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, u32 wheel_slots)
132 u32 pagesize = getpagesize ();
135 nsm->mmap_size = sizeof (nsim_wheel_t)
136 + wheel_slots * 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 = wheel_slots;
147 wp->entries = (void *) (wp + 1);
153 nsim_configure (nsim_main_t * nsm, f64 bandwidth, f64 delay, f64 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 < 64.0 || packet_size > 9000.0)
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;
205 vec_validate (nsm->wheel_by_thread, num_workers);
207 /* Initialize the output scheduler wheels */
208 i = (!nsm->poll_main_thread && num_workers) ? 1 : 0;
209 for (; i < num_workers + 1; i++)
210 nsm->wheel_by_thread[i] = nsim_wheel_alloc (nsm, wheel_slots_per_wrk);
212 vlib_worker_thread_barrier_sync (vm);
214 /* turn on the ring scrapers */
215 i = (!nsm->poll_main_thread && num_workers) ? 1 : 0;
216 for (; i < num_workers + 1; i++)
218 vlib_main_t *this_vm = vlib_mains[i];
220 vlib_node_set_state (this_vm, nsim_input_node.index,
221 VLIB_NODE_STATE_POLLING);
224 vlib_worker_thread_barrier_release (vm);
226 nsm->is_configured = 1;
231 * enable or disable the cross-connect
233 static clib_error_t *
234 nsim_cross_connect_enable_disable_command_fn (vlib_main_t * vm,
235 unformat_input_t * input,
236 vlib_cli_command_t * cmd)
238 nsim_main_t *nsm = &nsim_main;
239 unformat_input_t _line_input, *line_input = &_line_input;
240 u32 sw_if_index0 = ~0;
241 u32 sw_if_index1 = ~0;
242 int enable_disable = 1;
246 /* Get a line of input. */
247 if (!unformat_user (input, unformat_line_input, line_input))
250 while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
252 if (unformat (line_input, "disable"))
254 else if (unformat (line_input, "%U", unformat_vnet_sw_interface,
255 nsm->vnet_main, &tmp))
257 if (sw_if_index0 == ~0)
266 unformat_free (line_input);
268 if (sw_if_index0 == ~0 || sw_if_index1 == ~0)
269 return clib_error_return (0, "Please specify two interfaces...");
271 rv = nsim_cross_connect_enable_disable (nsm, sw_if_index0,
272 sw_if_index1, enable_disable);
279 case VNET_API_ERROR_CANNOT_ENABLE_DISABLE_FEATURE:
280 return clib_error_return (0, "Not configured, please 'set nsim' first");
282 case VNET_API_ERROR_INVALID_SW_IF_INDEX:
283 return clib_error_return
284 (0, "Invalid interface, only works on physical ports");
287 case VNET_API_ERROR_UNIMPLEMENTED:
288 return clib_error_return (0,
289 "Device driver doesn't support redirection");
293 return clib_error_return (0, "nsim_enable_disable returned %d", rv);
298 static clib_error_t *
299 nsim_config (vlib_main_t * vm, unformat_input_t * input)
301 nsim_main_t *nsm = &nsim_main;
303 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
305 if (unformat (input, "poll-main-thread"))
307 nsm->poll_main_thread = 1;
311 return clib_error_return (0, "unknown input '%U'",
312 format_unformat_error, input);
318 VLIB_CONFIG_FUNCTION (nsim_config, "nsim");
321 * Enable or disable network simulation cross-connect on two interfaces
322 * The network simulator must have already been configured, see
323 * the "nsim_configure" command.
325 * Place the interfaces into a bridge group, to ensure that
326 * interfaces are in promiscuous mode.
