src/vnet/span/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 <vlib/vlib.h>
 #include <vnet/vnet.h>
 #include <vppinfra/error.h>

 #include <vnet/span/span.h>

 #include <vppinfra/error.h>
 #include <vppinfra/elog.h>

 vlib_node_registration_t span_node;

 /* packet trace format function */
 u8 *
 format_span_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 *);
   span_trace_t *t = va_arg (*args, span_trace_t *);

   vnet_main_t *vnm = &vnet_main;
   s = format (s, "SPAN: mirrored %U -> %U",
 	      format_vnet_sw_if_index_name, vnm, t->src_sw_if_index,
 	      format_vnet_sw_if_index_name, vnm, t->mirror_sw_if_index);

   return s;
 }

 #define foreach_span_error                      \
 _(HITS, "SPAN incomming packets processed")

 typedef enum
 {
 #define _(sym,str) SPAN_ERROR_##sym,
   foreach_span_error
 #undef _
     SPAN_N_ERROR,
 } span_error_t;

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

 static_always_inline void
 span_mirror (vlib_main_t * vm, vlib_node_runtime_t * node, u32 sw_if_index0,
 	     vlib_buffer_t * b0, vlib_frame_t ** mirror_frames, int is_rx)
 {
   vlib_buffer_t *c0;
   span_main_t *sm = &span_main;
   vnet_main_t *vnm = &vnet_main;
   span_interface_t *si0 = 0;
   u32 *to_mirror_next = 0;
   u32 i;

   si0 = vec_elt_at_index (sm->interfaces, sw_if_index0);

   if (is_rx != 0 && si0->num_rx_mirror_ports == 0)
     return;

   if (is_rx == 0 && si0->num_tx_mirror_ports == 0)
     return;

   /* Don't do it again */
   if (PREDICT_FALSE (b0->flags & VNET_BUFFER_SPAN_CLONE))
     return;

   /* *INDENT-OFF* */
   clib_bitmap_foreach (i, is_rx ? si0->rx_mirror_ports : si0->tx_mirror_ports, (
     {
       if (mirror_frames[i] == 0)
 	mirror_frames[i] = vnet_get_frame_to_sw_interface (vnm, i);
       to_mirror_next = vlib_frame_vector_args (mirror_frames[i]);
       to_mirror_next += mirror_frames[i]->n_vectors;
       /* This can fail */
       c0 = vlib_buffer_copy (vm, b0);
       if (PREDICT_TRUE(c0 != 0))
         {
           vnet_buffer (c0)->sw_if_index[VLIB_TX] = i;
           c0->flags |= VNET_BUFFER_SPAN_CLONE;
           to_mirror_next[0] = vlib_get_buffer_index (vm, c0);
           mirror_frames[i]->n_vectors++;
           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
             {
               span_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
               t->src_sw_if_index = sw_if_index0;
               t->mirror_sw_if_index = i;
             }
         }
     }));
   /* *INDENT-ON* */
 }

 static_always_inline uword
 span_node_inline_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
 		     vlib_frame_t * frame, int is_rx)
 {
   span_main_t *sm = &span_main;
   vnet_main_t *vnm = &vnet_main;
   u32 n_left_from, *from, *to_next;
   u32 n_span_packets = 0;
   u32 next_index;
   u32 sw_if_index;
   static __thread vlib_frame_t **mirror_frames = 0;
   vlib_rx_or_tx_t rxtx = is_rx ? VLIB_RX : VLIB_TX;

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

   vec_validate_aligned (mirror_frames, sm->max_sw_if_index,
 			CLIB_CACHE_LINE_BYTES);

   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 bi0;
 	  u32 bi1;
 	  vlib_buffer_t *b0;
 	  vlib_buffer_t *b1;
 	  u32 sw_if_index0;
 	  u32 next0 = 0;
 	  u32 sw_if_index1;
 	  u32 next1 = 0;

 	  /* speculatively enqueue b0, b1 to the current next frame */
 	  to_next[0] = bi0 = from[0];
 	  to_next[1] = bi1 = from[1];
 	  to_next += 2;
 	  n_left_to_next -= 2;
 	  from += 2;
 	  n_left_from -= 2;

 	  b0 = vlib_get_buffer (vm, bi0);
 	  b1 = vlib_get_buffer (vm, bi1);
 	  sw_if_index0 = vnet_buffer (b0)->sw_if_index[rxtx];
 	  sw_if_index1 = vnet_buffer (b1)->sw_if_index[rxtx];

 	  span_mirror (vm, node, sw_if_index0, b0, mirror_frames, is_rx);
 	  span_mirror (vm, node, sw_if_index1, b1, mirror_frames, is_rx);

 	  vnet_feature_next (sw_if_index0, &next0, b0);
 	  vnet_feature_next (sw_if_index1, &next1, b1);

 	  /* verify speculative enqueue, 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 sw_if_index0;
 	  u32 next0 = 0;

