event/dpaa2: handle timeout using interrupts in dequeue

This patch adds support for interrupt handling on the event port.
These interrupts facilitates managing of timeout ticks in the
event dequeue functions.

Signed-off-by: Nipun Gupta <nipun.gupta@nxp.com>

diff --git a/drivers/event/dpaa2/dpaa2_eventdev.c b/drivers/event/dpaa2/dpaa2_eventdev.c
index a7f8516..80ee65c 100644 (file)
--- a/drivers/event/dpaa2/dpaa2_eventdev.c
+++ b/drivers/event/dpaa2/dpaa2_eventdev.c
@@ -162,6 +162,32 @@ dpaa2_eventdev_enqueue(void *port, const struct rte_event *ev)
        return dpaa2_eventdev_enqueue_burst(port, ev, 1);
 }
 
+static void dpaa2_eventdev_dequeue_wait(uint64_t timeout_ticks)
+{
+       struct epoll_event epoll_ev;
+       int ret, i = 0;
+
+       qbman_swp_interrupt_clear_status(DPAA2_PER_LCORE_PORTAL,
+                                        QBMAN_SWP_INTERRUPT_DQRI);
+
+RETRY:
+       ret = epoll_wait(DPAA2_PER_LCORE_DPIO->epoll_fd,
+                        &epoll_ev, 1, timeout_ticks);
+       if (ret < 1) {
+               /* sometimes due to some spurious interrupts epoll_wait fails
+                * with errno EINTR. so here we are retrying epoll_wait in such
+                * case to avoid the problem.
+                */
+               if (errno == EINTR) {
+                       PMD_DRV_LOG(DEBUG, PMD, "epoll_wait fails\n");
+                       if (i++ > 10)
+                               PMD_DRV_LOG(DEBUG, PMD,
+                                           "Dequeue burst Failed\n");
+               goto RETRY;
+               }
+       }
+}
+
 static void dpaa2_eventdev_process_parallel(struct qbman_swp *swp,
                                            const struct qbman_fd *fd,
                                            const struct qbman_result *dq,
@@ -204,7 +230,6 @@ dpaa2_eventdev_dequeue_burst(void *port, struct rte_event ev[],
        int num_pkts = 0, ret, i = 0;
 
        RTE_SET_USED(port);
-       RTE_SET_USED(timeout_ticks);
 
        if (unlikely(!DPAA2_PER_LCORE_DPIO)) {
                ret = dpaa2_affine_qbman_swp();
@@ -229,8 +254,14 @@ dpaa2_eventdev_dequeue_burst(void *port, struct rte_event ev[],
 
        do {
                dq = qbman_swp_dqrr_next(swp);
-               if (!dq)
-                       return 0;
+               if (!dq) {
+                       if (!num_pkts && timeout_ticks) {
+                               dpaa2_eventdev_dequeue_wait(timeout_ticks);
+                               timeout_ticks = 0;
+                               continue;
+                       }
+                       return num_pkts;
+               }
 
                fd = qbman_result_DQ_fd(dq);