *)data);
+ fold = veorq_u64(fold, temp);
+ n = 16;
+ k = params->rk1_rk2;
+ goto partial_bytes;
+ }
+
+ /** At least 32 bytes in the buffer */
+ /** Apply CRC initial value */
+ fold = vld1q_u64((const uint64_t *)data);
+ fold = veorq_u64(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 = vld1q_u64((const uint64_t *)&data[n]);
+ fold = crcr32_folding_round(temp, k, fold);
+ }
+
+partial_bytes:
+ if (likely(n < data_len)) {
+ uint64x2_t last16, a, b, mask;
+ uint32_t rem = data_len & 15;
+
+ last16 = vld1q_u64((const uint64_t *)&data[data_len - 16]);
+ a = vshift_bytes_left(fold, 16 - rem);
+ b = vshift_bytes_right(fold, rem);
+ mask = vshift_bytes_left(vdupq_n_u64(-1), 16 - rem);
+ b = vorrq_u64(b, vandq_u64(mask, last16));
+
+ /* k = rk1 & rk2 */
+ temp = vreinterpretq_u64_p128(vmull_p64(
+ vgetq_lane_p64(vreinterpretq_p64_u64(a), 1),
+ vgetq_lane_p64(vreinterpretq_p64_u64(k), 0)));
+ fold = vreinterpretq_u64_p128(vmull_p64(
+ vgetq_lane_p64(vreinterpretq_p64_u64(a), 0),
+ vgetq_lane_p64(vreinterpretq_p64_u64(k), 1)));
+ fold = veorq_u64(fold, temp);
+ fold = veorq_u64(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 inline void
+rte_net_crc_neon_init(void)
+{
+ /* Initialize CRC16 data */
+ uint64_t ccitt_k1_k2[2] = {0x189aeLLU, 0x8e10LLU};
+ uint64_t ccitt_k5_k6[2] = {0x189aeLLU, 0x114aaLLU};
+ uint64_t ccitt_k7_k8[2] = {0x11c581910LLU, 0x10811LLU};
+
+ /* Initialize CRC32 data */
+ uint64_t eth_k1_k2[2] = {0xccaa009eLLU, 0x1751997d0LLU};
+ uint64_t eth_k5_k6[2] = {0xccaa009eLLU, 0x163cd6124LLU};
+ uint64_t eth_k7_k8[2] = {0x1f7011640LLU, 0x1db710641LLU};
+
+ /** Save the params in context structure */
+ crc16_ccitt_pmull.rk1_rk2 = vld1q_u64(ccitt_k1_k2);
+ crc16_ccitt_pmull.rk5_rk6 = vld1q_u64(ccitt_k5_k6);
+ crc16_ccitt_pmull.rk7_rk8 = vld1q_u64(ccitt_k7_k8);
+
+ /** Save the params in context structure */
+ crc32_eth_pmull.rk1_rk2 = vld1q_u64(eth_k1_k2);
+ crc32_eth_pmull.rk5_rk6 = vld1q_u64(eth_k5_k6);
+ crc32_eth_pmull.rk7_rk8 = vld1q_u64(eth_k7_k8);
+}
+
+static inline uint32_t
+rte_crc16_ccitt_neon_handler(const uint8_t *data,
+ uint32_t data_len)
+{
+ return (uint16_t)~crc32_eth_calc_pmull(data,
+ data_len,
+ 0xffff,
+ &crc16_ccitt_pmull);
+}
+
+static inline uint32_t
+rte_crc32_eth_neon_handler(const uint8_t *data,
+ uint32_t data_len)
+{
+ return ~crc32_eth_calc_pmull(data,
+ data_len,
+ 0xffffffffUL,
+ &crc32_eth_pmull);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _NET_CRC_NEON_H_ */
Code Review / deb_dpdk.git / blobdiff