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;
 }

 vlib_node_registration_t ip4_classify_node;
 vlib_node_registration_t ip6_classify_node;

 #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 (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 = (void *)vlib_buffer_get_current(b0) -
                 ethernet_buffer_header_size(b0);

       bi1 = from[1];
       b1 = vlib_get_buffer (vm, bi1);
       h1 = (void *)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, (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 cd_index0;
       classify_dpo_t *cd0;
       u32 table_index0;
       vnet_classify_table_t * t0;

       bi0 = from[0];
       b0 = vlib_get_buffer (vm, bi0);
       h0 = (void *)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, (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 = IP_LOOKUP_NEXT_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_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, (u8 *) 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, (u8 *) h0);
                       e0 = vnet_classify_find_entry
                         (t0, (u8 *) 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 - t0->entries : ~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;
 }

 static uword
 ip4_classify (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) = {
   .function = ip4_classify,
   .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_FUNCTION_MULTIARCH (ip4_classify_node, ip4_classify)

 static uword
 ip6_classify (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) = {
   .function = ip6_classify,
   .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,
 };

 VLIB_NODE_FUNCTION_MULTIARCH (ip6_classify_node, ip6_classify)

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

 VLIB_INIT_FUNCTION (ip_classify_init);
	/*
	* 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;
	}

	vlib_node_registration_t ip4_classify_node;
	vlib_node_registration_t ip6_classify_node;

	#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 (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 = (void *)vlib_buffer_get_current(b0) -
	ethernet_buffer_header_size(b0);

	bi1 = from[1];
	b1 = vlib_get_buffer (vm, bi1);
	h1 = (void *)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, (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 cd_index0;
	classify_dpo_t *cd0;
	u32 table_index0;
	vnet_classify_table_t * t0;

	bi0 = from[0];
	b0 = vlib_get_buffer (vm, bi0);
	h0 = (void *)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, (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 = IP_LOOKUP_NEXT_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_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, (u8 *) 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, (u8 *) h0);
	e0 = vnet_classify_find_entry
	(t0, (u8 *) 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 - t0->entries : ~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;
	}

	static uword
	ip4_classify (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) = {
	.function = ip4_classify,
	.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_FUNCTION_MULTIARCH (ip4_classify_node, ip4_classify)

	static uword
	ip6_classify (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) = {
	.function = ip6_classify,
	.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,
	};

	VLIB_NODE_FUNCTION_MULTIARCH (ip6_classify_node, ip6_classify)

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

	VLIB_INIT_FUNCTION (ip_classify_init);