FD.io VPP  v20.01-rc1
Vector Packet Processing
queue.h File Reference
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Typedefs

typedef struct _svm_queue svm_queue_t
 
typedef svm_queue_t unix_shared_memory_queue_t
 

Enumerations

enum  svm_q_conditional_wait_t { SVM_Q_WAIT = 0, SVM_Q_NOWAIT, SVM_Q_TIMEDWAIT }
 

Functions

svm_queue_tsvm_queue_alloc_and_init (int nels, int elsize, int consumer_pid)
 Allocate and initialize svm queue. More...
 
svm_queue_tsvm_queue_init (void *base, int nels, int elsize)
 
void svm_queue_free (svm_queue_t *q)
 
int svm_queue_add (svm_queue_t *q, u8 *elem, int nowait)
 
int svm_queue_add2 (svm_queue_t *q, u8 *elem, u8 *elem2, int nowait)
 
int svm_queue_sub (svm_queue_t *q, u8 *elem, svm_q_conditional_wait_t cond, u32 time)
 
int svm_queue_sub2 (svm_queue_t *q, u8 *elem)
 
void svm_queue_lock (svm_queue_t *q)
 
void svm_queue_send_signal (svm_queue_t *q, u8 is_prod)
 
void svm_queue_unlock (svm_queue_t *q)
 
int svm_queue_is_full (svm_queue_t *q)
 
int svm_queue_add_nolock (svm_queue_t *q, u8 *elem)
 
int svm_queue_sub_raw (svm_queue_t *q, u8 *elem)
 
void svm_queue_wait (svm_queue_t *q)
 Wait for queue event. More...
 
int svm_queue_timedwait (svm_queue_t *q, double timeout)
 Timed wait for queue event. More...
 
void svm_queue_add_raw (svm_queue_t *q, u8 *elem)
 Add element to queue with mutex held. More...
 
void svm_queue_set_producer_event_fd (svm_queue_t *q, int fd)
 Set producer's event fd. More...
 
void svm_queue_set_consumer_event_fd (svm_queue_t *q, int fd)
 Set consumer's event fd. More...
 

Typedef Documentation

◆ svm_queue_t

typedef struct _svm_queue svm_queue_t

◆ unix_shared_memory_queue_t

Definition at line 133 of file queue.h.

Enumeration Type Documentation

◆ svm_q_conditional_wait_t

Enumerator
SVM_Q_WAIT 

blocking call - best used in combination with condvars, for eventfds we don't yield the cpu

SVM_Q_NOWAIT 

non-blocking call - works with both condvar and eventfd signaling

SVM_Q_TIMEDWAIT 

blocking call, returns on signal or time-out - best used in combination with condvars, with eventfds we don't yield the cpu

Definition at line 40 of file queue.h.

Function Documentation

◆ svm_queue_add()

int svm_queue_add ( svm_queue_t q,
u8 elem,
int  nowait 
)

Definition at line 247 of file queue.c.

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◆ svm_queue_add2()

int svm_queue_add2 ( svm_queue_t q,
u8 elem,
u8 elem2,
int  nowait 
)

Definition at line 297 of file queue.c.

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◆ svm_queue_add_nolock()

int svm_queue_add_nolock ( svm_queue_t q,
u8 elem 
)

Definition at line 200 of file queue.c.

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◆ svm_queue_add_raw()

void svm_queue_add_raw ( svm_queue_t q,
u8 elem 
)

Add element to queue with mutex held.

Parameters
qqueue
elempointer element data to add

Definition at line 228 of file queue.c.

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◆ svm_queue_alloc_and_init()

svm_queue_t* svm_queue_alloc_and_init ( int  nels,
int  elsize,
int  consumer_pid 
)

Allocate and initialize svm queue.

Parameters
nelsnumber of elements on the queue
elsizeelement size, presumably 4 and cacheline-size will be popular choices.
pidconsumer pid
Returns
a newly initialized svm queue

The idea is to call this function in the queue consumer, and e-mail the queue pointer to the producer(s).

The vpp process / main thread allocates one of these at startup; its main input queue. The vpp main input queue has a pointer to it in the shared memory segment header.

You probably want to be on an svm data heap before calling this function.

Definition at line 72 of file queue.c.

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◆ svm_queue_free()

void svm_queue_free ( svm_queue_t q)

Definition at line 89 of file queue.c.

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◆ svm_queue_init()

svm_queue_t* svm_queue_init ( void *  base,
int  nels,
int  elsize 
)

Definition at line 33 of file queue.c.

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◆ svm_queue_is_full()

int svm_queue_is_full ( svm_queue_t q)

Definition at line 109 of file queue.c.

◆ svm_queue_lock()

void svm_queue_lock ( svm_queue_t q)

Definition at line 97 of file queue.c.

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◆ svm_queue_send_signal()

void svm_queue_send_signal ( svm_queue_t q,
u8  is_prod 
)

Definition at line 134 of file queue.c.

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◆ svm_queue_set_consumer_event_fd()

void svm_queue_set_consumer_event_fd ( svm_queue_t q,
int  fd 
)

Set consumer's event fd.

When the consumer must generate an event it writes 1 to the provided fd. Although in practice the two fds point to the same underlying file description, because the producer and consumer are different processes the descriptors will be different. It's the caller's responsibility to ensure the file descriptors are properly exchanged between the two peers.

Definition at line 483 of file queue.c.

◆ svm_queue_set_producer_event_fd()

void svm_queue_set_producer_event_fd ( svm_queue_t q,
int  fd 
)

Set producer's event fd.

When the producer must generate an event it writes 1 to the provided fd. Once this is set, condvars are not used anymore for signaling.

Definition at line 477 of file queue.c.

◆ svm_queue_sub()

int svm_queue_sub ( svm_queue_t q,
u8 elem,
svm_q_conditional_wait_t  cond,
u32  time 
)

Definition at line 356 of file queue.c.

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◆ svm_queue_sub2()

int svm_queue_sub2 ( svm_queue_t q,
u8 elem 
)

Definition at line 421 of file queue.c.

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◆ svm_queue_sub_raw()

int svm_queue_sub_raw ( svm_queue_t q,
u8 elem 
)

Definition at line 451 of file queue.c.

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◆ svm_queue_timedwait()

int svm_queue_timedwait ( svm_queue_t q,
double  timeout 
)

Timed wait for queue event.

Must be called with mutex held.

Parameters
qsvm queue
timeouttime in seconds
Returns
0 on success, ETIMEDOUT on timeout or an error

Definition at line 191 of file queue.c.

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◆ svm_queue_unlock()

void svm_queue_unlock ( svm_queue_t q)

Definition at line 103 of file queue.c.

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◆ svm_queue_wait()

void svm_queue_wait ( svm_queue_t q)

Wait for queue event.

Must be called with mutex held.

Definition at line 159 of file queue.c.

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