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authorDave Barach <dave@barachs.net>2020-01-23 08:44:40 -0500
committerDave Barach <dave@barachs.net>2020-01-23 08:55:43 -0500
commitf66f88383848565f65db3029b4c4fbfc424906e1 (patch)
tree7f0261c7f425c78f543de7a1624864231667d07d
parent7ec120e8dd8ab366fab27eca4e6402f213e24cc8 (diff)
api: mark api_trace_command_fn thread-safe
Binary API trace replay with multiple worker threads depends in many cases on worker thread graph replica maintenance. If we (implicitly) assert a worker thread barrier at the debug CLI level, all graph replica changes are deferred until the replay operation completes. If an interface is deleted, the wheels may fall off. Type: fix Ticket: VPP-1824 Signed-off-by: Dave Barach <dave@barachs.net> Change-Id: I9b07d43f8501caa5519e5ff9ae4c19dc2661cc84
-rwxr-xr-xsrc/vlibmemory/vlib_api_cli.c21
1 files changed, 20 insertions, 1 deletions
diff --git a/src/vlibmemory/vlib_api_cli.c b/src/vlibmemory/vlib_api_cli.c
index db4871179d6..c79ac2bc75a 100755
--- a/src/vlibmemory/vlib_api_cli.c
+++ b/src/vlibmemory/vlib_api_cli.c
@@ -671,6 +671,16 @@ vl_msg_api_process_file (vlib_main_t * vm, u8 * filename,
am->replay_in_progress = 0;
}
+/** api_trace_command_fn - control the binary API trace / replay feature
+
+ Note: this command MUST be marked thread-safe. Replay with
+ multiple worker threads depends in many cases on worker thread
+ graph replica maintenance. If we (implicitly) assert a worker
+ thread barrier at the debug CLI level, all graph replica changes
+ are deferred until the replay operation completes. If an interface
+ is deleted, the wheels fall off.
+ */
+
static clib_error_t *
api_trace_command_fn (vlib_main_t * vm,
unformat_input_t * input, vlib_cli_command_t * cmd)
@@ -691,12 +701,16 @@ api_trace_command_fn (vlib_main_t * vm,
{
if (unformat (input, "nitems %d", &nitems))
;
+ vlib_worker_thread_barrier_sync (vm);
vl_msg_api_trace_configure (am, which, nitems);
vl_msg_api_trace_onoff (am, which, 1 /* on */ );
+ vlib_worker_thread_barrier_release (vm);
}
else if (unformat (input, "off"))
{
+ vlib_worker_thread_barrier_sync (vm);
vl_msg_api_trace_onoff (am, which, 0);
+ vlib_worker_thread_barrier_release (vm);
}
else if (unformat (input, "save %s", &filename))
{
@@ -718,7 +732,9 @@ api_trace_command_fn (vlib_main_t * vm,
vlib_cli_output (vm, "Couldn't create %s\n", chroot_filename);
goto out;
}
+ vlib_worker_thread_barrier_sync (vm);
rv = vl_msg_api_trace_save (am, which, fp);
+ vlib_worker_thread_barrier_release (vm);
fclose (fp);
if (rv == -1)
vlib_cli_output (vm, "API Trace data not present\n");
@@ -775,8 +791,10 @@ api_trace_command_fn (vlib_main_t * vm,
}
else if (unformat (input, "free"))
{
+ vlib_worker_thread_barrier_sync (vm);
vl_msg_api_trace_onoff (am, which, 0);
vl_msg_api_trace_free (am, which);
+ vlib_worker_thread_barrier_release (vm);
}
else if (unformat (input, "post-mortem-on"))
vl_msg_api_post_mortem_dump_enable_disable (1 /* enable */ );
@@ -801,8 +819,9 @@ VLIB_CLI_COMMAND (api_trace_command, static) =
{
.path = "api trace",
.short_help = "api trace [on|off][first <n>][last <n>][status][free]"
- "[post-mortem-on][dump|custom-dump|save|replay <file>]",
+ "[post-mortem-on][dump|custom-dump|save|replay <file>]",
.function = api_trace_command_fn,
+ .is_mp_safe = 1,
};
/* *INDENT-ON* */