nvme.h File Reference

Nvme block device abstraction layer. More...

Data Structures
struct	spdk_bdev_nvme_ctrlr_opts
struct	spdk_bdev_nvme_opts

Typedefs
typedef void(*	spdk_bdev_nvme_create_cb) (void *ctx, size_t bdev_count, int rc)
typedef void(*	spdk_bdev_nvme_set_multipath_policy_cb) (void *cb_arg, int rc)
typedef void(*	spdk_bdev_nvme_delete_cb) (void *ctx, int rc)

Enumerations
enum	spdk_bdev_nvme_multipath_policy { BDEV_NVME_MP_POLICY_ACTIVE_PASSIVE , BDEV_NVME_MP_POLICY_ACTIVE_ACTIVE }
enum	spdk_bdev_nvme_multipath_selector { BDEV_NVME_MP_SELECTOR_ROUND_ROBIN = 1 , BDEV_NVME_MP_SELECTOR_QUEUE_DEPTH }
enum	spdk_bdev_timeout_action { SPDK_BDEV_NVME_TIMEOUT_ACTION_NONE = 0 , SPDK_BDEV_NVME_TIMEOUT_ACTION_RESET , SPDK_BDEV_NVME_TIMEOUT_ACTION_ABORT }

Functions
	SPDK_STATIC_ASSERT (sizeof(struct spdk_bdev_nvme_opts)==136, "Incorrect size")
int	spdk_bdev_nvme_create (struct spdk_nvme_transport_id *trid, const char *base_name, const char **names, uint32_t count, spdk_bdev_nvme_create_cb cb_fn, void *cb_ctx, struct spdk_nvme_ctrlr_opts *drv_opts, struct spdk_bdev_nvme_ctrlr_opts *bdev_opts)
	Connect to the NVMe controller and populate namespaces as bdevs.
int	spdk_bdev_nvme_delete (const char *name, const struct spdk_nvme_path_id *path_id, spdk_bdev_nvme_delete_cb delete_cb, void *cb_ctx)
	Delete the specified NVMe controller, or one of its paths.
void	spdk_bdev_nvme_set_multipath_policy (const char *name, enum spdk_bdev_nvme_multipath_policy policy, enum spdk_bdev_nvme_multipath_selector selector, uint32_t rr_min_io, spdk_bdev_nvme_set_multipath_policy_cb cb_fn, void *cb_arg)
	Set multipath policy of the NVMe bdev.
void	spdk_bdev_nvme_get_default_ctrlr_opts (struct spdk_bdev_nvme_ctrlr_opts *opts)
void	spdk_bdev_nvme_get_opts (struct spdk_bdev_nvme_opts *opts, size_t opts_size)
	Get the default value for bdev nvme options.
int	spdk_bdev_nvme_set_opts (const struct spdk_bdev_nvme_opts *opts)
	Set the bdev nvme options.

Detailed Description

Nvme block device abstraction layer.

Function Documentation

spdk_bdev_nvme_create()

int spdk_bdev_nvme_create	(	struct spdk_nvme_transport_id *	trid,
		const char *	base_name,
		const char **	names,
		uint32_t	count,
		spdk_bdev_nvme_create_cb	cb_fn,
		void *	cb_ctx,
		struct spdk_nvme_ctrlr_opts *	drv_opts,
		struct spdk_bdev_nvme_ctrlr_opts *	bdev_opts )

Connect to the NVMe controller and populate namespaces as bdevs.

Parameters

trid	Transport ID for nvme controller.
base_name	Base name for the nvme subsystem.
names	Pointer to string array to get bdev names.
count	Maximum count of the string array 'names'. Restricts the length of 'names' array only, not the count of bdevs created.
cb_fn	Callback function to be called after all the bdevs are created or updated if already created.
cb_ctx	Context to pass to cb_fn.
drv_opts	NVMe driver options.
bdev_opts	NVMe bdev options.

Returns

0 on success, negative errno on failure.

spdk_bdev_nvme_delete()

int spdk_bdev_nvme_delete	(	const char *	name,
		const struct spdk_nvme_path_id *	path_id,
		spdk_bdev_nvme_delete_cb	delete_cb,
		void *	cb_ctx )

Delete the specified NVMe controller, or one of its paths.

NOTE: When path_id is specified and it is the only path_id associated with NVMe controller the path is removed and the NVMe controller gets deleted. (Optional) callback function gets executed on delete complete in caller's thread. When the (optional) callback is not provided, the control is returned back at the time delete is initiated, not when it is completed. When NVMe controller deletion is already in progress state, this function returns success.

Parameters

name	NVMe controller name.
path_id	The specified path to remove (optional).
delete_cb	Callback function on delete complete (optional).
cb_ctx	Context passed to callback (optional).

Returns

zero on success, -EINVAL on wrong parameters or -ENODEV if controller is not found or -ENOMEM on no memory

spdk_bdev_nvme_get_opts()

void spdk_bdev_nvme_get_opts	(	struct spdk_bdev_nvme_opts *	opts,
		size_t	opts_size )

Get the default value for bdev nvme options.

Parameters

[out]	opts	Bdev nvme options object to be filled with default values.
	opts_size	Must be set to sizeof(struct spdk_bdev_nvme_opts).

spdk_bdev_nvme_set_multipath_policy()

void spdk_bdev_nvme_set_multipath_policy	(	const char *	name,
		enum spdk_bdev_nvme_multipath_policy	policy,
		enum spdk_bdev_nvme_multipath_selector	selector,
		uint32_t	rr_min_io,
		spdk_bdev_nvme_set_multipath_policy_cb	cb_fn,
		void *	cb_arg )

Set multipath policy of the NVMe bdev.

Parameters

name	NVMe bdev name.
policy	Multipath policy (active-passive or active-active).
selector	Multipath selector (round_robin, queue_depth).
rr_min_io	Number of IO to route to a path before switching to another for round-robin.
cb_fn	Function to be called back after completion.
cb_arg	Argument passed to the callback function.

spdk_bdev_nvme_set_opts()

int spdk_bdev_nvme_set_opts

(

const struct spdk_bdev_nvme_opts *

opts

)

Set the bdev nvme options.

Parameters

opts	New value of bdev nvme options to be set.

Returns

0 on success, negative errno on failure.