2 * nsim.c - skeleton vpp engine plug-in
4 * Copyright (c) <current-year> <your-organization>
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
20 * @brief Network Delay Simulator
22 /*? %%clicmd:group_label Network Delay Simulator %% ?*/
24 #include <vnet/vnet.h>
25 #include <vnet/plugin/plugin.h>
26 #include <nsim/nsim.h>
28 #include <vlibapi/api.h>
29 #include <vlibmemory/api.h>
30 #include <vpp/app/version.h>
32 /* define message IDs */
33 #include <nsim/nsim.api_enum.h>
34 #include <nsim/nsim.api_types.h>
36 #define REPLY_MSG_ID_BASE nsm->msg_id_base
37 #include <vlibapi/api_helper_macros.h>
39 nsim_main_t nsim_main;
41 /* Action functions shared between message handlers and debug CLI */
44 nsim_cross_connect_enable_disable (nsim_main_t * nsm, u32 sw_if_index0,
45 u32 sw_if_index1, int enable_disable)
47 vnet_sw_interface_t *sw;
48 vnet_hw_interface_t *hw;
51 if (nsm->is_configured == 0)
52 return VNET_API_ERROR_CANNOT_ENABLE_DISABLE_FEATURE;
55 if (pool_is_free_index (nsm->vnet_main->interface_main.sw_interfaces,
57 return VNET_API_ERROR_INVALID_SW_IF_INDEX;
59 if (pool_is_free_index (nsm->vnet_main->interface_main.sw_interfaces,
61 return VNET_API_ERROR_INVALID_SW_IF_INDEX;
63 /* Not a physical port? */
64 sw = vnet_get_sw_interface (nsm->vnet_main, sw_if_index0);
65 if (sw->type != VNET_SW_INTERFACE_TYPE_HARDWARE)
66 return VNET_API_ERROR_INVALID_SW_IF_INDEX;
68 sw = vnet_get_sw_interface (nsm->vnet_main, sw_if_index1);
69 if (sw->type != VNET_SW_INTERFACE_TYPE_HARDWARE)
70 return VNET_API_ERROR_INVALID_SW_IF_INDEX;
72 /* Add graph arcs for the input / wheel scraper node */
73 hw = vnet_get_hw_interface (nsm->vnet_main, sw_if_index0);
74 nsm->output_next_index0 =
75 vlib_node_add_next (nsm->vlib_main,
76 nsim_input_node.index, hw->output_node_index);
78 hw = vnet_get_hw_interface (nsm->vnet_main, sw_if_index1);
79 nsm->output_next_index1 =
80 vlib_node_add_next (nsm->vlib_main,
81 nsim_input_node.index, hw->output_node_index);
83 nsm->sw_if_index0 = sw_if_index0;
84 nsm->sw_if_index1 = sw_if_index1;
86 vnet_feature_enable_disable ("device-input", "nsim",
87 sw_if_index0, enable_disable, 0, 0);
88 vnet_feature_enable_disable ("device-input", "nsim",
89 sw_if_index1, enable_disable, 0, 0);
95 nsim_output_feature_enable_disable (nsim_main_t * nsm, u32 sw_if_index,
98 vnet_sw_interface_t *sw;
99 vnet_hw_interface_t *hw;
102 if (nsm->is_configured == 0)
103 return VNET_API_ERROR_CANNOT_ENABLE_DISABLE_FEATURE;
106 if (pool_is_free_index (nsm->vnet_main->interface_main.sw_interfaces,
108 return VNET_API_ERROR_INVALID_SW_IF_INDEX;
110 /* Not a physical port? */
111 sw = vnet_get_sw_interface (nsm->vnet_main, sw_if_index);
112 if (sw->type != VNET_SW_INTERFACE_TYPE_HARDWARE)
113 return VNET_API_ERROR_INVALID_SW_IF_INDEX;
115 /* Add a graph arc for the input / wheel scraper node */
116 hw = vnet_get_hw_interface (nsm->vnet_main, sw_if_index);
117 vec_validate_init_empty (nsm->output_next_index_by_sw_if_index, sw_if_index,
119 /* Note: use the tx node, this pkt has already visited the output node... */
120 nsm->output_next_index_by_sw_if_index[sw_if_index] =
121 vlib_node_add_next (nsm->vlib_main, nsim_input_node.index,
124 vnet_feature_enable_disable ("interface-output", "nsim-output-feature",
125 sw_if_index, enable_disable, 0, 0);
129 static nsim_wheel_t *
130 nsim_wheel_alloc (nsim_main_t *nsm)
132 u32 pagesize = getpagesize ();
135 nsm->mmap_size = sizeof (nsim_wheel_t) +
136 nsm->wheel_slots_per_wrk * sizeof (nsim_wheel_entry_t);
138 nsm->mmap_size += pagesize - 1;
139 nsm->mmap_size &= ~(pagesize - 1);
141 wp = clib_mem_vm_alloc (nsm->mmap_size);
143 wp->wheel_size = nsm->wheel_slots_per_wrk;
147 wp->entries = (void *) (wp + 1);
153 nsim_configure (nsim_main_t *nsm, f64 bandwidth, f64 delay, u32 packet_size,
154 f64 drop_fraction, f64 reorder_fraction)
156 u64 total_buffer_size_in_bytes, per_worker_buffer_size, wheel_slots_per_wrk;
