/*
 * GPL HEADER START
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 only,
 * 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 version 2 for more details (a copy is included
 * in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU General Public License
 * version 2 along with this program; If not, see
 * http://www.gnu.org/licenses/gpl-2.0.html
 *
 * GPL HEADER END
 */
/*
 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright (c) 2012, Intel Corporation.
 */
/*
 * This file is part of Lustre, http://www.lustre.org/
 * Lustre is a trademark of Sun Microsystems, Inc.
 *
 * lnet/selftest/selftest.h
 *
 * Author: Isaac Huang <isaac@clusterfs.com>
 */
#ifndef __SELFTEST_SELFTEST_H__
#define __SELFTEST_SELFTEST_H__

#define LNET_ONLY

#include <linux/libcfs/libcfs.h>
#include <linux/lnet/lib-lnet.h>
#include <linux/lnet/lib-types.h>
#include <uapi/linux/lnet/lnetst.h>

#include "rpc.h"
#include "timer.h"

#ifndef MADE_WITHOUT_COMPROMISE
#define MADE_WITHOUT_COMPROMISE
#endif

#define SWI_STATE_NEWBORN		0
#define SWI_STATE_REPLY_SUBMITTED	1
#define SWI_STATE_REPLY_SENT		2
#define SWI_STATE_REQUEST_SUBMITTED	3
#define SWI_STATE_REQUEST_SENT		4
#define SWI_STATE_REPLY_RECEIVED	5
#define SWI_STATE_BULK_STARTED		6
#define SWI_STATE_DONE			10

/* forward refs */
struct srpc_service;
struct srpc_service_cd;
struct sfw_test_unit;
struct sfw_test_instance;

/* services below SRPC_FRAMEWORK_SERVICE_MAX_ID are framework
 * services, e.g. create/modify session.
 */
#define SRPC_SERVICE_DEBUG		0
#define SRPC_SERVICE_MAKE_SESSION	1
#define SRPC_SERVICE_REMOVE_SESSION	2
#define SRPC_SERVICE_BATCH		3
#define SRPC_SERVICE_TEST		4
#define SRPC_SERVICE_QUERY_STAT		5
#define SRPC_SERVICE_JOIN		6
#define SRPC_FRAMEWORK_SERVICE_MAX_ID	10
/* other services start from SRPC_FRAMEWORK_SERVICE_MAX_ID+1 */
#define SRPC_SERVICE_BRW		11
#define SRPC_SERVICE_PING		12
#define SRPC_SERVICE_MAX_ID		12

#define SRPC_REQUEST_PORTAL		50
/* a lazy portal for framework RPC requests */
#define SRPC_FRAMEWORK_REQUEST_PORTAL	51
/* all reply/bulk RDMAs go to this portal */
#define SRPC_RDMA_PORTAL		52

static inline enum srpc_msg_type
srpc_service2request(int service)
{
	switch (service) {
	default:
		LBUG();
	case SRPC_SERVICE_DEBUG:
		return SRPC_MSG_DEBUG_REQST;

	case SRPC_SERVICE_MAKE_SESSION:
		return SRPC_MSG_MKSN_REQST;

	case SRPC_SERVICE_REMOVE_SESSION:
		return SRPC_MSG_RMSN_REQST;

	case SRPC_SERVICE_BATCH:
		return SRPC_MSG_BATCH_REQST;

	case SRPC_SERVICE_TEST:
		return SRPC_MSG_TEST_REQST;

	case SRPC_SERVICE_QUERY_STAT:
		return SRPC_MSG_STAT_REQST;

	case SRPC_SERVICE_BRW:
		return SRPC_MSG_BRW_REQST;

	case SRPC_SERVICE_PING:
		return SRPC_MSG_PING_REQST;

	case SRPC_SERVICE_JOIN:
		return SRPC_MSG_JOIN_REQST;
	}
}

static inline enum srpc_msg_type
srpc_service2reply(int service)
{
	return srpc_service2request(service) + 1;
}

enum srpc_event_type {
	SRPC_BULK_REQ_RCVD   = 1, /* passive bulk request(PUT sink/GET source)
				   * received
				   */
	SRPC_BULK_PUT_SENT   = 2, /* active bulk PUT sent (source) */
	SRPC_BULK_GET_RPLD   = 3, /* active bulk GET replied (sink) */
	SRPC_REPLY_RCVD      = 4, /* incoming reply received */
	SRPC_REPLY_SENT      = 5, /* outgoing reply sent */
	SRPC_REQUEST_RCVD    = 6, /* incoming request received */
	SRPC_REQUEST_SENT    = 7, /* outgoing request sent */
};

