Function rte_eth_dev_callback_unregister

dpdk/lib/ethdev/rte_ethdev.c:5489–5552

}

int
rte_eth_dev_callback_unregister(uint16_t port_id,
			enum rte_eth_event_type event,
			rte_eth_dev_cb_fn cb_fn, void *cb_arg)
{
	int ret;
	struct rte_eth_dev *dev;
	struct rte_eth_dev_callback *cb, *next;
	uint16_t next_port;
	uint16_t last_port;

	if (cb_fn == NULL) {
		RTE_ETHDEV_LOG(ERR,
			"Cannot unregister ethdev port %u callback from NULL\n",
			port_id);
		return -EINVAL;
	}

	if (!rte_eth_dev_is_valid_port(port_id) && port_id != RTE_ETH_ALL) {
		RTE_ETHDEV_LOG(ERR, "Invalid port_id=%d\n", port_id);
		return -EINVAL;
	}

	if (port_id == RTE_ETH_ALL) {
		next_port = 0;
		last_port = RTE_MAX_ETHPORTS - 1;
	} else {
		next_port = last_port = port_id;
	}

	rte_spinlock_lock(&eth_dev_cb_lock);

	do {
		dev = &rte_eth_devices[next_port];
		ret = 0;
		for (cb = TAILQ_FIRST(&dev->link_intr_cbs); cb != NULL;
		     cb = next) {

			next = TAILQ_NEXT(cb, next);

			if (cb->cb_fn != cb_fn || cb->event != event ||
			    (cb_arg != (void *)-1 && cb->cb_arg != cb_arg))
				continue;

			/*
			 * if this callback is not executing right now,
			 * then remove it.
			 */
			if (cb->active == 0) {
				TAILQ_REMOVE(&(dev->link_intr_cbs), cb, next);
				rte_free(cb);
			} else {
				ret = -EAGAIN;
			}
		}
	} while (++next_port <= last_port);

	rte_spinlock_unlock(&eth_dev_cb_lock);