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eal: add pending interrupt callback unregister

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use case: if callback is used to receive message form socket,
and the message received is disconnect/error, this callback needs
to be unregistered, but cannot because it is still active.

With this patch it is possible to mark the callback to be
unregistered once the interrupt process is done with this
interrupt source.

Signed-off-by: Jakub Grajciar <jgrajcia@cisco.com>
This commit is contained in:
Jakub Grajciar 2019-03-22 12:52:36 +01:00 committed by Thomas Monjalon
parent c0d9052afb
commit 0c7ce182a7
4 changed files with 220 additions and 3 deletions
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32
lib/librte_eal/common/include/rte_interrupts.h
View File

@ -6,6 +6,7 @@
#define _RTE_INTERRUPTS_H_
#include <rte_common.h>
#include <rte_compat.h>
/**
* @file
@ -24,6 +25,13 @@ struct rte_intr_handle;
/** Function to be registered for the specific interrupt */
typedef void (*rte_intr_callback_fn)(void *cb_arg);
/**
* Function to call after a callback is unregistered.
* Can be used to close fd and free cb_arg.
*/
typedef void (*rte_intr_unregister_callback_fn)(struct rte_intr_handle *intr_handle,
void *cb_arg);
#include "rte_eal_interrupts.h"
/**
@ -61,6 +69,30 @@ int rte_intr_callback_register(const struct rte_intr_handle *intr_handle,
int rte_intr_callback_unregister(const struct rte_intr_handle *intr_handle,
rte_intr_callback_fn cb, void *cb_arg);
/**
* Unregister the callback according to the specified interrupt handle,
* after it's no longer active. Fail if source is not active.
*
* @param intr_handle
* pointer to the interrupt handle.
* @param cb_fn
* callback address.
* @param cb_arg
* address of parameter for callback, (void *)-1 means to remove all
* registered which has the same callback address.
* @param ucb_fn
* callback to call before cb is unregistered (optional).
* can be used to close fd and free cb_arg.
*
* @return
* - On success, return the number of callback entities marked for remove.
* - On failure, a negative value.
*/
int __rte_experimental
rte_intr_callback_unregister_pending(const struct rte_intr_handle *intr_handle,
rte_intr_callback_fn cb_fn, void *cb_arg,
rte_intr_unregister_callback_fn ucb_fn);
/**
* It enables the interrupt for the specified handle.
*

105
lib/librte_eal/freebsd/eal/eal_interrupts.c
View File

@ -33,6 +33,8 @@ struct rte_intr_callback {
TAILQ_ENTRY(rte_intr_callback) next;
rte_intr_callback_fn cb_fn; /**< callback address */
void *cb_arg; /**< parameter for callback */
uint8_t pending_delete; /**< delete after callback is called */
rte_intr_unregister_callback_fn ucb_fn; /**< fn to call before cb is deleted */
};
struct rte_intr_source {
@ -104,6 +106,8 @@ rte_intr_callback_register(const struct rte_intr_handle *intr_handle,
}
callback->cb_fn = cb;
callback->cb_arg = cb_arg;
callback->pending_delete = 0;
callback->ucb_fn = NULL;
rte_spinlock_lock(&intr_lock);
@ -189,6 +193,62 @@ fail:
return ret;
}
int __rte_experimental
rte_intr_callback_unregister_pending(const struct rte_intr_handle *intr_handle,
rte_intr_callback_fn cb_fn, void *cb_arg,
rte_intr_unregister_callback_fn ucb_fn)
{
int ret;
struct rte_intr_source *src;
struct rte_intr_callback *cb, *next;
/* do parameter checking first */
if (intr_handle == NULL || intr_handle->fd < 0) {
RTE_LOG(ERR, EAL,
"Unregistering with invalid input parameter\n");
return -EINVAL;
}
if (kq < 0) {
RTE_LOG(ERR, EAL, "Kqueue is not active\n");
return -ENODEV;
}
rte_spinlock_lock(&intr_lock);
/* check if the insterrupt source for the fd is existent */
TAILQ_FOREACH(src, &intr_sources, next)
if (src->intr_handle.fd == intr_handle->fd)
break;
/* No interrupt source registered for the fd */
if (src == NULL) {
ret = -ENOENT;
/* only usable if the source is active */
} else if (src->active == 0) {
ret = -EAGAIN;
} else {
ret = 0;
/* walk through the callbacks and mark all that match. */
for (cb = TAILQ_FIRST(&src->callbacks); cb != NULL; cb = next) {
next = TAILQ_NEXT(cb, next);
if (cb->cb_fn == cb_fn && (cb_arg == (void *)-1 ||
cb->cb_arg == cb_arg)) {
cb->pending_delete = 1;
cb->ucb_fn = ucb_fn;
ret++;
}
}
}
rte_spinlock_unlock(&intr_lock);
return ret;
}
int
rte_intr_callback_unregister(const struct rte_intr_handle *intr_handle,
rte_intr_callback_fn cb_fn, void *cb_arg)
@ -332,10 +392,11 @@ eal_intr_process_interrupts(struct kevent *events, int nfds)
{
struct rte_intr_callback active_cb;
union rte_intr_read_buffer buf;
struct rte_intr_callback *cb;
struct rte_intr_callback *cb, *next;
struct rte_intr_source *src;
bool call = false;
int n, bytes_read;
struct kevent ke;
for (n = 0; n < nfds; n++) {
int event_fd = events[n].ident;
@ -415,6 +476,48 @@ eal_intr_process_interrupts(struct kevent *events, int nfds)
/* we done with that interrupt source, release it. */
src->active = 0;
/* check if any callback are supposed to be removed */
for (cb = TAILQ_FIRST(&src->callbacks); cb != NULL; cb = next) {
next = TAILQ_NEXT(cb, next);
if (cb->pending_delete) {
/* remove it from the kqueue */
memset(&ke, 0, sizeof(ke));
/* mark for deletion from the queue */
ke.flags = EV_DELETE;
if (intr_source_to_kevent(&src->intr_handle, &ke) < 0) {
RTE_LOG(ERR, EAL, "Cannot convert to kevent\n");
rte_spinlock_unlock(&intr_lock);
return;
}
/**
* remove intr file descriptor from wait list.
*/
if (kevent(kq, &ke, 1, NULL, 0, NULL) < 0) {
RTE_LOG(ERR, EAL, "Error removing fd %d kevent, "
"%s\n", src->intr_handle.fd,
strerror(errno));
/* removing non-existent even is an expected
* condition in some circumstances
* (e.g. oneshot events).
*/
}
TAILQ_REMOVE(&src->callbacks, cb, next);
if (cb->ucb_fn)
cb->ucb_fn(&src->intr_handle, cb->cb_arg);
free(cb);
}
}
/* all callbacks for that source are removed. */
if (TAILQ_EMPTY(&src->callbacks)) {
TAILQ_REMOVE(&intr_sources, src, next);
free(src);
}
rte_spinlock_unlock(&intr_lock);
}
}

