text: /*
   * Copyright (c) 2015 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.
   */
  /*
   * node.h: VLIB processing nodes
   *
   * Copyright (c) 2008 Eliot Dresselhaus
   *
   * Permission is hereby granted, free of charge, to any person obtaining
   * a copy of this software and associated documentation files (the
   * "Software"), to deal in the Software without restriction, including
   * without limitation the rights to use, copy, modify, merge, publish,
   * distribute, sublicense, and/or sell copies of the Software, and to
   * permit persons to whom the Software is furnished to do so, subject to
   * the following conditions:
   *
   * The above copyright notice and this permission notice shall be
   * included in all copies or substantial portions of the Software.
   *
   *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
   *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
   *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
   *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   */
  
  #ifndef included_vlib_node_h
  #define included_vlib_node_h
  
  #include <vppinfra/cpu.h>
  #include <vppinfra/longjmp.h>
  #include <vppinfra/lock.h>
  #include <vlib/trace.h>		/* for vlib_trace_filter_t */
  
  /* Forward declaration. */
  struct vlib_node_runtime_t;
  struct vlib_frame_t;
  
  /* Internal nodes (including output nodes) move data from node to
     node (or out of the graph for output nodes). */
  typedef uword (vlib_node_function_t) (struct vlib_main_t * vm,
  				      struct vlib_node_runtime_t * node,
  				      struct vlib_frame_t * frame);
  
  typedef enum
  {
    VLIB_NODE_PROTO_HINT_NONE = 0,
    VLIB_NODE_PROTO_HINT_ETHERNET,
    VLIB_NODE_PROTO_HINT_IP4,
    VLIB_NODE_PROTO_HINT_IP6,
    VLIB_NODE_PROTO_HINT_TCP,
    VLIB_NODE_PROTO_HINT_UDP,
    VLIB_NODE_N_PROTO_HINTS,
  } vlib_node_proto_hint_t;
  
  typedef enum
  {
    /* An internal node on the call graph (could be output). */
    VLIB_NODE_TYPE_INTERNAL,
  
    /* Nodes which input data into the processing graph.
       Input nodes are called for each iteration of main loop. */
    VLIB_NODE_TYPE_INPUT,
  
    /* Nodes to be called before all input nodes.
       Used, for example, to clean out driver TX rings before
       processing input. */
    VLIB_NODE_TYPE_PRE_INPUT,
  
    /* "Process" nodes which can be suspended and later resumed. */
    VLIB_NODE_TYPE_PROCESS,
  
    VLIB_N_NODE_TYPE,
  } vlib_node_type_t;
  
  typedef struct _vlib_node_fn_registration
  {
    vlib_node_function_t *function;
    clib_march_variant_type_t march_variant;
    struct _vlib_node_fn_registration *next_registration;
  } vlib_node_fn_registration_t;
  
  typedef struct _vlib_node_registration
  {
    /* Vector processing function for this node. */
    vlib_node_function_t *function;
  
    /* Node function candidate registration with priority */
    vlib_node_fn_registration_t *node_fn_registrations;
  
    /* Node name. */
    char *name;
  
    /* Name of sibling (if applicable). */
    char *sibling_of;
  
    /* Node index filled in by registration. */
    u32 index;
  
    /* Type of this node. */
    vlib_node_type_t type;
  
    /* Error strings indexed by error code for this node. */
    char **error_strings;
    vlib_error_desc_t *error_counters;
  
    /* Buffer format/unformat for this node. */
    format_function_t *format_buffer;
    unformat_function_t *unformat_buffer;
  
    /* Trace format/unformat for this node. */
    format_function_t *format_trace;
    unformat_function_t *unformat_trace;
  
    /* Function to validate incoming frames. */
    u8 *(*validate_frame) (struct vlib_main_t * vm,
  			 struct vlib_node_runtime_t *,
  			 struct vlib_frame_t * f);
  
    /* Per-node runtime data. */
    void *runtime_data;
  
    /* Process stack size. */
    u16 process_log2_n_stack_bytes;
  
    /* Number of bytes of per-node run time data. */
    u8 runtime_data_bytes;
  
    /* State for input nodes. */
    u8 state;
  
    /* Node flags. */
    u16 flags;
  
    /* protocol at b->data[b->current_data] upon entry to the dispatch fn */
    u8 protocol_hint;
  
    /* Size of scalar and vector arguments in bytes. */
    u8 scalar_size, vector_size, aux_size;
  
