LCOV - code coverage report
Current view: top level - drivers/net/virtio - virtio_rxtx_simple_sse.c (source / functions) Hit Total Coverage
Test: Code coverage Lines: 0 41 0.0 %
Date: 2024-01-22 16:13:49 Functions: 0 1 0.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 0 22 0.0 %

           Branch data     Line data    Source code
       1                 :            : /* SPDX-License-Identifier: BSD-3-Clause
       2                 :            :  * Copyright(c) 2010-2015 Intel Corporation
       3                 :            :  */
       4                 :            : 
       5                 :            : #include <stdint.h>
       6                 :            : #include <stdio.h>
       7                 :            : #include <stdlib.h>
       8                 :            : #include <string.h>
       9                 :            : #include <errno.h>
      10                 :            : 
      11                 :            : #include <tmmintrin.h>
      12                 :            : 
      13                 :            : #include <rte_byteorder.h>
      14                 :            : #include <rte_branch_prediction.h>
      15                 :            : #include <rte_cycles.h>
      16                 :            : #include <rte_ether.h>
      17                 :            : #include <ethdev_driver.h>
      18                 :            : #include <rte_errno.h>
      19                 :            : #include <rte_memory.h>
      20                 :            : #include <rte_mempool.h>
      21                 :            : #include <rte_malloc.h>
      22                 :            : #include <rte_mbuf.h>
      23                 :            : #include <rte_prefetch.h>
      24                 :            : #include <rte_string_fns.h>
      25                 :            : 
      26                 :            : #include "virtio_rxtx_simple.h"
      27                 :            : 
      28                 :            : #define RTE_VIRTIO_DESC_PER_LOOP 8
      29                 :            : 
      30                 :            : /* virtio vPMD receive routine, only accept(nb_pkts >= RTE_VIRTIO_DESC_PER_LOOP)
      31                 :            :  *
      32                 :            :  * This routine is for non-mergeable RX, one desc for each guest buffer.
      33                 :            :  * This routine is based on the RX ring layout optimization. Each entry in the
      34                 :            :  * avail ring points to the desc with the same index in the desc ring and this
      35                 :            :  * will never be changed in the driver.
      36                 :            :  *
      37                 :            :  * - nb_pkts < RTE_VIRTIO_DESC_PER_LOOP, just return no packet
      38                 :            :  */
      39                 :            : uint16_t
      40                 :          0 : virtio_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
      41                 :            :         uint16_t nb_pkts)
      42                 :            : {
      43                 :            :         struct virtnet_rx *rxvq = rx_queue;
      44                 :          0 :         struct virtqueue *vq = virtnet_rxq_to_vq(rxvq);
      45                 :          0 :         struct virtio_hw *hw = vq->hw;
      46                 :            :         uint16_t nb_used, nb_total;
      47                 :            :         uint16_t desc_idx;
      48                 :            :         struct vring_used_elem *rused;
      49                 :            :         struct rte_mbuf **sw_ring;
      50                 :            :         struct rte_mbuf **sw_ring_end;
      51                 :            :         struct rte_mbuf **ref_rx_pkts;
      52                 :            :         uint16_t nb_pkts_received = 0;
      53                 :            :         __m128i shuf_msk1, shuf_msk2, len_adjust;
      54                 :            : 
      55                 :            :         shuf_msk1 = _mm_set_epi8(
      56                 :            :                 0xFF, 0xFF, 0xFF, 0xFF,
      57                 :            :                 0xFF, 0xFF,             /* vlan tci */
      58                 :            :                 5, 4,                   /* dat len */
      59                 :            :                 0xFF, 0xFF, 5, 4,       /* pkt len */
      60                 :            :                 0xFF, 0xFF, 0xFF, 0xFF  /* packet type */
      61                 :            : 
      62                 :            :         );
      63                 :            : 
      64                 :            :         shuf_msk2 = _mm_set_epi8(
      65                 :            :                 0xFF, 0xFF, 0xFF, 0xFF,
      66                 :            :                 0xFF, 0xFF,             /* vlan tci */
      67                 :            :                 13, 12,                 /* dat len */
      68                 :            :                 0xFF, 0xFF, 13, 12,     /* pkt len */
      69                 :            :                 0xFF, 0xFF, 0xFF, 0xFF  /* packet type */
      70                 :            :         );
      71                 :            : 
      72                 :            :         /* Subtract the header length.
      73                 :            :         *  In which case do we need the header length in used->len ?
