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authorOle Troan <ot@cisco.com>2019-03-07 13:03:26 +0100
committerDamjan Marion <dmarion@me.com>2019-03-07 14:29:13 +0000
commite098e78964c382a81756de0d2ae12deb95685400 (patch)
tree5277122e0d1e9498df41d033e5218d03205e7eee
parentd3d1205087783eb36c9e44d98a33a0f01adb47c9 (diff)
Remove local REPLY_MACRO so that socket transport works.
memif, lacp, nsh and cdp used local REPLY_MACROs. Remove and use those in api_helper.h Change-Id: Ib01d6ae5cff0b6f1cef90996a54b3177f0c53463 Signed-off-by: Ole Troan <ot@cisco.com>
-rw-r--r--src/plugins/cdp/cdp.c25
-rw-r--r--src/plugins/lacp/lacp_api.c38
-rw-r--r--src/plugins/memif/memif_api.c38
-rw-r--r--src/plugins/nsh/nsh_api.c40
4 files changed, 8 insertions, 133 deletions
diff --git a/src/plugins/cdp/cdp.c b/src/plugins/cdp/cdp.c
index 3356437a9ea..08456ac2faf 100644
--- a/src/plugins/cdp/cdp.c
+++ b/src/plugins/cdp/cdp.c
@@ -47,29 +47,8 @@
#include <cdp/cdp_all_api_h.h>
#undef vl_api_version
-/*
- * A handy macro to set up a message reply.
- * Assumes that the following variables are available:
- * mp - pointer to request message
- * rmp - pointer to reply message type
- * rv - return value
- */
-
-#define REPLY_MACRO(t) \
-do { \
- unix_shared_memory_queue_t * q = \
- vl_api_client_index_to_input_queue (mp->client_index); \
- if (!q) \
- return; \
- \
- rmp = vl_msg_api_alloc (sizeof (*rmp)); \
- rmp->_vl_msg_id = ntohs((t)+cm->msg_id_base); \
- rmp->context = mp->context; \
- rmp->retval = ntohl(rv); \
- \
- vl_msg_api_send_shmem (q, (u8 *)&rmp); \
-} while(0);
-
+#define REPLY_MSG_ID_BASE cm->msg_id_base
+#include <vlibapi/api_helper_macros.h>
/* List of message types that this plugin understands */
diff --git a/src/plugins/lacp/lacp_api.c b/src/plugins/lacp/lacp_api.c
index 8bb6fa90eb0..d23bf217bac 100644
--- a/src/plugins/lacp/lacp_api.c
+++ b/src/plugins/lacp/lacp_api.c
@@ -50,42 +50,8 @@
#include <lacp/lacp_all_api_h.h>
#undef vl_api_version
-/*
- * A handy macro to set up a message reply.
- * Assumes that the following variables are available:
- * mp - pointer to request message
- * rmp - pointer to reply message type
- * rv - return value
- */
-#define REPLY_MACRO(t) \
-do { \
- svm_queue_t * q = \
- vl_api_client_index_to_input_queue (mp->client_index); \
- if (!q) \
- return; \
- \
- rmp = vl_msg_api_alloc (sizeof (*rmp)); \
- rmp->_vl_msg_id = htons ((t)+lm->msg_id_base); \
- rmp->context = mp->context; \
- rmp->retval = htonl (rv); \
- \
- vl_msg_api_send_shmem (q, (u8 *)&rmp); \
-} while(0);
-
-#define REPLY_MACRO2(t, body) \
-do { \
- svm_queue_t * q = \
- vl_api_client_index_to_input_queue (mp->client_index); \
- if (!q) \
- return; \
- \
- rmp = vl_msg_api_alloc (sizeof (*rmp)); \
- rmp->_vl_msg_id = htons ((t)+lm->msg_id_base); \
- rmp->context = mp->context; \
- rmp->retval = htonl (rv); \
- do {body;} while (0); \
- vl_msg_api_send_shmem (q, (u8 *)&rmp); \
-} while(0);
+#define REPLY_MSG_ID_BASE lm->msg_id_base
+#include <vlibapi/api_helper_macros.h>
#define foreach_lacp_plugin_api_msg \
_(SW_INTERFACE_LACP_DUMP, sw_interface_lacp_dump)
diff --git a/src/plugins/memif/memif_api.c b/src/plugins/memif/memif_api.c
index 77a87cc709d..bbc9e5c7c4a 100644
--- a/src/plugins/memif/memif_api.c
+++ b/src/plugins/memif/memif_api.c
@@ -51,42 +51,8 @@
#include <memif/memif_all_api_h.h>
#undef vl_api_version
-/*
- * A handy macro to set up a message reply.
- * Assumes that the following variables are available:
- * mp - pointer to request message
- * rmp - pointer to reply message type
- * rv - return value
- */
-#define REPLY_MACRO(t) \
-do { \
- svm_queue_t * q = \
- vl_api_client_index_to_input_queue (mp->client_index); \
- if (!q) \
- return; \
- \
- rmp = vl_msg_api_alloc (sizeof (*rmp)); \
- rmp->_vl_msg_id = htons ((t)+mm->msg_id_base); \
- rmp->context = mp->context; \
- rmp->retval = htonl (rv); \
- \
- vl_msg_api_send_shmem (q, (u8 *)&rmp); \
-} while(0);
-
-#define REPLY_MACRO2(t, body) \
-do { \
- svm_queue_t * q = \
- vl_api_client_index_to_input_queue (mp->client_index); \
- if (!q) \
- return; \
- \
- rmp = vl_msg_api_alloc (sizeof (*rmp)); \
- rmp->_vl_msg_id = htons ((t)+mm->msg_id_base); \
- rmp->context = mp->context; \
- rmp->retval = htonl (rv); \
- do {body;} while (0); \
- vl_msg_api_send_shmem (q, (u8 *)&rmp); \
-} while(0);
+#define REPLY_MSG_ID_BASE mm->msg_id_base
+#include <vlibapi/api_helper_macros.h>
#define foreach_memif_plugin_api_msg \
_(MEMIF_SOCKET_FILENAME_ADD_DEL, memif_socket_filename_add_del) \
diff --git a/src/plugins/nsh/nsh_api.c b/src/plugins/nsh/nsh_api.c
index ccae5544c85..cf9fd574b34 100644
--- a/src/plugins/nsh/nsh_api.c
+++ b/src/plugins/nsh/nsh_api.c
@@ -57,44 +57,8 @@ typedef enum
#include <nsh/nsh.api.h>
#undef vl_msg_name_crc_list
-/*
- * A handy macro to set up a message reply.
- * Assumes that the following variables are available:
- * mp - pointer to request message
- * rmp - pointer to reply message type
- * rv - return value
- */
-
-#define REPLY_MACRO(t) \
- do { \
- unix_shared_memory_queue_t * q = \
- vl_api_client_index_to_input_queue (mp->client_index); \
- if (!q) \
- return; \
- \
- rmp = vl_msg_api_alloc (sizeof (*rmp)); \
- rmp->_vl_msg_id = ntohs((t)+nm->msg_id_base); \
- rmp->context = mp->context; \
- rmp->retval = ntohl(rv); \
- \
- vl_msg_api_send_shmem (q, (u8 *)&rmp); \
- } while(0);
-
-#define REPLY_MACRO2(t, body) \
- do { \
- unix_shared_memory_queue_t * q; \
- rv = vl_msg_api_pd_handler (mp, rv); \
- q = vl_api_client_index_to_input_queue (mp->client_index); \
- if (!q) \
- return; \
- \
- rmp = vl_msg_api_alloc (sizeof (*rmp)); \
- rmp->_vl_msg_id = ntohs((t)+nm->msg_id_base); \
- rmp->context = mp->context; \
- rmp->retval = ntohl(rv); \
- do {body;} while (0); \
- vl_msg_api_send_shmem (q, (u8 *)&rmp); \
- } while(0);
+#define REPLY_MSG_ID_BASE nm->msg_id_base
+#include <vlibapi/api_helper_macros.h>
/* List of message types that this plugin understands */
'#n568'>568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167
/*
 * 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.
 */
/*
  Copyright (c) 2005,2009 Eliot Dresselhaus

