path: root/drivers/net/i40e/i40e_rxtx_vec_avx2.c

/*-
 *   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 <stdint.h>
#include <rte_ethdev_driver.h>
#include <rte_malloc.h>

#include "base/i40e_prototype.h"
#include "base/i40e_type.h"
#include "i40e_ethdev.h"
#include "i40e_rxtx.h"
#include "i40e_rxtx_vec_common.h"

#include <x86intrin.h>

#ifndef __INTEL_COMPILER
#pragma GCC diagnostic ignored "-Wcast-qual"
#endif

static inline void
i40e_rxq_rearm(struct i40e_rx_queue *rxq)
{
	int i;
	uint16_t rx_id;
	volatile union i40e_rx_desc *rxdp;
	struct i40e_rx_entry *rxep = &rxq->sw_ring[rxq->rxrearm_start];

	rxdp = rxq->rx_ring + rxq->rxrearm_start;

	/* Pull 'n' more MBUFs into the software ring */
	if (rte_mempool_get_bulk(rxq->mp,
				 (void *)rxep,
				 RTE_I40E_RXQ_REARM_THRESH) < 0) {
		if (rxq->rxrearm_nb + RTE_I40E_RXQ_REARM_THRESH >=
		    rxq->nb_rx_desc) {
			__m128i dma_addr0;
			dma_addr0 = _mm_setzero_si128();
			for (i = 0; i < RTE_I40E_DESCS_PER_LOOP; i++) {
				rxep[i].mbuf = &rxq->fake_mbuf;
				_mm_store_si128((__m128i *)&rxdp[i].read,
						dma_addr0);
			}
		}
		rte_eth_devices[rxq->port_id].data->rx_mbuf_alloc_failed +=
			RTE_I40E_RXQ_REARM_THRESH;
		return;
	}

#ifndef RTE_LIBRTE_I40E_16BYTE_RX_DESC
	struct rte_mbuf *mb0, *mb1;
	__m128i dma_addr0, dma_addr1;
	__m128i hdr_room = _mm_set_epi64x(RTE_PKTMBUF_HEADROOM,
			RTE_PKTMBUF_HEADROOM);
	/* Initialize the mbufs in vector, process 2 mbufs in one loop */
	for (i = 0; i < RTE_I40E_RXQ_REARM_THRESH; i += 2, rxep += 2) {
		__m128i vaddr0, vaddr1;

		mb0 = rxep[0].mbuf;
		mb1 = rxep[1].mbuf;

		/* load buf_addr(lo 64bit) and buf_physaddr(hi 64bit) */
		RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, buf_physaddr) !=
				offsetof(struct rte_mbuf, buf_addr) + 8);
		vaddr0 = _mm_loadu_si128((__m128i *)&mb0->buf_addr);
		vaddr1 = _mm_loadu_si128((__m128i *)&mb1->buf_addr);

		/* convert pa to dma_addr hdr/data */
		dma_addr0 = _mm_unpackhi_epi64(vaddr0, vaddr0);
		dma_addr1 = _mm_unpackhi_epi64(vaddr1, vaddr1);

		/* add headroom to pa values */
		dma_addr0 = _mm_add_epi64(dma_addr0, hdr_room);
		dma_addr1 = _mm_add_epi64(dma_addr1, hdr_room);

		/* flush desc with pa dma_addr */
		_mm_store_si128((__m128i *)&rxdp++->read, dma_addr0);
		_mm_store_si128((__m128i *)&rxdp++->read, dma_addr1);
	}
#else
	struct rte_mbuf *mb0, *mb1, *mb2, *mb3;
	__m256i dma_addr0_1, dma_addr2_3;
	__m256i hdr_room = _mm256_set1_epi64x(RTE_PKTMBUF_HEADROOM);
	/* Initialize the mbufs in vector, process 4 mbufs in one loop */
	for (i = 0; i < RTE_I40E_RXQ_REARM_THRESH;
			i += 4, rxep += 4, rxdp += 4) {
		__m128i vaddr0, vaddr1, vaddr2, vaddr3;
		__m256i vaddr0_1, vaddr2_3;

		mb0 = rxep[0].mbuf;
		mb1 = rxep[1].mbuf;
		mb2 = rxep[2].mbuf;
		mb3 = rxep[3].mbuf;

		/* load buf_addr(lo 64bit) and buf_physaddr(hi 64bit) */
		RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, buf_physaddr) !=
				offsetof(struct rte_mbuf, buf_addr) + 8);
		vaddr0 = _mm_loadu_si128((__m128i *)&mb0->buf_addr);
		vaddr1 = _mm_loadu_si128((__m128i *)&mb1->buf_addr);
		vaddr2 = _mm_loadu_si128((__m128i *)&mb2->buf_addr);
		vaddr3 = _mm_loadu_si128((__m128i *)&mb3->buf_addr);

		/*
		 * merge 0 & 1, by casting 0 to 256-bit and inserting 1
		 * into the high lanes. Similarly for 2 & 3
		 */
		vaddr0_1 = _mm256_inserti128_si256(
				_mm256_castsi128_si256(vaddr0), vaddr1, 1);
		vaddr2_3 = _mm256_inserti128_si256(
				_mm256_castsi128_si256(vaddr2), vaddr3, 1);

		/* convert pa to dma_addr hdr/data */
		dma_addr0_1 = _mm256_unpackhi_epi64(vaddr0_1, vaddr0_1);
		dma_addr2_3 = _mm256_unpackhi_epi64(vaddr2_3, vaddr2_3);

		/* add headroom to pa values */
		dma_addr0_1 = _mm256_add_epi64(dma_addr0_1, hdr_room);
		dma_addr2_3 = _mm256_add_epi64(dma_addr2_3, hdr_room);

		/* flush desc with pa dma_addr */
		_mm256_store_si256((__m256i *)&rxdp->read, dma_addr0_1);
		_mm256_store_si256((__m256i *)&(rxdp + 2)->read, dma_addr2_3);
	}

#endif

	rxq->rxrearm_start += RTE_I40E_RXQ_REARM_THRESH;
	if (rxq->rxrearm_start >= rxq->nb_rx_desc)
		rxq->rxrearm_start = 0;

	rxq->rxrearm_nb -= RTE_I40E_RXQ_REARM_THRESH;

	rx_id = (uint16_t)((rxq->rxrearm_start == 0) ?
			     (rxq->nb_rx_desc - 1) : (rxq->rxrearm_start - 1));

	/* Update the tail pointer on the NIC */
	I40E_PCI_REG_WRITE(rxq->qrx_tail, rx_id);
}

#define PKTLEN_SHIFT     10

static inline uint16_t
_recv_raw_pkts_vec_avx2(struct i40e_rx_queue *rxq, struct rte_mbuf **rx_pkts,
		uint16_t nb_pkts, uint8_t *split_packet)
{
#define RTE_I40E_DESCS_PER_LOOP_AVX 8

	const uint32_t *ptype_tbl = rxq->vsi->adapter->ptype_tbl;
	const __m256i mbuf_init = _mm256_set_epi64x(0, 0,
			0, rxq->mbuf_initializer);
	struct i40e_rx_entry *sw_ring = &rxq->sw_ring[rxq->rx_tail];
	volatile union i40e_rx_desc *rxdp = rxq->rx_ring + rxq->rx_tail;
	const int avx_aligned = ((rxq->rx_tail & 1) == 0);
	rte_prefetch0(rxdp);

	/* nb_pkts has to be floor-aligned to RTE_I40E_DESCS_PER_LOOP_AVX */
	nb_pkts = RTE_ALIGN_FLOOR(nb_pkts, RTE_I40E_DESCS_PER_LOOP_AVX);

	/* See if we need to rearm the RX queue - gives the prefetch a bit
	 * of time to act
	 */
	if (rxq->rxrearm_nb > RTE_I40E_RXQ_REARM_THRESH)
		i40e_rxq_rearm(rxq);

	/* Before we start moving massive data around, check to see if
	 * there is actually a packet available
	 */
	if (!(rxdp->wb.qword1.status_error_len &
			rte_cpu_to_le_32(1 << I40E_RX_DESC_STATUS_DD_SHIFT)))
		return 0;

	/* constants used in processing loop */
	const __m256i crc_adjust = _mm256_set_epi16(
			/* first descriptor */
			0, 0, 0,       /* ignore non-length fields */
			-rxq->crc_len, /* sub crc on data_len */
			0,             /* ignore high-16bits of pkt_len */
			-rxq->crc_len, /* sub crc on pkt_len */
			0, 0,          /* ignore pkt_type field */
			/* second descriptor */
			0, 0, 0,       /* ignore non-length fields */
			-rxq->crc_len, /* sub crc on data_len */
			0,             /* ignore high-16bits of pkt_len */
			-rxq->crc_len, /* sub crc on pkt_len */
			0, 0           /* ignore pkt_type field */
	);

	/* 8 packets DD mask, LSB in each 32-bit value */
	const __m256i dd_check = _mm256_set1_epi32(1);

	/* 8 packets EOP mask, second-LSB in each 32-bit value */
	const __m256i eop_check = _mm256_slli_epi32(dd_check,
			I40E_RX_DESC_STATUS_EOF_SHIFT);

