src/examples/sample-plugin/sample/node.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 <vlib/vlib.h>
 #include <vnet/vnet.h>
 #include <vnet/pg/pg.h>
 #include <vppinfra/error.h>
 #include <sample/sample.h>

 typedef struct {
   u32 next_index;
   u32 sw_if_index;
   u8 new_src_mac[6];
   u8 new_dst_mac[6];
 } sample_trace_t;

 static u8 *
 format_mac_address (u8 * s, va_list * args)
 {
   u8 *a = va_arg (*args, u8 *);
   return format (s, "%02x:%02x:%02x:%02x:%02x:%02x",
 		 a[0], a[1], a[2], a[3], a[4], a[5]);
 }

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

   s = format (s, "SAMPLE: sw_if_index %d, next index %d\n",
               t->sw_if_index, t->next_index);
   s = format (s, "  new src %U -> new dst %U",
               format_mac_address, t->new_src_mac,
               format_mac_address, t->new_dst_mac);

   return s;
 }

 vlib_node_registration_t sample_node;

 #define foreach_sample_error \
 _(SWAPPED, "Mac swap packets processed")

 typedef enum {
 #define _(sym,str) SAMPLE_ERROR_##sym,
   foreach_sample_error
 #undef _
   SAMPLE_N_ERROR,
 } sample_error_t;

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

 typedef enum {
   SAMPLE_NEXT_INTERFACE_OUTPUT,
   SAMPLE_N_NEXT,
 } sample_next_t;

 #define foreach_mac_address_offset              \
 _(0)                                            \
 _(1)                                            \
 _(2)                                            \
 _(3)                                            \
 _(4)                                            \
 _(5)

 static uword
 sample_node_fn (vlib_main_t * vm,
 		  vlib_node_runtime_t * node,
 		  vlib_frame_t * frame)
 {
   u32 n_left_from, * from, * to_next;
   sample_next_t next_index;
   u32 pkts_swapped = 0;

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

   while (n_left_from > 0)
     {
       u32 n_left_to_next;

       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 next0 = SAMPLE_NEXT_INTERFACE_OUTPUT;
           u32 next1 = SAMPLE_NEXT_INTERFACE_OUTPUT;
           u32 sw_if_index0, sw_if_index1;
           u8 tmp0[6], tmp1[6];
           ethernet_header_t *en0, *en1;
           u32 bi0, bi1;
 	  vlib_buffer_t * b0, * b1;

 	  /* Prefetch next iteration. */
 	  {
 	    vlib_buffer_t * p2, * p3;

 	    p2 = vlib_get_buffer (vm, from[2]);
 	    p3 = vlib_get_buffer (vm, from[3]);

 	    vlib_prefetch_buffer_header (p2, LOAD);
 	    vlib_prefetch_buffer_header (p3, LOAD);

 	    CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
 	    CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
 	  }

           /* speculatively enqueue b0 and b1 to the current next frame */
 	  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);

           ASSERT (b0->current_data == 0);
           ASSERT (b1->current_data == 0);

           en0 = vlib_buffer_get_current (b0);
           en1 = vlib_buffer_get_current (b1);

           /* This is not the fastest way to swap src + dst mac addresses */
 #define _(a) tmp0[a] = en0->src_address[a];
           foreach_mac_address_offset;
 #undef _
 #define _(a) en0->src_address[a] = en0->dst_address[a];
           foreach_mac_address_offset;
 #undef _
 #define _(a) en0->dst_address[a] = tmp0[a];
           foreach_mac_address_offset;
 #undef _

 #define _(a) tmp1[a] = en1->src_address[a];
           foreach_mac_address_offset;
 #undef _
 #define _(a) en1->src_address[a] = en1->dst_address[a];
           foreach_mac_address_offset;
 #undef _
 #define _(a) en1->dst_address[a] = tmp1[a];
           foreach_mac_address_offset;
 #undef _


           sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
           sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_RX];

           /* Send pkt back out the RX interface */
           vnet_buffer(b0)->sw_if_index[VLIB_TX] = sw_if_index0;
           vnet_buffer(b1)->sw_if_index[VLIB_TX] = sw_if_index1;

           pkts_swapped += 2;

           if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)))
             {
               if (b0->flags & VLIB_BUFFER_IS_TRACED)
                 {
                     sample_trace_t *t =
                       vlib_add_trace (vm, node, b0, sizeof (*t));
                     t->sw_if_index = sw_if_index0;
                     t->next_index = next0;
                     clib_memcpy (t->new_src_mac, en0->src_address,
                                  sizeof (t->new_src_mac));
                     clib_memcpy (t->new_dst_mac, en0->dst_address,
                                  sizeof (t->new_dst_mac));

                   }
                 if (b1->flags & VLIB_BUFFER_IS_TRACED)
                   {
                     sample_trace_t *t =
                       vlib_add_trace (vm, node, b1, sizeof (*t));
                     t->sw_if_index = sw_if_index1;
                     t->next_index = next1;
                     clib_memcpy (t->new_src_mac, en1->src_address,
                                  sizeof (t->new_src_mac));
                     clib_memcpy (t->new_dst_mac, en1->dst_address,
                                  sizeof (t->new_dst_mac));
                   }
               }

