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, struct rte_mbuf **rx_pkts, 40 uint16_t nb_pkts) 41 { 42 struct virtnet_rx *rxvq = rx_queue; 43 struct virtqueue *vq = rxvq->vq; 44 struct virtio_hw *hw = vq->hw; 45 uint16_t nb_used; 46 uint16_t desc_idx; 47 struct vring_used_elem *rused; 48 struct rte_mbuf **sw_ring; 49 struct rte_mbuf **sw_ring_end; 50 uint16_t nb_pkts_received = 0; 51 52 uint8x16_t shuf_msk1 = { 53 0xFF, 0xFF, 0xFF, 0xFF, /* packet type */ 54 4, 5, 0xFF, 0xFF, /* pkt len */ 55 4, 5, /* dat len */ 56 0xFF, 0xFF, /* vlan tci */ 57 0xFF, 0xFF, 0xFF, 0xFF 58 }; 59 60 uint8x16_t shuf_msk2 = { 61 0xFF, 0xFF, 0xFF, 0xFF, /* packet type */ 62 12, 13, 0xFF, 0xFF, /* pkt len */ 63 12, 13, /* dat len */ 64 0xFF, 0xFF, /* vlan tci */ 65 0xFF, 0xFF, 0xFF, 0xFF 66 }; 67 68 /* Subtract the header length. 69 * In which case do we need the header length in used->len ? 70 */ 71 uint16x8_t len_adjust = { 72 0, 0, 73 (uint16_t)vq->hw->vtnet_hdr_size, 0, 74 (uint16_t)vq->hw->vtnet_hdr_size, 75 0, 76 0, 0 77 }; 78 79 if (unlikely(hw->started == 0)) 80 return nb_pkts_received; 81 82 if (unlikely(nb_pkts < RTE_VIRTIO_DESC_PER_LOOP)) 83 return 0; 84 85 nb_used = VIRTQUEUE_NUSED(vq); 86 87 rte_rmb(); 88 89 if (unlikely(nb_used == 0)) 90 return 0; 91 92 nb_pkts = RTE_ALIGN_FLOOR(nb_pkts, RTE_VIRTIO_DESC_PER_LOOP); 93 nb_used = RTE_MIN(nb_used, nb_pkts); 94 95 desc_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1)); 96 rused = &vq->vq_ring.used->ring[desc_idx]; 97 sw_ring = &vq->sw_ring[desc_idx]; 98 sw_ring_end = &vq->sw_ring[vq->vq_nentries]; 99 100 rte_prefetch_non_temporal(rused); 101 102 if (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) { 103 virtio_rxq_rearm_vec(rxvq); 104 if (unlikely(virtqueue_kick_prepare(vq))) 105 virtqueue_notify(vq); 106 } 107 108 for (nb_pkts_received = 0; 109 nb_pkts_received < nb_used;) { 110 uint64x2_t desc[RTE_VIRTIO_DESC_PER_LOOP / 2]; 111 uint64x2_t mbp[RTE_VIRTIO_DESC_PER_LOOP / 2]; 112 uint64x2_t pkt_mb[RTE_VIRTIO_DESC_PER_LOOP]; 113 114 mbp[0] = vld1q_u64((uint64_t *)(sw_ring + 0)); 115 desc[0] = vld1q_u64((uint64_t *)(rused + 0)); 116 vst1q_u64((uint64_t *)&rx_pkts[0], mbp[0]); 117 118 mbp[1] = vld1q_u64((uint64_t *)(sw_ring + 2)); 119 desc[1] = vld1q_u64((uint64_t *)(rused + 2)); 120 vst1q_u64((uint64_t *)&rx_pkts[2], mbp[1]); 121 122 mbp[2] = vld1q_u64((uint64_t *)(sw_ring + 4)); 123 desc[2] = vld1q_u64((uint64_t *)(rused + 4)); 124 vst1q_u64((uint64_t *)&rx_pkts[4], mbp[2]); 125 126 mbp[3] = vld1q_u64((uint64_t *)(sw_ring + 6)); 127 desc[3] = vld1q_u64((uint64_t *)(rused + 6)); 128 vst1q_u64((uint64_t *)&rx_pkts[6], mbp[3]); 129 130 pkt_mb[1] = vreinterpretq_u64_u8(vqtbl1q_u8( 131 vreinterpretq_u8_u64(desc[0]), shuf_msk2)); 132 pkt_mb[0] = vreinterpretq_u64_u8(vqtbl1q_u8( 133 