2 * l2_input_vtr.c : layer 2 input vlan tag rewrite processing
4 * Copyright (c) 2013 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/vnet.h>
20 #include <vnet/ethernet/ethernet.h>
21 #include <vnet/ethernet/packet.h>
22 #include <vnet/l2/l2_input.h>
23 #include <vnet/l2/feat_bitmap.h>
24 #include <vnet/l2/l2_vtr.h>
25 #include <vnet/l2/l2_input_vtr.h>
26 #include <vnet/l2/l2_output.h>
28 #include <vppinfra/error.h>
29 #include <vppinfra/cache.h>
34 /* per-pkt trace data */
37 u8 raw[12]; /* raw data (vlans) */
41 /* packet trace format function */
43 format_l2_invtr_trace (u8 * s, va_list * args)
45 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
46 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
47 l2_invtr_trace_t *t = va_arg (*args, l2_invtr_trace_t *);
49 s = format (s, "l2-input-vtr: sw_if_index %d dst %U src %U data "
50 "%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
52 format_ethernet_address, t->dst,
53 format_ethernet_address, t->src,
54 t->raw[0], t->raw[1], t->raw[2], t->raw[3], t->raw[4],
55 t->raw[5], t->raw[6], t->raw[7], t->raw[8], t->raw[9],
56 t->raw[10], t->raw[11]);
60 #ifndef CLIB_MARCH_VARIANT
61 l2_invtr_main_t l2_invtr_main;
62 #endif /* CLIB_MARCH_VARIANT */
64 #define foreach_l2_invtr_error \
65 _(L2_INVTR, "L2 inverter packets") \
66 _(DROP, "L2 input tag rewrite drops")
70 #define _(sym,str) L2_INVTR_ERROR_##sym,
71 foreach_l2_invtr_error
76 static char *l2_invtr_error_strings[] = {
77 #define _(sym,string) string,
78 foreach_l2_invtr_error
89 VLIB_NODE_FN (l2_invtr_node) (vlib_main_t * vm,
90 vlib_node_runtime_t * node,
93 u32 n_left_from, *from, *to_next;
94 l2_invtr_next_t next_index;
95 l2_invtr_main_t *msm = &l2_invtr_main;
97 from = vlib_frame_vector_args (frame);
98 n_left_from = frame->n_vectors; /* number of packets to process */
99 next_index = node->cached_next_index;
101 while (n_left_from > 0)
105 /* get space to enqueue frame to graph node "next_index" */
106 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
108 while (n_left_from >= 6 && n_left_to_next >= 2)
111 vlib_buffer_t *b0, *b1;
113 u32 sw_if_index0, sw_if_index1;
115 /* Prefetch next iteration. */
117 vlib_buffer_t *p2, *p3, *p4, *p5;
118 u32 sw_if_index2, sw_if_index3;
120 p2 = vlib_get_buffer (vm, from[2]);
121 p3 = vlib_get_buffer (vm, from[3]);
122 p4 = vlib_get_buffer (vm, from[4]);
123 p5 = vlib_get_buffer (vm, from[5]);
125 /* Prefetch the buffer header and packet for the N+2 loop iteration */
126 vlib_prefetch_buffer_header (p4, LOAD);
127 vlib_prefetch_buffer_header (p5, LOAD);
129 clib_prefetch_store (p4->data);
130 clib_prefetch_store (p5->data);
133 * Prefetch the input config for the N+1 loop iteration
134 * This depends on the buffer header above
136 sw_if_index2 = vnet_buffer (p2)->sw_if_index[VLIB_RX];
137 sw_if_index3 = vnet_buffer (p3)->sw_if_index[VLIB_RX];
138 CLIB_PREFETCH (vec_elt_at_index
139 (l2output_main.configs, sw_if_index2),
140 CLIB_CACHE_LINE_BYTES, LOAD);
141 CLIB_PREFETCH (vec_elt_at_index
142 (l2output_main.configs, sw_if_index3),
143 CLIB_CACHE_LINE_BYTES, LOAD);
146 /* speculatively enqueue b0 and b1 to the current next frame */
147 /* bi is "buffer index", b is pointer to the buffer */
148 to_next[0] = bi0 = from[0];
149 to_next[1] = bi1 = from[1];
155 b0 = vlib_get_buffer (vm, bi0);
156 b1 = vlib_get_buffer (vm, bi1);
158 /* RX interface handles */
159 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
160 sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
162 /* Determine the next node */
163 next0 = vnet_l2_feature_next (b0, msm->feat_next_node_index,
165 next1 = vnet_l2_feature_next (b1, msm->feat_next_node_index,
168 l2_output_config_t *config0;
169 l2_output_config_t *config1;
170 config0 = vec_elt_at_index (l2output_main.configs, sw_if_index0);
171 config1 = vec_elt_at_index (l2output_main.configs, sw_if_index1);
173 if (PREDICT_FALSE (config0->out_vtr_flag))
175 if (config0->output_vtr.push_and_pop_bytes)
177 /* perform the tag rewrite on two packets */
178 if (l2_vtr_process (b0, &config0->input_vtr))
181 next0 = L2_INVTR_NEXT_DROP;
182 b0->error = node->errors[L2_INVTR_ERROR_DROP];
