ea5207c158
In case VIRTIO_F_ORDER_PLATFORM(36) is not negotiated, then the frontend and backend are assumed to be implemented in software, that is they can run on identical CPUs in an SMP configuration. Thus a weak form of memory barriers like rte_smp_r/wmb, other than rte_cio_r/wmb, is sufficient for this case(vq->hw->weak_barriers == 1) and yields better performance. For the above case, this patch helps yielding even better performance by replacing the two-way barriers with C11 one-way barriers for used index in split ring. Signed-off-by: Joyce Kong <joyce.kong@arm.com> Reviewed-by: Gavin Hu <gavin.hu@arm.com> Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
216 lines
5.0 KiB
C
216 lines
5.0 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
|
|
* Copyright(c) 2010-2015 Intel Corporation
|
|
*/
|
|
#include <stdint.h>
|
|
|
|
#include <rte_mbuf.h>
|
|
|
|
#include "virtqueue.h"
|
|
#include "virtio_logs.h"
|
|
#include "virtio_pci.h"
|
|
#include "virtio_rxtx_simple.h"
|
|
|
|
/*
|
|
* Two types of mbuf to be cleaned:
|
|
* 1) mbuf that has been consumed by backend but not used by virtio.
|
|
* 2) mbuf that hasn't been consued by backend.
|
|
*/
|
|
struct rte_mbuf *
|
|
virtqueue_detach_unused(struct virtqueue *vq)
|
|
{
|
|
struct rte_mbuf *cookie;
|
|
struct virtio_hw *hw;
|
|
uint16_t start, end;
|
|
int type, idx;
|
|
|
|
if (vq == NULL)
|
|
return NULL;
|
|
|
|
hw = vq->hw;
|
|
type = virtio_get_queue_type(hw, vq->vq_queue_index);
|
|
start = vq->vq_avail_idx & (vq->vq_nentries - 1);
|
|
end = (vq->vq_avail_idx + vq->vq_free_cnt) & (vq->vq_nentries - 1);
|
|
|
|
for (idx = 0; idx < vq->vq_nentries; idx++) {
|
|
if (hw->use_vec_rx && !vtpci_packed_queue(hw) &&
|
|
type == VTNET_RQ) {
|
|
if (start <= end && idx >= start && idx < end)
|
|
continue;
|
|
if (start > end && (idx >= start || idx < end))
|
|
continue;
|
|
cookie = vq->sw_ring[idx];
|
|
if (cookie != NULL) {
|
|
vq->sw_ring[idx] = NULL;
|
|
return cookie;
|
|
}
|
|
} else {
|
|
cookie = vq->vq_descx[idx].cookie;
|
|
if (cookie != NULL) {
|
|
vq->vq_descx[idx].cookie = NULL;
|
|
return cookie;
|
|
}
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* Flush used descs */
|
|
static void
|
|
virtqueue_rxvq_flush_packed(struct virtqueue *vq)
|
|
{
|
|
struct vq_desc_extra *dxp;
|
|
uint16_t i;
|
|
|
|
struct vring_packed_desc *descs = vq->vq_packed.ring.desc;
|
|
int cnt = 0;
|
|
|
|
i = vq->vq_used_cons_idx;
|
|
while (desc_is_used(&descs[i], vq) && cnt++ < vq->vq_nentries) {
|
|
dxp = &vq->vq_descx[descs[i].id];
|
|
if (dxp->cookie != NULL) {
|
|
rte_pktmbuf_free(dxp->cookie);
|
|
dxp->cookie = NULL;
|
|
}
|
|
vq->vq_free_cnt++;
|
|
vq->vq_used_cons_idx++;
|
|
if (vq->vq_used_cons_idx >= vq->vq_nentries) {
|
|
vq->vq_used_cons_idx -= vq->vq_nentries;
|
|
vq->vq_packed.used_wrap_counter ^= 1;
|
|
}
|
|
i = vq->vq_used_cons_idx;
|
|
}
|
|
}
|
|
|
|
/* Flush the elements in the used ring. */
|
|
static void
|
|
virtqueue_rxvq_flush_split(struct virtqueue *vq)
|
|
{
|
|
struct virtnet_rx *rxq = &vq->rxq;
|
|
struct virtio_hw *hw = vq->hw;
|
|
struct vring_used_elem *uep;
|
|
struct vq_desc_extra *dxp;
|
|
uint16_t used_idx, desc_idx;
|
|
uint16_t nb_used, i;
|
|
