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vdpa/mlx5: Add support for doorbell bypassing

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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>
This commit is contained in:
Eli Cohen 2021-06-03 11:11:53 +03:00 committed by Michael S. Tsirkin
parent a7766ef18b
commit b57c46cb3c
3 changed files with 16 additions and 0 deletions
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1
drivers/vdpa/mlx5/core/mlx5_vdpa.h
View File

@ -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;

1
drivers/vdpa/mlx5/core/resources.c
View File

@ -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) {

14
drivers/vdpa/mlx5/net/mlx5_vnet.c
View File

@ -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;
}