1 /* SPDX-License-Identifier: BSD-3-Clause 2 * Copyright(c) 2010-2015 Intel Corporation 3 * Copyright(C) 2019 IBM Corporation 4 */ 5 6 #include <stdint.h> 7 #include <stdio.h> 8 #include <stdlib.h> 9 #include <string.h> 10 #include <errno.h> 11 12 #include <altivec.h> 13 14 #include <rte_byteorder.h> 15 #include <rte_branch_prediction.h> 16 #include <rte_cycles.h> 17 #include <rte_ether.h> 18 #include <rte_ethdev_driver.h> 19 #include <rte_errno.h> 20 #include <rte_memory.h> 21 #include <rte_mempool.h> 22 #include <rte_malloc.h> 23 #include <rte_mbuf.h> 24 #include <rte_prefetch.h> 25 #include <rte_string_fns.h> 26 27 #include "virtio_rxtx_simple.h" 28 29 #define RTE_VIRTIO_DESC_PER_LOOP 8 30 31 /* virtio vPMD receive routine, only accept(nb_pkts >= RTE_VIRTIO_DESC_PER_LOOP) 32 * 33 * This routine is for non-mergeable RX, one desc for each guest buffer. 34 * This routine is based on the RX ring layout optimization. Each entry in the 35 * avail ring points to the desc with the same index in the desc ring and this 36 * will never be changed in the driver. 37 * 38 * - nb_pkts < RTE_VIRTIO_DESC_PER_LOOP, just return no packet 39 */ 40 uint16_t 41 virtio_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts, 42 uint16_t nb_pkts) 43 { 44 struct virtnet_rx *rxvq = rx_queue; 45 struct virtqueue *vq = rxvq->vq; 46 struct virtio_hw *hw = vq->hw; 47 uint16_t nb_used, nb_total; 48 uint16_t desc_idx; 49 struct vring_used_elem *rused; 50 struct rte_mbuf **sw_ring; 51 struct rte_mbuf **sw_ring_end; 52 struct rte_mbuf **ref_rx_pkts; 53 uint16_t nb_pkts_received = 0; 54 const vector unsigned char zero = {0}; 55 56 const vector unsigned char shuf_msk1 = { 57 0xFF, 0xFF, 0xFF, 0xFF, /* packet type */ 58 4, 5, 0xFF, 0xFF, /* vlan tci */ 59 4, 5, /* dat len */ 60 0xFF, 0xFF, /* vlan tci */ 61 0xFF, 0xFF, 0xFF, 0xFF 62 }; 63 64 const vector unsigned char shuf_msk2 = { 65 0xFF, 0xFF, 0xFF, 0xFF, /* packet type */ 66 12, 13, 0xFF, 0xFF, /* pkt len */ 67 12, 13, /* dat len */ 68 0xFF, 0xFF, /* vlan tci */ 69 0xFF, 0xFF, 0xFF, 0xFF 70 }; 71 72 /* 73 * Subtract the header length. 74 * In which case do we need the header length in used->len ? 75 */ 76 const vector unsigned short len_adjust = { 77 0, 0, 78 (uint16_t)-vq->hw->vtnet_hdr_size, 0, 79 (uint16_t)-vq->hw->vtnet_hdr_size, 0, 80 0, 0 81 }; 82 83 if (unlikely(hw->started == 0)) 84 return nb_pkts_received; 85 86 if (unlikely(nb_pkts < RTE_VIRTIO_DESC_PER_LOOP)) 87 return 0; 88 89 nb_used = VIRTQUEUE_NUSED(vq); 90 91 rte_compiler_barrier(); 92 93 if (unlikely(nb_used == 0)) 94 return 0; 95 96 nb_pkts = RTE_ALIGN_FLOOR(nb_pkts, RTE_VIRTIO_DESC_PER_LOOP); 97 nb_used = RTE_MIN(nb_used, nb_pkts); 98 99 desc_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1)); 100 rused = &vq->vq_split.ring.used->ring[desc_idx]; 101 sw_ring = &vq->sw_ring[desc_idx]; 102 sw_ring_end = &vq->sw_ring[vq->vq_nentries]; 103 104 rte_prefetch0(rused); 105 106 if (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) { 107 virtio_rxq_rearm_vec(rxvq); 108 if (unlikely(virtqueue_kick_prepare(vq))) 109 virtqueue_notify(vq); 110 } 111 112 nb_total = nb_used; 113 ref_rx_pkts = rx_pkts; 114 for (nb_pkts_received = 0; 115 nb_pkts_received < nb_total;) { 116 vector unsigned char desc[RTE_VIRTIO_DESC_PER_LOOP / 2]; 117 vector unsigned char mbp[RTE_VIRTIO_DESC_PER_LOOP / 2]; 118 vector unsigned char pkt_mb[RTE_VIRTIO_DESC_PER_LOOP]; 119 120 mbp[0] = vec_vsx_ld(0, (unsigned