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40 #include <rte_cycles.h>
41 #include <rte_memory.h>
42 #include <rte_memzone.h>
43 #include <rte_branch_prediction.h>
44 #include <rte_mempool.h>
45 #include <rte_malloc.h>
47 #include <rte_ether.h>
48 #include <rte_ethdev.h>
49 #include <rte_prefetch.h>
50 #include <rte_string_fns.h>
51 #include <rte_errno.h>
52 #include <rte_byteorder.h>
54 #include "virtio_rxtx_simple.h"
56 #ifndef __INTEL_COMPILER
57 #pragma GCC diagnostic ignored "-Wcast-qual"
60 int __attribute__((cold))
61 virtqueue_enqueue_recv_refill_simple(struct virtqueue *vq,
62 struct rte_mbuf *cookie)
64 struct vq_desc_extra *dxp;
65 struct vring_desc *start_dp;
68 cookie->port = vq->rxq.port_id;
70 desc_idx = vq->vq_avail_idx & (vq->vq_nentries - 1);
71 dxp = &vq->vq_descx[desc_idx];
72 dxp->cookie = (void *)cookie;
73 vq->sw_ring[desc_idx] = cookie;
75 start_dp = vq->vq_ring.desc;
76 start_dp[desc_idx].addr =
77 VIRTIO_MBUF_ADDR(cookie, vq) +
78 RTE_PKTMBUF_HEADROOM - vq->hw->vtnet_hdr_size;
79 start_dp[desc_idx].len = cookie->buf_len -
80 RTE_PKTMBUF_HEADROOM + vq->hw->vtnet_hdr_size;
89 virtio_xmit_pkts_simple(void *tx_queue, struct rte_mbuf **tx_pkts,
92 struct virtnet_tx *txvq = tx_queue;
93 struct virtqueue *vq = txvq->vq;
96 struct vring_desc *start_dp;
97 uint16_t nb_tail, nb_commit;
99 uint16_t desc_idx_max = (vq->vq_nentries >> 1) - 1;
101 nb_used = VIRTQUEUE_NUSED(vq);
102 rte_compiler_barrier();
104 if (nb_used >= VIRTIO_TX_FREE_THRESH)
105 virtio_xmit_cleanup(vq);
107 nb_commit = nb_pkts = RTE_MIN((vq->vq_free_cnt >> 1), nb_pkts);
108 desc_idx = (uint16_t)(vq->vq_avail_idx & desc_idx_max);
109 start_dp = vq->vq_ring.desc;
110 nb_tail = (uint16_t) (desc_idx_max + 1 - desc_idx);
112 if (nb_commit >= nb_tail) {
113 for (i = 0; i < nb_tail; i++)
114 vq->vq_descx[desc_idx + i].cookie = tx_pkts[i];
115 for (i = 0; i < nb_tail; i++) {
116 start_dp[desc_idx].addr =
117 VIRTIO_MBUF_DATA_DMA_ADDR(*tx_pkts, vq);
118 start_dp[desc_idx].len = (*tx_pkts)->pkt_len;
122 nb_commit -= nb_tail;
125 for (i = 0; i < nb_commit; i++)
126 vq->vq_descx[desc_idx + i].cookie = tx_pkts[i];
127 for (i = 0; i < nb_commit; i++) {
128 start_dp[desc_idx].addr =
129 VIRTIO_MBUF_DATA_DMA_ADDR(*tx_pkts, vq);
130 start_dp[desc_idx].len = (*tx_pkts)->pkt_len;
135 rte_compiler_barrier();
137 vq->vq_free_cnt -= (uint16_t)(nb_pkts << 1);
138 vq->vq_avail_idx += nb_pkts;
139 vq->vq_ring.avail->idx = vq->vq_avail_idx;
140 txvq->stats.packets += nb_pkts;
142 if (likely(nb_pkts)) {
143 if (unlikely(virtqueue_kick_prepare(vq)))
144 virtqueue_notify(vq);
150 int __attribute__((cold))
151 virtio_rxq_vec_setup(struct virtnet_rx *rxq)
154 struct rte_mbuf mb_def = { .buf_addr = 0 }; /* zeroed mbuf */
157 mb_def.data_off = RTE_PKTMBUF_HEADROOM;
158 mb_def.port = rxq->port_id;
159 rte_mbuf_refcnt_set(&mb_def, 1);
161 /* prevent compiler reordering: rearm_data covers previous fields */
162 rte_compiler_barrier();
163 p = (uintptr_t)&mb_def.rearm_data;
164 rxq->mbuf_initializer = *(uint64_t *)p;
169 /* Stub for linkage when arch specific implementation is not available */
170 uint16_t __attribute__((weak))
171 virtio_recv_pkts_vec(void *rx_queue __rte_unused,
172 struct rte_mbuf **rx_pkts __rte_unused,
173 uint16_t nb_pkts __rte_unused)
175 rte_panic("Wrong weak function linked by linker\n");