/*

  This file is provided under a dual BSD/GPLv2 license.  When using or
  redistributing this file, you may do so under either license.

  GPL LICENSE SUMMARY

  Copyright(c) 2015 Intel Corporation.

  This program is free software; you can redistribute it and/or modify
  it under the terms of version 2 of the GNU General Public License as
  published by the Free Software Foundation.

  This program is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  General Public License for more details.

  Contact Information:
  Intel Corporation, www.intel.com

  BSD LICENSE

  Copyright(c) 2015 Intel Corporation.

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions
  are met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in
      the documentation and/or other materials provided with the
      distribution.
    * Neither the name of Intel Corporation nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

/* Copyright (c) 2003-2014 Intel Corporation. All rights reserved. */

#include "psm_user.h"
#include "psm_mq_internal.h"

struct psmi_stats_type {
	STAILQ_ENTRY(psmi_stats_type) next;
	struct psmi_stats_entry *entries;

	int num_entries;
	void *heading;
	uint32_t statstype;
	void *context;
};

static STAILQ_HEAD(, psmi_stats_type) psmi_stats =
STAILQ_HEAD_INITIALIZER(psmi_stats);

psm2_error_t
psmi_stats_register_type(const char *heading,
			 uint32_t statstype,
			 const struct psmi_stats_entry *entries_i,
			 int num_entries, void *context)
{
	struct psmi_stats_entry *entries;
	struct psmi_stats_type *type;
	int i;
	psm2_error_t err = PSM2_OK;

	entries =
	    psmi_calloc(PSMI_EP_NONE, STATS, num_entries,
			sizeof(struct psmi_stats_entry));
	type =
	    psmi_calloc(PSMI_EP_NONE, STATS, 1, sizeof(struct psmi_stats_type));
	PSMI_CHECKMEM(err, entries);
	PSMI_CHECKMEM(err, type);

	type->entries = entries;
	type->num_entries = num_entries;
	type->statstype = statstype;
	type->context = context;
	type->heading = (char *)heading;

	for (i = 0; i < num_entries; i++) {
		type->entries[i].desc = entries_i[i].desc;
		type->entries[i].flags = entries_i[i].flags;
		type->entries[i].getfn = entries_i[i].getfn;
		type->entries[i].u.val = entries_i[i].u.val;
	}

	STAILQ_INSERT_TAIL(&psmi_stats, type, next);
	return err;

fail:
	if (entries)
		psmi_free(entries);
	if (type)
		psmi_free(type);
	return err;
}

psm2_error_t psmi_stats_deregister_all(void)
{
	struct psmi_stats_type *type;

	/* Currently our mpi still reads stats after finalize so this isn't safe
	 * yet */
	while ((type = STAILQ_FIRST(&psmi_stats)) != NULL) {
		STAILQ_REMOVE_HEAD(&psmi_stats, next);
		psmi_free(type->entries);
		psmi_free(type);
	}

	return PSM2_OK;
}

static uint32_t typestring_to_type(const char *typestr)
{
	if (strncasecmp(typestr, "all", 4) == 0)
		return PSMI_STATSTYPE_ALL;
	else if (strncasecmp(typestr, "p2p", 4) == 0)
		return PSMI_STATSTYPE_P2P;
	else if (strncasecmp(typestr, "hfi", 6) == 0)
		return PSMI_STATSTYPE_HFI;
	else if (strncasecmp(typestr, "ips", 4) == 0)
		return PSMI_STATSTYPE_IPSPROTO;
	else if ((strncasecmp(typestr, "intr", 5) == 0) ||
		 (strncasecmp(typestr, "thread", 7) == 0) ||
		 (strncasecmp(typestr, "rcvthread", 10) == 0))
		return PSMI_STATSTYPE_RCVTHREAD;
	else if ((strncasecmp(typestr, "mq", 3) == 0) ||
		 (strncasecmp(typestr, "mpi", 4) == 0))
		return PSMI_STATSTYPE_MQ;
	else if ((strncasecmp(typestr, "tid", 4) == 0) ||
		 (strncasecmp(typestr, "tids", 5) == 0))
		return PSMI_STATSTYPE_TIDS;
	else if ((strncasecmp(typestr, "counter", 8) == 0) ||
		 (strncasecmp(typestr, "counters", 9) == 0))
		return PSMI_STATSTYPE_DEVCOUNTERS;
	else if (strncasecmp(typestr, "devstats", 9) == 0)
		return PSMI_STATSTYPE_DEVSTATS;
	else if ((strncasecmp(typestr, "memory", 7) == 0) ||
		 (strncasecmp(typestr, "alloc", 6) == 0) ||
		 (strncasecmp(typestr, "malloc", 7) == 0))
		return PSMI_STATSTYPE_MEMORY;
	else
		return 0;
}

