DPDK
24.11.0-rc0
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Data Structures | |
struct | rte_event_dma_adapter_op |
struct | rte_event_dma_adapter_conf |
struct | rte_event_dma_adapter_runtime_params |
struct | rte_event_dma_adapter_stats |
Typedefs | |
typedef int(* | rte_event_dma_adapter_conf_cb) (uint8_t id, uint8_t evdev_id, struct rte_event_dma_adapter_conf *conf, void *arg) |
Enumerations | |
enum | rte_event_dma_adapter_mode { RTE_EVENT_DMA_ADAPTER_OP_NEW, RTE_EVENT_DMA_ADAPTER_OP_FORWARD } |
Functions | |
__rte_experimental int | rte_event_dma_adapter_create_ext (uint8_t id, uint8_t evdev_id, rte_event_dma_adapter_conf_cb conf_cb, enum rte_event_dma_adapter_mode mode, void *conf_arg) |
__rte_experimental int | rte_event_dma_adapter_create (uint8_t id, uint8_t evdev_id, struct rte_event_port_conf *port_config, enum rte_event_dma_adapter_mode mode) |
__rte_experimental int | rte_event_dma_adapter_free (uint8_t id) |
__rte_experimental int | rte_event_dma_adapter_event_port_get (uint8_t id, uint8_t *event_port_id) |
__rte_experimental int | rte_event_dma_adapter_vchan_add (uint8_t id, int16_t dmadev_id, uint16_t vchan, const struct rte_event *event) |
__rte_experimental int | rte_event_dma_adapter_vchan_del (uint8_t id, int16_t dmadev_id, uint16_t vchan) |
__rte_experimental int | rte_event_dma_adapter_service_id_get (uint8_t id, uint32_t *service_id) |
__rte_experimental int | rte_event_dma_adapter_start (uint8_t id) |
__rte_experimental int | rte_event_dma_adapter_stop (uint8_t id) |
__rte_experimental int | rte_event_dma_adapter_runtime_params_init (struct rte_event_dma_adapter_runtime_params *params) |
__rte_experimental int | rte_event_dma_adapter_runtime_params_set (uint8_t id, struct rte_event_dma_adapter_runtime_params *params) |
__rte_experimental int | rte_event_dma_adapter_runtime_params_get (uint8_t id, struct rte_event_dma_adapter_runtime_params *params) |
__rte_experimental int | rte_event_dma_adapter_stats_get (uint8_t id, struct rte_event_dma_adapter_stats *stats) |
__rte_experimental int | rte_event_dma_adapter_stats_reset (uint8_t id) |
__rte_experimental uint16_t | rte_event_dma_adapter_enqueue (uint8_t evdev_id, uint8_t port_id, struct rte_event ev[], uint16_t nb_events) |
DMA Event Adapter API.
Eventdev library provides adapters to bridge between various components for providing new event source. The event DMA adapter is one of those adapters which is intended to bridge between event devices and DMA devices.
The DMA adapter adds support to enqueue / dequeue DMA operations to / from event device. The packet flow between DMA device and the event device can be accomplished using both SW and HW based transfer mechanisms. The adapter uses an EAL service core function for SW based packet transfer and uses the eventdev PMD functions to configure HW based packet transfer between the DMA device and the event device.
The application can choose to submit a DMA operation directly to an DMA device or send it to the DMA adapter via eventdev based on RTE_EVENT_DMA_ADAPTER_CAP_INTERNAL_PORT_OP_FWD capability. The first mode is known as the event new (RTE_EVENT_DMA_ADAPTER_OP_NEW) mode and the second as the event forward (RTE_EVENT_DMA_ADAPTER_OP_FORWARD) mode. The choice of mode can be specified while creating the adapter. In the former mode, it is an application responsibility to enable ingress packet ordering. In the latter mode, it is the adapter responsibility to enable the ingress packet ordering.
Working model of RTE_EVENT_DMA_ADAPTER_OP_NEW mode:
+--------------+ +--------------+ | | | DMA stage | | Application |---[2]-->| + enqueue to | | | | dmadev | +--------------+ +--------------+ ^ ^ | | | [3] [6] [1] | | | | +--------------+ | | | | | Event device | | | | | +--------------+ | ^ | | | [5] | | v +--------------+ +--------------+ | | | | | DMA adapter |<--[4]---| dmadev | | | | | +--------------+ +--------------+ [1] Application dequeues events from the previous stage. [2] Application prepares the DMA operations. [3] DMA operations are submitted to dmadev by application. [4] DMA adapter dequeues DMA completions from dmadev. [5] DMA adapter enqueues events to the eventdev. [6] Application dequeues from eventdev for further processing.
In the RTE_EVENT_DMA_ADAPTER_OP_NEW mode, application submits DMA operations directly to DMA device. The DMA adapter then dequeues DMA completions from DMA device and enqueue events to the event device. This mode does not ensure ingress ordering, if the application directly enqueues to dmadev without going through DMA / atomic stage i.e. removing item [1] and [2].
Events dequeued from the adapter will be treated as new events. In this mode, application needs to specify event information (response information) which is needed to enqueue an event after the DMA operation is completed.
