DPDK
21.08.0
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Data Structures | |
struct | rte_event_eth_rx_adapter_conf |
struct | rte_event_eth_rx_adapter_queue_conf |
struct | rte_event_eth_rx_adapter_stats |
struct | rte_event_eth_rx_adapter_vector_limits |
Macros | |
#define | RTE_EVENT_ETH_RX_ADAPTER_QUEUE_FLOW_ID_VALID 0x1 |
#define | RTE_EVENT_ETH_RX_ADAPTER_QUEUE_EVENT_VECTOR 0x2 |
Typedefs | |
typedef int(* | rte_event_eth_rx_adapter_conf_cb) (uint8_t id, uint8_t dev_id, struct rte_event_eth_rx_adapter_conf *conf, void *arg) |
typedef uint16_t(* | rte_event_eth_rx_adapter_cb_fn) (uint16_t eth_dev_id, uint16_t queue_id, uint32_t enqueue_buf_size, uint32_t enqueue_buf_count, struct rte_event *ev, uint16_t nb_event, void *cb_arg, uint16_t *nb_dropped) |
Functions | |
int | rte_event_eth_rx_adapter_create_ext (uint8_t id, uint8_t dev_id, rte_event_eth_rx_adapter_conf_cb conf_cb, void *conf_arg) |
int | rte_event_eth_rx_adapter_create (uint8_t id, uint8_t dev_id, struct rte_event_port_conf *port_config) |
int | rte_event_eth_rx_adapter_free (uint8_t id) |
int | rte_event_eth_rx_adapter_queue_add (uint8_t id, uint16_t eth_dev_id, int32_t rx_queue_id, const struct rte_event_eth_rx_adapter_queue_conf *conf) |
int | rte_event_eth_rx_adapter_queue_del (uint8_t id, uint16_t eth_dev_id, int32_t rx_queue_id) |
int | rte_event_eth_rx_adapter_start (uint8_t id) |
int | rte_event_eth_rx_adapter_stop (uint8_t id) |
int | rte_event_eth_rx_adapter_stats_get (uint8_t id, struct rte_event_eth_rx_adapter_stats *stats) |
int | rte_event_eth_rx_adapter_stats_reset (uint8_t id) |
int | rte_event_eth_rx_adapter_service_id_get (uint8_t id, uint32_t *service_id) |
int | rte_event_eth_rx_adapter_cb_register (uint8_t id, uint16_t eth_dev_id, rte_event_eth_rx_adapter_cb_fn cb_fn, void *cb_arg) |
__rte_experimental int | rte_event_eth_rx_adapter_vector_limits_get (uint8_t dev_id, uint16_t eth_port_id, struct rte_event_eth_rx_adapter_vector_limits *limits) |
__rte_experimental int | rte_event_eth_rx_adapter_queue_event_vector_config (uint8_t id, uint16_t eth_dev_id, int32_t rx_queue_id, struct rte_event_eth_rx_adapter_event_vector_config *config) |
RTE Event Ethernet Rx Adapter
An eventdev-based packet processing application enqueues/dequeues mbufs to/from the event device. Packet flow from the ethernet device to the event device can be accomplished using either HW or SW mechanisms depending on the platform and the particular combination of ethernet and event devices. The event ethernet Rx adapter provides common APIs to configure the packet flow from the ethernet devices to event devices across both these transfer mechanisms.
The adapter uses a EAL service core function for SW based packet transfer and uses the eventdev PMD functions to configure HW based packet transfer between the ethernet device and the event device.
The ethernet Rx event adapter's functions are:
The application creates an ethernet to event adapter using rte_event_eth_rx_adapter_create_ext() or rte_event_eth_rx_adapter_create() functions. The adapter needs to know which ethernet rx queues to poll for mbufs as well as event device parameters such as the event queue identifier, event priority and scheduling type that the adapter should use when constructing events. The rte_event_eth_rx_adapter_queue_add() function is provided for this purpose. The servicing weight parameter in the rte_event_eth_rx_adapter_queue_conf is applicable when the Rx adapter uses a service core function and is intended to provide application control of the frequency of polling ethernet device receive queues, for example, the application may want to poll higher priority queues with a higher frequency but at the same time not starve lower priority queues completely. If this parameter is zero and the receive interrupt is enabled when configuring the device, the receive queue is interrupt driven; else, the queue is assigned a servicing weight of one.
