summaryrefslogtreecommitdiffstats
path: root/src/vlib/punt.c
blob: 04e3b5a39569aecd998ceef3f4ca5ea25459bea8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
/*
 * 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.
 */
/**
 * @brief
 * The data-path object representing receiveing the packet, i.e. it's for-us
 */

#ifndef __RECEIVE_DPO_H__
#define __RECEIVE_DPO_H__

#include <vnet/dpo/dpo.h>
#include <vnet/ip/ip46_address.h>

typedef struct receive_dpo_t_
{
    /**
     * required for pool_get_aligned.
     *  memebers used in the switch path come first!
     */
    CLIB_CACHE_LINE_ALIGN_MARK(cacheline0);

    /**
     * The Software interface index on which traffic is received
     */
    u32 rd_sw_if_index;

    /**
     * The address on the receive interface. packet are destined to this address
     */
    ip46_address_t rd_addr;

    /**
     * number oflocks.
     */
    u16 rd_locks;
} receive_dpo_t;

extern int dpo_is_receive(const dpo_id_t *dpo);

extern void receive_dpo_add_or_lock (dpo_proto_t proto,
                                     u32 sw_if_index,
                                     const ip46_address_t *nh_addr,
                                     dpo_id_t *dpo);

extern void receive_dpo_module_init(void);

/**
 * @brief pool of all receive DPOs
 */
extern receive_dpo_t *receive_dpo_pool;

static inline receive_dpo_t *
receive_dpo_get (index_t index)
{
    return (pool_elt_at_index(receive_dpo_pool, index));
}

#endif
href='#n507'>507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678
/*
 * Copyright (c) 2019 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/punt.h>

/**
 * The last allocated punt reason
 * Value 0 is reserved for invalid index.
 */
static vlib_punt_reason_t punt_reason_last = 1;

/**
 * Counters per punt-reason
 */
vlib_combined_counter_main_t punt_counters = {
  .name = "punt",
  .stat_segment_name = "/net/punt",
};

/**
 * A punt reason
 */
typedef struct punt_reason_data_t_
{
  /**
   * The reason name
   */
  u8 *pd_name;

  /**
   * The allocated reason value
   */
  vlib_punt_reason_t pd_reason;

  /**
   * Clients/owners that have registered this reason
   */
  u32 *pd_owners;

  /**
   * clients interested/listening to this reason
   */
  u32 pd_users;

  /**
   * function to invoke if a client becomes interested in the code.
   */
  punt_interested_listener_t pd_fn;

  /**
   * Data to pass to the callback
   */
  void *pd_data;
} punt_reason_data_t;

/**
 * data for each punt reason
 */
static punt_reason_data_t *punt_reason_data;

typedef enum punt_format_flags_t_
{
  PUNT_FORMAT_FLAG_NONE = 0,
  PUNT_FORMAT_FLAG_DETAIL = (1 << 0),
} punt_format_flags_t;

/**
 * A registration, by a client, to direct punted traffic to a given node
 */
typedef struct punt_reg_t_
{
  /**
   * Reason the packets were punted
   */
  vlib_punt_reason_t pr_reason;

  /**
   * number of clients that have made this registration
   */
  u16 pr_locks;

  /**
   * The edge from the punt dispatch node to the requested node
   */
  u16 pr_edge;

  /**
   * node-index to send punted packets to
   */
  u32 pr_node_index;
} punt_reg_t;

/**
 * Pool of registrations
 */
static punt_reg_t *punt_reg_pool;

/**
 * A DB of all the register nodes against punt reason and node index
 */
static uword *punt_reg_db;

/**
 * A DB used in the DP per-reason to dispatch packets to the requested nodes.
 * this is a vector of edges per-reason
 */
u16 **punt_dp_db;

/**
 * A client using the punt serivce and its registrations
 */
typedef struct punt_client_t_
{
  /**
   * The name of the client
   */
  u8 *pc_name;

  /**
   * The registrations is has made
   */
  u32 *pc_regs;
} punt_client_t;

/**
 * Pool of clients
 */
static punt_client_t *punt_client_pool;

