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-rw-r--r--src/vnet/l2/l2_output.c708
1 files changed, 708 insertions, 0 deletions
diff --git a/src/vnet/l2/l2_output.c b/src/vnet/l2/l2_output.c
new file mode 100644
index 00000000000..953fcb0222a
--- /dev/null
+++ b/src/vnet/l2/l2_output.c
@@ -0,0 +1,708 @@
+/*
+ * l2_output.c : layer 2 output packet 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/pg/pg.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vlib/cli.h>
+
+#include <vppinfra/error.h>
+#include <vppinfra/hash.h>
+#include <vnet/l2/feat_bitmap.h>
+#include <vnet/l2/l2_output.h>
+
+
+/* Feature graph node names */
+static char *l2output_feat_names[] = {
+#define _(sym,name) name,
+ foreach_l2output_feat
+#undef _
+};
+
+char **
+l2output_get_feat_names (void)
+{
+ return l2output_feat_names;
+}
+
+l2output_main_t l2output_main;
+
+typedef struct
+{
+ /* per-pkt trace data */
+ u8 src[6];
+ u8 dst[6];
+ u32 sw_if_index;
+} l2output_trace_t;
+
+/* packet trace format function */
+static u8 *
+format_l2output_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 *);
+ l2output_trace_t *t = va_arg (*args, l2output_trace_t *);
+
+ s = format (s, "l2-output: sw_if_index %d dst %U src %U",
+ t->sw_if_index,
+ format_ethernet_address, t->dst,
+ format_ethernet_address, t->src);
+ return s;
+}
+
+
+static char *l2output_error_strings[] = {
+#define _(sym,string) string,
+ foreach_l2output_error
+#undef _
+};
+
+/**
+ * Check for split horizon violations.
+ * Return 0 if split horizon check passes, otherwise return non-zero.
+ * Packets should not be transmitted out an interface with the same
+ * split-horizon group as the input interface, except if the @c shg is 0
+ * in which case the check always passes.
+ */
+static_always_inline u32
+split_horizon_violation (u8 shg1, u8 shg2)
+{
+ if (PREDICT_TRUE (shg1 == 0))
+ {
+ return 0;
+ }
+ else
+ {
+ return shg1 == shg2;
+ }
+}
+
+static_always_inline void
+l2output_vtr (vlib_node_runtime_t * node, l2_output_config_t * config,
+ u32 feature_bitmap, vlib_buffer_t * b, u32 * next)
+{
+ if (PREDICT_FALSE (config->out_vtr_flag))
+ {
+ /* Perform pre-vtr EFP filter check if configured */
+ if (config->output_vtr.push_and_pop_bytes)
+ {
+ /*
+ * Perform output vlan tag rewrite and the pre-vtr EFP filter check.
+ * The EFP Filter only needs to be run if there is an output VTR
+ * configured. The flag for the post-vtr EFP Filter node is used
+ * to trigger the pre-vtr check as well.
+ */
+ u32 failed1 = (feature_bitmap & L2OUTPUT_FEAT_EFP_FILTER)
+ && (l2_efp_filter_process (b, &(config->input_vtr)));
+ u32 failed2 = l2_vtr_process (b, &(config->output_vtr));
+
+ if (PREDICT_FALSE (failed1 | failed2))
+ {
+ *next = L2OUTPUT_NEXT_DROP;
+ if (failed2)
+ {
+ b->error = node->errors[L2OUTPUT_ERROR_VTR_DROP];
+ }
+ if (failed1)
+ {
+ b->error = node->errors[L2OUTPUT_ERROR_EFP_DROP];
+ }
+ }
+ }
+ // perform the PBB rewrite
+ else if (config->output_pbb_vtr.push_and_pop_bytes)
+ {
+ u32 failed = l2_pbb_process (b, &(config->output_pbb_vtr));
+ if (PREDICT_FALSE (failed))
+ {
+ *next = L2OUTPUT_NEXT_DROP;
+ b->error = node->errors[L2OUTPUT_ERROR_VTR_DROP];
+ }
+ }
+ }
+}
+
+
+static vlib_node_registration_t l2output_node;
+
+static uword
+l2output_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ u32 n_left_from, *from, *to_next;
+ l2output_next_t next_index;
+ l2output_main_t *msm = &l2output_main;
