xref: /dpdk/lib/rawdev/rte_rawdev.h (revision 99a2dd95)

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright 2017 NXP
 */

#ifndef _RTE_RAWDEV_H_
#define _RTE_RAWDEV_H_

/**
 * @file rte_rawdev.h
 *
 * Generic device abstraction APIs.
 *
 * This API allow applications to configure and use generic devices having
 * no specific type already available in DPDK.
 */

#ifdef __cplusplus
extern "C" {
#endif

#include <rte_common.h>
#include <rte_memory.h>
#include <rte_errno.h>

/* Rawdevice object - essentially a void to be typecast by implementation */
typedef void *rte_rawdev_obj_t;

/**
 * Get the total number of raw devices that have been successfully
 * initialised.
 *
 * @return
 *   The total number of usable raw devices.
 */
uint8_t
rte_rawdev_count(void);

/**
 * Get the device identifier for the named raw device.
 *
 * @param name
 *   Raw device name to select the raw device identifier.
 *
 * @return
 *   Returns raw device identifier on success.
 *   - <0: Failure to find named raw device.
 */
uint16_t
rte_rawdev_get_dev_id(const char *name);

/**
 * Return the NUMA socket to which a device is connected.
 *
 * @param dev_id
 *   The identifier of the device.
 * @return
 *   The NUMA socket id to which the device is connected or
 *   a default of zero if the socket could not be determined.
 *   -(-EINVAL)  dev_id value is out of range.
 */
int
rte_rawdev_socket_id(uint16_t dev_id);

/**
 * Raw device information forward declaration
 */
struct rte_rawdev_info;

/**
 * Retrieve the contextual information of a raw device.
 *
 * @param dev_id
 *   The identifier of the device.
 *
 * @param[out] dev_info
 *   A pointer to a structure of type *rte_rawdev_info* to be filled with the
 *   contextual information of the device. The dev_info->dev_private field
 *   should point to an appropriate buffer space for holding the device-
 *   specific info for that hardware.
 *   If the dev_private field is set to NULL, then the device-specific info
 *   function will not be called and only basic information about the device
 *   will be returned. This can be used to safely query the type of a rawdev
 *   instance without needing to know the size of the private data to return.
 *
 * @param dev_private_size
 *   The length of the memory space pointed to by dev_private in dev_info.
 *   This should be set to the size of the expected private structure to be
 *   returned, and may be checked by drivers to ensure the expected struct
 *   type is provided.
 *
 * @return
 *   - 0: Success, driver updates the contextual information of the raw device
 *   - <0: Error code returned by the driver info get function.
 *
 */
int
rte_rawdev_info_get(uint16_t dev_id, struct rte_rawdev_info *dev_info,
		size_t dev_private_size);

/**
 * Configure a raw device.
 *
 * This function must be invoked first before any other function in the
 * API. This function can also be re-invoked when a device is in the
 * stopped state.
 *
 * The caller may use rte_rawdev_info_get() to get the capability of each
 * resources available for this raw device.
 *
 * @param dev_id
 *   The identifier of the device to configure.
 * @param dev_conf
 *   The raw device configuration structure encapsulated into rte_rawdev_info
 *   object.
 *   It is assumed that the opaque object has enough information which the
 *   driver/implementation can use to configure the device. It is also assumed
 *   that once the configuration is done, a `queue_id` type field can be used
 *   to refer to some arbitrary internal representation of a queue.
 * @param dev_private_size
 *   The length of the memory space pointed to by dev_private in dev_info.
 *   This should be set to the size of the expected private structure to be
 *   used by the driver, and may be checked by drivers to ensure the expected
 *   struct type is provided.
 *
 * @return
 *   - 0: Success, device configured.
 *   - <0: Error code returned by the driver configuration function.
 */
int
rte_rawdev_configure(uint16_t dev_id, struct rte_rawdev_info *dev_conf,
		size_t dev_private_size);


/**
 * Retrieve the current configuration information of a raw queue designated
 * by its *queue_id* from the raw driver for a raw device.
 *
 * This function intended to be used in conjunction with rte_raw_queue_setup()
 * where caller needs to set up the queue by overriding few default values.
 *
 * @param dev_id
 *   The identifier of the device.
 * @param queue_id
 *   The index of the raw queue to get the configuration information.
 *   The value must be in the range [0, nb_raw_queues - 1]
 *   previously supplied to rte_rawdev_configure().
 * @param[out] queue_conf
 *   The pointer to the default raw queue configuration data.
 * @param queue_conf_size
 *   The size of the structure pointed to by queue_conf
 * @return
 *   - 0: Success, driver updates the default raw queue configuration data.
 *   - <0: Error code returned by the driver info get function.
 *
 * @see rte_raw_queue_setup()
 *
 */
int
rte_rawdev_queue_conf_get(uint16_t dev_id,
			  uint16_t queue_id,
			  rte_rawdev_obj_t queue_conf,
			  size_t queue_conf_size);

