/*
 * Copyright (c) 2017-2018 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.
 */

#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <time.h>
#include <arpa/inet.h>
#include <vcl/vcl_test.h>
#include <pthread.h>

typedef struct
{
  vcl_test_session_t *sessions;
  uint32_t n_sessions;
  uint32_t wrk_index;
  fd_set wr_fdset;
  fd_set rd_fdset;
  int max_fd_index;
  pthread_t thread_handle;
  vcl_test_cfg_t cfg;
} vcl_test_client_worker_t;

typedef struct
{
  vcl_test_client_worker_t *workers;
  vppcom_endpt_t server_endpt;
  uint32_t cfg_seq_num;
  vcl_test_session_t ctrl_session;
  vcl_test_session_t *sessions;
  uint8_t dump_cfg;
  vcl_test_t post_test;
  uint32_t proto;
  uint32_t n_workers;
  volatile int active_workers;
  struct sockaddr_storage server_addr;
} vcl_test_client_main_t;

static __thread int __wrk_index = 0;

vcl_test_client_main_t vcl_client_main;

#define vtc_min(a, b) (a < b ? a : b)
#define vtc_max(a, b) (a > b ? a : b)

static int
vtc_cfg_sync (vcl_test_session_t * ts)
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  vcl_test_cfg_t *rx_cfg = (vcl_test_cfg_t *) ts->rxbuf;
  int rx_bytes, tx_bytes;

  vt_atomic_add (&ts->cfg.seq_num, 1);
  if (ts->cfg.verbose)
    {
      vtinf ("(fd %d): Sending config to server.", ts->fd);
      vcl_test_cfg_dump (&ts->cfg, 1 /* is_client */ );
    }
  tx_bytes = vcl_test_write (ts->fd, (uint8_t *) & ts->cfg,
			     sizeof (ts->cfg), NULL, ts->cfg.verbose);
  if (tx_bytes < 0)
    {
      vtwrn ("(fd %d): write test cfg failed (%d)!", ts->fd, tx_bytes);
      return tx_bytes;
    }

  rx_bytes = vcl_test_read (ts->fd, (uint8_t *) ts->rxbuf,
			    sizeof (vcl_test_cfg_t), NULL);
  if (rx_bytes < 0)
    return rx_bytes;

  if (rx_cfg->magic != VCL_TEST_CFG_CTRL_MAGIC)
    {
      vtwrn ("(fd %d): Bad server reply cfg -- aborting!", ts->fd);
      return -1;
    }
  if ((rx_bytes != sizeof (vcl_test_cfg_t))
      || !vcl_test_cfg_verify (rx_cfg, &ts->cfg))
    {
      vtwrn ("(fd %d): Invalid config received from server!", ts->fd);
      if (rx_bytes != sizeof (vcl_test_cfg_t))
	{
	  vtinf ("\tRx bytes %d != cfg size %lu", rx_bytes,
		 sizeof (vcl_test_cfg_t));
	}
      else
	{
	  vcl_test_cfg_dump (rx_cfg, 1 /* is_client */ );
	  vtinf ("(fd %d): Valid config sent to server.", ts->fd);
	  vcl_test_cfg_dump (&ts->cfg, 1 /* is_client */ );
	}
      return -1;
    }
  if (ts->cfg.verbose)
    {
      vtinf ("(fd %d): Got config back from server.", ts->fd);
      vcl_test_cfg_dump (rx_cfg, 1 /* is_client */ );
    }

  return 0;
}

static int
vtc_connect_test_sessions (vcl_test_client_worker_t * wrk)
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  vcl_test_session_t *ts;
  uint32_t n_test_sessions;
  int i, rv;

  n_test_sessions = wrk->cfg.num_test_sessions;
  if (n_test_sessions < 1)
    {
      errno = EINVAL;
      return -1;
    }

  if (wrk->n_sessions >= n_test_sessions)
    goto done;

  if (wrk->n_sessions)
    wrk->sessions = realloc (wrk->sessions,
			     n_test_sessions * sizeof (vcl_test_session_t));
  else
    wrk->sessions = calloc (n_test_sessions, sizeof (vcl_test_session_t));