+ u32 cached_sw_if_index;
+ u32 cached_next_index;
+
+ /* Invalidate cache */
+ cached_sw_if_index = ~0;
+ cached_next_index = ~0; /* warning be gone */
+
+ 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 >= 8 && n_left_to_next >= 4)
+ {
+ u32 bi0, bi1, bi2, bi3;
+ vlib_buffer_t *b0, *b1, *b2, *b3;
+ u32 next0, next1, next2, next3;
+ u32 sw_if_index0, sw_if_index1, sw_if_index2, sw_if_index3;
+ ethernet_header_t *h0, *h1, *h2, *h3;
+ l2_output_config_t *config0, *config1, *config2, *config3;
+ u32 feature_bitmap0, feature_bitmap1;
+ u32 feature_bitmap2, feature_bitmap3;
+
+ /* Prefetch next iteration. */
+ {
+ vlib_buffer_t *p4, *p5, *p6, *p7;
+
+ p4 = vlib_get_buffer (vm, from[4]);
+ p5 = vlib_get_buffer (vm, from[5]);
+ p6 = vlib_get_buffer (vm, from[6]);
+ p7 = vlib_get_buffer (vm, from[7]);
+
+ /* Prefetch the buffer header for the N+2 loop iteration */
+ vlib_prefetch_buffer_header (p4, LOAD);
+ vlib_prefetch_buffer_header (p5, LOAD);
+ vlib_prefetch_buffer_header (p6, LOAD);
+ vlib_prefetch_buffer_header (p7, 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];
+ to_next[2] = bi2 = from[2];
+ to_next[3] = bi3 = from[3];
+ from += 4;
+ to_next += 4;
+ n_left_from -= 4;
+ n_left_to_next -= 4;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ b1 = vlib_get_buffer (vm, bi1);
+ b2 = vlib_get_buffer (vm, bi2);
+ b3 = vlib_get_buffer (vm, bi3);
+
+ /* TX interface handles */
+ sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
+ sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_TX];
+ sw_if_index2 = vnet_buffer (b2)->sw_if_index[VLIB_TX];
+ sw_if_index3 = vnet_buffer (b3)->sw_if_index[VLIB_TX];
+
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
+ {
+ h0 = vlib_buffer_get_current (b0);
+ h1 = vlib_buffer_get_current (b1);
+ h2 = vlib_buffer_get_current (b2);
+ h3 = vlib_buffer_get_current (b3);
+ if (b0->flags & VLIB_BUFFER_IS_TRACED)
+ {
+ l2output_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->sw_if_index = sw_if_index0;
+ clib_memcpy (t->src, h0->src_address, 6);
+ clib_memcpy (t->dst, h0->dst_address, 6);
+ }
+ if (b1->flags & VLIB_BUFFER_IS_TRACED)
+ {
+ l2output_trace_t *t =
+ vlib_add_trace (vm, node, b1, sizeof (*t));
+ t->sw_if_index = sw_if_index1;
+ clib_memcpy (t->src, h1->src_address, 6);
+ clib_memcpy (t->dst, h1->dst_address, 6);
+ }
+ if (b2->flags & VLIB_BUFFER_IS_TRACED)
+ {
+ l2output_trace_t *t =
+ vlib_add_trace (vm, node, b2, sizeof (*t));
+ t->sw_if_index = sw_if_index2;
+ clib_memcpy (t->src, h2->src_address, 6);
+ clib_memcpy (t->dst, h2->dst_address, 6);
+ }
+ if (b3->flags & VLIB_BUFFER_IS_TRACED)
+ {
+ l2output_trace_t *t =
+ vlib_add_trace (vm, node, b3, sizeof (*t));
+ t->sw_if_index = sw_if_index3;
+ clib_memcpy (t->src, h3->src_address, 6);
+ clib_memcpy (t->dst, h3->dst_address, 6);
+ }
+ }
+
+ vlib_node_increment_counter (vm, l2output_node.index,
+ L2OUTPUT_ERROR_L2OUTPUT, 4);
+
+ /* Get config for the output interface */
+ config0 = vec_elt_at_index (msm->configs, sw_if_index0);
+ config1 = vec_elt_at_index (msm->configs, sw_if_index1);
+ config2 = vec_elt_at_index (msm->configs, sw_if_index2);
+ config3 = vec_elt_at_index (msm->configs, sw_if_index3);
+
+ /*
+ * Get features from the config
+ * TODO: mask out any non-applicable features
+ */
+ feature_bitmap0 = config0->feature_bitmap;
+ feature_bitmap1 = config1->feature_bitmap;
+ feature_bitmap2 = config2->feature_bitmap;
