Si-Wei Liu
2021-Dec-01 01:43 UTC
[PATCH 2/2] vdpa/mlx5: Support configuring max data virtqueues
On 11/30/2021 1:48 AM, Eli Cohen wrote:> Check if the required number of data virtqueues was provided when a > adding a new device and verify the new value does not exceed device > capabilities. > > In addition, change the arrays holding virtqueue and callback contexts > to be dynamically allocated. > > Signed-off-by: Eli Cohen <elic at nvidia.com> > --- > drivers/vdpa/mlx5/net/mlx5_vnet.c | 32 +++++++++++++++++++------------ > 1 file changed, 20 insertions(+), 12 deletions(-) > > diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c > index 63813fbb5f62..54e276e0df18 100644 > --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c > +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c > @@ -131,11 +131,6 @@ struct mlx5_vdpa_virtqueue { > struct mlx5_vq_restore_info ri; > }; > > -/* We will remove this limitation once mlx5_vdpa_alloc_resources() > - * provides for driver space allocation > - */ > -#define MLX5_MAX_SUPPORTED_VQS 16 > - > static bool is_index_valid(struct mlx5_vdpa_dev *mvdev, u16 idx) > { > if (unlikely(idx > mvdev->max_idx)) > @@ -148,8 +143,8 @@ struct mlx5_vdpa_net { > struct mlx5_vdpa_dev mvdev; > struct mlx5_vdpa_net_resources res; > struct virtio_net_config config; > - struct mlx5_vdpa_virtqueue vqs[MLX5_MAX_SUPPORTED_VQS]; > - struct vdpa_callback event_cbs[MLX5_MAX_SUPPORTED_VQS + 1]; > + struct mlx5_vdpa_virtqueue *vqs; > + struct vdpa_callback *event_cbs; > > /* Serialize vq resources creation and destruction. This is required > * since memory map might change and we need to destroy and create > @@ -1218,7 +1213,7 @@ static void suspend_vqs(struct mlx5_vdpa_net *ndev) > { > int i; > > - for (i = 0; i < MLX5_MAX_SUPPORTED_VQS; i++) > + for (i = 0; i < ndev->mvdev.max_vqs; i++) > suspend_vq(ndev, &ndev->vqs[i]); > } > > @@ -1245,7 +1240,7 @@ static int create_rqt(struct mlx5_vdpa_net *ndev) > int i, j; > int err; > > - max_rqt = min_t(int, MLX5_MAX_SUPPORTED_VQS / 2, > + max_rqt = min_t(int, ndev->mvdev.max_vqs / 2, > 1 << MLX5_CAP_GEN(ndev->mvdev.mdev, log_max_rqt_size));Here the user configured number of data vqs may get silently capped to what the device can support (up to 2^log_max_rqt_size). Do you consider expose this device specific capacity to vdpa users so it doesn't get blindly misconfigured, and/or return appropriate error message to indicate the failure cause? If mlx5 vdpa really can't support power of 2 number of data vqs due to hardware limitation (?), an appropriate message should be returned here. -Siwei> if (max_rqt < 1) > return -EOPNOTSUPP; > @@ -2235,7 +2230,7 @@ static int mlx5_vdpa_reset(struct vdpa_device *vdev) > clear_vqs_ready(ndev); > mlx5_vdpa_destroy_mr(&ndev->mvdev); > ndev->mvdev.status = 0; > - memset(ndev->event_cbs, 0, sizeof(ndev->event_cbs)); > + memset(ndev->event_cbs, 0, sizeof(*ndev->event_cbs) * (mvdev->max_vqs + 1)); > ndev->mvdev.actual_features = 0; > ++mvdev->generation; > if (MLX5_CAP_GEN(mvdev->mdev, umem_uid_0)) { > @@ -2308,6 +2303,8 @@ static void mlx5_vdpa_free(struct vdpa_device *vdev) > } > mlx5_vdpa_free_resources(&ndev->mvdev); > mutex_destroy(&ndev->reslock); > + kfree(ndev->event_cbs); > + kfree(ndev->vqs); > } > > static struct vdpa_notification_area mlx5_get_vq_notification(struct vdpa_device *vdev, u16 idx) > @@ -2547,13 +2544,23 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name, > > /* we save one virtqueue for control virtqueue should we require it */ > max_vqs = MLX5_CAP_DEV_VDPA_EMULATION(mdev, max_num_virtio_queues); > - max_vqs = min_t(u32, max_vqs, MLX5_MAX_SUPPORTED_VQS); > + if (add_config->mask & BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MAX_VQP)) { > + if (add_config->max_virtqueues > max_vqs) > + return -EINVAL; > + max_vqs = min_t(u32, max_vqs, add_config->max_virtqueues); > + } > > ndev = vdpa_alloc_device(struct mlx5_vdpa_net, mvdev.vdev, mdev->device, &mlx5_vdpa_ops, > name, false); > if (IS_ERR(ndev)) > return PTR_ERR(ndev); > > + ndev->vqs = kcalloc(max_vqs, sizeof(*ndev->vqs), GFP_KERNEL); > + ndev->event_cbs = kcalloc(max_vqs + 1, sizeof(*ndev->event_cbs), GFP_KERNEL); > + if (!ndev->vqs || !ndev->event_cbs) { > + err = -ENOMEM; > + goto err_mtu; > + } > ndev->mvdev.max_vqs = max_vqs; > mvdev = &ndev->mvdev; > mvdev->mdev = mdev; > @@ -2676,7 +2683,8 @@ static int mlx5v_probe(struct auxiliary_device *adev, > mgtdev->mgtdev.ops = &mdev_ops; > mgtdev->mgtdev.device = mdev->device; > mgtdev->mgtdev.id_table = id_table; > - mgtdev->mgtdev.config_attr_mask = (1 << VDPA_ATTR_DEV_NET_CFG_MACADDR); > + mgtdev->mgtdev.config_attr_mask = BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MACADDR) | > + BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MAX_VQP); > mgtdev->madev = madev; > > err = vdpa_mgmtdev_register(&mgtdev->mgtdev);