185 else if (config0->output_pbb_vtr.push_and_pop_bytes)
187 if (l2_pbb_process (b0, &(config0->input_pbb_vtr)))
190 next0 = L2_INVTR_NEXT_DROP;
191 b0->error = node->errors[L2_INVTR_ERROR_DROP];
195 if (PREDICT_FALSE (config1->out_vtr_flag))
197 if (config1->output_vtr.push_and_pop_bytes)
199 if (l2_vtr_process (b1, &config1->input_vtr))
202 next1 = L2_INVTR_NEXT_DROP;
203 b1->error = node->errors[L2_INVTR_ERROR_DROP];
206 else if (config1->output_pbb_vtr.push_and_pop_bytes)
208 if (l2_pbb_process (b1, &(config1->input_pbb_vtr)))
211 next1 = L2_INVTR_NEXT_DROP;
212 b1->error = node->errors[L2_INVTR_ERROR_DROP];
217 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
219 if (b0->flags & VLIB_BUFFER_IS_TRACED)
221 l2_invtr_trace_t *t =
222 vlib_add_trace (vm, node, b0, sizeof (*t));
223 ethernet_header_t *h0 = vlib_buffer_get_current (b0);
224 t->sw_if_index = sw_if_index0;
225 clib_memcpy_fast (t->src, h0->src_address, 6);
226 clib_memcpy_fast (t->dst, h0->dst_address, 6);
227 clib_memcpy_fast (t->raw, &h0->type, sizeof (t->raw));
229 if (b1->flags & VLIB_BUFFER_IS_TRACED)
231 l2_invtr_trace_t *t =
232 vlib_add_trace (vm, node, b1, sizeof (*t));
233 ethernet_header_t *h1 = vlib_buffer_get_current (b1);
234 t->sw_if_index = sw_if_index0;
235 clib_memcpy_fast (t->src, h1->src_address, 6);
236 clib_memcpy_fast (t->dst, h1->dst_address, 6);
237 clib_memcpy_fast (t->raw, &h1->type, sizeof (t->raw));
241 /* verify speculative enqueues, maybe switch current next frame */
242 /* if next0==next1==next_index then nothing special needs to be done */
243 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
244 to_next, n_left_to_next,
245 bi0, bi1, next0, next1);
248 while (n_left_from > 0 && n_left_to_next > 0)
255 /* speculatively enqueue b0 to the current next frame */
263 b0 = vlib_get_buffer (vm, bi0);
265 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
267 /* Determine the next node */
268 next0 = vnet_l2_feature_next (b0, msm->feat_next_node_index,
271 l2_output_config_t *config0;
272 config0 = vec_elt_at_index (l2output_main.configs, sw_if_index0);
274 if (PREDICT_FALSE (config0->out_vtr_flag))
276 if (config0->output_vtr.push_and_pop_bytes)
278 /* perform the tag rewrite on one packet */
279 if (l2_vtr_process (b0, &config0->input_vtr))
282 next0 = L2_INVTR_NEXT_DROP;
283 b0->error = node->errors[L2_INVTR_ERROR_DROP];
286 else if (config0->output_pbb_vtr.push_and_pop_bytes)
288 if (l2_pbb_process (b0, &(config0->input_pbb_vtr)))
291 next0 = L2_INVTR_NEXT_DROP;
292 b0->error = node->errors[L2_INVTR_ERROR_DROP];
297 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
298 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
300 l2_invtr_trace_t *t =
301 vlib_add_trace (vm, node, b0, sizeof (*t));
302 ethernet_header_t *h0 = vlib_buffer_get_current (b0);
303 t->sw_if_index = sw_if_index0;
304 clib_memcpy_fast (t->src, h0->src_address, 6);
305 clib_memcpy_fast (t->dst, h0->dst_address, 6);
306 clib_memcpy_fast (t->raw, &h0->type, sizeof (t->raw));
309 /* verify speculative enqueue, maybe switch current next frame */
310 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
311 to_next, n_left_to_next,
315 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
318 return frame->n_vectors;
323 VLIB_REGISTER_NODE (l2_invtr_node) = {
324 .name = "l2-input-vtr",
325 .vector_size = sizeof (u32),
326 .format_trace = format_l2_invtr_trace,
327 .type = VLIB_NODE_TYPE_INTERNAL,
329 .n_errors = ARRAY_LEN(l2_invtr_error_strings),
330 .error_strings = l2_invtr_error_strings,
332 .n_next_nodes = L2_INVTR_N_NEXT,
334 /* edit / add dispositions here */
336 [L2_INVTR_NEXT_DROP] = "error-drop",
341 #ifndef CLIB_MARCH_VARIANT
343 l2_invtr_init (vlib_main_t * vm)
345 l2_invtr_main_t *mp = &l2_invtr_main;
348 mp->vnet_main = vnet_get_main ();
350 /* Initialize the feature next-node indexes */
351 feat_bitmap_init_next_nodes (vm,
354 l2input_get_feat_names (),
355 mp->feat_next_node_index);
360 VLIB_INIT_FUNCTION (l2_invtr_init);
361 #endif /* CLIB_MARCH_VARIANT */
365 * fd.io coding-style-patch-verification: ON
368 * eval: (c-set-style "gnu")