/**
 * Allocate and set up a raw queue for a raw device.
 *
 * @param dev_id
 *   The identifier of the device.
 * @param queue_id
 *   The index of the raw queue to setup. The value must be in the range
 *   [0, nb_raw_queues - 1] previously supplied to rte_rawdev_configure().
 * @param queue_conf
 *   The pointer to the configuration data to be used for the raw queue.
 *   NULL value is allowed, in which case default configuration	used.
 * @param queue_conf_size
 *   The size of the structure pointed to by queue_conf
 *
 * @see rte_rawdev_queue_conf_get()
 *
 * @return
 *   - 0: Success, raw queue correctly set up.
 *   - <0: raw queue configuration failed
 */
int
rte_rawdev_queue_setup(uint16_t dev_id,
		       uint16_t queue_id,
		       rte_rawdev_obj_t queue_conf,
		       size_t queue_conf_size);

/**
 * Release and deallocate a raw queue from a raw device.
 *
 * @param dev_id
 *   The identifier of the device.
 * @param queue_id
 *   The index of the raw queue to release. The value must be in the range
 *   [0, nb_raw_queues - 1] previously supplied to rte_rawdev_configure().
 *
 * @see rte_rawdev_queue_conf_get()
 *
 * @return
 *   - 0: Success, raw queue released.
 *   - <0: raw queue configuration failed
 */
int
rte_rawdev_queue_release(uint16_t dev_id, uint16_t queue_id);

/**
 * Get the number of raw queues on a specific raw device
 *
 * @param dev_id
 *   Raw device identifier.
 * @return
 *   - The number of configured raw queues
 */
uint16_t
rte_rawdev_queue_count(uint16_t dev_id);

/**
 * Start a raw device.
 *
 * The device start step is the last one and consists of setting the raw
 * queues to start accepting the raws and schedules to raw ports.
 *
 * On success, all basic functions exported by the API (raw enqueue,
 * raw dequeue and so on) can be invoked.
 *
 * @param dev_id
 *   Raw device identifier
 * @return
 *   - 0: Success, device started.
 *   < 0: Failure
 */
int
rte_rawdev_start(uint16_t dev_id);

/**
 * Stop a raw device. The device can be restarted with a call to
 * rte_rawdev_start()
 *
 * @param dev_id
 *   Raw device identifier.
 */
void
rte_rawdev_stop(uint16_t dev_id);

/**
 * Close a raw device. The device cannot be restarted after this call.
 *
 * @param dev_id
 *   Raw device identifier
 *
 * @return
 *  - 0 on successfully closing device
 *  - <0 on failure to close device
 *  - (-EAGAIN) if device is busy
 */
int
rte_rawdev_close(uint16_t dev_id);

/**
 * Reset a raw device.
 * This is different from cycle of rte_rawdev_start->rte_rawdev_stop in the
 * sense similar to hard or soft reset.
 *
 * @param dev_id
 *   Raw device identifiers
 * @return
 *   0 for successful reset,
 *  !0 for failure in resetting
 */
int
rte_rawdev_reset(uint16_t dev_id);

#define RTE_RAWDEV_NAME_MAX_LEN	(64)
/**< @internal Max length of name of raw PMD */



/** @internal
 * The data structure associated with each raw device.
 * It is a placeholder for PMD specific data, encapsulating only information
 * related to framework.
 */
struct rte_rawdev {
	/**< Socket ID where memory is allocated */
	int socket_id;
	/**< Device ID for this instance */
	uint16_t dev_id;
	/**< Functions exported by PMD */
	const struct rte_rawdev_ops *dev_ops;
	/**< Device info. supplied during device initialization */
	struct rte_device *device;
	/**< Driver info. supplied by probing */
	const char *driver_name;

	RTE_STD_C11
	/**< Flag indicating the device is attached */
	uint8_t attached : 1;
	/**< Device state: STARTED(1)/STOPPED(0) */
	uint8_t started : 1;

	/**< PMD-specific private data */
	rte_rawdev_obj_t dev_private;
	/**< Device name */
	char name[RTE_RAWDEV_NAME_MAX_LEN];
} __rte_cache_aligned;

/** @internal The pool of rte_rawdev structures. */
extern struct rte_rawdev *rte_rawdevs;


struct rte_rawdev_info {
	/**< Name of driver handling this device */
	const char *driver_name;
	/**< Device encapsulation */
	struct rte_device *device;
	/**< Socket ID where memory is allocated */
	int socket_id;
	/**< PMD-specific private data */
	rte_rawdev_obj_t dev_private;
};

struct rte_rawdev_buf {
	/**< Opaque buffer reference */
	void *buf_addr;
};

