--- /dev/null
+/*
+ * l2_input_vtr.c : layer 2 input vlan tag rewrite processing
+ *
+ * Copyright (c) 2013 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <vlib/vlib.h>
+#include <vnet/vnet.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/ethernet/packet.h>
+#include <vnet/l2/l2_input.h>
+#include <vnet/l2/feat_bitmap.h>
+#include <vnet/l2/l2_vtr.h>
+#include <vnet/l2/l2_input_vtr.h>
+#include <vnet/l2/l2_output.h>
+
+#include <vppinfra/error.h>
+#include <vppinfra/cache.h>
+
+
+typedef struct {
+ /* per-pkt trace data */
+ u8 src[6];
+ u8 dst[6];
+ u8 raw[12]; // raw data (vlans)
+ u32 sw_if_index;
+} l2_invtr_trace_t;
+
+/* packet trace format function */
+static u8 * format_l2_invtr_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ l2_invtr_trace_t * t = va_arg (*args, l2_invtr_trace_t *);
+
+ s = format (s, "l2-input-vtr: sw_if_index %d dst %U src %U data "
+ "%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
+ t->sw_if_index,
+ format_ethernet_address, t->dst,
+ format_ethernet_address, t->src,
+ t->raw[0], t->raw[1], t->raw[2], t->raw[3], t->raw[4], t->raw[5],
+ t->raw[6], t->raw[7], t->raw[8], t->raw[9], t->raw[10], t->raw[11]);
+ return s;
+}
+
+l2_invtr_main_t l2_invtr_main;
+
+static vlib_node_registration_t l2_invtr_node;
+
+#define foreach_l2_invtr_error \
+_(L2_INVTR, "L2 inverter packets") \
+_(DROP, "L2 input tag rewrite drops")
+
+typedef enum {
+#define _(sym,str) L2_INVTR_ERROR_##sym,
+ foreach_l2_invtr_error
+#undef _
+ L2_INVTR_N_ERROR,
+} l2_invtr_error_t;
+
+static char * l2_invtr_error_strings[] = {
+#define _(sym,string) string,
+ foreach_l2_invtr_error
+#undef _
+};
+
+typedef enum {
+ L2_INVTR_NEXT_DROP,
+ L2_INVTR_N_NEXT,
+} l2_invtr_next_t;
+
+
+static uword
+l2_invtr_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ u32 n_left_from, * from, * to_next;
+ l2_invtr_next_t next_index;
+ l2_invtr_main_t * msm = &l2_invtr_main;
+ // vlib_node_t *n = vlib_get_node (vm, l2_invtr_node.index);
+ // u32 node_counter_base_index = n->error_heap_index;
+ // vlib_error_main_t * em = &vm->error_main;
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors; /* number of packets to process */
+ next_index = node->cached_next_index;
+
+ while (n_left_from > 0)
+ {
+ u32 n_left_to_next;
+
+ /* get space to enqueue frame to graph node "next_index" */
+ vlib_get_next_frame (vm, node, next_index,
+ to_next, n_left_to_next);
+
+ while (n_left_from >= 6 && n_left_to_next >= 2)
+ {
+ u32 bi0, bi1;
+ vlib_buffer_t * b0, * b1;
+ u32 next0, next1;
+ u32 sw_if_index0, sw_if_index1;
+ u32 feature_bitmap0, feature_bitmap1;
+
+ /* Prefetch next iteration. */
+ {
+ vlib_buffer_t * p2, * p3, * p4, * p5;
+ u32 sw_if_index2, sw_if_index3;
+
+ p2 = vlib_get_buffer (vm, from[2]);
+ p3 = vlib_get_buffer (vm, from[3]);
+ p4 = vlib_get_buffer (vm, from[4]);
+ p5 = vlib_get_buffer (vm, from[5]);
+
+ // Prefetch the buffer header and packet for the N+2 loop iteration
+ vlib_prefetch_buffer_header (p4, LOAD);
+ vlib_prefetch_buffer_header (p5, LOAD);
+
+ CLIB_PREFETCH (p4->data, CLIB_CACHE_LINE_BYTES, STORE);
+ CLIB_PREFETCH (p5->data, CLIB_CACHE_LINE_BYTES, STORE);
+
+ // Prefetch the input config for the N+1 loop iteration
+ // This depends on the buffer header above
+ sw_if_index2 = vnet_buffer(p2)->sw_if_index[VLIB_RX];
+ sw_if_index3 = vnet_buffer(p3)->sw_if_index[VLIB_RX];
+ CLIB_PREFETCH (vec_elt_at_index(l2output_main.configs, sw_if_index2), CLIB_CACHE_LINE_BYTES, LOAD);
+ CLIB_PREFETCH (vec_elt_at_index(l2output_main.configs, sw_if_index3), CLIB_CACHE_LINE_BYTES, LOAD);
+ }
+
+ /* speculatively enqueue b0 and b1 to the current next frame */
+ /* bi is "buffer index", b is pointer to the buffer */
+ to_next[0] = bi0 = from[0];
+ to_next[1] = bi1 = from[1];
+ from += 2;
+ to_next += 2;
+ n_left_from -= 2;
+ n_left_to_next -= 2;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ b1 = vlib_get_buffer (vm, bi1);
+
+ /* RX interface handles */
+ sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
+ sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_RX];
+
+ // process 2 packets
+ // em->counters[node_counter_base_index + L2_INVTR_ERROR_L2_INVTR] += 2;
+
+ // Remove ourself from the feature bitmap
+ feature_bitmap0 = vnet_buffer(b0)->l2.feature_bitmap & ~L2INPUT_FEAT_VTR;
