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rte_eal.h(3) DPDK rte_eal.h(3)

NAME

rte_eal.h

SYNOPSIS

#include <stdint.h>
#include <time.h>
#include <rte_config.h>
#include <rte_compat.h>
#include <rte_per_lcore.h>
#include <rte_uuid.h>
#include <rte_pci_dev_feature_defs.h>

Macros


#define RTE_MAGIC 19820526

Typedefs


typedef int(* rte_mp_t) (const struct rte_mp_msg *msg, const void *peer)
typedef int(* rte_mp_async_reply_t) (const struct rte_mp_msg *request, const struct rte_mp_reply *reply)
typedef void(* rte_usage_hook_t) (const char *prgname)

Enumerations


enum rte_proc_type_t
enum rte_iova_mode

Functions


enum rte_proc_type_t rte_eal_process_type (void)
int rte_eal_iopl_init (void)
int rte_eal_init (int argc, char **argv)
int rte_eal_cleanup (void)
int rte_eal_primary_proc_alive (const char *config_file_path)
bool rte_mp_disable (void)
int rte_mp_action_register (const char *name, rte_mp_t action)
void rte_mp_action_unregister (const char *name)
int rte_mp_sendmsg (struct rte_mp_msg *msg)
int rte_mp_request_sync (struct rte_mp_msg *req, struct rte_mp_reply *reply, const struct timespec *ts)
int rte_mp_request_async (struct rte_mp_msg *req, const struct timespec *ts, rte_mp_async_reply_t clb)
int rte_mp_reply (struct rte_mp_msg *msg, const char *peer)
rte_usage_hook_t rte_set_application_usage_hook (rte_usage_hook_t usage_func)
int rte_eal_has_hugepages (void)
int rte_eal_has_pci (void)
int rte_eal_create_uio_dev (void)
enum rte_intr_mode rte_eal_vfio_intr_mode (void)
void rte_eal_vfio_get_vf_token (rte_uuid_t vf_token)
int rte_sys_gettid (void)
static int rte_gettid (void)
__rte_internal uint64_t rte_eal_get_baseaddr (void)
enum rte_iova_mode rte_eal_iova_mode (void)
const char * rte_eal_mbuf_user_pool_ops (void)
const char * rte_eal_get_runtime_dir (void)
__rte_internal int rte_eal_parse_coremask (const char *coremask, int *cores)

Detailed Description

EAL Configuration API

Definition in file rte_eal.h.

Macro Definition Documentation

#define RTE_MAGIC 19820526

Magic number written by the main partition when ready.

Definition at line 28 of file rte_eal.h.

Typedef Documentation

typedef int(* rte_mp_t) (const struct rte_mp_msg *msg, const void *peer)

Action function typedef used by other components.

As we create socket channel for primary/secondary communication, use this function typedef to register action for coming messages.

Note

When handling IPC request callbacks, the reply must be sent even in cases of error handling. Simply returning success or failure will not send a response to the requestor. Implementation of error signalling mechanism is up to the application.

No memory allocations should take place inside the callback.

Definition at line 188 of file rte_eal.h.

typedef int(* rte_mp_async_reply_t) (const struct rte_mp_msg *request, const struct rte_mp_reply *reply)

Asynchronous reply function typedef used by other components.

As we create socket channel for primary/secondary communication, use this function typedef to register action for coming responses to asynchronous requests.

Note

When handling IPC request callbacks, the reply must be sent even in cases of error handling. Simply returning success or failure will not send a response to the requestor. Implementation of error signalling mechanism is up to the application.

No memory allocations should take place inside the callback.

Definition at line 204 of file rte_eal.h.

typedef void(* rte_usage_hook_t) (const char *prgname)

Usage function typedef used by the application usage function.

Use this function typedef to define and call rte_set_application_usage_hook() routine.

Definition at line 350 of file rte_eal.h.

Enumeration Type Documentation

enum rte_proc_type_t

The type of process in a linux, multi-process setup

Definition at line 33 of file rte_eal.h.

enum rte_iova_mode

IOVA mapping mode.

IOVA mapping mode is iommu programming mode of a device. That device (for example: IOMMU backed DMA device) based on rte_iova_mode will generate physical or virtual address.

Definition at line 461 of file rte_eal.h.

Function Documentation

enum rte_proc_type_t rte_eal_process_type (void)

Get the process type in a multi-process setup

Returns

The process type

int rte_eal_iopl_init (void)

Request iopl privilege for all RPL.

