src/vnet/dpo/interface_dpo.c

   1 /*
   2  * Copyright (c) 2016 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 #include <vnet/dpo/interface_dpo.h>
  17 #include <vnet/fib/fib_node.h>
  18
  19 /*
  20  * The 'DB' of interface DPOs.
  21  * There is only one  per-interface per-protocol, so this is a per-interface
  22  * vector
  23  */
  24 static index_t *interface_dpo_db[DPO_PROTO_NUM];
  25
  26 static interface_dpo_t *
  27 interface_dpo_alloc (void)
  28 {
  29     interface_dpo_t *ido;
  30
  31     pool_get(interface_dpo_pool, ido);
  32
  33     return (ido);
  34 }
  35
  36 static inline interface_dpo_t *
  37 interface_dpo_get_from_dpo (const dpo_id_t *dpo)
  38 {
  39     ASSERT(DPO_INTERFACE == dpo->dpoi_type);
  40
  41     return (interface_dpo_get(dpo->dpoi_index));
  42 }
  43
  44 static inline index_t
  45 interface_dpo_get_index (interface_dpo_t *ido)
  46 {
  47     return (ido - interface_dpo_pool);
  48 }
  49
  50 static void
  51 interface_dpo_lock (dpo_id_t *dpo)
  52 {
  53     interface_dpo_t *ido;
  54
  55     ido = interface_dpo_get_from_dpo(dpo);
  56     ido->ido_locks++;
  57 }
  58
  59 static void
  60 interface_dpo_unlock (dpo_id_t *dpo)
  61 {
  62     interface_dpo_t *ido;
  63
  64     ido = interface_dpo_get_from_dpo(dpo);
  65     ido->ido_locks--;
  66
  67     if (0 == ido->ido_locks)
  68     {
  69         interface_dpo_db[ido->ido_proto][ido->ido_sw_if_index] =
  70             INDEX_INVALID;
  71         pool_put(interface_dpo_pool, ido);
  72     }
  73 }
  74
  75 /*
  76  * interface_dpo_add_or_lock
  77  *
  78  * Add/create and lock a new or lock an existing for the interface DPO
  79  * on the interface and protocol given
  80  */
  81 void
  82 interface_dpo_add_or_lock (dpo_proto_t proto,
  83                            u32 sw_if_index,
  84                            dpo_id_t *dpo)
  85 {
  86     interface_dpo_t *ido;
  87
  88     vec_validate_init_empty(interface_dpo_db[proto],
  89                             sw_if_index,
  90                             INDEX_INVALID);
  91
  92     if (INDEX_INVALID == interface_dpo_db[proto][sw_if_index])
  93     {
  94         ido = interface_dpo_alloc();
  95
  96         ido->ido_sw_if_index = sw_if_index;
  97         ido->ido_proto = proto;
  98
  99         interface_dpo_db[proto][sw_if_index] =
 100             interface_dpo_get_index(ido);
 101     }
 102     else
 103     {
 104         ido = interface_dpo_get(interface_dpo_db[proto][sw_if_index]);
 105     }
 106
 107     dpo_set(dpo, DPO_INTERFACE, proto, interface_dpo_get_index(ido));
 108 }
 109
 110
 111 static clib_error_t *
 112 interface_dpo_interface_state_change (vnet_main_t * vnm,
 113                                       u32 sw_if_index,
 114                                       u32 flags)
 115 {
 116     /*
 117      */
 118     return (NULL);
 119 }
 120
 121 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION(
 122     interface_dpo_interface_state_change);
 123
 124 /**
 125  * @brief Registered callback for HW interface state changes
 126  */
 127 static clib_error_t *
 128 interface_dpo_hw_interface_state_change (vnet_main_t * vnm,
 129                                          u32 hw_if_index,
 130                                          u32 flags)
 131 {
 132     return (NULL);
 133 }
 134
 135 VNET_HW_INTERFACE_LINK_UP_DOWN_FUNCTION(
 136     interface_dpo_hw_interface_state_change);
 137
 138 static clib_error_t *
 139 interface_dpo_interface_delete (vnet_main_t * vnm,
 140                                 u32 sw_if_index,
 141                                 u32 is_add)
 142 {
 143     return (NULL);
 144 }
 145
 146 VNET_SW_INTERFACE_ADD_DEL_FUNCTION(
 147     interface_dpo_interface_delete);
 148
 149 u8*
 150 format_interface_dpo (u8* s, va_list *ap)
 151 {
 152     index_t index = va_arg(*ap, index_t);
 153     CLIB_UNUSED(u32 indent) = va_arg(*ap, u32);
 154     vnet_main_t * vnm = vnet_get_main();
 155     interface_dpo_t *ido = interface_dpo_get(index);
 156
 157     return (format(s, "%U-dpo: %U",
 158                    format_vnet_sw_interface_name,
 159                    vnm,
 160                    vnet_get_sw_interface(vnm, ido->ido_sw_if_index),
 161                    format_dpo_proto, ido->ido_proto));
 162 }
 163
 164 static void
 165 interface_dpo_mem_show (void)
 166 {
 167     fib_show_memory_usage("Interface",
 168                           pool_elts(interface_dpo_pool),
 169                           pool_len(interface_dpo_pool),
 170                           sizeof(interface_dpo_t));
 171 }
 172
 173
 174 const static dpo_vft_t interface_dpo_vft = {
 175     .dv_lock = interface_dpo_lock,
 176     .dv_unlock = interface_dpo_unlock,
 177     .dv_format = format_interface_dpo,
 178     .dv_mem_show = interface_dpo_mem_show,
 179 };
 180
 181 /**
 182  * @brief The per-protocol VLIB graph nodes that are assigned to a glean
 183  *        object.
