9e190e97c9
Virtio_hw *hw has been pointed to vq->hw, it is better to use hw instead of vq->hw in later code. Signed-off-by: Joyce Kong <joyce.kong@arm.com> Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com> Reviewed-by: Chenbo Xia <chenbo.xia@intel.com> Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
214 lines
6.5 KiB
C
214 lines
6.5 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright(c) 2016 Cavium, Inc
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <rte_byteorder.h>
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#include <rte_branch_prediction.h>
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#include <rte_cycles.h>
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#include <rte_ether.h>
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#include <rte_ethdev_driver.h>
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#include <rte_errno.h>
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#include <rte_memory.h>
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#include <rte_mempool.h>
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#include <rte_malloc.h>
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#include <rte_mbuf.h>
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#include <rte_prefetch.h>
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#include <rte_string_fns.h>
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#include <rte_vect.h>
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#include "virtio_rxtx_simple.h"
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#define RTE_VIRTIO_DESC_PER_LOOP 8
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/* virtio vPMD receive routine, only accept(nb_pkts >= RTE_VIRTIO_DESC_PER_LOOP)
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*
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* This routine is for non-mergeable RX, one desc for each guest buffer.
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* This routine is based on the RX ring layout optimization. Each entry in the
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* avail ring points to the desc with the same index in the desc ring and this
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* will never be changed in the driver.
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*
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* - nb_pkts < RTE_VIRTIO_DESC_PER_LOOP, just return no packet
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*/
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uint16_t
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virtio_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
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uint16_t nb_pkts)
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{
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struct virtnet_rx *rxvq = rx_queue;
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struct virtqueue *vq = rxvq->vq;
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struct virtio_hw *hw = vq->hw;
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uint16_t nb_used, nb_total;
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uint16_t desc_idx;
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struct vring_used_elem *rused;
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struct rte_mbuf **sw_ring;
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struct rte_mbuf **sw_ring_end;
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struct rte_mbuf **ref_rx_pkts;
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uint16_t nb_pkts_received = 0;
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uint8x16_t shuf_msk1 = {
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0xFF, 0xFF, 0xFF, 0xFF, /* packet type */
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4, 5, 0xFF, 0xFF, /* pkt len */
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4, 5, /* dat len */
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0xFF, 0xFF, /* vlan tci */
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0xFF, 0xFF, 0xFF, 0xFF
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};
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uint8x16_t shuf_msk2 = {
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0xFF, 0xFF, 0xFF, 0xFF, /* packet type */
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12, 13, 0xFF, 0xFF, /* pkt len */
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12, 13, /* dat len */
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0xFF, 0xFF, /* vlan tci */
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0xFF, 0xFF, 0xFF, 0xFF
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};
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/* Subtract the header length.
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* In which case do we need the header length in used->len ?
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*/
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uint16x8_t len_adjust = {
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0, 0,
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(uint16_t)hw->vtnet_hdr_size, 0,
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(uint16_t)hw->vtnet_hdr_size,
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0,
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0, 0
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};
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if (unlikely(hw->started == 0))
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return nb_pkts_received;
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if (unlikely(nb_pkts < RTE_VIRTIO_DESC_PER_LOOP))
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return 0;
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/* virtqueue_nused has a load-acquire or rte_cio_rmb inside */
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nb_used = virtqueue_nused(vq);
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if (unlikely(nb_used == 0))
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return 0;
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nb_pkts = RTE_ALIGN_FLOOR(nb_pkts, RTE_VIRTIO_DESC_PER_LOOP);
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nb_used = RTE_MIN(nb_used, nb_pkts);
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desc_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
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rused = &vq->vq_split.ring.used->ring[desc_idx];
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sw_ring = &vq->sw_ring[desc_idx];
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sw_ring_end = &vq->sw_ring[vq->vq_nentries];
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rte_prefetch_non_temporal(rused);
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if (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) {
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virtio_rxq_rearm_vec(rxvq);
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if (unlikely(virtqueue_kick_prepare(vq)))
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virtqueue_notify(vq);
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}
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nb_total = nb_used;
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ref_rx_pkts = rx_pkts;
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for (nb_pkts_received = 0;
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nb_pkts_received < nb_total;) {
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uint64x2_t desc[RTE_VIRTIO_DESC_PER_LOOP / 2];
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uint64x2_t mbp[RTE_VIRTIO_DESC_PER_LOOP / 2];
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uint64x2_t pkt_mb[RTE_VIRTIO_DESC_PER_LOOP];
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mbp[0] = vld1q_u64((uint64_t *)(sw_ring + 0));