The application can start/stop the adapter using the rte_event_eth_rx_adapter_start() and the rte_event_eth_rx_adapter_stop() functions. If the adapter uses a rte_service function, then the application is also required to assign a core to the service function and control the service core using the rte_service APIs. The rte_event_eth_rx_adapter_service_id_get() function can be used to retrieve the service function ID of the adapter in this case.
For SW based packet transfers, i.e., when the RTE_EVENT_ETH_RX_ADAPTER_CAP_INTERNAL_PORT is not set in the adapter's capabilities flags for a particular ethernet device, the service function temporarily enqueues events to an event buffer before batch enqueuing these to the event device. If the buffer fills up, the service function stops dequeuing packets from the ethernet device. The application may want to monitor the buffer fill level and instruct the service function to selectively buffer events. The application may also use some other criteria to decide which packets should enter the event device even when the event buffer fill level is low or may want to enqueue packets to an internal event port. The rte_event_eth_rx_adapter_cb_register() function allows the application to register a callback that selects which packets are enqueued to the event device by the SW adapter. The callback interface is event based so the callback can also modify the event data if it needs to.
Definition in file rte_event_eth_rx_adapter.h.
#define RTE_EVENT_ETH_RX_ADAPTER_QUEUE_FLOW_ID_VALID 0x1 |
This flag indicates the flow identifier is valid
Definition at line 91 of file rte_event_eth_rx_adapter.h.
#define RTE_EVENT_ETH_RX_ADAPTER_QUEUE_EVENT_VECTOR 0x2 |
This flag indicates that mbufs arriving on the queue need to be vectorized
Definition at line 95 of file rte_event_eth_rx_adapter.h.
typedef int(* rte_event_eth_rx_adapter_conf_cb) (uint8_t id, uint8_t dev_id, struct rte_event_eth_rx_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_eth_rx_adapter_conf, this callback is invoked when creating a SW service for packet transfer from ethdev queues to the event device. The SW service is created within the rte_event_eth_rx_adapter_queue_add() function if SW based packet transfers from ethdev queues to the event device are required.
id | Adapter identifier. | |
dev_id | Event device identifier. | |
[out] | 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_eth_rx_adapter_create_ext(). |
Definition at line 138 of file rte_event_eth_rx_adapter.h.
typedef uint16_t(* rte_event_eth_rx_adapter_cb_fn) (uint16_t eth_dev_id, uint16_t queue_id, uint32_t enqueue_buf_size, uint32_t enqueue_buf_count, struct rte_event *ev, uint16_t nb_event, void *cb_arg, uint16_t *nb_dropped) |
Callback function invoked by the SW adapter before it continues to process events. The callback is passed the size of the enqueue buffer in the SW adapter and the occupancy of the buffer. The callback can use these values to decide which events are enqueued to the event device by the SW adapter. The callback may also enqueue events internally using its own event port. The SW adapter populates the event information based on the Rx queue configuration in the adapter. The callback can modify the this event information for the events to be enqueued by the SW adapter.
The callback return value is the number of events from the beginning of the event array that are to be enqueued by the SW adapter. It is the callback's responsibility to arrange these events at the beginning of the array, if these events are not contiguous in the original array. The nb_dropped parameter is a pointer to the number of events dropped by the callback, this number is used by the adapter to indicate the number of dropped packets as part of its statistics.
eth_dev_id | Port identifier of the Ethernet device. | |
queue_id | Receive queue index. | |
enqueue_buf_size | Total enqueue buffer size. | |
enqueue_buf_count | Event count in enqueue buffer. | |
[in,out] | ev | Event array. |
nb_event | Event array length. | |
cb_arg | Callback argument. | |
[out] | nb_dropped | Packets dropped by callback. |
Definition at line 302 of file rte_event_eth_rx_adapter.h.
int rte_event_eth_rx_adapter_create_ext | ( | uint8_t | id, |
uint8_t | dev_id, | ||
rte_event_eth_rx_adapter_conf_cb | conf_cb, | ||
void * | conf_arg | ||
) |
Create a new ethernet Rx event adapter with the specified identifier.
id | The identifier of the ethernet Rx event adapter. |
dev_id | The identifier of the device to configure. |
conf_cb | Callback function that fills in members of a struct rte_event_eth_rx_adapter_conf struct passed into it. |
conf_arg | Argument that is passed to the conf_cb function. |
int rte_event_eth_rx_adapter_create | ( | uint8_t | id, |
uint8_t | dev_id, | ||
struct rte_event_port_conf * | port_config | ||
) |
Create a new ethernet Rx event 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 setups 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_eth_rx_adapter_create_ext() version.
