build-root/emacs-lisp/plugin-main-skel.el

;;; plugin-main-skel.el - vpp engine plug-in "main.c" skeleton
;;;
;;; Copyright (c) 2016 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.

(require 'skeleton)

(define-skeleton skel-plugin-main
"Insert a plug-in 'main.c' skeleton "
nil
'(if (not (boundp 'plugin-name))
     (setq plugin-name (read-string "Plugin name: ")))
'(setq PLUGIN-NAME (upcase plugin-name))
"
/*
 * " plugin-name ".c - skeleton vpp engine plug-in 
 *
 * Copyright (c) <current-year> <your-organization>
 * 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 <vnet/vnet.h>
#include <vnet/plugin/plugin.h>
#include <" plugin-name "/" plugin-name ".h>

#include <vlibapi/api.h>
#include <vlibmemory/api.h>
#include <vlibsocket/api.h>

/* define message IDs */
#include <" plugin-name "/" plugin-name "_msg_enum.h>

/* define message structures */
#define vl_typedefs
#include <" plugin-name "/" plugin-name "_all_api_h.h> 
#undef vl_typedefs

/* define generated endian-swappers */
#define vl_endianfun
#include <" plugin-name "/" plugin-name "_all_api_h.h> 
#undef vl_endianfun

/* instantiate all the print functions we know about */
#define vl_print(handle, ...) vlib_cli_output (handle, __VA_ARGS__)
#define vl_printfun
#include <" plugin-name "/" plugin-name "_all_api_h.h> 
#undef vl_printfun

/* Get the API version number */
#define vl_api_version(n,v) static u32 api_version=(v);
#include <" plugin-name "/" plugin-name "_all_api_h.h>
#undef vl_api_version

/* 
 * A handy macro to set up a message reply.
 * Assumes that the following variables are available:
 * mp - pointer to request message
 * rmp - pointer to reply message type
 * rv - return value
 */

#define REPLY_MACRO(t)                                          \\
do {                                                            \\
    unix_shared_memory_queue_t * q =                            \\
    vl_api_client_index_to_input_queue (mp->client_index);      \\
    if (!q)                                                     \\
        return;                                                 \\
                                                                \\
    rmp = vl_msg_api_alloc (sizeof (*rmp));                     \\
    rmp->_vl_msg_id = ntohs((t)+sm->msg_id_base);               \\
    rmp->context = mp->context;                                 \\
    rmp->retval = ntohl(rv);                                    \\
                                                                \\
    vl_msg_api_send_shmem (q, (u8 *)&rmp);                      \\
} while(0);


/* List of message types that this plugin understands */

#define foreach_" plugin-name "_plugin_api_msg                           \\
_(" PLUGIN-NAME "_ENABLE_DISABLE, " plugin-name "_enable_disable)

/* 
 * This routine exists to convince the vlib plugin framework that
 * we haven't accidentally copied a random .dll into the plugin directory.
 *
 * Also collects global variable pointers passed from the vpp engine
 */

clib_error_t * 
vlib_plugin_register (vlib_main_t * vm, vnet_plugin_handoff_t * h,
                      int from_early_init)
{
  " plugin-name "_main_t * sm = &" plugin-name "_main;
  clib_error_t * error = 0;

  sm->vlib_main = vm;
  sm->vnet_main = h->vnet_main;
  sm->ethernet_main = h->ethernet_main;

  return error;
}

/* Action function shared between message handler and debug CLI */

int " plugin-name "_enable_disable (" plugin-name "_main_t * sm, u32 sw_if_index,
                                   int enable_disable)
{
  vnet_sw_interface_t * sw;
  int rv;
  u32 node_index = enable_disable ? " plugin-name "_node.index : ~0;

  /* Utterly wrong? */
  if (pool_is_free_index (sm->vnet_main->interface_main.sw_interfaces, 
                          sw_if_index))
    return VNET_API_ERROR_INVALID_SW_IF_INDEX;

