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; 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 uint16_t nb_pkts_received = 0; 53 const vector unsigned char zero = {0}; 54 55 const vector unsigned char shuf_msk1 = { 56 0xFF, 0xFF, 0xFF, 0xFF, /* packet type */ 57 4, 5, 0xFF, 0xFF, /* vlan tci */ 58 4, 5, /* dat len */ 59 0xFF, 0xFF, /* vlan tci */ 60 0xFF, 0xFF, 0xFF, 0xFF 61 }; 62 63 const vector unsigned char shuf_msk2 = { 64 0xFF, 0xFF, 0xFF, 0xFF, /* packet type */ 65 12, 13, 0xFF, 0xFF, /* pkt len */ 66 12, 13, /* dat len */ 67 0xFF, 0xFF, /* vlan tci */ 68 0xFF, 0xFF, 0xFF, 0xFF 69 }; 70 71 /* 72 * Subtract the header length. 73 * In which case do we need the header length in used->len ? 74 */ 75 const vector unsigned short len_adjust = { 76 0, 0, 77 (uint16_t)-vq->hw->vtnet_hdr_size, 0, 78 (uint16_t)-vq->hw->vtnet_hdr_size, 0, 79 0, 0 80 }; 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 for (nb_pkts_received = 0; 112 nb_pkts_received < nb_used;) { 113 vector unsigned char desc[RTE_VIRTIO_DESC_PER_LOOP / 2]; 114 vector unsigned char mbp[RTE_VIRTIO_DESC_PER_LOOP / 2]; 115 vector unsigned char pkt_mb[RTE_VIRTIO_DESC_PER_LOOP]; 116 117 mbp[0] = vec_vsx_ld(0, (unsigned char const *)(sw_ring + 0)); 118 desc[0] = vec_vsx_ld(0, (unsigned char const *)(rused + 0)); 119 *(vector unsigned char *)&rx_pkts[0] = mbp[0]; 120 121 mbp[1] = vec_vsx_ld(0, (unsigned char const *)(sw_ring + 2)); 122 desc[1] = vec_vsx_ld(0, (unsigned char const *)(rused + 2)); 123 *(vector unsigned char *)&rx_pkts[2] = mbp[1]; 124 125 mbp[2] = vec_vsx_ld(0, (unsigned char const *)(sw_ring + 4)); 126 desc[2] = vec_vsx_ld(0, (unsigned char const *)(rused + 4)); 127 *(vector unsigned char *)&rx_pkts[4] = mbp[2]; 128 129 mbp[3] = vec_vsx_ld(0, (unsigned char const *)(sw_ring + 6)); 130 desc[3] = vec_vsx_ld(0, (unsigned char const *)(rused + 6)); 131 *(vector unsigned char *)&rx_pkts[6] = mbp[3]; 132 133 pkt_mb[0] = vec_perm(desc[0], zero, shuf_msk1); 134 pkt_mb[1] = vec_perm(desc[0], zero, shuf_msk2); 135 pkt_mb[0] = (vector unsigned char) 136 ((vector unsigned short)pkt_mb[0] + len_adjust); 137 pkt_mb[1] = (vector unsigned char) 138 ((vector unsigned short)pkt_mb[1] + len_adjust); 139 *(vector unsigned char *)&rx_pkts[0]->rx_descriptor_fields1 = 140 pkt_mb[0]; 141 *(vector unsigned char *)&rx_pkts[1]->rx_descriptor_fields1 = 142 pkt_mb[1]; 143 144 pkt_mb[2] = vec_perm(desc[1], zero, shuf_msk1); 145 pkt_mb[3] = vec_perm(desc[1], zero, shuf_msk2); 146 pkt_mb[2] = (vector unsigned char) 147 ((vector unsigned short)pkt_mb[2] + len_adjust); 148 pkt_mb[3] = (vector unsigned char) 149 ((vector unsigned short)pkt_mb[3] + len_adjust); 150 *(vector unsigned char *)&rx_pkts[2]->rx_descriptor_fields1 = 151 pkt_mb[2]; 152 *(vector unsigned char *)&rx_pkts[3]->rx_descriptor_fields1 = 153 pkt_mb[3]; 154 155 pkt_mb[4] = vec_perm(desc[2], zero, shuf_msk1); 156 pkt_mb[5] = vec_perm(desc[2], zero, shuf_msk2); 157 pkt_mb[4] = (vector unsigned char) 158 ((vector unsigned short)pkt_mb[4] + len_adjust); 159 pkt_mb[5] = (vector unsigned char) 160 ((vector unsigned short)pkt_mb[5] + len_adjust); 161 *(vector unsigned char *)&rx_pkts[4]->rx_descriptor_fields1 = 162 pkt_mb[4]; 163 *(vector unsigned char *)&rx_pkts[5]->rx_descriptor_fields1 = 164 pkt_mb[5]; 165 166 pkt_mb[6] = vec_perm(desc[3], zero, shuf_msk1); 167 pkt_mb[7] = vec_perm(desc[3], zero, shuf_msk2); 168 pkt_mb[6] = (vector unsigned char) 169 ((vector unsigned short)pkt_mb[6] + len_adjust); 170 pkt_mb[7] = (vector unsigned char) 171 ((vector unsigned short)pkt_mb[7] + len_adjust); 172 *(vector unsigned char *)&rx_pkts[6]->rx_descriptor_fields1 = 173 pkt_mb[6]; 174 *(vector unsigned char *)&rx_pkts[7]->rx_descriptor_fields1 = 175 pkt_mb[7]; 176 177 if (unlikely(nb_used <= RTE_VIRTIO_DESC_PER_LOOP)) { 178 if (sw_ring + nb_used <= sw_ring_end) 179 nb_pkts_received += nb_used; 180 else 181 nb_pkts_received += sw_ring_end - sw_ring; 182 break; 183 } else { 184 if (unlikely(sw_ring + RTE_VIRTIO_DESC_PER_LOOP >= 185 sw_ring_end)) { 186 nb_pkts_received += sw_ring_end - sw_ring; 187 break; 188 } else { 189 nb_pkts_received += RTE_VIRTIO_DESC_PER_LOOP; 190 191 rx_pkts += RTE_VIRTIO_DESC_PER_LOOP; 192 sw_ring += RTE_VIRTIO_DESC_PER_LOOP; 193 rused += RTE_VIRTIO_DESC_PER_LOOP; 194 nb_used -= RTE_VIRTIO_DESC_PER_LOOP; 195 } 196 } 197 } 198 199 vq->vq_used_cons_idx += nb_pkts_received; 200 vq->vq_free_cnt += nb_pkts_received; 201 rxvq->stats.packets += nb_pkts_received; 202 return nb_pkts_received; 203 } 204