85
lib/librte_eal/linux/eal/eal_interrupts.c
View File

@ -76,6 +76,8 @@ struct rte_intr_callback {
TAILQ_ENTRY(rte_intr_callback) next;
rte_intr_callback_fn cb_fn; /**< callback address */
void *cb_arg; /**< parameter for callback */
uint8_t pending_delete; /**< delete after callback is called */
rte_intr_unregister_callback_fn ucb_fn; /**< fn to call before cb is deleted */
};
struct rte_intr_source {
@ -472,6 +474,8 @@ rte_intr_callback_register(const struct rte_intr_handle *intr_handle,
}
callback->cb_fn = cb;
callback->cb_arg = cb_arg;
callback->pending_delete = 0;
callback->ucb_fn = NULL;
rte_spinlock_lock(&intr_lock);
@ -518,6 +522,57 @@ rte_intr_callback_register(const struct rte_intr_handle *intr_handle,
return ret;
}
int __rte_experimental
rte_intr_callback_unregister_pending(const struct rte_intr_handle *intr_handle,
rte_intr_callback_fn cb_fn, void *cb_arg,
rte_intr_unregister_callback_fn ucb_fn)
{
int ret;
struct rte_intr_source *src;
struct rte_intr_callback *cb, *next;
/* do parameter checking first */
if (intr_handle == NULL || intr_handle->fd < 0) {
RTE_LOG(ERR, EAL,
"Unregistering with invalid input parameter\n");
return -EINVAL;
}
rte_spinlock_lock(&intr_lock);
/* check if the insterrupt source for the fd is existent */
TAILQ_FOREACH(src, &intr_sources, next)
if (src->intr_handle.fd == intr_handle->fd)
break;
/* No interrupt source registered for the fd */
if (src == NULL) {
ret = -ENOENT;
/* only usable if the source is active */
} else if (src->active == 0) {
ret = -EAGAIN;
} else {
ret = 0;
/* walk through the callbacks and mark all that match. */
for (cb = TAILQ_FIRST(&src->callbacks); cb != NULL; cb = next) {
next = TAILQ_NEXT(cb, next);
if (cb->cb_fn == cb_fn && (cb_arg == (void *)-1 ||
cb->cb_arg == cb_arg)) {
cb->pending_delete = 1;
cb->ucb_fn = ucb_fn;
ret++;
}
}
}
rte_spinlock_unlock(&intr_lock);
return ret;
}
int
rte_intr_callback_unregister(const struct rte_intr_handle *intr_handle,
rte_intr_callback_fn cb_fn, void *cb_arg)
@ -698,7 +753,7 @@ static int
eal_intr_process_interrupts(struct epoll_event *events, int nfds)
{
bool call = false;
int n, bytes_read;
int n, bytes_read, rv;
struct rte_intr_source *src;
struct rte_intr_callback *cb, *next;
union rte_intr_read_buffer buf;
@ -823,9 +878,35 @@ eal_intr_process_interrupts(struct epoll_event *events, int nfds)
rte_spinlock_lock(&intr_lock);
}
}
/* we done with that interrupt source, release it. */
src->active = 0;
rv = 0;
/* check if any callback are supposed to be removed */
for (cb = TAILQ_FIRST(&src->callbacks); cb != NULL; cb = next) {
next = TAILQ_NEXT(cb, next);
if (cb->pending_delete) {
TAILQ_REMOVE(&src->callbacks, cb, next);
if (cb->ucb_fn)
cb->ucb_fn(&src->intr_handle, cb->cb_arg);
free(cb);
rv++;
}
}
/* all callbacks for that source are removed. */
if (TAILQ_EMPTY(&src->callbacks)) {
TAILQ_REMOVE(&intr_sources, src, next);
free(src);
}
/* notify the pipe fd waited by epoll_wait to rebuild the wait list */
if (rv >= 0 && write(intr_pipe.writefd, "1", 1) < 0) {
rte_spinlock_unlock(&intr_lock);
return -EPIPE;
}
rte_spinlock_unlock(&intr_lock);
}

1
lib/librte_eal/rte_eal_version.map
View File

@ -322,6 +322,7 @@ EXPERIMENTAL {
rte_fbarray_is_used;
rte_fbarray_set_free;
rte_fbarray_set_used;
rte_intr_callback_unregister_pending;
rte_log_register_type_and_pick_level;
rte_malloc_dump_heaps;
rte_malloc_heap_create;