/*
 * 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) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright (c) 2012, 2015, Intel Corporation.
 */
/*
 * This file is part of Lustre, http://www.lustre.org/
 * Lustre is a trademark of Seagate, Inc.
 *
 * lnet/include/lnet/lib-types.h
 */

#ifndef __LNET_LIB_TYPES_H__
#define __LNET_LIB_TYPES_H__

#include <linux/kthread.h>
#include <linux/uio.h>
#include <linux/types.h>

#include "types.h"
#include "lnetctl.h"

/* Max payload size */
#define LNET_MAX_PAYLOAD      CONFIG_LNET_MAX_PAYLOAD
#if (LNET_MAX_PAYLOAD < LNET_MTU)
# error "LNET_MAX_PAYLOAD too small - error in configure --with-max-payload-mb"
#elif (LNET_MAX_PAYLOAD > (PAGE_SIZE * LNET_MAX_IOV))
# error "LNET_MAX_PAYLOAD too large - error in configure --with-max-payload-mb"
#endif

/* forward refs */
struct lnet_libmd;

typedef struct lnet_msg {
        struct list_head        msg_activelist;
        struct list_head        msg_list;          /* Q for credits/MD */

        lnet_process_id_t       msg_target;
        /* where is it from, it's only for building event */
        lnet_nid_t              msg_from;
        __u32                   msg_type;

        /* committed for sending */
        unsigned int            msg_tx_committed:1;
        /* CPT # this message committed for sending */
        unsigned int            msg_tx_cpt:15;
        /* committed for receiving */
        unsigned int            msg_rx_committed:1;
        /* CPT # this message committed for receiving */
        unsigned int            msg_rx_cpt:15;
        /* queued for tx credit */
        unsigned int            msg_tx_delayed:1;
        /* queued for RX buffer */
        unsigned int            msg_rx_delayed:1;
        /* ready for pending on RX delay list */
        unsigned int            msg_rx_ready_delay:1;

        unsigned int    msg_vmflush:1;          /* VM trying to free memory */
        unsigned int    msg_target_is_router:1; /* sending to a router */
        unsigned int    msg_routing:1;          /* being forwarded */
        unsigned int    msg_ack:1;              /* ack on finalize (PUT) */
        unsigned int    msg_sending:1;          /* outgoing message */
        unsigned int    msg_receiving:1;        /* being received */
        unsigned int    msg_txcredit:1;         /* taken an NI send credit */
        unsigned int    msg_peertxcredit:1;     /* taken a peer send credit */
        unsigned int    msg_rtrcredit:1;        /* taken a global router credit */
        unsigned int    msg_peerrtrcredit:1;    /* taken a peer router credit */
        unsigned int    msg_onactivelist:1;     /* on the activelist */
        unsigned int    msg_rdma_get:1;

        struct lnet_peer        *msg_txpeer;     /* peer I'm sending to */
        struct lnet_peer        *msg_rxpeer;     /* peer I received from */

        void                    *msg_private;
        struct lnet_libmd       *msg_md;

        unsigned int             msg_len;
        unsigned int             msg_wanted;
        unsigned int             msg_offset;
        unsigned int             msg_niov;
        struct kvec             *msg_iov;
        lnet_kiov_t             *msg_kiov;

        lnet_event_t             msg_ev;
        lnet_hdr_t               msg_hdr;
} lnet_msg_t;

typedef struct lnet_libhandle {
        struct list_head        lh_hash_chain;
        __u64                   lh_cookie;
} lnet_libhandle_t;

#define lh_entry(ptr, type, member) \
        ((type *)((char *)(ptr) - (char *)(&((type *)0)->member)))

typedef struct lnet_eq {
        struct list_head          eq_list;
        lnet_libhandle_t          eq_lh;
        lnet_seq_t                eq_enq_seq;
        lnet_seq_t                eq_deq_seq;
        unsigned int              eq_size;
        lnet_eq_handler_t         eq_callback;
        lnet_event_t             *eq_events;
        int                     **eq_refs;      /* percpt refcount for EQ */
} lnet_eq_t;

typedef struct lnet_me {
        struct list_head         me_list;
        lnet_libhandle_t         me_lh;
        lnet_process_id_t        me_match_id;
        unsigned int             me_portal;
        unsigned int             me_pos;        /* hash offset in mt_hash */
        __u64                    me_match_bits;
        __u64                    me_ignore_bits;
        lnet_unlink_t            me_unlink;
        struct lnet_libmd       *me_md;
} lnet_me_t;

typedef struct lnet_libmd {
        struct list_head         md_list;
        lnet_libhandle_t         md_lh;
        lnet_me_t               *md_me;
        char                    *md_start;
        unsigned int             md_offset;
        unsigned int             md_length;
        unsigned int             md_max_size;
        int                      md_threshold;
        int                      md_refcount;
        unsigned int             md_options;
        unsigned int             md_flags;
        void                    *md_user_ptr;
        lnet_eq_t               *md_eq;
        unsigned int             md_niov;       /* # frags */
        union {
                struct kvec     iov[LNET_MAX_IOV];
                lnet_kiov_t     kiov[LNET_MAX_IOV];
        } md_iov;
} lnet_libmd_t;