static uint32_t stats_parse_enabled_mask(const char *stats_string)
{
	char *b = (char *)stats_string;
	char *e = b;
	char buf[128];

	uint32_t stats_enabled_mask = 0;

	while (*e) {
		b = e;
		while (*e && *e != ',' && *e != '+' && *e != '.' &&
		       *e != '|' && *e != ':')
			e++;
		if (e > b) {	/* something new to parse */
			int len = ((e - b) > (sizeof(buf) - 1)) ?
			    (sizeof(buf) - 1) : (e - b);
			strncpy(buf, b, len);
			buf[len] = '\0';
			stats_enabled_mask |= typestring_to_type(buf);
		}
		if (*e)
			e++;	/* skip delimiter */
	}
	return stats_enabled_mask;
}

static
void psmi_stats_mpspawn_callback(struct mpspawn_stats_req_args *args)
{
	const struct psmi_stats_entry *entry;
	struct psmi_stats_type *type = (struct psmi_stats_type *)args->context;
	int i, num = args->num;
	uint64_t *stats = args->stats;
	uint64_t *c = NULL;
	uint64_t *s = NULL;

	psmi_assert(num == type->num_entries);

	if (type->statstype == PSMI_STATSTYPE_DEVCOUNTERS ||
	    type->statstype == PSMI_STATSTYPE_DEVSTATS) {
		int unit_id = ((psm2_ep_t) type->context)->unit_id;
		int portno = ((psm2_ep_t) type->context)->portnum;
		uintptr_t off;
		uint8_t *p = NULL;
		int nc, npc, ns;
		int nstats = hfi_get_stats_names_count();
		int nctrs = hfi_get_ctrs_unit_names_count(unit_id);
		int npctrs = hfi_get_ctrs_port_names_count(unit_id);

		if (nctrs != -1 && npctrs != -1)
			c = psmi_calloc(PSMI_EP_NONE, STATS, nctrs + npctrs,
					sizeof(uint64_t));
		if (nstats != -1)
			s = psmi_calloc(PSMI_EP_NONE, STATS, nstats,
					sizeof(uint64_t));

		/*
		 * If hfifs is not loaded, we set NAN everywhere.  We don't want
		 * stats to break just because 1 node didn't have hfi-stats
		 */
		if (type->statstype == PSMI_STATSTYPE_DEVCOUNTERS && c != NULL) {
			nc = hfi_get_ctrs_unit(unit_id, c, nctrs);
			if (nc != -1 && nc == nctrs)
				p = (uint8_t *) c;
			if (nc == -1)
				nc = 0;
			npc =
			    hfi_get_ctrs_port(unit_id, portno, c + nc, npctrs);
			if (!p && npc > 0 && npc == npctrs)
				p = (uint8_t *) c;
		} else if (s != NULL) {
			ns = hfi_get_stats(s, nstats);
			if (ns != -1)
				p = (uint8_t *) s;
		}
		for (i = 0; i < num; i++) {
			entry = &type->entries[i];
			if (p) {
				off = (uintptr_t) entry->u.off;
				stats[i] = *((uint64_t *) (p + off));
			} else
				stats[i] = MPSPAWN_NAN_U64;
		}
	} else if (type->statstype == PSMI_STATSTYPE_MEMORY) {
		for (i = 0; i < num; i++) {
			entry = &type->entries[i];
			stats[i] =
			    *(uint64_t *) ((uintptr_t) &psmi_stats_memory +
					   (uintptr_t) entry->u.off);
		}
	} else {
		for (i = 0; i < num; i++) {
			entry = &type->entries[i];
			if (entry->getfn != NULL)
				stats[i] = entry->getfn(type->context);
			else
				stats[i] = *entry->u.val;
		}
	}

