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

 /*
  * 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.
  */
 #include <vnet/ip/ip.h>
 #include <vnet/ethernet/ethernet.h>	/* for ethernet_header_t */
 #include <vnet/classify/vnet_classify.h>
 #include <vnet/dpo/classify_dpo.h>

 typedef struct
 {
   u32 next_index;
   u32 table_index;
   u32 entry_index;
 } ip_classify_trace_t;

 /* packet trace format function */
 static u8 *
 format_ip_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 *);
   ip_classify_trace_t *t = va_arg (*args, ip_classify_trace_t *);

   s = format (s, "IP_CLASSIFY: next_index %d, table %d, entry %d",
 	      t->next_index, t->table_index, t->entry_index);
   return s;
 }

 #define foreach_ip_classify_error               \
 _(MISS, "Classify misses")                      \
 _(HIT, "Classify hits")                         \
 _(CHAIN_HIT, "Classify hits after chain walk")

 typedef enum
 {
 #define _(sym,str) IP_CLASSIFY_ERROR_##sym,
   foreach_ip_classify_error
 #undef _
     IP_CLASSIFY_N_ERROR,
 } ip_classify_error_t;

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

 static inline uword
 ip_classify_inline (vlib_main_t * vm,
 		    vlib_node_runtime_t * node,
 		    vlib_frame_t * frame, int is_ip4)
 {
   u32 n_left_from, *from, *to_next;
   ip_lookup_next_t next_index;
   vnet_classify_main_t *vcm = &vnet_classify_main;
   f64 now = vlib_time_now (vm);
   u32 hits = 0;
   u32 misses = 0;
   u32 chain_hits = 0;
   u32 n_next;

   if (is_ip4)
     {
       n_next = IP4_LOOKUP_N_NEXT;
     }
   else
     {
       n_next = IP6_LOOKUP_N_NEXT;
     }

   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 cd_index0, cd_index1;
       classify_dpo_t *cd0, *cd1;
       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_store (p1->data);
 	vlib_prefetch_buffer_header (p2, STORE);
 	clib_prefetch_store (p2->data);
       }

       bi0 = from[0];
       b0 = vlib_get_buffer (vm, bi0);
       h0 = vlib_buffer_get_current (b0) - ethernet_buffer_header_size (b0);

       bi1 = from[1];
       b1 = vlib_get_buffer (vm, bi1);
       h1 = vlib_buffer_get_current (b1) - ethernet_buffer_header_size (b1);

       cd_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
       cd0 = classify_dpo_get (cd_index0);
       table_index0 = cd0->cd_table_index;

       cd_index1 = vnet_buffer (b1)->ip.adj_index[VLIB_TX];
       cd1 = classify_dpo_get (cd_index1);
       table_index1 = cd1->cd_table_index;

       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, h0);

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

       vnet_buffer (b1)->l2_classify.hash = vnet_classify_hash_packet (t1, 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 cd_index0;
       classify_dpo_t *cd0;
       u32 table_index0;
       vnet_classify_table_t *t0;

       bi0 = from[0];
       b0 = vlib_get_buffer (vm, bi0);
       h0 = vlib_buffer_get_current (b0) - ethernet_buffer_header_size (b0);

       cd_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
       cd0 = classify_dpo_get (cd_index0);
       table_index0 = cd0->cd_table_index;

       t0 = pool_elt_at_index (vcm->tables, table_index0);
       vnet_buffer (b0)->l2_classify.hash = vnet_classify_hash_packet (t0, 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 = IP_LOOKUP_NEXT_DROP;
 	  u32 table_index0;
 	  vnet_classify_table_t *t0;
 	  vnet_classify_entry_t *e0;
 	  u32 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;
 	      u32 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_buffer (b0)->l2_classify.opaque_index = ~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, h0, hash0, now);
 	      if (e0)
 		{
 		  vnet_buffer (b0)->l2_classify.opaque_index
 		    = e0->opaque_index;
 		  vlib_buffer_advance (b0, e0->advance);
 		  next0 = (e0->next_index < node->n_next_nodes) ?
 		    e0->next_index : next0;
 		  hits++;
 		}
 	      else
 		{
 		  while (1)
 		    {
 		      if (t0->next_table_index != ~0)
 			t0 = pool_elt_at_index (vcm->tables,
 						t0->next_table_index);
 		      else
 			{
 			  next0 = (t0->miss_next_index < n_next) ?
 			    t0->miss_next_index : next0;
 			  misses++;
 			  break;
 			}

 		      hash0 = vnet_classify_hash_packet (t0, h0);
 		      e0 = vnet_classify_find_entry (t0, h0, hash0, now);
 		      if (e0)
 			{
 			  vnet_buffer (b0)->l2_classify.opaque_index
 			    = e0->opaque_index;
 			  vlib_buffer_advance (b0, e0->advance);
 			  next0 = (e0->next_index < node->n_next_nodes) ?
 			    e0->next_index : next0;
 			  hits++;
 			  chain_hits++;
 			  break;
 			}
 		    }
 		}
 	    }

