gdb-helper: add gdb_show_traces
gdb_show_traces() dumps buffer traces.
Ease gdb debugging when vpp crashed...
@@ -185,6 +185,79 @@ gdb_show_session (int verbose)
unformat_free (&input);
}
+static int
+trace_cmp (void *a1, void *a2)
+{
+ vlib_trace_header_t **t1 = a1;
+ vlib_trace_header_t **t2 = a2;
+ i64 dt = t1[0]->time - t2[0]->time;
+ return dt < 0 ? -1 : (dt > 0 ? +1 : 0);
+}
+
+void
+gdb_show_traces ()
+{
+ vlib_trace_main_t *tm;
+ vlib_trace_header_t **h, **traces;
+ u32 i, index = 0;
+ char *fmt;
+ u8 *s = 0;
+ u32 max;
+
+ /* By default display only this many traces. */
+ max = 50;
+
+ /* Get active traces from pool. */
+
+ /* *INDENT-OFF* */
+ foreach_vlib_main (
+ ({
+ fmt = "------------------- Start of thread %d %s -------------------\n";
+ s = format (s, fmt, index, vlib_worker_threads[index].name);
+
+ tm = &this_vlib_main->trace_main;
+
+ trace_apply_filter(this_vlib_main);
+
+ traces = 0;
+ pool_foreach (h, tm->trace_buffer_pool,
+ ({
+ vec_add1 (traces, h[0]);
+ }));
+
+ if (vec_len (traces) == 0)
+ {
+ s = format (s, "No packets in trace buffer\n");
+ goto done;
+ }
+
+ /* Sort them by increasing time. */
+ vec_sort_with_function (traces, trace_cmp);
+
+ for (i = 0; i < vec_len (traces); i++)
+ {
+ if (i == max)
+ {
+ fformat (stderr, "Limiting display to %d packets."
+ " To display more specify max.", max);
+ goto done;
+ }
+
+ s = format (s, "Packet %d\n%U\n\n", i + 1,
+ format_vlib_trace, vlib_mains[0], traces[i]);
+ }
+
+ done:
+ vec_free (traces);
+
+ index++;
+ }));
+ /* *INDENT-ON* */
+
+ fformat (stderr, "%v", s);
+ vec_free (s);
+}
+
/**
* @brief GDB callable function: show_gdb_command_fn - show gdb
*
@@ -203,6 +276,7 @@ show_gdb_command_fn (vlib_main_t * vm,
vlib_cli_output (vm, "pifi(p, i) returns pool_is_free_index(p, i)");
vlib_cli_output (vm, "gdb_show_errors(0|1) dumps error counters");
vlib_cli_output (vm, "gdb_show_session dumps session counters");
+ vlib_cli_output (vm, "gdb_show_traces() dumps buffer traces");
vlib_cli_output (vm, "debug_hex_bytes (ptr, n_bytes) dumps n_bytes in hex");
vlib_cli_output (vm, "vlib_dump_frame_ownership() does what it says");
vlib_cli_output (vm, "vlib_runtime_index_to_node_name (index) prints NN");