	if (c != NULL)
		psmi_free(c);
	if (s != NULL)
		psmi_free(s);
}

static
void
stats_register_mpspawn_single(mpspawn_stats_add_fn add_fn,
			      char *heading,
			      int num_entries,
			      struct psmi_stats_entry *entries,
			      mpspawn_stats_req_fn req_fn, void *context)
{
	int i;
	struct mpspawn_stats_add_args mp_add;

	mp_add.version = MPSPAWN_STATS_VERSION;
	mp_add.num = num_entries;
	mp_add.header = heading;
	mp_add.req_fn = req_fn;
	mp_add.context = context;

	mp_add.desc = (char **)alloca(sizeof(char *) * num_entries);

	mp_add.flags = (uint16_t *) alloca(sizeof(uint16_t *) * num_entries);

	for (i = 0; i < num_entries; i++) {
		mp_add.desc[i] = (char *)entries[i].desc;
		mp_add.flags[i] = entries[i].flags;
	}

	/* Ignore return code, doesn't matter to *us* if register failed */
	add_fn(&mp_add);

	return;
}

static void stats_register_hfi_counters(psm2_ep_t ep);
static void stats_register_hfi_stats(psm2_ep_t ep);
static void stats_register_mem_stats(psm2_ep_t ep);
static psm2_error_t psmi_stats_epaddr_register(struct mpspawn_stats_init_args
					      *args);

/*
 * Downcall from QLogic MPI into PSM, so we can register stats
 */
void *psmi_stats_register(struct mpspawn_stats_init_args *args)
{
	struct psmi_stats_type *type;
	uint32_t statsmask;

	/*
	 * Args has a version string in it, but we can ignore it since mpspawn
	 * will decide if it supports *our* version
	 */

	/*
	 * Eventually, parse the stats_types to add various "flavours" of stats
	 */
	if (args->stats_types == NULL)
		return NULL;

	statsmask = stats_parse_enabled_mask(args->stats_types);

	/* MQ (MPI-level) statistics */
	if (statsmask & PSMI_STATSTYPE_MQ)
		psmi_mq_stats_register(args->mq, args->add_fn);

	/* PSM and hfi level statistics */
	if (statsmask & PSMI_STATSTYPE_DEVCOUNTERS)
		stats_register_hfi_counters(args->mq->ep);

	if (statsmask & PSMI_STATSTYPE_DEVSTATS)
		stats_register_hfi_stats(args->mq->ep);

	if (statsmask & PSMI_STATSTYPE_MEMORY)
		stats_register_mem_stats(args->mq->ep);

	/*
	 * At this point all PSM and hfi-level components have registered stats
	 * with the PSM stats interface.  We register with the mpspawn stats
	 * interface with an upcall in add_fn
	 */
	STAILQ_FOREACH(type, &psmi_stats, next) {
		if (type->statstype & statsmask)
			stats_register_mpspawn_single(args->add_fn,
						      type->heading,
						      type->num_entries,
						      type->entries,
						      psmi_stats_mpspawn_callback,
						      type);
	}