  /* Not a physical port? */
  sw = vnet_get_sw_interface (sm->vnet_main, sw_if_index);
  if (sw->type != VNET_SW_INTERFACE_TYPE_HARDWARE)
    return VNET_API_ERROR_INVALID_SW_IF_INDEX;
  
  /* 
   * Redirect pkts from the driver to the macswap node.
   * Returns VNET_API_ERROR_UNIMPLEMENTED if the h/w driver
   * doesn't implement the API. 
   *
   * Node_index = ~0 => shut off redirection
   */
  rv = vnet_hw_interface_rx_redirect_to_node (sm->vnet_main, sw_if_index,
                                              node_index);
  return rv;
}

static clib_error_t *
" plugin-name "_enable_disable_command_fn (vlib_main_t * vm,
                                   unformat_input_t * input,
                                   vlib_cli_command_t * cmd)
{
  " plugin-name "_main_t * sm = &" plugin-name "_main;
  u32 sw_if_index = ~0;
  int enable_disable = 1;
    
  int rv;

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) {
    if (unformat (input, \"disable\"))
      enable_disable = 0;
    else if (unformat (input, \"%U\", unformat_vnet_sw_interface,
                       sm->vnet_main, &sw_if_index))
      ;
    else
      break;
  }

  if (sw_if_index == ~0)
    return clib_error_return (0, \"Please specify an interface...\");
    
  rv = " plugin-name "_enable_disable (sm, sw_if_index, enable_disable);

  switch(rv) {
  case 0:
    break;

  case VNET_API_ERROR_INVALID_SW_IF_INDEX:
    return clib_error_return 
      (0, \"Invalid interface, only works on physical ports\");
    break;

  case VNET_API_ERROR_UNIMPLEMENTED:
    return clib_error_return (0, \"Device driver doesn't support redirection\");
    break;

  default:
    return clib_error_return (0, \"" plugin-name "_enable_disable returned %d\",
                              rv);
  }
  return 0;
}

VLIB_CLI_COMMAND (" plugin-name "_enable_disable_command, static) = {
    .path = \"" plugin-name " enable-disable\",
    .short_help = 
    \"" plugin-name " enable-disable <interface-name> [disable]\",
    .function = " plugin-name "_enable_disable_command_fn,
};

/* API message handler */
static void vl_api_" plugin-name "_enable_disable_t_handler
(vl_api_" plugin-name "_enable_disable_t * mp)
{
  vl_api_" plugin-name "_enable_disable_reply_t * rmp;
  " plugin-name "_main_t * sm = &" plugin-name "_main;
  int rv;

  rv = " plugin-name "_enable_disable (sm, ntohl(mp->sw_if_index), 
                                      (int) (mp->enable_disable));
  
  REPLY_MACRO(VL_API_" PLUGIN-NAME "_ENABLE_DISABLE_REPLY);
}

/* Set up the API message handling tables */
static clib_error_t *
" plugin-name "_plugin_api_hookup (vlib_main_t *vm)
{
  " plugin-name "_main_t * sm = &" plugin-name "_main;
#define _(N,n)                                                  \\
    vl_msg_api_set_handlers((VL_API_##N + sm->msg_id_base),     \\
                           #n,					\\
                           vl_api_##n##_t_handler,              \\
                           vl_noop_handler,                     \\
                           vl_api_##n##_t_endian,               \\
                           vl_api_##n##_t_print,                \\
                           sizeof(vl_api_##n##_t), 1); 
    foreach_" plugin-name "_plugin_api_msg;
#undef _

    return 0;
}

static clib_error_t * " plugin-name "_init (vlib_main_t * vm)
{
  " plugin-name "_main_t * sm = &" plugin-name "_main;
  clib_error_t * error = 0;
  u8 * name;

  name = format (0, \"" plugin-name "_%08x%c\", api_version, 0);

  /* Ask for a correctly-sized block of API message decode slots */
  sm->msg_id_base = vl_msg_api_get_msg_ids 
      ((char *) name, VL_MSG_FIRST_AVAILABLE);

  error = " plugin-name "_plugin_api_hookup (vm);

  vec_free(name);

  return error;
}

VLIB_INIT_FUNCTION (" plugin-name "_init);
")