1 /* SPDX-License-Identifier: BSD-3-Clause 2 * Copyright(c) 2016 Cavium, Inc 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 <rte_byteorder.h> 12 #include <rte_branch_prediction.h> 13 #include <rte_cycles.h> 14 #include <rte_ether.h> 15 #include <rte_ethdev_driver.h> 16 #include <rte_errno.h> 17 #include <rte_memory.h> 18 #include <rte_mempool.h> 19 #include <rte_malloc.h> 20 #include <rte_mbuf.h> 21 #include <rte_prefetch.h> 22 #include <rte_string_fns.h> 23 #include <rte_vect.h> 24 25 #include "virtio_rxtx_simple.h" 26 27 #define RTE_VIRTIO_DESC_PER_LOOP 8 28 29 /* virtio vPMD receive routine, only accept(nb_pkts >= RTE_VIRTIO_DESC_PER_LOOP) 30 * 31 * This routine is for non-mergeable RX, one desc for each guest buffer. 32 * This routine is based on the RX ring layout optimization. Each entry in the 33 * avail ring points to the desc with the same index in the desc ring and this 34 * will never be changed in the driver. 35 * 36 * - nb_pkts < RTE_VIRTIO_DESC_PER_LOOP, just return no packet 37 */ 38 uint16_t 39 virtio_recv_pkts_vec(void *rx_queue, 40 struct rte_mbuf **__rte_restrict 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 54 uint8x16_t shuf_msk1 = { 55 0xFF, 0xFF, 0xFF, 0xFF, /* packet type */ 56 4, 5, 0xFF, 0xFF, /* pkt len */ 57 4, 5, /* dat len */ 58 0xFF, 0xFF, /* vlan tci */ 59 0xFF, 0xFF, 0xFF, 0xFF 60 }; 61 62 uint8x16_t shuf_msk2 = { 63 0xFF, 0xFF, 0xFF, 0xFF, /* packet type */ 64 12, 13, 0xFF, 0xFF, /* pkt len */ 65 12, 13, /* dat len */ 66 0xFF, 0xFF, /* vlan tci */ 67 0xFF, 0xFF, 0xFF, 0xFF 68 }; 69 70 /* Subtract the header length. 71 * In which case do we need the header length in used->len ? 72 */ 73 uint16x8_t len_adjust = { 74 0, 0, 75 (uint16_t)hw->vtnet_hdr_size, 0, 76 (uint16_t)hw->vtnet_hdr_size, 77 0, 78 0, 0 79 }; 80 81 if (unlikely(hw->started == 0)) 82 return nb_pkts_received; 83 84 if (unlikely(nb_pkts < RTE_VIRTIO_DESC_PER_LOOP)) 85 return 0; 86 87 /* virtqueue_nused has a load-acquire or rte_cio_rmb inside */ 88 nb_used = virtqueue_nused(vq); 89 90 if (unlikely(nb_used == 0)) 91 return 0; 92 93 nb_pkts = RTE_ALIGN_FLOOR(nb_pkts, RTE_VIRTIO_DESC_PER_LOOP); 94 nb_used = RTE_MIN(nb_used, nb_pkts); 95 96 desc_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1)); 97 rused = &vq->vq_split.ring.used->ring[desc_idx]; 98 sw_ring = &vq->sw_ring[desc_idx]; 99 sw_ring_end = &vq->sw_ring[vq->vq_nentries]; 100 101 rte_prefetch_non_temporal(rused); 102 103 if (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) { 104 virtio_rxq_rearm_vec(rxvq); 105 if (unlikely(virtqueue_kick_prepare(vq))) 106 virtqueue_notify(vq); 107 } 108 109 nb_total = nb_used; 110 ref_rx_pkts = rx_pkts; 111 for (nb_pkts_received = 0; 112 nb_pkts_received < nb_total;) { 113 uint64x2_t desc[RTE_VIRTIO_DESC_PER_LOOP / 2]; 114 uint64x2_t mbp[RTE_VIRTIO_DESC_PER_LOOP / 2]; 115 uint64x2_t pkt_mb[RTE_VIRTIO_DESC_PER_LOOP]; 116 117 mbp[0] = vld1q_u64((uint64_t *)(sw_ring + 0)); 118 desc[0] = vld1q_u64((uint64_t *)(rused + 0)); 119 vst1q_u64((uint64_t *)&rx_pkts[0], mbp[0]); 120 121 mbp[1] = vld1q_u64((uint64_t *)(sw_ring + 2)); 122 desc[1] = vld1q_u64((uint64_t *)(rused + 2)); 123 vst1q_u64((uint64_t *)&rx_pkts[2], mbp[1]); 124 125 mbp[2] = vld1q_u64((uint64_t *)(sw_ring + 4)); 126 desc[2] = vld1q_u64((uint64_t *)(rused + 4)); 127 