src/vnet/classify/flow_classify_node.c - fdio/vpp - Gitiles

 /*
  * Copyright (c) 2016 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 <stdint.h>

 #include <vlib/vlib.h>
 #include <vnet/vnet.h>
 #include <vnet/ip/ip.h>
 #include <vnet/classify/flow_classify.h>
 #include <vnet/classify/vnet_classify.h>

 typedef struct
 {
   u32 sw_if_index;
   u32 next_index;
   u32 table_index;
   u32 offset;
 } flow_classify_trace_t;

 static u8 *
 format_flow_classify_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 *);
   flow_classify_trace_t *t = va_arg (*args, flow_classify_trace_t *);

   s = format (s, "FLOW_CLASSIFY: sw_if_index %d next %d table %d offset %d",
 	      t->sw_if_index, t->next_index, t->table_index, t->offset);
   return s;
 }

 #define foreach_flow_classify_error                 \
 _(MISS, "Flow classify misses")                     \
 _(HIT, "Flow classify hits")                        \
 _(CHAIN_HIT, "Flow classify hits after chain walk") \
 _(DROP, "Flow classify action drop")

 typedef enum
 {
 #define _(sym,str) FLOW_CLASSIFY_ERROR_##sym,
   foreach_flow_classify_error
 #undef _
     FLOW_CLASSIFY_N_ERROR,
 } flow_classify_error_t;

 static char *flow_classify_error_strings[] = {
 #define _(sym,string) string,
   foreach_flow_classify_error
 #undef _
 };

 static inline uword
 flow_classify_inline (vlib_main_t * vm,
 		      vlib_node_runtime_t * node,
 		      vlib_frame_t * frame, flow_classify_table_id_t tid)
 {
   u32 n_left_from, *from, *to_next;
   flow_classify_next_index_t next_index;
   flow_classify_main_t *fcm = &flow_classify_main;
   vnet_classify_main_t *vcm = fcm->vnet_classify_main;
   f64 now = vlib_time_now (vm);
   u32 hits = 0;
   u32 misses = 0;
   u32 chain_hits = 0;
   u32 drop = 0;

   from = vlib_frame_vector_args (frame);
   n_left_from = frame->n_vectors;

   /* First pass: compute hashes */
   while (n_left_from > 2)
     {
       vlib_buffer_t *b0, *b1;
       u32 bi0, bi1;
       u8 *h0, *h1;
       u32 sw_if_index0, sw_if_index1;
       u32 table_index0, table_index1;
       vnet_classify_table_t *t0, *t1;

       /* Prefetch next iteration */
       {
 	vlib_buffer_t *p1, *p2;

 	p1 = vlib_get_buffer (vm, from[1]);
 	p2 = vlib_get_buffer (vm, from[2]);

 	vlib_prefetch_buffer_header (p1, STORE);
 	CLIB_PREFETCH (p1->data, CLIB_CACHE_LINE_BYTES, STORE);
 	vlib_prefetch_buffer_header (p2, STORE);
 	CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
       }

       bi0 = from[0];
       b0 = vlib_get_buffer (vm, bi0);
       h0 = b0->data;

       bi1 = from[1];
       b1 = vlib_get_buffer (vm, bi1);
       h1 = b1->data;

       sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
       table_index0 =
 	fcm->classify_table_index_by_sw_if_index[tid][sw_if_index0];

       sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
       table_index1 =
 	fcm->classify_table_index_by_sw_if_index[tid][sw_if_index1];

       t0 = pool_elt_at_index (vcm->tables, table_index0);

       t1 = pool_elt_at_index (vcm->tables, table_index1);

       vnet_buffer (b0)->l2_classify.hash =
 	vnet_classify_hash_packet (t0, (u8 *) h0);

       vnet_classify_prefetch_bucket (t0, vnet_buffer (b0)->l2_classify.hash);

       vnet_buffer (b1)->l2_classify.hash =
 	vnet_classify_hash_packet (t1, (u8 *) h1);

       vnet_classify_prefetch_bucket (t1, vnet_buffer (b1)->l2_classify.hash);

       vnet_buffer (b0)->l2_classify.table_index = table_index0;

       vnet_buffer (b1)->l2_classify.table_index = table_index1;

