L2 BD: introduce a BD interface on which to send UU packets
[vpp.git] / src / vnet / l2 / l2_uu_fwd.c
1 /*
2  * l2_uu_fwd.c : Foward unknown unicast packets to BD's configured interface
3  *
4  * Copyright (c) 2018 Cisco and/or its affiliates.
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:
8  *
9  *     http://www.apache.org/licenses/LICENSE-2.0
10  *
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.
16  */
17
18 #include <vnet/l2/l2_bd.h>
19 #include <vnet/l2/l2_input.h>
20
21 #define foreach_l2_uu_fwd_error                                 \
22 _(L2_UU_FWD,           "L2 UU fwd")
23
24 typedef enum
25 {
26 #define _(sym,str) L2_UU_FWD_ERROR_##sym,
27   foreach_l2_uu_fwd_error
28 #undef _
29     L2_UU_FWD_N_ERROR,
30 } l2_uu_fwd_error_t;
31
32 static char *l2_uu_fwd_error_strings[] = {
33 #define _(sym,string) string,
34   foreach_l2_uu_fwd_error
35 #undef _
36 };
37
38 typedef enum
39 {
40   L2_UU_FWD_NEXT_DROP,
41   L2_UU_FWD_NEXT_L2_OUTPUT,
42   L2_UU_FWD_N_NEXT,
43 } l2_uu_fwd_next_t;
44
45 typedef struct
46 {
47   u32 sw_if_index;
48 } l2_uu_fwd_trace_t;
49
50 /* packet trace format function */
51 static u8 *
52 format_l2_uu_fwd_trace (u8 * s, va_list * args)
53 {
54   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
55   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
56   l2_uu_fwd_trace_t *t = va_arg (*args, l2_uu_fwd_trace_t *);
57
58   s = format (s, "l2-uu-fwd: sw_if_index %d", t->sw_if_index);
59   return s;
60 }
61
62 static uword
63 l2_uu_fwd_node_fn (vlib_main_t * vm,
64                    vlib_node_runtime_t * node, vlib_frame_t * frame)
65 {
66   u32 n_left_from, *from, *to_next;
67   l2_uu_fwd_next_t next_index;
68
69   from = vlib_frame_vector_args (frame);
70   n_left_from = frame->n_vectors;
71   next_index = node->cached_next_index;
72
73   while (n_left_from > 0)
74     {
75       u32 n_left_to_next;
76
77       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
78
79       while (n_left_from >= 8 && n_left_to_next >= 4)
80         {
81           const l2_bridge_domain_t *bdc0, *bdc1, *bdc2, *bdc3;
82           l2_uu_fwd_next_t next0, next1, next2, next3;
83           vlib_buffer_t *b0, *b1, *b2, *b3;
84           u32 bi0, bi1, bi2, bi3;
85
86           {
87             vlib_buffer_t *b4, *b5, *b6, *b7;
88
89             b4 = vlib_get_buffer (vm, from[4]);
90             b5 = vlib_get_buffer (vm, from[5]);
91             b6 = vlib_get_buffer (vm, from[6]);
92             b7 = vlib_get_buffer (vm, from[7]);
93
94             vlib_prefetch_buffer_header (b4, STORE);
95             vlib_prefetch_buffer_header (b5, STORE);
96             vlib_prefetch_buffer_header (b6, STORE);
97             vlib_prefetch_buffer_header (b7, STORE);
98           }
99           bi0 = to_next[0] = from[0];
100           bi1 = to_next[1] = from[1];
101           bi2 = to_next[2] = from[2];
102           bi3 = to_next[3] = from[3];
103
104           from += 4;
105           to_next += 4;
106           n_left_from -= 4;
107           n_left_to_next -= 4;
108
109           next3 = next2 = next1 = next0 = L2_UU_FWD_NEXT_L2_OUTPUT;
110
111           b0 = vlib_get_buffer (vm, bi0);
112           b1 = vlib_get_buffer (vm, bi1);
113           b2 = vlib_get_buffer (vm, bi2);
114           b3 = vlib_get_buffer (vm, bi3);
115
116           bdc0 = vec_elt_at_index (l2input_main.bd_configs,
117                                    vnet_buffer (b0)->l2.bd_index);
118           bdc1 = vec_elt_at_index (l2input_main.bd_configs,
119                                    vnet_buffer (b1)->l2.bd_index);
120           bdc2 = vec_elt_at_index (l2input_main.bd_configs,
121                                    vnet_buffer (b2)->l2.bd_index);
122           bdc3 = vec_elt_at_index (l2input_main.bd_configs,
123                                    vnet_buffer (b3)->l2.bd_index);
124
125           ASSERT (~0 != bdc0->uu_fwd_sw_if_index);
126
127           vnet_buffer (b0)->sw_if_index[VLIB_TX] = bdc0->uu_fwd_sw_if_index;
128           vnet_buffer (b1)->sw_if_index[VLIB_TX] = bdc1->uu_fwd_sw_if_index;
129           vnet_buffer (b2)->sw_if_index[VLIB_TX] = bdc2->uu_fwd_sw_if_index;