/**
 * Dump internal information about *dev_id* to the FILE* provided in *f*.
 *
 * @param dev_id
 *   The identifier of the device.
 *
 * @param f
 *   A pointer to a file for output
 *
 * @return
 *   - 0: on success
 *   - <0: on failure.
 */
int
rte_rawdev_dump(uint16_t dev_id, FILE *f);

/**
 * Get an attribute value from implementation.
 * Attribute is an opaque handle agreed upon between application and PMD.
 *
 * Implementations are expected to maintain an array of attribute-value pairs
 * based on application calls. Memory management for this structure is
 * shared responsibility of implementation and application.
 *
 * @param dev_id
 *   The identifier of the device to configure.
 * @param attr_name
 *   Opaque object representing an attribute in implementation.
 * @param attr_value [out]
 *   Opaque response to the attribute value. In case of error, this remains
 *   untouched. This is double pointer of void type.
 * @return
 *   0 for success
 *  !0 Error; attr_value remains untouched in case of error.
 */
int
rte_rawdev_get_attr(uint16_t dev_id,
		    const char *attr_name,
		    uint64_t *attr_value);

/**
 * Set an attribute value.
 * Attribute is an opaque handle agreed upon between application and PMD.
 *
 * @param dev_id
 *   The identifier of the device to configure.
 * @param attr_name
 *   Opaque object representing an attribute in implementation.
 * @param attr_value
 *   Value of the attribute represented by attr_name
 * @return
 *   0 for success
 *  !0 Error
 */
int
rte_rawdev_set_attr(uint16_t dev_id,
		    const char *attr_name,
		    const uint64_t attr_value);

/**
 * Enqueue a stream of buffers to the device.
 *
 * Rather than specifying a queue, this API passes along an opaque object
 * to the driver implementation. That object can be a queue or any other
 * contextual information necessary for the device to enqueue buffers.
 *
 * @param dev_id
 *   The identifier of the device to configure.
 * @param buffers
 *   Collection of buffers for enqueuing
 * @param count
 *   Count of buffers to enqueue
 * @param context
 *   Opaque context information.
 * @return
 *   >=0 for buffers enqueued
 *  !0 for failure.
 *  Whether partial enqueue is failure or success is defined between app
 *  and driver implementation.
 */
int
rte_rawdev_enqueue_buffers(uint16_t dev_id,
			   struct rte_rawdev_buf **buffers,
			   unsigned int count,
			   rte_rawdev_obj_t context);

/**
 * Dequeue a stream of buffers from the device.
 *
 * Rather than specifying a queue, this API passes along an opaque object
 * to the driver implementation. That object can be a queue or any other
 * contextual information necessary for the device to dequeue buffers.
 *
 * Application should have allocated enough space to store `count` response
 * buffers.
 * Releasing buffers dequeued is responsibility of the application.
 *
 * @param dev_id
 *   The identifier of the device to configure.
 * @param buffers
 *   Collection of buffers dequeued
 * @param count
 *   Max buffers expected to be dequeued
 * @param context
 *   Opaque context information.
 * @return
 *   >=0 for buffers dequeued
 *  !0 for failure.
 *  Whether partial enqueue is failure or success is defined between app
 *  and driver implementation.
 */
int
rte_rawdev_dequeue_buffers(uint16_t dev_id,
			   struct rte_rawdev_buf **buffers,
			   unsigned int count,
			   rte_rawdev_obj_t context);

/** Maximum name length for extended statistics counters */
#define RTE_RAW_DEV_XSTATS_NAME_SIZE 64

/**
 * A name-key lookup element for extended statistics.
 *
 * This structure is used to map between names and ID numbers
 * for extended ethdev statistics.
 */
struct rte_rawdev_xstats_name {
	char name[RTE_RAW_DEV_XSTATS_NAME_SIZE];
};

/**
 * Retrieve names of extended statistics of a raw device.
 *
 * @param dev_id
 *   The identifier of the raw device.
 * @param[out] xstats_names
 *   Block of memory to insert names into. Must be at least size in capacity.
 *   If set to NULL, function returns required capacity.
 * @param size
 *   Capacity of xstats_names (number of names).
 * @return
 *   - positive value lower or equal to size: success. The return value
 *     is the number of entries filled in the stats table.
 *   - positive value higher than size: error, the given statistics table
 *     is too small. The return value corresponds to the size that should
 *     be given to succeed. The entries in the table are not valid and
 *     shall not be used by the caller.
 *   - negative value on error:
 *        -ENODEV for invalid *dev_id*
 *        -ENOTSUP if the device doesn't support this function.
 */
int
rte_rawdev_xstats_names_get(uint16_t dev_id,
			    struct rte_rawdev_xstats_name *xstats_names,
			    unsigned int size);