       from += 2;
       n_left_from -= 2;
     }

   while (n_left_from > 0)
     {
       vlib_buffer_t *b0;
       u32 bi0;
       u8 *h0;
       u32 sw_if_index0;
       u32 table_index0;
       vnet_classify_table_t *t0;

       bi0 = from[0];
       b0 = vlib_get_buffer (vm, bi0);
       h0 = b0->data;

       sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
       table_index0 =
 	fcm->classify_table_index_by_sw_if_index[tid][sw_if_index0];

       t0 = pool_elt_at_index (vcm->tables, table_index0);
       vnet_buffer (b0)->l2_classify.hash =
 	vnet_classify_hash_packet (t0, (u8 *) h0);

       vnet_buffer (b0)->l2_classify.table_index = table_index0;
       vnet_classify_prefetch_bucket (t0, vnet_buffer (b0)->l2_classify.hash);

       from++;
       n_left_from--;
     }

   next_index = node->cached_next_index;
   from = vlib_frame_vector_args (frame);
   n_left_from = frame->n_vectors;

   while (n_left_from > 0)
     {
       u32 n_left_to_next;

       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

       /* Not enough load/store slots to dual loop... */
       while (n_left_from > 0 && n_left_to_next > 0)
 	{
 	  u32 bi0;
 	  vlib_buffer_t *b0;
 	  u32 next0 = FLOW_CLASSIFY_NEXT_INDEX_DROP;
 	  u32 table_index0;
 	  vnet_classify_table_t *t0;
 	  vnet_classify_entry_t *e0;
 	  u64 hash0;
 	  u8 *h0;

 	  /* Stride 3 seems to work best */
 	  if (PREDICT_TRUE (n_left_from > 3))
 	    {
 	      vlib_buffer_t *p1 = vlib_get_buffer (vm, from[3]);
 	      vnet_classify_table_t *tp1;
 	      u32 table_index1;
 	      u64 phash1;

 	      table_index1 = vnet_buffer (p1)->l2_classify.table_index;

 	      if (PREDICT_TRUE (table_index1 != ~0))
 		{
 		  tp1 = pool_elt_at_index (vcm->tables, table_index1);
 		  phash1 = vnet_buffer (p1)->l2_classify.hash;
 		  vnet_classify_prefetch_entry (tp1, phash1);
 		}
 	    }

 	  /* 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);
 	  h0 = b0->data;
 	  table_index0 = vnet_buffer (b0)->l2_classify.table_index;
 	  e0 = 0;
 	  t0 = 0;

 	  vnet_get_config_data (fcm->vnet_config_main[tid],
 				&b0->current_config_index, &next0,
 				/* # bytes of config data */ 0);

 	  if (PREDICT_TRUE (table_index0 != ~0))
 	    {
 	      hash0 = vnet_buffer (b0)->l2_classify.hash;
 	      t0 = pool_elt_at_index (vcm->tables, table_index0);
 	      e0 = vnet_classify_find_entry (t0, (u8 *) h0, hash0, now);
 	      if (e0)
 		{
 		  hits++;
 		}
 	      else
 		{
 		  misses++;
 		  vnet_classify_add_del_session (vcm, table_index0,
 						 h0, ~0, 0, 0, 0, 0, 1);
 		  /* increment counter */
 		  vnet_classify_find_entry (t0, (u8 *) h0, hash0, now);
 		}
 	    }
 	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
 			     && (b0->flags & VLIB_BUFFER_IS_TRACED)))
 	    {
 	      flow_classify_trace_t *t =
 		vlib_add_trace (vm, node, b0, sizeof (*t));
 	      t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
 	      t->next_index = next0;
 	      t->table_index = t0 ? t0 - vcm->tables : ~0;
 	      t->offset = (t0 && e0) ? vnet_classify_get_offset (t0, e0) : ~0;
 	    }

 	  /* 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);
     }

   vlib_node_increment_counter (vm, node->node_index,
 			       FLOW_CLASSIFY_ERROR_MISS, misses);
   vlib_node_increment_counter (vm, node->node_index,
 			       FLOW_CLASSIFY_ERROR_HIT, hits);
   vlib_node_increment_counter (vm, node->node_index,
 			       FLOW_CLASSIFY_ERROR_CHAIN_HIT, chain_hits);
   vlib_node_increment_counter (vm, node->node_index,
 			       FLOW_CLASSIFY_ERROR_DROP, drop);

   return frame->n_vectors;
 }

 VLIB_NODE_FN (ip4_flow_classify_node) (vlib_main_t * vm,
 				       vlib_node_runtime_t * node,
 				       vlib_frame_t * frame)
 {
   return flow_classify_inline (vm, node, frame, FLOW_CLASSIFY_TABLE_IP4);
 }

