4 * Copyright (c) 2012-2014 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:
9 * http://www.apache.org/licenses/LICENSE-2.0
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.
18 #include <vlib/vlib.h>
19 #include <vnet/pg/pg.h>
20 #include <vnet/mpls/mpls.h>
21 #include <vnet/feature/feature.h>
25 u32 label_net_byte_order;
28 #define foreach_mpls_input_next \
29 _(DROP, "error-drop") \
30 _(LOOKUP, "mpls-lookup")
33 #define _(s,n) MPLS_INPUT_NEXT_##s,
34 foreach_mpls_input_next
40 format_mpls_input_trace (u8 * s, va_list * args)
42 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
43 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
44 mpls_input_trace_t * t = va_arg (*args, mpls_input_trace_t *);
48 label = clib_net_to_host_u32(t->label_net_byte_order);
50 #define _(a,b) if (t->next_index == MPLS_INPUT_NEXT_##a) next_name = b;
51 foreach_mpls_input_next;
54 s = format (s, "MPLS: next %s[%d] label %d ttl %d",
55 next_name, t->next_index,
56 vnet_mpls_uc_get_label(label),
57 vnet_mpls_uc_get_ttl(label));
62 vlib_node_registration_t mpls_input_node;
66 u32 last_inner_fib_index;
67 u32 last_outer_fib_index;
68 mpls_main_t * mpls_main;
69 } mpls_input_runtime_t;
72 mpls_input_inline (vlib_main_t * vm,
73 vlib_node_runtime_t * node,
74 vlib_frame_t * from_frame)
76 u32 n_left_from, next_index, * from, * to_next;
77 mpls_input_runtime_t * rt;
79 u32 thread_index = vlib_get_thread_index();
80 vlib_simple_counter_main_t * cm;
81 vnet_main_t * vnm = vnet_get_main();
83 from = vlib_frame_vector_args (from_frame);
84 n_left_from = from_frame->n_vectors;
85 rt = vlib_node_get_runtime_data (vm, mpls_input_node.index);
88 * Force an initial lookup every time, in case the control-plane
89 * changed the label->FIB mapping.
93 next_index = node->cached_next_index;
95 cm = vec_elt_at_index (vnm->interface_main.sw_if_counters,
96 VNET_INTERFACE_COUNTER_MPLS);
98 while (n_left_from > 0)
102 vlib_get_next_frame (vm, node, next_index,
103 to_next, n_left_to_next);
105 while (n_left_from >= 4 && n_left_to_next >= 2)
107 u32 bi0, next0, sw_if_index0;
108 u32 bi1, next1, sw_if_index1;
109 vlib_buffer_t *b0, *b1;
112 /* Prefetch next iteration. */
114 vlib_buffer_t * p2, * p3;
116 p2 = vlib_get_buffer (vm, from[2]);
117 p3 = vlib_get_buffer (vm, from[3]);
119 vlib_prefetch_buffer_header (p2, STORE);
120 vlib_prefetch_buffer_header (p3, STORE);
122 CLIB_PREFETCH (p2->data, sizeof (h0[0]), STORE);
123 CLIB_PREFETCH (p3->data, sizeof (h1[0]), STORE);
126 bi0 = to_next[0] = from[0];
127 bi1 = to_next[1] = from[1];
134 b0 = vlib_get_buffer (vm, bi0);
135 b1 = vlib_get_buffer (vm, bi1);
137 h0 = vlib_buffer_get_current (b0);
138 h1 = vlib_buffer_get_current (b1);
140 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
141 sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
144 if (PREDICT_FALSE(h0[3] == 0))
146 next0 = MPLS_INPUT_NEXT_DROP;
147 b0->error = node->errors[MPLS_ERROR_TTL_EXPIRED];
151 next0 = MPLS_INPUT_NEXT_LOOKUP;
152 vnet_feature_arc_start(mm->input_feature_arc_index,
153 sw_if_index0, &next0, b0);
154 vlib_increment_simple_counter (cm, thread_index, sw_if_index0, 1);
157 if (PREDICT_FALSE(h1[3] == 0))
159 next1 = MPLS_INPUT_NEXT_DROP;
160 b1->error = node->errors[MPLS_ERROR_TTL_EXPIRED];
164 next1 = MPLS_INPUT_NEXT_LOOKUP;
165 vnet_feature_arc_start(mm->input_feature_arc_index,
166 sw_if_index1, &next1, b1);
