Re: [dpdk-dev] [PATCH v3 1/2] telemetry: fix missing check for thread creation

["Min Hu (Connor)" <humin29@huawei.com>]

Thanks Power, v4 has been sent, please check it out.

在 2021/4/16 0:11, Power, Ciara 写道:
> Hi Connor,
> 
> Thanks for looking at this. Left some comments inline.
> 
> Ciara
> 
>> -----Original Message-----
>> From: Min Hu (Connor) <humin29@huawei.com>
>> Sent: Thursday 15 April 2021 12:50
>> To: dev@dpdk.org
>> Cc: Yigit, Ferruh <ferruh.yigit@intel.com>; Power, Ciara
>> <ciara.power@intel.com>; Pattan, Reshma <reshma.pattan@intel.com>;
>> david.marchand@redhat.com
>> Subject: [PATCH v3 1/2] telemetry: fix missing check for thread creation
>>
>> From: Chengwen Feng <fengchengwen@huawei.com>
>>
>> Add result check and message print out for thread creation after failure.
>>
>> Fixes: b80fe1805eee ("telemetry: introduce backward compatibility")
>> Cc: stable@dpdk.org
>>
>> Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
>> Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
>> ---
>> lib/librte_telemetry/telemetry.c        | 30 +++++++++++++++++++++++++++-
>> --
>> lib/librte_telemetry/telemetry_legacy.c | 10 ++++++++--
>> 2 files changed, 35 insertions(+), 5 deletions(-)
>>
>> diff --git a/lib/librte_telemetry/telemetry.c
>> b/lib/librte_telemetry/telemetry.c
>> index 7e08afd..e6a99f3 100644
>> --- a/lib/librte_telemetry/telemetry.c
>> +++ b/lib/librte_telemetry/telemetry.c
>> @@ -350,6 +350,7 @@ socket_listener(void *socket)  {
>> 	while (1) {
>> 		pthread_t th;
>> +		int rc;
>> 		struct socket *s = (struct socket *)socket;
>> 		int s_accepted = accept(s->sock, NULL, NULL);
>> 		if (s_accepted < 0) {
>> @@ -366,7 +367,12 @@ socket_listener(void *socket)
>> 			__atomic_add_fetch(s->num_clients, 1,
>> 					__ATOMIC_RELAXED);
>> 		}
>> -		pthread_create(&th, NULL, s->fn, (void
>> *)(uintptr_t)s_accepted);
>> +		rc = pthread_create(&th, NULL, s->fn, (void
>> *)(uintptr_t)s_accepted);
>> +		if (rc != 0) {
>> +			TMTY_LOG(ERR, "Error with create client thread\n");
>> +			close(s_accepted);
>> +			return NULL;
> 
> 
> I think this should be "continue" instead of "return NULL" - if one client connection thread fails,
> we probably want to keep listening for more clients rather than stop completely.
> 
> The "s->num_clients" counter should be decremented here too,
> it gets incremented above when the connection is accepted, but if we are closing the connection,
> the counter should reflect that.
> 
> 
>> +		}
>> 		pthread_detach(th);
>> 	}
>> 	return NULL;
>> @@ -425,6 +431,7 @@ static int
>> telemetry_legacy_init(void)
>> {
>> 	pthread_t t_old;
>> +	int rc;
>>
>> 	if (num_legacy_callbacks == 1) {
>> 		TMTY_LOG(WARNING, "No legacy callbacks, legacy socket not
>> created\n"); @@ -440,7 +447,15 @@ telemetry_legacy_init(void)
>> 	v1_socket.sock = create_socket(v1_socket.path);
>> 	if (v1_socket.sock < 0)
>> 		return -1;
>> -	pthread_create(&t_old, NULL, socket_listener, &v1_socket);
>> +	rc = pthread_create(&t_old, NULL, socket_listener, &v1_socket);
>> +	if (rc != 0) {
>> +		TMTY_LOG(ERR, "Error with create thread for legacy
>> socket\n");
>> +		close(v1_socket.sock);
>> +		v1_socket.sock = -1;
>> +		unlink(v1_socket.path);
>> +		v1_socket.path[0] = '\0';
>> +		return -1;
>> +	}
>> 	pthread_setaffinity_np(t_old, sizeof(*thread_cpuset),
>> thread_cpuset);
>>
>> 	TMTY_LOG(DEBUG, "Legacy telemetry socket initialized ok\n"); @@ -
>> 451,6 +466,7 @@ static int
>> telemetry_v2_init(void)
>> {
>> 	pthread_t t_new;
>> +	int rc;
>>
>> 	v2_socket.num_clients = &v2_clients;
>> 	rte_telemetry_register_cmd("/", list_commands, @@ -469,7 +485,15
>> @@ telemetry_v2_init(void)
>> 	v2_socket.sock = create_socket(v2_socket.path);
>> 	if (v2_socket.sock < 0)
>> 		return -1;
>> -	pthread_create(&t_new, NULL, socket_listener, &v2_socket);
>> +	rc = pthread_create(&t_new, NULL, socket_listener, &v2_socket);
>> +	if (rc != 0) {
>> +		TMTY_LOG(ERR, "Error with create thread for socket");
>> +		close(v2_socket.sock);
>> +		v2_socket.sock = -1;
>> +		unlink(v2_socket.path);
>> +		v2_socket.path[0] = '\0';
>> +		return -1;
>> +	}
>> 	pthread_setaffinity_np(t_new, sizeof(*thread_cpuset),
>> thread_cpuset);
>> 	atexit(unlink_sockets);
>>
>> diff --git a/lib/librte_telemetry/telemetry_legacy.c
>> b/lib/librte_telemetry/telemetry_legacy.c
>> index 5e9af37..fd242bf 100644
>> --- a/lib/librte_telemetry/telemetry_legacy.c
>> +++ b/lib/librte_telemetry/telemetry_legacy.c
>> @@ -83,6 +83,7 @@ register_client(const char *cmd __rte_unused, const
>> char *params,
>> 	pthread_t th;
>> 	char data[BUF_SIZE];
>> 	int fd;
>> +	int rc;
>> 	struct sockaddr_un addrs;
>> #endif /* !RTE_EXEC_ENV_WINDOWS */
>>
>> @@ -112,8 +113,13 @@ register_client(const char *cmd __rte_unused, const
>> char *params,
>> 		close(fd);
>> 		return -1;
>> 	}
>> -	pthread_create(&th, NULL, &legacy_client_handler,
>> -			(void *)(uintptr_t)fd);
>> +	rc = pthread_create(&th, NULL, &legacy_client_handler,
>> +				(void *)(uintptr_t)fd);
>> +	if (rc != 0) {
>> +		perror("Failed to create legacy client thread\n");
>> +		close(fd);
>> +		return -1;
>> +	}
>> #endif /* !RTE_EXEC_ENV_WINDOWS */
>> 	return 0;
>> }
>> --
>> 2.7.4
> 
> .
>