329 * To enable or disable network simulation cross-connect
331 * nsim cross-connect enable-disable TenGigabitEthernet2/0/0 TenGigabitEthernet2/0
332 * nsim cross-connect enable-disable TenGigabitEthernet2/0/0 TenGigabitEthernet2/0 disable
334 * @cliexcmd{nsim enable-disable <intfc> <intfc> [disable]}
337 VLIB_CLI_COMMAND (nsim_enable_disable_command, static) =
339 .path = "nsim cross-connect enable-disable",
341 "nsim cross-connect enable-disable <interface-name-1> "
342 "<interface-name-2> [disable]",
343 .function = nsim_cross_connect_enable_disable_command_fn,
347 /* API message handler */
348 static void vl_api_nsim_cross_connect_enable_disable_t_handler
349 (vl_api_nsim_cross_connect_enable_disable_t * mp)
351 vl_api_nsim_cross_connect_enable_disable_reply_t *rmp;
352 nsim_main_t *nsm = &nsim_main;
354 u32 sw_if_index0, sw_if_index1;
356 sw_if_index0 = clib_net_to_host_u32 (mp->sw_if_index0);
357 sw_if_index1 = clib_net_to_host_u32 (mp->sw_if_index1);
359 if (!vnet_sw_if_index_is_api_valid (sw_if_index0))
361 rv = VNET_API_ERROR_INVALID_SW_IF_INDEX;
362 goto bad_sw_if_index;
364 if (!vnet_sw_if_index_is_api_valid (sw_if_index1))
366 rv = VNET_API_ERROR_INVALID_SW_IF_INDEX_2;
367 goto bad_sw_if_index;
370 rv = nsim_cross_connect_enable_disable (nsm, sw_if_index0, sw_if_index1,
371 (int) (mp->enable_disable));
373 BAD_SW_IF_INDEX_LABEL;
374 REPLY_MACRO (VL_API_NSIM_CROSS_CONNECT_ENABLE_DISABLE_REPLY);
377 /* API message handler */
378 static void vl_api_nsim_output_feature_enable_disable_t_handler
379 (vl_api_nsim_output_feature_enable_disable_t * mp)
381 vl_api_nsim_output_feature_enable_disable_reply_t *rmp;
382 nsim_main_t *nsm = &nsim_main;
384 VALIDATE_SW_IF_INDEX (mp);
386 rv = nsim_output_feature_enable_disable (nsm, ntohl (mp->sw_if_index),
387 (int) (mp->enable_disable));
389 BAD_SW_IF_INDEX_LABEL;
390 REPLY_MACRO (VL_API_NSIM_OUTPUT_FEATURE_ENABLE_DISABLE_REPLY);
393 /* API message handler */
395 vl_api_nsim_configure_t_handler (vl_api_nsim_configure_t * mp)
397 vl_api_nsim_configure_reply_t *rmp;
398 nsim_main_t *nsm = &nsim_main;
399 f64 delay, bandwidth, packet_size, drop_fraction = 0.0, reorder_rate = 0.0;
400 u32 packets_per_drop;
403 delay = ((f64) (ntohl (mp->delay_in_usec))) * 1e-6;
404 bandwidth = (f64) (clib_net_to_host_u64 (mp->bandwidth_in_bits_per_second));
405 packet_size = (f64) (ntohl (mp->average_packet_size));
407 packets_per_drop = ntohl (mp->packets_per_drop);
408 if (packets_per_drop > 0)
409 drop_fraction = 1.0 / (f64) (packets_per_drop);
411 rv = nsim_configure (nsm, bandwidth, delay, packet_size, drop_fraction,
414 REPLY_MACRO (VL_API_NSIM_CONFIGURE_REPLY);
418 vl_api_nsim_configure2_t_handler (vl_api_nsim_configure2_t * mp)
420 vl_api_nsim_configure_reply_t *rmp;
421 nsim_main_t *nsm = &nsim_main;
422 f64 delay, bandwidth, packet_size, drop_fraction = 0.0, reorder_rate = 0.0;
423 u32 packets_per_drop, packets_per_reorder;
426 delay = ((f64) (ntohl (mp->delay_in_usec))) * 1e-6;
427 bandwidth = (f64) (clib_net_to_host_u64 (mp->bandwidth_in_bits_per_second));
428 packet_size = (f64) (ntohl (mp->average_packet_size));
430 packets_per_drop = ntohl (mp->packets_per_drop);
431 if (packets_per_drop > 0)
432 drop_fraction = 1.0 / (f64) (packets_per_drop);
434 packets_per_reorder = ntohl (mp->packets_per_reorder);
435 if (packets_per_reorder > 0)
436 reorder_rate = 1.0 / (f64) packets_per_reorder;
438 rv = nsim_configure (nsm, bandwidth, delay, packet_size, drop_fraction,
441 REPLY_MACRO (VL_API_NSIM_CONFIGURE2_REPLY);
446 * enable or disable the output_feature
448 static clib_error_t *
449 nsim_output_feature_enable_disable_command_fn (vlib_main_t * vm,
450 unformat_input_t * input,
451 vlib_cli_command_t * cmd)
453 nsim_main_t *nsm = &nsim_main;
454 unformat_input_t _line_input, *line_input = &_line_input;
455 u32 sw_if_index = ~0;
456 int enable_disable = 1;
459 /* Get a line of input. */
460 if (!unformat_user (input, unformat_line_input, line_input))
463 while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
465 if (unformat (line_input, "disable"))
467 else if (unformat (line_input, "%U", unformat_vnet_sw_interface,
468 nsm->vnet_main, &sw_if_index))
472 clib_error_t *error = clib_error_return (0, "unknown input `%U'",
473 format_unformat_error,
475 unformat_free (line_input);
480 unformat_free (line_input);
482 if (sw_if_index == ~0)
483 return clib_error_return (0, "Please specify one interface...");
485 rv = nsim_output_feature_enable_disable (nsm, sw_if_index, enable_disable);
492 case VNET_API_ERROR_CANNOT_ENABLE_DISABLE_FEATURE:
493 return clib_error_return (0, "Not configured, please 'set nsim' first");
495 case VNET_API_ERROR_INVALID_SW_IF_INDEX:
496 return clib_error_return
497 (0, "Invalid interface, only works on physical ports");
500 case VNET_API_ERROR_UNIMPLEMENTED:
501 return clib_error_return (0,
502 "Device driver doesn't support redirection");
506 return clib_error_return
507 (0, "nsim_output_feature_enable_disable returned %d", rv);
513 * Enable or disable network simulation output feature on an interface
514 * The network simulator must have already been configured, see
515 * the "nsim_configure" command.
