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 <rte_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 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 struct virtqueue *vq = rxvq->vq; 45 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, (uint16_t)-vq->hw->vtnet_hdr_size, 80 0, 0); 81 82 if (unlikely(hw->started == 0)) 83 return nb_pkts_received; 84 85 if (unlikely(nb_pkts < RTE_VIRTIO_DESC_PER_LOOP)) 86 return 0; 87 88 nb_used = VIRTQUEUE_NUSED(vq); 89 90 rte_compiler_barrier(); 91 92 if (unlikely(nb_used == 0)) 93 return 0; 94 95 nb_pkts = RTE_ALIGN_FLOOR(nb_pkts, RTE_VIRTIO_DESC_PER_LOOP); 96 nb_used = RTE_MIN(nb_used, nb_pkts); 97 98 desc_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1)); 99 rused = &vq->vq_split.ring.used->ring[desc_idx]; 100 sw_ring = &vq->sw_ring[desc_idx]; 101 sw_ring_end = &vq->sw_ring[vq->vq_nentries]; 102 103 rte_prefetch0(rused); 104 105 if (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) { 106 virtio_rxq_rearm_vec(rxvq); 107 if (unlikely(virtqueue_kick_prepare(vq))) 108 virtqueue_notify(vq); 109 } 110 111 nb_total = nb_used; 112 ref_rx_pkts = rx_pkts; 113 for (nb_pkts_received = 0; 114 nb_pkts_received < nb_total;) { 115 __m128i desc[RTE_VIRTIO_DESC_PER_LOOP / 2]; 116 __m128i mbp[RTE_VIRTIO_DESC_PER_LOOP / 2]; 117 __m128i pkt_mb[RTE_VIRTIO_DESC_PER_LOOP]; 118 119 mbp[0] = _mm_loadu_si128((__m128i *)(sw_ring + 0)); 120 desc[0] = _mm_loadu_si128((__m128i *)(rused + 0)); 121 _mm_storeu_si128((__m128i *)&rx_pkts[0], mbp[0]); 122 123 mbp[1] = _mm_loadu_si128((__m128i *)(sw_ring + 2)); 124 desc[1] = _mm_loadu_si128((__m128i *)(rused + 2)); 125 _mm_storeu_si128((__m128i *)&rx_pkts[2], mbp[1]); 126 127 mbp[2] = _mm_loadu_si128((__m128i *)(sw_ring + 4)); 128 desc[2] = _mm_loadu_si128((__m128i *)(rused + 4)); 129 _mm_storeu_si128((__m128i *)&rx_pkts[4], mbp[2]); 130 131 mbp[3] = _mm_loadu_si128((__m128i *)(sw_ring + 6)); 132 desc[3] = _mm_loadu_si128((__m128i *)(rused + 6)); 133 _mm_storeu_si128((__m128i *)&rx_pkts[6], mbp[3]); 134 135 pkt_mb[1] = _mm_shuffle_epi8(desc[0], shuf_msk2); 136 pkt_mb[0] = _mm_shuffle_epi8(desc[0], shuf_msk1); 137 pkt_mb[1] = _mm_add_epi16(pkt_mb[1], len_adjust); 138 pkt_mb[0] = _mm_add_epi16(pkt_mb[0], len_adjust); 139 _mm_storeu_si128((void *)&rx_pkts[1]->rx_descriptor_fields1, 140 pkt_mb[1]); 141 _mm_storeu_si128((void *)&rx_pkts[0]->rx_descriptor_fields1, 142 pkt_mb[0]); 143 144 pkt_mb[3] = _mm_shuffle_epi8(desc[1], shuf_msk2); 145 pkt_mb[2] = _mm_shuffle_epi8(desc[1], shuf_msk1); 146 pkt_mb[3] = _mm_add_epi16(pkt_mb[3], len_adjust); 147 pkt_mb[2] = _mm_add_epi16(pkt_mb[2], len_adjust); 148 _mm_storeu_si128((void *)&rx_pkts[3]->rx_descriptor_fields1, 149 pkt_mb[3]); 150 _mm_storeu_si128((void *)&rx_pkts[2]->rx_descriptor_fields1, 151 pkt_mb[2]); 152 153 pkt_mb[5] = _mm_shuffle_epi8(desc[2], shuf_msk2); 154 pkt_mb[4] = _mm_shuffle_epi8(desc[2], shuf_msk1); 155 pkt_mb[5] = _mm_add_epi16(pkt_mb[5], len_adjust); 156 pkt_mb[4] = _mm_add_epi16(pkt_mb[4], len_adjust); 157 _mm_storeu_si128((void *)&rx_pkts[5]->rx_descriptor_fields1, 158 pkt_mb[5]); 159 _mm_storeu_si128((void *)&rx_pkts[4]->rx_descriptor_fields1, 160 pkt_mb[4]); 161 162 pkt_mb[7] = _mm_shuffle_epi8(desc[3], shuf_msk2); 163 pkt_mb[6] = _mm_shuffle_epi8(desc[3], shuf_msk1); 164 pkt_mb[7] = _mm_add_epi16(pkt_mb[7], len_adjust); 165 pkt_mb[6] = _mm_add_epi16(pkt_mb[6], len_adjust); 166 _mm_storeu_si128((void *)&rx_pkts[7]->rx_descriptor_fields1, 167 pkt_mb[7]); 168 _mm_storeu_si128((void *)&rx_pkts[6]->rx_descriptor_fields1, 169 pkt_mb[6]); 170 171 if (unlikely(nb_used <= RTE_VIRTIO_DESC_PER_LOOP)) { 172 if (sw_ring + nb_used <= sw_ring_end) 173 nb_pkts_received += nb_used; 174 else 175 nb_pkts_received += sw_ring_end - sw_ring; 176 break; 177 } else { 178 if (unlikely(sw_ring + RTE_VIRTIO_DESC_PER_LOOP >= 179 sw_ring_end)) { 180 nb_pkts_received += sw_ring_end - sw_ring; 181 break; 182 } else { 183 nb_pkts_received += RTE_VIRTIO_DESC_PER_LOOP; 184 185 rx_pkts += RTE_VIRTIO_DESC_PER_LOOP; 186 sw_ring += RTE_VIRTIO_DESC_PER_LOOP; 187 rused += RTE_VIRTIO_DESC_PER_LOOP; 188 nb_used -= RTE_VIRTIO_DESC_PER_LOOP; 189 } 190 } 191 } 192 193 vq->vq_used_cons_idx += nb_pkts_received; 194 vq->vq_free_cnt += nb_pkts_received; 195 rxvq->stats.packets += nb_pkts_received; 196 for (nb_used = 0; nb_used < nb_pkts_received; nb_used++) 197 virtio_update_packet_stats(&rxvq->stats, ref_rx_pkts[nb_used]); 198 199 return nb_pkts_received; 200 } 201