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From: Nipun Gupta <nipun.gupta@nxp.com>
To: <dev@dpdk.org>
CC: <hemant.agrawal@nxp.com>, <jerin.jacob@caviumnetworks.com>,
<harry.van.haaren@intel.com>, <bruce.richardson@intel.com>,
<gage.eads@intel.com>, <shreyansh.jain@nxp.com>, Nipun Gupta
<nipun.gupta@nxp.com>
Date: Wed, 28 Jun 2017 20:46:03 +0530
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Subject: [dpdk-dev] [PATCH 20/21 v3] event/dpaa2: handle timeout using
interrupts in dequeue
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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>
---
drivers/event/dpaa2/dpaa2_eventdev.c | 37 +++++++++++++++++++++++++++++++++---
1 file changed, 34 insertions(+), 3 deletions(-)
diff --git a/drivers/event/dpaa2/dpaa2_eventdev.c b/drivers/event/dpaa2/dpaa2_eventdev.c
index a7f8516..80ee65c 100644
--- a/drivers/event/dpaa2/dpaa2_eventdev.c
+++ b/drivers/event/dpaa2/dpaa2_eventdev.c
@@ -162,6 +162,32 @@
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 @@ static void dpaa2_eventdev_process_atomic(struct qbman_swp *swp,
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 @@ static void dpaa2_eventdev_process_atomic(struct qbman_swp *swp,
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);
--
1.9.1