    /* Number of error codes used by this node. */
    u16 n_errors;
  
    /* Number of next node names that follow. */
    u16 n_next_nodes;
  
    /* Constructor link-list, don't ask... */
    struct _vlib_node_registration *next_registration;
  
    /* Names of next nodes which this node feeds into. */
    char *next_nodes[];
  
  } vlib_node_registration_t;
  
  #ifndef CLIB_MARCH_VARIANT
  #define VLIB_REGISTER_NODE(x, ...)                                            \
    __VA_ARGS__ vlib_node_registration_t x;                                     \
    static void __vlib_add_node_registration_##x (void)                         \
      __attribute__ ((__constructor__));                                        \
    static void __vlib_add_node_registration_##x (void)                         \
    {                                                                           \
      vlib_global_main_t *vgm = vlib_get_global_main ();                        \
      x.next_registration = vgm->node_registrations;                            \
      vgm->node_registrations = &x;                                             \
    }                                                                           \
    static void __vlib_rm_node_registration_##x (void)                          \
      __attribute__ ((__destructor__));                                         \
    static void __vlib_rm_node_registration_##x (void)                          \
    {                                                                           \
      vlib_global_main_t *vgm = vlib_get_global_main ();                        \
      VLIB_REMOVE_FROM_LINKED_LIST (vgm->node_registrations, &x,                \
  				  next_registration);                         \
    }                                                                           \
    __VA_ARGS__ vlib_node_registration_t x
  #else
  #define VLIB_REGISTER_NODE(x,...)                                       \
  STATIC_ASSERT (sizeof(# __VA_ARGS__) != 7,"node " #x " must not be declared as static"); \
  static __clib_unused vlib_node_registration_t __clib_unused_##x
  #endif
  
  #ifndef CLIB_MARCH_VARIANT
  #define CLIB_MARCH_VARIANT_STR "default"
  #else
  #define _CLIB_MARCH_VARIANT_STR(s) __CLIB_MARCH_VARIANT_STR(s)
  #define __CLIB_MARCH_VARIANT_STR(s) #s
  #define CLIB_MARCH_VARIANT_STR _CLIB_MARCH_VARIANT_STR(CLIB_MARCH_VARIANT)
  #endif
  
  #define VLIB_NODE_FN(node)                                                    \
    uword CLIB_MARCH_SFX (node##_fn) ();                                        \
    static vlib_node_fn_registration_t CLIB_MARCH_SFX (                         \
      node##_fn_registration) = {                                               \
      .function = &CLIB_MARCH_SFX (node##_fn),                                  \
    };                                                                          \
                                                                                \
    static void __clib_constructor CLIB_MARCH_SFX (node##_multiarch_register) ( \
      void)                                                                     \
    {                                                                           \
      extern vlib_node_registration_t node;                                     \
      vlib_node_fn_registration_t *r;                                           \
      r = &CLIB_MARCH_SFX (node##_fn_registration);                             \
      r->march_variant = CLIB_MARCH_SFX (CLIB_MARCH_VARIANT_TYPE);              \
      r->next_registration = node.node_fn_registrations;                        \
      node.node_fn_registrations = r;                                           \
    }                                                                           \
    uword CLIB_MARCH_SFX (node##_fn)
  
  unformat_function_t unformat_vlib_node_variant;
  
  typedef struct
  {
    /* Total calls, clock ticks and vector elements processed for this node. */
    u64 calls, vectors, clocks, suspends;
    u64 max_clock;
    u64 max_clock_n;
  } vlib_node_stats_t;
  
  #define foreach_vlib_node_state					\
    /* Input node is called each iteration of main loop.		\
       This is the default (zero). */				\
    _ (POLLING)							\
    /* Input node is called when device signals an interrupt. */	\
    _ (INTERRUPT)							\
    /* Input node is never called. */				\
    _ (DISABLED)
  
  typedef enum
  {
  #define _(f) VLIB_NODE_STATE_##f,
    foreach_vlib_node_state
  #undef _
      VLIB_N_NODE_STATE,
  } vlib_node_state_t;
  
  typedef struct vlib_node_t
  {
    /* Vector processing function for this node. */
    vlib_node_function_t *function;
  
    /* Node name. */
    u8 *name;
  
    /* Node name index in elog string table. */
    u32 name_elog_string;
  
    /* Total statistics for this node. */
    vlib_node_stats_t stats_total;
  
    /* Saved values as of last clear (or zero if never cleared).
       Current values are always stats_total - stats_last_clear. */
    vlib_node_stats_t stats_last_clear;
  
    /* Type of this node. */
    vlib_node_type_t type;
  
    /* Node index. */
    u32 index;
  
    /* Index of corresponding node runtime. */
    u32 runtime_index;
  
    /* Runtime data for this node. */
    void *runtime_data;
  
    /* Node flags. */
    u16 flags;
  
    /* Processing function keeps frame.  Tells node dispatching code not
       to free frame after dispatch is done.  */
  #define VLIB_NODE_FLAG_FRAME_NO_FREE_AFTER_DISPATCH (1 << 0)
  
    /* Node counts as output/drop/punt node for stats purposes. */
  #define VLIB_NODE_FLAG_IS_OUTPUT (1 << 1)
  #define VLIB_NODE_FLAG_IS_DROP (1 << 2)
  #define VLIB_NODE_FLAG_IS_PUNT (1 << 3)
  #define VLIB_NODE_FLAG_IS_HANDOFF (1 << 4)
  
    /* Set if current node runtime has traced vectors. */
  #define VLIB_NODE_FLAG_TRACE (1 << 5)
  
  #define VLIB_NODE_FLAG_SWITCH_FROM_INTERRUPT_TO_POLLING_MODE (1 << 6)
  #define VLIB_NODE_FLAG_SWITCH_FROM_POLLING_TO_INTERRUPT_MODE (1 << 7)
  #define VLIB_NODE_FLAG_TRACE_SUPPORTED (1 << 8)
  #define VLIB_NODE_FLAG_ADAPTIVE_MODE			     (1 << 9)
  
    /* State for input nodes. */
    u8 state;
  
    /* Number of bytes of run time data. */
    u8 runtime_data_bytes;
  
    /* protocol at b->data[b->current_data] upon entry to the dispatch fn */
    u8 protocol_hint;
  
    /* Number of error codes used by this node. */
    u16 n_errors;
  
    /* Size of scalar and vector arguments in bytes. */
    u16 frame_size, scalar_offset, vector_offset, magic_offset, aux_offset;
    u16 frame_size_index;
  
    /* Handle/index in error heap for this node. */
    u32 error_heap_handle;
    u32 error_heap_index;
  
    /* Counter structures indexed by counter code for this node. */
    vlib_error_desc_t *error_counters;
  
    /* Vector of next node names.
       Only used before next_nodes array is initialized. */
    char **next_node_names;
  
    /* Next node indices for this node. */
    u32 *next_nodes;
  
    /* Name of node that we are sibling of. */
    char *sibling_of;
  
    /* Bitmap of all of this node's siblings. */
    uword *sibling_bitmap;
  
    /* Total number of vectors sent to each next node. */
    u64 *n_vectors_by_next_node;
  
    /* Hash table mapping next node index into slot in
       next_nodes vector.  Quickly determines whether this node
       is connected to given next node and, if so, with which slot. */
    uword *next_slot_by_node;
  
    /* Bitmap of node indices which feed this node. */
    uword *prev_node_bitmap;
  
    /* Node/next-index which own enqueue rights with to this node. */
    u32 owner_node_index, owner_next_index;
  
    /* Buffer format/unformat for this node. */
    format_function_t *format_buffer;
    unformat_function_t *unformat_buffer;
  
    /* Trace buffer format/unformat for this node. */
    format_function_t *format_trace;
  
    /* Function to validate incoming frames. */
    u8 *(*validate_frame) (struct vlib_main_t * vm,
  			 struct vlib_node_runtime_t *,
  			 struct vlib_frame_t * f);
    /* for pretty-printing, not typically valid */
    u8 *state_string;
  
    /* Node function candidate registration with priority */
    vlib_node_fn_registration_t *node_fn_registrations;
  } vlib_node_t;
  
  #define VLIB_INVALID_NODE_INDEX ((u32) ~0)
  
  /* Max number of vector elements to process at once per node. */
  #define VLIB_FRAME_SIZE 256
  /* Number of extra elements allocated at the end of vecttor. */
  #define VLIB_FRAME_SIZE_EXTRA 4
  /* Frame data alignment */
  #define VLIB_FRAME_DATA_ALIGN 16
  
  /* Calling frame (think stack frame) for a node. */
  typedef struct vlib_frame_t
  {
    /* Frame flags. */
    u16 frame_flags;
  
    /* User flags. Used for sending hints to the next node. */
    u16 flags;
  
    /* Scalar, vector and aux offsets in this frame. */
    u16 scalar_offset, vector_offset, aux_offset;
  
    /* Number of vector elements currently in frame. */
    u16 n_vectors;
  
    /* Scalar and vector arguments to next node. */
    u8 arguments[0];
  } vlib_frame_t;
  
  typedef struct
  {
    /* Frame pointer. */
    vlib_frame_t *frame;
  
    /* Node runtime for this next. */
    u32 node_runtime_index;
  
    /* Next frame flags. */
    u32 flags;
  
    /* Reflects node frame-used flag for this next. */
  #define VLIB_FRAME_NO_FREE_AFTER_DISPATCH \
    VLIB_NODE_FLAG_FRAME_NO_FREE_AFTER_DISPATCH
  
    /* Don't append this frame */
  #define VLIB_FRAME_NO_APPEND (1 << 14)
  
    /* This next frame owns enqueue to node
       corresponding to node_runtime_index. */
  #define VLIB_FRAME_OWNER (1 << 15)
  
    /* Set when frame has been allocated for this next. */
  #define VLIB_FRAME_IS_ALLOCATED	VLIB_NODE_FLAG_IS_OUTPUT
  
    /* Set when frame has been added to pending vector. */
  #define VLIB_FRAME_PENDING VLIB_NODE_FLAG_IS_DROP
  
    /* Set when frame is to be freed after dispatch. */
  #define VLIB_FRAME_FREE_AFTER_DISPATCH VLIB_NODE_FLAG_IS_PUNT
  
    /* Set when frame has traced packets. */
  #define VLIB_FRAME_TRACE VLIB_NODE_FLAG_TRACE
  
    /* Number of vectors enqueue to this next since last overflow. */
    u32 vectors_since_last_overflow;
  } vlib_next_frame_t;
  
  always_inline void
  vlib_next_frame_init (vlib_next_frame_t * nf)
  {
    clib_memset (nf, 0, sizeof (nf[0]));
    nf->node_runtime_index = ~0;
  }
  
  /* A frame pending dispatch by main loop. */
  typedef struct
  {
    /* Frame index (in the heap). */
    vlib_frame_t *frame;
  
    /* Node and runtime for this frame. */
    u32 node_runtime_index;
  
    /* Start of next frames for this node. */
    u32 next_frame_index;
  
    /* Special value for next_frame_index when there is no next frame. */
  #define VLIB_PENDING_FRAME_NO_NEXT_FRAME ((u32) ~0)
  } vlib_pending_frame_t;
  
  typedef struct vlib_node_runtime_t
  {
    CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);	/**< cacheline mark */
  
    vlib_node_function_t *function;	/**< Node function to call. */
  
    vlib_error_t *errors;			/**< Vector of errors for this node. */
  
    u32 clocks_since_last_overflow;	/**< Number of clock cycles. */
  
    u32 max_clock;			/**< Maximum clock cycle for an
  					  invocation. */
  
    u32 max_clock_n;			/**< Number of vectors in the recorded
  					  max_clock. */
  
    u32 calls_since_last_overflow;	/**< Number of calls. */
  
    u32 vectors_since_last_overflow;	/**< Number of vector elements
  					  processed by this node. */
  
    u32 next_frame_index;			/**< Start of next frames for this
  					  node. */
  
    u32 node_index;			/**< Node index. */
  
    u32 input_main_loops_per_call;	/**< For input nodes: decremented
  					  on each main loop interation until
  					  it reaches zero and function is
  					  called.  Allows some input nodes to
  					  be called more than others. */
  
    u32 main_loop_count_last_dispatch;	/**< Saved main loop counter of last
  					  dispatch of this node. */
  
    u32 main_loop_vector_stats[2];
  
    u16 flags;				/**< Copy of main node flags. */
  
    u16 state;				/**< Input node state. */
  
    u16 n_next_nodes;
  
    u16 cached_next_index;		/**< Next frame index that vector
  					  arguments were last enqueued to
  					  last time this node ran. Set to
  					  zero before first run of this
  					  node. */
  
    u16 thread_index;			/**< thread this node runs on */
  
    u8 runtime_data[0];			/**< Function dependent
  					  node-runtime data. This data is
  					  thread local, and it is not
  					  cloned from main thread. It needs
  					  to be initialized for each thread
  					  before it is used unless
  					  runtime_data template exists in
  					  vlib_node_t. */
  }
  vlib_node_runtime_t;
  
