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numam-dpdk/drivers/net/iavf/iavf_rxtx_vec_avx2.c
Leyi Rong af0c246a38 net/iavf: enable AVX2 for iavf 
This patch enables AVX data path for iavf PMD.

Signed-off-by: Leyi Rong <leyi.rong@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>
2019-10-23 16:43:10 +02:00

868 lines
28 KiB
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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2019 Intel Corporation
*/
#include "base/iavf_prototype.h"
#include "iavf_rxtx_vec_common.h"
#include <x86intrin.h>
#ifndef __INTEL_COMPILER
#pragma GCC diagnostic ignored "-Wcast-qual"
#endif
static inline void
iavf_rxq_rearm(struct iavf_rx_queue *rxq)
{
int i;
uint16_t rx_id;
volatile union iavf_rx_desc *rxdp;
struct rte_mbuf **rxp = &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 *)rxp,
IAVF_RXQ_REARM_THRESH) < 0) {
if (rxq->rxrearm_nb + IAVF_RXQ_REARM_THRESH >=
rxq->nb_rx_desc) {
__m128i dma_addr0;
dma_addr0 = _mm_setzero_si128();
for (i = 0; i < IAVF_VPMD_DESCS_PER_LOOP; i++) {
rxp[i] = &rxq->fake_mbuf;
_mm_store_si128((__m128i *)&rxdp[i].read,
dma_addr0);
}
}
rte_eth_devices[rxq->port_id].data->rx_mbuf_alloc_failed +=
IAVF_RXQ_REARM_THRESH;
return;
}
#ifndef RTE_LIBRTE_IAVF_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 < IAVF_RXQ_REARM_THRESH; i += 2, rxp += 2) {
__m128i vaddr0, vaddr1;
mb0 = rxp[0];
mb1 = rxp[1];
/* 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 < IAVF_RXQ_REARM_THRESH;
i += 4, rxp += 4, rxdp += 4) {
__m128i vaddr0, vaddr1, vaddr2, vaddr3;
__m256i vaddr0_1, vaddr2_3;
mb0 = rxp[0];
mb1 = rxp[1];
mb2 = rxp[2];
mb3 = rxp[3];
/* 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 += IAVF_RXQ_REARM_THRESH;
if (rxq->rxrearm_start >= rxq->nb_rx_desc)
rxq->rxrearm_start = 0;
rxq->rxrearm_nb -= IAVF_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 */
IAVF_PCI_REG_WRITE(rxq->qrx_tail, rx_id);
}
#define PKTLEN_SHIFT 10
static inline uint16_t
_iavf_recv_raw_pkts_vec_avx2(struct iavf_rx_queue *rxq,
struct rte_mbuf **rx_pkts,
uint16_t nb_pkts, uint8_t *split_packet)
{
#define IAVF_DESCS_PER_LOOP_AVX 8
/* const uint32_t *ptype_tbl = rxq->vsi->adapter->ptype_tbl; */
static const uint32_t type_table[UINT8_MAX + 1] __rte_cache_aligned = {
/* [0] reserved */
[1] = RTE_PTYPE_L2_ETHER,
/* [2] - [21] reserved */
[22] = RTE_PTYPE_L2_ETHER | RTE_PTYPE_L3_IPV4_EXT_UNKNOWN |
RTE_PTYPE_L4_FRAG,
[23] = RTE_PTYPE_L2_ETHER | RTE_PTYPE_L3_IPV4_EXT_UNKNOWN |
RTE_PTYPE_L4_NONFRAG,
[24] = RTE_PTYPE_L2_ETHER | RTE_PTYPE_L3_IPV4_EXT_UNKNOWN |
RTE_PTYPE_L4_UDP,
/* [25] reserved */
[26] = RTE_PTYPE_L2_ETHER | RTE_PTYPE_L3_IPV4_EXT_UNKNOWN |
RTE_PTYPE_L4_TCP,
[27] = RTE_PTYPE_L2_ETHER | RTE_PTYPE_L3_IPV4_EXT_UNKNOWN |
RTE_PTYPE_L4_SCTP,
[28] = RTE_PTYPE_L2_ETHER | RTE_PTYPE_L3_IPV4_EXT_UNKNOWN |
RTE_PTYPE_L4_ICMP,
/* All others reserved */
};
const __m256i mbuf_init = _mm256_set_epi64x(0, 0,
0, rxq->mbuf_initializer);
/* struct iavf_rx_entry *sw_ring = &rxq->sw_ring[rxq->rx_tail]; */