id | The identifier of the ethernet Rx event adapter. |
dev_id | The identifier of the device to configure. |
port_config | Argument of type rte_event_port_conf that is passed to the conf_cb function. |
int rte_event_eth_rx_adapter_free | ( | uint8_t | id | ) |
Free an event adapter
id | Adapter identifier. |
int rte_event_eth_rx_adapter_queue_add | ( | uint8_t | id, |
uint16_t | eth_dev_id, | ||
int32_t | rx_queue_id, | ||
const struct rte_event_eth_rx_adapter_queue_conf * | conf | ||
) |
Add receive queue to an event adapter. After a queue has been added to the event adapter, the result of the application calling rte_eth_rx_burst(eth_dev_id, rx_queue_id, ..) is undefined.
id | Adapter identifier. |
eth_dev_id | Port identifier of Ethernet device. |
rx_queue_id | Ethernet device receive queue index. If rx_queue_id is -1, then all Rx queues configured for the device are added. If the ethdev Rx queues can only be connected to a single event queue then rx_queue_id is required to be -1. |
conf | Additional configuration structure of type rte_event_eth_rx_adapter_conf |
int rte_event_eth_rx_adapter_queue_del | ( | uint8_t | id, |
uint16_t | eth_dev_id, | ||
int32_t | rx_queue_id | ||
) |
Delete receive queue from an event adapter.
id | Adapter identifier. |
eth_dev_id | Port identifier of Ethernet device. |
rx_queue_id | Ethernet device receive queue index. If rx_queue_id is -1, then all Rx queues configured for the device are deleted. If the ethdev Rx queues can only be connected to a single event queue then rx_queue_id is required to be -1. |
int rte_event_eth_rx_adapter_start | ( | uint8_t | id | ) |
Start ethernet Rx event adapter
id | Adapter identifier. |
int rte_event_eth_rx_adapter_stop | ( | uint8_t | id | ) |
Stop ethernet Rx event adapter
id | Adapter identifier. |
int rte_event_eth_rx_adapter_stats_get | ( | uint8_t | id, |
struct rte_event_eth_rx_adapter_stats * | stats | ||
) |
Retrieve statistics for an adapter
id | Adapter identifier. | |
[out] | stats | A pointer to structure used to retrieve statistics for an adapter. |
int rte_event_eth_rx_adapter_stats_reset | ( | uint8_t | id | ) |
Reset statistics for an adapter.
id | Adapter identifier. |
int rte_event_eth_rx_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. |
int rte_event_eth_rx_adapter_cb_register | ( | uint8_t | id, |
uint16_t | eth_dev_id, | ||
rte_event_eth_rx_adapter_cb_fn | cb_fn, | ||
void * | cb_arg | ||
) |
Register callback to process Rx packets, this is supported for SW based packet transfers.
id | Adapter identifier. |
eth_dev_id | Port identifier of Ethernet device. |
cb_fn | Callback function. |
cb_arg | Callback arg. |
__rte_experimental int rte_event_eth_rx_adapter_vector_limits_get | ( | uint8_t | dev_id, |
uint16_t | eth_port_id, | ||
struct rte_event_eth_rx_adapter_vector_limits * | limits | ||
) |
Retrieve vector limits for a given event dev and eth dev pair.
dev_id | Event device identifier. | |
eth_port_id | Port identifier of the ethernet device. | |
[out] | limits | A pointer to rte_event_eth_rx_adapter_vector_limits structure that has to be filled. |
__rte_experimental int rte_event_eth_rx_adapter_queue_event_vector_config | ( | uint8_t | id, |
uint16_t | eth_dev_id, | ||
int32_t | rx_queue_id, | ||
struct rte_event_eth_rx_adapter_event_vector_config * | config | ||
) |
Configure event vectorization for a given ethernet device queue, that has been added to a event eth Rx adapter.
id | The identifier of the ethernet Rx event adapter. |
eth_dev_id | The identifier of the ethernet device. |
rx_queue_id | Ethernet device receive queue index. If rx_queue_id is -1, then all Rx queues configured for the ethernet device are configured with event vectorization. |
config | Event vector configuration structure. |