ff3d2f3a6af66db65e1a4b320218bcc582776ac9
[vpp.git] / src / vnet / l2 / l2_patch.c
1 /*
2  * Copyright (c) 2015 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 #include <vlib/vlib.h>
16 #include <vnet/vnet.h>
17 #include <vnet/pg/pg.h>
18 #include <vnet/ethernet/ethernet.h>
19 #include <vnet/feature/feature.h>
20 #include <vppinfra/error.h>
21
22 typedef struct
23 {
24   /* vector of dispositions, indexed by rx_sw_if_index */
25   u32 *tx_next_by_rx_sw_if_index;
26   u32 *tx_sw_if_index_by_rx_sw_if_index;
27
28   /* convenience variables */
29   vlib_main_t *vlib_main;
30   vnet_main_t *vnet_main;
31 } l2_patch_main_t;
32
33 typedef struct
34 {
35   u32 rx_sw_if_index;
36   u32 tx_sw_if_index;
37 } l2_patch_trace_t;
38
39 /* packet trace format function */
40 static u8 *
41 format_l2_patch_trace (u8 * s, va_list * args)
42 {
43   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
44   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
45   l2_patch_trace_t *t = va_arg (*args, l2_patch_trace_t *);
46
47   s = format (s, "L2_PATCH: rx %d tx %d", t->rx_sw_if_index,
48               t->tx_sw_if_index);
49   return s;
50 }
51
52 l2_patch_main_t l2_patch_main;
53
54 static vlib_node_registration_t l2_patch_node;
55
56 #define foreach_l2_patch_error                  \
57 _(PATCHED, "L2 patch packets")                  \
58 _(DROPPED, "L2 patch misconfigured drops")
59
60 typedef enum
61 {
62 #define _(sym,str) L2_PATCH_ERROR_##sym,
63   foreach_l2_patch_error
64 #undef _
65     L2_PATCH_N_ERROR,
66 } l2_patch_error_t;
67
68 static char *l2_patch_error_strings[] = {
69 #define _(sym,string) string,
70   foreach_l2_patch_error
71 #undef _
72 };
73
74 typedef enum
75 {
76   L2_PATCH_NEXT_DROP,
77   L2_PATCH_N_NEXT,
78 } l2_patch_next_t;
79
80 static uword
81 l2_patch_node_fn (vlib_main_t * vm,
82                   vlib_node_runtime_t * node, vlib_frame_t * frame)
83 {
84   u32 n_left_from, *from, *to_next;
85   l2_patch_next_t next_index;
86   l2_patch_main_t *l2pm = &l2_patch_main;
87   vlib_node_t *n = vlib_get_node (vm, l2_patch_node.index);
88   u32 node_counter_base_index = n->error_heap_index;
89   vlib_error_main_t *em = &vm->error_main;
90
91   from = vlib_frame_vector_args (frame);
92   n_left_from = frame->n_vectors;
93   next_index = node->cached_next_index;
94
95   while (n_left_from > 0)
96     {
97       u32 n_left_to_next;
98
99       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
100
101       while (n_left_from >= 4 && n_left_to_next >= 2)
102         {
103           u32 bi0, bi1;
104           vlib_buffer_t *b0, *b1;
105           u32 next0, next1;
106           u32 sw_if_index0, sw_if_index1;
107
108           /* Prefetch next iteration. */
109           {
110             vlib_buffer_t *p2, *p3;
111
112             p2 = vlib_get_buffer (vm, from[2]);
113             p3 = vlib_get_buffer (vm, from[3]);
114
115             vlib_prefetch_buffer_header (p2, LOAD);
116             vlib_prefetch_buffer_header (p3, LOAD);
117
118             /* So stupid / simple, we don't need to prefetch data */
119           }
120
121           /* speculatively enqueue b0 and b1 to the current next frame */
122           to_next[0] = bi0 = from[0];
123           to_next[1] = bi1 = from[1];
124           from += 2;
125           to_next += 2;
126           n_left_from -= 2;
127           n_left_to_next -= 2;
128
129           b0 = vlib_get_buffer (vm, bi0);
130           b1 = vlib_get_buffer (vm, bi1);
131
132           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
133           sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
134
135           ASSERT (l2pm->tx_next_by_rx_sw_if_index[sw_if_index0] != ~0);
136           ASSERT (l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index0] != ~0);
137           ASSERT (l2pm->tx_next_by_rx_sw_if_index[sw_if_index1] != ~0);
138           ASSERT (l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index1] != ~0);
139
140           next0 = l2pm->tx_next_by_rx_sw_if_index[sw_if_index0];
141           next1 = l2pm->tx_next_by_rx_sw_if_index[sw_if_index1];
142           vnet_buffer (b0)->sw_if_index[VLIB_TX] =
143             l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index0];
144           vnet_buffer (b1)->sw_if_index[VLIB_TX] =
