Function handle_worker_shutdown

dpdk/lib/distributor/rte_distributor.c:287–332

* When worker called rte_distributor_return_pkt() * and passed RTE_DISTRIB_RETURN_BUF handshake through retptr64, * distributor must retrieve both inflight and backlog packets assigned * to the worker and reprocess them to another worker. */

 * to the worker and reprocess them to another worker.
 */
static void
handle_worker_shutdown(struct rte_distributor *d, unsigned int wkr)
{
	struct rte_distributor_buffer *buf = &(d->bufs[wkr]);
	/* double BURST size for storing both inflights and backlog */
	struct rte_mbuf *pkts[RTE_DIST_BURST_SIZE * 2];
	unsigned int pkts_count = 0;
	unsigned int i;

	/* If GET_BUF is cleared there are in-flight packets sent
	 * to worker which does not require new packets.
	 * They must be retrieved and assigned to another worker.
	 */
	if (!(rte_atomic_load_explicit(&(buf->bufptr64[0]), rte_memory_order_acquire)
		& RTE_DISTRIB_GET_BUF))
		for (i = 0; i < RTE_DIST_BURST_SIZE; i++)
			if (buf->bufptr64[i] & RTE_DISTRIB_VALID_BUF)
				pkts[pkts_count++] = (void *)((uintptr_t)
					(buf->bufptr64[i]
						>> RTE_DISTRIB_FLAG_BITS));

	/* Make following operations on handshake flags on bufptr64:
	 * - set GET_BUF to indicate that distributor can overwrite buffer
	 *     with new packets if worker will make a new request.
	 * - clear RETURN_BUF to unlock reads on worker side.
	 */
	rte_atomic_store_explicit(&(buf->bufptr64[0]), RTE_DISTRIB_GET_BUF,
		rte_memory_order_release);

	/* Collect backlog packets from worker */
	for (i = 0; i < d->backlog[wkr].count; i++)
		pkts[pkts_count++] = (void *)((uintptr_t)
			(d->backlog[wkr].pkts[i] >> RTE_DISTRIB_FLAG_BITS));

	d->backlog[wkr].count = 0;

	/* Clear both inflight and backlog tags */
	for (i = 0; i < RTE_DIST_BURST_SIZE; i++) {
		d->in_flight_tags[wkr][i] = 0;
		d->backlog[wkr].tags[i] = 0;
	}

	/* Recursive call */
	if (pkts_count > 0)
		rte_distributor_process(d, pkts, pkts_count);
}


/*