vst1q_u64((uint64_t *)&rx_pkts[4], mbp[2]); 128 129 mbp[3] = vld1q_u64((uint64_t *)(sw_ring + 6)); 130 desc[3] = vld1q_u64((uint64_t *)(rused + 6)); 131 vst1q_u64((uint64_t *)&rx_pkts[6], mbp[3]); 132 133 pkt_mb[1] = vreinterpretq_u64_u8(vqtbl1q_u8( 134 vreinterpretq_u8_u64(desc[0]), shuf_msk2)); 135 pkt_mb[0] = vreinterpretq_u64_u8(vqtbl1q_u8( 136 vreinterpretq_u8_u64(desc[0]), shuf_msk1)); 137 pkt_mb[1] = vreinterpretq_u64_u16(vsubq_u16( 138 vreinterpretq_u16_u64(pkt_mb[1]), len_adjust)); 139 pkt_mb[0] = vreinterpretq_u64_u16(vsubq_u16( 140 vreinterpretq_u16_u64(pkt_mb[0]), len_adjust)); 141 vst1q_u64((void *)&rx_pkts[1]->rx_descriptor_fields1, 142 pkt_mb[1]); 143 vst1q_u64((void *)&rx_pkts[0]->rx_descriptor_fields1, 144 pkt_mb[0]); 145 146 pkt_mb[3] = vreinterpretq_u64_u8(vqtbl1q_u8( 147 vreinterpretq_u8_u64(desc[1]), shuf_msk2)); 148 pkt_mb[2] = vreinterpretq_u64_u8(vqtbl1q_u8( 149 vreinterpretq_u8_u64(desc[1]), shuf_msk1)); 150 pkt_mb[3] = vreinterpretq_u64_u16(vsubq_u16( 151 vreinterpretq_u16_u64(pkt_mb[3]), len_adjust)); 152 pkt_mb[2] = vreinterpretq_u64_u16(vsubq_u16( 153 vreinterpretq_u16_u64(pkt_mb[2]), len_adjust)); 154 vst1q_u64((void *)&rx_pkts[3]->rx_descriptor_fields1, 155 pkt_mb[3]); 156 vst1q_u64((void *)&rx_pkts[2]->rx_descriptor_fields1, 157 pkt_mb[2]); 158 159 pkt_mb[5] = vreinterpretq_u64_u8(vqtbl1q_u8( 160 vreinterpretq_u8_u64(desc[2]), shuf_msk2)); 161 pkt_mb[4] = vreinterpretq_u64_u8(vqtbl1q_u8( 162 vreinterpretq_u8_u64(desc[2]), shuf_msk1)); 163 pkt_mb[5] = vreinterpretq_u64_u16(vsubq_u16( 164 vreinterpretq_u16_u64(pkt_mb[5]), len_adjust)); 165 pkt_mb[4] = vreinterpretq_u64_u16(vsubq_u16( 166 vreinterpretq_u16_u64(pkt_mb[4]), len_adjust)); 167 vst1q_u64((void *)&rx_pkts[5]->rx_descriptor_fields1, 168 pkt_mb[5]); 169 vst1q_u64((void *)&rx_pkts[4]->rx_descriptor_fields1, 170 pkt_mb[4]); 171 172 pkt_mb[7] = vreinterpretq_u64_u8(vqtbl1q_u8( 173 vreinterpretq_u8_u64(desc[3]), shuf_msk2)); 174 pkt_mb[6] = vreinterpretq_u64_u8(vqtbl1q_u8( 175 vreinterpretq_u8_u64(desc[3]), shuf_msk1)); 176 pkt_mb[7] = vreinterpretq_u64_u16(vsubq_u16( 177 vreinterpretq_u16_u64(pkt_mb[7]), len_adjust)); 178 pkt_mb[6] = vreinterpretq_u64_u16(vsubq_u16( 179 vreinterpretq_u16_u64(pkt_mb[6]), len_adjust)); 180 vst1q_u64((void *)&rx_pkts[7]->rx_descriptor_fields1, 181 pkt_mb[7]); 182 vst1q_u64((void *)&rx_pkts[6]->rx_descriptor_fields1, 183 pkt_mb[6]); 184 185 if (unlikely(nb_used <= RTE_VIRTIO_DESC_PER_LOOP)) { 186 if (sw_ring + nb_used <= sw_ring_end) 187 nb_pkts_received += nb_used; 188 else 189 nb_pkts_received += sw_ring_end - sw_ring; 190 break; 191 } else { 192 if (unlikely(sw_ring + RTE_VIRTIO_DESC_PER_LOOP >= 193 sw_ring_end)) { 194 nb_pkts_received += sw_ring_end - sw_ring; 195 break; 196 } else { 197 nb_pkts_received += RTE_VIRTIO_DESC_PER_LOOP; 198 199 rx_pkts += RTE_VIRTIO_DESC_PER_LOOP; 200 sw_ring += RTE_VIRTIO_DESC_PER_LOOP; 201 rused += RTE_VIRTIO_DESC_PER_LOOP; 202 nb_used -= RTE_VIRTIO_DESC_PER_LOOP; 203 } 204 } 205 } 206 207 vq->vq_used_cons_idx += nb_pkts_received; 208 vq->vq_free_cnt += nb_pkts_received; 209 rxvq->stats.packets += nb_pkts_received; 210 for (nb_used = 0; nb_used < nb_pkts_received; nb_used++) 211 virtio_update_packet_stats(&rxvq->stats, ref_rx_pkts[nb_used]); 212 213 return nb_pkts_received; 214 } 215