char const *)(sw_ring + 0)); 121 desc[0] = vec_vsx_ld(0, (unsigned char const *)(rused + 0)); 122 *(vector unsigned char *)&rx_pkts[0] = mbp[0]; 123 124 mbp[1] = vec_vsx_ld(0, (unsigned char const *)(sw_ring + 2)); 125 desc[1] = vec_vsx_ld(0, (unsigned char const *)(rused + 2)); 126 *(vector unsigned char *)&rx_pkts[2] = mbp[1]; 127 128 mbp[2] = vec_vsx_ld(0, (unsigned char const *)(sw_ring + 4)); 129 desc[2] = vec_vsx_ld(0, (unsigned char const *)(rused + 4)); 130 *(vector unsigned char *)&rx_pkts[4] = mbp[2]; 131 132 mbp[3] = vec_vsx_ld(0, (unsigned char const *)(sw_ring + 6)); 133 desc[3] = vec_vsx_ld(0, (unsigned char const *)(rused + 6)); 134 *(vector unsigned char *)&rx_pkts[6] = mbp[3]; 135 136 pkt_mb[0] = vec_perm(desc[0], zero, shuf_msk1); 137 pkt_mb[1] = vec_perm(desc[0], zero, shuf_msk2); 138 pkt_mb[0] = (vector unsigned char) 139 ((vector unsigned short)pkt_mb[0] + len_adjust); 140 pkt_mb[1] = (vector unsigned char) 141 ((vector unsigned short)pkt_mb[1] + len_adjust); 142 *(vector unsigned char *)&rx_pkts[0]->rx_descriptor_fields1 = 143 pkt_mb[0]; 144 *(vector unsigned char *)&rx_pkts[1]->rx_descriptor_fields1 = 145 pkt_mb[1]; 146 147 pkt_mb[2] = vec_perm(desc[1], zero, shuf_msk1); 148 pkt_mb[3] = vec_perm(desc[1], zero, shuf_msk2); 149 pkt_mb[2] = (vector unsigned char) 150 ((vector unsigned short)pkt_mb[2] + len_adjust); 151 pkt_mb[3] = (vector unsigned char) 152 ((vector unsigned short)pkt_mb[3] + len_adjust); 153 *(vector unsigned char *)&rx_pkts[2]->rx_descriptor_fields1 = 154 pkt_mb[2]; 155 *(vector unsigned char *)&rx_pkts[3]->rx_descriptor_fields1 = 156 pkt_mb[3]; 157 158 pkt_mb[4] = vec_perm(desc[2], zero, shuf_msk1); 159 pkt_mb[5] = vec_perm(desc[2], zero, shuf_msk2); 160 pkt_mb[4] = (vector unsigned char) 161 ((vector unsigned short)pkt_mb[4] + len_adjust); 162 pkt_mb[5] = (vector unsigned char) 163 ((vector unsigned short)pkt_mb[5] + len_adjust); 164 *(vector unsigned char *)&rx_pkts[4]->rx_descriptor_fields1 = 165 pkt_mb[4]; 166 *(vector unsigned char *)&rx_pkts[5]->rx_descriptor_fields1 = 167 pkt_mb[5]; 168 169 pkt_mb[6] = vec_perm(desc[3], zero, shuf_msk1); 170 pkt_mb[7] = vec_perm(desc[3], zero, shuf_msk2); 171 pkt_mb[6] = (vector unsigned char) 172 ((vector unsigned short)pkt_mb[6] + len_adjust); 173 pkt_mb[7] = (vector unsigned char) 174 ((vector unsigned short)pkt_mb[7] + len_adjust); 175 *(vector unsigned char *)&rx_pkts[6]->rx_descriptor_fields1 = 176 pkt_mb[6]; 177 *(vector unsigned char *)&rx_pkts[7]->rx_descriptor_fields1 = 178 pkt_mb[7]; 179 180 if (unlikely(nb_used <= RTE_VIRTIO_DESC_PER_LOOP)) { 181 if (sw_ring + nb_used <= sw_ring_end) 182 nb_pkts_received += nb_used; 183 else 184 nb_pkts_received += sw_ring_end - sw_ring; 185 break; 186 } else { 187 if (unlikely(sw_ring + RTE_VIRTIO_DESC_PER_LOOP >= 188 sw_ring_end)) { 189 nb_pkts_received += sw_ring_end - sw_ring; 190 break; 191 } else { 192 nb_pkts_received += RTE_VIRTIO_DESC_PER_LOOP; 193 194 rx_pkts += RTE_VIRTIO_DESC_PER_LOOP; 195 sw_ring += RTE_VIRTIO_DESC_PER_LOOP; 196 rused += RTE_VIRTIO_DESC_PER_LOOP; 197 nb_used -= RTE_VIRTIO_DESC_PER_LOOP; 198 } 199 } 200 } 201 202 vq->vq_used_cons_idx += nb_pkts_received; 203 vq->vq_free_cnt += nb_pkts_received; 204 rxvq->stats.packets += nb_pkts_received; 205 for (nb_used = 0; nb_used < nb_pkts_received; nb_used++) 206 virtio_update_packet_stats(&rxvq->stats, ref_rx_pkts[nb_used]); 207 208 return nb_pkts_received; 209 } 210