	/*
	 * Special handling for per-endpoint statistics
	 * Only MPI knows what the endpoint-addresses are in the running program,
	 * PSM has no sense of MPI worlds.  In stats register, MPI tells PSM how
	 * many endpoints it anticipates having and PSM simply reserves that amount
	 * of stats entries X the amount of per-endpoint stats.
	 */
	if (statsmask & PSMI_STATSTYPE_P2P)
		psmi_stats_epaddr_register(args);

	return NULL;
}

struct stats_epaddr {
	psm2_ep_t ep;
	mpspawn_map_epaddr_fn epaddr_map_fn;
	int num_ep;
	int num_ep_stats;
};

static
void psmi_stats_epaddr_callback(struct mpspawn_stats_req_args *args)
{
	int i, num, off;
	uint64_t *statsp;
	struct stats_epaddr *stats_ctx = (struct stats_epaddr *)args->context;
	psm2_ep_t ep = stats_ctx->ep;
	psm2_epaddr_t epaddr;

	num = stats_ctx->num_ep * stats_ctx->num_ep_stats;

	/* First always NAN the entire stats request */
	for (i = 0; i < num; i++) {
		if (args->flags[i] & MPSPAWN_STATS_TYPE_DOUBLE)
			args->stats[i] = MPSPAWN_NAN;
		else
			args->stats[i] = MPSPAWN_NAN_U64;
	}

	for (i = 0; i < stats_ctx->num_ep; i++) {
		statsp = args->stats + i * stats_ctx->num_ep_stats;
		off = 0;
		epaddr = stats_ctx->epaddr_map_fn(i);
		if (epaddr == NULL)
			continue;

		/* Self */
		if (&ep->ptl_self == epaddr->ptlctl) {
			if (ep->ptl_self.epaddr_stats_get != NULL)
				off +=
				    ep->ptl_self.epaddr_stats_get(epaddr,
								  statsp + off);
		} else {
			if (ep->ptl_self.epaddr_stats_num != NULL)
				off += ep->ptl_self.epaddr_stats_num();
		}

		/* Shm */
		if (&ep->ptl_amsh == epaddr->ptlctl) {
			if (ep->ptl_amsh.epaddr_stats_get != NULL)
				off +=
				    ep->ptl_amsh.epaddr_stats_get(epaddr,
								  statsp + off);
		} else {
			if (ep->ptl_amsh.epaddr_stats_num != NULL)
				off += ep->ptl_amsh.epaddr_stats_num();
		}

		/* ips */
		if (&ep->ptl_ips == epaddr->ptlctl) {
			if (ep->ptl_ips.epaddr_stats_get != NULL)
				off +=
				    ep->ptl_ips.epaddr_stats_get(epaddr,
								 statsp + off);
		} else {
			if (ep->ptl_ips.epaddr_stats_num != NULL)
				off += ep->ptl_ips.epaddr_stats_num();
		}
	}
	return;
}

static
psm2_error_t
psmi_stats_epaddr_register(struct mpspawn_stats_init_args *args)
{
	int i = 0, j;
	int num_ep = args->num_epaddr;
	int num_ep_stats = 0;
	int nz;
	char **desc, **desc_i;
	uint16_t *flags, *flags_i;
	char *p;
	char buf[128];
	psm2_ep_t ep;
	struct mpspawn_stats_add_args mp_add;
	struct stats_epaddr *stats_ctx;
	psm2_error_t err = PSM2_OK;

	if (args->mq == NULL)
		return PSM2_OK;
	ep = args->mq->ep;

	/* Figure out how many stats there are in an endpoint from all devices */
	if (ep->ptl_self.epaddr_stats_num != NULL)
		num_ep_stats += ep->ptl_self.epaddr_stats_num();
	if (ep->ptl_amsh.epaddr_stats_num != NULL)
		num_ep_stats += ep->ptl_amsh.epaddr_stats_num();
	if (ep->ptl_ips.epaddr_stats_num != NULL)
		num_ep_stats += ep->ptl_ips.epaddr_stats_num();