518 * To enable or disable network simulation output feature
520 * nsim output-feature enable-disable TenGigabitEthernet2/0/0
521 * nsim output-feature enable-disable TenGigabitEthernet2/0/0 disable
523 * @cliexcmd{nsim output-feature enable-disable <intfc> [disable]}
526 VLIB_CLI_COMMAND (nsim_output_feature_enable_disable_command, static) =
528 .path = "nsim output-feature enable-disable",
530 "nsim output-feature enable-disable <interface-name> [disable]",
531 .function = nsim_output_feature_enable_disable_command_fn,
535 #include <nsim/nsim.api.c>
536 static clib_error_t *
537 nsim_init (vlib_main_t * vm)
539 nsim_main_t *nsm = &nsim_main;
542 nsm->vnet_main = vnet_get_main ();
544 /* Ask for a correctly-sized block of API message decode slots */
545 nsm->msg_id_base = setup_message_id_table ();
546 nsm->arc_index = nsm->vnet_main->interface_main.output_feature_arc_index;
550 VLIB_INIT_FUNCTION (nsim_init);
553 VNET_FEATURE_INIT (nsim, static) =
555 .arc_name = "device-input",
557 .runs_before = VNET_FEATURES ("ethernet-input"),
562 VNET_FEATURE_INIT (nsim_feature, static) =
564 .arc_name = "interface-output",
565 .node_name = "nsim-output-feature",
566 .runs_before = VNET_FEATURES ("interface-tx"),
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))
612 format_nsim_config (u8 * s, va_list * args)
614 int verbose = va_arg (*args, int);
615 nsim_main_t *nsm = &nsim_main;
617 s = format (s, "configuration\n");
618 s = format (s, " delay (ms): %.2f\n", nsm->delay * 1e3);
619 if (nsm->drop_fraction)
620 s = format (s, " drop fraction: %.5f\n", nsm->drop_fraction);
622 s = format (s, " drop fraction: 0\n");
623 if (nsm->reorder_fraction)
624 s = format (s, " reorder fraction: %.5f\n", nsm->reorder_fraction);
626 s = format (s, " reorder fraction: 0\n");
627 s = format (s, " packet size: %u\n", nsm->packet_size);
628 s = format (s, " throughput (Gbps): %.2f\n", nsm->bandwidth / 1e9);
632 s = format (s, " poll main thread: %u\n", nsm->poll_main_thread);
633 s = format (s, " memory: %U bytes per thread %U bytes total\n",
634 format_memory_size, nsm->mmap_size, format_memory_size,
635 nsm->mmap_size * vlib_num_workers ());
638 s = format (s, "\n");
640 if (nsm->sw_if_index0 != 0)
642 s = format (s, "cross-connect\n %U and %U\n",
643 format_vnet_sw_if_index_name, nsm->vnet_main,
644 nsm->sw_if_index0, format_vnet_sw_if_index_name,
645 nsm->vnet_main, nsm->sw_if_index1);
647 else if (vec_len (nsm->output_next_index_by_sw_if_index))
650 s = format (s, "output feature arcs to:\n");
651 for (i = 0; i < vec_len (nsm->output_next_index_by_sw_if_index); i++)
653 if (nsm->output_next_index_by_sw_if_index[i] != ~0)
654 s = format (s, " %U %u\n", format_vnet_sw_if_index_name,
655 nsm->vnet_main, i, i);
660 s = format (s, " nsim not enabled\n");
666 static clib_error_t *
667 set_nsim_command_fn (vlib_main_t * vm,
668 unformat_input_t * input, vlib_cli_command_t * cmd)
670 f64 drop_fraction = 0.0, reorder_fraction = 0.0;
671 f64 delay, bandwidth, packet_size = 1500.0;
672 u32 packets_per_drop, packets_per_reorder;
673 nsim_main_t *nsm = &nsim_main;
676 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
678 if (unformat (input, "delay %U", unformat_delay, &delay))
680 else if (unformat (input, "bandwidth %U", unformat_bandwidth,
