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 uint16_t 31 virtio_xmit_pkts_simple(void *tx_queue, struct rte_mbuf **tx_pkts, 32 uint16_t nb_pkts) 33 { 34 struct virtnet_tx *txvq = tx_queue; 35 struct virtqueue *vq = txvq->vq; 36 struct virtio_hw *hw = vq->hw; 37 uint16_t nb_used; 38 uint16_t desc_idx; 39 struct vring_desc *start_dp; 40 uint16_t nb_tail, nb_commit; 41 int i; 42 uint16_t desc_idx_max = (vq->vq_nentries >> 1) - 1; 43 uint16_t nb_tx = 0; 44 45 if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts)) 46 return nb_tx; 47 48 nb_used = VIRTQUEUE_NUSED(vq); 49 rte_compiler_barrier(); 50 51 if (nb_used >= VIRTIO_TX_FREE_THRESH) 52 virtio_xmit_cleanup_simple(vq); 53 54 nb_commit = nb_pkts = RTE_MIN((vq->vq_free_cnt >> 1), nb_pkts); 55 desc_idx = (uint16_t)(vq->vq_avail_idx & desc_idx_max); 56 start_dp = vq->vq_ring.desc; 57 nb_tail = (uint16_t) (desc_idx_max + 1 - desc_idx); 58 59 if (nb_commit >= nb_tail) { 60 for (i = 0; i < nb_tail; i++) 61 vq->vq_descx[desc_idx + i].cookie = tx_pkts[i]; 62 for (i = 0; i < nb_tail; i++) { 63 start_dp[desc_idx].addr = 64 VIRTIO_MBUF_DATA_DMA_ADDR(*tx_pkts, vq); 65 start_dp[desc_idx].len = (*tx_pkts)->pkt_len; 66 tx_pkts++; 67 desc_idx++; 68 } 69 nb_commit -= nb_tail; 70 desc_idx = 0; 71 } 72 for (i = 0; i < nb_commit; i++) 73 vq->vq_descx[desc_idx + i].cookie = tx_pkts[i]; 74 for (i = 0; i < nb_commit; i++) { 75 start_dp[desc_idx].addr = 76 VIRTIO_MBUF_DATA_DMA_ADDR(*tx_pkts, vq); 77 start_dp[desc_idx].len = (*tx_pkts)->pkt_len; 78 tx_pkts++; 79 desc_idx++; 80 } 81 82 rte_compiler_barrier(); 83 84 vq->vq_free_cnt -= (uint16_t)(nb_pkts << 1); 85 vq->vq_avail_idx += nb_pkts; 86 vq->vq_ring.avail->idx = vq->vq_avail_idx; 87 txvq->stats.packets += nb_pkts; 88 89 if (likely(nb_pkts)) { 90 if (unlikely(virtqueue_kick_prepare(vq))) 91 virtqueue_notify(vq); 92 } 93 94 return nb_pkts; 95 } 96 97 int __attribute__((cold)) 98 virtio_rxq_vec_setup(struct virtnet_rx *rxq) 99 { 100 uintptr_t p; 101 struct rte_mbuf mb_def = { .buf_addr = 0 }; /* zeroed mbuf */ 102 103 mb_def.nb_segs = 1; 104 mb_def.data_off = RTE_PKTMBUF_HEADROOM; 105 mb_def.port = rxq->port_id; 106 rte_mbuf_refcnt_set(&mb_def, 1); 107 108 /* prevent compiler reordering: rearm_data covers previous fields */ 109 rte_compiler_barrier(); 110 p = (uintptr_t)&mb_def.rearm_data; 111 rxq->mbuf_initializer = *(uint64_t *)p; 112 113 return 0; 114 } 115 116 /* Stub for linkage when arch specific implementation is not available */ 117 uint16_t __attribute__((weak)) 118 virtio_recv_pkts_vec(void *rx_queue __rte_unused, 119 struct rte_mbuf **rx_pkts __rte_unused, 120 uint16_t nb_pkts __rte_unused) 121 { 122 rte_panic("Wrong weak function linked by linker\n"); 123 return 0; 124 } 125