  #define VLIB_NODE_RUNTIME_DATA_SIZE	(sizeof (vlib_node_runtime_t) - STRUCT_OFFSET_OF (vlib_node_runtime_t, runtime_data))
  
  typedef struct
  {
    /* Number of allocated frames for this scalar/vector size. */
    u32 n_alloc_frames;
  
    /* Frame size */
    u16 frame_size;
  
    /* Vector of free frames for this scalar/vector size. */
    vlib_frame_t **free_frames;
  } vlib_frame_size_t;
  
  STATIC_ASSERT_SIZEOF (vlib_frame_size_t, 16);
  
  typedef struct
  {
    /* Users opaque value for event type. */
    uword opaque;
  } vlib_process_event_type_t;
  
  typedef struct
  {
    CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
    /* Node runtime for this process. */
    vlib_node_runtime_t node_runtime;
  
    /* Where to longjmp when process is done. */
    clib_longjmp_t return_longjmp;
  
  #define VLIB_PROCESS_RETURN_LONGJMP_RETURN ((uword) ~0 - 0)
  #define VLIB_PROCESS_RETURN_LONGJMP_SUSPEND ((uword) ~0 - 1)
  
    /* Where to longjmp to resume node after suspend. */
    clib_longjmp_t resume_longjmp;
  #define VLIB_PROCESS_RESUME_LONGJMP_SUSPEND 0
  #define VLIB_PROCESS_RESUME_LONGJMP_RESUME  1
  
    u16 flags;
  #define VLIB_PROCESS_IS_SUSPENDED_WAITING_FOR_CLOCK (1 << 0)
  #define VLIB_PROCESS_IS_SUSPENDED_WAITING_FOR_EVENT (1 << 1)
    /* Set to indicate that this process has been added to resume vector. */
  #define VLIB_PROCESS_RESUME_PENDING (1 << 2)
  
    /* Process function is currently running. */
  #define VLIB_PROCESS_IS_RUNNING (1 << 3)
  
    /* Size of process stack. */
    u16 log2_n_stack_bytes;
  
    u32 suspended_process_frame_index;
  
    /* Number of times this process was suspended. */
    u32 n_suspends;
  
    /* Vectors of pending event data indexed by event type index. */
    void **pending_event_data_by_type_index;
  
    /* Bitmap of event type-indices with non-empty vectors. */
    uword *non_empty_event_type_bitmap;
  
    /* Bitmap of event type-indices which are one time events. */
    uword *one_time_event_type_bitmap;
  
    /* Type is opaque pointer -- typically a pointer to an event handler
       function.  Hash table to map opaque to a type index. */
    uword *event_type_index_by_type_opaque;
  
    /* Pool of currently valid event types. */
    vlib_process_event_type_t *event_type_pool;
  
    /*
     * When suspending saves clock time (10us ticks) when process
     * is to be resumed.
     */
    u64 resume_clock_interval;
  
    /* Handle from timer code, to cancel an unexpired timer */
    u32 stop_timer_handle;
  
    /* Default output function and its argument for any CLI outputs
       within the process. */
    vlib_cli_output_function_t *output_function;
    uword output_function_arg;
  
    /* Process stack */
  #define VLIB_PROCESS_STACK_MAGIC (0xdead7ead)
    u32 *stack;
  } vlib_process_t;
  
  typedef struct
  {
    u32 node_index;
  
    u32 one_time_event;
  } vlib_one_time_waiting_process_t;
  
  typedef struct
  {
    u16 n_data_elts;
  
    u16 n_data_elt_bytes;
  
    /* n_data_elts * n_data_elt_bytes */
    u32 n_data_bytes;
  
    /* Process node & event type to be used to signal event. */
    u32 process_node_index;
  
    u32 event_type_index;
  
    union
    {
      u8 inline_event_data[64 - 3 * sizeof (u32) - 2 * sizeof (u16)];
  