+ feature_bitmap1 = vnet_buffer(b1)->l2.feature_bitmap & ~L2INPUT_FEAT_VTR;
+
+ // save for next feature graph nodes
+ vnet_buffer(b0)->l2.feature_bitmap = feature_bitmap0;
+ vnet_buffer(b1)->l2.feature_bitmap = feature_bitmap1;
+
+ // Determine the next node
+ next0 = feat_bitmap_get_next_node_index(msm->feat_next_node_index,
+ feature_bitmap0);
+ next1 = feat_bitmap_get_next_node_index(msm->feat_next_node_index,
+ feature_bitmap1);
+
+ // perform the tag rewrite on two packets
+ if (l2_vtr_process(b0, &(vec_elt_at_index(l2output_main.configs, sw_if_index0)->input_vtr))) {
+ // Drop packet
+ next0 = L2_INVTR_NEXT_DROP;
+ b0->error = node->errors[L2_INVTR_ERROR_DROP];
+ }
+ if (l2_vtr_process(b1, &(vec_elt_at_index(l2output_main.configs, sw_if_index1)->input_vtr))) {
+ // Drop packet
+ next1 = L2_INVTR_NEXT_DROP;
+ b1->error = node->errors[L2_INVTR_ERROR_DROP];
+ }
+
+ if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE))) {
+ if (b0->flags & VLIB_BUFFER_IS_TRACED) {
+ l2_invtr_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+ ethernet_header_t * h0 = vlib_buffer_get_current (b0);
+ t->sw_if_index = sw_if_index0;
+ memcpy(t->src, h0->src_address, 6);
+ memcpy(t->dst, h0->dst_address, 6);
+ memcpy(t->raw, &h0->type, sizeof(t->raw));
+ }
+ if (b1->flags & VLIB_BUFFER_IS_TRACED) {
+ l2_invtr_trace_t *t =
+ vlib_add_trace (vm, node, b1, sizeof (*t));
+ ethernet_header_t * h1 = vlib_buffer_get_current (b1);
+ t->sw_if_index = sw_if_index0;
+ memcpy(t->src, h1->src_address, 6);
+ memcpy(t->dst, h1->dst_address, 6);
+ memcpy(t->raw, &h1->type, sizeof(t->raw));
+ }
+ }
+
+ /* verify speculative enqueues, maybe switch current next frame */
+ /* if next0==next1==next_index then nothing special needs to be done */
+ vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, bi1, next0, next1);
+ }
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t * b0;
+ u32 next0;
+ u32 sw_if_index0;
+ u32 feature_bitmap0;
+
+ /* speculatively enqueue b0 to the current next frame */
+ bi0 = from[0];
+ to_next[0] = bi0;
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+
+ sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
+
+ // process 1 packet
+ // em->counters[node_counter_base_index + L2_INVTR_ERROR_L2_INVTR] += 1;
+
+ // Remove ourself from the feature bitmap
+ feature_bitmap0 = vnet_buffer(b0)->l2.feature_bitmap & ~L2INPUT_FEAT_VTR;
+
+ // save for next feature graph nodes
+ vnet_buffer(b0)->l2.feature_bitmap = feature_bitmap0;
+
+ // Determine the next node
+ next0 = feat_bitmap_get_next_node_index(msm->feat_next_node_index,
+ feature_bitmap0);
+
+ // perform the tag rewrite on one packet
+ if (l2_vtr_process(b0, &(vec_elt_at_index(l2output_main.configs, sw_if_index0)->input_vtr))) {
+ // Drop packet
+ next0 = L2_INVTR_NEXT_DROP;
+ b0->error = node->errors[L2_INVTR_ERROR_DROP];
+ }
+
+ if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED))) {
+ l2_invtr_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+ ethernet_header_t * h0 = vlib_buffer_get_current (b0);
+ t->sw_if_index = sw_if_index0;
+ memcpy(t->src, h0->src_address, 6);
+ memcpy(t->dst, h0->dst_address, 6);
+ memcpy(t->raw, &h0->type, sizeof(t->raw));
+ }
+
+ /* verify speculative enqueue, maybe switch current next frame */
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, next0);
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ return frame->n_vectors;
+}
+
+
+VLIB_REGISTER_NODE (l2_invtr_node,static) = {
+ .function = l2_invtr_node_fn,
+ .name = "l2-input-vtr",
+ .vector_size = sizeof (u32),
+ .format_trace = format_l2_invtr_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(l2_invtr_error_strings),
+ .error_strings = l2_invtr_error_strings,
+
+ .n_next_nodes = L2_INVTR_N_NEXT,
+
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [L2_INVTR_NEXT_DROP] = "error-drop",
+ },
+};
+
+clib_error_t *l2_invtr_init (vlib_main_t *vm)
+{
+ l2_invtr_main_t * mp = &l2_invtr_main;
+
+ mp->vlib_main = vm;
+ mp->vnet_main = vnet_get_main();
+
+ // Initialize the feature next-node indexes
+ feat_bitmap_init_next_nodes(vm,
+ l2_invtr_node.index,
+ L2INPUT_N_FEAT,
+ l2input_get_feat_names(),
+ mp->feat_next_node_index);
+
+ return 0;
+}
+
+VLIB_INIT_FUNCTION (l2_invtr_init);
+
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