  Permission is hereby granted, free of charge, to any person obtaining
  a copy of this software and associated documentation files (the
  "Software"), to deal in the Software without restriction, including
  without limitation the rights to use, copy, modify, merge, publish,
  distribute, sublicense, and/or sell copies of the Software, and to
  permit persons to whom the Software is furnished to do so, subject to
  the following conditions:

  The above copyright notice and this permission notice shall be
  included in all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

#include <vppinfra/elog.h>
#include <vppinfra/cache.h>
#include <vppinfra/error.h>
#include <vppinfra/format.h>
#include <vppinfra/hash.h>
#include <vppinfra/math.h>
#include <vppinfra/lock.h>

static inline void
elog_lock (elog_main_t * em)
{
  if (PREDICT_FALSE (em->lock != 0))
    while (clib_atomic_test_and_set (em->lock))
      CLIB_PAUSE ();
}

static inline void
elog_unlock (elog_main_t * em)
{
  if (PREDICT_FALSE (em->lock != 0))
    {
      clib_atomic_release (em->lock);
    }
}

/* Non-inline version. */
void *
elog_event_data (elog_main_t * em,
		 elog_event_type_t * type, elog_track_t * track, u64 cpu_time)
{
  return elog_event_data_inline (em, type, track, cpu_time);
}

static void
new_event_type (elog_main_t * em, uword i)
{
  elog_event_type_t *t = vec_elt_at_index (em->event_types, i);

  if (!em->event_type_by_format)
    em->event_type_by_format =
      hash_create_vec ( /* size */ 0, sizeof (u8), sizeof (uword));

  t->type_index_plus_one = i + 1;
  hash_set_mem (em->event_type_by_format, t->format, i);
}

static uword
find_or_create_type (elog_main_t * em, elog_event_type_t * t)
{
  uword *p = hash_get_mem (em->event_type_by_format, t->format);
  uword i;

  if (p)
    i = p[0];
  else
    {
      i = vec_len (em->event_types);
      vec_add1 (em->event_types, t[0]);
      new_event_type (em, i);
    }

  return i;
}

/* External function to register types. */
word
elog_event_type_register (elog_main_t * em, elog_event_type_t * t)
{
  elog_event_type_t *static_type = t;
  word l;

  elog_lock (em);

  /* Multiple simultaneous registration attempts, */
  if (t->type_index_plus_one > 0)
    {
      elog_unlock (em);
      return t->type_index_plus_one - 1;
    }

  l = vec_len (em->event_types);

  t->type_index_plus_one = 1 + l;

  ASSERT (t->format);

  /* If format args are not specified try to be smart about providing defaults
     so most of the time user does not have to specify them. */
  if (!t->format_args)
    {
      uword i, l;
      char *this_arg;

      l = strlen (t->format);
      for (i = 0; i < l; i++)
	{
	  if (t->format[i] != '%')
	    continue;
	  if (i + 1 >= l)
	    continue;
	  if (t->format[i + 1] == '%')	/* %% */
	    continue;

	  switch (t->format[i + 1])
	    {
	    default:
	    case 'd':
	    case 'x':
	    case 'u':
	      this_arg = "i4";	/* size of u32 */
	      break;
	    case 'f':
	      this_arg = "f8";	/* defaults to f64 */
	      break;
	    case 's':
	      this_arg = "s0";	/* defaults to null terminated string. */
	      break;
	    }

	  t->format_args =
	    (char *) format ((u8 *) t->format_args, "%s", this_arg);
	}

      /* Null terminate. */
      vec_add1 (t->format_args, 0);
    }

  vec_add1 (em->event_types, t[0]);

  t = em->event_types + l;

  /* Make copies of strings for hashing etc. */
  if (t->function)
    t->format = (char *) format (0, "%s %s%c", t->function, t->format, 0);
  else
    t->format = (char *) format (0, "%s%c", t->format, 0);

  t->format_args = (char *) format (0, "%s%c", t->format_args, 0);

  /* Construct string table. */
  {
    uword i;
    t->n_enum_strings = static_type->n_enum_strings;
    for (i = 0; i < t->n_enum_strings; i++)
      {
	if (!static_type->enum_strings[i])
	  static_type->enum_strings[i] = "MISSING";
	vec_add1 (t->enum_strings_vector,
		  (char *) format (0, "%s%c", static_type->enum_strings[i],
				   0));
      }
  }

  new_event_type (em, l);
  elog_unlock (em);

  return l;
}

word
elog_track_register (elog_main_t * em, elog_track_t * t)
{
  word l;

  elog_lock (em);

  l = vec_len (em->tracks);

  t->track_index_plus_one = 1 + l;

  ASSERT (t->name);

  vec_add1 (em->tracks, t[0]);

  t = em->tracks + l;

  t->name = (char *) format (0, "%s%c", t->name, 0);

  elog_unlock (em);

  return l;
}

static uword
parse_2digit_decimal (char *p, uword * number)
{
  uword i = 0;
  u8 digits[2];

  digits[0] = digits[1] = 0;
  while (p[i] >= '0' && p[i] <= '9')
    {
      if (i >= 2)
	break;
      digits[i] = p[i] - '0';
      i++;
    }

  if (i >= 1 && i <= 2)
    {
      if (i == 1)
	*number = digits[0];
      else
	*number = 10 * digits[0] + digits[1];
      return i;
    }
  else
    return 0;
}

static u8 *
fixed_format (u8 * s, char *fmt, char *result, uword * result_len)
{
  char *f = fmt;
  char *percent;
  uword l = 0;

  while (1)
    {
      if (f[0] == 0)
	break;
      if (f[0] == '%' && f[1] != '%')
	break;
      f++;
    }
  if (f > fmt)
    vec_add (s, fmt, f - fmt);

  if (f[0] != '%')
    goto done;

  /* Skip percent. */
  percent = f++;

  /* Skip possible +-= justification. */
  f += f[0] == '+' || f[0] == '-' || f[0] == '=';

  /* Skip possible X.Y width. */
  while ((f[0] >= '0' && f[0] <= '9') || f[0] == '.')
    f++;

  /* Skip wlL as in e.g. %Ld. */
  f += f[0] == 'w' || f[0] == 'l' || f[0] == 'L';

  /* Finally skip format letter. */
  f += f[0] != 0;

  ASSERT (*result_len > f - percent);
  l = clib_min (f - percent, *result_len - 1);
  clib_memcpy (result, percent, l);
  result[l] = 0;

done:
  *result_len = f - fmt;
  return s;
}

u8 *
format_elog_event (u8 * s, va_list * va)
{
  elog_main_t *em = va_arg (*va, elog_main_t *);
  elog_event_t *e = va_arg (*va, elog_event_t *);
  elog_event_type_t *t;
  char *a, *f;
  void *d = (u8 *) e->data;
  char arg_format[64];

  t = vec_elt_at_index (em->event_types, e->type);

  f = t->format;
  a = t->format_args;
  while (1)
    {
      uword n_bytes = 0, n_digits, f_bytes = 0;

      f_bytes = sizeof (arg_format);
      s = fixed_format (s, f, arg_format, &f_bytes);
      f += f_bytes;

      if (a == 0 || a[0] == 0)
	{
	  /* Format must also be at end. */
	  ASSERT (f[0] == 0);
	  break;
	}

      /* Don't go past end of event data. */
      ASSERT (d < (void *) (e->data + sizeof (e->data)));

      n_digits = parse_2digit_decimal (a + 1, &n_bytes);
      switch (a[0])
	{
	case 'i':
	case 't':
	case 'T':
	  {
	    u32 i = 0;
	    u64 l = 0;

	    if (n_bytes == 1)
	      i = ((u8 *) d)[0];
	    else if (n_bytes == 2)
	      i = clib_mem_unaligned (d, u16);
	    else if (n_bytes == 4)
	      i = clib_mem_unaligned (d, u32);
	    else if (n_bytes == 8)
	      l = clib_mem_unaligned (d, u64);
	    else
	      ASSERT (0);
	    if (a[0] == 't')
	      {
		char *e =
		  vec_elt (t->enum_strings_vector, n_bytes == 8 ? l : i);
		s = format (s, arg_format, e);
	      }
	    else if (a[0] == 'T')
	      {
		char *e =
		  vec_elt_at_index (em->string_table, n_bytes == 8 ? l : i);
		s = format (s, arg_format, e);
	      }
	    else if (n_bytes == 8)
	      s = format (s, arg_format, l);
	    else
	      s = format (s, arg_format, i);
	  }
	  break;

	case 'f':
	  {
	    f64 x = 0;
	    if (n_bytes == 4)
	      x = clib_mem_unaligned (d, f32);
	    else if (n_bytes == 8)
	      x = clib_mem_unaligned (d, f64);
	    else
	      ASSERT (0);
	    s = format (s, arg_format, x);
	  }
	  break;

	case 's':
	  s = format (s, arg_format, d);
	  if (n_bytes == 0)
	    n_bytes = strlen (d) + 1;
	  break;

	default:
	  ASSERT (0);
	  break;
	}

      ASSERT (n_digits > 0 && n_digits <= 2);
      a += 1 + n_digits;
      d += n_bytes;
    }

  return s;
}

u8 *
format_elog_track_name (u8 * s, va_list * va)
{
  elog_main_t *em = va_arg (*va, elog_main_t *);
  elog_event_t *e = va_arg (*va, elog_event_t *);
  elog_track_t *t = vec_elt_at_index (em->tracks, e->track);
  return format (s, "%s", t->name);
}

u8 *
format_elog_track (u8 * s, va_list * args)
{
  elog_main_t *em = va_arg (*args, elog_main_t *);
  f64 dt = va_arg (*args, f64);
  int track_index = va_arg (*args, int);
  elog_event_t *e, *es;
  u8 indent;

  indent = format_get_indent (s) + 1;

  es = elog_peek_events (em);
  vec_foreach (e, es)
  {
    if (e->track != track_index)
      continue;
    s = format (s, "%U%18.9f: %U\n", format_white_space, indent, e->time + dt,
		format_elog_event, em, e);
  }
  vec_free (es);
  return s;
}

void
elog_time_now (elog_time_stamp_t * et)
{
  u64 cpu_time_now, os_time_now_nsec;
  struct timespec ts;

#ifdef CLIB_UNIX
  {
#include <sys/syscall.h>
#ifdef __APPLE__
    clock_gettime (CLOCK_REALTIME, &ts);
#else
    syscall (SYS_clock_gettime, CLOCK_REALTIME, &ts);
#endif
    cpu_time_now = clib_cpu_time_now ();
    /* Subtract 3/30/2017's worth of seconds to retain precision */
    os_time_now_nsec = 1e9 * (ts.tv_sec - 1490885108) + ts.tv_nsec;
  }
#else
  cpu_time_now = clib_cpu_time_now ();
  os_time_now_nsec = 0;
#endif

  et->cpu = cpu_time_now;
  et->os_nsec = os_time_now_nsec;
}

always_inline i64
elog_time_stamp_diff_os_nsec (elog_time_stamp_t * t1, elog_time_stamp_t * t2)
{
  return (i64) t1->os_nsec - (i64) t2->os_nsec;
}

always_inline i64
elog_time_stamp_diff_cpu (elog_time_stamp_t * t1, elog_time_stamp_t * t2)
{
  return (i64) t1->cpu - (i64) t2->cpu;
}

always_inline f64
elog_nsec_per_clock (elog_main_t * em)
{
  return ((f64) elog_time_stamp_diff_os_nsec (&em->serialize_time,
					      &em->init_time)
	  / (f64) elog_time_stamp_diff_cpu (&em->serialize_time,
					    &em->init_time));
}

void
elog_alloc (elog_main_t * em, u32 n_events)
{
  if (em->event_ring)
    vec_free (em->event_ring);