	/* Allocate desc and flags and let each device initialize their
	 * descriptions and flags */
	desc =
	    psmi_malloc(ep, STATS,
			sizeof(char *) * num_ep_stats * (num_ep + 1));
	if (desc == NULL)
		return PSM2_NO_MEMORY;
	flags =
	    psmi_malloc(ep, STATS,
			sizeof(uint16_t) * num_ep_stats * (num_ep + 1));
	if (flags == NULL) {
		psmi_free(desc);
		return PSM2_NO_MEMORY;
	}

	/* Get the descriptions/flags from each device */
	i = 0;
	i += ep->ptl_self.epaddr_stats_num != NULL ?
	    ep->ptl_self.epaddr_stats_init(desc + i, flags + i) : 0;
	i += ep->ptl_amsh.epaddr_stats_num != NULL ?
	    ep->ptl_amsh.epaddr_stats_init(desc + i, flags + i) : 0;
	i += ep->ptl_ips.epaddr_stats_num != NULL ?
	    ep->ptl_ips.epaddr_stats_init(desc + i, flags + i) : 0;
	psmi_assert_always(i == num_ep_stats);

	/*
	 * Clone the descriptions for each endpoint but append "rank %d" to it
	 * beforehand.
	 */
	nz = (num_ep < 10 ? 1 : (num_ep < 100 ? 2 :	/* cheap log */
				 (num_ep < 1000 ? 3 : (num_ep < 1000 ? 4 :
						       (num_ep <
							10000 ? 5 : 6)))));

	desc_i = desc + num_ep_stats;
	flags_i = flags + num_ep_stats;
	memset(desc_i, 0, sizeof(char *) * num_ep * num_ep_stats);

	for (i = 0; i < num_ep; i++) {
		for (j = 0; j < num_ep_stats; j++) {
			snprintf(buf, sizeof(buf) - 1, "<%*d> %s", nz, i,
				 desc[j]);
			buf[sizeof(buf) - 1] = '\0';
			p = psmi_strdup(ep, buf);
			if (p == NULL) {
				err = PSM2_NO_MEMORY;
				goto clean;
			}
			desc_i[i * num_ep_stats + j] = p;
			flags_i[i * num_ep_stats + j] = flags[j];
		}
	}

	mp_add.version = MPSPAWN_STATS_VERSION;
	mp_add.num = num_ep_stats * num_ep;
	mp_add.header = "Endpoint-to-Endpoint Stats (by <rank>)";
	mp_add.req_fn = psmi_stats_epaddr_callback;
	mp_add.desc = desc_i;
	mp_add.flags = flags_i;
	stats_ctx = psmi_malloc(ep, STATS, sizeof(struct stats_epaddr));
	if (stats_ctx == NULL) {
		err = PSM2_NO_MEMORY;
		goto clean;
	}
	stats_ctx->ep = ep;
	stats_ctx->epaddr_map_fn = args->epaddr_map_fn;
	stats_ctx->num_ep = num_ep;
	stats_ctx->num_ep_stats = num_ep_stats;
	mp_add.context = stats_ctx;

	args->add_fn(&mp_add);

clean:
	/* Now we can free all the descriptions */
	for (i = 0; i < num_ep; i++) {
		for (j = 0; j < num_ep_stats; j++)
			if (desc_i[i * num_ep_stats + j])
				psmi_free(desc_i[i * num_ep_stats + j]);
	}

	psmi_free(desc);
	psmi_free(flags);

	return err;
}

static
void stats_register_hfi_counters(psm2_ep_t ep)
{
	int i, nc, npc;
	char *cnames = NULL, *pcnames = NULL;
	struct psmi_stats_entry *entries = NULL;