struct rte_mbuf **sw_ring = &rxq->sw_ring[rxq->rx_tail];
volatile union iavf_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 IAVF_DESCS_PER_LOOP_AVX */
nb_pkts = RTE_ALIGN_FLOOR(nb_pkts, IAVF_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 > IAVF_RXQ_REARM_THRESH)
iavf_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 << IAVF_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,
IAVF_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 += IAVF_DESCS_PER_LOOP_AVX,
rxdp += IAVF_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_IAVF_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
{
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);
}
if (split_packet) {
int j;
for (j = 0; j < IAVF_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, type_table[ptype7], 4);
mb6_7 = _mm256_insert_epi32(mb6_7, type_table[ptype6], 0);
mb4_5 = _mm256_insert_epi32(mb4_5, type_table[ptype5], 4);
mb4_5 = _mm256_insert_epi32(mb4_5, type_table[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, type_table[ptype3], 4);
mb2_3 = _mm256_insert_epi32(mb2_3, type_table[ptype2], 0);
mb0_1 = _mm256_insert_epi32(mb0_1, type_table[ptype1], 4);
mb0_1 = _mm256_insert_epi32(mb0_1, type_table[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 << IAVF_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(/* zero hi 64b */
0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF,
/* move values to lo 64b */
8, 0, 10, 2,
12, 4, 14, 6);
split_bits = _mm_shuffle_epi8(split_bits, eop_shuffle);
*(uint64_t *)split_packet =
_mm_cvtsi128_si64(split_bits);
split_packet += IAVF_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 != IAVF_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 < IAVF_DESCS_PER_LOOP, just return no packet
*/
uint16_t
iavf_recv_pkts_vec_avx2(void *rx_queue, struct rte_mbuf **rx_pkts,
uint16_t nb_pkts)
{
return _iavf_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 < IAVF_DESCS_PER_LOOP, just return no packet
*/
static uint16_t
iavf_recv_scattered_burst_vec_avx2(void *rx_queue, struct rte_mbuf **rx_pkts,
uint16_t nb_pkts)
{
struct iavf_rx_queue *rxq = rx_queue;
uint8_t split_flags[IAVF_VPMD_RX_MAX_BURST] = {0};
/* get some new buffers */
uint16_t nb_bufs = _iavf_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 &&
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) {
/* find the first split flag, and only reassemble then*/
while (i < nb_bufs && !split_flags[i])
i++;
if (i == nb_bufs)
return nb_bufs;
rxq->pkt_first_seg = rx_pkts[i];
}
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 < IAVF_DESCS_PER_LOOP, just return no packet
*/
uint16_t
iavf_recv_scattered_pkts_vec_avx2(void *rx_queue, struct rte_mbuf **rx_pkts,
uint16_t nb_pkts)
{
uint16_t retval = 0;
while (nb_pkts > IAVF_VPMD_RX_MAX_BURST) {
uint16_t burst = iavf_recv_scattered_burst_vec_avx2(rx_queue,
rx_pkts + retval, IAVF_VPMD_RX_MAX_BURST);
retval += burst;
nb_pkts -= burst;
if (burst < IAVF_VPMD_RX_MAX_BURST)
