From: Jeff Guo <jia.guo@intel.com>
Date: Mon, 15 Oct 2018 11:27:27 +0000 (+0800)
Subject: app/testpmd: use hotplug failure handler
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=2049c5113fe8;p=dpdk.git

app/testpmd: use hotplug failure handler

This patch use testpmd for example, to show how an app smoothly handle
failure when device be hot-unplug. Except that app should enabled the
device event monitor and register the hotplug event’s callback, it also
need enable hotplug handle mechanism before running. Once app detect the
removal event, the hot-unplug callback would be called. It will first stop
the packet forwarding, then stop the port, close the port, and finally
detach the port to clean the device and release the resources.

Signed-off-by: Jeff Guo <jia.guo@intel.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
Acked-by: Bernard Iremonger <bernard.iremonger@intel.com>
---

diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index d550bdac84..e8b3fa5ac9 100644
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -490,9 +490,6 @@ static int eth_event_callback(portid_t port_id,
 static void eth_dev_event_callback(char *device_name,
 				enum rte_dev_event_type type,
 				void *param);
-static int eth_dev_event_callback_register(void);
-static int eth_dev_event_callback_unregister(void);
-
 
 /*
  * Check if all the ports are started.
@@ -2280,39 +2277,6 @@ reset_port(portid_t pid)
 	printf("Done\n");
 }
 
-static int
-eth_dev_event_callback_register(void)
-{
-	int ret;
-
-	/* register the device event callback */
-	ret = rte_dev_event_callback_register(NULL,
-		eth_dev_event_callback, NULL);
-	if (ret) {
-		printf("Failed to register device event callback\n");
-		return -1;
-	}
-
-	return 0;
-}
-
-
-static int
-eth_dev_event_callback_unregister(void)
-{
-	int ret;
-
-	/* unregister the device event callback */
-	ret = rte_dev_event_callback_unregister(NULL,
-		eth_dev_event_callback, NULL);
-	if (ret < 0) {
-		printf("Failed to unregister device event callback\n");
-		return -1;
-	}
-
-	return 0;
-}
-
 void
 attach_port(char *identifier)
 {
@@ -2419,14 +2383,26 @@ pmd_test_exit(void)
 
 	if (hot_plug) {
 		ret = rte_dev_event_monitor_stop();
-		if (ret)
+		if (ret) {
 			RTE_LOG(ERR, EAL,
 				"fail to stop device event monitor.");
+			return;
+		}
 
-		ret = eth_dev_event_callback_unregister();
-		if (ret)
+		ret = rte_dev_event_callback_unregister(NULL,
+			eth_dev_event_callback, NULL);
+		if (ret < 0) {
 			RTE_LOG(ERR, EAL,
-				"fail to unregister all event callbacks.");
+				"fail to unregister device event callback.\n");
+			return;
+		}
+
+		ret = rte_dev_hotplug_handle_disable();
+		if (ret) {
+			RTE_LOG(ERR, EAL,
+				"fail to disable hotplug handling.\n");
+			return;
+		}
 	}
 
 	printf("\nBye...\n");
@@ -2570,6 +2546,9 @@ static void
 eth_dev_event_callback(char *device_name, enum rte_dev_event_type type,
 			     __rte_unused void *arg)
 {
+	uint16_t port_id;
+	int ret;
+
 	if (type >= RTE_DEV_EVENT_MAX) {
 		fprintf(stderr, "%s called upon invalid event %d\n",
 			__func__, type);
@@ -2580,9 +2559,13 @@ eth_dev_event_callback(char *device_name, enum rte_dev_event_type type,
 	case RTE_DEV_EVENT_REMOVE:
 		RTE_LOG(ERR, EAL, "The device: %s has been removed!\n",
 			device_name);
-		/* TODO: After finish failure handle, begin to stop
-		 * packet forward, stop port, close port, detach port.
-		 */
+		ret = rte_eth_dev_get_port_by_name(device_name, &port_id);
+		if (ret) {
+			RTE_LOG(ERR, EAL, "can not get port by device %s!\n",
+				device_name);
+			return;
+		}
+		rmv_event_callback((void *)(intptr_t)port_id);
 		break;
 	case RTE_DEV_EVENT_ADD:
 		RTE_LOG(ERR, EAL, "The device: %s has been added!\n",
@@ -3105,14 +3088,27 @@ main(int argc, char** argv)
 	init_config();
 
 	if (hot_plug) {
-		/* enable hot plug monitoring */
+		ret = rte_dev_hotplug_handle_enable();
+		if (ret) {
+			RTE_LOG(ERR, EAL,
+				"fail to enable hotplug handling.");
+			return -1;
+		}
+
 		ret = rte_dev_event_monitor_start();
 		if (ret) {
-			rte_errno = EINVAL;
+			RTE_LOG(ERR, EAL,
+				"fail to start device event monitoring.");
 			return -1;
 		}
-		eth_dev_event_callback_register();
 
+		ret = rte_dev_event_callback_register(NULL,
+			eth_dev_event_callback, NULL);
+		if (ret) {
+			RTE_LOG(ERR, EAL,
+				"fail  to register device event callback\n");
+			return -1;
+		}
 	}
 
 	if (start_port(RTE_PORT_ALL) != 0)