157 int i, num_workers = vlib_num_workers ();
158 vlib_main_t *vm = nsm->vlib_main;
160 if (bandwidth == 0.0)
161 return VNET_API_ERROR_INVALID_VALUE;
164 return VNET_API_ERROR_INVALID_VALUE_2;
166 if (packet_size < 64 || packet_size > 9000)
167 return VNET_API_ERROR_INVALID_VALUE_3;
169 if (reorder_fraction > 0.0 && delay == 0.0)
170 return VNET_API_ERROR_INVALID_VALUE_4;
172 /* Toss the old wheel(s)... */
173 if (nsm->is_configured)
175 for (i = 0; i < vec_len (nsm->wheel_by_thread); i++)
177 clib_mem_vm_free (nsm->wheel_by_thread[i], nsm->mmap_size);
178 nsm->wheel_by_thread[i] = 0;
183 nsm->drop_fraction = drop_fraction;
184 nsm->reorder_fraction = reorder_fraction;
186 /* delay in seconds, bandwidth in bits/sec */
187 total_buffer_size_in_bytes = ((delay * bandwidth) / 8.0) + 0.5;
190 * Work out how much buffering each worker needs, assuming decent
194 per_worker_buffer_size = total_buffer_size_in_bytes / num_workers;
196 per_worker_buffer_size = total_buffer_size_in_bytes;
198 wheel_slots_per_wrk = per_worker_buffer_size / packet_size;
199 wheel_slots_per_wrk++;
201 /* Save these for the show command */
202 nsm->bandwidth = bandwidth;
203 nsm->packet_size = packet_size;
204 nsm->wheel_slots_per_wrk = wheel_slots_per_wrk;
206 vec_validate (nsm->wheel_by_thread, num_workers);
208 /* Initialize the output scheduler wheels */
209 i = (!nsm->poll_main_thread && num_workers) ? 1 : 0;
210 for (; i < num_workers + 1; i++)
211 nsm->wheel_by_thread[i] = nsim_wheel_alloc (nsm);
213 vlib_worker_thread_barrier_sync (vm);
215 /* turn on the ring scrapers */
216 i = (!nsm->poll_main_thread && num_workers) ? 1 : 0;
217 for (; i < num_workers + 1; i++)
219 vlib_main_t *this_vm = vlib_get_main_by_index (i);
221 vlib_node_set_state (this_vm, nsim_input_node.index,
222 VLIB_NODE_STATE_POLLING);
225 vlib_worker_thread_barrier_release (vm);
227 nsm->is_configured = 1;
232 * enable or disable the cross-connect
234 static clib_error_t *
235 nsim_cross_connect_enable_disable_command_fn (vlib_main_t * vm,
236 unformat_input_t * input,
237 vlib_cli_command_t * cmd)
239 nsim_main_t *nsm = &nsim_main;
240 unformat_input_t _line_input, *line_input = &_line_input;
241 u32 sw_if_index0 = ~0;
242 u32 sw_if_index1 = ~0;
243 int enable_disable = 1;
247 /* Get a line of input. */
248 if (!unformat_user (input, unformat_line_input, line_input))
251 while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
253 if (unformat (line_input, "disable"))
255 else if (unformat (line_input, "%U", unformat_vnet_sw_interface,
256 nsm->vnet_main, &tmp))
258 if (sw_if_index0 == ~0)
267 unformat_free (line_input);
269 if (sw_if_index0 == ~0 || sw_if_index1 == ~0)
270 return clib_error_return (0, "Please specify two interfaces...");
272 rv = nsim_cross_connect_enable_disable (nsm, sw_if_index0,
273 sw_if_index1, enable_disable);
280 case VNET_API_ERROR_CANNOT_ENABLE_DISABLE_FEATURE:
281 return clib_error_return (0, "Not configured, please 'set nsim' first");
283 case VNET_API_ERROR_INVALID_SW_IF_INDEX:
284 return clib_error_return
285 (0, "Invalid interface, only works on physical ports");
288 case VNET_API_ERROR_UNIMPLEMENTED:
289 return clib_error_return (0,
290 "Device driver doesn't support redirection");
294 return clib_error_return (0, "nsim_enable_disable returned %d", rv);
299 static clib_error_t *
300 nsim_config (vlib_main_t * vm, unformat_input_t * input)
302 nsim_main_t *nsm = &nsim_main;
304 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
306 if (unformat (input, "poll-main-thread"))
308 nsm->poll_main_thread = 1;
312 return clib_error_return (0, "unknown input '%U'",
313 format_unformat_error, input);
319 VLIB_CONFIG_FUNCTION (nsim_config, "nsim");
322 * Enable or disable network simulation cross-connect on two interfaces
323 * The network simulator must have already been configured, see
324 * the "nsim_configure" command.