  if (!wrk->sessions)
    {
      vterr ("failed to alloc sessions", -errno);
      return errno;
    }

  for (i = 0; i < n_test_sessions; i++)
    {
      ts = &wrk->sessions[i];
      ts->fd = vppcom_session_create (vcm->proto, 1 /* is_nonblocking */ );
      if (ts->fd < 0)
	{
	  vterr ("vppcom_session_create()", ts->fd);
	  return ts->fd;
	}

      rv = vppcom_session_connect (ts->fd, &vcm->server_endpt);
      if (rv < 0)
	{
	  vterr ("vppcom_session_connect()", rv);
	  return rv;
	}
      vtinf ("Test session %d (fd %d) connected.", i, ts->fd);
    }
  wrk->n_sessions = n_test_sessions;

done:
  vtinf ("All test sessions (%d) connected!", n_test_sessions);
  return 0;
}

static int
vtc_worker_test_setup (vcl_test_client_worker_t * wrk)
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  vcl_test_session_t *ctrl = &vcm->ctrl_session;
  vcl_test_cfg_t *cfg = &wrk->cfg;
  vcl_test_session_t *ts;
  uint32_t sidx;
  int i, j;

  FD_ZERO (&wrk->wr_fdset);
  FD_ZERO (&wrk->rd_fdset);

  for (i = 0; i < cfg->num_test_sessions; i++)
    {
      ts = &wrk->sessions[i];
      ts->cfg = wrk->cfg;
      vcl_test_session_buf_alloc (ts);

      switch (cfg->test)
	{
	case VCL_TEST_TYPE_ECHO:
	  memcpy (ts->txbuf, ctrl->txbuf, cfg->total_bytes);
	  break;
	case VCL_TEST_TYPE_UNI:
	case VCL_TEST_TYPE_BI:
	  for (j = 0; j < ts->txbuf_size; j++)
	    ts->txbuf[j] = j & 0xff;
	  break;
	}

      FD_SET (vppcom_session_index (ts->fd), &wrk->wr_fdset);
      FD_SET (vppcom_session_index (ts->fd), &wrk->rd_fdset);
      sidx = vppcom_session_index (ts->fd);
      wrk->max_fd_index = vtc_max (sidx, wrk->max_fd_index);
    }
  wrk->max_fd_index += 1;

  return 0;
}

static int
vtc_worker_init (vcl_test_client_worker_t * wrk)
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  vcl_test_session_t *ctrl = &vcm->ctrl_session;
  vcl_test_cfg_t *cfg = &wrk->cfg;
  vcl_test_session_t *ts;
  uint32_t i, n;
  int rv, nbytes;

  __wrk_index = wrk->wrk_index;

  vtinf ("Initializing worker %u ...", wrk->wrk_index);

  if (wrk->wrk_index)
    {
      if (vppcom_worker_register ())
	{
	  vtwrn ("failed to register worker");
	  return -1;
	}
      vt_atomic_add (&vcm->active_workers, 1);
    }
  rv = vtc_connect_test_sessions (wrk);
  if (rv)
    {
      vterr ("vtc_connect_test_sessions ()", rv);
      return rv;
    }

  if (vtc_worker_test_setup (wrk))
    return -1;

  vtinf ("Sending config to server on all sessions ...");

  for (n = 0; n < cfg->num_test_sessions; n++)
    {
      ts = &wrk->sessions[n];
      if (vtc_cfg_sync (ts))
	return -1;
      memset (&ts->stats, 0, sizeof (ts->stats));
    }

  return 0;
}

static int stats_lock = 0;

static void
vtc_accumulate_stats (vcl_test_client_worker_t * wrk,
		      vcl_test_session_t * ctrl)
{
  vcl_test_session_t *ts;
  static char buf[64];
  int i, show_rx = 0;

  while (__sync_lock_test_and_set (&stats_lock, 1))
    ;

  if (ctrl->cfg.test == VCL_TEST_TYPE_BI
      || ctrl->cfg.test == VCL_TEST_TYPE_ECHO)
    show_rx = 1;

