Hi Connor, 

Thanks for looking at this. Left some comments inline.

Ciara

>-----Original Message-----
>From: Min Hu (Connor) <humi...@huawei.com>
>Sent: Thursday 15 April 2021 12:50
>To: dev@dpdk.org
>Cc: Yigit, Ferruh <ferruh.yi...@intel.com>; Power, Ciara
><ciara.po...@intel.com>; Pattan, Reshma <reshma.pat...@intel.com>;
>david.march...@redhat.com
>Subject: [PATCH v3 1/2] telemetry: fix missing check for thread creation
>
>From: Chengwen Feng <fengcheng...@huawei.com>
>
>Add result check and message print out for thread creation after failure.
>
>Fixes: b80fe1805eee ("telemetry: introduce backward compatibility")
>Cc: sta...@dpdk.org
>
>Signed-off-by: Chengwen Feng <fengcheng...@huawei.com>
>Signed-off-by: Min Hu (Connor) <humi...@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

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