326 * Place the interfaces into a bridge group, to ensure that
327 * interfaces are in promiscuous mode.
330 * To enable or disable network simulation cross-connect
332 * nsim cross-connect enable-disable TenGigabitEthernet2/0/0 TenGigabitEthernet2/0
333 * nsim cross-connect enable-disable TenGigabitEthernet2/0/0 TenGigabitEthernet2/0 disable
335 * @cliexcmd{nsim enable-disable <intfc> <intfc> [disable]}
338 VLIB_CLI_COMMAND (nsim_enable_disable_command, static) =
340 .path = "nsim cross-connect enable-disable",
342 "nsim cross-connect enable-disable <interface-name-1> "
343 "<interface-name-2> [disable]",
344 .function = nsim_cross_connect_enable_disable_command_fn,
348 /* API message handler */
349 static void vl_api_nsim_cross_connect_enable_disable_t_handler
350 (vl_api_nsim_cross_connect_enable_disable_t * mp)
352 vl_api_nsim_cross_connect_enable_disable_reply_t *rmp;
353 nsim_main_t *nsm = &nsim_main;
355 u32 sw_if_index0, sw_if_index1;
357 sw_if_index0 = clib_net_to_host_u32 (mp->sw_if_index0);
358 sw_if_index1 = clib_net_to_host_u32 (mp->sw_if_index1);
360 if (!vnet_sw_if_index_is_api_valid (sw_if_index0))
362 rv = VNET_API_ERROR_INVALID_SW_IF_INDEX;
363 goto bad_sw_if_index;
365 if (!vnet_sw_if_index_is_api_valid (sw_if_index1))
367 rv = VNET_API_ERROR_INVALID_SW_IF_INDEX_2;
368 goto bad_sw_if_index;
371 rv = nsim_cross_connect_enable_disable (nsm, sw_if_index0, sw_if_index1,
372 (int) (mp->enable_disable));
374 BAD_SW_IF_INDEX_LABEL;
375 REPLY_MACRO (VL_API_NSIM_CROSS_CONNECT_ENABLE_DISABLE_REPLY);
378 /* API message handler */
379 static void vl_api_nsim_output_feature_enable_disable_t_handler
380 (vl_api_nsim_output_feature_enable_disable_t * mp)
382 vl_api_nsim_output_feature_enable_disable_reply_t *rmp;
383 nsim_main_t *nsm = &nsim_main;
385 VALIDATE_SW_IF_INDEX (mp);
387 rv = nsim_output_feature_enable_disable (nsm, ntohl (mp->sw_if_index),
388 (int) (mp->enable_disable));
390 BAD_SW_IF_INDEX_LABEL;
391 REPLY_MACRO (VL_API_NSIM_OUTPUT_FEATURE_ENABLE_DISABLE_REPLY);
394 /* API message handler */
396 vl_api_nsim_configure_t_handler (vl_api_nsim_configure_t * mp)
398 vl_api_nsim_configure_reply_t *rmp;
399 nsim_main_t *nsm = &nsim_main;
400 f64 delay, bandwidth, packet_size, drop_fraction = 0.0, reorder_rate = 0.0;
401 u32 packets_per_drop;
404 delay = ((f64) (ntohl (mp->delay_in_usec))) * 1e-6;
405 bandwidth = (f64) (clib_net_to_host_u64 (mp->bandwidth_in_bits_per_second));
406 packet_size = (f64) (ntohl (mp->average_packet_size));
408 packets_per_drop = ntohl (mp->packets_per_drop);
409 if (packets_per_drop > 0)
410 drop_fraction = 1.0 / (f64) (packets_per_drop);