+ feature_bitmap3 = config3->feature_bitmap;
+
+ /* Determine next node */
+ l2_output_dispatch (msm->vlib_main,
+ msm->vnet_main,
+ node,
+ l2output_node.index,
+ &cached_sw_if_index,
+ &cached_next_index,
+ &msm->next_nodes,
+ b0, sw_if_index0, feature_bitmap0, &next0);
+
+ l2_output_dispatch (msm->vlib_main,
+ msm->vnet_main,
+ node,
+ l2output_node.index,
+ &cached_sw_if_index,
+ &cached_next_index,
+ &msm->next_nodes,
+ b1, sw_if_index1, feature_bitmap1, &next1);
+
+ l2_output_dispatch (msm->vlib_main,
+ msm->vnet_main,
+ node,
+ l2output_node.index,
+ &cached_sw_if_index,
+ &cached_next_index,
+ &msm->next_nodes,
+ b2, sw_if_index2, feature_bitmap2, &next2);
+
+ l2_output_dispatch (msm->vlib_main,
+ msm->vnet_main,
+ node,
+ l2output_node.index,
+ &cached_sw_if_index,
+ &cached_next_index,
+ &msm->next_nodes,
+ b3, sw_if_index3, feature_bitmap3, &next3);
+
+ l2output_vtr (node, config0, feature_bitmap0, b0, &next0);
+ l2output_vtr (node, config1, feature_bitmap1, b1, &next1);
+ l2output_vtr (node, config2, feature_bitmap2, b2, &next2);
+ l2output_vtr (node, config3, feature_bitmap3, b3, &next3);
+
+ /*
+ * Perform the split horizon check
+ * The check can only fail for non-zero shg's
+ */
+ if (PREDICT_FALSE (config0->shg + config1->shg +
+ config2->shg + config3->shg))
+ {
+ /* one of the checks might fail, check both */
+ if (split_horizon_violation
+ (config0->shg, vnet_buffer (b0)->l2.shg))
+ {
+ next0 = L2OUTPUT_NEXT_DROP;
+ b0->error = node->errors[L2OUTPUT_ERROR_SHG_DROP];
+ }
+ if (split_horizon_violation
+ (config1->shg, vnet_buffer (b1)->l2.shg))
+ {
+ next1 = L2OUTPUT_NEXT_DROP;
+ b1->error = node->errors[L2OUTPUT_ERROR_SHG_DROP];
+ }
+ if (split_horizon_violation
+ (config2->shg, vnet_buffer (b2)->l2.shg))
+ {
+ next2 = L2OUTPUT_NEXT_DROP;
+ b2->error = node->errors[L2OUTPUT_ERROR_SHG_DROP];
+ }
+ if (split_horizon_violation
+ (config3->shg, vnet_buffer (b3)->l2.shg))
+ {
+ next3 = L2OUTPUT_NEXT_DROP;
+ b3->error = node->errors[L2OUTPUT_ERROR_SHG_DROP];
+ }
+ }
+
+ /* verify speculative enqueues, maybe switch current next frame */
+ /* if next0==next1==next_index then nothing special needs to be done */
+ vlib_validate_buffer_enqueue_x4 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, bi1, bi2, bi3,
+ next0, next1, next2, next3);
+ }
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+ u32 next0;
+ u32 sw_if_index0;
+ ethernet_header_t *h0;
+ l2_output_config_t *config0;
+ 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_TX];
+
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ l2output_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->sw_if_index = sw_if_index0;
+ h0 = vlib_buffer_get_current (b0);
+ clib_memcpy (t->src, h0->src_address, 6);
+ clib_memcpy (t->dst, h0->dst_address, 6);
+ }
+
+ vlib_node_increment_counter (vm, l2output_node.index,
+ L2OUTPUT_ERROR_L2OUTPUT, 1);
+
+ /* Get config for the output interface */
+ config0 = vec_elt_at_index (msm->configs, sw_if_index0);
+
+ /*
+ * Get features from the config
+ * TODO: mask out any non-applicable features
+ */
+ feature_bitmap0 = config0->feature_bitmap;
+
+ /* Determine next node */
+ l2_output_dispatch (msm->vlib_main,
+ msm->vnet_main,
+ node,
+ l2output_node.index,
+ &cached_sw_if_index,
+ &cached_next_index,
+ &msm->next_nodes,
+ b0, sw_if_index0, feature_bitmap0, &next0);
+
+ l2output_vtr (node, config0, feature_bitmap0, b0, &next0);
+
+ /* Perform the split horizon check */