/**
 * DB of clients key'd by their name
 */
static uword *punt_client_db;

u8 *
format_vlib_punt_reason (u8 * s, va_list * args)
{
  vlib_punt_reason_t pr = va_arg (*args, int);

  return (format (s, "[%d] %v", pr, punt_reason_data[pr].pd_name));
}

vlib_punt_hdl_t
vlib_punt_client_register (const char *who)
{
  u8 *pc_name;
  uword *p;
  u32 pci;

  pc_name = format (NULL, "%s", who);
  p = hash_get_mem (punt_client_db, pc_name);

  if (NULL == p)
    {
      punt_client_t *pc;

      pool_get (punt_client_pool, pc);
      pci = pc - punt_client_pool;

      pc->pc_name = pc_name;

      hash_set_mem (punt_client_db, pc->pc_name, pci);
    }
  else
    {
      pci = p[0];
      vec_free (pc_name);
    }

  return (pci);
}

static int
punt_validate_client (vlib_punt_hdl_t client)
{
  return (!pool_is_free_index (punt_client_pool, client));
}

static u64
punt_reg_mk_key (vlib_punt_reason_t reason, u32 node_index)
{
  return (((u64) node_index) << 32 | reason);
}

static u32
punt_reg_find (vlib_punt_reason_t reason, u32 node_index)
{
  uword *p;

  p = hash_get (punt_reg_db, punt_reg_mk_key (reason, node_index));

  if (p)
    return p[0];

  return ~0;
}

static void
punt_reg_add (const punt_reg_t * pr)
{
  hash_set (punt_reg_db, punt_reg_mk_key (pr->pr_reason,
					  pr->pr_node_index),
	    pr - punt_reg_pool);
}

static void
punt_reg_remove (const punt_reg_t * pr)
{
  hash_unset (punt_reg_db, punt_reg_mk_key (pr->pr_reason,
					    pr->pr_node_index));
}

/**
 * reconstruct the DP per-reason DB
 */
static void
punt_reg_mk_dp (vlib_punt_reason_t reason)
{
  u32 pri, *prip, *pris;
  const punt_reg_t *pr;
  u16 *edges, *old;
  u64 key;

  pris = NULL;
  edges = NULL;
  vec_validate (punt_dp_db, reason);

  old = punt_dp_db[reason];

  /* *INDENT-OFF* */
  hash_foreach (key, pri, punt_reg_db,
    ({
      vec_add1(pris, pri);
    }));
  /* *INDENT-ON* */

  /*
   * A check for an empty vector is done in the DP, so the a zero
   * length vector here is ok
   */
  vec_foreach (prip, pris)
  {
    pr = pool_elt_at_index (punt_reg_pool, *prip);

    if (pr->pr_reason == reason)
      vec_add1 (edges, pr->pr_edge);
  }

  /* atomic update of the DP */
  punt_dp_db[reason] = edges;

  vec_free (old);
}

int
vlib_punt_register (vlib_punt_hdl_t client,
		    vlib_punt_reason_t reason, const char *node_name)
{
  vlib_node_t *punt_to, *punt_from;
  punt_client_t *pc;
  vlib_main_t *vm;
  punt_reg_t *pr;
  u32 pri;

  if (reason >= punt_reason_last)
    return -1;
  if (!punt_validate_client (client))
    return -2;

  vm = vlib_get_main ();
  pc = pool_elt_at_index (punt_client_pool, client);
  punt_to = vlib_get_node_by_name (vm, (u8 *) node_name);
  punt_from = vlib_get_node_by_name (vm, (u8 *) "punt-dispatch");

  /*
   * find a global matching registration
   */
  pri = punt_reg_find (reason, punt_to->index);

  if (~0 != pri)
    {
      u32 pos;

      pos = vec_search (pc->pc_regs, pri);

      if (~0 != pos)
	{
	  /* duplicate registration for this client */
	  return -1;
	}

      pr = pool_elt_at_index (punt_reg_pool, pri);
    }
  else
    {
      pool_get (punt_reg_pool, pr);

      pr->pr_reason = reason;
      pr->pr_node_index = punt_to->index;
      pr->pr_edge = vlib_node_add_next (vm,
					punt_from->index, pr->pr_node_index);

      pri = pr - punt_reg_pool;

      if (0 == punt_reason_data[reason].pd_users++ &&
	  NULL != punt_reason_data[reason].pd_fn)
	punt_reason_data[reason].pd_fn (VLIB_ENABLE,
					punt_reason_data[reason].pd_data);

      punt_reg_add (pr);
    }

  /*
   * add this reg to the list the client has made
   */
  pr->pr_locks++;
  vec_add1 (pc->pc_regs, pri);

  punt_reg_mk_dp (reason);

  return 0;
}

int
vlib_punt_unregister (vlib_punt_hdl_t client,
		      vlib_punt_reason_t reason, const char *node_name)
{
  vlib_node_t *punt_to;
  punt_client_t *pc;
  vlib_main_t *vm;
  punt_reg_t *pr;
  u32 pri;

  if (reason >= punt_reason_last)
    return -1;

  vm = vlib_get_main ();
  pc = pool_elt_at_index (punt_client_pool, client);
  punt_to = vlib_get_node_by_name (vm, (u8 *) node_name);