Working model of RTE_EVENT_DMA_ADAPTER_OP_FORWARD mode:
+--------------+ +--------------+ --[1]-->| |---[2]-->| Application | | Event device | | in | <--[8]--| |<--[3]---| Ordered stage| +--------------+ +--------------+ ^ | | [4] [7] | | v +----------------+ +--------------+ | |--[5]->| | | DMA adapter | | dmadev | | |<-[6]--| | +----------------+ +--------------+ [1] Events from the previous stage. [2] Application in ordered stage dequeues events from eventdev. [3] Application enqueues DMA operations as events to eventdev. [4] DMA adapter dequeues event from eventdev. [5] DMA adapter submits DMA operations to dmadev (Atomic stage). [6] DMA adapter dequeues DMA completions from dmadev [7] DMA adapter enqueues events to the eventdev [8] Events to the next stage
In the event forward (RTE_EVENT_DMA_ADAPTER_OP_FORWARD) mode, if the HW supports the capability RTE_EVENT_DMA_ADAPTER_CAP_INTERNAL_PORT_OP_FWD, application can directly submit the DMA operations to the dmadev. If not, application retrieves the event port of the DMA adapter through the API, rte_event_DMA_adapter_event_port_get(). Then, links its event queue to this port and starts enqueuing DMA operations as events to the eventdev. The adapter then dequeues the events and submits the DMA operations to the dmadev. After the DMA completions, the adapter enqueues events to the event device.
Application can use this mode, when ingress packet ordering is needed. Events dequeued from the adapter will be treated as forwarded events. In this mode, the application needs to specify the dmadev ID and queue pair ID (request information) needed to enqueue an DMA operation in addition to the event information (response information) needed to enqueue an event after the DMA operation has completed.
The event DMA adapter provides common APIs to configure the packet flow from the DMA device to event devices for both SW and HW based transfers. The DMA event adapter's functions are:
The application creates an instance using rte_event_dma_adapter_create() or rte_event_dma_adapter_create_ext().
dmadev queue pair addition / deletion is done using the rte_event_dma_adapter_vchan_add() / rte_event_dma_adapter_vchan_del() APIs. If HW supports the capability RTE_EVENT_DMA_ADAPTER_CAP_INTERNAL_PORT_VCHAN_EV_BIND, event information must be passed to the add API.
Definition in file rte_event_dma_adapter.h.
typedef int(* rte_event_dma_adapter_conf_cb) (uint8_t id, uint8_t evdev_id, struct rte_event_dma_adapter_conf *conf, void *arg) |
Function type used for adapter configuration callback. The callback is used to fill in members of the struct rte_event_dma_adapter_conf, this callback is invoked when creating a SW service for packet transfer from dmadev vchan to the event device. The SW service is created within the function, rte_event_dma_adapter_vchan_add(), if SW based packet transfers from dmadev vchan to the event device are required.
id | Adapter identifier. |
evdev_id | Event device identifier. |
conf | Structure that needs to be populated by this callback. |
arg | Argument to the callback. This is the same as the conf_arg passed to the rte_event_dma_adapter_create_ext(). |
Definition at line 291 of file rte_event_dma_adapter.h.
DMA event adapter mode
Enumerator | |
---|---|
RTE_EVENT_DMA_ADAPTER_OP_NEW | Start the DMA adapter in event new mode.
Application submits DMA operations to the dmadev. Adapter only dequeues the DMA completions from dmadev and enqueue events to the eventdev. |
RTE_EVENT_DMA_ADAPTER_OP_FORWARD | Start the DMA adapter in event forward mode.
Application submits DMA requests as events to the DMA adapter or DMA device based on RTE_EVENT_DMA_ADAPTER_CAP_INTERNAL_PORT_OP_FWD capability. DMA completions are enqueued back to the eventdev by DMA adapter. |
Definition at line 214 of file rte_event_dma_adapter.h.
__rte_experimental int rte_event_dma_adapter_create_ext | ( | uint8_t | id, |
uint8_t | evdev_id, | ||
rte_event_dma_adapter_conf_cb | conf_cb, | ||
enum rte_event_dma_adapter_mode | mode, | ||
void * | conf_arg | ||
) |
Create a new event DMA adapter with the specified identifier.
id | Adapter identifier. |
evdev_id | Event device identifier. |
conf_cb | Callback function that fills in members of a struct rte_event_dma_adapter_conf struct passed into it. |
mode | Flag to indicate the mode of the adapter. |
conf_arg | Argument that is passed to the conf_cb function. |
__rte_experimental int rte_event_dma_adapter_create | ( | uint8_t | id, |
uint8_t | evdev_id, | ||
struct rte_event_port_conf * | port_config, | ||
enum rte_event_dma_adapter_mode | mode | ||
) |
Create a new event DMA adapter with the specified identifier. This function uses an internal configuration function that creates an event port. This default function reconfigures the event device with an additional event port and set up the event port using the port_config parameter passed into this function. In case the application needs more control in configuration of the service, it should use the rte_event_dma_adapter_create_ext() version.