/* RPC event */
struct srpc_event {
	enum srpc_event_type	ev_type;	/* what's up */
	enum lnet_event_kind	ev_lnet;	/* LNet event type */
	int		  ev_fired;  /* LNet event fired? */
	int		  ev_status; /* LNet event status */
	void		  *ev_data;  /* owning server/client RPC */
};

/* bulk descriptor */
struct srpc_bulk {
	int		 bk_len;     /* len of bulk data */
	struct lnet_handle_md	bk_mdh;
	int		 bk_sink;    /* sink/source */
	int		 bk_niov;    /* # iov in bk_iovs */
	struct bio_vec		bk_iovs[0];
};

/* message buffer descriptor */
struct srpc_buffer {
	struct list_head  buf_list; /* chain on srpc_service::*_msgq */
	struct srpc_msg	  buf_msg;
	struct lnet_handle_md	buf_mdh;
	lnet_nid_t	  buf_self;
	struct lnet_process_id	buf_peer;
};

struct swi_workitem;
typedef int (*swi_action_t) (struct swi_workitem *);

struct swi_workitem {
	struct cfs_wi_sched *swi_sched;
	struct cfs_workitem swi_workitem;
	swi_action_t	    swi_action;
	int		    swi_state;
};

/* server-side state of a RPC */
struct srpc_server_rpc {
	/* chain on srpc_service::*_rpcq */
	struct list_head       srpc_list;
	struct srpc_service_cd *srpc_scd;
	struct swi_workitem	srpc_wi;
	struct srpc_event	srpc_ev;	/* bulk/reply event */
	lnet_nid_t	       srpc_self;
	struct lnet_process_id	srpc_peer;
	struct srpc_msg		srpc_replymsg;
	struct lnet_handle_md	srpc_replymdh;
	struct srpc_buffer	*srpc_reqstbuf;
	struct srpc_bulk	*srpc_bulk;

	unsigned int	       srpc_aborted; /* being given up */
	int		       srpc_status;
	void		       (*srpc_done)(struct srpc_server_rpc *);
};

/* client-side state of a RPC */
struct srpc_client_rpc {
	struct list_head  crpc_list;	  /* chain on user's lists */
	spinlock_t	  crpc_lock;	  /* serialize */
	int		  crpc_service;
	atomic_t	  crpc_refcount;
	int		  crpc_timeout;   /* # seconds to wait for reply */
	struct stt_timer       crpc_timer;
	struct swi_workitem	crpc_wi;
	struct lnet_process_id	crpc_dest;

	void		  (*crpc_done)(struct srpc_client_rpc *);
	void		  (*crpc_fini)(struct srpc_client_rpc *);
	int		  crpc_status;	  /* completion status */
	void		  *crpc_priv;	  /* caller data */

	/* state flags */
	unsigned int	  crpc_aborted:1; /* being given up */
	unsigned int	  crpc_closed:1;  /* completed */

	/* RPC events */
	struct srpc_event	crpc_bulkev;	/* bulk event */
	struct srpc_event	crpc_reqstev;	/* request event */
	struct srpc_event	crpc_replyev;	/* reply event */

	/* bulk, request(reqst), and reply exchanged on wire */
	struct srpc_msg		crpc_reqstmsg;
	struct srpc_msg		crpc_replymsg;
	struct lnet_handle_md	crpc_reqstmdh;
	struct lnet_handle_md	crpc_replymdh;
	struct srpc_bulk	crpc_bulk;
};

#define srpc_client_rpc_size(rpc)					\
offsetof(struct srpc_client_rpc, crpc_bulk.bk_iovs[(rpc)->crpc_bulk.bk_niov])