	nc = hfi_get_ctrs_unit_names(ep->unit_id, &cnames);
	if (nc == -1 || cnames == NULL)
		goto bail;
	npc = hfi_get_ctrs_port_names(ep->unit_id, &pcnames);
	if (npc == -1 || pcnames == NULL)
		goto bail;
	entries =
	    psmi_calloc(ep, STATS, nc + npc, sizeof(struct psmi_stats_entry));
	if (entries == NULL)
		goto bail;

	for (i = 0; i < nc; i++) {
		entries[i].desc = hfi_get_next_name(&cnames);
		entries[i].flags = MPSPAWN_STATS_REDUCTION_ALL |
		    MPSPAWN_STATS_SKIP_IF_ZERO;
		entries[i].getfn = NULL;
		entries[i].u.off = i * sizeof(uint64_t);
	}
	for (i = nc; i < nc + npc; i++) {
		entries[i].desc = hfi_get_next_name(&pcnames);
		entries[i].flags = MPSPAWN_STATS_REDUCTION_ALL |
		    MPSPAWN_STATS_SKIP_IF_ZERO;
		entries[i].getfn = NULL;
		entries[i].u.off = i * sizeof(uint64_t);
	}
	psmi_stats_register_type("OPA device counters",
				 PSMI_STATSTYPE_DEVCOUNTERS,
				 entries, nc + npc, ep);
	return;

bail:
	if (cnames != NULL)
		hfi_release_names(cnames);
	if (pcnames != NULL)
		hfi_release_names(pcnames);
	if (entries != NULL)
		psmi_free(entries);
}

static
void stats_register_hfi_stats(psm2_ep_t ep)
{
	int i, ns;
	char *snames = NULL;
	struct psmi_stats_entry *entries = NULL;

	ns = hfi_get_stats_names(&snames);
	if (ns == -1 || snames == NULL)
		goto bail;
	entries = psmi_calloc(ep, STATS, ns, sizeof(struct psmi_stats_entry));
	if (entries == NULL)
		goto bail;

	for (i = 0; i < ns; i++) {
		entries[i].desc = hfi_get_next_name(&snames);
		entries[i].flags = MPSPAWN_STATS_REDUCTION_ALL |
		    MPSPAWN_STATS_SKIP_IF_ZERO;
		entries[i].getfn = NULL;
		entries[i].u.off = i * sizeof(uint64_t);
	}
	psmi_stats_register_type("OPA device statistics",
				 PSMI_STATSTYPE_DEVSTATS, entries, ns, ep);
	return;

bail:
	if (snames != NULL)
		hfi_release_names(snames);
	if (entries != NULL)
		psmi_free(entries);
}

#undef _SDECL
#define _SDECL(_desc, _param) {					\
	    .desc  = _desc,					\
	    .flags = MPSPAWN_STATS_REDUCTION_ALL		\
		     | MPSPAWN_STATS_SKIP_IF_ZERO,		\
	    .getfn = NULL,					\
	    .u.off = offsetof(struct psmi_stats_malloc, _param)	\
	}

static
void stats_register_mem_stats(psm2_ep_t ep)
{
	struct psmi_stats_entry entries[] = {
		_SDECL("Total (current)", m_all_total),
		_SDECL("Total (max)", m_all_max),
		_SDECL("All Peers (current)", m_perpeer_total),
		_SDECL("All Peers (max)", m_perpeer_max),
		_SDECL("Network Buffers (current)", m_netbufs_total),
		_SDECL("Network Buffers (max)", m_netbufs_max),
		_SDECL("PSM desctors (current)", m_descriptors_total),
		_SDECL("PSM desctors (max)", m_descriptors_max),
		_SDECL("Unexp. buffers (current)", m_unexpbufs_total),
		_SDECL("Unexp. Buffers (max)", m_unexpbufs_max),
		_SDECL("Other (current)", m_undefined_total),
		_SDECL("Other (max)", m_undefined_max),
	};

	psmi_stats_register_type("PSM memory allocation statistics",
				 PSMI_STATSTYPE_MEMORY,
				 entries, PSMI_STATS_HOWMANY(entries), ep);
}