 /* *INDENT-OFF* */
 VLIB_REGISTER_NODE (ip4_flow_classify_node) = {
   .name = "ip4-flow-classify",
   .vector_size = sizeof (u32),
   .format_trace = format_flow_classify_trace,
   .n_errors = ARRAY_LEN(flow_classify_error_strings),
   .error_strings = flow_classify_error_strings,
   .n_next_nodes = FLOW_CLASSIFY_NEXT_INDEX_N_NEXT,
   .next_nodes = {
     [FLOW_CLASSIFY_NEXT_INDEX_DROP] = "error-drop",
   },
 };
 /* *INDENT-ON* */

 VLIB_NODE_FN (ip6_flow_classify_node) (vlib_main_t * vm,
 				       vlib_node_runtime_t * node,
 				       vlib_frame_t * frame)
 {
   return flow_classify_inline (vm, node, frame, FLOW_CLASSIFY_TABLE_IP6);
 }

 /* *INDENT-OFF* */
 VLIB_REGISTER_NODE (ip6_flow_classify_node) = {
   .name = "ip6-flow-classify",
   .vector_size = sizeof (u32),
   .format_trace = format_flow_classify_trace,
   .n_errors = ARRAY_LEN(flow_classify_error_strings),
   .error_strings = flow_classify_error_strings,
   .n_next_nodes = FLOW_CLASSIFY_NEXT_INDEX_N_NEXT,
   .next_nodes = {
     [FLOW_CLASSIFY_NEXT_INDEX_DROP] = "error-drop",
   },
 };

 /* *INDENT-ON* */


 static clib_error_t *
 flow_classify_init (vlib_main_t * vm)
 {
   flow_classify_main_t *fcm = &flow_classify_main;

   fcm->vlib_main = vm;
   fcm->vnet_main = vnet_get_main ();
   fcm->vnet_classify_main = &vnet_classify_main;

   return 0;
 }

 VLIB_INIT_FUNCTION (flow_classify_init);

 /*
  * fd.io coding-style-patch-verification: ON
  *
  * Local Variables:
  * eval: (c-set-style "gnu")
  * End:
  */
	/*
	* Copyright (c) 2016 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 <stdint.h>

	#include <vlib/vlib.h>
	#include <vnet/vnet.h>
	#include <vnet/ip/ip.h>
	#include <vnet/classify/flow_classify.h>
	#include <vnet/classify/vnet_classify.h>

	typedef struct
	{
	u32 sw_if_index;
	u32 next_index;
	u32 table_index;
	u32 offset;
	} flow_classify_trace_t;

	static u8 *
	format_flow_classify_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 );
	flow_classify_trace_t t = va_arg (args, flow_classify_trace_t *);

	s = format (s, "FLOW_CLASSIFY: sw_if_index %d next %d table %d offset %d",
	t->sw_if_index, t->next_index, t->table_index, t->offset);
	return s;
	}

	#define foreach_flow_classify_error \
	_(MISS, "Flow classify misses") \
	_(HIT, "Flow classify hits") \
	_(CHAIN_HIT, "Flow classify hits after chain walk") \
	_(DROP, "Flow classify action drop")

	typedef enum
	{
	#define _(sym,str) FLOW_CLASSIFY_ERROR_##sym,
	foreach_flow_classify_error
	#undef _
	FLOW_CLASSIFY_N_ERROR,
	} flow_classify_error_t;

	static char *flow_classify_error_strings[] = {
	#define _(sym,string) string,
	foreach_flow_classify_error
	#undef _
	};

	static inline uword
	flow_classify_inline (vlib_main_t * vm,
	vlib_node_runtime_t * node,
	vlib_frame_t * frame, flow_classify_table_id_t tid)
	{
	u32 n_left_from, from, to_next;
	flow_classify_next_index_t next_index;
	flow_classify_main_t *fcm = &flow_classify_main;
	vnet_classify_main_t *vcm = fcm->vnet_classify_main;
	f64 now = vlib_time_now (vm);
	u32 hits = 0;
	u32 misses = 0;
	u32 chain_hits = 0;
	u32 drop = 0;

	from = vlib_frame_vector_args (frame);
	n_left_from = frame->n_vectors;

