/*
 * Copyright (c) 2018 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 <plugins/gbp/gbp_sclass.h>
#include <vnet/l2/l2_input.h>
#include <vnet/l2/l2_output.h>

#define foreach_gbp_sclass                      \
  _(DROP,    "drop")

typedef enum
{
#define _(sym,str) GBP_SCLASS_NEXT_##sym,
  foreach_gbp_sclass
#undef _
    GBP_SCLASS_N_NEXT,
} gbp_sclass_next_t;

typedef struct gbp_sclass_trace_t_
{
  /* per-pkt trace data */
  u32 epg;
  u32 sclass;
} gbp_sclass_trace_t;

static_always_inline uword
gbp_sclass_inline (vlib_main_t * vm,
		   vlib_node_runtime_t * node,
		   vlib_frame_t * frame, int is_id_2_sclass, int is_l2)
{
  u32 n_left_from, *from, *to_next, next_index;
  gbp_sclass_main_t *glm;

  glm = &gbp_sclass_main;
  next_index = 0;
  n_left_from = frame->n_vectors;
  from = vlib_frame_vector_args (frame);

  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 > 0 && n_left_to_next > 0)
	{
	  gbp_sclass_next_t next0;
	  vlib_buffer_t *b0;
	  epg_id_t epg0;
	  u16 sclass0;
	  u32 bi0;

	  next0 = GBP_SCLASS_NEXT_DROP;
	  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);

	  if (is_id_2_sclass)
	    {
	      // output direction - convert from the SRC-EPD to the sclass
	      gbp_endpoint_group_t *gg;

	      epg0 = vnet_buffer2 (b0)->gbp.src_epg;
	      gg = gbp_epg_get (epg0);

	      if (NULL != gg)
		{
		  sclass0 = vnet_buffer2 (b0)->gbp.sclass = gg->gg_sclass;
		  if (is_l2)
		    next0 =
		      vnet_l2_feature_next (b0, glm->gel_l2_output_feat_next,
					    L2OUTPUT_FEAT_GBP_ID_2_SCLASS);
		  else
		    vnet_feature_next (&next0, b0);
		}
	      else
		sclass0 = 0;
	    }
	  else
	    {
	      /* input direction - convert from the sclass to the SRC-EGD */
	      sclass0 = vnet_buffer2 (b0)->gbp.sclass;
	      vnet_buffer2 (b0)->gbp.src_epg =
		gbp_epg_sclass_2_id (vnet_buffer2 (b0)->gbp.sclass);
	      epg0 = vnet_buffer2 (b0)->gbp.src_epg;

	      if (EPG_INVALID != epg0)
		{
		  if (is_l2)
		    next0 =
		      vnet_l2_feature_next (b0, glm->gel_l2_input_feat_next,
					    L2INPUT_FEAT_GBP_SCLASS_2_ID);
		  else
		    vnet_feature_next (&next0, b0);
		}
	    }

	  if (PREDICT_FALSE ((b0->flags & VLIB_BUFFER_IS_TRACED)))
	    {
	      gbp_sclass_trace_t *t =
		vlib_add_trace (vm, node, b0, sizeof (*t));
	      t->epg = epg0;
	      t->sclass = sclass0;
	    }

	  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);
    }

  return frame->n_vectors;
}

VLIB_NODE_FN (l2_gbp_id_2_sclass_node) (vlib_main_t * vm,
					vlib_node_runtime_t * node,
					vlib_frame_t * frame)
{
  return (gbp_sclass_inline (vm, node, frame, 1, 1));
}

VLIB_NODE_FN (l2_gbp_sclass_2_id_node) (vlib_main_t * vm,
					vlib_node_runtime_t * node,
					vlib_frame_t * frame)
{
  return (gbp_sclass_inline (vm, node, frame, 0, 1));
}

VLIB_NODE_FN (ip4_gbp_id_2_sclass_node) (vlib_main_t * vm,
					 vlib_node_runtime_t * node,
					 vlib_frame_t * frame)
{
  return (gbp_sclass_inline (vm, node, frame, 1, 0));
}

VLIB_NODE_FN (ip4_gbp_sclass_2_id_node) (vlib_main_t * vm,
					 vlib_node_runtime_t * node,
					 vlib_frame_t * frame)
{
  return (gbp_sclass_inline (vm, node, frame, 0, 0));
}