/**
 * Retrieve extended statistics of a raw device.
 *
 * @param dev_id
 *   The identifier of the device.
 * @param ids
 *   The id numbers of the stats to get. The ids can be got from the stat
 *   position in the stat list from rte_rawdev_get_xstats_names(), or
 *   by using rte_rawdev_get_xstats_by_name()
 * @param[out] values
 *   The values for each stats request by ID.
 * @param n
 *   The number of stats requested
 * @return
 *   - positive value: number of stat entries filled into the values array
 *   - negative value on error:
 *        -ENODEV for invalid *dev_id*
 *        -ENOTSUP if the device doesn't support this function.
 */
int
rte_rawdev_xstats_get(uint16_t dev_id,
		      const unsigned int ids[],
		      uint64_t values[],
		      unsigned int n);

/**
 * Retrieve the value of a single stat by requesting it by name.
 *
 * @param dev_id
 *   The identifier of the device
 * @param name
 *   The stat name to retrieve
 * @param[out] id
 *   If non-NULL, the numerical id of the stat will be returned, so that further
 *   requests for the stat can be got using rte_rawdev_xstats_get, which will
 *   be faster as it doesn't need to scan a list of names for the stat.
 *   If the stat cannot be found, the id returned will be (unsigned)-1.
 * @return
 *   - positive value or zero: the stat value
 *   - negative value: -EINVAL if stat not found, -ENOTSUP if not supported.
 */
uint64_t
rte_rawdev_xstats_by_name_get(uint16_t dev_id,
			      const char *name,
			      unsigned int *id);

/**
 * Reset the values of the xstats of the selected component in the device.
 *
 * @param dev_id
 *   The identifier of the device
 * @param ids
 *   Selects specific statistics to be reset. When NULL, all statistics
 *   will be reset. If non-NULL, must point to array of at least
 *   *nb_ids* size.
 * @param nb_ids
 *   The number of ids available from the *ids* array. Ignored when ids is NULL.
 * @return
 *   - zero: successfully reset the statistics to zero
 *   - negative value: -EINVAL invalid parameters, -ENOTSUP if not supported.
 */
int
rte_rawdev_xstats_reset(uint16_t dev_id,
			const uint32_t ids[],
			uint32_t nb_ids);

/**
 * Get Firmware status of the device..
 * Returns a memory allocated by driver/implementation containing status
 * information block. It is responsibility of caller to release the buffer.
 *
 * @param dev_id
 *   Raw device identifier
 * @param status_info
 *   Pointer to status information area. Caller is responsible for releasing
 *   the memory associated.
 * @return
 *   0 for success,
 *  !0 for failure, `status_info` argument state is undefined
 */
int
rte_rawdev_firmware_status_get(uint16_t dev_id,
			       rte_rawdev_obj_t status_info);

/**
 * Get Firmware version of the device.
 * Returns a memory allocated by driver/implementation containing version
 * information block. It is responsibility of caller to release the buffer.
 *
 * @param dev_id
 *   Raw device identifier
 * @param version_info
 *   Pointer to version information area. Caller is responsible for releasing
 *   the memory associated.
 * @return
 *   0 for success,
 *  !0 for failure, `version_info` argument state is undefined
 */
int
rte_rawdev_firmware_version_get(uint16_t dev_id,
				rte_rawdev_obj_t version_info);

/**
 * Load firmware on the device.
 * TODO: In future, methods like directly flashing from file too can be
 * supported.
 *
 * @param dev_id
 *   Raw device identifier
 * @param firmware_image
 *   Pointer to buffer containing image binary data
 * @return
 *   0 for successful load
 *  !0 for failure to load the provided image, or image incorrect.
 */
int
rte_rawdev_firmware_load(uint16_t dev_id, rte_rawdev_obj_t firmware_image);

/**
 * Unload firmware from the device.
 *
 * @param dev_id
 *   Raw device identifiers
 * @return
 *   0 for successful Unload
 *  !0 for failure in unloading
 */
int
rte_rawdev_firmware_unload(uint16_t dev_id);

/**
 * Trigger the rawdev self test.
 *
 * @param dev_id
 *   The identifier of the device
 * @return
 *   - 0: Selftest successful
 *   - -ENOTSUP if the device doesn't support selftest
 *   - other values < 0 on failure.
 */
int
rte_rawdev_selftest(uint16_t dev_id);

#ifdef __cplusplus
}
#endif

#endif /* _RTE_RAWDEV_H_ */