#define srpc_client_rpc_addref(rpc)					\
do {									\
	CDEBUG(D_NET, "RPC[%p] -> %s (%d)++\n",				\
	       (rpc), libcfs_id2str((rpc)->crpc_dest),			\
	       atomic_read(&(rpc)->crpc_refcount));			\
	LASSERT(atomic_read(&(rpc)->crpc_refcount) > 0);		\
	atomic_inc(&(rpc)->crpc_refcount);				\
} while (0)

#define srpc_client_rpc_decref(rpc)					\
do {									\
	CDEBUG(D_NET, "RPC[%p] -> %s (%d)--\n",				\
	       (rpc), libcfs_id2str((rpc)->crpc_dest),			\
	       atomic_read(&(rpc)->crpc_refcount));			\
	LASSERT(atomic_read(&(rpc)->crpc_refcount) > 0);		\
	if (atomic_dec_and_test(&(rpc)->crpc_refcount))			\
		srpc_destroy_client_rpc(rpc);				\
} while (0)

#define srpc_event_pending(rpc)   (!(rpc)->crpc_bulkev.ev_fired ||	\
				   !(rpc)->crpc_reqstev.ev_fired ||	\
				   !(rpc)->crpc_replyev.ev_fired)

/* CPU partition data of srpc service */
struct srpc_service_cd {
	/** serialize */
	spinlock_t		scd_lock;
	/** backref to service */
	struct srpc_service	*scd_svc;
	/** event buffer */
	struct srpc_event	scd_ev;
	/** free RPC descriptors */
	struct list_head	scd_rpc_free;
	/** in-flight RPCs */
	struct list_head	scd_rpc_active;
	/** workitem for posting buffer */
	struct swi_workitem	scd_buf_wi;
	/** CPT id */
	int			scd_cpt;
	/** error code for scd_buf_wi */
	int			scd_buf_err;
	/** timestamp for scd_buf_err */
	time64_t		scd_buf_err_stamp;
	/** total # request buffers */
	int			scd_buf_total;
	/** # posted request buffers */
	int			scd_buf_nposted;
	/** in progress of buffer posting */
	int			scd_buf_posting;
	/** allocate more buffers if scd_buf_nposted < scd_buf_low */
	int			scd_buf_low;
	/** increase/decrease some buffers */
	int			scd_buf_adjust;
	/** posted message buffers */
	struct list_head	scd_buf_posted;
	/** blocked for RPC descriptor */
	struct list_head	scd_buf_blocked;
};

/* number of server workitems (mini-thread) for testing service */
#define SFW_TEST_WI_MIN		256
#define SFW_TEST_WI_MAX		2048
/* extra buffers for tolerating buggy peers, or unbalanced number
 * of peers between partitions
 */
#define SFW_TEST_WI_EXTRA	64

/* number of server workitems (mini-thread) for framework service */
#define SFW_FRWK_WI_MIN		16
#define SFW_FRWK_WI_MAX		256

struct srpc_service {
	int			sv_id;		/* service id */
	const char		*sv_name;	/* human readable name */
	int			sv_wi_total;	/* total server workitems */
	int			sv_shuttingdown;
	int			sv_ncpts;
	/* percpt data for srpc_service */
	struct srpc_service_cd	**sv_cpt_data;
	/* Service callbacks:
	 * - sv_handler: process incoming RPC request
	 * - sv_bulk_ready: notify bulk data
	 */
	int (*sv_handler)(struct srpc_server_rpc *);
	int (*sv_bulk_ready)(struct srpc_server_rpc *, int);
};

struct sfw_session {
	struct list_head sn_list;    /* chain on fw_zombie_sessions */
	struct lst_sid	 sn_id;      /* unique identifier */
	unsigned int	 sn_timeout; /* # seconds' inactivity to expire */
	int		 sn_timer_active;
	unsigned int	 sn_features;
	struct stt_timer      sn_timer;
	struct list_head sn_batches; /* list of batches */
	char		 sn_name[LST_NAME_SIZE];
	atomic_t	 sn_refcount;
	atomic_t	 sn_brw_errors;
	atomic_t	 sn_ping_errors;
	unsigned long	 sn_started;
};

