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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2018 Intel Corporation
*/
/**
* @file
*
* Device specific vhost lib
*/
#include <stdbool.h>
#include <rte_malloc.h>
#include "rte_vdpa.h"
#include "vhost.h"
static struct rte_vdpa_device *vdpa_devices[MAX_VHOST_DEVICE];
static uint32_t vdpa_device_num;
static bool
is_same_vdpa_device(struct rte_vdpa_dev_addr *a,
struct rte_vdpa_dev_addr *b)
{
bool ret = true;
if (a->type != b->type)
return false;
switch (a->type) {
case PCI_ADDR:
if (a->pci_addr.domain != b->pci_addr.domain ||
a->pci_addr.bus != b->pci_addr.bus ||
a->pci_addr.devid != b->pci_addr.devid ||
a->pci_addr.function != b->pci_addr.function)
ret = false;
break;
default:
break;
}
return ret;
}
int
rte_vdpa_register_device(struct rte_vdpa_dev_addr *addr,
struct rte_vdpa_dev_ops *ops)
{
struct rte_vdpa_device *dev;
char device_name[MAX_VDPA_NAME_LEN];
int i;
if (vdpa_device_num >= MAX_VHOST_DEVICE || addr == NULL || ops == NULL)
return -1;
for (i = 0; i < MAX_VHOST_DEVICE; i++) {
dev = vdpa_devices[i];
if (dev && is_same_vdpa_device(&dev->addr, addr))
return -1;
}
for (i = 0; i < MAX_VHOST_DEVICE; i++) {
if (vdpa_devices[i] == NULL)
break;
}
if (i == MAX_VHOST_DEVICE)
return -1;
snprintf(device_name, sizeof(device_name), "vdpa-dev-%d", i);
dev = rte_zmalloc(device_name, sizeof(struct rte_vdpa_device),
RTE_CACHE_LINE_SIZE);
if (!dev)
return -1;
memcpy(&dev->addr, addr, sizeof(struct rte_vdpa_dev_addr));
dev->ops = ops;
vdpa_devices[i] = dev;
vdpa_device_num++;
return i;
}
int
rte_vdpa_unregister_device(int did)
{
if (did < 0 || did >= MAX_VHOST_DEVICE || vdpa_devices[did] == NULL)
return -1;
rte_free(vdpa_devices[did]);
vdpa_devices[did] = NULL;
vdpa_device_num--;
return did;
}
int
rte_vdpa_find_device_id(struct rte_vdpa_dev_addr *addr)
{
struct rte_vdpa_device *dev;
int i;
if (addr == NULL)
return -1;
for (i = 0; i < MAX_VHOST_DEVICE; ++i) {
dev = vdpa_devices[i];
if (dev && is_same_vdpa_device(&dev->addr, addr))
return i;
}
return -1;
}
struct rte_vdpa_device *
rte_vdpa_get_device(int did)
{
if (did < 0 || did >= MAX_VHOST_DEVICE)
return NULL;
return vdpa_devices[did];
}
int
rte_vdpa_get_device_num(void)
{
return vdpa_device_num;
}
int __rte_experimental
rte_vdpa_relay_vring_used(int vid, uint16_t qid, void *vring_m)
{
struct virtio_net *dev = get_device(vid);
uint16_t idx, idx_m, desc_id;
struct vhost_virtqueue *vq;
struct vring_desc desc;
struct vring_desc *desc_ring;
struct vring_desc *idesc = NULL;
struct vring *s_vring;
uint64_t dlen;
uint32_t nr_descs;
int ret;
if (!dev || !vring_m)
return -1;
if (qid >= dev->nr_vring)
return -1;
if (vq_is_packed(dev))
return -1;
s_vring = (struct vring *)vring_m;
vq = dev->virtqueue[qid];
idx = vq->used->idx;
idx_m = s_vring->used->idx;
ret = (uint16_t)(idx_m - idx);
while (idx != idx_m) {
/* copy used entry, used ring logging is not covered here */
vq->used->ring[idx & (vq->size - 1)] =
s_vring->used->ring[idx & (vq->size - 1)];
desc_id = vq->used->ring[idx & (vq->size - 1)].id;
desc_ring = vq->desc;
nr_descs = vq->size;
if (unlikely(desc_id >= vq->size))
return -1;
if (vq->desc[desc_id].flags & VRING_DESC_F_INDIRECT) {
dlen = vq->desc[desc_id].len;
nr_descs = dlen / sizeof(struct vring_desc);
if (unlikely(nr_descs > vq->size))
return -1;
desc_ring = (struct vring_desc *)(uintptr_t)
vhost_iova_to_vva(dev, vq,
vq->desc[desc_id].addr, &dlen,
VHOST_ACCESS_RO);
if (unlikely(!desc_ring))
return -1;
if (unlikely(dlen < vq->desc[desc_id].len)) {
idesc = alloc_copy_ind_table(dev, vq,
vq->desc[desc_id].addr,
vq->desc[desc_id].len);
if (unlikely(!idesc))
return -1;
desc_ring = idesc;
}
desc_id = 0;
}
/* dirty page logging for DMA writeable buffer */
do {
if (unlikely(desc_id >= vq->size))
goto fail;
if (unlikely(nr_descs-- == 0))
goto fail;
desc = desc_ring[desc_id];
if (desc.flags & VRING_DESC_F_WRITE)
vhost_log_write(dev, desc.addr, desc.len);
desc_id = desc.next;
} while (desc.flags & VRING_DESC_F_NEXT);
if (unlikely(idesc)) {
free_ind_table(idesc);
idesc = NULL;
}
idx++;
}
rte_smp_wmb();
vq->used->idx = idx_m;
if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
vring_used_event(s_vring) = idx_m;
return ret;
fail:
if (unlikely(idesc))
free_ind_table(idesc);
return -1;
}
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