1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2015 Intel Corporation
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>
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>
24 #include "virtio_rxtx_simple.h"
26 #ifndef __INTEL_COMPILER
27 #pragma GCC diagnostic ignored "-Wcast-qual"
31 virtio_xmit_pkts_simple(void *tx_queue, struct rte_mbuf **tx_pkts,
34 struct virtnet_tx *txvq = tx_queue;
35 struct virtqueue *vq = txvq->vq;
36 struct virtio_hw *hw = vq->hw;
39 struct vring_desc *start_dp;
40 uint16_t nb_tail, nb_commit;
42 uint16_t desc_idx_max = (vq->vq_nentries >> 1) - 1;
45 if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
48 nb_used = VIRTQUEUE_NUSED(vq);
49 rte_compiler_barrier();
51 if (nb_used >= VIRTIO_TX_FREE_THRESH)
52 virtio_xmit_cleanup_simple(vq);
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);
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;
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;
82 rte_compiler_barrier();
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;
89 if (likely(nb_pkts)) {
90 if (unlikely(virtqueue_kick_prepare(vq)))
97 int __attribute__((cold))
98 virtio_rxq_vec_setup(struct virtnet_rx *rxq)
101 struct rte_mbuf mb_def = { .buf_addr = 0 }; /* zeroed mbuf */
104 mb_def.data_off = RTE_PKTMBUF_HEADROOM;
105 mb_def.port = rxq->port_id;
106 rte_mbuf_refcnt_set(&mb_def, 1);
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;
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)
122 rte_panic("Wrong weak function linked by linker\n");