#define sfw_sid_equal(sid0, sid1)     ((sid0).ses_nid == (sid1).ses_nid && \
				       (sid0).ses_stamp == (sid1).ses_stamp)

struct sfw_batch {
	struct list_head bat_list;	/* chain on sn_batches */
	struct lst_bid	 bat_id;	/* batch id */
	int		 bat_error;	/* error code of batch */
	struct sfw_session	*bat_session;	/* batch's session */
	atomic_t	 bat_nactive;	/* # of active tests */
	struct list_head bat_tests;	/* test instances */
};

struct sfw_test_client_ops {
	int  (*tso_init)(struct sfw_test_instance *tsi); /* initialize test
							  * client
							  */
	void (*tso_fini)(struct sfw_test_instance *tsi); /* finalize test
							  * client
							  */
	int  (*tso_prep_rpc)(struct sfw_test_unit *tsu,
			     struct lnet_process_id dest,
			     struct srpc_client_rpc **rpc);	/* prep a tests rpc */
	void (*tso_done_rpc)(struct sfw_test_unit *tsu,
			     struct srpc_client_rpc *rpc);	/* done a test rpc */
};

struct sfw_test_instance {
	struct list_head	   tsi_list;		/* chain on batch */
	int			   tsi_service;		/* test type */
	struct sfw_batch		*tsi_batch;	/* batch */
	struct sfw_test_client_ops	*tsi_ops;	/* test client operation
							 */

	/* public parameter for all test units */
	unsigned int		   tsi_is_client:1;	/* is test client */
	unsigned int		   tsi_stoptsu_onerr:1; /* stop tsu on error */
	int			   tsi_concur;		/* concurrency */
	int			   tsi_loop;		/* loop count */

	/* status of test instance */
	spinlock_t		   tsi_lock;		/* serialize */
	unsigned int		   tsi_stopping:1;	/* test is stopping */
	atomic_t		   tsi_nactive;		/* # of active test
							 * unit
							 */
	struct list_head	   tsi_units;		/* test units */
	struct list_head	   tsi_free_rpcs;	/* free rpcs */
	struct list_head	   tsi_active_rpcs;	/* active rpcs */

	union {
		struct test_ping_req	ping;		/* ping parameter */
		struct test_bulk_req	bulk_v0;	/* bulk parameter */
		struct test_bulk_req_v1	bulk_v1;	/* bulk v1 parameter */
	} tsi_u;
};

/*
 * XXX: trailing (PAGE_SIZE % sizeof(struct lnet_process_id)) bytes at the end
 * of pages are not used
 */
#define SFW_MAX_CONCUR	   LST_MAX_CONCUR
#define SFW_ID_PER_PAGE    (PAGE_SIZE / sizeof(struct lnet_process_id_packed))
#define SFW_MAX_NDESTS	   (LNET_MAX_IOV * SFW_ID_PER_PAGE)
#define sfw_id_pages(n)    (((n) + SFW_ID_PER_PAGE - 1) / SFW_ID_PER_PAGE)

struct sfw_test_unit {
	struct list_head    tsu_list;	   /* chain on lst_test_instance */
	struct lnet_process_id		tsu_dest;	/* id of dest node */
	int		    tsu_loop;	   /* loop count of the test */
	struct sfw_test_instance	*tsu_instance; /* pointer to test instance */
	void		    *tsu_private;  /* private data */
	struct swi_workitem	tsu_worker;	/* workitem of the test unit */
};

struct sfw_test_case {
	struct list_head      tsc_list;		/* chain on fw_tests */
	struct srpc_service		*tsc_srv_service;	/* test service */
	struct sfw_test_client_ops	*tsc_cli_ops;	/* ops of test client */
};