+ if (PREDICT_FALSE
+ (split_horizon_violation
+ (config0->shg, vnet_buffer (b0)->l2.shg)))
+ {
+ next0 = L2OUTPUT_NEXT_DROP;
+ b0->error = node->errors[L2OUTPUT_ERROR_SHG_DROP];
+ }
+
+ /* 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;
+}
+
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (l2output_node,static) = {
+ .function = l2output_node_fn,
+ .name = "l2-output",
+ .vector_size = sizeof (u32),
+ .format_trace = format_l2output_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(l2output_error_strings),
+ .error_strings = l2output_error_strings,
+
+ .n_next_nodes = L2OUTPUT_N_NEXT,
+
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [L2OUTPUT_NEXT_DROP] = "error-drop",
+ [L2OUTPUT_NEXT_BAD_INTF] = "l2-output-bad-intf",
+ },
+};
+/* *INDENT-ON* */
+
+
+#define foreach_l2output_bad_intf_error \
+_(DROP, "L2 output to interface not in L2 mode or deleted")
+
+static char *l2output_bad_intf_error_strings[] = {
+#define _(sym,string) string,
+ foreach_l2output_bad_intf_error
+#undef _
+};
+
+typedef enum
+{
+#define _(sym,str) L2OUTPUT_BAD_INTF_ERROR_##sym,
+ foreach_l2output_bad_intf_error
+#undef _
+ L2OUTPUT_BAD_INTF_N_ERROR,
+} l2output_bad_intf_error_t;
+
+
+/**
+ * Output node for interfaces/tunnels which was in L2 mode but were changed
+ * to L3 mode or possibly deleted thereafter. On changing forwarding mode
+ * of any tunnel/interface from L2 to L3, its entry in l2_output_main table
+ * next_nodes.output_node_index_vec[sw_if_index] MUST be set to the value of
+ * L2OUTPUT_NEXT_BAD_INTF. Thus, if there are stale entries in the L2FIB for
+ * this sw_if_index, l2-output will send packets for this sw_if_index to the
+ * l2-output-bad-intf node which just setup the proper drop reason before
+ * sending packets to the error-drop node to drop the packet. Then, stale L2FIB
+ * entries for delted tunnels won't cause possible packet or memory corrpution.
+ */
+static vlib_node_registration_t l2output_bad_intf_node;
+
+static uword
+l2output_bad_intf_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ u32 n_left_from, *from, *to_next;
+ l2output_next_t next_index = 0;
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors; /* number of packets to process */
+
+ 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 >= 4 && n_left_to_next >= 2)
+ {
+ u32 bi0, bi1;
+ vlib_buffer_t *b0, *b1;
+
+ 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);
+ b0->error = node->errors[L2OUTPUT_BAD_INTF_ERROR_DROP];
+ b1->error = node->errors[L2OUTPUT_BAD_INTF_ERROR_DROP];
+ }
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+
+ 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);
+ b0->error = node->errors[L2OUTPUT_BAD_INTF_ERROR_DROP];
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ return frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (l2output_bad_intf_node,static) = {
+ .function = l2output_bad_intf_node_fn,
+ .name = "l2-output-bad-intf",
+ .vector_size = sizeof (u32),
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(l2output_bad_intf_error_strings),
+ .error_strings = l2output_bad_intf_error_strings,
+
+ .n_next_nodes = 1,
+
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [0] = "error-drop",
+ },
+};
+/* *INDENT-ON* */
+
+
+VLIB_NODE_FUNCTION_MULTIARCH (l2output_node, l2output_node_fn)
+ clib_error_t *l2output_init (vlib_main_t * vm)
+{
+ l2output_main_t *mp = &l2output_main;
+
+ mp->vlib_main = vm;