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desc[0] = vld1q_u64((uint64_t *)(rused + 0));
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vst1q_u64((uint64_t *)&rx_pkts[0], mbp[0]);
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mbp[1] = vld1q_u64((uint64_t *)(sw_ring + 2));
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desc[1] = vld1q_u64((uint64_t *)(rused + 2));
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vst1q_u64((uint64_t *)&rx_pkts[2], mbp[1]);
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mbp[2] = vld1q_u64((uint64_t *)(sw_ring + 4));
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desc[2] = vld1q_u64((uint64_t *)(rused + 4));
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vst1q_u64((uint64_t *)&rx_pkts[4], mbp[2]);
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mbp[3] = vld1q_u64((uint64_t *)(sw_ring + 6));
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desc[3] = vld1q_u64((uint64_t *)(rused + 6));
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vst1q_u64((uint64_t *)&rx_pkts[6], mbp[3]);
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pkt_mb[1] = vreinterpretq_u64_u8(vqtbl1q_u8(
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vreinterpretq_u8_u64(desc[0]), shuf_msk2));
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pkt_mb[0] = vreinterpretq_u64_u8(vqtbl1q_u8(
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vreinterpretq_u8_u64(desc[0]), shuf_msk1));
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pkt_mb[1] = vreinterpretq_u64_u16(vsubq_u16(
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vreinterpretq_u16_u64(pkt_mb[1]), len_adjust));
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pkt_mb[0] = vreinterpretq_u64_u16(vsubq_u16(
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vreinterpretq_u16_u64(pkt_mb[0]), len_adjust));
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vst1q_u64((void *)&rx_pkts[1]->rx_descriptor_fields1,
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pkt_mb[1]);
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vst1q_u64((void *)&rx_pkts[0]->rx_descriptor_fields1,
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pkt_mb[0]);
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pkt_mb[3] = vreinterpretq_u64_u8(vqtbl1q_u8(
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vreinterpretq_u8_u64(desc[1]), shuf_msk2));
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pkt_mb[2] = vreinterpretq_u64_u8(vqtbl1q_u8(
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vreinterpretq_u8_u64(desc[1]), shuf_msk1));
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pkt_mb[3] = vreinterpretq_u64_u16(vsubq_u16(
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vreinterpretq_u16_u64(pkt_mb[3]), len_adjust));
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pkt_mb[2] = vreinterpretq_u64_u16(vsubq_u16(
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vreinterpretq_u16_u64(pkt_mb[2]), len_adjust));
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vst1q_u64((void *)&rx_pkts[3]->rx_descriptor_fields1,
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pkt_mb[3]);
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vst1q_u64((void *)&rx_pkts[2]->rx_descriptor_fields1,
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pkt_mb[2]);
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pkt_mb[5] = vreinterpretq_u64_u8(vqtbl1q_u8(
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vreinterpretq_u8_u64(desc[2]), shuf_msk2));
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pkt_mb[4] = vreinterpretq_u64_u8(vqtbl1q_u8(
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vreinterpretq_u8_u64(desc[2]), shuf_msk1));
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pkt_mb[5] = vreinterpretq_u64_u16(vsubq_u16(
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vreinterpretq_u16_u64(pkt_mb[5]), len_adjust));
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pkt_mb[4] = vreinterpretq_u64_u16(vsubq_u16(
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vreinterpretq_u16_u64(pkt_mb[4]), len_adjust));
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vst1q_u64((void *)&rx_pkts[5]->rx_descriptor_fields1,
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pkt_mb[5]);
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vst1q_u64((void *)&rx_pkts[4]->rx_descriptor_fields1,
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pkt_mb[4]);
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pkt_mb[7] = vreinterpretq_u64_u8(vqtbl1q_u8(
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vreinterpretq_u8_u64(desc[3]), shuf_msk2));
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pkt_mb[6] = vreinterpretq_u64_u8(vqtbl1q_u8(
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vreinterpretq_u8_u64(desc[3]), shuf_msk1));
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pkt_mb[7] = vreinterpretq_u64_u16(vsubq_u16(
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vreinterpretq_u16_u64(pkt_mb[7]), len_adjust));
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pkt_mb[6] = vreinterpretq_u64_u16(vsubq_u16(
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vreinterpretq_u16_u64(pkt_mb[6]), len_adjust));
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vst1q_u64((void *)&rx_pkts[7]->rx_descriptor_fields1,
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pkt_mb[7]);
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vst1q_u64((void *)&rx_pkts[6]->rx_descriptor_fields1,
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pkt_mb[6]);
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if (unlikely(nb_used <= RTE_VIRTIO_DESC_PER_LOOP)) {
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if (sw_ring + nb_used <= sw_ring_end)
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nb_pkts_received += nb_used;
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else
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nb_pkts_received += sw_ring_end - sw_ring;
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break;
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} else {
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if (unlikely(sw_ring + RTE_VIRTIO_DESC_PER_LOOP >=
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sw_ring_end)) {
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nb_pkts_received += sw_ring_end - sw_ring;
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break;
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} else {
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nb_pkts_received += RTE_VIRTIO_DESC_PER_LOOP;
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rx_pkts += RTE_VIRTIO_DESC_PER_LOOP;
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sw_ring += RTE_VIRTIO_DESC_PER_LOOP;
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rused += RTE_VIRTIO_DESC_PER_LOOP;
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nb_used -= RTE_VIRTIO_DESC_PER_LOOP;
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}
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}
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}
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vq->vq_used_cons_idx += nb_pkts_received;
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vq->vq_free_cnt += nb_pkts_received;
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rxvq->stats.packets += nb_pkts_received;
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for (nb_used = 0; nb_used < nb_pkts_received; nb_used++)
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virtio_update_packet_stats(&rxvq->stats, ref_rx_pkts[nb_used]);
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return nb_pkts_received;
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}
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