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vdpa: Move command buffers map to start of net device 

As this series will reuse them to restore the device state at the end of
a migration (or a device start), let's allocate only once at the device
start so we don't duplicate their map and unmap.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Eugenio Pérez 2022-08-23 20:30:33 +02:00 committed by Jason Wang
parent f8972b56ee
commit 7a7f87e94c
1 changed files with 58 additions and 65 deletions
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123
net/vhost-vdpa.c
View File

@ -263,29 +263,20 @@ static size_t vhost_vdpa_net_cvq_cmd_page_len(void)
return ROUND_UP(vhost_vdpa_net_cvq_cmd_len(), qemu_real_host_page_size()); return ROUND_UP(vhost_vdpa_net_cvq_cmd_len(), qemu_real_host_page_size());
} }
/** Copy and map a guest buffer. */ /** Map CVQ buffer. */
static bool vhost_vdpa_cvq_map_buf(struct vhost_vdpa *v, static int vhost_vdpa_cvq_map_buf(struct vhost_vdpa *v, void *buf, size_t size,
const struct iovec *out_data, bool write)
size_t out_num, size_t data_len, void *buf,
size_t *written, bool write)
{ {
DMAMap map = {}; DMAMap map = {};
int r; int r;
if (unlikely(!data_len)) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid legnth of %s buffer\n",
__func__, write ? "in" : "out");
return false;
}
*written = iov_to_buf(out_data, out_num, 0, buf, data_len);
map.translated_addr = (hwaddr)(uintptr_t)buf; map.translated_addr = (hwaddr)(uintptr_t)buf;
map.size = vhost_vdpa_net_cvq_cmd_page_len() - 1; map.size = size - 1;
map.perm = write ? IOMMU_RW : IOMMU_RO, map.perm = write ? IOMMU_RW : IOMMU_RO,
r = vhost_iova_tree_map_alloc(v->iova_tree, &map); r = vhost_iova_tree_map_alloc(v->iova_tree, &map);
if (unlikely(r != IOVA_OK)) { if (unlikely(r != IOVA_OK)) {
error_report("Cannot map injected element"); error_report("Cannot map injected element");
return false; return r;
} }
r = vhost_vdpa_dma_map(v, map.iova, vhost_vdpa_net_cvq_cmd_page_len(), buf, r = vhost_vdpa_dma_map(v, map.iova, vhost_vdpa_net_cvq_cmd_page_len(), buf,
@ -294,50 +285,58 @@ static bool vhost_vdpa_cvq_map_buf(struct vhost_vdpa *v,
goto dma_map_err; goto dma_map_err;
} }
return true; return 0;
dma_map_err: dma_map_err:
vhost_iova_tree_remove(v->iova_tree, map); vhost_iova_tree_remove(v->iova_tree, map);
return false; return r;
} }
/** static int vhost_vdpa_net_cvq_start(NetClientState *nc)
* Copy the guest element into a dedicated buffer suitable to be sent to NIC
*
* @iov: [0] is the out buffer, [1] is the in one
*/
static bool vhost_vdpa_net_cvq_map_elem(VhostVDPAState *s,
VirtQueueElement *elem,
struct iovec *iov)
{ {
size_t in_copied; VhostVDPAState *s;
bool ok; int r;
iov[0].iov_base = s->cvq_cmd_out_buffer; assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
ok = vhost_vdpa_cvq_map_buf(&s->vhost_vdpa, elem->out_sg, elem->out_num,
vhost_vdpa_net_cvq_cmd_len(), iov[0].iov_base, s = DO_UPCAST(VhostVDPAState, nc, nc);
&iov[0].iov_len, false); if (!s->vhost_vdpa.shadow_vqs_enabled) {
if (unlikely(!ok)) { return 0;
return false;
} }
iov[1].iov_base = s->cvq_cmd_in_buffer; r = vhost_vdpa_cvq_map_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer,
ok = vhost_vdpa_cvq_map_buf(&s->vhost_vdpa, NULL, 0, vhost_vdpa_net_cvq_cmd_page_len(), false);
sizeof(virtio_net_ctrl_ack), iov[1].iov_base, if (unlikely(r < 0)) {
&in_copied, true); return r;
if (unlikely(!ok)) { }
r = vhost_vdpa_cvq_map_buf(&s->vhost_vdpa, s->cvq_cmd_in_buffer,
vhost_vdpa_net_cvq_cmd_page_len(), true);
if (unlikely(r < 0)) {
vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer); vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer);
return false;
} }
iov[1].iov_len = sizeof(virtio_net_ctrl_ack); return r;
return true; }
static void vhost_vdpa_net_cvq_stop(NetClientState *nc)
{
VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
if (s->vhost_vdpa.shadow_vqs_enabled) {
vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer);
vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->cvq_cmd_in_buffer);
}
} }
static NetClientInfo net_vhost_vdpa_cvq_info = { static NetClientInfo net_vhost_vdpa_cvq_info = {
.type = NET_CLIENT_DRIVER_VHOST_VDPA, .type = NET_CLIENT_DRIVER_VHOST_VDPA,
.size = sizeof(VhostVDPAState), .size = sizeof(VhostVDPAState),
.receive = vhost_vdpa_receive, .receive = vhost_vdpa_receive,
.start = vhost_vdpa_net_cvq_start,
.stop = vhost_vdpa_net_cvq_stop,
.cleanup = vhost_vdpa_cleanup, .cleanup = vhost_vdpa_cleanup,
.has_vnet_hdr = vhost_vdpa_has_vnet_hdr, .has_vnet_hdr = vhost_vdpa_has_vnet_hdr,
.has_ufo = vhost_vdpa_has_ufo, .has_ufo = vhost_vdpa_has_ufo,
@ -348,19 +347,17 @@ static NetClientInfo net_vhost_vdpa_cvq_info = {
* Do not forward commands not supported by SVQ. Otherwise, the device could * Do not forward commands not supported by SVQ. Otherwise, the device could
* accept it and qemu would not know how to update the device model. * accept it and qemu would not know how to update the device model.