+ mp->vnet_main = vnet_get_main ();
+
+ /* Create the config vector */
+ vec_validate (mp->configs, 100);
+ /* Until we hook up the CLI config, just create 100 sw interface entries and zero them */
+
+ /* Initialize the feature next-node indexes */
+ feat_bitmap_init_next_nodes (vm,
+ l2output_node.index,
+ L2OUTPUT_N_FEAT,
+ l2output_get_feat_names (),
+ mp->next_nodes.feat_next_node_index);
+
+ /* Initialize the output node mapping table */
+ l2output_init_output_node_vec (&mp->next_nodes.output_node_index_vec);
+
+ return 0;
+}
+
+VLIB_INIT_FUNCTION (l2output_init);
+
+typedef struct
+{
+ u32 node_index;
+ u32 sw_if_index;
+} output_node_mapping_rpc_args_t;
+
+static void output_node_rpc_callback (output_node_mapping_rpc_args_t * a);
+
+static void
+output_node_mapping_send_rpc (u32 node_index, u32 sw_if_index)
+{
+ output_node_mapping_rpc_args_t args;
+ void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length);
+
+ args.node_index = node_index;
+ args.sw_if_index = sw_if_index;
+
+ vl_api_rpc_call_main_thread (output_node_rpc_callback,
+ (u8 *) & args, sizeof (args));
+}
+
+
+/** Create a mapping in the next node mapping table for the given sw_if_index. */
+u32
+l2output_create_output_node_mapping (vlib_main_t * vlib_main, vnet_main_t * vnet_main, u32 node_index, /* index of current node */
+ u32 * output_node_index_vec,
+ u32 sw_if_index)
+{
+
+ u32 next; /* index of next graph node */
+ vnet_hw_interface_t *hw0;
+ u32 *node;
+
+ hw0 = vnet_get_sup_hw_interface (vnet_main, sw_if_index);
+
+ uword cpu_number;
+
+ cpu_number = os_get_cpu_number ();
+
+ if (cpu_number)
+ {
+ u32 oldflags;
+
+ oldflags = __sync_fetch_and_or (&hw0->flags,
+ VNET_HW_INTERFACE_FLAG_L2OUTPUT_MAPPED);
+
+ if ((oldflags & VNET_HW_INTERFACE_FLAG_L2OUTPUT_MAPPED))
+ return L2OUTPUT_NEXT_DROP;
+
+ output_node_mapping_send_rpc (node_index, sw_if_index);
+ return L2OUTPUT_NEXT_DROP;
+ }
+
+ /* dynamically create graph node arc */
+ next = vlib_node_add_next (vlib_main, node_index, hw0->output_node_index);
+
+ /* Initialize vector with the mapping */
+
+ node = vec_elt_at_index (output_node_index_vec, sw_if_index);
+ *node = next;
+
+ /* reset mapping bit, includes memory barrier */
+ __sync_fetch_and_and (&hw0->flags, ~VNET_HW_INTERFACE_FLAG_L2OUTPUT_MAPPED);
+
+ return next;
+}
+
+void
+output_node_rpc_callback (output_node_mapping_rpc_args_t * a)
+{
+ vlib_main_t *vm = vlib_get_main ();
+ vnet_main_t *vnm = vnet_get_main ();
+ l2output_main_t *mp = &l2output_main;
+
+ (void) l2output_create_output_node_mapping
+ (vm, vnm, a->node_index, mp->next_nodes.output_node_index_vec,
+ a->sw_if_index);
+}
+
+/* Get a pointer to the config for the given interface */
+l2_output_config_t *
+l2output_intf_config (u32 sw_if_index)
+{
+ l2output_main_t *mp = &l2output_main;
+
+ vec_validate (mp->configs, sw_if_index);
+ return vec_elt_at_index (mp->configs, sw_if_index);
+}
+
+/** Enable (or disable) the feature in the bitmap for the given interface. */
+void
+l2output_intf_bitmap_enable (u32 sw_if_index, u32 feature_bitmap, u32 enable)
+{
+ l2output_main_t *mp = &l2output_main;
+ l2_output_config_t *config;
+
+ vec_validate (mp->configs, sw_if_index);
+ config = vec_elt_at_index (mp->configs, sw_if_index);
+
+ if (enable)
+ {
+ config->feature_bitmap |= feature_bitmap;
+ }
+ else
+ {
+ config->feature_bitmap &= ~feature_bitmap;
+ }
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */