[dpdk-dev] [PATCH V3 4/4] app/testpmd: show example to handle hot unplug

[Jeff Guo]

Use testpmd for example, to show how an application smoothly handle
failure when device being hot unplug. If app have enabled the device event
monitor and register the hot plug event’s callback before running, once
app detect the removal event, the callback would be called. It will first
stop the packet forwarding, then stop the port, close the port, and finally
detach the port to remove the device out from the device lists.

Signed-off-by: Jeff Guo <jia.guo at intel.com>
---
v3->v2:
delete some unused check
---
 app/test-pmd/testpmd.c | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index 24c1998..2ee5621 100644
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -1951,9 +1951,10 @@ eth_dev_event_callback_unregister(void)
 void
 attach_port(char *identifier)
 {
-	portid_t pi = 0;
 	unsigned int socket_id;
 
+	portid_t pi = rte_eth_dev_count_avail();
+
 	printf("Attaching a new port...\n");
 
 	if (identifier == NULL) {
@@ -2125,16 +2126,22 @@ check_all_ports_link_status(uint32_t port_mask)
 static void
 rmv_event_callback(void *arg)
 {
+	struct rte_eth_dev *dev;
+
 	int need_to_start = 0;
 	int org_no_link_check = no_link_check;
 	portid_t port_id = (intptr_t)arg;
 
 	RTE_ETH_VALID_PORTID_OR_RET(port_id);
+	dev = &rte_eth_devices[port_id];
+
+	printf("removing device %s\n", dev->device->name);
 
 	if (!test_done && port_is_forwarding(port_id)) {
 		need_to_start = 1;
 		stop_packet_forwarding();
 	}
+
 	no_link_check = 1;
 	stop_port(port_id);
 	no_link_check = org_no_link_check;
@@ -2196,6 +2203,9 @@ 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);
@@ -2206,9 +2216,12 @@ 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) {
+			printf("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",
@@ -2736,7 +2749,6 @@ main(int argc, char** argv)
 			return -1;
 		}
 		eth_dev_event_callback_register();
-
 	}
 
 	if (start_port(RTE_PORT_ALL) != 0)
-- 
2.7.4