	/* First pass: compute hashes */
	while (n_left_from > 2)
	{
	vlib_buffer_t b0, b1;
	u32 bi0, bi1;
	u8 h0, h1;
	u32 sw_if_index0, sw_if_index1;
	u32 table_index0, table_index1;
	vnet_classify_table_t t0, t1;

	/* Prefetch next iteration */
	{
	vlib_buffer_t p1, p2;

	p1 = vlib_get_buffer (vm, from[1]);
	p2 = vlib_get_buffer (vm, from[2]);

	vlib_prefetch_buffer_header (p1, STORE);
	CLIB_PREFETCH (p1->data, CLIB_CACHE_LINE_BYTES, STORE);
	vlib_prefetch_buffer_header (p2, STORE);
	CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
	}

	bi0 = from[0];
	b0 = vlib_get_buffer (vm, bi0);
	h0 = b0->data;

	bi1 = from[1];
	b1 = vlib_get_buffer (vm, bi1);
	h1 = b1->data;

	sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
	table_index0 =
	fcm->classify_table_index_by_sw_if_index[tid][sw_if_index0];

	sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
	table_index1 =
	fcm->classify_table_index_by_sw_if_index[tid][sw_if_index1];

	t0 = pool_elt_at_index (vcm->tables, table_index0);

	t1 = pool_elt_at_index (vcm->tables, table_index1);

	vnet_buffer (b0)->l2_classify.hash =
	vnet_classify_hash_packet (t0, (u8 *) h0);

	vnet_classify_prefetch_bucket (t0, vnet_buffer (b0)->l2_classify.hash);

	vnet_buffer (b1)->l2_classify.hash =
	vnet_classify_hash_packet (t1, (u8 *) h1);

	vnet_classify_prefetch_bucket (t1, vnet_buffer (b1)->l2_classify.hash);

	vnet_buffer (b0)->l2_classify.table_index = table_index0;

	vnet_buffer (b1)->l2_classify.table_index = table_index1;

	from += 2;
	n_left_from -= 2;
	}

	while (n_left_from > 0)
	{
	vlib_buffer_t *b0;
	u32 bi0;
	u8 *h0;
	u32 sw_if_index0;
	u32 table_index0;
	vnet_classify_table_t *t0;

	bi0 = from[0];
	b0 = vlib_get_buffer (vm, bi0);
	h0 = b0->data;

	sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
	table_index0 =
	fcm->classify_table_index_by_sw_if_index[tid][sw_if_index0];

	t0 = pool_elt_at_index (vcm->tables, table_index0);
	vnet_buffer (b0)->l2_classify.hash =
	vnet_classify_hash_packet (t0, (u8 *) h0);

	vnet_buffer (b0)->l2_classify.table_index = table_index0;
	vnet_classify_prefetch_bucket (t0, vnet_buffer (b0)->l2_classify.hash);

	from++;
	n_left_from--;
	}

	next_index = node->cached_next_index;
	from = vlib_frame_vector_args (frame);
	n_left_from = frame->n_vectors;

	while (n_left_from > 0)
	{
	u32 n_left_to_next;

	vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

	/* Not enough load/store slots to dual loop... */
	while (n_left_from > 0 && n_left_to_next > 0)
	{
	u32 bi0;
	vlib_buffer_t *b0;
	u32 next0 = FLOW_CLASSIFY_NEXT_INDEX_DROP;
	u32 table_index0;
	vnet_classify_table_t *t0;
	vnet_classify_entry_t *e0;
	u64 hash0;
	u8 *h0;

	/* Stride 3 seems to work best */
	if (PREDICT_TRUE (n_left_from > 3))
	{
	vlib_buffer_t *p1 = vlib_get_buffer (vm, from[3]);
	vnet_classify_table_t *tp1;
	u32 table_index1;
	u64 phash1;

	table_index1 = vnet_buffer (p1)->l2_classify.table_index;

	if (PREDICT_TRUE (table_index1 != ~0))
	{
	tp1 = pool_elt_at_index (vcm->tables, table_index1);
	phash1 = vnet_buffer (p1)->l2_classify.hash;
	vnet_classify_prefetch_entry (tp1, phash1);
	}
	}