  for (i = 0; i < wrk->cfg.num_test_sessions; i++)
    {
      ts = &wrk->sessions[i];
      ts->stats.start = ctrl->stats.start;

      if (ctrl->cfg.verbose > 1)
	{
	  sprintf (buf, "CLIENT (fd %d) RESULTS", ts->fd);
	  vcl_test_stats_dump (buf, &ts->stats, show_rx, 1 /* show tx */ ,
			       ctrl->cfg.verbose);
	}

      vcl_test_stats_accumulate (&ctrl->stats, &ts->stats);
      if (vcl_comp_tspec (&ctrl->stats.stop, &ts->stats.stop) < 0)
	ctrl->stats.stop = ts->stats.stop;
    }

  __sync_lock_release (&stats_lock);
}

static void
vtc_worker_sessions_exit (vcl_test_client_worker_t * wrk)
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  vcl_test_session_t *ctrl = &vcm->ctrl_session;
  vcl_test_session_t *ts;
  int i, verbose = ctrl->cfg.verbose;

  for (i = 0; i < wrk->cfg.num_test_sessions; i++)
    {
      ts = &wrk->sessions[i];
      ts->cfg.test = VCL_TEST_TYPE_EXIT;

      if (verbose)
	{
	  vtinf ("(fd %d): Sending exit cfg to server...", ts->fd);
	  vcl_test_cfg_dump (&ts->cfg, 1 /* is_client */ );
	}
      (void) vcl_test_write (ts->fd, (uint8_t *) & ts->cfg,
			     sizeof (ts->cfg), &ts->stats, verbose);
    }
  wrk->n_sessions = 0;
}

static void *
vtc_worker_loop (void *arg)
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  vcl_test_session_t *ctrl = &vcm->ctrl_session;
  vcl_test_client_worker_t *wrk = arg;
  uint32_t n_active_sessions, n_bytes;
  fd_set _wfdset, *wfdset = &_wfdset;
  fd_set _rfdset, *rfdset = &_rfdset;
  vcl_test_session_t *ts;
  int i, rv, check_rx = 0;

  rv = vtc_worker_init (wrk);
  if (rv)
    {
      vterr ("vtc_worker_init()", rv);
      return 0;
    }

  vtinf ("Starting test ...");

  if (wrk->wrk_index == 0)
    clock_gettime (CLOCK_REALTIME, &ctrl->stats.start);

  check_rx = wrk->cfg.test != VCL_TEST_TYPE_UNI;
  n_active_sessions = wrk->cfg.num_test_sessions;
  while (n_active_sessions)
    {
      _wfdset = wrk->wr_fdset;
      _rfdset = wrk->rd_fdset;

      rv = vppcom_select (wrk->max_fd_index, (uint64_t *) rfdset,
			  (uint64_t *) wfdset, NULL, 0);
      if (rv < 0)
	{
	  vterr ("vppcom_select()", rv);
	  goto exit;
	}
      else if (rv == 0)
	continue;

      for (i = 0; i < wrk->cfg.num_test_sessions; i++)
	{
	  ts = &wrk->sessions[i];
	  if (!((ts->stats.stop.tv_sec == 0) &&
		(ts->stats.stop.tv_nsec == 0)))
	    continue;

	  if (FD_ISSET (vppcom_session_index (ts->fd), rfdset)
	      && ts->stats.rx_bytes < ts->cfg.total_bytes)
	    {
	      (void) vcl_test_read (ts->fd, (uint8_t *) ts->rxbuf,
				    ts->rxbuf_size, &ts->stats);
	    }

	  if (FD_ISSET (vppcom_session_index (ts->fd), wfdset)
	      && ts->stats.tx_bytes < ts->cfg.total_bytes)
	    {
	      n_bytes = ts->cfg.txbuf_size;
	      if (ts->cfg.test == VCL_TEST_TYPE_ECHO)
		n_bytes = strlen (ctrl->txbuf) + 1;
	      rv = vcl_test_write (ts->fd, (uint8_t *) ts->txbuf,
				   n_bytes, &ts->stats, ts->cfg.verbose);
	      if (rv < 0)
		{
		  vtwrn ("vppcom_test_write (%d) failed -- aborting test",
			 ts->fd);
		  goto exit;
		}
	    }

