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Commit f6fe01b7 authored by Yishai Hadas's avatar Yishai Hadas Committed by Jason Gunthorpe
Browse files

IB/mlx5: Add DEVX query EQN support 



Return the matching device EQN for a given user vector number via the
DEVX interface.

Note:
EQs are owned by the kernel and shared by all user processes.
Basically, a user CQ can point to any EQ.
The kernel doesn't enforce any such limitation today either.

Signed-off-by: default avatarYishai Hadas <yishaih@mellanox.com>
Signed-off-by: default avatarLeon Romanovsky <leonro@mellanox.com>
Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
parent aeae9457

drivers/infiniband/hw/mlx5/devx.c

+33 −1
Original line number Diff line number Diff line
@@ -389,6 +389,31 @@ static bool devx_is_general_cmd(void *in) 
	}

}



static int UVERBS_HANDLER(MLX5_IB_METHOD_DEVX_QUERY_EQN)(struct ib_device *ib_dev,

				  struct ib_uverbs_file *file,

				  struct uverbs_attr_bundle *attrs)

{

	struct mlx5_ib_dev *dev = to_mdev(ib_dev);

	int user_vector;

	int dev_eqn;

	unsigned int irqn;

	int err;



	if (uverbs_copy_from(&user_vector, attrs,

			     MLX5_IB_ATTR_DEVX_QUERY_EQN_USER_VEC))

		return -EFAULT;



	err = mlx5_vector2eqn(dev->mdev, user_vector, &dev_eqn, &irqn);

	if (err < 0)

		return err;



	if (uverbs_copy_to(attrs, MLX5_IB_ATTR_DEVX_QUERY_EQN_DEV_EQN,

			   &dev_eqn, sizeof(dev_eqn)))

		return -EFAULT;



	return 0;

}



/*

 *Security note:

 * The hardware protection mechanism works like this: Each device object that
@@ -979,6 +1004,12 @@ static DECLARE_UVERBS_NAMED_METHOD(MLX5_IB_METHOD_DEVX_UMEM_DEREG, 
			 UVERBS_ACCESS_DESTROY,

			 UA_FLAGS(UVERBS_ATTR_SPEC_F_MANDATORY)));



static DECLARE_UVERBS_NAMED_METHOD(MLX5_IB_METHOD_DEVX_QUERY_EQN,

	&UVERBS_ATTR_PTR_IN(MLX5_IB_ATTR_DEVX_QUERY_EQN_USER_VEC, UVERBS_ATTR_TYPE(u32),

			    UA_FLAGS(UVERBS_ATTR_SPEC_F_MANDATORY)),

	&UVERBS_ATTR_PTR_OUT(MLX5_IB_ATTR_DEVX_QUERY_EQN_DEV_EQN, UVERBS_ATTR_TYPE(u32),

			     UA_FLAGS(UVERBS_ATTR_SPEC_F_MANDATORY)));



static DECLARE_UVERBS_NAMED_METHOD(MLX5_IB_METHOD_DEVX_QUERY_UAR,

	&UVERBS_ATTR_PTR_IN(MLX5_IB_ATTR_DEVX_QUERY_UAR_USER_IDX, UVERBS_ATTR_TYPE(u32),

			    UA_FLAGS(UVERBS_ATTR_SPEC_F_MANDATORY)),
@@ -1050,7 +1081,8 @@ static DECLARE_UVERBS_NAMED_METHOD(MLX5_IB_METHOD_DEVX_OBJ_QUERY, 


static DECLARE_UVERBS_GLOBAL_METHODS(MLX5_IB_OBJECT_DEVX,

	&UVERBS_METHOD(MLX5_IB_METHOD_DEVX_OTHER),

	&UVERBS_METHOD(MLX5_IB_METHOD_DEVX_QUERY_UAR));

	&UVERBS_METHOD(MLX5_IB_METHOD_DEVX_QUERY_UAR),

	&UVERBS_METHOD(MLX5_IB_METHOD_DEVX_QUERY_EQN));



static DECLARE_UVERBS_NAMED_OBJECT(MLX5_IB_OBJECT_DEVX_OBJ,

	&UVERBS_TYPE_ALLOC_IDR(0, devx_obj_cleanup),

include/uapi/rdma/mlx5_user_ioctl_cmds.h

+6 −0
Original line number Diff line number Diff line
@@ -48,6 +48,7 @@ enum mlx5_ib_alloc_dm_attrs { 
enum mlx5_ib_devx_methods {

	MLX5_IB_METHOD_DEVX_OTHER  = (1U << UVERBS_ID_NS_SHIFT),

	MLX5_IB_METHOD_DEVX_QUERY_UAR,

	MLX5_IB_METHOD_DEVX_QUERY_EQN,

};



enum  mlx5_ib_devx_other_attrs {
@@ -82,6 +83,11 @@ enum mlx5_ib_devx_obj_query_attrs { 
	MLX5_IB_ATTR_DEVX_OBJ_QUERY_CMD_OUT,

};



enum  mlx5_ib_devx_query_eqn_attrs {

	MLX5_IB_ATTR_DEVX_QUERY_EQN_USER_VEC = (1U << UVERBS_ID_NS_SHIFT),

	MLX5_IB_ATTR_DEVX_QUERY_EQN_DEV_EQN,

};



enum mlx5_ib_devx_obj_methods {

	MLX5_IB_METHOD_DEVX_OBJ_CREATE = (1U << UVERBS_ID_NS_SHIFT),

	MLX5_IB_METHOD_DEVX_OBJ_DESTROY,