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/*-
* BSD LICENSE
*
* Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <rte_cycles.h>
#include <rte_memory.h>
#include <rte_memzone.h>
#include <rte_branch_prediction.h>
#include <rte_mempool.h>
#include <rte_malloc.h>
#include <rte_mbuf.h>
#include <rte_ether.h>
#include <rte_ethdev.h>
#include <rte_prefetch.h>
#include <rte_string_fns.h>
#include <rte_errno.h>
#include <rte_byteorder.h>
#include "virtio_rxtx_simple.h"
#ifndef __INTEL_COMPILER
#pragma GCC diagnostic ignored "-Wcast-qual"
#endif
uint16_t
virtio_xmit_pkts_simple(void *tx_queue, struct rte_mbuf **tx_pkts,
uint16_t nb_pkts)
{
struct virtnet_tx *txvq = tx_queue;
struct virtqueue *vq = txvq->vq;
uint16_t nb_used;
uint16_t desc_idx;
struct vring_desc *start_dp;
uint16_t nb_tail, nb_commit;
int i;
uint16_t desc_idx_max = (vq->vq_nentries >> 1) - 1;
nb_used = VIRTQUEUE_NUSED(vq);
rte_compiler_barrier();
if (nb_used >= VIRTIO_TX_FREE_THRESH)
virtio_xmit_cleanup_simple(vq);
nb_commit = nb_pkts = RTE_MIN((vq->vq_free_cnt >> 1), nb_pkts);
desc_idx = (uint16_t)(vq->vq_avail_idx & desc_idx_max);
start_dp = vq->vq_ring.desc;
nb_tail = (uint16_t) (desc_idx_max + 1 - desc_idx);
if (nb_commit >= nb_tail) {
for (i = 0; i < nb_tail; i++)
vq->vq_descx[desc_idx + i].cookie = tx_pkts[i];
for (i = 0; i < nb_tail; i++) {
start_dp[desc_idx].addr =
VIRTIO_MBUF_DATA_DMA_ADDR(*tx_pkts, vq);
start_dp[desc_idx].len = (*tx_pkts)->pkt_len;
tx_pkts++;
desc_idx++;
}
nb_commit -= nb_tail;
desc_idx = 0;
}
for (i = 0; i < nb_commit; i++)
vq->vq_descx[desc_idx + i].cookie = tx_pkts[i];
for (i = 0; i < nb_commit; i++) {
start_dp[desc_idx].addr =
VIRTIO_MBUF_DATA_DMA_ADDR(*tx_pkts, vq);
start_dp[desc_idx].len = (*tx_pkts)->pkt_len;
tx_pkts++;
desc_idx++;
}
rte_compiler_barrier();
vq->vq_free_cnt -= (uint16_t)(nb_pkts << 1);
vq->vq_avail_idx += nb_pkts;
vq->vq_ring.avail->idx = vq->vq_avail_idx;
txvq->stats.packets += nb_pkts;
if (likely(nb_pkts)) {
if (unlikely(virtqueue_kick_prepare(vq)))
virtqueue_notify(vq);
}
return nb_pkts;
}
int __attribute__((cold))
virtio_rxq_vec_setup(struct virtnet_rx *rxq)
{
uintptr_t p;
struct rte_mbuf mb_def = { .buf_addr = 0 }; /* zeroed mbuf */
mb_def.nb_segs = 1;
mb_def.data_off = RTE_PKTMBUF_HEADROOM;
mb_def.port = rxq->port_id;
rte_mbuf_refcnt_set(&mb_def, 1);
/* prevent compiler reordering: rearm_data covers previous fields */
rte_compiler_barrier();
p = (uintptr_t)&mb_def.rearm_data;
rxq->mbuf_initializer = *(uint64_t *)p;
return 0;
}
/* Stub for linkage when arch specific implementation is not available */
uint16_t __attribute__((weak))
virtio_recv_pkts_vec(void *rx_queue __rte_unused,
struct rte_mbuf **rx_pkts __rte_unused,
uint16_t nb_pkts __rte_unused)
{
rte_panic("Wrong weak function linked by linker\n");
return 0;
}
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