This function should be called by pmds which need access to ioports.

Returns

  • On success, returns 0.
  • On failure, returns -1.

int rte_eal_init (int argc, char ** argv)

Initialize the Environment Abstraction Layer (EAL).

This function is to be executed on the MAIN lcore only, as soon as possible in the application's main() function. It puts the WORKER lcores in the WAIT state.

Parameters

argc A non-negative value. If it is greater than 0, the array members for argv[0] through argv[argc] (non-inclusive) shall contain pointers to strings.
argv An array of strings. The contents of the array, as well as the strings which are pointed to by the array, may be modified by this function. The program name pointer argv[0] is copied into the last parsed argv so that argv[0] is still the same after deducing the parsed arguments.

Returns

  • On success, the number of parsed arguments, which is greater or equal to zero. After the call to rte_eal_init(), all arguments argv[x] with x < ret may have been modified by this function call and should not be further interpreted by the application. The EAL does not take any ownership of the memory used for either the argv array, or its members.
  • On failure, -1 and rte_errno is set to a value indicating the cause for failure. In some instances, the application will need to be restarted as part of clearing the issue.

Error codes returned via rte_errno: EACCES indicates a permissions issue.

EAGAIN indicates either a bus or system resource was not available, setup may be attempted again.

EALREADY indicates that the rte_eal_init function has already been called, and cannot be called again.

EFAULT indicates the tailq configuration name was not found in memory configuration.

EINVAL indicates invalid parameters were passed as argv/argc.

ENOMEM indicates failure likely caused by an out-of-memory condition.

ENODEV indicates memory setup issues.

ENOTSUP indicates that the EAL cannot initialize on this system.

EPROTO indicates that the PCI bus is either not present, or is not readable by the eal.

ENOEXEC indicates that a service core failed to launch successfully.

int rte_eal_cleanup (void)

Clean up the Environment Abstraction Layer (EAL)

This function must be called to release any internal resources that EAL has allocated during rte_eal_init(). After this call, no DPDK function calls may be made. It is expected that common usage of this function is to call it just before terminating the process.

Returns

  • 0 Successfully released all internal EAL resources.
  • -EFAULT There was an error in releasing all resources.

int rte_eal_primary_proc_alive (const char * config_file_path)

Check if a primary process is currently alive

This function returns true when a primary process is currently active.

Parameters

config_file_path The config_file_path argument provided should point at the location that the primary process will create its config file. If NULL, the default config file path is used.

Returns

  • If alive, returns 1.
  • If dead, returns 0.

bool rte_mp_disable (void)

Disable multiprocess.

This function can be called to indicate that multiprocess won't be used for the rest of the application life.

Returns

  • true if called from a primary process that had no secondary processes attached,
  • false, otherwise.

int rte_mp_action_register (const char * name, rte_mp_t action)

Register an action function for primary/secondary communication.

Call this function to register an action, if the calling component wants to response the messages from the corresponding component in its primary process or secondary processes.

Note

IPC may be unsupported in certain circumstances, so caller should check for ENOTSUP error.

Parameters

name The name argument plays as the nonredundant key to find the action.
action The action argument is the function pointer to the action function.

Returns

  • 0 on success.
  • (<0) on failure.

void rte_mp_action_unregister (const char * name)

Unregister an action function for primary/secondary communication.

Call this function to unregister an action if the calling component does not want to response the messages from the corresponding component in its primary process or secondary processes.

Note

IPC may be unsupported in certain circumstances, so caller should check for ENOTSUP error.

Parameters

name The name argument plays as the nonredundant key to find the action.

int rte_mp_sendmsg (struct rte_mp_msg * msg)

Send a message to the peer process.

This function will send a message which will be responded by the action identified by name in the peer process.

Parameters

msg The msg argument contains the customized message.

Returns

  • On success, return 0.
  • On failure, return -1, and the reason will be stored in rte_errno.

int rte_mp_request_sync (struct rte_mp_msg * req, struct rte_mp_reply * reply, const struct timespec * ts)

Send a request to the peer process and expect a reply.

This function sends a request message to the peer process, and will block until receiving reply message from the peer process.

Note

The caller is responsible to free reply->replies.

This API must not be used inside memory-related or IPC callbacks, and no memory allocations should take place inside such callback.

IPC may be unsupported in certain circumstances, so caller should check for ENOTSUP error.

Parameters

req The req argument contains the customized request message.
reply The reply argument will be for storing all the replied messages; the caller is responsible for free reply->msgs.
ts The ts argument specifies how long we can wait for the peer(s) to reply.