             /* verify speculative enqueues, maybe switch current next frame */
             vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
                                              to_next, n_left_to_next,
                                              bi0, bi1, next0, next1);
         }

       while (n_left_from > 0 && n_left_to_next > 0)
 	{
           u32 bi0;
 	  vlib_buffer_t * b0;
           u32 next0 = SAMPLE_NEXT_INTERFACE_OUTPUT;
           u32 sw_if_index0;
           u8 tmp0[6];
           ethernet_header_t *en0;

           /* 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);
           /*
            * Direct from the driver, we should be at offset 0
            * aka at &b0->data[0]
            */
           ASSERT (b0->current_data == 0);

           en0 = vlib_buffer_get_current (b0);

           /* This is not the fastest way to swap src + dst mac addresses */
 #define _(a) tmp0[a] = en0->src_address[a];
           foreach_mac_address_offset;
 #undef _
 #define _(a) en0->src_address[a] = en0->dst_address[a];
           foreach_mac_address_offset;
 #undef _
 #define _(a) en0->dst_address[a] = tmp0[a];
           foreach_mac_address_offset;
 #undef _

           sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];

           /* Send pkt back out the RX interface */
           vnet_buffer(b0)->sw_if_index[VLIB_TX] = sw_if_index0;

           if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
                             && (b0->flags & VLIB_BUFFER_IS_TRACED))) {
             sample_trace_t *t =
                vlib_add_trace (vm, node, b0, sizeof (*t));
             t->sw_if_index = sw_if_index0;
             t->next_index = next0;
             clib_memcpy (t->new_src_mac, en0->src_address,
                          sizeof (t->new_src_mac));
             clib_memcpy (t->new_dst_mac, en0->dst_address,
                          sizeof (t->new_dst_mac));
             }

           pkts_swapped += 1;

           /* 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, sample_node.index,
                                SAMPLE_ERROR_SWAPPED, pkts_swapped);
   return frame->n_vectors;
 }

 VLIB_REGISTER_NODE (sample_node) = {
   .function = sample_node_fn,
   .name = "sample",
   .vector_size = sizeof (u32),
   .format_trace = format_sample_trace,
   .type = VLIB_NODE_TYPE_INTERNAL,

   .n_errors = ARRAY_LEN(sample_error_strings),
   .error_strings = sample_error_strings,

   .n_next_nodes = SAMPLE_N_NEXT,

   /* edit / add dispositions here */
   .next_nodes = {
         [SAMPLE_NEXT_INTERFACE_OUTPUT] = "interface-output",
   },
 };
	/*
	* 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 <vlib/vlib.h>
	#include <vnet/vnet.h>
	#include <vnet/pg/pg.h>
	#include <vppinfra/error.h>
	#include <sample/sample.h>

	typedef struct {
	u32 next_index;
	u32 sw_if_index;
	u8 new_src_mac[6];
	u8 new_dst_mac[6];
	} sample_trace_t;

	static u8 *
	format_mac_address (u8 * s, va_list * args)
	{
	u8 a = va_arg (args, u8 *);
	return format (s, "%02x:%02x:%02x:%02x:%02x:%02x",
	a[0], a[1], a[2], a[3], a[4], a[5]);
	}

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

	s = format (s, "SAMPLE: sw_if_index %d, next index %d\n",
	t->sw_if_index, t->next_index);
	s = format (s, " new src %U -> new dst %U",
	format_mac_address, t->new_src_mac,
	format_mac_address, t->new_dst_mac);

	return s;
	}

	vlib_node_registration_t sample_node;

	#define foreach_sample_error \
	_(SWAPPED, "Mac swap packets processed")

	typedef enum {
	#define _(sym,str) SAMPLE_ERROR_##sym,
	foreach_sample_error
	#undef _
	SAMPLE_N_ERROR,
	} sample_error_t;

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

	typedef enum {
	SAMPLE_NEXT_INTERFACE_OUTPUT,
	SAMPLE_N_NEXT,
	} sample_next_t;

	#define foreach_mac_address_offset \
	_(0) \
	_(1) \
	_(2) \
	_(3) \
	_(4) \
	_(5)

	static uword
	sample_node_fn (vlib_main_t * vm,
	vlib_node_runtime_t * node,
	vlib_frame_t * frame)
	{
	u32 n_left_from, * from, * to_next;
	sample_next_t next_index;
	u32 pkts_swapped = 0;

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

	while (n_left_from > 0)
	{
	u32 n_left_to_next;

	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 next0 = SAMPLE_NEXT_INTERFACE_OUTPUT;
	u32 next1 = SAMPLE_NEXT_INTERFACE_OUTPUT;
	u32 sw_if_index0, sw_if_index1;
	u8 tmp0[6], tmp1[6];
	ethernet_header_t en0, en1;
	u32 bi0, bi1;
	vlib_buffer_t * b0, * b1;