  /*
   * construct a registration and check if it's one this client already has
   */
  pri = punt_reg_find (reason, punt_to->index);

  if (~0 != pri)
    {
      u32 pos;

      pos = vec_search (pc->pc_regs, pri);

      if (~0 == pos)
	{
	  /* not a registration for this client */
	  return -1;
	}
      vec_del1 (pc->pc_regs, pos);

      pr = pool_elt_at_index (punt_reg_pool, pri);

      pr->pr_locks--;

      if (0 == pr->pr_locks)
	{
	  if (0 == --punt_reason_data[reason].pd_users &&
	      NULL != punt_reason_data[reason].pd_fn)
	    punt_reason_data[reason].pd_fn (VLIB_DISABLE,
					    punt_reason_data[reason].pd_data);
	  punt_reg_remove (pr);
	  pool_put (punt_reg_pool, pr);
	}
    }

  /*
   * rebuild the DP data-base
   */
  punt_reg_mk_dp (reason);

  return (0);
}

int
vlib_punt_reason_validate (vlib_punt_reason_t reason)
{
  if (reason < punt_reason_last)
    return (0);

  return (-1);
}

int
vlib_punt_reason_alloc (vlib_punt_hdl_t client,
			const char *reason_name,
			punt_interested_listener_t fn,
			void *data, vlib_punt_reason_t * reason)
{
  vlib_punt_reason_t new;

  if (!punt_validate_client (client))
    return -2;

  new = punt_reason_last++;
  vec_validate (punt_reason_data, new);
  punt_reason_data[new].pd_name = format (NULL, "%s", reason_name);
  punt_reason_data[new].pd_reason = new;
  punt_reason_data[new].pd_fn = fn;
  punt_reason_data[new].pd_data = data;
  vec_add1 (punt_reason_data[new].pd_owners, client);

  vlib_validate_combined_counter (&punt_counters, new);
  vlib_zero_combined_counter (&punt_counters, new);

  *reason = new;

  /* build the DP data-base */
  punt_reg_mk_dp (*reason);

  return (0);
}

void
punt_reason_walk (punt_reason_walk_cb_t cb, void *ctx)
{
  punt_reason_data_t *pd;

  for (pd = punt_reason_data + 1; pd < vec_end (punt_reason_data); pd++)
    {
      cb (pd->pd_reason, pd->pd_name, ctx);
    }
}

/* Parse node name -> node index. */
uword
unformat_punt_client (unformat_input_t * input, va_list * args)
{
  u32 *result = va_arg (*args, u32 *);

  return unformat_user (input, unformat_hash_vec_string,
			punt_client_db, result);
}

u8 *
format_punt_reg (u8 * s, va_list * args)
{
  u32 pri = va_arg (*args, u32);
  punt_reg_t *pr;

  pr = pool_elt_at_index (punt_reg_pool, pri);

  s = format (s, "%U -> %U",
	      format_vlib_punt_reason, pr->pr_reason,
	      format_vlib_node_name, vlib_get_main (), pr->pr_node_index);

  return (s);
}

u8 *
format_punt_reason_data (u8 * s, va_list * args)
{
  punt_reason_data_t *pd = va_arg (*args, punt_reason_data_t *);
  punt_client_t *pc;
  u32 *pci;

  s = format (s, "[%d] %v from:[", pd->pd_reason, pd->pd_name);
  vec_foreach (pci, pd->pd_owners)
  {
    pc = pool_elt_at_index (punt_client_pool, *pci);
    s = format (s, "%v ", pc->pc_name);
  }
  s = format (s, "]");

  return (s);
}

u8 *
format_punt_client (u8 * s, va_list * args)
{
  u32 pci = va_arg (*args, u32);
  punt_format_flags_t flags = va_arg (*args, punt_format_flags_t);
  punt_client_t *pc;

  pc = pool_elt_at_index (punt_client_pool, pci);

  s = format (s, "%v", pc->pc_name);