      74                 :            :         */
      75                 :            :         len_adjust = _mm_set_epi16(
      76                 :            :                 0, 0,
      77                 :            :                 0,
      78                 :            :                 (uint16_t)-vq->hw->vtnet_hdr_size,
      79         [ #  # ]:          0 :                 0, (uint16_t)-vq->hw->vtnet_hdr_size,
      80                 :            :                 0, 0);
      81                 :            : 
      82         [ #  # ]:          0 :         if (unlikely(hw->started == 0))
      83                 :            :                 return nb_pkts_received;
      84                 :            : 
      85         [ #  # ]:          0 :         if (unlikely(nb_pkts < RTE_VIRTIO_DESC_PER_LOOP))
      86                 :            :                 return 0;
      87                 :            : 
      88         [ #  # ]:          0 :         if (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) {
      89                 :          0 :                 virtio_rxq_rearm_vec(rxvq);
      90         [ #  # ]:          0 :                 if (unlikely(virtqueue_kick_prepare(vq)))
      91                 :            :                         virtqueue_notify(vq);
      92                 :            :         }
      93                 :            : 
      94                 :            :         nb_used = virtqueue_nused(vq);
      95                 :            : 
      96         [ #  # ]:          0 :         if (unlikely(nb_used == 0))
      97                 :            :                 return 0;
      98                 :            : 
      99                 :          0 :         nb_pkts = RTE_ALIGN_FLOOR(nb_pkts, RTE_VIRTIO_DESC_PER_LOOP);
     100                 :          0 :         nb_used = RTE_MIN(nb_used, nb_pkts);
     101                 :            : 
     102                 :          0 :         desc_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
     103                 :          0 :         rused = &vq->vq_split.ring.used->ring[desc_idx];
     104                 :          0 :         sw_ring = &vq->rxq.sw_ring[desc_idx];
     105                 :          0 :         sw_ring_end = &vq->rxq.sw_ring[vq->vq_nentries];
     106                 :            : 
     107                 :            :         rte_prefetch0(rused);
     108                 :            : 
     109                 :            :         nb_total = nb_used;
     110                 :            :         ref_rx_pkts = rx_pkts;
     111                 :          0 :         for (nb_pkts_received = 0;
     112         [ #  # ]:          0 :                 nb_pkts_received < nb_total;) {
     113                 :            :                 __m128i desc[RTE_VIRTIO_DESC_PER_LOOP / 2];
     114                 :            :                 __m128i mbp[RTE_VIRTIO_DESC_PER_LOOP / 2];
     115                 :            :                 __m128i pkt_mb[RTE_VIRTIO_DESC_PER_LOOP];
     116                 :            : 
     117                 :            :                 mbp[0] = _mm_loadu_si128((__m128i *)(sw_ring + 0));
     118                 :            :                 desc[0] = _mm_loadu_si128((__m128i *)(rused + 0));
     119                 :            :                 _mm_storeu_si128((__m128i *)&rx_pkts[0], mbp[0]);
     120                 :            : 
     121                 :            :                 mbp[1] = _mm_loadu_si128((__m128i *)(sw_ring + 2));
     122                 :            :                 desc[1] = _mm_loadu_si128((__m128i *)(rused + 2));
     123                 :            :                 _mm_storeu_si128((__m128i *)&rx_pkts[2], mbp[1]);
     124                 :            : 
     125                 :            :                 mbp[2] = _mm_loadu_si128((__m128i *)(sw_ring + 4));
     126                 :            :                 desc[2] = _mm_loadu_si128((__m128i *)(rused + 4));
     127                 :            :                 _mm_storeu_si128((__m128i *)&rx_pkts[4], mbp[2]);
     128                 :            : 
     129                 :            :                 mbp[3] = _mm_loadu_si128((__m128i *)(sw_ring + 6));
     130                 :            :                 desc[3] = _mm_loadu_si128((__m128i *)(rused + 6));
     131                 :            :                 _mm_storeu_si128((__m128i *)&rx_pkts[6], mbp[3]);
     132                 :            : 
     133                 :            :                 pkt_mb[1] = _mm_shuffle_epi8(desc[0], shuf_msk2);
     134                 :            :                 pkt_mb[0] = _mm_shuffle_epi8(desc[0], shuf_msk1);
     135                 :            :                 pkt_mb[1] = _mm_add_epi16(pkt_mb[1], len_adjust);
     136                 :            :                 pkt_mb[0] = _mm_add_epi16(pkt_mb[0], len_adjust);
     137                 :            :                 _mm_storeu_si128((void *)&rx_pkts[1]->rx_descriptor_fields1,
     138                 :            :                         pkt_mb[1]);
     139                 :          0 :                 _mm_storeu_si128((void *)&rx_pkts[0]->rx_descriptor_fields1,