145             l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index1];
146
147           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
148             {
149               if (b0->flags & VLIB_BUFFER_IS_TRACED)
150                 {
151                   l2_patch_trace_t *t =
152                     vlib_add_trace (vm, node, b0, sizeof (*t));
153                   t->rx_sw_if_index = sw_if_index0;
154                   t->tx_sw_if_index =
155                     l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index0];
156                 }
157               if (b1->flags & VLIB_BUFFER_IS_TRACED)
158                 {
159                   l2_patch_trace_t *t =
160                     vlib_add_trace (vm, node, b1, sizeof (*t));
161                   t->rx_sw_if_index = sw_if_index1;
162                   t->tx_sw_if_index =
163                     l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index1];
164                 }
165             }
166
167           /* verify speculative enqueues, maybe switch current next frame */
168           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
169                                            to_next, n_left_to_next,
170                                            bi0, bi1, next0, next1);
171         }
172
173       while (n_left_from > 0 && n_left_to_next > 0)
174         {
175           u32 bi0;
176           vlib_buffer_t *b0;
177           u32 next0;
178           u32 sw_if_index0;
179
180           /* speculatively enqueue b0 to the current next frame */
181           bi0 = from[0];
182           to_next[0] = bi0;
183           from += 1;
184           to_next += 1;
185           n_left_from -= 1;
186           n_left_to_next -= 1;
187
188           b0 = vlib_get_buffer (vm, bi0);
189
190           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
191
192           ASSERT (l2pm->tx_next_by_rx_sw_if_index[sw_if_index0] != ~0);
193           ASSERT (l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index0] != ~0);
194
195           next0 = l2pm->tx_next_by_rx_sw_if_index[sw_if_index0];
196           vnet_buffer (b0)->sw_if_index[VLIB_TX] =
197             l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index0];
198
199           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
200             {
201               if (b0->flags & VLIB_BUFFER_IS_TRACED)
202                 {
203                   l2_patch_trace_t *t =
204                     vlib_add_trace (vm, node, b0, sizeof (*t));
205                   t->rx_sw_if_index = sw_if_index0;
206                   t->tx_sw_if_index =
207                     l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index0];
208                 }
209             }
210
211           /* verify speculative enqueue, maybe switch current next frame */
212           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
213                                            to_next, n_left_to_next,
214                                            bi0, next0);
215         }
216
217       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
218     }
219
220   em->counters[node_counter_base_index + L2_PATCH_ERROR_PATCHED] +=
221     frame->n_vectors;
222
223   return frame->n_vectors;
224 }
225
226 /* *INDENT-OFF* */
227 VLIB_REGISTER_NODE (l2_patch_node, static) = {
228   .function = l2_patch_node_fn,
229   .name = "l2-patch",
230   .vector_size = sizeof (u32),
231   .format_trace = format_l2_patch_trace,
232   .type = VLIB_NODE_TYPE_INTERNAL,
233
234   .n_errors = ARRAY_LEN(l2_patch_error_strings),
235   .error_strings = l2_patch_error_strings,
236
237   .n_next_nodes = L2_PATCH_N_NEXT,
238
239   /* edit / add dispositions here */
240   .next_nodes = {
241         [L2_PATCH_NEXT_DROP] = "error-drop",
242   },
243 };
244 /* *INDENT-ON* */
245
246 VLIB_NODE_FUNCTION_MULTIARCH (l2_patch_node, l2_patch_node_fn)
247      int vnet_l2_patch_add_del (u32 rx_sw_if_index, u32 tx_sw_if_index,
248                                 int is_add)
249 {
250   l2_patch_main_t *l2pm = &l2_patch_main;
251   vnet_hw_interface_t *rxhi, *txhi;
252   u32 tx_next_index;
253
254   /*
255    * We assume that the API msg handler has used 2x VALIDATE_SW_IF_INDEX
256    * macros...