	  if ((!check_rx && ts->stats.tx_bytes >= ts->cfg.total_bytes)
	      || (check_rx && ts->stats.rx_bytes >= ts->cfg.total_bytes))
	    {
	      clock_gettime (CLOCK_REALTIME, &ts->stats.stop);
	      n_active_sessions--;
	    }
	}
    }
exit:
  vtinf ("Worker %d done ...", wrk->wrk_index);
  if (wrk->cfg.test != VCL_TEST_TYPE_ECHO)
    vtc_accumulate_stats (wrk, ctrl);
  sleep (VCL_TEST_DELAY_DISCONNECT);
  vtc_worker_sessions_exit (wrk);
  if (wrk->wrk_index)
    vt_atomic_add (&vcm->active_workers, -1);
  return 0;
}

static void
vtc_print_stats (vcl_test_session_t * ctrl)
{
  int is_echo = ctrl->cfg.test == VCL_TEST_TYPE_ECHO;
  int show_rx = 0;
  char buf[64];

  if (ctrl->cfg.test == VCL_TEST_TYPE_BI
      || ctrl->cfg.test == VCL_TEST_TYPE_ECHO)
    show_rx = 1;

  vcl_test_stats_dump ("CLIENT RESULTS", &ctrl->stats,
		       show_rx, 1 /* show tx */ ,
		       ctrl->cfg.verbose);
  vcl_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );

  if (ctrl->cfg.verbose)
    {
      vtinf ("  ctrl session info\n"
	     VCL_TEST_SEPARATOR_STRING
	     "          fd:  %d (0x%08x)\n"
	     "       rxbuf:  %p\n"
	     "  rxbuf size:  %u (0x%08x)\n"
	     "       txbuf:  %p\n"
	     "  txbuf size:  %u (0x%08x)\n"
	     VCL_TEST_SEPARATOR_STRING,
	     ctrl->fd, (uint32_t) ctrl->fd,
	     ctrl->rxbuf, ctrl->rxbuf_size, ctrl->rxbuf_size,
	     ctrl->txbuf, ctrl->txbuf_size, ctrl->txbuf_size);
    }

  if (is_echo)
    sprintf (buf, "Echo");
  else
    sprintf (buf, "%s-directional Stream",
	     ctrl->cfg.test == VCL_TEST_TYPE_BI ? "Bi" : "Uni");
}

static void
vtc_echo_client (vcl_test_client_main_t * vcm)
{
  vcl_test_client_worker_t *wrk;
  vcl_test_session_t *ctrl = &vcm->ctrl_session;
  vcl_test_cfg_t *cfg = &ctrl->cfg;

  cfg->total_bytes = strlen (ctrl->txbuf) + 1;
  memset (&ctrl->stats, 0, sizeof (ctrl->stats));

  /* Echo works with only one worker */
  wrk = vcm->workers;
  wrk->wrk_index = 0;
  wrk->cfg = *cfg;

  vtc_worker_loop (wrk);

  /* Not relevant for echo test
     clock_gettime (CLOCK_REALTIME, &ctrl->stats.stop);
     vtc_accumulate_stats (wrk, ctrl);
     vtc_print_stats (ctrl);
   */
}

static void
vtc_stream_client (vcl_test_client_main_t * vcm)
{
  vcl_test_session_t *ctrl = &vcm->ctrl_session;
  vcl_test_cfg_t *cfg = &ctrl->cfg;
  vcl_test_client_worker_t *wrk;
  vcl_test_session_t *ts;
  int tx_bytes, rv;
  uint32_t i, n, sidx, n_conn, n_conn_per_wrk;

  vtinf ("%s-directional Stream Test Starting!",
	 ctrl->cfg.test == VCL_TEST_TYPE_BI ? "Bi" : "Uni");

  cfg->total_bytes = cfg->num_writes * cfg->txbuf_size;
  cfg->ctrl_handle = ~0;
  if (vtc_cfg_sync (ctrl))
    {
      vtwrn ("test cfg sync failed -- aborting!");
      return;
    }
  cfg->ctrl_handle = ((vcl_test_cfg_t *) ctrl->rxbuf)->ctrl_handle;
  memset (&ctrl->stats, 0, sizeof (ctrl->stats));