167 vlib_increment_simple_counter (cm, thread_index, sw_if_index1, 1);
170 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
172 mpls_input_trace_t *tr = vlib_add_trace (vm, node,
174 tr->next_index = next0;
175 tr->label_net_byte_order = *((u32*)h0);
177 if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
179 mpls_input_trace_t *tr = vlib_add_trace (vm, node,
181 tr->next_index = next1;
182 tr->label_net_byte_order = *((u32*)h1);
185 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
186 to_next, n_left_to_next,
191 while (n_left_from > 0 && n_left_to_next > 0)
193 u32 sw_if_index0, next0, bi0;
204 b0 = vlib_get_buffer (vm, bi0);
205 h0 = vlib_buffer_get_current (b0);
206 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
209 if (PREDICT_FALSE(h0[3] == 0))
211 next0 = MPLS_INPUT_NEXT_DROP;
212 b0->error = node->errors[MPLS_ERROR_TTL_EXPIRED];
216 next0 = MPLS_INPUT_NEXT_LOOKUP;
217 vnet_feature_arc_start(mm->input_feature_arc_index, sw_if_index0, &next0, b0);
218 vlib_increment_simple_counter (cm, thread_index, sw_if_index0, 1);
221 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
223 mpls_input_trace_t *tr = vlib_add_trace (vm, node,
225 tr->next_index = next0;
226 tr->label_net_byte_order = *(u32*)h0;
229 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
230 to_next, n_left_to_next,
234 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
236 vlib_node_increment_counter (vm, mpls_input_node.index,
237 MPLS_ERROR_PKTS_DECAP, from_frame->n_vectors);
238 return from_frame->n_vectors;
242 mpls_input (vlib_main_t * vm,
243 vlib_node_runtime_t * node,
244 vlib_frame_t * from_frame)
246 return mpls_input_inline (vm, node, from_frame);
249 static char * mpls_error_strings[] = {
250 #define mpls_error(n,s) s,
255 VLIB_REGISTER_NODE (mpls_input_node) = {
256 .function = mpls_input,
257 .name = "mpls-input",
258 /* Takes a vector of packets. */
259 .vector_size = sizeof (u32),
261 .runtime_data_bytes = sizeof(mpls_input_runtime_t),
263 .n_errors = MPLS_N_ERROR,
264 .error_strings = mpls_error_strings,
266 .n_next_nodes = MPLS_INPUT_N_NEXT,
268 #define _(s,n) [MPLS_INPUT_NEXT_##s] = n,
269 foreach_mpls_input_next
273 .format_buffer = format_mpls_unicast_header_net_byte_order,
274 .format_trace = format_mpls_input_trace,
277 VLIB_NODE_FUNCTION_MULTIARCH (mpls_input_node, mpls_input)
280 mpls_setup_nodes (vlib_main_t * vm)
282 mpls_input_runtime_t * rt;
285 pn = pg_get_node (mpls_input_node.index);
286 pn->unformat_edit = unformat_pg_mpls_header;
288 rt = vlib_node_get_runtime_data (vm, mpls_input_node.index);
289 rt->last_label = (u32) ~0;
290 rt->last_inner_fib_index = 0;
291 rt->last_outer_fib_index = 0;
292 rt->mpls_main = &mpls_main;
294 ethernet_register_input_type (vm, ETHERNET_TYPE_MPLS,
295 mpls_input_node.index);
298 static clib_error_t * mpls_input_init (vlib_main_t * vm)
300 clib_error_t * error;
302 error = vlib_call_init_function (vm, mpls_init);
304 clib_error_report (error);
306 mpls_setup_nodes (vm);
311 VLIB_INIT_FUNCTION (mpls_input_init);
313 static clib_error_t * mpls_input_worker_init (vlib_main_t * vm)
315 mpls_input_runtime_t * rt;
316 rt = vlib_node_get_runtime_data (vm, mpls_input_node.index);
317 rt->last_label = (u32) ~0;
318 rt->last_inner_fib_index = 0;
319 rt->last_outer_fib_index = 0;
320 rt->mpls_main = &mpls_main;
324 VLIB_WORKER_INIT_FUNCTION (mpls_input_worker_init);