	/* mask to shuffle from desc. to mbuf (2 descriptors)*/
	const __m256i shuf_msk = _mm256_set_epi8(
			/* first descriptor */
			7, 6, 5, 4,  /* octet 4~7, 32bits rss */
			3, 2,        /* octet 2~3, low 16 bits vlan_macip */
			15, 14,      /* octet 15~14, 16 bits data_len */
			0xFF, 0xFF,  /* skip high 16 bits pkt_len, zero out */
			15, 14,      /* octet 15~14, low 16 bits pkt_len */
			0xFF, 0xFF,  /* pkt_type set as unknown */
			0xFF, 0xFF,  /*pkt_type set as unknown */
			/* second descriptor */
			7, 6, 5, 4,  /* octet 4~7, 32bits rss */
			3, 2,        /* octet 2~3, low 16 bits vlan_macip */
			15, 14,      /* octet 15~14, 16 bits data_len */
			0xFF, 0xFF,  /* skip high 16 bits pkt_len, zero out */
			15, 14,      /* octet 15~14, low 16 bits pkt_len */
			0xFF, 0xFF,  /* pkt_type set as unknown */
			0xFF, 0xFF   /*pkt_type set as unknown */
	);
	/*
	 * compile-time check the above crc and shuffle layout is correct.
	 * NOTE: the first field (lowest address) is given last in set_epi
	 * calls above.
	 */
	RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, pkt_len) !=
			offsetof(struct rte_mbuf, rx_descriptor_fields1) + 4);
	RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, data_len) !=
			offsetof(struct rte_mbuf, rx_descriptor_fields1) + 8);
	RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, vlan_tci) !=
			offsetof(struct rte_mbuf, rx_descriptor_fields1) + 10);
	RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, hash) !=
			offsetof(struct rte_mbuf, rx_descriptor_fields1) + 12);

	/* Status/Error flag masks */
	/*
	 * mask everything except RSS, flow director and VLAN flags
	 * bit2 is for VLAN tag, bit11 for flow director indication
	 * bit13:12 for RSS indication. Bits 3-5 of error
	 * field (bits 22-24) are for IP/L4 checksum errors
	 */
	const __m256i flags_mask = _mm256_set1_epi32(
			(1 << 2) | (1 << 11) | (3 << 12) | (7 << 22));
	/*
	 * data to be shuffled by result of flag mask. If VLAN bit is set,
	 * (bit 2), then position 4 in this array will be used in the
	 * destination
	 */
	const __m256i vlan_flags_shuf = _mm256_set_epi32(
			0, 0, PKT_RX_VLAN | PKT_RX_VLAN_STRIPPED, 0,
			0, 0, PKT_RX_VLAN | PKT_RX_VLAN_STRIPPED, 0);
	/*
	 * data to be shuffled by result of flag mask, shifted down 11.
	 * If RSS/FDIR bits are set, shuffle moves appropriate flags in
	 * place.
	 */
	const __m256i rss_flags_shuf = _mm256_set_epi8(
			0, 0, 0, 0, 0, 0, 0, 0,
			PKT_RX_RSS_HASH | PKT_RX_FDIR, PKT_RX_RSS_HASH, 0, 0,
			0, 0, PKT_RX_FDIR, 0, /* end up 128-bits */
			0, 0, 0, 0, 0, 0, 0, 0,
			PKT_RX_RSS_HASH | PKT_RX_FDIR, PKT_RX_RSS_HASH, 0, 0,
			0, 0, PKT_RX_FDIR, 0);

	/*
	 * data to be shuffled by the result of the flags mask shifted by 22
	 * bits.  This gives use the l3_l4 flags.
	 */
	const __m256i l3_l4_flags_shuf = _mm256_set_epi8(0, 0, 0, 0, 0, 0, 0, 0,
			/* shift right 1 bit to make sure it not exceed 255 */
			(PKT_RX_EIP_CKSUM_BAD | PKT_RX_L4_CKSUM_BAD | PKT_RX_IP_CKSUM_BAD) >> 1,
			(PKT_RX_IP_CKSUM_GOOD | PKT_RX_EIP_CKSUM_BAD | PKT_RX_L4_CKSUM_BAD) >> 1,
			(PKT_RX_EIP_CKSUM_BAD | PKT_RX_IP_CKSUM_BAD) >> 1,
			(PKT_RX_IP_CKSUM_GOOD | PKT_RX_EIP_CKSUM_BAD) >> 1,
			(PKT_RX_L4_CKSUM_BAD | PKT_RX_IP_CKSUM_BAD) >> 1,
			(PKT_RX_IP_CKSUM_GOOD | PKT_RX_L4_CKSUM_BAD) >> 1,
			PKT_RX_IP_CKSUM_BAD >> 1,
			(PKT_RX_IP_CKSUM_GOOD | PKT_RX_L4_CKSUM_GOOD) >> 1,
			/* second 128-bits */
			0, 0, 0, 0, 0, 0, 0, 0,
			(PKT_RX_EIP_CKSUM_BAD | PKT_RX_L4_CKSUM_BAD | PKT_RX_IP_CKSUM_BAD) >> 1,
			(PKT_RX_IP_CKSUM_GOOD | PKT_RX_EIP_CKSUM_BAD | PKT_RX_L4_CKSUM_BAD) >> 1,
			(PKT_RX_EIP_CKSUM_BAD | PKT_RX_IP_CKSUM_BAD) >> 1,
			(PKT_RX_IP_CKSUM_GOOD | PKT_RX_EIP_CKSUM_BAD) >> 1,
			(PKT_RX_L4_CKSUM_BAD | PKT_RX_IP_CKSUM_BAD) >> 1,
			(PKT_RX_IP_CKSUM_GOOD | PKT_RX_L4_CKSUM_BAD) >> 1,
			PKT_RX_IP_CKSUM_BAD >> 1,
			(PKT_RX_IP_CKSUM_GOOD | PKT_RX_L4_CKSUM_GOOD) >> 1);

	const __m256i cksum_mask = _mm256_set1_epi32(
			PKT_RX_IP_CKSUM_GOOD | PKT_RX_IP_CKSUM_BAD |
			PKT_RX_L4_CKSUM_GOOD | PKT_RX_L4_CKSUM_BAD |
			PKT_RX_EIP_CKSUM_BAD);