struct srpc_client_rpc *
sfw_create_rpc(struct lnet_process_id peer, int service,
	       unsigned int features, int nbulkiov, int bulklen,
	       void (*done)(struct srpc_client_rpc *), void *priv);
int sfw_create_test_rpc(struct sfw_test_unit *tsu,
			struct lnet_process_id peer, unsigned int features,
			int nblk, int blklen, struct srpc_client_rpc **rpc);
void sfw_abort_rpc(struct srpc_client_rpc *rpc);
void sfw_post_rpc(struct srpc_client_rpc *rpc);
void sfw_client_rpc_done(struct srpc_client_rpc *rpc);
void sfw_unpack_message(struct srpc_msg *msg);
void sfw_free_pages(struct srpc_server_rpc *rpc);
void sfw_add_bulk_page(struct srpc_bulk *bk, struct page *pg, int i);
int sfw_alloc_pages(struct srpc_server_rpc *rpc, int cpt, int npages, int len,
		    int sink);
int sfw_make_session(struct srpc_mksn_reqst *request,
		     struct srpc_mksn_reply *reply);

struct srpc_client_rpc *
srpc_create_client_rpc(struct lnet_process_id peer, int service,
		       int nbulkiov, int bulklen,
		       void (*rpc_done)(struct srpc_client_rpc *),
		       void (*rpc_fini)(struct srpc_client_rpc *), void *priv);
void srpc_post_rpc(struct srpc_client_rpc *rpc);
void srpc_abort_rpc(struct srpc_client_rpc *rpc, int why);
void srpc_free_bulk(struct srpc_bulk *bk);
struct srpc_bulk *srpc_alloc_bulk(int cpt, unsigned int off,
				  unsigned int bulk_npg, unsigned int bulk_len,
				  int sink);
int srpc_send_rpc(struct swi_workitem *wi);
int srpc_send_reply(struct srpc_server_rpc *rpc);
int srpc_add_service(struct srpc_service *sv);
int srpc_remove_service(struct srpc_service *sv);
void srpc_shutdown_service(struct srpc_service *sv);
void srpc_abort_service(struct srpc_service *sv);
int srpc_finish_service(struct srpc_service *sv);
int srpc_service_add_buffers(struct srpc_service *sv, int nbuffer);
void srpc_service_remove_buffers(struct srpc_service *sv, int nbuffer);
void srpc_get_counters(struct srpc_counters *cnt);
void srpc_set_counters(const struct srpc_counters *cnt);

extern struct cfs_wi_sched *lst_sched_serial;
extern struct cfs_wi_sched **lst_sched_test;

static inline int
srpc_serv_is_framework(struct srpc_service *svc)
{
	return svc->sv_id < SRPC_FRAMEWORK_SERVICE_MAX_ID;
}

static inline int
swi_wi_action(struct cfs_workitem *wi)
{
	struct swi_workitem *swi;

	swi = container_of(wi, struct swi_workitem, swi_workitem);

	return swi->swi_action(swi);
}

static inline void
swi_init_workitem(struct swi_workitem *swi, void *data,
		  swi_action_t action, struct cfs_wi_sched *sched)
{
	swi->swi_sched = sched;
	swi->swi_action = action;
	swi->swi_state = SWI_STATE_NEWBORN;
	cfs_wi_init(&swi->swi_workitem, data, swi_wi_action);
}

static inline void
swi_schedule_workitem(struct swi_workitem *wi)
{
	cfs_wi_schedule(wi->swi_sched, &wi->swi_workitem);
}

static inline void
swi_exit_workitem(struct swi_workitem *swi)
{
	cfs_wi_exit(swi->swi_sched, &swi->swi_workitem);
}

static inline int
swi_deschedule_workitem(struct swi_workitem *swi)
{
	return cfs_wi_deschedule(swi->swi_sched, &swi->swi_workitem);
}

int sfw_startup(void);
int srpc_startup(void);
void sfw_shutdown(void);
void srpc_shutdown(void);

static inline void
srpc_destroy_client_rpc(struct srpc_client_rpc *rpc)
{
	LASSERT(rpc);
	LASSERT(!srpc_event_pending(rpc));
	LASSERT(!atomic_read(&rpc->crpc_refcount));

	if (!rpc->crpc_fini)
		LIBCFS_FREE(rpc, srpc_client_rpc_size(rpc));
	else
		(*rpc->crpc_fini)(rpc);
}

static inline void
srpc_init_client_rpc(struct srpc_client_rpc *rpc, struct lnet_process_id peer,
		     int service, int nbulkiov, int bulklen,
		     void (*rpc_done)(struct srpc_client_rpc *),
		     void (*rpc_fini)(struct srpc_client_rpc *), void *priv)
{
	LASSERT(nbulkiov <= LNET_MAX_IOV);

	memset(rpc, 0, offsetof(struct srpc_client_rpc,
				crpc_bulk.bk_iovs[nbulkiov]));

