[dpdk-dev] [PATCH v13 7/7] app/testpmd: use hotplug failure handler

Iremonger, Bernard bernard.iremonger at intel.com
Thu Oct 4 12:31:17 CEST 2018


Hi Jeff,

> -----Original Message-----
> From: Guo, Jia
> Sent: Thursday, October 4, 2018 7:31 AM
> To: stephen at networkplumber.org; Richardson, Bruce
> <bruce.richardson at intel.com>; Yigit, Ferruh <ferruh.yigit at intel.com>; Ananyev,
> Konstantin <konstantin.ananyev at intel.com>; gaetan.rivet at 6wind.com; Wu,
> Jingjing <jingjing.wu at intel.com>; thomas at monjalon.net;
> motih at mellanox.com; matan at mellanox.com; Van Haaren, Harry
> <harry.van.haaren at intel.com>; Zhang, Qi Z <qi.z.zhang at intel.com>; He,
> Shaopeng <shaopeng.he at intel.com>; Iremonger, Bernard
> <bernard.iremonger at intel.com>; arybchenko at solarflare.com; Lu, Wenzhuo
> <wenzhuo.lu at intel.com>; Burakov, Anatoly <anatoly.burakov at intel.com>;
> jerin.jacob at caviumnetworks.com
> Cc: jblunck at infradead.org; shreyansh.jain at nxp.com; dev at dpdk.org; Guo, Jia
> <jia.guo at intel.com>; Zhang, Helin <helin.zhang at intel.com>
> Subject: [PATCH v13 7/7] 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 at intel.com>
> ---
> v13->v12:
> delete needless helper in app.
> ---
>  app/test-pmd/testpmd.c | 86 +++++++++++++++++++++++--------------------------
> -
>  1 file changed, 40 insertions(+), 46 deletions(-)
> 
> diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c index
> 001f0e5..f3f8e44 100644
> --- a/app/test-pmd/testpmd.c
> +++ b/app/test-pmd/testpmd.c
> @@ -434,9 +434,6 @@ 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.
> @@ -1954,39 +1951,6 @@ 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)
>  {
> @@ -2093,14 +2057,25 @@ 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) {
> +			printf("fail to unregister device event callback.\n");

Better to use RTE_LOG()  instead of printf().

> +			return;
> +		}
> +
> +		ret = rte_dev_hotplug_handle_disable();
> +		if (ret) {
>  			RTE_LOG(ERR, EAL,
> -				"fail to unregister all event callbacks.");
> +				"fail to disable hotplug handling.\n");
> +			return;
> +		}
>  	}
> 
>  	printf("\nBye...\n");
> @@ -2244,6 +2219,9 @@ 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);
> @@ -2254,9 +2232,13 @@ 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", @@ -
> 2779,14 +2761,26 @@ 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) {
> +			printf("faile to register device event callback\n");

Better to use RTE_LOG() instead of peintf(). Note type in message, "faile" should be "failed"

> +			return -1;
> +		}
>  	}
> 
>  	if (start_port(RTE_PORT_ALL) != 0)
> --
> 2.7.4



More information about the dev mailing list