	RTE_SET_USED(avx_aligned); /* for 32B descriptors we don't use this */

	uint16_t i, received;
	for (i = 0, received = 0; i < nb_pkts;
			i += RTE_I40E_DESCS_PER_LOOP_AVX,
			rxdp += RTE_I40E_DESCS_PER_LOOP_AVX) {
		/* step 1, copy over 8 mbuf pointers to rx_pkts array */
		_mm256_storeu_si256((void *)&rx_pkts[i],
				_mm256_loadu_si256((void *)&sw_ring[i]));
#ifdef RTE_ARCH_X86_64
		_mm256_storeu_si256((void *)&rx_pkts[i + 4],
				_mm256_loadu_si256((void *)&sw_ring[i + 4]));
#endif

		__m256i raw_desc0_1, raw_desc2_3, raw_desc4_5, raw_desc6_7;
#ifdef RTE_LIBRTE_I40E_16BYTE_RX_DESC
		/* for AVX we need alignment otherwise loads are not atomic */
		if (avx_aligned) {
			/* load in descriptors, 2 at a time, in reverse order */
			raw_desc6_7 = _mm256_load_si256((void *)(rxdp + 6));
			rte_compiler_barrier();
			raw_desc4_5 = _mm256_load_si256((void *)(rxdp + 4));
			rte_compiler_barrier();
			raw_desc2_3 = _mm256_load_si256((void *)(rxdp + 2));
			rte_compiler_barrier();
			raw_desc0_1 = _mm256_load_si256((void *)(rxdp + 0));
		} else
#endif
		do {
			const __m128i raw_desc7 = _mm_load_si128((void *)(rxdp + 7));
			rte_compiler_barrier();
			const __m128i raw_desc6 = _mm_load_si128((void *)(rxdp + 6));
			rte_compiler_barrier();
			const __m128i raw_desc5 = _mm_load_si128((void *)(rxdp + 5));
			rte_compiler_barrier();
			const __m128i raw_desc4 = _mm_load_si128((void *)(rxdp + 4));
			rte_compiler_barrier();
			const __m128i raw_desc3 = _mm_load_si128((void *)(rxdp + 3));
			rte_compiler_barrier();
			const __m128i raw_desc2 = _mm_load_si128((void *)(rxdp + 2));
			rte_compiler_barrier();
			const __m128i raw_desc1 = _mm_load_si128((void *)(rxdp + 1));
			rte_compiler_barrier();
			const __m128i raw_desc0 = _mm_load_si128((void *)(rxdp + 0));

			raw_desc6_7 = _mm256_inserti128_si256(
					_mm256_castsi128_si256(raw_desc6), raw_desc7, 1);
			raw_desc4_5 = _mm256_inserti128_si256(
					_mm256_castsi128_si256(raw_desc4), raw_desc5, 1);
			raw_desc2_3 = _mm256_inserti128_si256(
					_mm256_castsi128_si256(raw_desc2), raw_desc3, 1);
			raw_desc0_1 = _mm256_inserti128_si256(
					_mm256_castsi128_si256(raw_desc0), raw_desc1, 1);
		} while (0);

		if (split_packet) {
			int j;
			for (j = 0; j < RTE_I40E_DESCS_PER_LOOP_AVX; j++)
				rte_mbuf_prefetch_part2(rx_pkts[i + j]);
		}

		/*
		 * convert descriptors 4-7 into mbufs, adjusting length and
		 * re-arranging fields. Then write into the mbuf
		 */
		const __m256i len6_7 = _mm256_slli_epi32(raw_desc6_7, PKTLEN_SHIFT);
		const __m256i len4_5 = _mm256_slli_epi32(raw_desc4_5, PKTLEN_SHIFT);
		const __m256i desc6_7 = _mm256_blend_epi16(raw_desc6_7, len6_7, 0x80);
		const __m256i desc4_5 = _mm256_blend_epi16(raw_desc4_5, len4_5, 0x80);
		__m256i mb6_7 = _mm256_shuffle_epi8(desc6_7, shuf_msk);
		__m256i mb4_5 = _mm256_shuffle_epi8(desc4_5, shuf_msk);
		mb6_7 = _mm256_add_epi16(mb6_7, crc_adjust);
		mb4_5 = _mm256_add_epi16(mb4_5, crc_adjust);
		/*
		 * to get packet types, shift 64-bit values down 30 bits
		 * and so ptype is in lower 8-bits in each
		 */
		const __m256i ptypes6_7 = _mm256_srli_epi64(desc6_7, 30);
		const __m256i ptypes4_5 = _mm256_srli_epi64(desc4_5, 30);
		const uint8_t ptype7 = _mm256_extract_epi8(ptypes6_7, 24);
		const uint8_t ptype6 = _mm256_extract_epi8(ptypes6_7, 8);
		const uint8_t ptype5 = _mm256_extract_epi8(ptypes4_5, 24);
		const uint8_t ptype4 = _mm256_extract_epi8(ptypes4_5, 8);
		mb6_7 = _mm256_insert_epi32(mb6_7, ptype_tbl[ptype7], 4);
		mb6_7 = _mm256_insert_epi32(mb6_7, ptype_tbl[ptype6], 0);
		mb4_5 = _mm256_insert_epi32(mb4_5, ptype_tbl[ptype5], 4);
		mb4_5 = _mm256_insert_epi32(mb4_5, ptype_tbl[ptype4], 0);
		/* merge the status bits into one register */
		const __m256i status4_7 = _mm256_unpackhi_epi32(desc6_7,
				desc4_5);