412 rv = nsim_configure (nsm, bandwidth, delay, packet_size, drop_fraction,
415 REPLY_MACRO (VL_API_NSIM_CONFIGURE_REPLY);
419 vl_api_nsim_configure2_t_handler (vl_api_nsim_configure2_t * mp)
421 vl_api_nsim_configure_reply_t *rmp;
422 nsim_main_t *nsm = &nsim_main;
423 f64 delay, bandwidth, packet_size, drop_fraction = 0.0, reorder_rate = 0.0;
424 u32 packets_per_drop, packets_per_reorder;
427 delay = ((f64) (ntohl (mp->delay_in_usec))) * 1e-6;
428 bandwidth = (f64) (clib_net_to_host_u64 (mp->bandwidth_in_bits_per_second));
429 packet_size = (f64) (ntohl (mp->average_packet_size));
431 packets_per_drop = ntohl (mp->packets_per_drop);
432 if (packets_per_drop > 0)
433 drop_fraction = 1.0 / (f64) (packets_per_drop);
435 packets_per_reorder = ntohl (mp->packets_per_reorder);
436 if (packets_per_reorder > 0)
437 reorder_rate = 1.0 / (f64) packets_per_reorder;
439 rv = nsim_configure (nsm, bandwidth, delay, packet_size, drop_fraction,
442 REPLY_MACRO (VL_API_NSIM_CONFIGURE2_REPLY);
447 * enable or disable the output_feature
449 static clib_error_t *
450 nsim_output_feature_enable_disable_command_fn (vlib_main_t * vm,
451 unformat_input_t * input,
452 vlib_cli_command_t * cmd)
454 nsim_main_t *nsm = &nsim_main;
455 unformat_input_t _line_input, *line_input = &_line_input;
456 u32 sw_if_index = ~0;
457 int enable_disable = 1;
460 /* Get a line of input. */
461 if (!unformat_user (input, unformat_line_input, line_input))
464 while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
466 if (unformat (line_input, "disable"))
468 else if (unformat (line_input, "%U", unformat_vnet_sw_interface,
469 nsm->vnet_main, &sw_if_index))
473 clib_error_t *error = clib_error_return (0, "unknown input `%U'",
474 format_unformat_error,
476 unformat_free (line_input);
481 unformat_free (line_input);
483 if (sw_if_index == ~0)
484 return clib_error_return (0, "Please specify one interface...");
486 rv = nsim_output_feature_enable_disable (nsm, sw_if_index, enable_disable);
493 case VNET_API_ERROR_CANNOT_ENABLE_DISABLE_FEATURE:
494 return clib_error_return (0, "Not configured, please 'set nsim' first");
496 case VNET_API_ERROR_INVALID_SW_IF_INDEX:
497 return clib_error_return
498 (0, "Invalid interface, only works on physical ports");
501 case VNET_API_ERROR_UNIMPLEMENTED:
502 return clib_error_return (0,
503 "Device driver doesn't support redirection");
507 return clib_error_return
508 (0, "nsim_output_feature_enable_disable returned %d", rv);
514 * Enable or disable network simulation output feature on an interface
515 * The network simulator must have already been configured, see
516 * the "nsim_configure" command.