VLIB_NODE_FN (ip6_gbp_id_2_sclass_node) (vlib_main_t * vm,
					 vlib_node_runtime_t * node,
					 vlib_frame_t * frame)
{
  return (gbp_sclass_inline (vm, node, frame, 1, 0));
}

VLIB_NODE_FN (ip6_gbp_sclass_2_id_node) (vlib_main_t * vm,
					 vlib_node_runtime_t * node,
					 vlib_frame_t * frame)
{
  return (gbp_sclass_inline (vm, node, frame, 0, 0));
}

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

  s = format (s, "epg:%d sclass:%d", t->epg, t->sclass);

  return s;
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (l2_gbp_id_2_sclass_node) = {
  .name = "l2-gbp-id-2-sclass",
  .vector_size = sizeof (u32),
  .format_trace = format_gbp_sclass_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,

  .n_next_nodes = GBP_SCLASS_N_NEXT,

  .next_nodes = {
    [GBP_SCLASS_NEXT_DROP] = "error-drop",
  },
};
VLIB_REGISTER_NODE (l2_gbp_sclass_2_id_node) = {
  .name = "l2-gbp-sclass-2-id",
  .vector_size = sizeof (u32),
  .format_trace = format_gbp_sclass_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,

  .n_next_nodes = GBP_SCLASS_N_NEXT,

  .next_nodes = {
    [GBP_SCLASS_NEXT_DROP] = "error-drop",
  },
};

VLIB_REGISTER_NODE (ip4_gbp_id_2_sclass_node) = {
  .name = "ip4-gbp-id-2-sclass",
  .vector_size = sizeof (u32),
  .format_trace = format_gbp_sclass_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,

  .n_next_nodes = GBP_SCLASS_N_NEXT,

  .next_nodes = {
    [GBP_SCLASS_NEXT_DROP] = "error-drop",
  },
};
VLIB_REGISTER_NODE (ip4_gbp_sclass_2_id_node) = {
  .name = "ip4-gbp-sclass-2-id",
  .vector_size = sizeof (u32),
  .format_trace = format_gbp_sclass_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,

  .n_next_nodes = GBP_SCLASS_N_NEXT,

  .next_nodes = {
    [GBP_SCLASS_NEXT_DROP] = "error-drop",
  },
};

VLIB_REGISTER_NODE (ip6_gbp_id_2_sclass_node) = {
  .name = "ip6-gbp-id-2-sclass",
  .vector_size = sizeof (u32),
  .format_trace = format_gbp_sclass_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,

  .n_next_nodes = GBP_SCLASS_N_NEXT,

  .next_nodes = {
    [GBP_SCLASS_NEXT_DROP] = "error-drop",
  },
};
VLIB_REGISTER_NODE (ip6_gbp_sclass_2_id_node) = {
  .name = "ip6-gbp-sclass-2-id",
  .vector_size = sizeof (u32),
  .format_trace = format_gbp_sclass_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,

  .n_next_nodes = GBP_SCLASS_N_NEXT,

  .next_nodes = {
    [GBP_SCLASS_NEXT_DROP] = "error-drop",
  },
};


VNET_FEATURE_INIT (ip4_gbp_sclass_2_id_feat, static) =
{
  .arc_name = "ip4-unicast",
  .node_name = "ip4-gbp-sclass-2-id",
  .runs_before = VNET_FEATURES ("gbp-learn-ip4"),
};
VNET_FEATURE_INIT (ip6_gbp_sclass_2_id_feat, static) =
{
  .arc_name = "ip6-unicast",
  .node_name = "ip6-gbp-sclass-2-id",
  .runs_before = VNET_FEATURES ("gbp-learn-ip6"),
};
VNET_FEATURE_INIT (ip4_gbp_id_2_sclass_feat, static) =
{
  .arc_name = "ip4-output",
  .node_name = "ip4-gbp-id-2-sclass",
};
VNET_FEATURE_INIT (ip6_gbp_id_2_sclass_feat, static) =
{
  .arc_name = "ip6-output",
  .node_name = "ip6-gbp-id-2-sclass",
};
/* *INDENT-ON* */

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