 	  /* speculatively enqueue b0 to the current next frame */
 	  to_next[0] = bi0 = from[0];
 	  to_next += 1;
 	  n_left_to_next -= 1;
 	  from += 1;
 	  n_left_from -= 1;

 	  b0 = vlib_get_buffer (vm, bi0);
 	  sw_if_index0 = vnet_buffer (b0)->sw_if_index[rxtx];

 	  span_mirror (vm, node, sw_if_index0, b0, mirror_frames, is_rx);

 	  vnet_feature_next (sw_if_index0, &next0, b0);

 	  /* 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);
     }


   for (sw_if_index = 0; sw_if_index < vec_len (mirror_frames); sw_if_index++)
     {
       if (mirror_frames[sw_if_index] == 0)
 	continue;

       vnet_put_frame_to_sw_interface (vnm, sw_if_index,
 				      mirror_frames[sw_if_index]);
       mirror_frames[sw_if_index] = 0;
     }
   vlib_node_increment_counter (vm, span_node.index, SPAN_ERROR_HITS,
 			       n_span_packets);

   return frame->n_vectors;
 }

 static uword
 span_input_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
 		    vlib_frame_t * frame)
 {
   return span_node_inline_fn (vm, node, frame, 1);
 }

 static uword
 span_output_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
 		     vlib_frame_t * frame)
 {
   return span_node_inline_fn (vm, node, frame, 0);
 }

 /* *INDENT-OFF* */
 VLIB_REGISTER_NODE (span_input_node) = {
   .function = span_input_node_fn,
   .name = "span-input",
   .vector_size = sizeof (u32),
   .format_trace = format_span_trace,
   .type = VLIB_NODE_TYPE_INTERNAL,

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

   .n_next_nodes = 0,

   /* edit / add dispositions here */
   .next_nodes = {
     [0] = "error-drop",
   },
 };

 VLIB_NODE_FUNCTION_MULTIARCH (span_input_node, span_input_node_fn)

 VLIB_REGISTER_NODE (span_output_node) = {
   .function = span_output_node_fn,
   .name = "span-output",
   .vector_size = sizeof (u32),
   .format_trace = format_span_trace,
   .type = VLIB_NODE_TYPE_INTERNAL,

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

   .n_next_nodes = 0,

   /* edit / add dispositions here */
   .next_nodes = {
     [0] = "error-drop",
   },
 };

 VLIB_NODE_FUNCTION_MULTIARCH (span_output_node, span_output_node_fn)

 /* *INDENT-ON* */

 /*
  * 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 <vlib/vlib.h>
	#include <vnet/vnet.h>
	#include <vppinfra/error.h>

	#include <vnet/span/span.h>

	#include <vppinfra/error.h>
	#include <vppinfra/elog.h>

	vlib_node_registration_t span_node;

	/* packet trace format function */
	u8 *
	format_span_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 );
	span_trace_t t = va_arg (args, span_trace_t *);

	vnet_main_t *vnm = &vnet_main;
	s = format (s, "SPAN: mirrored %U -> %U",
	format_vnet_sw_if_index_name, vnm, t->src_sw_if_index,
	format_vnet_sw_if_index_name, vnm, t->mirror_sw_if_index);

	return s;
	}

	#define foreach_span_error \
	_(HITS, "SPAN incomming packets processed")

	typedef enum
	{
	#define _(sym,str) SPAN_ERROR_##sym,
	foreach_span_error
	#undef _
	SPAN_N_ERROR,
	} span_error_t;

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

	static_always_inline void
	span_mirror (vlib_main_t * vm, vlib_node_runtime_t * node, u32 sw_if_index0,
	vlib_buffer_t * b0, vlib_frame_t ** mirror_frames, int is_rx)
	{
	vlib_buffer_t *c0;
	span_main_t *sm = &span_main;
	vnet_main_t *vnm = &vnet_main;
	span_interface_t *si0 = 0;
	u32 *to_mirror_next = 0;
	u32 i;

	si0 = vec_elt_at_index (sm->interfaces, sw_if_index0);

	if (is_rx != 0 && si0->num_rx_mirror_ports == 0)
	return;

	if (is_rx == 0 && si0->num_tx_mirror_ports == 0)
	return;

	/* Don't do it again */
	if (PREDICT_FALSE (b0->flags & VNET_BUFFER_SPAN_CLONE))
	return;

