+
+int
+vnet_pcap_dispatch_trace_configure (vnet_pcap_dispatch_trace_args_t * a)
+{
+ vlib_main_t *vm = vlib_get_main ();
+ vlib_rx_or_tx_t rxtx = a->rxtx;
+ vnet_pcap_t *pp = &vm->pcap[rxtx];
+ pcap_main_t *pm = &pp->pcap_main;
+
+ if (a->status)
+ {
+ if (pp->pcap_enable == 0)
+ {
+ vlib_cli_output
+ (vm, "pcap %s dispatch capture enabled: %d of %d pkts...",
+ (rxtx == VLIB_RX) ? "rx" : "tx",
+ pm->n_packets_captured, pm->n_packets_to_capture);
+ vlib_cli_output (vm, "capture to file %s", pm->file_name);
+ }
+ else
+ vlib_cli_output (vm, "pcap %s dispatch capture disabled",
+ (rxtx == VLIB_RX) ? "rx" : "tx");
+ return 0;
+ }
+
+ /* Consistency checks */
+
+ /* Enable w/ capture already enabled not allowed */
+ if (pp->pcap_enable && a->enable)
+ return VNET_API_ERROR_INVALID_VALUE;
+
+ /* Disable capture with capture already disabled, not interesting */
+ if (pp->pcap_enable == 0 && a->enable == 0)
+ return VNET_API_ERROR_VALUE_EXIST;
+
+ /* Change number of packets to capture while capturing */
+ if (pp->pcap_enable && a->enable
+ && (pm->n_packets_to_capture != a->packets_to_capture))
+ return VNET_API_ERROR_INVALID_VALUE_2;
+
+ if (a->enable)
+ {
+ /* Clean up from previous run, if any */
+ vec_free (pm->file_name);
+ vec_free (pm->pcap_data);
+ memset (pm, 0, sizeof (*pm));
+
+ vec_validate_aligned (vnet_trace_dummy, 2048, CLIB_CACHE_LINE_BYTES);
+ if (pm->lock == 0)
+ clib_spinlock_init (&(pm->lock));
+
+ if (a->filename == 0)
+ a->filename = format (0, "/tmp/%s.pcap%c",
+ (rxtx == VLIB_RX) ? "rx" : "tx", 0);
+
+ pm->file_name = (char *) a->filename;
+ pm->n_packets_captured = 0;
+ pm->packet_type = PCAP_PACKET_TYPE_ethernet;
+ pm->n_packets_to_capture = a->packets_to_capture;
+ pp->pcap_sw_if_index = a->sw_if_index;
+ pp->pcap_enable = 1;
+ }
+ else
+ {
+ pp->pcap_enable = 0;
+ if (pm->n_packets_captured)
+ {
+ clib_error_t *error;
+ pm->n_packets_to_capture = pm->n_packets_captured;
+ vlib_cli_output (vm, "Write %d packets to %s, and stop capture...",
+ pm->n_packets_captured, pm->file_name);
+ error = pcap_write (pm);
+ if (pm->file_descriptor >= 0)
+ pcap_close (pm);
+ /* Report I/O errors... */
+ if (error)
+ {
+ clib_error_report (error);
+ return VNET_API_ERROR_SYSCALL_ERROR_1;
+ }
+ return 0;
+ }
+ else
+ return VNET_API_ERROR_NO_SUCH_ENTRY;
+ }
+
+ return 0;
+}
+
+static clib_error_t *
+pcap_trace_command_internal (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd, vlib_rx_or_tx_t rxtx)
+{
+ unformat_input_t _line_input, *line_input = &_line_input;
+ vnet_pcap_dispatch_trace_args_t _a, *a = &_a;
+ vnet_main_t *vnm = vnet_get_main ();
+ u8 *filename = 0;
+ u32 max = 1000;
+ int rv;
+ int enable = 0;
+ int status = 0;
+ u32 sw_if_index = 0;
+
+ /* Get a line of input. */
+ if (!unformat_user (input, unformat_line_input, line_input))
+ return 0;
+
+ while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (line_input, "on %=", &enable, 1))
+ ;
+ else if (unformat (line_input, "enable %=", &enable, 1))
+ ;
+ else if (unformat (line_input, "off %=", &enable, 0))
+ ;
+ else if (unformat (line_input, "disable %=", &enable, 0))
+ ;
+ else if (unformat (line_input, "max %d", &max))
+ ;
+ else if (unformat (line_input, "packets-to-capture %d", &max))
+ ;
+ else if (unformat (line_input, "file %U", unformat_vlib_tmpfile,
+ &filename))
+ ;
+ else if (unformat (line_input, "status %=", &status, 1))
+ ;
+ else if (unformat (line_input, "intfc %U",
+ unformat_vnet_sw_interface, vnm, &sw_if_index))
+ ;
+ else if (unformat (line_input, "intfc any"))
+ sw_if_index = 0;
+ else
+ {
+ return clib_error_return (0, "unknown input `%U'",
+ format_unformat_error, line_input);
+ }
+ }
+
+ unformat_free (line_input);
+
+ /* no need for memset (a, 0, sizeof (*a)), set all fields here. */
+ a->filename = filename;
+ a->enable = enable;
+ a->status = status;
+ a->packets_to_capture = max;
+ a->rxtx = rxtx;
+ a->sw_if_index = sw_if_index;
+
+ rv = vnet_pcap_dispatch_trace_configure (a);
+
+ switch (rv)
+ {
+ case 0:
+ break;
+
+ case VNET_API_ERROR_INVALID_VALUE:
+ return clib_error_return (0, "dispatch trace already enabled...");
+
+ case VNET_API_ERROR_VALUE_EXIST:
+ return clib_error_return (0, "dispatch trace already disabled...");
+
+ case VNET_API_ERROR_INVALID_VALUE_2:
+ return clib_error_return
+ (0, "can't change number of records to capture while tracing...");
+
+ case VNET_API_ERROR_SYSCALL_ERROR_1:
+ return clib_error_return (0, "I/O writing trace capture...");
+
+ case VNET_API_ERROR_NO_SUCH_ENTRY:
+ return clib_error_return (0, "No packets captured...");
+
+ default:
+ vlib_cli_output (vm, "WARNING: trace configure returned %d", rv);
+ break;
+ }
+ return 0;
+}
+
+static clib_error_t *
+pcap_rx_trace_command_fn (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ return pcap_trace_command_internal (vm, input, cmd, VLIB_RX);
+}
+
+static clib_error_t *
+pcap_tx_trace_command_fn (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ return pcap_trace_command_internal (vm, input, cmd, VLIB_TX);
+}
+
+
+/*?
+ * This command is used to start or stop a packet capture, or show
+ * the status of packet capture. Note that both "pcap rx trace" and
+ * "pcap tx trace" are implemented. The command syntax is identical,
+ * simply substitute rx for tx as needed.
+ *
+ * This command has the following optional parameters:
+ *
+ * - <b>on|off</b> - Used to start or stop a packet capture.
+ *
+ * - <b>max <nn></b> - Depth of local buffer. Once '<em>nn</em>' number
+ * of packets have been received, buffer is flushed to file. Once another
+ * '<em>nn</em>' number of packets have been received, buffer is flushed
+ * to file, overwriting previous write. If not entered, value defaults
+ * to 100. Can only be updated if packet capture is off.
+ *
+ * - <b>intfc <interface>|any</b> - Used to specify a given interface,
+ * or use '<em>any</em>' to run packet capture on all interfaces.
+ * '<em>any</em>' is the default if not provided. Settings from a previous
+ * packet capture are preserved, so '<em>any</em>' can be used to reset
+ * the interface setting.
+ *
+ * - <b>file <name></b> - Used to specify the output filename. The file will
+ * be placed in the '<em>/tmp</em>' directory, so only the filename is
+ * supported. Directory should not be entered. If file already exists, file
+ * will be overwritten. If no filename is provided, '<em>/tmp/vpe.pcap</em>'
+ * will be used. Can only be updated if packet capture is off.
+ *
+ * - <b>status</b> - Displays the current status and configured attributes
+ * associated with a packet capture. If packet capture is in progress,
+ * '<em>status</em>' also will return the number of packets currently in
+ * the local buffer. All additional attributes entered on command line
+ * with '<em>status</em>' will be ignored and not applied.
+ *
+ * @cliexpar
+ * Example of how to display the status of a tx packet capture when off:
+ * @cliexstart{pcap tx trace status}
+ * max is 100, for any interface to file /tmp/vpe.pcap
+ * pcap tx capture is off...
+ * @cliexend
+ * Example of how to start a tx packet capture:
+ * @cliexstart{pcap tx trace on max 35 intfc GigabitEthernet0/8/0 file vppTest.pcap}
+ * pcap tx capture on...
+ * @cliexend
+ * Example of how to display the status of a tx packet capture in progress:
+ * @cliexstart{pcap tx trace status}
+ * max is 35, for interface GigabitEthernet0/8/0 to file /tmp/vppTest.pcap
+ * pcap tx capture is on: 20 of 35 pkts...
+ * @cliexend
+ * Example of how to stop a tx packet capture:
+ * @cliexstart{vppctl pcap tx trace off}
+ * captured 21 pkts...
+ * saved to /tmp/vppTest.pcap...
+ * @cliexend
+?*/
+/* *INDENT-OFF* */
+
+VLIB_CLI_COMMAND (pcap_tx_trace_command, static) = {
+ .path = "pcap tx trace",
+ .short_help =
+ "pcap tx trace [on|off] [max <nn>] [intfc <interface>|any] [file <name>] [status]",
+ .function = pcap_tx_trace_command_fn,
+};
+VLIB_CLI_COMMAND (pcap_rx_trace_command, static) = {
+ .path = "pcap rx trace",
+ .short_help =
+ "pcap rx trace [on|off] [max <nn>] [intfc <interface>|any] [file <name>] [status]",
+ .function = pcap_rx_trace_command_fn,
+};
+/* *INDENT-ON* */
+
+