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>
33 /* per-pkt trace data */
36 u8 raw[12]; // raw data (vlans)
40 /* packet trace format function */
41 static u8 * format_l2_invtr_trace (u8 * s, va_list * args)
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_invtr_trace_t * t = va_arg (*args, l2_invtr_trace_t *);
47 s = format (s, "l2-input-vtr: sw_if_index %d dst %U src %U data "
48 "%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
50 format_ethernet_address, t->dst,
51 format_ethernet_address, t->src,
52 t->raw[0], t->raw[1], t->raw[2], t->raw[3], t->raw[4], t->raw[5],
53 t->raw[6], t->raw[7], t->raw[8], t->raw[9], t->raw[10], t->raw[11]);
57 l2_invtr_main_t l2_invtr_main;
59 static vlib_node_registration_t l2_invtr_node;
61 #define foreach_l2_invtr_error \
62 _(L2_INVTR, "L2 inverter packets") \
63 _(DROP, "L2 input tag rewrite drops")
66 #define _(sym,str) L2_INVTR_ERROR_##sym,
67 foreach_l2_invtr_error
72 static char * l2_invtr_error_strings[] = {
73 #define _(sym,string) string,
74 foreach_l2_invtr_error
85 l2_invtr_node_fn (vlib_main_t * vm,
86 vlib_node_runtime_t * node,
89 u32 n_left_from, * from, * to_next;
90 l2_invtr_next_t next_index;
91 l2_invtr_main_t * msm = &l2_invtr_main;
92 // vlib_node_t *n = vlib_get_node (vm, l2_invtr_node.index);
93 // u32 node_counter_base_index = n->error_heap_index;
94 // vlib_error_main_t * em = &vm->error_main;
96 from = vlib_frame_vector_args (frame);
97 n_left_from = frame->n_vectors; /* number of packets to process */
98 next_index = node->cached_next_index;
100 while (n_left_from > 0)
104 /* get space to enqueue frame to graph node "next_index" */
105 vlib_get_next_frame (vm, node, next_index,
106 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;
114 u32 feature_bitmap0, feature_bitmap1;
116 /* Prefetch next iteration. */
118 vlib_buffer_t * p2, * p3, * p4, * p5;
119 u32 sw_if_index2, sw_if_index3;
121 p2 = vlib_get_buffer (vm, from[2]);
122 p3 = vlib_get_buffer (vm, from[3]);
123 p4 = vlib_get_buffer (vm, from[4]);
124 p5 = vlib_get_buffer (vm, from[5]);
126 // Prefetch the buffer header and packet for the N+2 loop iteration
127 vlib_prefetch_buffer_header (p4, LOAD);
128 vlib_prefetch_buffer_header (p5, LOAD);
130 CLIB_PREFETCH (p4->data, CLIB_CACHE_LINE_BYTES, STORE);
131 CLIB_PREFETCH (p5->data, CLIB_CACHE_LINE_BYTES, STORE);
133 // Prefetch the input config for the N+1 loop iteration
134 // This depends on the buffer header above
135 sw_if_index2 = vnet_buffer(p2)->sw_if_index[VLIB_RX];
136 sw_if_index3 = vnet_buffer(p3)->sw_if_index[VLIB_RX];
137 CLIB_PREFETCH (vec_elt_at_index(l2output_main.configs, sw_if_index2), CLIB_CACHE_LINE_BYTES, LOAD);
138 CLIB_PREFETCH (vec_elt_at_index(l2output_main.configs, sw_if_index3), CLIB_CACHE_LINE_BYTES, LOAD);
141 /* speculatively enqueue b0 and b1 to the current next frame */
142 /* bi is "buffer index", b is pointer to the buffer */
143 to_next[0] = bi0 = from[0];
144 to_next[1] = bi1 = from[1];
150 b0 = vlib_get_buffer (vm, bi0);
151 b1 = vlib_get_buffer (vm, bi1);
153 /* RX interface handles */
154 sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
155 sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_RX];
158 // em->counters[node_counter_base_index + L2_INVTR_ERROR_L2_INVTR] += 2;
160 // Remove ourself from the feature bitmap
161 feature_bitmap0 = vnet_buffer(b0)->l2.feature_bitmap & ~L2INPUT_FEAT_VTR;
162 feature_bitmap1 = vnet_buffer(b1)->l2.feature_bitmap & ~L2INPUT_FEAT_VTR;
164 // save for next feature graph nodes
165 vnet_buffer(b0)->l2.feature_bitmap = feature_bitmap0;
166 vnet_buffer(b1)->l2.feature_bitmap = feature_bitmap1;
168 // Determine the next node
169 next0 = feat_bitmap_get_next_node_index(msm->feat_next_node_index,