return retval;
}
return retval + iavf_recv_scattered_burst_vec_avx2(rx_queue,
rx_pkts + retval, nb_pkts);
}
static inline void
iavf_vtx1(volatile struct iavf_tx_desc *txdp,
struct rte_mbuf *pkt, uint64_t flags)
{
uint64_t high_qw =
(IAVF_TX_DESC_DTYPE_DATA |
((uint64_t)flags << IAVF_TXD_QW1_CMD_SHIFT) |
((uint64_t)pkt->data_len << IAVF_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
iavf_vtx(volatile struct iavf_tx_desc *txdp,
struct rte_mbuf **pkt, uint16_t nb_pkts, uint64_t flags)
{
const uint64_t hi_qw_tmpl = (IAVF_TX_DESC_DTYPE_DATA |
((uint64_t)flags << IAVF_TXD_QW1_CMD_SHIFT));
/* if unaligned on 32-bit boundary, do one to align */
if (((uintptr_t)txdp & 0x1F) != 0 && nb_pkts != 0) {
iavf_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 <<
IAVF_TXD_QW1_TX_BUF_SZ_SHIFT);
uint64_t hi_qw2 =
hi_qw_tmpl |
((uint64_t)pkt[2]->data_len <<
IAVF_TXD_QW1_TX_BUF_SZ_SHIFT);
uint64_t hi_qw1 =
hi_qw_tmpl |
((uint64_t)pkt[1]->data_len <<
IAVF_TXD_QW1_TX_BUF_SZ_SHIFT);
uint64_t hi_qw0 =
hi_qw_tmpl |
((uint64_t)pkt[0]->data_len <<
IAVF_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) {
iavf_vtx1(txdp, *pkt, flags);
txdp++, pkt++, nb_pkts--;
}
}
static inline uint16_t
iavf_xmit_fixed_burst_vec_avx2(void *tx_queue, struct rte_mbuf **tx_pkts,
uint16_t nb_pkts)
{
struct iavf_tx_queue *txq = (struct iavf_tx_queue *)tx_queue;
volatile struct iavf_tx_desc *txdp;
struct iavf_tx_entry *txep;
uint16_t n, nb_commit, tx_id;
uint64_t flags = IAVF_TX_DESC_CMD_EOP;
uint64_t rs = IAVF_TX_DESC_CMD_RS | IAVF_TX_DESC_CMD_EOP;
/* cross rx_thresh boundary is not allowed */
nb_pkts = RTE_MIN(nb_pkts, txq->rs_thresh);
if (txq->nb_free < txq->free_thresh)
iavf_tx_free_bufs(txq);
nb_commit = nb_pkts = (uint16_t)RTE_MIN(txq->nb_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_free = (uint16_t)(txq->nb_free - nb_pkts);
n = (uint16_t)(txq->nb_tx_desc - tx_id);
if (nb_commit >= n) {
tx_backlog_entry(txep, tx_pkts, n);
iavf_vtx(txdp, tx_pkts, n - 1, flags);
tx_pkts += (n - 1);
txdp += (n - 1);
iavf_vtx1(txdp, *tx_pkts++, rs);
nb_commit = (uint16_t)(nb_commit - n);
tx_id = 0;
txq->next_rs = (uint16_t)(txq->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);
iavf_vtx(txdp, tx_pkts, nb_commit, flags);
tx_id = (uint16_t)(tx_id + nb_commit);
if (tx_id > txq->next_rs) {
txq->tx_ring[txq->next_rs].cmd_type_offset_bsz |=
rte_cpu_to_le_64(((uint64_t)IAVF_TX_DESC_CMD_RS) <<
IAVF_TXD_QW1_CMD_SHIFT);
txq->next_rs =
(uint16_t)(txq->next_rs + txq->rs_thresh);
}
txq->tx_tail = tx_id;
IAVF_PCI_REG_WRITE(txq->qtx_tail, txq->tx_tail);
return nb_pkts;
}
uint16_t
iavf_xmit_pkts_vec_avx2(void *tx_queue, struct rte_mbuf **tx_pkts,
uint16_t nb_pkts)
{
uint16_t nb_tx = 0;
struct iavf_tx_queue *txq = (struct iavf_tx_queue *)tx_queue;
while (nb_pkts) {
uint16_t ret, num;
num = (uint16_t)RTE_MIN(nb_pkts, txq->rs_thresh);
ret = iavf_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;
}
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