257    */
258
259   rxhi = vnet_get_sup_hw_interface (l2pm->vnet_main, rx_sw_if_index);
260
261   /* Make sure caller didn't pass a vlan subif, etc. */
262   if (rxhi->sw_if_index != rx_sw_if_index)
263     return VNET_API_ERROR_INVALID_SW_IF_INDEX;
264
265   txhi = vnet_get_sup_hw_interface (l2pm->vnet_main, tx_sw_if_index);
266   if (txhi->sw_if_index != tx_sw_if_index)
267     return VNET_API_ERROR_INVALID_SW_IF_INDEX_2;
268
269   if (is_add)
270     {
271       tx_next_index = vlib_node_add_next (l2pm->vlib_main,
272                                           l2_patch_node.index,
273                                           txhi->output_node_index);
274
275       vec_validate_init_empty (l2pm->tx_next_by_rx_sw_if_index,
276                                rx_sw_if_index, ~0);
277
278       l2pm->tx_next_by_rx_sw_if_index[rx_sw_if_index] = tx_next_index;
279       vec_validate_init_empty (l2pm->tx_sw_if_index_by_rx_sw_if_index,
280                                rx_sw_if_index, ~0);
281       l2pm->tx_sw_if_index_by_rx_sw_if_index[rx_sw_if_index]
282         = txhi->sw_if_index;
283
284       ethernet_set_flags (l2pm->vnet_main, rxhi->hw_if_index,
285                           ETHERNET_INTERFACE_FLAG_ACCEPT_ALL);
286
287       vnet_feature_enable_disable ("device-input", "l2-patch",
288                                    rxhi->hw_if_index, 1, 0, 0);
289     }
290   else
291     {
292       ethernet_set_flags (l2pm->vnet_main, rxhi->hw_if_index,
293                           0 /* disable promiscuous mode */ );
294
295       vnet_feature_enable_disable ("device-input", "l2-patch",
296                                    rxhi->hw_if_index, 0, 0, 0);
297       if (vec_len (l2pm->tx_next_by_rx_sw_if_index) > rx_sw_if_index)
298         {
299           l2pm->tx_next_by_rx_sw_if_index[rx_sw_if_index] = ~0;
300           l2pm->tx_sw_if_index_by_rx_sw_if_index[rx_sw_if_index] = ~0;
301         }
302     }
303
304   return 0;
305 }
306
307 static clib_error_t *
308 test_patch_command_fn (vlib_main_t * vm,
309                        unformat_input_t * input, vlib_cli_command_t * cmd)
310 {
311   l2_patch_main_t *l2pm = &l2_patch_main;
312   unformat_input_t _line_input, *line_input = &_line_input;
313   u32 rx_sw_if_index, tx_sw_if_index;
314   int rv;
315   int rx_set = 0;
316   int tx_set = 0;
317   int is_add = 1;
318   clib_error_t *error = NULL;
319
320   /* Get a line of input. */
321   if (!unformat_user (input, unformat_line_input, line_input))
322     return 0;
323
324   while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
325     {
326       if (unformat (line_input, "rx %U", unformat_vnet_sw_interface,
327                     l2pm->vnet_main, &rx_sw_if_index))
328         rx_set = 1;
329       else if (unformat (line_input, "tx %U", unformat_vnet_sw_interface,
330                          l2pm->vnet_main, &tx_sw_if_index))
331         tx_set = 1;
332       else if (unformat (line_input, "del"))
333         is_add = 0;
334       else
335         break;
336     }
337
338   if (rx_set == 0)
339     {
340       error = clib_error_return (0, "rx interface not set");
341       goto done;
342     }
343
344   if (tx_set == 0)
345     {
346       error = clib_error_return (0, "tx interface not set");
347       goto done;
348     }
349
350   rv = vnet_l2_patch_add_del (rx_sw_if_index, tx_sw_if_index, is_add);
351
352   switch (rv)
353     {
354     case 0:
355       break;
356
357     case VNET_API_ERROR_INVALID_SW_IF_INDEX:
358       error = clib_error_return (0, "rx interface not a physical port");
359       goto done;
360
361     case VNET_API_ERROR_INVALID_SW_IF_INDEX_2:
362       error = clib_error_return (0, "tx interface not a physical port");
363       goto done;
364
365     default:
366       error = clib_error_return
367         (0, "WARNING: vnet_l2_patch_add_del returned %d", rv);
368       goto done;
369     }
370
371
372 done:
373   unformat_free (line_input);
374
375   return error;
376 }
377
378 /*?