519 * To enable or disable network simulation output feature
521 * nsim output-feature enable-disable TenGigabitEthernet2/0/0
522 * nsim output-feature enable-disable TenGigabitEthernet2/0/0 disable
524 * @cliexcmd{nsim output-feature enable-disable <intfc> [disable]}
527 VLIB_CLI_COMMAND (nsim_output_feature_enable_disable_command, static) =
529 .path = "nsim output-feature enable-disable",
531 "nsim output-feature enable-disable <interface-name> [disable]",
532 .function = nsim_output_feature_enable_disable_command_fn,
536 #include <nsim/nsim.api.c>
537 static clib_error_t *
538 nsim_init (vlib_main_t * vm)
540 nsim_main_t *nsm = &nsim_main;
543 nsm->vnet_main = vnet_get_main ();
545 /* Ask for a correctly-sized block of API message decode slots */
546 nsm->msg_id_base = setup_message_id_table ();
547 nsm->arc_index = nsm->vnet_main->interface_main.output_feature_arc_index;
551 VLIB_INIT_FUNCTION (nsim_init);
554 VNET_FEATURE_INIT (nsim, static) =
556 .arc_name = "device-input",
558 .runs_before = VNET_FEATURES ("ethernet-input"),
563 VNET_FEATURE_INIT (nsim_feature, static) = {
564 .arc_name = "interface-output",
565 .node_name = "nsim-output-feature",
566 .runs_before = VNET_FEATURES ("interface-output-arc-end"),
571 VLIB_PLUGIN_REGISTER () =
573 .version = VPP_BUILD_VER,
574 .description = "Network Delay Simulator",
579 unformat_delay (unformat_input_t * input, va_list * args)
581 f64 *result = va_arg (*args, f64 *);
584 if (unformat (input, "%f us", &tmp))
585 *result = tmp * 1e-6;
586 else if (unformat (input, "%f ms", &tmp))
587 *result = tmp * 1e-3;
588 else if (unformat (input, "%f sec", &tmp))
597 unformat_bandwidth (unformat_input_t * input, va_list * args)
599 f64 *result = va_arg (*args, f64 *);
602 if (unformat (input, "%f gbit", &tmp))
604 else if (unformat (input, "%f gbyte", &tmp))
606 else if (unformat (input, "%f gbps", &tmp))
608 else if (unformat (input, "%f mbps", &tmp))
610 else if (unformat (input, "%f kbps", &tmp))
612 else if (unformat (input, "%f bps", &tmp))
620 format_delay (u8 *s, va_list *args)
622 f64 delay = va_arg (*args, f64);
625 s = format (s, "%.1f us", delay * 1e6);
627 s = format (s, "%.1f ms", delay * 1e3);
629 s = format (s, "%f sec", delay);
635 format_bandwidth (u8 *s, va_list *args)
637 f64 bandwidth = va_arg (*args, f64);
639 if (bandwidth >= 1e9)
640 s = format (s, "%.1f gbps", bandwidth / 1e9);
641 else if (bandwidth >= 1e6)
642 s = format (s, "%.1f mbps", bandwidth / 1e6);
643 else if (bandwidth >= 1e3)
644 s = format (s, "%.1f kbps", bandwidth / 1e3);
646 s = format (s, "%f bps", bandwidth);
652 format_nsim_config (u8 * s, va_list * args)
654 int verbose = va_arg (*args, int);
655 nsim_main_t *nsm = &nsim_main;
657 s = format (s, "configuration\n");
658 s = format (s, " delay: %U\n", format_delay, nsm->delay);
659 if (nsm->drop_fraction)
660 s = format (s, " drop fraction: %.5f\n", nsm->drop_fraction);
662 s = format (s, " drop fraction: 0\n");
663 if (nsm->reorder_fraction)
664 s = format (s, " reorder fraction: %.5f\n", nsm->reorder_fraction);
666 s = format (s, " reorder fraction: 0\n");
667 s = format (s, " packet size: %u\n", nsm->packet_size);
668 s = format (s, " worker wheel size: %u\n", nsm->wheel_slots_per_wrk);
669 s = format (s, " throughput: %U\n", format_bandwidth, nsm->bandwidth);
673 s = format (s, " poll main thread: %u\n", nsm->poll_main_thread);
674 s = format (s, " memory: %U bytes per thread %U bytes total\n",
675 format_memory_size, nsm->mmap_size, format_memory_size,
676 nsm->mmap_size * vlib_num_workers ());
679 s = format (s, "\n");
681 if (nsm->sw_if_index0 != 0)
683 s = format (s, "cross-connect\n %U and %U\n",
684 format_vnet_sw_if_index_name, nsm->vnet_main,
685 nsm->sw_if_index0, format_vnet_sw_if_index_name,
686 nsm->vnet_main, nsm->sw_if_index1);
688 else if (vec_len (nsm->output_next_index_by_sw_if_index))
691 s = format (s, "output feature arcs to:\n");
692 for (i = 0; i < vec_len (nsm->output_next_index_by_sw_if_index); i++)