 	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
 			     && (b0->flags & VLIB_BUFFER_IS_TRACED)))
 	    {
 	      ip_classify_trace_t *t =
 		vlib_add_trace (vm, node, b0, sizeof (*t));
 	      t->next_index = next0;
 	      t->table_index = t0 ? t0 - vcm->tables : ~0;
 	      t->entry_index = e0 ? e0->opaque_index : ~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,
 			       IP_CLASSIFY_ERROR_MISS, misses);
   vlib_node_increment_counter (vm, node->node_index,
 			       IP_CLASSIFY_ERROR_HIT, hits);
   vlib_node_increment_counter (vm, node->node_index,
 			       IP_CLASSIFY_ERROR_CHAIN_HIT, chain_hits);
   return frame->n_vectors;
 }

 VLIB_NODE_FN (ip4_classify_node) (vlib_main_t * vm,
 				  vlib_node_runtime_t * node,
 				  vlib_frame_t * frame)
 {
   return ip_classify_inline (vm, node, frame, 1 /* is_ip4 */ );
 }


 VLIB_REGISTER_NODE (ip4_classify_node) = {
   .name = "ip4-classify",
   .vector_size = sizeof (u32),
   .sibling_of = "ip4-lookup",
   .format_trace = format_ip_classify_trace,
   .n_errors = ARRAY_LEN(ip_classify_error_strings),
   .error_strings = ip_classify_error_strings,

   .n_next_nodes = 0,
 };

 VLIB_NODE_FN (ip6_classify_node) (vlib_main_t * vm,
 				  vlib_node_runtime_t * node,
 				  vlib_frame_t * frame)
 {
   return ip_classify_inline (vm, node, frame, 0 /* is_ip4 */ );
 }


 VLIB_REGISTER_NODE (ip6_classify_node) = {
   .name = "ip6-classify",
   .vector_size = sizeof (u32),
   .sibling_of = "ip6-lookup",
   .format_trace = format_ip_classify_trace,
   .n_errors = ARRAY_LEN(ip_classify_error_strings),
   .error_strings = ip_classify_error_strings,

   .n_next_nodes = 0,
 };

 #ifndef CLIB_MARCH_VARIANT
 static clib_error_t *
 ip_classify_init (vlib_main_t * vm)
 {
   return 0;
 }

 VLIB_INIT_FUNCTION (ip_classify_init);
 #endif /* CLIB_MARCH_VARIANT */

 /*
  * fd.io coding-style-patch-verification: ON
  *
  * Local Variables:
  * eval: (c-set-style "gnu")
  * End:
  */
	/*
	* 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.
	*/
	#include <vnet/ip/ip.h>
	#include <vnet/ethernet/ethernet.h> /* for ethernet_header_t */
	#include <vnet/classify/vnet_classify.h>
	#include <vnet/dpo/classify_dpo.h>

	typedef struct
	{
	u32 next_index;
	u32 table_index;
	u32 entry_index;
	} ip_classify_trace_t;

	/* packet trace format function */
	static u8 *
	format_ip_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 );
	ip_classify_trace_t t = va_arg (args, ip_classify_trace_t *);

	s = format (s, "IP_CLASSIFY: next_index %d, table %d, entry %d",
	t->next_index, t->table_index, t->entry_index);
	return s;
	}

	#define foreach_ip_classify_error \
	_(MISS, "Classify misses") \
	_(HIT, "Classify hits") \
	_(CHAIN_HIT, "Classify hits after chain walk")

	typedef enum
	{
	#define _(sym,str) IP_CLASSIFY_ERROR_##sym,
	foreach_ip_classify_error
	#undef _
	IP_CLASSIFY_N_ERROR,
	} ip_classify_error_t;

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

	static inline uword
	ip_classify_inline (vlib_main_t * vm,
	vlib_node_runtime_t * node,
	vlib_frame_t * frame, int is_ip4)
	{
	u32 n_left_from, from, to_next;
	ip_lookup_next_t next_index;
	vnet_classify_main_t *vcm = &vnet_classify_main;
	f64 now = vlib_time_now (vm);
	u32 hits = 0;
	u32 misses = 0;
	u32 chain_hits = 0;
	u32 n_next;

	if (is_ip4)
	{
	n_next = IP4_LOOKUP_N_NEXT;
	}
	else
	{
	n_next = IP6_LOOKUP_N_NEXT;
	}