	/* INDENT-OFF */
	clib_bitmap_foreach (i, is_rx ? si0->rx_mirror_ports : si0->tx_mirror_ports, (
	{
	if (mirror_frames[i] == 0)
	mirror_frames[i] = vnet_get_frame_to_sw_interface (vnm, i);
	to_mirror_next = vlib_frame_vector_args (mirror_frames[i]);
	to_mirror_next += mirror_frames[i]->n_vectors;
	/* This can fail */
	c0 = vlib_buffer_copy (vm, b0);
	if (PREDICT_TRUE(c0 != 0))
	{
	vnet_buffer (c0)->sw_if_index[VLIB_TX] = i;
	c0->flags \|= VNET_BUFFER_SPAN_CLONE;
	to_mirror_next[0] = vlib_get_buffer_index (vm, c0);
	mirror_frames[i]->n_vectors++;
	if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
	{
	span_trace_t t = vlib_add_trace (vm, node, b0, sizeof (t));
	t->src_sw_if_index = sw_if_index0;
	t->mirror_sw_if_index = i;
	}
	}
	}));
	/* INDENT-ON */
	}

	static_always_inline uword
	span_node_inline_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
	vlib_frame_t * frame, int is_rx)
	{
	span_main_t *sm = &span_main;
	vnet_main_t *vnm = &vnet_main;
	u32 n_left_from, from, to_next;
	u32 n_span_packets = 0;
	u32 next_index;
	u32 sw_if_index;
	static __thread vlib_frame_t **mirror_frames = 0;
	vlib_rx_or_tx_t rxtx = is_rx ? VLIB_RX : VLIB_TX;

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

	vec_validate_aligned (mirror_frames, sm->max_sw_if_index,
	CLIB_CACHE_LINE_BYTES);

	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 bi0;
	u32 bi1;
	vlib_buffer_t *b0;
	vlib_buffer_t *b1;
	u32 sw_if_index0;
	u32 next0 = 0;
	u32 sw_if_index1;
	u32 next1 = 0;

	/* speculatively enqueue b0, b1 to the current next frame */
	to_next[0] = bi0 = from[0];
	to_next[1] = bi1 = from[1];
	to_next += 2;
	n_left_to_next -= 2;
	from += 2;
	n_left_from -= 2;

	b0 = vlib_get_buffer (vm, bi0);
	b1 = vlib_get_buffer (vm, bi1);
	sw_if_index0 = vnet_buffer (b0)->sw_if_index[rxtx];
	sw_if_index1 = vnet_buffer (b1)->sw_if_index[rxtx];

	span_mirror (vm, node, sw_if_index0, b0, mirror_frames, is_rx);
	span_mirror (vm, node, sw_if_index1, b1, mirror_frames, is_rx);

	vnet_feature_next (sw_if_index0, &next0, b0);
	vnet_feature_next (sw_if_index1, &next1, b1);

	/* verify speculative enqueue, 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 sw_if_index0;
	u32 next0 = 0;

	/* speculatively enqueue b0 to the current next frame */
	to_next[0] = bi0 = from[0];
	to_next += 1;
	n_left_to_next -= 1;
	from += 1;
	n_left_from -= 1;

	b0 = vlib_get_buffer (vm, bi0);
	sw_if_index0 = vnet_buffer (b0)->sw_if_index[rxtx];

	span_mirror (vm, node, sw_if_index0, b0, mirror_frames, is_rx);

	vnet_feature_next (sw_if_index0, &next0, b0);

	/* 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);
	}


	for (sw_if_index = 0; sw_if_index < vec_len (mirror_frames); sw_if_index++)
	{
	if (mirror_frames[sw_if_index] == 0)
	continue;

	vnet_put_frame_to_sw_interface (vnm, sw_if_index,
	mirror_frames[sw_if_index]);
	mirror_frames[sw_if_index] = 0;
	}
	vlib_node_increment_counter (vm, span_node.index, SPAN_ERROR_HITS,
	n_span_packets);

	return frame->n_vectors;
	}

	static uword
	span_input_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
	vlib_frame_t * frame)
	{
	return span_node_inline_fn (vm, node, frame, 1);
	}

	static uword
	span_output_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
	vlib_frame_t * frame)
	{
	return span_node_inline_fn (vm, node, frame, 0);
	}

	/* INDENT-OFF */
	VLIB_REGISTER_NODE (span_input_node) = {
	.function = span_input_node_fn,
	.name = "span-input",
	.vector_size = sizeof (u32),
	.format_trace = format_span_trace,
	.type = VLIB_NODE_TYPE_INTERNAL,

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

	.n_next_nodes = 0,

	/* edit / add dispositions here */
	.next_nodes = {
	[0] = "error-drop",
	},
	};

	VLIB_NODE_FUNCTION_MULTIARCH (span_input_node, span_input_node_fn)

	VLIB_REGISTER_NODE (span_output_node) = {
	.function = span_output_node_fn,
	.name = "span-output",
	.vector_size = sizeof (u32),
	.format_trace = format_span_trace,
	.type = VLIB_NODE_TYPE_INTERNAL,

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

	.n_next_nodes = 0,

	/* edit / add dispositions here */
	.next_nodes = {
	[0] = "error-drop",
	},
	};

	VLIB_NODE_FUNCTION_MULTIARCH (span_output_node, span_output_node_fn)

	/* INDENT-ON */

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