130           vnet_buffer (b3)->sw_if_index[VLIB_TX] = bdc3->uu_fwd_sw_if_index;
131
132           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
133                              (b0->flags & VLIB_BUFFER_IS_TRACED)))
134             {
135               l2_uu_fwd_trace_t *t;
136
137               t = vlib_add_trace (vm, node, b0, sizeof (*t));
138               t->sw_if_index = bdc0->uu_fwd_sw_if_index;
139             }
140           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
141                              (b1->flags & VLIB_BUFFER_IS_TRACED)))
142             {
143               l2_uu_fwd_trace_t *t;
144
145               t = vlib_add_trace (vm, node, b1, sizeof (*t));
146               t->sw_if_index = bdc1->uu_fwd_sw_if_index;
147             }
148           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
149                              (b1->flags & VLIB_BUFFER_IS_TRACED)))
150             {
151               l2_uu_fwd_trace_t *t;
152
153               t = vlib_add_trace (vm, node, b2, sizeof (*t));
154               t->sw_if_index = bdc2->uu_fwd_sw_if_index;
155             }
156           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
157                              (b1->flags & VLIB_BUFFER_IS_TRACED)))
158             {
159               l2_uu_fwd_trace_t *t;
160
161               t = vlib_add_trace (vm, node, b3, sizeof (*t));
162               t->sw_if_index = bdc3->uu_fwd_sw_if_index;
163             }
164           vlib_validate_buffer_enqueue_x4 (vm, node, next_index,
165                                            to_next, n_left_to_next,
166                                            bi0, bi1, bi2, bi3,
167                                            next0, next1, next2, next3);
168         }
169
170       while (n_left_from > 0 && n_left_to_next > 0)
171         {
172           const l2_bridge_domain_t *bdc0;
173           l2_uu_fwd_next_t next0;
174           vlib_buffer_t *b0;
175           u32 bi0;
176
177           bi0 = from[0];
178           to_next[0] = bi0;
179           from += 1;
180           to_next += 1;
181           n_left_from -= 1;
182           n_left_to_next -= 1;
183           next0 = L2_UU_FWD_NEXT_L2_OUTPUT;
184           b0 = vlib_get_buffer (vm, bi0);
185
186           bdc0 = vec_elt_at_index (l2input_main.bd_configs,
187                                    vnet_buffer (b0)->l2.bd_index);
188           ASSERT (~0 != bdc0->uu_fwd_sw_if_index);
189
190           vnet_buffer (b0)->sw_if_index[VLIB_TX] = bdc0->uu_fwd_sw_if_index;
191
192           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
193                              (b0->flags & VLIB_BUFFER_IS_TRACED)))
194             {
195               l2_uu_fwd_trace_t *t;
196
197               t = vlib_add_trace (vm, node, b0, sizeof (*t));
198               t->sw_if_index = bdc0->uu_fwd_sw_if_index;
199             }
200           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
201                                            to_next, n_left_to_next,
202                                            bi0, next0);
203         }
204
205       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
206     }
207
208   vlib_node_increment_counter (vm, node->node_index,
209                                L2_UU_FWD_ERROR_L2_UU_FWD, frame->n_vectors);
210
211   return frame->n_vectors;
212 }
213
214 /* *INDENT-OFF* */
215 VLIB_REGISTER_NODE (l2_uu_fwd_node,static) = {
216   .function = l2_uu_fwd_node_fn,
217   .name = "l2-uu-fwd",
218   .vector_size = sizeof (u32),
219   .format_trace = format_l2_uu_fwd_trace,
220   .type = VLIB_NODE_TYPE_INTERNAL,
221
222   .n_errors = ARRAY_LEN(l2_uu_fwd_error_strings),
223   .error_strings = l2_uu_fwd_error_strings,
224
225   .n_next_nodes = L2_UU_FWD_N_NEXT,
226
227   .next_nodes = {
228         [L2_UU_FWD_NEXT_DROP] = "error-drop",
229         [L2_UU_FWD_NEXT_L2_OUTPUT] = "l2-output",
230   },
231 };
232
233 VLIB_NODE_FUNCTION_MULTIARCH (l2_uu_fwd_node, l2_uu_fwd_node_fn)
234 /* *INDENT-ON* */
235
236 /*
237  * fd.io coding-style-patch-verification: ON
238  *
239  * Local Variables:
240  * eval: (c-set-style "gnu")
241  * End:
242  */