  if (flags & PUNT_FORMAT_FLAG_DETAIL)
    {
      punt_reason_data_t *pd;
      u32 *pri;

      s = format (s, "\n registrations:");
      vec_foreach (pri, pc->pc_regs)
      {
	s = format (s, "\n  [%U]", format_punt_reg, *pri);
      }

      s = format (s, "\n reasons:");

      vec_foreach (pd, punt_reason_data)
      {
	u32 *tmp;

	vec_foreach (tmp, pd->pd_owners)
	{
	  if (*tmp == pci)
	    s = format (s, "\n  %U", format_punt_reason_data, pd);
	}
      }
    }
  return (s);
}

static clib_error_t *
punt_client_show (vlib_main_t * vm,
		  unformat_input_t * input, vlib_cli_command_t * cmd)
{
  u32 pci = ~0;

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (input, "%U", unformat_punt_client, &pci))
	;
      else
	break;
    }

  if (~0 != pci)
    {
      vlib_cli_output (vm, "%U", format_punt_client, pci,
		       PUNT_FORMAT_FLAG_DETAIL);
    }
  else
    {
      u8 *name;

      /* *INDENT-OFF* */
      hash_foreach(name, pci, punt_client_db,
        ({
          vlib_cli_output (vm, "%U", format_punt_client, pci,
                           PUNT_FORMAT_FLAG_NONE);
        }));
      /* *INDENT-ON* */
    }

  return (NULL);
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (punt_client_show_command, static) =
{
  .path = "show punt client",
  .short_help = "show client[s] registered with the punt infra",
  .function = punt_client_show,
};
/* *INDENT-ON* */

static clib_error_t *
punt_reason_show (vlib_main_t * vm,
		  unformat_input_t * input, vlib_cli_command_t * cmd)
{
  const punt_reason_data_t *pd;

  vec_foreach (pd, punt_reason_data)
  {
    vlib_cli_output (vm, "%U", format_punt_reason_data, pd);
  }

  return (NULL);
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (punt_reason_show_command, static) =
{
  .path = "show punt reasons",
  .short_help = "show all punt reasons",
  .function = punt_reason_show,
};
/* *INDENT-ON* */

static clib_error_t *
punt_db_show (vlib_main_t * vm,
	      unformat_input_t * input, vlib_cli_command_t * cmd)
{
  u32 pri, ii, jj;
  u64 key;

  /* *INDENT-OFF* */
  hash_foreach (key, pri, punt_reg_db,
    ({
      vlib_cli_output (vm, " %U", format_punt_reg, pri);
    }));
  /* *INDENT-ON* */

  vlib_cli_output (vm, "\nDerived data-plane data-base:");
  vlib_cli_output (vm,
		   "  (for each punt-reason the edge[s] from punt-dispatch)");

  vec_foreach_index (ii, punt_dp_db)
  {
    u8 *s = NULL;
    vlib_cli_output (vm, " %U", format_vlib_punt_reason, ii);

    vec_foreach_index (jj, punt_dp_db[ii])
    {
      s = format (s, "%d ", punt_dp_db[ii][jj]);
    }
    vlib_cli_output (vm, "   [%v]", s);
    vec_free (s);
  }

  return (NULL);
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (punt_db_show_command, static) =
{
  .path = "show punt db",
  .short_help = "show the punt DB",
  .function = punt_db_show,
};
/* *INDENT-ON* */

static clib_error_t *
punt_stats_show (vlib_main_t * vm,
		 unformat_input_t * input, vlib_cli_command_t * cmd)
{
  vlib_combined_counter_main_t *cm = &punt_counters;
  vlib_counter_t c;
  u32 ii;

  for (ii = 0; ii < vlib_combined_counter_n_counters (cm); ii++)
    {
      vlib_get_combined_counter (cm, ii, &c);
      vlib_cli_output (vm, "%U packets:%lld bytes:%lld",
		       format_vlib_punt_reason, ii, c.packets, c.bytes);
    }

  return (NULL);
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (punt_stats_show_command, static) =
{
  .path = "show punt stats",
  .short_help = "show the punt stats",
  .function = punt_stats_show,
};
/* *INDENT-ON* */

static clib_error_t *
punt_init (vlib_main_t * vm)
{
  punt_client_db = hash_create_vec (0, sizeof (u8), sizeof (u32));

  return (NULL);
}

VLIB_INIT_FUNCTION (punt_init);

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