  /* Ring size must be a power of 2. */
  em->event_ring_size = n_events = max_pow2 (n_events);

  /* Leave an empty ievent at end so we can always speculatively write
     and event there (possibly a long form event). */
  vec_resize_aligned (em->event_ring, n_events, CLIB_CACHE_LINE_BYTES);
}

void
elog_init (elog_main_t * em, u32 n_events)
{
  clib_memset (em, 0, sizeof (em[0]));

  em->lock = 0;

  if (n_events > 0)
    elog_alloc (em, n_events);

  clib_time_init (&em->cpu_timer);

  em->n_total_events_disable_limit = ~0;

  /* Make track 0. */
  em->default_track.name = "default";
  elog_track_register (em, &em->default_track);

  elog_time_now (&em->init_time);
  em->string_table_hash = hash_create_string (0, sizeof (uword));
}

/* Returns number of events in ring and start index. */
static uword
elog_event_range (elog_main_t * em, uword * lo)
{
  uword l = em->event_ring_size;
  u64 i = em->n_total_events;

  /* Ring never wrapped? */
  if (i <= (u64) l)
    {
      if (lo)
	*lo = 0;
      return i;
    }
  else
    {
      if (lo)
	*lo = i & (l - 1);
      return l;
    }
}

elog_event_t *
elog_peek_events (elog_main_t * em)
{
  elog_event_t *e, *f, *es = 0;
  uword i, j, n;

  n = elog_event_range (em, &j);
  for (i = 0; i < n; i++)
    {
      vec_add2 (es, e, 1);
      f = vec_elt_at_index (em->event_ring, j);
      e[0] = f[0];

      /* Convert absolute time from cycles to seconds from start. */
      e->time =
	(e->time_cycles -
	 em->init_time.cpu) * em->cpu_timer.seconds_per_clock;

      j = (j + 1) & (em->event_ring_size - 1);
    }

  return es;
}

/* Add a formatted string to the string table. */
u32
elog_string (elog_main_t * em, char *fmt, ...)
{
  u32 offset;
  uword *p;
  uword len;
  va_list va;

  elog_lock (em);
  vec_reset_length (em->string_table_tmp);
  va_start (va, fmt);
  em->string_table_tmp = va_format (em->string_table_tmp, fmt, &va);
  va_end (va);

  /* String table entries MUST be NULL terminated */
  len = vec_len (em->string_table_tmp);
  ASSERT (len > 0);
  if (em->string_table_tmp[len - 1] != 0)
    vec_add1 (em->string_table_tmp, 0);

  /* See if we already have this string in the string table */
  p = hash_get_mem (em->string_table_hash, em->string_table_tmp);

  /* We already have the string, so give the caller its offset */
  if (p)
    {
      elog_unlock (em);
      return (p[0]);
    }

  /* We don't, so add it. */

  offset = vec_len (em->string_table);
  vec_append (em->string_table, em->string_table_tmp);

  hash_set_mem (em->string_table_hash, em->string_table_tmp, offset);

  /* We gave the key to the string table hash, so we can't reuse it! */
  em->string_table_tmp = 0;
  elog_unlock (em);

  return offset;
}

elog_event_t *
elog_get_events (elog_main_t * em)
{
  if (!em->events)
    em->events = elog_peek_events (em);
  return em->events;
}

static void
maybe_fix_string_table_offset (elog_event_t * e,
			       elog_event_type_t * t, u32 offset)
{
  void *d = (u8 *) e->data;
  char *a;

  if (offset == 0)
    return;

  a = t->format_args;

  while (1)
    {
      uword n_bytes = 0, n_digits;

      if (a[0] == 0)
	break;

      /* Don't go past end of event data. */
      ASSERT (d < (void *) (e->data + sizeof (e->data)));

      n_digits = parse_2digit_decimal (a + 1, &n_bytes);
      switch (a[0])
	{
	case 'T':
	  ASSERT (n_bytes == 4);
	  clib_mem_unaligned (d, u32) += offset;
	  break;

	case 'i':
	case 't':
	case 'f':
	case 's':
	  break;

	default:
	  ASSERT (0);
	  break;
	}

      ASSERT (n_digits > 0 && n_digits <= 2);
      a += 1 + n_digits;
      d += n_bytes;
    }
}

static int
elog_cmp (void *a1, void *a2)
{
  elog_event_t *e1 = a1;
  elog_event_t *e2 = a2;

  if (e1->time < e2->time)
    return -1;

  if (e1->time > e2->time)
    return 1;

  return 0;
}

/*
 * merge two event logs. Complicated and cranky.
 */
void
elog_merge (elog_main_t * dst, u8 * dst_tag, elog_main_t * src, u8 * src_tag,
	    f64 align_tweak)
{
  elog_event_t *e;
  uword l;
  u32 string_table_offset_for_src_events;
  u32 track_offset_for_src_tracks;
  elog_track_t newt;
  int i;

  clib_memset (&newt, 0, sizeof (newt));