	/* Prefetch next iteration. */
	{
	vlib_buffer_t * p2, * p3;

	p2 = vlib_get_buffer (vm, from[2]);
	p3 = vlib_get_buffer (vm, from[3]);

	vlib_prefetch_buffer_header (p2, LOAD);
	vlib_prefetch_buffer_header (p3, LOAD);

	CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
	CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
	}

	/* speculatively enqueue b0 and b1 to the current next frame */
	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);

	ASSERT (b0->current_data == 0);
	ASSERT (b1->current_data == 0);

	en0 = vlib_buffer_get_current (b0);
	en1 = vlib_buffer_get_current (b1);

	/* This is not the fastest way to swap src + dst mac addresses */
	#define _(a) tmp0[a] = en0->src_address[a];
	foreach_mac_address_offset;
	#undef _
	#define _(a) en0->src_address[a] = en0->dst_address[a];
	foreach_mac_address_offset;
	#undef _
	#define _(a) en0->dst_address[a] = tmp0[a];
	foreach_mac_address_offset;
	#undef _

	#define _(a) tmp1[a] = en1->src_address[a];
	foreach_mac_address_offset;
	#undef _
	#define _(a) en1->src_address[a] = en1->dst_address[a];
	foreach_mac_address_offset;
	#undef _
	#define _(a) en1->dst_address[a] = tmp1[a];
	foreach_mac_address_offset;
	#undef _



	sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
	sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_RX];

	/* Send pkt back out the RX interface */
	vnet_buffer(b0)->sw_if_index[VLIB_TX] = sw_if_index0;
	vnet_buffer(b1)->sw_if_index[VLIB_TX] = sw_if_index1;

	pkts_swapped += 2;

	if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)))
	{
	if (b0->flags & VLIB_BUFFER_IS_TRACED)
	{
	sample_trace_t *t =
	vlib_add_trace (vm, node, b0, sizeof (*t));
	t->sw_if_index = sw_if_index0;
	t->next_index = next0;
	clib_memcpy (t->new_src_mac, en0->src_address,
	sizeof (t->new_src_mac));
	clib_memcpy (t->new_dst_mac, en0->dst_address,
	sizeof (t->new_dst_mac));

	}
	if (b1->flags & VLIB_BUFFER_IS_TRACED)
	{
	sample_trace_t *t =
	vlib_add_trace (vm, node, b1, sizeof (*t));
	t->sw_if_index = sw_if_index1;
	t->next_index = next1;
	clib_memcpy (t->new_src_mac, en1->src_address,
	sizeof (t->new_src_mac));
	clib_memcpy (t->new_dst_mac, en1->dst_address,
	sizeof (t->new_dst_mac));
	}
	}

	/* verify speculative enqueues, maybe switch current next frame */
	vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
	to_next, n_left_to_next,
	bi0, bi1, next0, next1);
	}

	while (n_left_from > 0 && n_left_to_next > 0)
	{
	u32 bi0;
	vlib_buffer_t * b0;
	u32 next0 = SAMPLE_NEXT_INTERFACE_OUTPUT;
	u32 sw_if_index0;
	u8 tmp0[6];
	ethernet_header_t *en0;

	/* 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);
	/*
	* Direct from the driver, we should be at offset 0
	* aka at &b0->data[0]
	*/
	ASSERT (b0->current_data == 0);

	en0 = vlib_buffer_get_current (b0);

	/* This is not the fastest way to swap src + dst mac addresses */
	#define _(a) tmp0[a] = en0->src_address[a];
	foreach_mac_address_offset;
	#undef _
	#define _(a) en0->src_address[a] = en0->dst_address[a];
	foreach_mac_address_offset;
	#undef _
	#define _(a) en0->dst_address[a] = tmp0[a];
	foreach_mac_address_offset;
	#undef _

	sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];

	/* Send pkt back out the RX interface */
	vnet_buffer(b0)->sw_if_index[VLIB_TX] = sw_if_index0;

	if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
	&& (b0->flags & VLIB_BUFFER_IS_TRACED))) {
	sample_trace_t *t =
	vlib_add_trace (vm, node, b0, sizeof (*t));
	t->sw_if_index = sw_if_index0;
	t->next_index = next0;
	clib_memcpy (t->new_src_mac, en0->src_address,
	sizeof (t->new_src_mac));
	clib_memcpy (t->new_dst_mac, en0->dst_address,
	sizeof (t->new_dst_mac));
	}

	pkts_swapped += 1;

	/* 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, sample_node.index,
	SAMPLE_ERROR_SWAPPED, pkts_swapped);
	return frame->n_vectors;
	}

	VLIB_REGISTER_NODE (sample_node) = {
	.function = sample_node_fn,
	.name = "sample",
	.vector_size = sizeof (u32),
	.format_trace = format_sample_trace,
	.type = VLIB_NODE_TYPE_INTERNAL,

	.n_errors = ARRAY_LEN(sample_error_strings),
	.error_strings = sample_error_strings,

	.n_next_nodes = SAMPLE_N_NEXT,

	/* edit / add dispositions here */
	.next_nodes = {
	[SAMPLE_NEXT_INTERFACE_OUTPUT] = "interface-output",
	},
	};