vreinterpretq_u8_u64(desc[0]), shuf_msk1)); 134 pkt_mb[1] = vreinterpretq_u64_u16(vsubq_u16( 135 vreinterpretq_u16_u64(pkt_mb[1]), len_adjust)); 136 pkt_mb[0] = vreinterpretq_u64_u16(vsubq_u16( 137 vreinterpretq_u16_u64(pkt_mb[0]), len_adjust)); 138 vst1q_u64((void *)&rx_pkts[1]->rx_descriptor_fields1, 139 pkt_mb[1]); 140 vst1q_u64((void *)&rx_pkts[0]->rx_descriptor_fields1, 141 pkt_mb[0]); 142 143 pkt_mb[3] = vreinterpretq_u64_u8(vqtbl1q_u8( 144 vreinterpretq_u8_u64(desc[1]), shuf_msk2)); 145 pkt_mb[2] = vreinterpretq_u64_u8(vqtbl1q_u8( 146 vreinterpretq_u8_u64(desc[1]), shuf_msk1)); 147 pkt_mb[3] = vreinterpretq_u64_u16(vsubq_u16( 148 vreinterpretq_u16_u64(pkt_mb[3]), len_adjust)); 149 pkt_mb[2] = vreinterpretq_u64_u16(vsubq_u16( 150 vreinterpretq_u16_u64(pkt_mb[2]), len_adjust)); 151 vst1q_u64((void *)&rx_pkts[3]->rx_descriptor_fields1, 152 pkt_mb[3]); 153 vst1q_u64((void *)&rx_pkts[2]->rx_descriptor_fields1, 154 pkt_mb[2]); 155 156 pkt_mb[5] = vreinterpretq_u64_u8(vqtbl1q_u8( 157 vreinterpretq_u8_u64(desc[2]), shuf_msk2)); 158 pkt_mb[4] = vreinterpretq_u64_u8(vqtbl1q_u8( 159 vreinterpretq_u8_u64(desc[2]), shuf_msk1)); 160 pkt_mb[5] = vreinterpretq_u64_u16(vsubq_u16( 161 vreinterpretq_u16_u64(pkt_mb[5]), len_adjust)); 162 pkt_mb[4] = vreinterpretq_u64_u16(vsubq_u16( 163 vreinterpretq_u16_u64(pkt_mb[4]), len_adjust)); 164 vst1q_u64((void *)&rx_pkts[5]->rx_descriptor_fields1, 165 pkt_mb[5]); 166 vst1q_u64((void *)&rx_pkts[4]->rx_descriptor_fields1, 167 pkt_mb[4]); 168 169 pkt_mb[7] = vreinterpretq_u64_u8(vqtbl1q_u8( 170 vreinterpretq_u8_u64(desc[3]), shuf_msk2)); 171 pkt_mb[6] = vreinterpretq_u64_u8(vqtbl1q_u8( 172 vreinterpretq_u8_u64(desc[3]), shuf_msk1)); 173 pkt_mb[7] = vreinterpretq_u64_u16(vsubq_u16( 174 vreinterpretq_u16_u64(pkt_mb[7]), len_adjust)); 175 pkt_mb[6] = vreinterpretq_u64_u16(vsubq_u16( 176 vreinterpretq_u16_u64(pkt_mb[6]), len_adjust)); 177 vst1q_u64((void *)&rx_pkts[7]->rx_descriptor_fields1, 178 pkt_mb[7]); 179 vst1q_u64((void *)&rx_pkts[6]->rx_descriptor_fields1, 180 pkt_mb[6]); 181 182 if (unlikely(nb_used <= RTE_VIRTIO_DESC_PER_LOOP)) { 183 if (sw_ring + nb_used <= sw_ring_end) 184 nb_pkts_received += nb_used; 185 else 186 nb_pkts_received += sw_ring_end - sw_ring; 187 break; 188 } else { 189 if (unlikely(sw_ring + RTE_VIRTIO_DESC_PER_LOOP >= 190 sw_ring_end)) { 191 nb_pkts_received += sw_ring_end - sw_ring; 192 break; 193 } else { 194 nb_pkts_received += RTE_VIRTIO_DESC_PER_LOOP; 195 196 rx_pkts += RTE_VIRTIO_DESC_PER_LOOP; 197 sw_ring += RTE_VIRTIO_DESC_PER_LOOP; 198 rused += RTE_VIRTIO_DESC_PER_LOOP; 199 nb_used -= RTE_VIRTIO_DESC_PER_LOOP; 200 } 201 } 202 } 203 204 vq->vq_used_cons_idx += nb_pkts_received; 205 vq->vq_free_cnt += nb_pkts_received; 206 rxvq->stats.packets += nb_pkts_received; 207 return nb_pkts_received; 208 } 209