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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2015 Intel Corporation
*/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <tmmintrin.h>
#include <rte_byteorder.h>
#include <rte_branch_prediction.h>
#include <rte_cycles.h>
#include <rte_ether.h>
#include <rte_ethdev_driver.h>
#include <rte_errno.h>
#include <rte_memory.h>
#include <rte_mempool.h>
#include <rte_malloc.h>
#include <rte_mbuf.h>
#include <rte_prefetch.h>
#include <rte_string_fns.h>
#include "virtio_rxtx_simple.h"
#define RTE_VIRTIO_DESC_PER_LOOP 8
/* virtio vPMD receive routine, only accept(nb_pkts >= RTE_VIRTIO_DESC_PER_LOOP)
*
* This routine is for non-mergeable RX, one desc for each guest buffer.
* This routine is based on the RX ring layout optimization. Each entry in the
* avail ring points to the desc with the same index in the desc ring and this
* will never be changed in the driver.
*
* - nb_pkts < RTE_VIRTIO_DESC_PER_LOOP, just return no packet
*/
uint16_t
virtio_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
uint16_t nb_pkts)
{
struct virtnet_rx *rxvq = rx_queue;
struct virtqueue *vq = rxvq->vq;
struct virtio_hw *hw = vq->hw;
uint16_t nb_used;
uint16_t desc_idx;
struct vring_used_elem *rused;
struct rte_mbuf **sw_ring;
struct rte_mbuf **sw_ring_end;
uint16_t nb_pkts_received = 0;
__m128i shuf_msk1, shuf_msk2, len_adjust;
shuf_msk1 = _mm_set_epi8(
0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, /* vlan tci */
5, 4, /* dat len */
0xFF, 0xFF, 5, 4, /* pkt len */
0xFF, 0xFF, 0xFF, 0xFF /* packet type */
);
shuf_msk2 = _mm_set_epi8(
0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, /* vlan tci */
13, 12, /* dat len */
0xFF, 0xFF, 13, 12, /* pkt len */
0xFF, 0xFF, 0xFF, 0xFF /* packet type */
);
/* Subtract the header length.
* In which case do we need the header length in used->len ?
*/
len_adjust = _mm_set_epi16(
0, 0,
0,
(uint16_t)-vq->hw->vtnet_hdr_size,
0, (uint16_t)-vq->hw->vtnet_hdr_size,
0, 0);
if (unlikely(hw->started == 0))
return nb_pkts_received;
if (unlikely(nb_pkts < RTE_VIRTIO_DESC_PER_LOOP))
return 0;
nb_used = VIRTQUEUE_NUSED(vq);
rte_compiler_barrier();
if (unlikely(nb_used == 0))
return 0;
nb_pkts = RTE_ALIGN_FLOOR(nb_pkts, RTE_VIRTIO_DESC_PER_LOOP);
nb_used = RTE_MIN(nb_used, nb_pkts);
desc_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
rused = &vq->vq_ring.used->ring[desc_idx];
sw_ring = &vq->sw_ring[desc_idx];
sw_ring_end = &vq->sw_ring[vq->vq_nentries];
rte_prefetch0(rused);
if (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) {
virtio_rxq_rearm_vec(rxvq);
if (unlikely(virtqueue_kick_prepare(vq)))
virtqueue_notify(vq);
}
for (nb_pkts_received = 0;
nb_pkts_received < nb_used;) {