  /* Acquire src and dst events */
  elog_get_events (src);
  elog_get_events (dst);

  string_table_offset_for_src_events = vec_len (dst->string_table);
  vec_append (dst->string_table, src->string_table);

  l = vec_len (dst->events);
  vec_append (dst->events, src->events);

  /* Prepend the supplied tag (if any) to all dst track names */
  if (dst_tag)
    {
      for (i = 0; i < vec_len (dst->tracks); i++)
	{
	  elog_track_t *t = vec_elt_at_index (dst->tracks, i);
	  char *new_name;

	  new_name = (char *) format (0, "%s:%s%c", dst_tag, t->name, 0);
	  vec_free (t->name);
	  t->name = new_name;
	}
    }

  /*
   * Remember where we started allocating new tracks while merging
   */
  track_offset_for_src_tracks = vec_len (dst->tracks);

  /* Copy / tag source tracks */
  for (i = 0; i < vec_len (src->tracks); i++)
    {
      elog_track_t *t = vec_elt_at_index (src->tracks, i);
      if (src_tag)
	newt.name = (char *) format (0, "%s:%s%c", src_tag, t->name, 0);
      else
	newt.name = (char *) format (0, "%s%c", t->name, 0);
      (void) elog_track_register (dst, &newt);
      vec_free (newt.name);
    }

  /* Across all (copied) src events... */
  for (e = dst->events + l; e < vec_end (dst->events); e++)
    {
      elog_event_type_t *t = vec_elt_at_index (src->event_types, e->type);

      /* Remap type from src -> dst. */
      e->type = find_or_create_type (dst, t);

      /* Remap string table offsets for 'T' format args */
      maybe_fix_string_table_offset (e, t,
				     string_table_offset_for_src_events);

      /* Remap track */
      e->track += track_offset_for_src_tracks;
    }

  /* Adjust event times for relative starting times of event streams. */
  {
    f64 dt_event, dt_os_nsec, dt_clock_nsec;

    /* Set clock parameters if dst was not generated by unserialize. */
    if (dst->serialize_time.cpu == 0)
      {
	dst->init_time = src->init_time;
	dst->serialize_time = src->serialize_time;
	dst->nsec_per_cpu_clock = src->nsec_per_cpu_clock;
      }

    dt_os_nsec =
      elog_time_stamp_diff_os_nsec (&src->init_time, &dst->init_time);

    dt_event = dt_os_nsec;
    dt_clock_nsec =
      (elog_time_stamp_diff_cpu (&src->init_time, &dst->init_time) * .5 *
       (dst->nsec_per_cpu_clock + src->nsec_per_cpu_clock));

    /*
     * Heuristic to see if src/dst came from same time source.
     * If frequencies are "the same" and os clock and cpu clock agree
     * to within 100e-9 secs about time difference between src/dst
     * init_time, then we use cpu clock.  Otherwise we use OS clock.
     *
     * When merging event logs from different systems, time paradoxes
     * at the O(1ms) level are to be expected. Hence, the "align_tweak"
     * parameter. If two events logged on different processors are known
     * to occur in a specific order - and with a reasonably-estimated
     * interval - supply a non-zero "align_tweak" parameter
     */
    if (fabs (src->nsec_per_cpu_clock - dst->nsec_per_cpu_clock) < 1e-2
	&& fabs (dt_os_nsec - dt_clock_nsec) < 100)
      dt_event = dt_clock_nsec;

    /* Convert to seconds. */
    dt_event *= 1e-9;

    /*
     * Move the earlier set of events later, to avoid creating
     * events which precede the Big Bang (aka have negative timestamps).
     *
     * Not to any scale, we have something like the following picture:
     *
     * DST capture start point
     *       ^
     *       +--- dt_event --+
     *                       v
     *                 SRC capture start point
     *
     * In this case dt_event is positive, src started after dst,
     * to put src events onto a common timebase we have to move them
     * forward in time. Naturally, the opposite case is
     * possible, too: dt_event will be negative, and so we have to
     * move dst events forward in time by the |dt_event|.
     * In both cases, we add align_tweak.
     */
    if (dt_event > 0)
      {
	/* Src started after dst. */
	for (e = dst->events + l; e < vec_end (dst->events); e++)
	  e->time += dt_event + align_tweak;
      }
    else
      {
	/* Dst started after src. */
	dt_event = -dt_event;
	for (e = dst->events + 0; e < dst->events + l; e++)
	  e->time += dt_event + align_tweak;
      }
  }

  /* Sort events by increasing time. */
  vec_sort_with_function (dst->events, elog_cmp);

  dst->n_total_events = vec_len (dst->events);

  /* Recreate the event ring or the results won't serialize */
  {
    int i;