	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 cd_index0, cd_index1;
	classify_dpo_t cd0, cd1;
	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_store (p1->data);
	vlib_prefetch_buffer_header (p2, STORE);
	clib_prefetch_store (p2->data);
	}

	bi0 = from[0];
	b0 = vlib_get_buffer (vm, bi0);
	h0 = vlib_buffer_get_current (b0) - ethernet_buffer_header_size (b0);

	bi1 = from[1];
	b1 = vlib_get_buffer (vm, bi1);
	h1 = vlib_buffer_get_current (b1) - ethernet_buffer_header_size (b1);

	cd_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
	cd0 = classify_dpo_get (cd_index0);
	table_index0 = cd0->cd_table_index;

	cd_index1 = vnet_buffer (b1)->ip.adj_index[VLIB_TX];
	cd1 = classify_dpo_get (cd_index1);
	table_index1 = cd1->cd_table_index;

	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, h0);

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

	vnet_buffer (b1)->l2_classify.hash = vnet_classify_hash_packet (t1, 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 cd_index0;
	classify_dpo_t *cd0;
	u32 table_index0;
	vnet_classify_table_t *t0;

	bi0 = from[0];
	b0 = vlib_get_buffer (vm, bi0);
	h0 = vlib_buffer_get_current (b0) - ethernet_buffer_header_size (b0);

	cd_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
	cd0 = classify_dpo_get (cd_index0);
	table_index0 = cd0->cd_table_index;

	t0 = pool_elt_at_index (vcm->tables, table_index0);
	vnet_buffer (b0)->l2_classify.hash = vnet_classify_hash_packet (t0, 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 = IP_LOOKUP_NEXT_DROP;
	u32 table_index0;
	vnet_classify_table_t *t0;
	vnet_classify_entry_t *e0;
	u32 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;
	u32 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_buffer (b0)->l2_classify.opaque_index = ~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, h0, hash0, now);
	if (e0)
	{
	vnet_buffer (b0)->l2_classify.opaque_index
	= e0->opaque_index;
	vlib_buffer_advance (b0, e0->advance);
	next0 = (e0->next_index < node->n_next_nodes) ?
	e0->next_index : next0;
	hits++;
	}
	else
	{
	while (1)
	{
	if (t0->next_table_index != ~0)
	t0 = pool_elt_at_index (vcm->tables,
	t0->next_table_index);
	else
	{
	next0 = (t0->miss_next_index < n_next) ?
	t0->miss_next_index : next0;
	misses++;
	break;
	}

	hash0 = vnet_classify_hash_packet (t0, h0);
	e0 = vnet_classify_find_entry (t0, h0, hash0, now);
	if (e0)
	{
	vnet_buffer (b0)->l2_classify.opaque_index
	= e0->opaque_index;
	vlib_buffer_advance (b0, e0->advance);
	next0 = (e0->next_index < node->n_next_nodes) ?
	e0->next_index : next0;
	hits++;
	chain_hits++;
	break;
	}
	}
	}
	}

	if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
	&& (b0->flags & VLIB_BUFFER_IS_TRACED)))
	{
	ip_classify_trace_t *t =
	vlib_add_trace (vm, node, b0, sizeof (*t));
	t->next_index = next0;
	t->table_index = t0 ? t0 - vcm->tables : ~0;
	t->entry_index = e0 ? e0->opaque_index : ~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,
	IP_CLASSIFY_ERROR_MISS, misses);
	vlib_node_increment_counter (vm, node->node_index,
	IP_CLASSIFY_ERROR_HIT, hits);
	vlib_node_increment_counter (vm, node->node_index,
	IP_CLASSIFY_ERROR_CHAIN_HIT, chain_hits);
	return frame->n_vectors;
	}

	VLIB_NODE_FN (ip4_classify_node) (vlib_main_t * vm,
	vlib_node_runtime_t * node,
	vlib_frame_t * frame)
	{
	return ip_classify_inline (vm, node, frame, 1 /* is_ip4 */ );
	}


	VLIB_REGISTER_NODE (ip4_classify_node) = {
	.name = "ip4-classify",
	.vector_size = sizeof (u32),
	.sibling_of = "ip4-lookup",
	.format_trace = format_ip_classify_trace,
	.n_errors = ARRAY_LEN(ip_classify_error_strings),
	.error_strings = ip_classify_error_strings,

	.n_next_nodes = 0,
	};

	VLIB_NODE_FN (ip6_classify_node) (vlib_main_t * vm,
	vlib_node_runtime_t * node,
	vlib_frame_t * frame)
	{
	return ip_classify_inline (vm, node, frame, 0 /* is_ip4 */ );
	}


	VLIB_REGISTER_NODE (ip6_classify_node) = {
	.name = "ip6-classify",
	.vector_size = sizeof (u32),
	.sibling_of = "ip6-lookup",
	.format_trace = format_ip_classify_trace,
	.n_errors = ARRAY_LEN(ip_classify_error_strings),
	.error_strings = ip_classify_error_strings,

	.n_next_nodes = 0,
	};

	#ifndef CLIB_MARCH_VARIANT
	static clib_error_t *
	ip_classify_init (vlib_main_t * vm)
	{
	return 0;
	}

	VLIB_INIT_FUNCTION (ip_classify_init);
	#endif /* CLIB_MARCH_VARIANT */

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