[dpdk-dev] [PATCH v2] net/tap: release port upon close

[wangyunjian]

From: Yunjian Wang <wangyunjian at huawei.com>

Set RTE_ETH_DEV_CLOSE_REMOVE upon probe so all the private
resources for the port can be freed by rte_eth_dev_close().

Signed-off-by: Yunjian Wang <wangyunjian at huawei.com>
---
v2:
   Remove redundant check and assignment suggested
   by Ferruh Yigit and Thomas Monjalon
---
 drivers/net/tap/rte_eth_tap.c | 43 +++++++++++++++++++----------------
 1 file changed, 23 insertions(+), 20 deletions(-)

diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
index 339f24bf8..3844994a3 100644
--- a/drivers/net/tap/rte_eth_tap.c
+++ b/drivers/net/tap/rte_eth_tap.c
@@ -72,6 +72,10 @@
 
 static int tap_devices_count;
 
+static const char *tuntap_types[ETH_TUNTAP_TYPE_MAX] = {
+	"UNKNOWN", "TUN", "TAP"
+};
+
 static const char *valid_arguments[] = {
 	ETH_TAP_IFACE_ARG,
 	ETH_TAP_REMOTE_ARG,
@@ -1074,6 +1078,23 @@ tap_dev_close(struct rte_eth_dev *dev)
 		close(internals->ka_fd);
 		internals->ka_fd = -1;
 	}
+
+	/* mac_addrs must not be freed alone because part of dev_private */
+	dev->data->mac_addrs = NULL;
+
+	internals = dev->data->dev_private;
+	TAP_LOG(DEBUG, "Closing %s Ethernet device on numa %u",
+		tuntap_types[internals->type], rte_socket_id());
+
+	if (internals->ioctl_sock != -1) {
+		close(internals->ioctl_sock);
+		internals->ioctl_sock = -1;
+	}
+	rte_free(dev->process_private);
+	dev->process_private = NULL;
+	if (tap_devices_count == 1)
+		rte_mp_action_unregister(TAP_MP_KEY);
+	tap_devices_count--;
 	/*
 	 * Since TUN device has no more opened file descriptors
 	 * it will be removed from kernel
@@ -1800,10 +1821,6 @@ static const struct eth_dev_ops ops = {
 	.filter_ctrl            = tap_dev_filter_ctrl,
 };
 
-static const char *tuntap_types[ETH_TUNTAP_TYPE_MAX] = {
-	"UNKNOWN", "TUN", "TAP"
-};
-
 static int
 eth_dev_tap_create(struct rte_vdev_device *vdev, const char *tap_name,
 		   char *remote_iface, struct rte_ether_addr *mac_addr,
@@ -1854,7 +1871,7 @@ eth_dev_tap_create(struct rte_vdev_device *vdev, const char *tap_name,
 	/* Setup some default values */
 	data = dev->data;
 	data->dev_private = pmd;
-	data->dev_flags = RTE_ETH_DEV_INTR_LSC;
+	data->dev_flags = RTE_ETH_DEV_INTR_LSC | RTE_ETH_DEV_CLOSE_REMOVE;
 	data->numa_node = numa_node;
 
 	data->dev_link = pmd_link;
@@ -2446,30 +2463,16 @@ static int
 rte_pmd_tap_remove(struct rte_vdev_device *dev)
 {
 	struct rte_eth_dev *eth_dev = NULL;
-	struct pmd_internals *internals;
 
 	/* find the ethdev entry */
 	eth_dev = rte_eth_dev_allocated(rte_vdev_device_name(dev));
 	if (!eth_dev)
-		return -ENODEV;
-
-	/* mac_addrs must not be freed alone because part of dev_private */
-	eth_dev->data->mac_addrs = NULL;
+		return 0;
 
 	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
 		return rte_eth_dev_release_port(eth_dev);
 
 	tap_dev_close(eth_dev);
-
-	internals = eth_dev->data->dev_private;
-	TAP_LOG(DEBUG, "Closing %s Ethernet device on numa %u",
-		tuntap_types[internals->type], rte_socket_id());
-
-	close(internals->ioctl_sock);
-	rte_free(eth_dev->process_private);
-	if (tap_devices_count == 1)
-		rte_mp_action_unregister(TAP_MP_KEY);
-	tap_devices_count--;
 	rte_eth_dev_release_port(eth_dev);
 
 	return 0;
-- 
2.23.0