    ASSERT (dst->cpu_timer.seconds_per_clock);

    elog_alloc (dst, vec_len (dst->events));
    for (i = 0; i < vec_len (dst->events); i++)
      {
	elog_event_t *es, *ed;

	es = dst->events + i;
	ed = dst->event_ring + i;

	ed[0] = es[0];
      }
  }
}

static void
serialize_elog_event (serialize_main_t * m, va_list * va)
{
  elog_main_t *em = va_arg (*va, elog_main_t *);
  elog_event_t *e = va_arg (*va, elog_event_t *);
  elog_event_type_t *t = vec_elt_at_index (em->event_types, e->type);
  u8 *d = e->data;
  u8 *p = (u8 *) t->format_args;

  serialize_integer (m, e->type, sizeof (e->type));
  serialize_integer (m, e->track, sizeof (e->track));
  serialize (m, serialize_f64, e->time);

  while (*p)
    {
      uword n_digits, n_bytes = 0;

      n_digits = parse_2digit_decimal ((char *) p + 1, &n_bytes);

      switch (p[0])
	{
	case 'i':
	case 't':
	case 'T':
	  if (n_bytes == 1)
	    serialize_integer (m, d[0], sizeof (u8));
	  else if (n_bytes == 2)
	    serialize_integer (m, clib_mem_unaligned (d, u16), sizeof (u16));
	  else if (n_bytes == 4)
	    serialize_integer (m, clib_mem_unaligned (d, u32), sizeof (u32));
	  else if (n_bytes == 8)
	    serialize (m, serialize_64, clib_mem_unaligned (d, u64));
	  else
	    ASSERT (0);
	  break;

	case 's':
	  serialize_cstring (m, (char *) d);
	  if (n_bytes == 0)
	    n_bytes = strlen ((char *) d) + 1;
	  break;

	case 'f':
	  if (n_bytes == 4)
	    serialize (m, serialize_f32, clib_mem_unaligned (d, f32));
	  else if (n_bytes == 8)
	    serialize (m, serialize_f64, clib_mem_unaligned (d, f64));
	  else
	    ASSERT (0);
	  break;

	default:
	  ASSERT (0);
	  break;
	}

      p += 1 + n_digits;
      d += n_bytes;
    }
}

static void
unserialize_elog_event (serialize_main_t * m, va_list * va)
{
  elog_main_t *em = va_arg (*va, elog_main_t *);
  elog_event_t *e = va_arg (*va, elog_event_t *);
  elog_event_type_t *t;
  u8 *p, *d;

  {
    u16 tmp[2];

    unserialize_integer (m, &tmp[0], sizeof (e->type));
    unserialize_integer (m, &tmp[1], sizeof (e->track));

    e->type = tmp[0];
    e->track = tmp[1];

    /* Make sure it fits. */
    ASSERT (e->type == tmp[0]);
    ASSERT (e->track == tmp[1]);
  }

  t = vec_elt_at_index (em->event_types, e->type);

  unserialize (m, unserialize_f64, &e->time);

  d = e->data;
  p = (u8 *) t->format_args;

  while (p && *p)
    {
      uword n_digits, n_bytes = 0;
      u32 tmp;

      n_digits = parse_2digit_decimal ((char *) p + 1, &n_bytes);

      switch (p[0])
	{
	case 'i':
	case 't':
	case 'T':
	  if (n_bytes == 1)
	    {
	      unserialize_integer (m, &tmp, sizeof (u8));
	      d[0] = tmp;
	    }
	  else if (n_bytes == 2)
	    {
	      unserialize_integer (m, &tmp, sizeof (u16));
	      clib_mem_unaligned (d, u16) = tmp;
	    }
	  else if (n_bytes == 4)
	    {
	      unserialize_integer (m, &tmp, sizeof (u32));
	      clib_mem_unaligned (d, u32) = tmp;
	    }
	  else if (n_bytes == 8)
	    {
	      u64 x;
	      unserialize (m, unserialize_64, &x);
	      clib_mem_unaligned (d, u64) = x;
	    }
	  else
	    ASSERT (0);
	  break;

	case 's':
	  {
	    char *t;
	    unserialize_cstring (m, &t);
	    if (n_bytes == 0)
	      n_bytes = strlen (t) + 1;
	    clib_memcpy (d, t, clib_min (n_bytes, vec_len (t)));
	    vec_free (t);
	    break;
	  }

	case 'f':
	  if (n_bytes == 4)
	    {
	      f32 x;
	      unserialize (m, unserialize_f32, &x);
	      clib_mem_unaligned (d, f32) = x;
	    }
	  else if (n_bytes == 8)
	    {
	      f64 x;
	      unserialize (m, unserialize_f64, &x);
	      clib_mem_unaligned (d, f64) = x;
	    }
	  else
	    ASSERT (0);
	  break;