  n_conn = cfg->num_test_sessions;
  n_conn_per_wrk = n_conn / vcm->n_workers;
  for (i = 0; i < vcm->n_workers; i++)
    {
      wrk = &vcm->workers[i];
      wrk->wrk_index = i;
      wrk->cfg = ctrl->cfg;
      wrk->cfg.num_test_sessions = vtc_min (n_conn_per_wrk, n_conn);
      n_conn -= wrk->cfg.num_test_sessions;
    }

  for (i = 1; i < vcm->n_workers; i++)
    {
      wrk = &vcm->workers[i];
      pthread_create (&wrk->thread_handle, NULL, vtc_worker_loop,
		      (void *) wrk);
    }
  vtc_worker_loop (&vcm->workers[0]);

  while (vcm->active_workers > 0)
    ;

  vtinf ("Sending config on ctrl session (fd %d) for stats...", ctrl->fd);
  if (vtc_cfg_sync (ctrl))
    {
      vtwrn ("test cfg sync failed -- aborting!");
      return;
    }

  vtc_print_stats (ctrl);

  ctrl->cfg.test = VCL_TEST_TYPE_ECHO;
  ctrl->cfg.total_bytes = 0;
  if (vtc_cfg_sync (ctrl))
    vtwrn ("post-test cfg sync failed!");
}

static void
dump_help (void)
{
#define INDENT "\n  "

  printf ("CLIENT: Test configuration commands:"
	  INDENT VCL_TEST_TOKEN_HELP
	  "\t\t\tDisplay help."
	  INDENT VCL_TEST_TOKEN_EXIT
	  "\t\t\tExit test client & server."
	  INDENT VCL_TEST_TOKEN_SHOW_CFG
	  "\t\t\tShow the current test cfg."
	  INDENT VCL_TEST_TOKEN_RUN_UNI
	  "\t\t\tRun the Uni-directional test."
	  INDENT VCL_TEST_TOKEN_RUN_BI
	  "\t\t\tRun the Bi-directional test."
	  INDENT VCL_TEST_TOKEN_VERBOSE
	  "\t\t\tToggle verbose setting."
	  INDENT VCL_TEST_TOKEN_RXBUF_SIZE
	  "<rxbuf size>\tRx buffer size (bytes)."
	  INDENT VCL_TEST_TOKEN_TXBUF_SIZE
	  "<txbuf size>\tTx buffer size (bytes)."
	  INDENT VCL_TEST_TOKEN_NUM_WRITES
	  "<# of writes>\tNumber of txbuf writes to server." "\n");
}

static void
cfg_txbuf_size_set (void)
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  vcl_test_session_t *ctrl = &vcm->ctrl_session;
  char *p = ctrl->txbuf + strlen (VCL_TEST_TOKEN_TXBUF_SIZE);
  uint64_t txbuf_size = strtoull ((const char *) p, NULL, 10);

  if (txbuf_size >= VCL_TEST_CFG_BUF_SIZE_MIN)
    {
      ctrl->cfg.txbuf_size = txbuf_size;
      ctrl->cfg.total_bytes = ctrl->cfg.num_writes * ctrl->cfg.txbuf_size;
      vcl_test_buf_alloc (&ctrl->cfg, 0 /* is_rxbuf */ ,
			  (uint8_t **) & ctrl->txbuf, &ctrl->txbuf_size);
      vcl_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );
    }
  else
    vtwrn ("Invalid txbuf size (%lu) < minimum buf size (%u)!",
	   txbuf_size, VCL_TEST_CFG_BUF_SIZE_MIN);
}

static void
cfg_num_writes_set (void)
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  vcl_test_session_t *ctrl = &vcm->ctrl_session;
  char *p = ctrl->txbuf + strlen (VCL_TEST_TOKEN_NUM_WRITES);
  uint32_t num_writes = strtoul ((const char *) p, NULL, 10);