      /* Vector of event data used only when data does not fit inline. */
      u8 *event_data_as_vector;
    };
  }
  vlib_signal_timed_event_data_t;
  
  always_inline uword
  vlib_timing_wheel_data_is_timed_event (u32 d)
  {
    return d & 1;
  }
  
  always_inline u32
  vlib_timing_wheel_data_set_suspended_process (u32 i)
  {
    return 0 + 2 * i;
  }
  
  always_inline u32
  vlib_timing_wheel_data_set_timed_event (u32 i)
  {
    return 1 + 2 * i;
  }
  
  always_inline uword
  vlib_timing_wheel_data_get_index (u32 d)
  {
    return d / 2;
  }
  
  typedef struct
  {
    clib_march_variant_type_t index;
    int priority;
    char *suffix;
    char *desc;
  } vlib_node_fn_variant_t;
  
  typedef struct
  {
    /* Public nodes. */
    vlib_node_t **nodes;
  
    /* Node index hashed by node name. */
    uword *node_by_name;
  
    u32 flags;
  #define VLIB_NODE_MAIN_RUNTIME_STARTED (1 << 0)
  
    /* Nodes segregated by type for cache locality.
       Does not apply to nodes of type VLIB_NODE_TYPE_INTERNAL. */
    vlib_node_runtime_t *nodes_by_type[VLIB_N_NODE_TYPE];
  
    /* Node runtime indices for input nodes with pending interrupts. */
    void *interrupts;
    volatile u32 *pending_interrupts;
  
    /* Input nodes are switched from/to interrupt to/from polling mode
       when average vector length goes above/below polling/interrupt
       thresholds. */
    u32 polling_threshold_vector_length;
    u32 interrupt_threshold_vector_length;
  
    /* Vector of next frames. */
    vlib_next_frame_t *next_frames;
  
    /* Vector of internal node's frames waiting to be called. */
    vlib_pending_frame_t *pending_frames;
  
    /* Timing wheel for scheduling time-based node dispatch. */
    void *timing_wheel;
  
    vlib_signal_timed_event_data_t *signal_timed_event_data_pool;
  
    /* Opaque data vector added via timing_wheel_advance. */
    u32 *data_from_advancing_timing_wheel;
  
    /* CPU time of next process to be ready on timing wheel. */
    f64 time_next_process_ready;
  
    /* Vector of process nodes.
       One for each node of type VLIB_NODE_TYPE_PROCESS. */
    vlib_process_t **processes;
  
    /* Current running process or ~0 if no process running. */
    u32 current_process_index;
  
    /* Pool of pending process frames. */
    vlib_pending_frame_t *suspended_process_frames;
  
    /* Vector of event data vectors pending recycle. */
    void **recycled_event_data_vectors;
  
    /* Current counts of nodes in each state. */
    u32 input_node_counts_by_state[VLIB_N_NODE_STATE];
  
    /* Per-size frame allocation information. */
    vlib_frame_size_t *frame_sizes;
  
    /* Time of last node runtime stats clear. */
    f64 time_last_runtime_stats_clear;
  
    /* Node index from error code */
    u32 *node_by_error;
  
    /* Node Function Variants */
    vlib_node_fn_variant_t *variants;
  
    /* Node Function Default Variant Index */
    u32 node_fn_default_march_variant;
  
    /* Node Function march Variant by Suffix Hash */
    uword *node_fn_march_variant_by_suffix;
  } vlib_node_main_t;
  
  typedef u16 vlib_error_t;
  
  always_inline u32
  vlib_error_get_node (vlib_node_main_t * nm, vlib_error_t e)
  {
    return nm->node_by_error[e];
  }
  
  always_inline u32
  vlib_error_get_code (vlib_node_main_t * nm, vlib_error_t e)
  {
    u32 node_index = nm->node_by_error[e];
    vlib_node_t *n = nm->nodes[node_index];
    u32 error_code = e - n->error_heap_index;
    return error_code;
  }
  
  #define FRAME_QUEUE_MAX_NELTS 64
  typedef struct
  {
    CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
    u64 head;
    u64 tail;
    u32 n_in_use;
    u32 nelts;
    u32 written;
    u32 threshold;
    i32 n_vectors[FRAME_QUEUE_MAX_NELTS];
  } frame_queue_trace_t;
  
  typedef struct
  {
    u64 count[FRAME_QUEUE_MAX_NELTS];
  } frame_queue_nelt_counter_t;
  
  #endif /* included_vlib_node_h */
  
  /*
   * fd.io coding-style-patch-verification: ON
   *
   * Local Variables:
   * eval: (c-set-style "gnu")
   * End:
   */
  