	default:
	  ASSERT (0);
	  break;
	}

      p += 1 + n_digits;
      d += n_bytes;
    }
}

static void
serialize_elog_event_type (serialize_main_t * m, va_list * va)
{
  elog_event_type_t *t = va_arg (*va, elog_event_type_t *);
  int n = va_arg (*va, int);
  int i, j;
  for (i = 0; i < n; i++)
    {
      serialize_cstring (m, t[i].format);
      serialize_cstring (m, t[i].format_args);
      serialize_integer (m, t[i].type_index_plus_one,
			 sizeof (t->type_index_plus_one));
      serialize_integer (m, t[i].n_enum_strings,
			 sizeof (t[i].n_enum_strings));
      for (j = 0; j < t[i].n_enum_strings; j++)
	serialize_cstring (m, t[i].enum_strings_vector[j]);
    }
}

static void
unserialize_elog_event_type (serialize_main_t * m, va_list * va)
{
  elog_event_type_t *t = va_arg (*va, elog_event_type_t *);
  int n = va_arg (*va, int);
  int i, j;
  for (i = 0; i < n; i++)
    {
      unserialize_cstring (m, &t[i].format);
      unserialize_cstring (m, &t[i].format_args);
      unserialize_integer (m, &t[i].type_index_plus_one,
			   sizeof (t->type_index_plus_one));
      unserialize_integer (m, &t[i].n_enum_strings,
			   sizeof (t[i].n_enum_strings));
      vec_resize (t[i].enum_strings_vector, t[i].n_enum_strings);
      for (j = 0; j < t[i].n_enum_strings; j++)
	unserialize_cstring (m, &t[i].enum_strings_vector[j]);
    }
}

static void
serialize_elog_track (serialize_main_t * m, va_list * va)
{
  elog_track_t *t = va_arg (*va, elog_track_t *);
  int n = va_arg (*va, int);
  int i;
  for (i = 0; i < n; i++)
    {
      serialize_cstring (m, t[i].name);
    }
}

static void
unserialize_elog_track (serialize_main_t * m, va_list * va)
{
  elog_track_t *t = va_arg (*va, elog_track_t *);
  int n = va_arg (*va, int);
  int i;
  for (i = 0; i < n; i++)
    {
      unserialize_cstring (m, &t[i].name);
    }
}

static void
serialize_elog_time_stamp (serialize_main_t * m, va_list * va)
{
  elog_time_stamp_t *st = va_arg (*va, elog_time_stamp_t *);
  serialize (m, serialize_64, st->os_nsec);
  serialize (m, serialize_64, st->cpu);
}

static void
unserialize_elog_time_stamp (serialize_main_t * m, va_list * va)
{
  elog_time_stamp_t *st = va_arg (*va, elog_time_stamp_t *);
  unserialize (m, unserialize_64, &st->os_nsec);
  unserialize (m, unserialize_64, &st->cpu);
}

static char *elog_serialize_magic = "elog v0";

void
serialize_elog_main (serialize_main_t * m, va_list * va)
{
  elog_main_t *em = va_arg (*va, elog_main_t *);
  int flush_ring = va_arg (*va, int);
  elog_event_t *e;

  serialize_magic (m, elog_serialize_magic, strlen (elog_serialize_magic));

  serialize_integer (m, em->event_ring_size, sizeof (u32));

  elog_time_now (&em->serialize_time);
  serialize (m, serialize_elog_time_stamp, &em->serialize_time);
  serialize (m, serialize_elog_time_stamp, &em->init_time);

  vec_serialize (m, em->event_types, serialize_elog_event_type);
  vec_serialize (m, em->tracks, serialize_elog_track);
  vec_serialize (m, em->string_table, serialize_vec_8);

  /* Free old events (cached) in case they have changed. */
  if (flush_ring)
    {
      vec_free (em->events);
      elog_get_events (em);
    }

  serialize_integer (m, vec_len (em->events), sizeof (u32));

  /* SMP logs can easily have local time paradoxes... */
  vec_sort_with_function (em->events, elog_cmp);

  vec_foreach (e, em->events) serialize (m, serialize_elog_event, em, e);
}

void
unserialize_elog_main (serialize_main_t * m, va_list * va)
{
  elog_main_t *em = va_arg (*va, elog_main_t *);
  uword i;
  u32 rs;

  unserialize_check_magic (m, elog_serialize_magic,
			   strlen (elog_serialize_magic));

  unserialize_integer (m, &rs, sizeof (u32));
  em->event_ring_size = rs;
  elog_init (em, em->event_ring_size);

  unserialize (m, unserialize_elog_time_stamp, &em->serialize_time);
  unserialize (m, unserialize_elog_time_stamp, &em->init_time);
  em->nsec_per_cpu_clock = elog_nsec_per_clock (em);

  vec_unserialize (m, &em->event_types, unserialize_elog_event_type);
  for (i = 0; i < vec_len (em->event_types); i++)
    new_event_type (em, i);

  vec_unserialize (m, &em->tracks, unserialize_elog_track);
  vec_unserialize (m, &em->string_table, unserialize_vec_8);

  {
    u32 ne;
    elog_event_t *e;

    unserialize_integer (m, &ne, sizeof (u32));
    vec_resize (em->events, ne);
    vec_foreach (e, em->events)
      unserialize (m, unserialize_elog_event, em, e);
  }
}

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