|
|
nb_used = virtqueue_nused(vq);
|
|
|
|
for (i = 0; i < nb_used; i++) {
|
|
used_idx = vq->vq_used_cons_idx & (vq->vq_nentries - 1);
|
|
uep = &vq->vq_split.ring.used->ring[used_idx];
|
|
if (hw->use_vec_rx) {
|
|
desc_idx = used_idx;
|
|
rte_pktmbuf_free(vq->sw_ring[desc_idx]);
|
|
vq->vq_free_cnt++;
|
|
} else if (hw->use_inorder_rx) {
|
|
desc_idx = (uint16_t)uep->id;
|
|
dxp = &vq->vq_descx[desc_idx];
|
|
if (dxp->cookie != NULL) {
|
|
rte_pktmbuf_free(dxp->cookie);
|
|
dxp->cookie = NULL;
|
|
}
|
|
vq_ring_free_inorder(vq, desc_idx, 1);
|
|
} else {
|
|
desc_idx = (uint16_t)uep->id;
|
|
dxp = &vq->vq_descx[desc_idx];
|
|
if (dxp->cookie != NULL) {
|
|
rte_pktmbuf_free(dxp->cookie);
|
|
dxp->cookie = NULL;
|
|
}
|
|
vq_ring_free_chain(vq, desc_idx);
|
|
}
|
|
vq->vq_used_cons_idx++;
|
|
}
|
|
|
|
if (hw->use_vec_rx) {
|
|
while (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) {
|
|
virtio_rxq_rearm_vec(rxq);
|
|
if (virtqueue_kick_prepare(vq))
|
|
virtqueue_notify(vq);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Flush the elements in the used ring. */
|
|
void
|
|
virtqueue_rxvq_flush(struct virtqueue *vq)
|
|
{
|
|
struct virtio_hw *hw = vq->hw;
|
|
|
|
if (vtpci_packed_queue(hw))
|
|
virtqueue_rxvq_flush_packed(vq);
|
|
else
|
|
virtqueue_rxvq_flush_split(vq);
|
|
}
|
|
|
|
int
|
|
virtqueue_rxvq_reset_packed(struct virtqueue *vq)
|
|
{
|
|
int size = vq->vq_nentries;
|
|
struct vq_desc_extra *dxp;
|
|
struct virtnet_rx *rxvq;
|
|
uint16_t desc_idx;
|
|
|
|
vq->vq_used_cons_idx = 0;
|
|
vq->vq_desc_head_idx = 0;
|
|
vq->vq_avail_idx = 0;
|
|
vq->vq_desc_tail_idx = (uint16_t)(vq->vq_nentries - 1);
|
|
vq->vq_free_cnt = vq->vq_nentries;
|
|
|
|
vq->vq_packed.used_wrap_counter = 1;
|
|
vq->vq_packed.cached_flags = VRING_PACKED_DESC_F_AVAIL;
|
|
vq->vq_packed.event_flags_shadow = 0;
|
|
vq->vq_packed.cached_flags |= VRING_DESC_F_WRITE;
|
|
|
|
rxvq = &vq->rxq;
|
|
memset(rxvq->mz->addr, 0, rxvq->mz->len);
|
|
|
|
for (desc_idx = 0; desc_idx < vq->vq_nentries; desc_idx++) {
|
|
dxp = &vq->vq_descx[desc_idx];
|
|
if (dxp->cookie != NULL) {
|
|
rte_pktmbuf_free(dxp->cookie);
|
|
dxp->cookie = NULL;
|
|
}
|
|
}
|
|
|
|
vring_desc_init_packed(vq, size);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
virtqueue_txvq_reset_packed(struct virtqueue *vq)
|
|
{
|
|
int size = vq->vq_nentries;
|
|
struct vq_desc_extra *dxp;
|
|
struct virtnet_tx *txvq;
|
|
uint16_t desc_idx;
|
|
|
|
vq->vq_used_cons_idx = 0;
|
|
vq->vq_desc_head_idx = 0;
|
|
vq->vq_avail_idx = 0;
|
|
vq->vq_desc_tail_idx = (uint16_t)(vq->vq_nentries - 1);
|
|
vq->vq_free_cnt = vq->vq_nentries;
|
|
|
|
vq->vq_packed.used_wrap_counter = 1;
|
|
vq->vq_packed.cached_flags = VRING_PACKED_DESC_F_AVAIL;
|
|
vq->vq_packed.event_flags_shadow = 0;
|
|
|
|
txvq = &vq->txq;
|
|
memset(txvq->mz->addr, 0, txvq->mz->len);
|
|
memset(txvq->virtio_net_hdr_mz->addr, 0,
|
|
txvq->virtio_net_hdr_mz->len);
|
|
|
|
for (desc_idx = 0; desc_idx < vq->vq_nentries; desc_idx++) {
|
|
dxp = &vq->vq_descx[desc_idx];
|
|
if (dxp->cookie != NULL) {
|
|
rte_pktmbuf_free(dxp->cookie);
|
|
dxp->cookie = NULL;
|
|
}
|
|
}
|
|
|
|
vring_desc_init_packed(vq, size);
|
|
|
|
return 0;
|
|
}
|