171 next1 = feat_bitmap_get_next_node_index(msm->feat_next_node_index,
174 // perform the tag rewrite on two packets
175 if (l2_vtr_process(b0, &(vec_elt_at_index(l2output_main.configs, sw_if_index0)->input_vtr))) {
177 next0 = L2_INVTR_NEXT_DROP;
178 b0->error = node->errors[L2_INVTR_ERROR_DROP];
180 if (l2_vtr_process(b1, &(vec_elt_at_index(l2output_main.configs, sw_if_index1)->input_vtr))) {
182 next1 = L2_INVTR_NEXT_DROP;
183 b1->error = node->errors[L2_INVTR_ERROR_DROP];
186 if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE))) {
187 if (b0->flags & VLIB_BUFFER_IS_TRACED) {
188 l2_invtr_trace_t *t =
189 vlib_add_trace (vm, node, b0, sizeof (*t));
190 ethernet_header_t * h0 = vlib_buffer_get_current (b0);
191 t->sw_if_index = sw_if_index0;
192 clib_memcpy(t->src, h0->src_address, 6);
193 clib_memcpy(t->dst, h0->dst_address, 6);
194 clib_memcpy(t->raw, &h0->type, sizeof(t->raw));
196 if (b1->flags & VLIB_BUFFER_IS_TRACED) {
197 l2_invtr_trace_t *t =
198 vlib_add_trace (vm, node, b1, sizeof (*t));
199 ethernet_header_t * h1 = vlib_buffer_get_current (b1);
200 t->sw_if_index = sw_if_index0;
201 clib_memcpy(t->src, h1->src_address, 6);
202 clib_memcpy(t->dst, h1->dst_address, 6);
203 clib_memcpy(t->raw, &h1->type, sizeof(t->raw));
207 /* verify speculative enqueues, maybe switch current next frame */
208 /* if next0==next1==next_index then nothing special needs to be done */
209 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
210 to_next, n_left_to_next,
211 bi0, bi1, next0, next1);
214 while (n_left_from > 0 && n_left_to_next > 0)
222 /* speculatively enqueue b0 to the current next frame */
230 b0 = vlib_get_buffer (vm, bi0);
232 sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
235 // em->counters[node_counter_base_index + L2_INVTR_ERROR_L2_INVTR] += 1;
237 // Remove ourself from the feature bitmap
238 feature_bitmap0 = vnet_buffer(b0)->l2.feature_bitmap & ~L2INPUT_FEAT_VTR;
240 // save for next feature graph nodes
241 vnet_buffer(b0)->l2.feature_bitmap = feature_bitmap0;
243 // Determine the next node
244 next0 = feat_bitmap_get_next_node_index(msm->feat_next_node_index,
247 // perform the tag rewrite on one packet
248 if (l2_vtr_process(b0, &(vec_elt_at_index(l2output_main.configs, sw_if_index0)->input_vtr))) {
250 next0 = L2_INVTR_NEXT_DROP;
251 b0->error = node->errors[L2_INVTR_ERROR_DROP];
254 if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
255 && (b0->flags & VLIB_BUFFER_IS_TRACED))) {
256 l2_invtr_trace_t *t =
257 vlib_add_trace (vm, node, b0, sizeof (*t));
258 ethernet_header_t * h0 = vlib_buffer_get_current (b0);
259 t->sw_if_index = sw_if_index0;
260 clib_memcpy(t->src, h0->src_address, 6);
261 clib_memcpy(t->dst, h0->dst_address, 6);
262 clib_memcpy(t->raw, &h0->type, sizeof(t->raw));
265 /* verify speculative enqueue, maybe switch current next frame */
266 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
267 to_next, n_left_to_next,
271 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
274 return frame->n_vectors;
278 VLIB_REGISTER_NODE (l2_invtr_node,static) = {
279 .function = l2_invtr_node_fn,
280 .name = "l2-input-vtr",
281 .vector_size = sizeof (u32),
282 .format_trace = format_l2_invtr_trace,
283 .type = VLIB_NODE_TYPE_INTERNAL,
285 .n_errors = ARRAY_LEN(l2_invtr_error_strings),
286 .error_strings = l2_invtr_error_strings,
288 .n_next_nodes = L2_INVTR_N_NEXT,
290 /* edit / add dispositions here */
292 [L2_INVTR_NEXT_DROP] = "error-drop",
296 clib_error_t *l2_invtr_init (vlib_main_t *vm)
298 l2_invtr_main_t * mp = &l2_invtr_main;
301 mp->vnet_main = vnet_get_main();
303 // Initialize the feature next-node indexes
304 feat_bitmap_init_next_nodes(vm,
307 l2input_get_feat_names(),
308 mp->feat_next_node_index);
313 VLIB_INIT_FUNCTION (l2_invtr_init);