--- /dev/null
+/*
+ *------------------------------------------------------------------
+ * cj.c
+ *
+ * Copyright (c) 2013 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *------------------------------------------------------------------
+ */
+
+/**
+ * @file
+ * Circular joournal diagnostic mechanism.
+ *
+ * The @c cj thread-safe circular log buffer scheme is occasionally useful
+ * when chasing bugs. Calls to it should not be checked in.
+ */
+/*? %%clicmd:group_label Circular Journal %% ?*/
+/*? %%syscfg:group_label Circular Journal %% ?*/
+
+#include <stdio.h>
+#include <vlib/vlib.h>
+
+#include <vlib/unix/cj.h>
+
+cj_main_t cj_main;
+
+void
+cj_log (u32 type, void *data0, void *data1)
+{
+ u64 new_tail;
+ cj_main_t *cjm = &cj_main;
+ cj_record_t *r;
+
+ if (cjm->enable == 0)
+ return;
+
+ new_tail = __sync_add_and_fetch (&cjm->tail, 1);
+
+ r = (cj_record_t *) & (cjm->records[new_tail & (cjm->num_records - 1)]);
+ r->time = vlib_time_now (cjm->vlib_main);
+ r->cpu = os_get_cpu_number ();
+ r->type = type;
+ r->data[0] = pointer_to_uword (data0);
+ r->data[1] = pointer_to_uword (data1);
+}
+
+void
+cj_stop (void)
+{
+ cj_main_t *cjm = &cj_main;
+
+ cjm->enable = 0;
+}
+
+
+clib_error_t *
+cj_init (vlib_main_t * vm)
+{
+ cj_main_t *cjm = &cj_main;
+
+ cjm->vlib_main = vm;
+ return 0;
+}
+
+VLIB_INIT_FUNCTION (cj_init);
+
+static clib_error_t *
+cj_config (vlib_main_t * vm, unformat_input_t * input)
+{
+ cj_main_t *cjm = &cj_main;
+ int matched = 0;
+ int enable = 0;
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "records %d", &cjm->num_records))
+ matched = 1;
+ else if (unformat (input, "on"))
+ enable = 1;
+ else
+ return clib_error_return (0, "cj_config: unknown input '%U'",
+ format_unformat_error, input);
+ }
+
+ if (matched == 0)
+ return 0;
+
+ cjm->num_records = max_pow2 (cjm->num_records);
+ vec_validate (cjm->records, cjm->num_records - 1);
+ memset (cjm->records, 0xff, cjm->num_records * sizeof (cj_record_t));
+ cjm->tail = ~0;
+ cjm->enable = enable;
+
+ return 0;
+}
+
+/*?
+ * Configure the circular journal diagnostic mechanism. This is only useful
+ * if you, the deveoper, have written code to make use of the circular
+ * journal.
+ *
+ * @cfgcmd{records, <number>}
+ * Configure the number of records to allocate for the circular journal.
+ *
+ * @cfgcmd{on}
+ * Enable the collection of records in the circular journal at the
+ * earliest opportunity.
+?*/
+VLIB_CONFIG_FUNCTION (cj_config, "cj");
+
+void
+cj_enable_disable (int is_enable)
+{
+ cj_main_t *cjm = &cj_main;
+
+ if (cjm->num_records)
+ cjm->enable = is_enable;
+ else
+ vlib_cli_output (cjm->vlib_main, "CJ not configured...");
+}
+
+static inline void
+cj_dump_one_record (cj_record_t * r)
+{
+ fprintf (stderr, "[%d]: %10.6f T%02d %llx %llx\n",
+ r->cpu, r->time, r->type, (long long unsigned int) r->data[0],
+ (long long unsigned int) r->data[1]);
+}
+
+static void
+cj_dump_internal (u8 filter0_enable, u64 filter0,
+ u8 filter1_enable, u64 filter1)
+{
+ cj_main_t *cjm = &cj_main;
+ cj_record_t *r;
+ u32 i, index;
+
+ if (cjm->num_records == 0)
+ {
+ fprintf (stderr, "CJ not configured...\n");
+ return;
+ }
+
+ if (cjm->tail == (u64) ~ 0)
+ {
+ fprintf (stderr, "No data collected...\n");
+ return;
+ }
+
+ /* Has the trace wrapped? */
+ index = (cjm->tail + 1) & (cjm->num_records - 1);
+ r = &(cjm->records[index]);
+
+ if (r->cpu != (u32) ~ 0)
+ {
+ /* Yes, dump from tail + 1 to the end */
+ for (i = index; i < cjm->num_records; i++)
+ {
+ if (filter0_enable && (r->data[0] != filter0))
+ goto skip;
+ if (filter1_enable && (r->data[1] != filter1))
+ goto skip;
+ cj_dump_one_record (r);
+ skip:
+ r++;
+ }
+ }
+ /* dump from the beginning through the final tail */
+ r = cjm->records;
+ for (i = 0; i <= cjm->tail; i++)
+ {
+ if (filter0_enable && (r->data[0] != filter0))
+ goto skip2;
+ if (filter1_enable && (r->data[1] != filter1))
+ goto skip2;
+ cj_dump_one_record (r);
+ skip2:
+ r++;
+ }
+}
+
+void
+cj_dump (void)
+{
+ cj_dump_internal (0, 0, 0, 0);
+}
+
+void
+cj_dump_filter_data0 (u64 filter0)
+{
+ cj_dump_internal (1 /* enable f0 */ , filter0, 0, 0);
+}
+
+void
+cj_dump_filter_data1 (u64 filter1)
+{
+ cj_dump_internal (0, 0, 1 /* enable f1 */ , filter1);
+}
+
+void
+cj_dump_filter_data12 (u64 filter0, u64 filter1)
+{
+ cj_dump_internal (1, filter0, 1, filter1);
+}
+
+static clib_error_t *
+cj_command_fn (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ int is_enable = -1;
+ int is_dump = -1;
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "enable") || unformat (input, "on"))
+ is_enable = 1;
+ else if (unformat (input, "disable") || unformat (input, "off"))
+ is_enable = 0;
+ else if (unformat (input, "dump"))
+ is_dump = 1;
+ else
+ return clib_error_return (0, "unknown input `%U'",
+ format_unformat_error, input);
+ }
+
+ if (is_enable >= 0)
+ cj_enable_disable (is_enable);
+
+ if (is_dump > 0)
+ cj_dump ();
+
+ return 0;
+}
+
+/*?
+ * Enable, disable the collection of diagnostic data into a
+ * circular journal or dump the circular journal diagnostic data.
+ * This is only useful if you, the deveoper, have written code to make
+ * use of the circular journal.
+ *
+ * When dumping the data it is formatted and sent to @c stderr of the
+ * VPP process; when running VPP in <code>unix interactive</code> mode
+ * this is typically the same place as the Debug CLI.
+?*/
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (cj_command,static) = {
+ .path = "cj",
+ .short_help = "cj <enable | disable | dump>",
+ .function = cj_command_fn,
+};
+/* *INDENT-ON* */
+
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
Code Review / vpp.git / blobdiff