		/*
		 * convert descriptors 0-3 into mbufs, adjusting length and
		 * re-arranging fields. Then write into the mbuf
		 */
		const __m256i len2_3 = _mm256_slli_epi32(raw_desc2_3, PKTLEN_SHIFT);
		const __m256i len0_1 = _mm256_slli_epi32(raw_desc0_1, PKTLEN_SHIFT);
		const __m256i desc2_3 = _mm256_blend_epi16(raw_desc2_3, len2_3, 0x80);
		const __m256i desc0_1 = _mm256_blend_epi16(raw_desc0_1, len0_1, 0x80);
		__m256i mb2_3 = _mm256_shuffle_epi8(desc2_3, shuf_msk);
		__m256i mb0_1 = _mm256_shuffle_epi8(desc0_1, shuf_msk);
		mb2_3 = _mm256_add_epi16(mb2_3, crc_adjust);
		mb0_1 = _mm256_add_epi16(mb0_1, crc_adjust);
		/* get the packet types */
		const __m256i ptypes2_3 = _mm256_srli_epi64(desc2_3, 30);
		const __m256i ptypes0_1 = _mm256_srli_epi64(desc0_1, 30);
		const uint8_t ptype3 = _mm256_extract_epi8(ptypes2_3, 24);
		const uint8_t ptype2 = _mm256_extract_epi8(ptypes2_3, 8);
		const uint8_t ptype1 = _mm256_extract_epi8(ptypes0_1, 24);
		const uint8_t ptype0 = _mm256_extract_epi8(ptypes0_1, 8);
		mb2_3 = _mm256_insert_epi32(mb2_3, ptype_tbl[ptype3], 4);
		mb2_3 = _mm256_insert_epi32(mb2_3, ptype_tbl[ptype2], 0);
		mb0_1 = _mm256_insert_epi32(mb0_1, ptype_tbl[ptype1], 4);
		mb0_1 = _mm256_insert_epi32(mb0_1, ptype_tbl[ptype0], 0);
		/* merge the status bits into one register */
		const __m256i status0_3 = _mm256_unpackhi_epi32(desc2_3,
				desc0_1);

		/*
		 * take the two sets of status bits and merge to one
		 * After merge, the packets status flags are in the
		 * order (hi->lo): [1, 3, 5, 7, 0, 2, 4, 6]
		 */
		__m256i status0_7 = _mm256_unpacklo_epi64(status4_7,
				status0_3);

		/* now do flag manipulation */

		/* get only flag/error bits we want */
		const __m256i flag_bits = _mm256_and_si256(
				status0_7, flags_mask);
		/* set vlan and rss flags */
		const __m256i vlan_flags = _mm256_shuffle_epi8(
				vlan_flags_shuf, flag_bits);
		const __m256i rss_flags = _mm256_shuffle_epi8(
				rss_flags_shuf, _mm256_srli_epi32(flag_bits, 11));
		/*
		 * l3_l4_error flags, shuffle, then shift to correct adjustment
		 * of flags in flags_shuf, and finally mask out extra bits
		 */
		__m256i l3_l4_flags = _mm256_shuffle_epi8(l3_l4_flags_shuf,
				_mm256_srli_epi32(flag_bits, 22));
		l3_l4_flags = _mm256_slli_epi32(l3_l4_flags, 1);
		l3_l4_flags = _mm256_and_si256(l3_l4_flags, cksum_mask);