379  * Create or delete a Layer 2 patch.
380  *
381  * @cliexpar
382  * @cliexstart{test l2patch rx <intfc> tx <intfc> [del]}
383  * @cliexend
384  * @todo This is incomplete. This needs a detailed description and a
385  * practical example.
386 ?*/
387 /* *INDENT-OFF* */
388 VLIB_CLI_COMMAND (test_patch_command, static) = {
389     .path = "test l2patch",
390     .short_help = "test l2patch rx <intfc> tx <intfc> [del]",
391     .function = test_patch_command_fn,
392 };
393 /* *INDENT-ON* */
394
395 /** Display the contents of the l2patch table. */
396 static clib_error_t *
397 show_l2patch (vlib_main_t * vm,
398               unformat_input_t * input, vlib_cli_command_t * cmd)
399 {
400   l2_patch_main_t *l2pm = &l2_patch_main;
401   u32 rx_sw_if_index;
402   u32 no_entries = 1;
403
404   ASSERT (vec_len (l2pm->tx_next_by_rx_sw_if_index) ==
405           vec_len (l2pm->tx_sw_if_index_by_rx_sw_if_index));
406
407   for (rx_sw_if_index = 0;
408        rx_sw_if_index < vec_len (l2pm->tx_sw_if_index_by_rx_sw_if_index);
409        rx_sw_if_index++)
410     {
411       u32 tx_sw_if_index =
412         l2pm->tx_sw_if_index_by_rx_sw_if_index[rx_sw_if_index];
413       if (tx_sw_if_index != ~0)
414         {
415           no_entries = 0;
416           vlib_cli_output (vm, "%26U -> %U",
417                            format_vnet_sw_if_index_name,
418                            l2pm->vnet_main, rx_sw_if_index,
419                            format_vnet_sw_if_index_name,
420                            l2pm->vnet_main, tx_sw_if_index);
421         }
422     }
423
424   if (no_entries)
425     vlib_cli_output (vm, "no l2patch entries");
426
427   return 0;
428 }
429
430 /*?
431  * Show Layer 2 patch entries.
432  *
433  * @cliexpar
434  * @cliexstart{show l2patch}
435  * @cliexend
436  * @todo This is incomplete. This needs a detailed description and a
437  * practical example.
438 ?*/
439 /* *INDENT-OFF* */
440 VLIB_CLI_COMMAND (show_l2patch_cli, static) = {
441   .path = "show l2patch",
442   .short_help = "Show l2 interface cross-connect entries",
443   .function = show_l2patch,
444 };
445 /* *INDENT-ON* */
446
447 clib_error_t *
448 l2_patch_init (vlib_main_t * vm)
449 {
450   l2_patch_main_t *mp = &l2_patch_main;
451
452   mp->vlib_main = vm;
453   mp->vnet_main = vnet_get_main ();
454
455   return 0;
456 }
457
458 VLIB_INIT_FUNCTION (l2_patch_init);
459
460 /*
461  * fd.io coding-style-patch-verification: ON
462  *
463  * Local Variables:
464  * eval: (c-set-style "gnu")
465  * End:
466  */