id | Adapter identifier. |
evdev_id | Event device identifier. |
port_config | Argument of type rte_event_port_conf that is passed to the conf_cb function. |
mode | Flag to indicate the mode of the adapter. |
__rte_experimental int rte_event_dma_adapter_free | ( | uint8_t | id | ) |
Free an event DMA adapter
id | Adapter identifier. |
__rte_experimental int rte_event_dma_adapter_event_port_get | ( | uint8_t | id, |
uint8_t * | event_port_id | ||
) |
Retrieve the event port of an adapter.
id | Adapter identifier. | |
[out] | event_port_id | Application links its event queue to this adapter port which is used in RTE_EVENT_DMA_ADAPTER_OP_FORWARD mode. |
__rte_experimental int rte_event_dma_adapter_vchan_add | ( | uint8_t | id, |
int16_t | dmadev_id, | ||
uint16_t | vchan, | ||
const struct rte_event * | event | ||
) |
Add a vchan to an event DMA adapter.
id | Adapter identifier. |
dmadev_id | dmadev identifier. |
vchan | DMA device vchan identifier. If vchan is set -1, adapter adds all the preconfigured vchan to the instance. |
event | If HW supports dmadev vchan to event queue binding, application is expected to fill in event information, else it will be NULL. |
__rte_experimental int rte_event_dma_adapter_vchan_del | ( | uint8_t | id, |
int16_t | dmadev_id, | ||
uint16_t | vchan | ||
) |
Delete a vchan from an event DMA adapter.
id | Adapter identifier. |
dmadev_id | DMA device identifier. |
vchan | DMA device vchan identifier. |
__rte_experimental int rte_event_dma_adapter_service_id_get | ( | uint8_t | id, |
uint32_t * | service_id | ||
) |
Retrieve the service ID of an adapter. If the adapter doesn't use a rte_service function, this function returns -ESRCH.
id | Adapter identifier. | |
[out] | service_id | A pointer to a uint32_t, to be filled in with the service id. |
__rte_experimental int rte_event_dma_adapter_start | ( | uint8_t | id | ) |
Start event DMA adapter
id | Adapter identifier. |
__rte_experimental int rte_event_dma_adapter_stop | ( | uint8_t | id | ) |
Stop event DMA adapter
id | Adapter identifier. |
__rte_experimental int rte_event_dma_adapter_runtime_params_init | ( | struct rte_event_dma_adapter_runtime_params * | params | ) |
Initialize the adapter runtime configuration parameters
params | A pointer to structure of type struct rte_event_dma_adapter_runtime_params |
__rte_experimental int rte_event_dma_adapter_runtime_params_set | ( | uint8_t | id, |
struct rte_event_dma_adapter_runtime_params * | params | ||
) |
Set the adapter runtime configuration parameters
id | Adapter identifier |
params | A pointer to structure of type struct rte_event_dma_adapter_runtime_params with configuration parameter values. The reserved fields of this structure must be initialized to zero and the valid fields need to be set appropriately. This struct can be initialized using rte_event_dma_adapter_runtime_params_init() API to default values or application may reset this struct and update required fields. |
__rte_experimental int rte_event_dma_adapter_runtime_params_get | ( | uint8_t | id, |
struct rte_event_dma_adapter_runtime_params * | params | ||
) |
Get the adapter runtime configuration parameters
id | Adapter identifier | |
[out] | params | A pointer to structure of type struct rte_event_dma_adapter_runtime_params containing valid adapter parameters when return value is 0. |
__rte_experimental int rte_event_dma_adapter_stats_get | ( | uint8_t | id, |
struct rte_event_dma_adapter_stats * | stats | ||
) |
Retrieve statistics for an adapter
id | Adapter identifier. | |
[out] | stats | A pointer to structure used to retrieve statistics for an adapter. |
__rte_experimental int rte_event_dma_adapter_stats_reset | ( | uint8_t | id | ) |
Reset statistics for an adapter.
id | Adapter identifier. |
__rte_experimental uint16_t rte_event_dma_adapter_enqueue | ( | uint8_t | evdev_id, |
uint8_t | port_id, | ||
struct rte_event | ev[], | ||
uint16_t | nb_events | ||
) |
Enqueue a burst of DMA operations as event objects supplied in rte_event structure on an event DMA adapter designated by its event evdev_id through the event port specified by port_id. This function is supported if the eventdev PMD has the RTE_EVENT_DMA_ADAPTER_CAP_INTERNAL_PORT_OP_FWD capability flag set.
The nb_events parameter is the number of event objects to enqueue that are supplied in the ev array of rte_event structure.
The rte_event_dma_adapter_enqueue() function returns the number of event objects it actually enqueued. A return value equal to nb_events means that all event objects have been enqueued.
evdev_id | The identifier of the device. |
port_id | The identifier of the event port. |
ev | Points to an array of nb_events objects of type rte_event structure which contain the event object enqueue operations to be processed. |
nb_events | The number of event objects to enqueue, typically number of rte_event_port_attr_get(...RTE_EVENT_PORT_ATTR_ENQ_DEPTH...) available for this port. |