		/* merge flags */
		const __m256i mbuf_flags = _mm256_or_si256(l3_l4_flags,
				_mm256_or_si256(rss_flags, vlan_flags));
		/*
		 * At this point, we have the 8 sets of flags in the low 16-bits
		 * of each 32-bit value in vlan0.
		 * We want to extract these, and merge them with the mbuf init data
		 * so we can do a single write to the mbuf to set the flags
		 * and all the other initialization fields. Extracting the
		 * appropriate flags means that we have to do a shift and blend for
		 * each mbuf before we do the write. However, we can also
		 * add in the previously computed rx_descriptor fields to
		 * make a single 256-bit write per mbuf
		 */
		/* check the structure matches expectations */
		RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, ol_flags) !=
				offsetof(struct rte_mbuf, rearm_data) + 8);
		RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, rearm_data) !=
				RTE_ALIGN(offsetof(struct rte_mbuf, rearm_data), 16));
		/* build up data and do writes */
		__m256i rearm0, rearm1, rearm2, rearm3, rearm4, rearm5,
				rearm6, rearm7;
		rearm6 = _mm256_blend_epi32(mbuf_init, _mm256_slli_si256(mbuf_flags, 8), 0x04);
		rearm4 = _mm256_blend_epi32(mbuf_init, _mm256_slli_si256(mbuf_flags, 4), 0x04);
		rearm2 = _mm256_blend_epi32(mbuf_init, mbuf_flags, 0x04);
		rearm0 = _mm256_blend_epi32(mbuf_init, _mm256_srli_si256(mbuf_flags, 4), 0x04);
		/* permute to add in the rx_descriptor e.g. rss fields */
		rearm6 = _mm256_permute2f128_si256(rearm6, mb6_7, 0x20);
		rearm4 = _mm256_permute2f128_si256(rearm4, mb4_5, 0x20);
		rearm2 = _mm256_permute2f128_si256(rearm2, mb2_3, 0x20);
		rearm0 = _mm256_permute2f128_si256(rearm0, mb0_1, 0x20);
		/* write to mbuf */
		_mm256_storeu_si256((__m256i *)&rx_pkts[i + 6]->rearm_data, rearm6);
		_mm256_storeu_si256((__m256i *)&rx_pkts[i + 4]->rearm_data, rearm4);
		_mm256_storeu_si256((__m256i *)&rx_pkts[i + 2]->rearm_data, rearm2);
		_mm256_storeu_si256((__m256i *)&rx_pkts[i + 0]->rearm_data, rearm0);

		/* repeat for the odd mbufs */
		const __m256i odd_flags = _mm256_castsi128_si256(
				_mm256_extracti128_si256(mbuf_flags, 1));
		rearm7 = _mm256_blend_epi32(mbuf_init, _mm256_slli_si256(odd_flags, 8), 0x04);
		rearm5 = _mm256_blend_epi32(mbuf_init, _mm256_slli_si256(odd_flags, 4), 0x04);
		rearm3 = _mm256_blend_epi32(mbuf_init, odd_flags, 0x04);
		rearm1 = _mm256_blend_epi32(mbuf_init, _mm256_srli_si256(odd_flags, 4), 0x04);
		/* since odd mbufs are already in hi 128-bits use blend */
		rearm7 = _mm256_blend_epi32(rearm7, mb6_7, 0xF0);
		rearm5 = _mm256_blend_epi32(rearm5, mb4_5, 0xF0);
		rearm3 = _mm256_blend_epi32(rearm3, mb2_3, 0xF0);
		rearm1 = _mm256_blend_epi32(rearm1, mb0_1, 0xF0);
		/* again write to mbufs */
		_mm256_storeu_si256((__m256i *)&rx_pkts[i + 7]->rearm_data, rearm7);
		_mm256_storeu_si256((__m256i *)&rx_pkts[i + 5]->rearm_data, rearm5);
		_mm256_storeu_si256((__m256i *)&rx_pkts[i + 3]->rearm_data, rearm3);
		_mm256_storeu_si256((__m256i *)&rx_pkts[i + 1]->rearm_data, rearm1);

		/* extract and record EOP bit */
		if (split_packet) {
			const __m128i eop_mask = _mm_set1_epi16(
					1 << I40E_RX_DESC_STATUS_EOF_SHIFT);
			const __m256i eop_bits256 = _mm256_and_si256(status0_7,
					eop_check);
			/* pack status bits into a single 128-bit register */
			const __m128i eop_bits = _mm_packus_epi32(
					_mm256_castsi256_si128(eop_bits256),
					_mm256_extractf128_si256(eop_bits256, 1));
			/*
			 * flip bits, and mask out the EOP bit, which is now
			 * a split-packet bit i.e. !EOP, rather than EOP one.
			 */
			__m128i split_bits = _mm_andnot_si128(eop_bits,
					eop_mask);
			/*
			 * eop bits are out of order, so we need to shuffle them
			 * back into order again. In doing so, only use low 8
			 * bits, which acts like another pack instruction
			 * The original order is (hi->lo): 1,3,5,7,0,2,4,6
			 * [Since we use epi8, the 16-bit positions are
			 * multiplied by 2 in the eop_shuffle value.]
			 */
			__m128i eop_shuffle = _mm_set_epi8(
					0xFF, 0xFF, 0xFF, 0xFF, /* zero hi 64b */
					0xFF, 0xFF, 0xFF, 0xFF,
					8, 0, 10, 2, /* move values to lo 64b */
					12, 4, 14, 6);
			split_bits = _mm_shuffle_epi8(split_bits, eop_shuffle);
			*(uint64_t *)split_packet = _mm_cvtsi128_si64(split_bits);
			split_packet += RTE_I40E_DESCS_PER_LOOP_AVX;
		}