	INIT_LIST_HEAD(&rpc->crpc_list);
	swi_init_workitem(&rpc->crpc_wi, rpc, srpc_send_rpc,
			  lst_sched_test[lnet_cpt_of_nid(peer.nid)]);
	spin_lock_init(&rpc->crpc_lock);
	atomic_set(&rpc->crpc_refcount, 1); /* 1 ref for caller */

	rpc->crpc_dest = peer;
	rpc->crpc_priv = priv;
	rpc->crpc_service = service;
	rpc->crpc_bulk.bk_len = bulklen;
	rpc->crpc_bulk.bk_niov = nbulkiov;
	rpc->crpc_done = rpc_done;
	rpc->crpc_fini = rpc_fini;
	LNetInvalidateMDHandle(&rpc->crpc_reqstmdh);
	LNetInvalidateMDHandle(&rpc->crpc_replymdh);
	LNetInvalidateMDHandle(&rpc->crpc_bulk.bk_mdh);

	/* no event is expected at this point */
	rpc->crpc_bulkev.ev_fired = 1;
	rpc->crpc_reqstev.ev_fired = 1;
	rpc->crpc_replyev.ev_fired = 1;

	rpc->crpc_reqstmsg.msg_magic = SRPC_MSG_MAGIC;
	rpc->crpc_reqstmsg.msg_version = SRPC_MSG_VERSION;
	rpc->crpc_reqstmsg.msg_type = srpc_service2request(service);
}

static inline const char *
swi_state2str(int state)
{
#define STATE2STR(x) case x: return #x
	switch (state) {
	default:
		LBUG();
	STATE2STR(SWI_STATE_NEWBORN);
	STATE2STR(SWI_STATE_REPLY_SUBMITTED);
	STATE2STR(SWI_STATE_REPLY_SENT);
	STATE2STR(SWI_STATE_REQUEST_SUBMITTED);
	STATE2STR(SWI_STATE_REQUEST_SENT);
	STATE2STR(SWI_STATE_REPLY_RECEIVED);
	STATE2STR(SWI_STATE_BULK_STARTED);
	STATE2STR(SWI_STATE_DONE);
	}
#undef STATE2STR
}

#define selftest_wait_events()					\
	do {							\
		set_current_state(TASK_UNINTERRUPTIBLE);	\
		schedule_timeout(cfs_time_seconds(1) / 10);	\
	} while (0)

#define lst_wait_until(cond, lock, fmt, ...)				\
do {									\
	int __I = 2;							\
	while (!(cond)) {						\
		CDEBUG(is_power_of_2(++__I) ? D_WARNING : D_NET,	\
		       fmt, ## __VA_ARGS__);				\
		spin_unlock(&(lock));					\
									\
		selftest_wait_events();					\
									\
		spin_lock(&(lock));					\
	}								\
} while (0)

static inline void
srpc_wait_service_shutdown(struct srpc_service *sv)
{
	int i = 2;

	LASSERT(sv->sv_shuttingdown);

	while (!srpc_finish_service(sv)) {
		i++;
		CDEBUG(((i & -i) == i) ? D_WARNING : D_NET,
		       "Waiting for %s service to shutdown...\n",
		       sv->sv_name);
		selftest_wait_events();
	}
}

extern struct sfw_test_client_ops brw_test_client;
void brw_init_test_client(void);

extern struct srpc_service brw_test_service;
void brw_init_test_service(void);

extern struct sfw_test_client_ops ping_test_client;
void ping_init_test_client(void);

extern struct srpc_service ping_test_service;
void ping_init_test_service(void);

#endif /* __SELFTEST_SELFTEST_H__ */