 184  *
 185  * this means that these graph nodes are ones from which a glean is the
 186  * parent object in the DPO-graph.
 187  */
 188 const static char* const interface_dpo_ip4_nodes[] =
 189 {
 190     "interface-dpo-ip4",
 191     NULL,
 192 };
 193 const static char* const interface_dpo_ip6_nodes[] =
 194 {
 195     "interface-dpo-ip4",
 196     NULL,
 197 };
 198
 199 const static char* const * const interface_dpo_nodes[DPO_PROTO_NUM] =
 200 {
 201     [DPO_PROTO_IP4]  = interface_dpo_ip4_nodes,
 202     [DPO_PROTO_IP6]  = interface_dpo_ip6_nodes,
 203     [DPO_PROTO_MPLS] = NULL,
 204 };
 205
 206 void
 207 interface_dpo_module_init (void)
 208 {
 209     dpo_register(DPO_INTERFACE,
 210                  &interface_dpo_vft,
 211                  interface_dpo_nodes);
 212 }
 213
 214 /**
 215  * @brief Interface DPO trace data
 216  */
 217 typedef struct interface_dpo_trace_t_
 218 {
 219     u32 sw_if_index;
 220 } interface_dpo_trace_t;
 221
 222 typedef enum interface_dpo_next_t_
 223 {
 224     INTERFACE_DPO_DROP = 0,
 225     INTERFACE_DPO_INPUT = 1,
 226 } interface_dpo_next_t;
 227
 228 always_inline uword
 229 interface_dpo_inline (vlib_main_t * vm,
 230                       vlib_node_runtime_t * node,
 231                       vlib_frame_t * from_frame)
 232 {
 233     u32 n_left_from, next_index, * from, * to_next;
 234     u32 cpu_index = os_get_cpu_number();
 235     vnet_interface_main_t *im;
 236
 237     im = &vnet_get_main ()->interface_main;
 238     from = vlib_frame_vector_args (from_frame);
 239     n_left_from = from_frame->n_vectors;
 240
 241     next_index = node->cached_next_index;
 242
 243     while (n_left_from > 0)
 244     {
 245         u32 n_left_to_next;
 246
 247         vlib_get_next_frame(vm, node, next_index, to_next, n_left_to_next);
 248
 249         while (n_left_from >= 4 && n_left_to_next > 2)
 250         {
 251             const interface_dpo_t *ido0, *ido1;
 252             u32 bi0, idoi0, bi1, idoi1;
 253             vlib_buffer_t *b0, *b1;
 254
 255             bi0 = from[0];
 256             to_next[0] = bi0;
 257             bi1 = from[1];
 258             to_next[1] = bi1;
 259             from += 2;
 260             to_next += 2;
 261             n_left_from -= 2;
 262             n_left_to_next -= 2;
 263
 264             b0 = vlib_get_buffer (vm, bi0);
 265             b1 = vlib_get_buffer (vm, bi1);
 266
 267             idoi0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
 268             idoi1 = vnet_buffer(b1)->ip.adj_index[VLIB_TX];
 269             ido0 = interface_dpo_get(idoi0);
 270             ido1 = interface_dpo_get(idoi1);
 271
 272             vnet_buffer(b0)->sw_if_index[VLIB_RX] = ido0->ido_sw_if_index;
 273             vnet_buffer(b1)->sw_if_index[VLIB_RX] = ido1->ido_sw_if_index;
 274
 275             vlib_increment_combined_counter (im->combined_sw_if_counters
 276                                              + VNET_INTERFACE_COUNTER_RX,
 277                                              cpu_index,
 278                                              ido0->ido_sw_if_index,
 279                                              1,
 280                                              vlib_buffer_length_in_chain (vm, b0));
 281             vlib_increment_combined_counter (im->combined_sw_if_counters
 282                                              + VNET_INTERFACE_COUNTER_RX,
 283                                              cpu_index,
 284                                              ido1->ido_sw_if_index,
 285                                              1,
 286                                              vlib_buffer_length_in_chain (vm, b1));
 287
 288             if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
 289             {
 290                 interface_dpo_trace_t *tr0;
 291
 292                 tr0 = vlib_add_trace (vm, node, b0, sizeof (*tr0));
 293                 tr0->sw_if_index = ido0->ido_sw_if_index;
 294             }
 295             if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
 296             {
 297                 interface_dpo_trace_t *tr1;
 298
 299                 tr1 = vlib_add_trace (vm, node, b1, sizeof (*tr1));
 300                 tr1->sw_if_index = ido1->ido_sw_if_index;
 301             }
