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.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"
30 int __attribute__((cold))
31 virtqueue_enqueue_recv_refill_simple(struct virtqueue *vq,
32 struct rte_mbuf *cookie)
34 struct vq_desc_extra *dxp;
35 struct vring_desc *start_dp;
38 cookie->port = vq->rxq.port_id;
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;
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;
59 virtio_xmit_pkts_simple(void *tx_queue, struct rte_mbuf **tx_pkts,
62 struct virtnet_tx *txvq = tx_queue;
63 struct virtqueue *vq = txvq->vq;
64 struct virtio_hw *hw = vq->hw;
67 struct vring_desc *start_dp;
68 uint16_t nb_tail, nb_commit;
70 uint16_t desc_idx_max = (vq->vq_nentries >> 1) - 1;
73 if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
76 nb_used = VIRTQUEUE_NUSED(vq);
77 rte_compiler_barrier();
79 if (nb_used >= VIRTIO_TX_FREE_THRESH)
80 virtio_xmit_cleanup(vq);
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);
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;
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;
110 rte_compiler_barrier();
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;
117 if (likely(nb_pkts)) {
118 if (unlikely(virtqueue_kick_prepare(vq)))
119 virtqueue_notify(vq);
125 int __attribute__((cold))
126 virtio_rxq_vec_setup(struct virtnet_rx *rxq)
129 struct rte_mbuf mb_def = { .buf_addr = 0 }; /* zeroed mbuf */
132 mb_def.data_off = RTE_PKTMBUF_HEADROOM;
133 mb_def.port = rxq->port_id;
134 rte_mbuf_refcnt_set(&mb_def, 1);
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;
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)
150 rte_panic("Wrong weak function linked by linker\n");