  if (num_writes > 0)
    {
      ctrl->cfg.num_writes = num_writes;
      ctrl->cfg.total_bytes = ctrl->cfg.num_writes * ctrl->cfg.txbuf_size;
      vcl_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );
    }
  else
    {
      vtwrn ("invalid num writes: %u", num_writes);
    }
}

static void
cfg_num_test_sessions_set (void)
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  vcl_test_session_t *ctrl = &vcm->ctrl_session;
  char *p = ctrl->txbuf + strlen (VCL_TEST_TOKEN_NUM_TEST_SESS);
  uint32_t num_test_sessions = strtoul ((const char *) p, NULL, 10);

  if ((num_test_sessions > 0) &&
      (num_test_sessions <= VCL_TEST_CFG_MAX_TEST_SESS))
    {
      ctrl->cfg.num_test_sessions = num_test_sessions;
      vcl_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );
    }
  else
    {
      vtwrn ("invalid num test sessions: %u, (%d max)",
	     num_test_sessions, VCL_TEST_CFG_MAX_TEST_SESS);
    }
}

static void
cfg_rxbuf_size_set (void)
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  vcl_test_session_t *ctrl = &vcm->ctrl_session;
  char *p = ctrl->txbuf + strlen (VCL_TEST_TOKEN_RXBUF_SIZE);
  uint64_t rxbuf_size = strtoull ((const char *) p, NULL, 10);

  if (rxbuf_size >= VCL_TEST_CFG_BUF_SIZE_MIN)
    {
      ctrl->cfg.rxbuf_size = rxbuf_size;
      vcl_test_buf_alloc (&ctrl->cfg, 1 /* is_rxbuf */ ,
			  (uint8_t **) & ctrl->rxbuf, &ctrl->rxbuf_size);
      vcl_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );
    }
  else
    vtwrn ("Invalid rxbuf size (%lu) < minimum buf size (%u)!",
	   rxbuf_size, VCL_TEST_CFG_BUF_SIZE_MIN);
}

static void
cfg_verbose_toggle (void)
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  vcl_test_session_t *ctrl = &vcm->ctrl_session;

  ctrl->cfg.verbose = ctrl->cfg.verbose ? 0 : 1;
  vcl_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );

}

static vcl_test_t
parse_input ()
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  vcl_test_session_t *ctrl = &vcm->ctrl_session;
  vcl_tes<style>
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</style><div class="highlight"><pre><span></span><span class="cm">/*</span>
<span class="cm"> * Copyright (c) 2015 Cisco and/or its affiliates.</span>
<span class="cm"> * Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);</span>
<span class="cm"> * you may not use this file except in compliance with the License.</span>
<span class="cm"> * You may obtain a copy of the License at:</span>
<span class="cm"> *</span>
<span class="cm"> *     http://www.apache.org/licenses/LICENSE-2.0</span>
<span class="cm"> *</span>
<span class="cm"> * Unless required by applicable law or agreed to in writing, software</span>
<span class="cm"> * distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span>
<span class="cm"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<span class="cm"> * See the License for the specific language governing permissions and</span>
<span class="cm"> * limitations under the License.</span>
<span class="cm"> */</span>

<span class="cp">#include</span> <span class="cpf">&lt;vnet/vnet.h&gt;</span><span class="cp"></span>
<span class="cp">#include</span> <span class="cpf">&lt;vnet/devices/devices.h&gt;</span><span class="cp"></span>
<span class="cp">#include</span> <span class="cpf">&lt;vnet/feature/feature.h&gt;</span><span class="cp"></span>
<span class="cp">#include</span> <span class="cpf">&lt;vnet/ip/ip.h&gt;</span><span class="cp"></span>
<span class="cp">#include</span> <span class="cpf">&lt;vnet/ethernet/ethernet.h&gt;</span><span class="cp"></span>

<span class="n">vnet_device_main_t</span> <span class="n">vnet_device_main</span><span class="p">;</span>

<span class="k">static</span> <span class="n">uword</span>
<span class="nf">device_input_fn</span> <span class="p">(</span><span class="n">vlib_main_t</span> <span class="o">*</span> <span class="n">vm</span><span class="p">,</span> <span class="n">vlib_node_runtim