__m128i desc[RTE_VIRTIO_DESC_PER_LOOP / 2];
__m128i mbp[RTE_VIRTIO_DESC_PER_LOOP / 2];
__m128i pkt_mb[RTE_VIRTIO_DESC_PER_LOOP];
mbp[0] = _mm_loadu_si128((__m128i *)(sw_ring + 0));
desc[0] = _mm_loadu_si128((__m128i *)(rused + 0));
_mm_storeu_si128((__m128i *)&rx_pkts[0], mbp[0]);
mbp[1] = _mm_loadu_si128((__m128i *)(sw_ring + 2));
desc[1] = _mm_loadu_si128((__m128i *)(rused + 2));
_mm_storeu_si128((__m128i *)&rx_pkts[2], mbp[1]);
mbp[2] = _mm_loadu_si128((__m128i *)(sw_ring + 4));
desc[2] = _mm_loadu_si128((__m128i *)(rused + 4));
_mm_storeu_si128((__m128i *)&rx_pkts[4], mbp[2]);
mbp[3] = _mm_loadu_si128((__m128i *)(sw_ring + 6));
desc[3] = _mm_loadu_si128((__m128i *)(rused + 6));
_mm_storeu_si128((__m128i *)&rx_pkts[6], mbp[3]);
pkt_mb[1] = _mm_shuffle_epi8(desc[0], shuf_msk2);
pkt_mb[0] = _mm_shuffle_epi8(desc[0], shuf_msk1);
pkt_mb[1] = _mm_add_epi16(pkt_mb[1], len_adjust);
pkt_mb[0] = _mm_add_epi16(pkt_mb[0], len_adjust);
_mm_storeu_si128((void *)&rx_pkts[1]->rx_descriptor_fields1,
pkt_mb[1]);
_mm_storeu_si128((void *)&rx_pkts[0]->rx_descriptor_fields1,
pkt_mb[0]);
pkt_mb[3] = _mm_shuffle_epi8(desc[1], shuf_msk2);
pkt_mb[2] = _mm_shuffle_epi8(desc[1], shuf_msk1);
pkt_mb[3] = _mm_add_epi16(pkt_mb[3], len_adjust);
pkt_mb[2] = _mm_add_epi16(pkt_mb[2], len_adjust);
_mm_storeu_si128((void *)&rx_pkts[3]->rx_descriptor_fields1,
pkt_mb[3]);
_mm_storeu_si128((void *)&rx_pkts[2]->rx_descriptor_fields1,
pkt_mb[2]);
pkt_mb[5] = _mm_shuffle_epi8(desc[2], shuf_msk2);
pkt_mb[4] = _mm_shuffle_epi8(desc[2], shuf_msk1);
pkt_mb[5] = _mm_add_epi16(pkt_mb[5], len_adjust);
pkt_mb[4] = _mm_add_epi16(pkt_mb[4], len_adjust);
_mm_storeu_si128((void *)&rx_pkts[5]->rx_descriptor_fields1,
pkt_mb[5]);
_mm_storeu_si128((void *)&rx_pkts[4]->rx_descriptor_fields1,
pkt_mb[4]);
pkt_mb[7] = _mm_shuffle_epi8(desc[3], shuf_msk2);
pkt_mb[6] = _mm_shuffle_epi8(desc[3], shuf_msk1);
pkt_mb[7] = _mm_add_epi16(pkt_mb[7], len_adjust);
pkt_mb[6] = _mm_add_epi16(pkt_mb[6], len_adjust);
_mm_storeu_si128((void *)&rx_pkts[7]->rx_descriptor_fields1,
pkt_mb[7]);
_mm_storeu_si128((void *)&rx_pkts[6]->rx_descriptor_fields1,
pkt_mb[6]);
if (unlikely(nb_used <= RTE_VIRTIO_DESC_PER_LOOP)) {
if (sw_ring + nb_used <= sw_ring_end)
nb_pkts_received += nb_used;
else
nb_pkts_received += sw_ring_end - sw_ring;
break;
} else {
if (unlikely(sw_ring + RTE_VIRTIO_DESC_PER_LOOP >=
sw_ring_end)) {
nb_pkts_received += sw_ring_end - sw_ring;
break;
} else {
nb_pkts_received += RTE_VIRTIO_DESC_PER_LOOP;
rx_pkts += RTE_VIRTIO_DESC_PER_LOOP;
sw_ring += RTE_VIRTIO_DESC_PER_LOOP;
rused += RTE_VIRTIO_DESC_PER_LOOP;
nb_used -= RTE_VIRTIO_DESC_PER_LOOP;
}
}
}
vq->vq_used_cons_idx += nb_pkts_received;
vq->vq_free_cnt += nb_pkts_received;
rxvq->stats.packets += nb_pkts_received;
return nb_pkts_received;
}
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