		/* perform dd_check */
		status0_7 = _mm256_and_si256(status0_7, dd_check);
		status0_7 = _mm256_packs_epi32(status0_7,
				_mm256_setzero_si256());

		uint64_t burst = __builtin_popcountll(_mm_cvtsi128_si64(
				_mm256_extracti128_si256(status0_7, 1)));
		burst += __builtin_popcountll(_mm_cvtsi128_si64(
				_mm256_castsi256_si128(status0_7)));
		received += burst;
		if (burst != RTE_I40E_DESCS_PER_LOOP_AVX)
			break;
	}

	/* update tail pointers */
	rxq->rx_tail += received;
	rxq->rx_tail &= (rxq->nb_rx_desc - 1);
	if ((rxq->rx_tail & 1) == 1 && received > 1) { /* keep avx2 aligned */
		rxq->rx_tail--;
		received--;
	}
	rxq->rxrearm_nb += received;
	return received;
}

/*
 * Notice:
 * - nb_pkts < RTE_I40E_DESCS_PER_LOOP, just return no packet
 */
uint16_t
i40e_recv_pkts_vec_avx2(void *rx_queue, struct rte_mbuf **rx_pkts,
		   uint16_t nb_pkts)
{
	return _recv_raw_pkts_vec_avx2(rx_queue, rx_pkts, nb_pkts, NULL);
}

/*
 * vPMD receive routine that reassembles single burst of 32 scattered packets
 * Notice:
 * - nb_pkts < RTE_I40E_DESCS_PER_LOOP, just return no packet
 */
static uint16_t
i40e_recv_scattered_burst_vec_avx2(void *rx_queue, struct rte_mbuf **rx_pkts,
			     uint16_t nb_pkts)
{
	struct i40e_rx_queue *rxq = rx_queue;
	uint8_t split_flags[RTE_I40E_VPMD_RX_BURST] = {0};

	/* get some new buffers */
	uint16_t nb_bufs = _recv_raw_pkts_vec_avx2(rxq, rx_pkts, nb_pkts,
			split_flags);
	if (nb_bufs == 0)
		return 0;

	/* happy day case, full burst + no packets to be joined */
	const uint64_t *split_fl64 = (uint64_t *)split_flags;

	if (rxq->pkt_first_seg == NULL &&
			split_fl64[0] == 0 && split_fl64[1] == 0 &&
			split_fl64[2] == 0 && split_fl64[3] == 0)
		return nb_bufs;

	/* reassemble any packets that need reassembly*/
	unsigned int i = 0;

	if (rxq->pkt_first_seg == NULL) {
		/* find the first split flag, and only reassemble then*/
		while (i < nb_bufs && !split_flags[i])
			i++;
		if (i == nb_bufs)
			return nb_bufs;
	}
	return i + reassemble_packets(rxq, &rx_pkts[i], nb_bufs - i,
		&split_flags[i]);
}

/*
 * vPMD receive routine that reassembles scattered packets.
 * Main receive routine that can handle arbitrary burst sizes
 * Notice:
 * - nb_pkts < RTE_I40E_DESCS_PER_LOOP, just return no packet
 */
uint16_t
i40e_recv_scattered_pkts_vec_avx2(void *rx_queue, struct rte_mbuf **rx_pkts,
			     uint16_t nb_pkts)
{
	uint16_t retval = 0;
	while (nb_pkts > RTE_I40E_VPMD_RX_BURST) {
		uint16_t burst = i40e_recv_scattered_burst_vec_avx2(rx_queue,
				rx_pkts + retval, RTE_I40E_VPMD_RX_BURST);
		retval += burst;
		nb_pkts -= burst;
		if (burst < RTE_I40E_VPMD_RX_BURST)
			return retval;
	}
	return retval + i40e_recv_scattered_burst_vec_avx2(rx_queue,
				rx_pkts + retval, nb_pkts);
}


static inline void
vtx1(volatile struct i40e_tx_desc *txdp,
		struct rte_mbuf *pkt, uint64_t flags)
{
	uint64_t high_qw = (I40E_TX_DESC_DTYPE_DATA |
			((uint64_t)flags  << I40E_TXD_QW1_CMD_SHIFT) |
			((uint64_t)pkt->data_len << I40E_TXD_QW1_TX_BUF_SZ_SHIFT));

	__m128i descriptor = _mm_set_epi64x(high_qw,
				pkt->buf_physaddr + pkt->data_off);
	_mm_store_si128((__m128i *)txdp, descriptor);
}

static inline void
vtx(volatile struct i40e_tx_desc *txdp,
		struct rte_mbuf **pkt, uint16_t nb_pkts,  uint64_t flags)
{
	const uint64_t hi_qw_tmpl = (I40E_TX_DESC_DTYPE_DATA |
			((uint64_t)flags  << I40E_TXD_QW1_CMD_SHIFT));

	/* if unaligned on 32-bit boundary, do one to align */
	if (((uintptr_t)txdp & 0x1F) != 0 && nb_pkts != 0) {
		vtx1(txdp, *pkt, flags);
		nb_pkts--, txdp++, pkt++;
	}