     140                 :            :                         pkt_mb[0]);
     141                 :            : 
     142                 :            :                 pkt_mb[3] = _mm_shuffle_epi8(desc[1], shuf_msk2);
     143                 :            :                 pkt_mb[2] = _mm_shuffle_epi8(desc[1], shuf_msk1);
     144                 :            :                 pkt_mb[3] = _mm_add_epi16(pkt_mb[3], len_adjust);
     145                 :            :                 pkt_mb[2] = _mm_add_epi16(pkt_mb[2], len_adjust);
     146                 :          0 :                 _mm_storeu_si128((void *)&rx_pkts[3]->rx_descriptor_fields1,
     147                 :            :                         pkt_mb[3]);
     148                 :          0 :                 _mm_storeu_si128((void *)&rx_pkts[2]->rx_descriptor_fields1,
     149                 :            :                         pkt_mb[2]);
     150                 :            : 
     151                 :            :                 pkt_mb[5] = _mm_shuffle_epi8(desc[2], shuf_msk2);
     152                 :            :                 pkt_mb[4] = _mm_shuffle_epi8(desc[2], shuf_msk1);
     153                 :            :                 pkt_mb[5] = _mm_add_epi16(pkt_mb[5], len_adjust);
     154                 :            :                 pkt_mb[4] = _mm_add_epi16(pkt_mb[4], len_adjust);
     155                 :          0 :                 _mm_storeu_si128((void *)&rx_pkts[5]->rx_descriptor_fields1,
     156                 :            :                         pkt_mb[5]);
     157                 :          0 :                 _mm_storeu_si128((void *)&rx_pkts[4]->rx_descriptor_fields1,
     158                 :            :                         pkt_mb[4]);
     159                 :            : 
     160                 :            :                 pkt_mb[7] = _mm_shuffle_epi8(desc[3], shuf_msk2);
     161                 :            :                 pkt_mb[6] = _mm_shuffle_epi8(desc[3], shuf_msk1);
     162                 :            :                 pkt_mb[7] = _mm_add_epi16(pkt_mb[7], len_adjust);
     163                 :            :                 pkt_mb[6] = _mm_add_epi16(pkt_mb[6], len_adjust);
     164                 :          0 :                 _mm_storeu_si128((void *)&rx_pkts[7]->rx_descriptor_fields1,
     165                 :            :                         pkt_mb[7]);
     166                 :          0 :                 _mm_storeu_si128((void *)&rx_pkts[6]->rx_descriptor_fields1,
     167                 :            :                         pkt_mb[6]);
     168                 :            : 
     169         [ #  # ]:          0 :                 if (unlikely(nb_used <= RTE_VIRTIO_DESC_PER_LOOP)) {
     170         [ #  # ]:          0 :                         if (sw_ring + nb_used <= sw_ring_end)
     171                 :          0 :                                 nb_pkts_received += nb_used;
     172                 :            :                         else
     173                 :          0 :                                 nb_pkts_received += sw_ring_end - sw_ring;
     174                 :            :                         break;
     175                 :            :                 } else {
     176         [ #  # ]:          0 :                         if (unlikely(sw_ring + RTE_VIRTIO_DESC_PER_LOOP >=
     177                 :            :                                 sw_ring_end)) {
     178                 :          0 :                                 nb_pkts_received += sw_ring_end - sw_ring;
     179                 :          0 :                                 break;
     180                 :            :                         } else {
     181                 :          0 :                                 nb_pkts_received += RTE_VIRTIO_DESC_PER_LOOP;
     182                 :            : 
     183                 :          0 :                                 rx_pkts += RTE_VIRTIO_DESC_PER_LOOP;
     184                 :            :                                 sw_ring += RTE_VIRTIO_DESC_PER_LOOP;
     185                 :          0 :                                 rused   += RTE_VIRTIO_DESC_PER_LOOP;
     186                 :          0 :                                 nb_used -= RTE_VIRTIO_DESC_PER_LOOP;
     187                 :            :                         }
     188                 :            :                 }
     189                 :            :         }
     190                 :            : 
     191                 :          0 :         vq->vq_used_cons_idx += nb_pkts_received;
     192                 :          0 :         vq->vq_free_cnt += nb_pkts_received;
     193                 :          0 :         rxvq->stats.packets += nb_pkts_received;
     194         [ #  # ]:          0 :         for (nb_used = 0; nb_used < nb_pkts_received; nb_used++)
     195                 :          0 :                 virtio_update_packet_stats(&rxvq->stats, ref_rx_pkts[nb_used]);
     196                 :            : 
     197                 :            :         return nb_pkts_received;
     198                 :            : }

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