683 else if (unformat (input, "packet-size %f", &packet_size))
685 else if (unformat (input, "packets-per-drop %d", &packets_per_drop))
687 if (packets_per_drop > 0)
688 drop_fraction = 1.0 / ((f64) packets_per_drop);
690 else if (unformat (input, "packets-per-reorder %d",
691 &packets_per_reorder))
693 if (packets_per_reorder > 0)
694 reorder_fraction = 1.0 / ((f64) packets_per_reorder);
696 else if (unformat (input, "drop-fraction %f", &drop_fraction))
698 if (drop_fraction < 0.0 || drop_fraction > 1.0)
699 return clib_error_return
700 (0, "drop fraction must be between zero and 1");
702 else if (unformat (input, "reorder-fraction %f", &reorder_fraction))
704 if (reorder_fraction < 0.0 || reorder_fraction > 1.0)
705 return clib_error_return
706 (0, "reorder fraction must be between zero and 1");
708 else if (unformat (input, "poll-main-thread"))
709 nsm->poll_main_thread = 1;
714 rv = nsim_configure (nsm, bandwidth, delay, packet_size, drop_fraction,
719 case VNET_API_ERROR_INVALID_VALUE:
720 return clib_error_return (0, "invalid bandwidth %.2f", bandwidth);
722 case VNET_API_ERROR_INVALID_VALUE_2:
723 return clib_error_return (0, "invalid delay %.2f", delay);
725 case VNET_API_ERROR_INVALID_VALUE_3:
726 return clib_error_return (0, "invalid packet size %.2f", packet_size);
728 case VNET_API_ERROR_INVALID_VALUE_4:
729 return clib_error_return (0, "invalid reorder fraction %.3f for "
730 "delay %.2f", reorder_fraction, delay);
733 return clib_error_return (0, "error %d", rv);
739 vlib_cli_output (vm, "%U", format_nsim_config, 1);
745 * Configure the network simulation cross-connect
746 * Once the simulator is configured, use the "nsim enable-disable" command
747 * to set up a cross-connect with the supplied delay characteristics.
749 * The cross connect configuration may be changed without restarting vpp
750 * but it is good practice to shut down the interfaces.
753 * To configure the network delay simulator:
755 * set nsim delay 10.0 ms bandwidth 5.5 gbit packet-size 128
758 * @cliexcmd{set nsim delay <nn> bandwidth <bb> packet-size <nn>}
761 VLIB_CLI_COMMAND (set_nsim_command, static) =
764 .short_help = "set nsim delay <time> bandwidth <bps> packet-size <nbytes>\n"
765 " [packets-per-drop <nn>][drop-fraction <f64: 0.0 - 1.0>]",
766 .function = set_nsim_command_fn,
771 static clib_error_t *
772 show_nsim_command_fn (vlib_main_t * vm,
773 unformat_input_t * input, vlib_cli_command_t * cmd)
775 nsim_main_t *nsm = &nsim_main;
778 if (nsm->is_configured == 0)
779 return clib_error_return (0, "Network simulator not configured");
781 if (unformat (input, "verbose"))
784 vlib_cli_output (vm, "%U", format_nsim_config, verbose);
790 * Display state info for the network delay simulator.
793 * To display the state of the network simulator
796 * Network simulator cross-connects TenGigabitEthernet2/0/0 and TenGigabitEthernet2/0/1
797 * ...inserting link delay of 10.00 ms, 20.00 ms round-trip
798 * Configured bandwidth: 10.10 gbit/sec
799 * Configured packet size: 128
800 * Sim uses 157814784 bytes total
802 * @cliexcmd{show nsim}
806 VLIB_CLI_COMMAND (show_nsim_command, static) =
809 .short_help = "Display network delay simulator configuration",
810 .function = show_nsim_command_fn,
815 * fd.io coding-style-patch-verification: ON
818 * eval: (c-set-style "gnu")