694 if (nsm->output_next_index_by_sw_if_index[i] != ~0)
695 s = format (s, " %U %u\n", format_vnet_sw_if_index_name,
696 nsm->vnet_main, i, i);
701 s = format (s, " nsim not enabled\n");
707 static clib_error_t *
708 set_nsim_command_fn (vlib_main_t * vm,
709 unformat_input_t * input, vlib_cli_command_t * cmd)
711 f64 drop_fraction = 0.0, reorder_fraction = 0.0, delay, bandwidth;
712 u32 packets_per_drop, packets_per_reorder, packet_size = 1500;
713 nsim_main_t *nsm = &nsim_main;
716 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
718 if (unformat (input, "delay %U", unformat_delay, &delay))
720 else if (unformat (input, "bandwidth %U", unformat_bandwidth,
723 else if (unformat (input, "packet-size %u", &packet_size))
725 else if (unformat (input, "packets-per-drop %d", &packets_per_drop))
727 if (packets_per_drop > 0)
728 drop_fraction = 1.0 / ((f64) packets_per_drop);
730 else if (unformat (input, "packets-per-reorder %d",
731 &packets_per_reorder))
733 if (packets_per_reorder > 0)
734 reorder_fraction = 1.0 / ((f64) packets_per_reorder);
736 else if (unformat (input, "drop-fraction %f", &drop_fraction))
738 if (drop_fraction < 0.0 || drop_fraction > 1.0)
739 return clib_error_return
740 (0, "drop fraction must be between zero and 1");
742 else if (unformat (input, "reorder-fraction %f", &reorder_fraction))
744 if (reorder_fraction < 0.0 || reorder_fraction > 1.0)
745 return clib_error_return
746 (0, "reorder fraction must be between zero and 1");
748 else if (unformat (input, "poll-main-thread"))
749 nsm->poll_main_thread = 1;
754 rv = nsim_configure (nsm, bandwidth, delay, packet_size, drop_fraction,
759 case VNET_API_ERROR_INVALID_VALUE:
760 return clib_error_return (0, "invalid bandwidth %.2f", bandwidth);
762 case VNET_API_ERROR_INVALID_VALUE_2:
763 return clib_error_return (0, "invalid delay %.2f", delay);
765 case VNET_API_ERROR_INVALID_VALUE_3:
766 return clib_error_return (0, "invalid packet size %.2f", packet_size);
768 case VNET_API_ERROR_INVALID_VALUE_4:
769 return clib_error_return (0, "invalid reorder fraction %.3f for "
770 "delay %.2f", reorder_fraction, delay);
773 return clib_error_return (0, "error %d", rv);
779 vlib_cli_output (vm, "%U", format_nsim_config, 1);
785 * Configure the network simulation cross-connect
786 * Once the simulator is configured, use the "nsim enable-disable" command
787 * to set up a cross-connect with the supplied delay characteristics.
789 * The cross connect configuration may be changed without restarting vpp
790 * but it is good practice to shut down the interfaces.
793 * To configure the network delay simulator:
795 * set nsim delay 10.0 ms bandwidth 5.5 gbit packet-size 128
798 * @cliexcmd{set nsim delay <nn> bandwidth <bb> packet-size <nn>}
801 VLIB_CLI_COMMAND (set_nsim_command, static) =
804 .short_help = "set nsim delay <time> bandwidth <bps> packet-size <nbytes>\n"
805 " [packets-per-drop <nn>][drop-fraction <f64: 0.0 - 1.0>]",
806 .function = set_nsim_command_fn,
811 static clib_error_t *
812 show_nsim_command_fn (vlib_main_t * vm,
813 unformat_input_t * input, vlib_cli_command_t * cmd)
815 nsim_main_t *nsm = &nsim_main;
818 if (nsm->is_configured == 0)
819 return clib_error_return (0, "Network simulator not configured");
821 if (unformat (input, "verbose"))
824 vlib_cli_output (vm, "%U", format_nsim_config, verbose);
830 * Display state info for the network delay simulator.
833 * To display the state of the network simulator
836 * Network simulator cross-connects TenGigabitEthernet2/0/0 and TenGigabitEthernet2/0/1
837 * ...inserting link delay of 10.00 ms, 20.00 ms round-trip
838 * Configured bandwidth: 10.10 gbit/sec
839 * Configured packet size: 128
840 * Sim uses 157814784 bytes total
842 * @cliexcmd{show nsim}
846 VLIB_CLI_COMMAND (show_nsim_command, static) =
849 .short_help = "Display network delay simulator configuration",
850 .function = show_nsim_command_fn,
855 * fd.io coding-style-patch-verification: ON
858 * eval: (c-set-style "gnu")