	/* 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);
	h0 = b0->data;
	table_index0 = vnet_buffer (b0)->l2_classify.table_index;
	e0 = 0;
	t0 = 0;

	vnet_get_config_data (fcm->vnet_config_main[tid],
	&b0->current_config_index, &next0,
	/* # bytes of config data */ 0);

	if (PREDICT_TRUE (table_index0 != ~0))
	{
	hash0 = vnet_buffer (b0)->l2_classify.hash;
	t0 = pool_elt_at_index (vcm->tables, table_index0);
	e0 = vnet_classify_find_entry (t0, (u8 *) h0, hash0, now);
	if (e0)
	{
	hits++;
	}
	else
	{
	misses++;
	vnet_classify_add_del_session (vcm, table_index0,
	h0, ~0, 0, 0, 0, 0, 1);
	/* increment counter */
	vnet_classify_find_entry (t0, (u8 *) h0, hash0, now);
	}
	}
	if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
	&& (b0->flags & VLIB_BUFFER_IS_TRACED)))
	{
	flow_classify_trace_t *t =
	vlib_add_trace (vm, node, b0, sizeof (*t));
	t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
	t->next_index = next0;
	t->table_index = t0 ? t0 - vcm->tables : ~0;
	t->offset = (t0 && e0) ? vnet_classify_get_offset (t0, e0) : ~0;
	}

	/* 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);
	}

	vlib_node_increment_counter (vm, node->node_index,
	FLOW_CLASSIFY_ERROR_MISS, misses);
	vlib_node_increment_counter (vm, node->node_index,
	FLOW_CLASSIFY_ERROR_HIT, hits);
	vlib_node_increment_counter (vm, node->node_index,
	FLOW_CLASSIFY_ERROR_CHAIN_HIT, chain_hits);
	vlib_node_increment_counter (vm, node->node_index,
	FLOW_CLASSIFY_ERROR_DROP, drop);

	return frame->n_vectors;
	}

	VLIB_NODE_FN (ip4_flow_classify_node) (vlib_main_t * vm,
	vlib_node_runtime_t * node,
	vlib_frame_t * frame)
	{
	return flow_classify_inline (vm, node, frame, FLOW_CLASSIFY_TABLE_IP4);
	}

	/* INDENT-OFF */
	VLIB_REGISTER_NODE (ip4_flow_classify_node) = {
	.name = "ip4-flow-classify",
	.vector_size = sizeof (u32),
	.format_trace = format_flow_classify_trace,
	.n_errors = ARRAY_LEN(flow_classify_error_strings),
	.error_strings = flow_classify_error_strings,
	.n_next_nodes = FLOW_CLASSIFY_NEXT_INDEX_N_NEXT,
	.next_nodes = {
	[FLOW_CLASSIFY_NEXT_INDEX_DROP] = "error-drop",
	},
	};
	/* INDENT-ON */

	VLIB_NODE_FN (ip6_flow_classify_node) (vlib_main_t * vm,
	vlib_node_runtime_t * node,
	vlib_frame_t * frame)
	{
	return flow_classify_inline (vm, node, frame, FLOW_CLASSIFY_TABLE_IP6);
	}

	/* INDENT-OFF */
	VLIB_REGISTER_NODE (ip6_flow_classify_node) = {
	.name = "ip6-flow-classify",
	.vector_size = sizeof (u32),
	.format_trace = format_flow_classify_trace,
	.n_errors = ARRAY_LEN(flow_classify_error_strings),
	.error_strings = flow_classify_error_strings,
	.n_next_nodes = FLOW_CLASSIFY_NEXT_INDEX_N_NEXT,
	.next_nodes = {
	[FLOW_CLASSIFY_NEXT_INDEX_DROP] = "error-drop",
	},
	};

	/* INDENT-ON */


	static clib_error_t *
	flow_classify_init (vlib_main_t * vm)
	{
	flow_classify_main_t *fcm = &flow_classify_main;

	fcm->vlib_main = vm;
	fcm->vnet_main = vnet_get_main ();
	fcm->vnet_classify_main = &vnet_classify_main;

	return 0;
	}

	VLIB_INIT_FUNCTION (flow_classify_init);

	/*
	* fd.io coding-style-patch-verification: ON
	*
	* Local Variables:
	* eval: (c-set-style "gnu")
	* End:
	*/