*/ */
static bool vhost_vdpa_net_cvq_validate_cmd(const struct iovec *out, static bool vhost_vdpa_net_cvq_validate_cmd(const void *out_buf, size_t len)
size_t out_num)
{ {
struct virtio_net_ctrl_hdr ctrl; struct virtio_net_ctrl_hdr ctrl;
size_t n;
n = iov_to_buf(out, out_num, 0, &ctrl, sizeof(ctrl)); if (unlikely(len < sizeof(ctrl))) {
if (unlikely(n < sizeof(ctrl))) {
qemu_log_mask(LOG_GUEST_ERROR, qemu_log_mask(LOG_GUEST_ERROR,
"%s: invalid legnth of out buffer %zu\n", __func__, n); "%s: invalid legnth of out buffer %zu\n", __func__, len);
return false; return false;
} }
memcpy(&ctrl, out_buf, sizeof(ctrl));
switch (ctrl.class) { switch (ctrl.class) {
case VIRTIO_NET_CTRL_MAC: case VIRTIO_NET_CTRL_MAC:
switch (ctrl.cmd) { switch (ctrl.cmd) {
@ -392,10 +389,14 @@ static int vhost_vdpa_net_handle_ctrl_avail(VhostShadowVirtqueue *svq,
VhostVDPAState *s = opaque; VhostVDPAState *s = opaque;
size_t in_len, dev_written; size_t in_len, dev_written;
virtio_net_ctrl_ack status = VIRTIO_NET_ERR; virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
/* out and in buffers sent to the device */ /* Out buffer sent to both the vdpa device and the device model */
struct iovec dev_buffers[2] = { struct iovec out = {
{ .iov_base = s->cvq_cmd_out_buffer }, .iov_base = s->cvq_cmd_out_buffer,
{ .iov_base = s->cvq_cmd_in_buffer }, };
/* In buffer sent to the device */
const struct iovec dev_in = {
.iov_base = s->cvq_cmd_in_buffer,
.iov_len = sizeof(virtio_net_ctrl_ack),
}; };
/* in buffer used for device model */ /* in buffer used for device model */
const struct iovec in = { const struct iovec in = {
@ -405,17 +406,15 @@ static int vhost_vdpa_net_handle_ctrl_avail(VhostShadowVirtqueue *svq,
int r = -EINVAL; int r = -EINVAL;
bool ok; bool ok;
ok = vhost_vdpa_net_cvq_map_elem(s, elem, dev_buffers); out.iov_len = iov_to_buf(elem->out_sg, elem->out_num, 0,
s->cvq_cmd_out_buffer,
vhost_vdpa_net_cvq_cmd_len());
ok = vhost_vdpa_net_cvq_validate_cmd(s->cvq_cmd_out_buffer, out.iov_len);
if (unlikely(!ok)) { if (unlikely(!ok)) {
goto out; goto out;
} }
ok = vhost_vdpa_net_cvq_validate_cmd(&dev_buffers[0], 1); r = vhost_svq_add(svq, &out, 1, &dev_in, 1, elem);
if (unlikely(!ok)) {
goto out;
}
r = vhost_svq_add(svq, &dev_buffers[0], 1, &dev_buffers[1], 1, elem);
if (unlikely(r != 0)) { if (unlikely(r != 0)) {
if (unlikely(r == -ENOSPC)) { if (unlikely(r == -ENOSPC)) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: No space on device queue\n", qemu_log_mask(LOG_GUEST_ERROR, "%s: No space on device queue\n",
@ -435,13 +434,13 @@ static int vhost_vdpa_net_handle_ctrl_avail(VhostShadowVirtqueue *svq,
goto out; goto out;
} }
memcpy(&status, dev_buffers[1].iov_base, sizeof(status)); memcpy(&status, s->cvq_cmd_in_buffer, sizeof(status));
if (status != VIRTIO_NET_OK) { if (status != VIRTIO_NET_OK) {
goto out; goto out;
} }
status = VIRTIO_NET_ERR; status = VIRTIO_NET_ERR;
virtio_net_handle_ctrl_iov(svq->vdev, &in, 1, dev_buffers, 1); virtio_net_handle_ctrl_iov(svq->vdev, &in, 1, &out, 1);
if (status != VIRTIO_NET_OK) { if (status != VIRTIO_NET_OK) {
error_report("Bad CVQ processing in model"); error_report("Bad CVQ processing in model");
} }
@ -454,12 +453,6 @@ out:
} }
vhost_svq_push_elem(svq, elem, MIN(in_len, sizeof(status))); vhost_svq_push_elem(svq, elem, MIN(in_len, sizeof(status)));
g_free(elem); g_free(elem);
if (dev_buffers[0].iov_base) {
vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, dev_buffers[0].iov_base);
}
if (dev_buffers[1].iov_base) {
vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, dev_buffers[1].iov_base);
}
return r; return r;
} }