	/* do two at a time while possible, in bursts */
	for (; nb_pkts > 3; txdp += 4, pkt += 4, nb_pkts -= 4) {
		uint64_t hi_qw3 = hi_qw_tmpl |
				((uint64_t)pkt[3]->data_len << I40E_TXD_QW1_TX_BUF_SZ_SHIFT);
		uint64_t hi_qw2 = hi_qw_tmpl |
				((uint64_t)pkt[2]->data_len << I40E_TXD_QW1_TX_BUF_SZ_SHIFT);
		uint64_t hi_qw1 = hi_qw_tmpl |
				((uint64_t)pkt[1]->data_len << I40E_TXD_QW1_TX_BUF_SZ_SHIFT);
		uint64_t hi_qw0 = hi_qw_tmpl |
				((uint64_t)pkt[0]->data_len << I40E_TXD_QW1_TX_BUF_SZ_SHIFT);

		__m256i desc2_3 = _mm256_set_epi64x(
				hi_qw3, pkt[3]->buf_physaddr + pkt[3]->data_off,
				hi_qw2, pkt[2]->buf_physaddr + pkt[2]->data_off);
		__m256i desc0_1 = _mm256_set_epi64x(
				hi_qw1, pkt[1]->buf_physaddr + pkt[1]->data_off,
				hi_qw0, pkt[0]->buf_physaddr + pkt[0]->data_off);
		_mm256_store_si256((void *)(txdp + 2), desc2_3);
		_mm256_store_si256((void *)txdp, desc0_1);
	}

	/* do any last ones */
	while (nb_pkts) {
		vtx1(txdp, *pkt, flags);
		txdp++, pkt++, nb_pkts--;
	}
}

static inline uint16_t
i40e_xmit_fixed_burst_vec_avx2(void *tx_queue, struct rte_mbuf **tx_pkts,
			  uint16_t nb_pkts)
{
	struct i40e_tx_queue *txq = (struct i40e_tx_queue *)tx_queue;
	volatile struct i40e_tx_desc *txdp;
	struct i40e_tx_entry *txep;
	uint16_t n, nb_commit, tx_id;
	uint64_t flags = I40E_TD_CMD;
	uint64_t rs = I40E_TX_DESC_CMD_RS | I40E_TD_CMD;

	/* cross rx_thresh boundary is not allowed */
	nb_pkts = RTE_MIN(nb_pkts, txq->tx_rs_thresh);

	if (txq->nb_tx_free < txq->tx_free_thresh)
		i40e_tx_free_bufs(txq);

	nb_commit = nb_pkts = (uint16_t)RTE_MIN(txq->nb_tx_free, nb_pkts);
	if (unlikely(nb_pkts == 0))
		return 0;

	tx_id = txq->tx_tail;
	txdp = &txq->tx_ring[tx_id];
	txep = &txq->sw_ring[tx_id];

	txq->nb_tx_free = (uint16_t)(txq->nb_tx_free - nb_pkts);

	n = (uint16_t)(txq->nb_tx_desc - tx_id);
	if (nb_commit >= n) {
		tx_backlog_entry(txep, tx_pkts, n);

		vtx(txdp, tx_pkts, n - 1, flags);
		tx_pkts += (n - 1);
		txdp += (n - 1);

		vtx1(txdp, *tx_pkts++, rs);

		nb_commit = (uint16_t)(nb_commit - n);

		tx_id = 0;
		txq->tx_next_rs = (uint16_t)(txq->tx_rs_thresh - 1);

		/* avoid reach the end of ring */
		txdp = &txq->tx_ring[tx_id];
		txep = &txq->sw_ring[tx_id];
	}

	tx_backlog_entry(txep, tx_pkts, nb_commit);

	vtx(txdp, tx_pkts, nb_commit, flags);

	tx_id = (uint16_t)(tx_id + nb_commit);
	if (tx_id > txq->tx_next_rs) {
		txq->tx_ring[txq->tx_next_rs].cmd_type_offset_bsz |=
			rte_cpu_to_le_64(((uint64_t)I40E_TX_DESC_CMD_RS) <<
						I40E_TXD_QW1_CMD_SHIFT);
		txq->tx_next_rs =
			(uint16_t)(txq->tx_next_rs + txq->tx_rs_thresh);
	}

	txq->tx_tail = tx_id;

	I40E_PCI_REG_WRITE(txq->qtx_tail, txq->tx_tail);

	return nb_pkts;
}

uint16_t
i40e_xmit_pkts_vec_avx2(void *tx_queue, struct rte_mbuf **tx_pkts,
		   uint16_t nb_pkts)
{
	uint16_t nb_tx = 0;
	struct i40e_tx_queue *txq = (struct i40e_tx_queue *)tx_queue;

	while (nb_pkts) {
		uint16_t ret, num;

		num = (uint16_t)RTE_MIN(nb_pkts, txq->tx_rs_thresh);
		ret = i40e_xmit_fixed_burst_vec_avx2(tx_queue, &tx_pkts[nb_tx],
						num);
		nb_tx += ret;
		nb_pkts -= ret;
		if (ret < num)
			break;
	}

	return nb_tx;
}