 302
 303             vlib_validate_buffer_enqueue_x2(vm, node, next_index, to_next,
 304                                             n_left_to_next, bi0, bi1,
 305                                             INTERFACE_DPO_INPUT,
 306                                             INTERFACE_DPO_INPUT);
 307         }
 308
 309         while (n_left_from > 0 && n_left_to_next > 0)
 310         {
 311             const interface_dpo_t * ido0;
 312             vlib_buffer_t * b0;
 313             u32 bi0, idoi0;
 314
 315             bi0 = from[0];
 316             to_next[0] = bi0;
 317             from += 1;
 318             to_next += 1;
 319             n_left_from -= 1;
 320             n_left_to_next -= 1;
 321
 322             b0 = vlib_get_buffer (vm, bi0);
 323
 324             idoi0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
 325             ido0 = interface_dpo_get(idoi0);
 326
 327             /* Swap the RX interface of the packet to the one the
 328              * interface DPR represents */
 329             vnet_buffer(b0)->sw_if_index[VLIB_RX] = ido0->ido_sw_if_index;
 330
 331             /* Bump the interface's RX coutners */
 332             vlib_increment_combined_counter (im->combined_sw_if_counters
 333                                              + VNET_INTERFACE_COUNTER_RX,
 334                                              cpu_index,
 335                                              ido0->ido_sw_if_index,
 336                                              1,
 337                                              vlib_buffer_length_in_chain (vm, b0));
 338
 339             if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
 340             {
 341                 interface_dpo_trace_t *tr;
 342
 343                 tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
 344                 tr->sw_if_index = ido0->ido_sw_if_index;
 345             }
 346
 347             vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next,
 348                                             n_left_to_next, bi0,
 349                                             INTERFACE_DPO_INPUT);
 350         }
 351         vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 352     }
 353     return from_frame->n_vectors;
 354 }
 355
 356 static u8 *
 357 format_interface_dpo_trace (u8 * s, va_list * args)
 358 {
 359     CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 360     CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 361     interface_dpo_trace_t * t = va_arg (*args, interface_dpo_trace_t *);
 362     uword indent = format_get_indent (s);
 363     s = format (s, "%U sw_if_index:%d",
 364                 format_white_space, indent,
 365                 t->sw_if_index);
 366     return s;
 367 }
 368
 369 static uword
 370 interface_dpo_ip4 (vlib_main_t * vm,
 371                    vlib_node_runtime_t * node,
 372                    vlib_frame_t * from_frame)
 373 {
 374     return (interface_dpo_inline(vm, node, from_frame));
 375 }
 376
 377 static uword
 378 interface_dpo_ip6 (vlib_main_t * vm,
 379                    vlib_node_runtime_t * node,
 380                    vlib_frame_t * from_frame)
 381 {
 382     return (interface_dpo_inline(vm, node, from_frame));
 383 }
 384
 385 VLIB_REGISTER_NODE (interface_dpo_ip4_node) = {
 386     .function = interface_dpo_ip4,
 387     .name = "interface-dpo-ip4",
 388     .vector_size = sizeof (u32),
 389     .format_trace = format_interface_dpo_trace,
 390
 391     .n_next_nodes = 2,
 392     .next_nodes = {
 393         [INTERFACE_DPO_DROP] = "ip4-drop",
 394         [INTERFACE_DPO_INPUT] = "ip4-input",
 395     },
 396 };
 397
 398 VLIB_NODE_FUNCTION_MULTIARCH (interface_dpo_ip4_node,
 399                               interface_dpo_ip4)
 400
 401 VLIB_REGISTER_NODE (interface_dpo_ip6_node) = {
 402     .function = interface_dpo_ip6,
 403     .name = "interface-dpo-ip6",
 404     .vector_size = sizeof (u32),
 405     .format_trace = format_interface_dpo_trace,
 406
 407     .n_next_nodes = 2,
 408     .next_nodes = {
 409         [INTERFACE_DPO_DROP] = "ip6-drop",
 410         [INTERFACE_DPO_INPUT] = "ip6-input",
 411     },
 412 };
 413
 414 VLIB_NODE_FUNCTION_MULTIARCH (interface_dpo_ip6_node,
 415                               interface_dpo_ip6)
 416