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 <rte_cycles.h> 12 #include <rte_memory.h> 13 #include <rte_branch_prediction.h> 14 #include <rte_mempool.h> 15 #include <rte_malloc.h> 16 #include <rte_mbuf.h> 17 #include <rte_ether.h> 18 #include <rte_ethdev_driver.h> 19 #include <rte_prefetch.h> 20 #include <rte_string_fns.h> 21 #include <rte_errno.h> 22 #include <rte_byteorder.h> 23 24 #include "virtio_rxtx_simple.h" 25 26 #ifndef __INTEL_COMPILER 27 #pragma GCC diagnostic ignored "-Wcast-qual" 28 #endif 29 30 int __attribute__((cold)) 31 virtqueue_enqueue_recv_refill_simple(struct virtqueue *vq, 32 struct rte_mbuf *cookie) 33 { 34 struct vq_desc_extra *dxp; 35 struct vring_desc *start_dp; 36 uint16_t desc_idx; 37 38 cookie->port = vq->rxq.port_id; 39 40 desc_idx = vq->vq_avail_idx & (vq->vq_nentries - 1); 41 dxp = &vq->vq_descx[desc_idx]; 42 dxp->cookie = (void *)cookie; 43 vq->sw_ring[desc_idx] = cookie; 44 45 start_dp = vq->vq_ring.desc; 46 start_dp[desc_idx].addr = 47 VIRTIO_MBUF_ADDR(cookie, vq) + 48 RTE_PKTMBUF_HEADROOM - vq->hw->vtnet_hdr_size; 49 start_dp[desc_idx].len = cookie->buf_len - 50 RTE_PKTMBUF_HEADROOM + vq->hw->vtnet_hdr_size; 51 52 vq->vq_free_cnt--; 53 vq->vq_avail_idx++; 54 55 return 0; 56 } 57 58 uint16_t 59 virtio_xmit_pkts_simple(void *tx_queue, struct rte_mbuf **tx_pkts, 60 uint16_t nb_pkts) 61 { 62 struct virtnet_tx *txvq = tx_queue; 63 struct virtqueue *vq = txvq->vq; 64 struct virtio_hw *hw = vq->hw; 65 uint16_t nb_used; 66 uint16_t desc_idx; 67 struct vring_desc *start_dp; 68 uint16_t nb_tail, nb_commit; 69 int i; 70 uint16_t desc_idx_max = (vq->vq_nentries >> 1) - 1; 71 uint16_t nb_tx = 0; 72 73 if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts)) 74 return nb_tx; 75 76 nb_used = VIRTQUEUE_NUSED(vq); 77 rte_compiler_barrier(); 78 79 if (nb_used >= VIRTIO_TX_FREE_THRESH) 80 virtio_xmit_cleanup(vq); 81 82 nb_commit = nb_pkts = RTE_MIN((vq->vq_free_cnt >> 1), nb_pkts); 83 desc_idx = (uint16_t)(vq->vq_avail_idx & desc_idx_max); 84 start_dp = vq->vq_ring.desc; 85 nb_tail = (uint16_t) (desc_idx_max + 1 - desc_idx); 86 87 if (nb_commit >= nb_tail) { 88 for (i = 0; i < nb_tail; i++) 89 vq->vq_descx[desc_idx + i].cookie = tx_pkts[i]; 90 for (i = 0; i < nb_tail; i++) { 91 start_dp[desc_idx].addr = 92 VIRTIO_MBUF_DATA_DMA_ADDR(*tx_pkts, vq); 93 start_dp[desc_idx].len = (*tx_pkts)->pkt_len; 94 tx_pkts++; 95 desc_idx++; 96 } 97 nb_commit -= nb_tail; 98 desc_idx = 0; 99 } 100 for (i = 0; i < nb_commit; i++) 101 vq->vq_descx[desc_idx + i].cookie = tx_pkts[i]; 102 for (i = 0; i < nb_commit; i++) { 103 start_dp[desc_idx].addr = 104 VIRTIO_MBUF_DATA_DMA_ADDR(*tx_pkts, vq); 105 start_dp[desc_idx].len = (*tx_pkts)->pkt_len; 106 tx_pkts++; 107 desc_idx++; 108 } 109 110 rte_compiler_barrier(); 111 112 vq->vq_free_cnt -= (uint16_t)(nb_pkts << 1); 113 vq->vq_avail_idx += nb_pkts; 114 vq->vq_ring.avail->idx = vq->vq_avail_idx; 115 txvq->stats.packets += nb_pkts; 116 117 if (likely(nb_pkts)) { 118 if (unlikely(virtqueue_kick_prepare(vq))) 119 virtqueue_notify(vq); 120 } 121 122 return nb_pkts; 123 } 124 125 int __attribute__((cold)) 126 virtio_rxq_vec_setup(struct virtnet_rx *rxq) 127 { 128 uintptr_t p; 129 struct rte_mbuf mb_def = { .buf_addr = 0 }; /* zeroed mbuf */ 130 131 mb_def.nb_segs = 1; 132 mb_def.data_off = RTE_PKTMBUF_HEADROOM; 133 mb_def.port = rxq->port_id; 134 rte_mbuf_refcnt_set(&mb_def, 1); 135 136 /* prevent compiler reordering: rearm_data covers previous fields */ 137 rte_compiler_barrier(); 138 p = (uintptr_t)&mb_def.rearm_data; 139 rxq->mbuf_initializer = *(uint64_t *)p; 140 141 return 0; 142 } 143 144 /* Stub for linkage when arch specific implementation is not available */ 145 uint16_t __attribute__((weak)) 146 virtio_recv_pkts_vec(void *rx_queue __rte_unused, 147 struct rte_mbuf **rx_pkts __rte_unused, 148 uint16_t nb_pkts __rte_unused) 149 { 150 rte_panic("Wrong weak function linked by linker\n"); 151 return 0; 152 } 153