diff options
| author | Eli Cohen <elic@nvidia.com> | 2021-06-03 11:11:53 +0300 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2021-07-08 14:49:01 +0300 |
| commit | b57c46cb3c3bca46e1f0b258493572d234362de8 (patch) | |
| tree | ee538c603f56d5e7e825d29d2a2f902bbed3d879 /drivers/vdpa | |
| parent | a7766ef18b33674fa164e2e2916cef16d4e17f43 (diff) | |
| download | linux-b57c46cb3c3bca46e1f0b258493572d234362de8.tar.xz | |
vdpa/mlx5: Add support for doorbell bypassing
Implement mlx5_get_vq_notification() to return the doorbell address.
Since the notification area is mapped to userspace, make sure that the
BAR size is at least PAGE_SIZE large.
Signed-off-by: Eli Cohen <elic@nvidia.com>
Link: https://lore.kernel.org/r/20210603081153.5750-1-elic@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Diffstat (limited to 'drivers/vdpa')
| -rw-r--r-- | drivers/vdpa/mlx5/core/mlx5_vdpa.h | 1 | ||||
| -rw-r--r-- | drivers/vdpa/mlx5/core/resources.c | 1 | ||||
| -rw-r--r-- | drivers/vdpa/mlx5/net/mlx5_vnet.c | 14 |
3 files changed, 16 insertions, 0 deletions
diff --git a/drivers/vdpa/mlx5/core/mlx5_vdpa.h b/drivers/vdpa/mlx5/core/mlx5_vdpa.h index 09a16a3d1b2a..0002b2136b48 100644 --- a/drivers/vdpa/mlx5/core/mlx5_vdpa.h +++ b/drivers/vdpa/mlx5/core/mlx5_vdpa.h @@ -42,6 +42,7 @@ struct mlx5_vdpa_resources { u32 pdn; struct mlx5_uars_page *uar; void __iomem *kick_addr; + u64 phys_kick_addr; u16 uid; u32 null_mkey; bool valid; diff --git a/drivers/vdpa/mlx5/core/resources.c b/drivers/vdpa/mlx5/core/resources.c index 836ab9ef0fa6..d4606213f88a 100644 --- a/drivers/vdpa/mlx5/core/resources.c +++ b/drivers/vdpa/mlx5/core/resources.c @@ -253,6 +253,7 @@ int mlx5_vdpa_alloc_resources(struct mlx5_vdpa_dev *mvdev) goto err_key; kick_addr = mdev->bar_addr + offset; + res->phys_kick_addr = kick_addr; res->kick_addr = ioremap(kick_addr, PAGE_SIZE); if (!res->kick_addr) { diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c index d404ea72514d..8e29b57435bc 100644 --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c @@ -1876,8 +1876,22 @@ static void mlx5_vdpa_free(struct vdpa_device *vdev) static struct vdpa_notification_area mlx5_get_vq_notification(struct vdpa_device *vdev, u16 idx) { + struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev); struct vdpa_notification_area ret = {}; + struct mlx5_vdpa_net *ndev; + phys_addr_t addr; + /* If SF BAR size is smaller than PAGE_SIZE, do not use direct + * notification to avoid the risk of mapping pages that contain BAR of more + * than one SF + */ + if (MLX5_CAP_GEN(mvdev->mdev, log_min_sf_size) + 12 < PAGE_SHIFT) + return ret; + + ndev = to_mlx5_vdpa_ndev(mvdev); + addr = (phys_addr_t)ndev->mvdev.res.phys_kick_addr; + ret.addr = addr; + ret.size = PAGE_SIZE; return ret; } |