Returns

  • On success, return 0.
  • On failure, return -1, and the reason will be stored in rte_errno.

int rte_mp_request_async (struct rte_mp_msg * req, const struct timespec * ts, rte_mp_async_reply_t clb)

Send a request to the peer process and expect a reply in a separate callback.

This function sends a request message to the peer process, and will not block. Instead, reply will be received in a separate callback.

Note

IPC may be unsupported in certain circumstances, so caller should check for ENOTSUP error.

Parameters

req The req argument contains the customized request message.
ts The ts argument specifies how long we can wait for the peer(s) to reply.
clb The callback to trigger when all responses for this request have arrived.

Returns

  • On success, return 0.
  • On failure, return -1, and the reason will be stored in rte_errno.

int rte_mp_reply (struct rte_mp_msg * msg, const char * peer)

Send a reply to the peer process.

This function will send a reply message in response to a request message received previously.

Note

When handling IPC request callbacks, the reply must be sent even in cases of error handling. Simply returning success or failure will not send a response to the requestor. Implementation of error signalling mechanism is up to the application.

Parameters

msg The msg argument contains the customized message.
peer The peer argument is the pointer to the peer socket path.

Returns

  • On success, return 0.
  • On failure, return -1, and the reason will be stored in rte_errno.

rte_usage_hook_t rte_set_application_usage_hook (rte_usage_hook_t usage_func)

Add application usage routine callout from the eal_usage() routine.

This function allows the application to include its usage message in the EAL system usage message. The routine rte_set_application_usage_hook() needs to be called before the rte_eal_init() routine in the application.

This routine is optional for the application and will behave as if the set routine was never called as the default behavior.

Parameters

usage_func The func argument is a function pointer to the application usage routine. Called function is defined using rte_usage_hook_t typedef, which is of the form void rte_usage_func(const char * prgname).

Calling this routine with a NULL value will reset the usage hook routine and return the current value, which could be NULL.

Returns

•
Returns the current value of the rte_application_usage pointer to allow the caller to daisy chain the usage routines if needing more then one.

int rte_eal_has_hugepages (void)

Whether EAL is using huge pages (disabled by --no-huge option). The no-huge mode is not compatible with all drivers or features.

Returns

Nonzero if hugepages are enabled.

int rte_eal_has_pci (void)

Whether EAL is using PCI bus. Disabled by --no-pci option.

Returns

Nonzero if the PCI bus is enabled.

int rte_eal_create_uio_dev (void)

Whether the EAL was asked to create UIO device.

Returns

Nonzero if true.

enum rte_intr_mode rte_eal_vfio_intr_mode (void)

The user-configured vfio interrupt mode.

Returns

Interrupt mode configured with the command line, RTE_INTR_MODE_NONE by default.

void rte_eal_vfio_get_vf_token (rte_uuid_t vf_token)

Copy the user-configured vfio VF token.

Parameters

vf_token vfio VF token configured with the command line is copied into this parameter, zero uuid by default.

int rte_sys_gettid (void)

A wrap API for syscall gettid.

Returns

On success, returns the thread ID of calling process. It is always successful.

static int rte_gettid (void) [inline], [static]

Get system unique thread id.

Returns

On success, returns the thread ID of calling process. It is always successful.

Definition at line 438 of file rte_eal.h.

__rte_internal uint64_t rte_eal_get_baseaddr (void)

Get the OS-specific EAL base address.

Returns

The base address.

enum rte_iova_mode rte_eal_iova_mode (void)

Get the iova mode

Returns

enum rte_iova_mode value.

const char* rte_eal_mbuf_user_pool_ops (void)

Get user provided pool ops name for mbuf

Returns

returns user provided pool ops name.

const char* rte_eal_get_runtime_dir (void)

Get the runtime directory of DPDK

Returns

The runtime directory path of DPDK

__rte_internal int rte_eal_parse_coremask (const char * coremask, int * cores)

Convert a string describing a mask of core ids into an array of core ids.

On success, the passed array is filled with the orders of the core ids present in the mask (-1 indicating that a core id is absent). For example, passing a 0xa coremask results in cores[1] = 0, cores[3] = 1, and the rest of the array is set to -1.

Parameters

coremask A string describing a mask of core ids.
cores An array where to store the core ids orders. This array must be at least RTE_MAX_LCORE large.

Returns

0 on success, -1 if the string content was invalid.

Author

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Fri Dec 15 2023 Version 23.11.0