[PATCH] net/failsafe: fix interrupt handle leak

[David Marchand <david.marchand@redhat.com>]

A intr_handle is being allocated as a hack to get a (proxy) eventfd from
the Linux interrupt implementation.
But this handle is never freed.

Remove this convoluted hack and create an eventfd in Linux case.

Fixes: d61138d4f0e2 ("drivers: remove direct access to interrupt handle")
Cc: stable@dpdk.org

Signed-off-by: David Marchand <david.marchand@redhat.com>
---
 drivers/net/failsafe/failsafe_ops.c | 32 ++++++++++-------------------
 1 file changed, 11 insertions(+), 21 deletions(-)

diff --git a/drivers/net/failsafe/failsafe_ops.c b/drivers/net/failsafe/failsafe_ops.c
index 55e21d635c..2c23d0e70a 100644
--- a/drivers/net/failsafe/failsafe_ops.c
+++ b/drivers/net/failsafe/failsafe_ops.c
@@ -6,6 +6,9 @@
 #include <stdbool.h>
 #include <stdint.h>
 #include <unistd.h>
+#ifdef RTE_EXEC_ENV_LINUX
+#include <sys/eventfd.h>
+#endif
 
 #include <rte_debug.h>
 #include <rte_atomic.h>
@@ -387,28 +390,11 @@ fs_rx_queue_setup(struct rte_eth_dev *dev,
 		const struct rte_eth_rxconf *rx_conf,
 		struct rte_mempool *mb_pool)
 {
-	/*
-	 * FIXME: Add a proper interface in rte_eal_interrupts for
-	 * allocating eventfd as an interrupt vector.
-	 * For the time being, fake as if we are using MSIX interrupts,
-	 * this will cause rte_intr_efd_enable to allocate an eventfd for us.
-	 */
-	struct rte_intr_handle *intr_handle;
 	struct sub_device *sdev;
 	struct rxq *rxq;
 	uint8_t i;
 	int ret;
 
-	intr_handle = rte_intr_instance_alloc(RTE_INTR_INSTANCE_F_PRIVATE);
-	if (intr_handle == NULL)
-		return -ENOMEM;
-
-	if (rte_intr_type_set(intr_handle, RTE_INTR_HANDLE_VFIO_MSIX))
-		return -rte_errno;
-
-	if (rte_intr_efds_index_set(intr_handle, 0, -1))
-		return -rte_errno;
-
 	fs_lock(dev, 0);
 	if (rx_conf->rx_deferred_start) {
 		FOREACH_SUBDEV_STATE(sdev, i, dev, DEV_PROBED) {
@@ -442,12 +428,16 @@ fs_rx_queue_setup(struct rte_eth_dev *dev,
 	rxq->info.nb_desc = nb_rx_desc;
 	rxq->priv = PRIV(dev);
 	rxq->sdev = PRIV(dev)->subs;
-	ret = rte_intr_efd_enable(intr_handle, 1);
-	if (ret < 0) {
+#ifdef RTE_EXEC_ENV_LINUX
+	rxq->event_fd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
+	if (rxq->event_fd < 0) {
+		ERROR("Failed to create an eventfd: %s", strerror(errno));
 		fs_unlock(dev, 0);
-		return ret;
+		return -errno;
 	}
-	rxq->event_fd = rte_intr_efds_index_get(intr_handle, 0);
+#else
+	rxq->event_fd = -1;
+#endif
 	dev->data->rx_queues[rx_queue_id] = rxq;
 	FOREACH_SUBDEV_STATE(sdev, i, dev, DEV_ACTIVE) {
 		ret = rte_eth_rx_queue_setup(PORT_ID(sdev),
-- 
2.23.0