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vdpa/mlx5: Support creating resources with uid == 0

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Currently all resources must be created with uid != 0 which is essential
when userspace processes are allocating virtquueue resources. Since this
is a kernel implementation, it is perfectly legal to open resources with
uid == 0.

In case firmware supports, avoid allocating user context.

Signed-off-by: Eli Cohen <elic@nvidia.com>
Link: https://lore.kernel.org/r/20210531160404.31368-1-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 2021-05-31 19:04:04 +03:00 committed by Michael S. Tsirkin
parent 71ab6a7cfb
commit e13cd45d35
2 changed files with 9 additions and 1 deletions
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6
drivers/vdpa/mlx5/core/resources.c
View File

@ -54,6 +54,9 @@ static int create_uctx(struct mlx5_vdpa_dev *mvdev, u16 *uid)
void *in;
int err;
if (MLX5_CAP_GEN(mvdev->mdev, umem_uid_0))
return 0;
/* 0 means not supported */
if (!MLX5_CAP_GEN(mvdev->mdev, log_max_uctx))
return -EOPNOTSUPP;
@ -79,6 +82,9 @@ static void destroy_uctx(struct mlx5_vdpa_dev *mvdev, u32 uid)
u32 out[MLX5_ST_SZ_DW(destroy_uctx_out)] = {};
u32 in[MLX5_ST_SZ_DW(destroy_uctx_in)] = {};
if (!uid)
return;
MLX5_SET(destroy_uctx_in, in, opcode, MLX5_CMD_OP_DESTROY_UCTX);
MLX5_SET(destroy_uctx_in, in, uid, uid);

4
include/linux/mlx5/mlx5_ifc.h
View File

@ -1512,7 +1512,9 @@ struct mlx5_ifc_cmd_hca_cap_bits {
u8 uar_4k[0x1];
u8 reserved_at_241[0x9];
u8 uar_sz[0x6];
u8 reserved_at_250[0x8];
u8 reserved_at_248[0x2];
u8 umem_uid_0[0x1];
u8 reserved_at_250[0x5];
u8 log_pg_sz[0x8];
u8 bf[0x1];