On Thu, Dec 15, 2022 at 7:32 PM Eugenio Pérez <eperezma@xxxxxxxxxx> wrote:
>
> Currently iova range is requested once per queue pair in the case of
> net. Reduce the number of ioctls asking it once at initialization and
> reusing that value for each vhost_vdpa.
>
> Signed-off-by: Eugenio Pérez <eperezma@xxxxxxxxxx>
> ---
> hw/virtio/vhost-vdpa.c | 15 ---------------
> net/vhost-vdpa.c | 27 ++++++++++++++-------------
> 2 files changed, 14 insertions(+), 28 deletions(-)
>
> diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
> index 691bcc811a..9b7f4ef083 100644
> --- a/hw/virtio/vhost-vdpa.c
> +++ b/hw/virtio/vhost-vdpa.c
> @@ -365,19 +365,6 @@ static int vhost_vdpa_add_status(struct vhost_dev *dev, uint8_t status)
> return 0;
> }
>
> -static void vhost_vdpa_get_iova_range(struct vhost_vdpa *v)
> -{
> - int ret = vhost_vdpa_call(v->dev, VHOST_VDPA_GET_IOVA_RANGE,
> - &v->iova_range);
> - if (ret != 0) {
> - v->iova_range.first = 0;
> - v->iova_range.last = UINT64_MAX;
> - }
> -
> - trace_vhost_vdpa_get_iova_range(v->dev, v->iova_range.first,
> - v->iova_range.last);
> -}
> -
> /*
> * The use of this function is for requests that only need to be
> * applied once. Typically such request occurs at the beginning
> @@ -465,8 +452,6 @@ static int vhost_vdpa_init(struct vhost_dev *dev, void *opaque, Error **errp)
> goto err;
> }
>
> - vhost_vdpa_get_iova_range(v);
> -
> if (!vhost_vdpa_first_dev(dev)) {
> return 0;
> }
> diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
> index 2c0ff6d7b0..b6462f0192 100644
> --- a/net/vhost-vdpa.c
> +++ b/net/vhost-vdpa.c
> @@ -541,14 +541,15 @@ static const VhostShadowVirtqueueOps vhost_vdpa_net_svq_ops = {
> };
>
> static NetClientState *net_vhost_vdpa_init(NetClientState *peer,
> - const char *device,
> - const char *name,
> - int vdpa_device_fd,
> - int queue_pair_index,
> - int nvqs,
> - bool is_datapath,
> - bool svq,
> - VhostIOVATree *iova_tree)
> + const char *device,
> + const char *name,
> + int vdpa_device_fd,
> + int queue_pair_index,
> + int nvqs,
> + bool is_datapath,
> + bool svq,
> + struct vhost_vdpa_iova_range iova_range,
> + VhostIOVATree *iova_tree)
Nit: it's better not mix style changes.
Other than this:
Acked-by: Jason Wang <jasonwang@xxxxxxxxxx>
Thanks
> {
> NetClientState *nc = NULL;
> VhostVDPAState *s;
> @@ -567,6 +568,7 @@ static NetClientState *net_vhost_vdpa_init(NetClientState *peer,
> s->vhost_vdpa.device_fd = vdpa_device_fd;
> s->vhost_vdpa.index = queue_pair_index;
> s->vhost_vdpa.shadow_vqs_enabled = svq;
> + s->vhost_vdpa.iova_range = iova_range;
> s->vhost_vdpa.iova_tree = iova_tree;
> if (!is_datapath) {
> s->cvq_cmd_out_buffer = qemu_memalign(qemu_real_host_page_size(),
> @@ -646,6 +648,7 @@ int net_init_vhost_vdpa(const Netdev *netdev, const char *name,
> int vdpa_device_fd;
> g_autofree NetClientState **ncs = NULL;
> g_autoptr(VhostIOVATree) iova_tree = NULL;
> + struct vhost_vdpa_iova_range iova_range;
> NetClientState *nc;
> int queue_pairs, r, i = 0, has_cvq = 0;
>
> @@ -689,14 +692,12 @@ int net_init_vhost_vdpa(const Netdev *netdev, const char *name,
> return queue_pairs;
> }
>
> + vhost_vdpa_get_iova_range(vdpa_device_fd, &iova_range);
> if (opts->x_svq) {
> - struct vhost_vdpa_iova_range iova_range;
> -
> if (!vhost_vdpa_net_valid_svq_features(features, errp)) {
> goto err_svq;
> }
>
> - vhost_vdpa_get_iova_range(vdpa_device_fd, &iova_range);
> iova_tree = vhost_iova_tree_new(iova_range.first, iova_range.last);
> }
>
> @@ -705,7 +706,7 @@ int net_init_vhost_vdpa(const Netdev *netdev, const char *name,
> for (i = 0; i < queue_pairs; i++) {
> ncs[i] = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name,
> vdpa_device_fd, i, 2, true, opts->x_svq,
> - iova_tree);
> + iova_range, iova_tree);
> if (!ncs[i])
> goto err;
> }
> @@ -713,7 +714,7 @@ int net_init_vhost_vdpa(const Netdev *netdev, const char *name,
> if (has_cvq) {
> nc = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name,
> vdpa_device_fd, i, 1, false,
> - opts->x_svq, iova_tree);
> + opts->x_svq, iova_range, iova_tree);
> if (!nc)
> goto err;
> }
> --
> 2.31.1
>