#define LNET_MD_FLAG_ZOMBIE             (1 << 0)
#define LNET_MD_FLAG_AUTO_UNLINK        (1 << 1)
#define LNET_MD_FLAG_ABORTED            (1 << 2)

typedef struct {
        /* info about peers we are trying to fail */
        struct list_head        tp_list;        /* ln_test_peers */
        lnet_nid_t              tp_nid;         /* matching nid */
        unsigned int            tp_threshold;   /* # failures to simulate */
} lnet_test_peer_t;

#define LNET_COOKIE_TYPE_MD     1
#define LNET_COOKIE_TYPE_ME     2
#define LNET_COOKIE_TYPE_EQ     3
#define LNET_COOKIE_TYPE_BITS   2
#define LNET_COOKIE_MASK        ((1ULL << LNET_COOKIE_TYPE_BITS) - 1ULL)

struct lnet_ni;                 /* forward ref */

typedef struct lnet_lnd {
        /* fields managed by portals */
        struct list_head        lnd_list;       /* stash in the LND table */
        int                     lnd_refcount;   /* # active instances */

        /* fields initialised by the LND */
        __u32                   lnd_type;

        int  (*lnd_startup)(struct lnet_ni *ni);
        void (*lnd_shutdown)(struct lnet_ni *ni);
        int  (*lnd_ctl)(struct lnet_ni *ni, unsigned int cmd, void *arg);

        /*
         * In data movement APIs below, payload buffers are described as a set
         * of 'niov' fragments which are...
         * EITHER
         *    in virtual memory (struct iovec *iov != NULL)
         * OR
         *    in pages (kernel only: plt_kiov_t *kiov != NULL).
         * The LND may NOT overwrite these fragment descriptors.
         * An 'offset' and may specify a byte offset within the set of
         * fragments to start from
         */

        /*
         * Start sending a preformatted message.  'private' is NULL for PUT and
         * GET messages; otherwise this is a response to an incoming message
         * and 'private' is the 'private' passed to lnet_parse().  Return
         * non-zero for immediate failure, otherwise complete later with
         * lnet_finalize()
         */
        int (*lnd_send)(struct lnet_ni *ni, void *private, lnet_msg_t *msg);

        /*
         * Start receiving 'mlen' bytes of payload data, skipping the following
         * 'rlen' - 'mlen' bytes. 'private' is the 'private' passed to
         * lnet_parse().  Return non-zero for immediate failure, otherwise
         * complete later with lnet_finalize().  This also gives back a receive
         * credit if the LND does flow control.
         */
        int (*lnd_recv)(struct lnet_ni *ni, void *private, lnet_msg_t *msg,
                        int delayed, unsigned int niov,
                        struct kvec *iov, lnet_kiov_t *kiov,
                        unsigned int offset, unsigned int mlen,
                        unsigned int rlen);

        /*
         * lnet_parse() has had to delay processing of this message
         * (e.g. waiting for a forwarding buffer or send credits).  Give the
         * LND a chance to free urgently needed resources.  If called, return 0
         * for success and do NOT give back a receive credit; that has to wait
         * until lnd_recv() gets called.  On failure return < 0 and
         * release resources; lnd_recv() will not be called.
         */
        int (*lnd_eager_recv)(struct lnet_ni *ni, void *private,
                              lnet_msg_t *msg, void **new_privatep);

        /* notification of peer health */
        void (*lnd_notify)(struct lnet_ni *ni, lnet_nid_t peer, int alive);

        /* query of peer aliveness */
        void (*lnd_query)(struct lnet_ni *ni, lnet_nid_t peer,
                          unsigned long *when);

        /* accept a new connection */
        int (*lnd_accept)(struct lnet_ni *ni, struct socket *sock);
} lnd_t;

struct lnet_tx_queue {
        int                     tq_credits;     /* # tx credits free */
        int                     tq_credits_min; /* lowest it's been */
        int                     tq_credits_max; /* total # tx credits */
        struct list_head        tq_delayed;     /* delayed TXs */
};

typedef struct lnet_ni {
        spinlock_t                ni_lock;
        struct list_head          ni_list;      /* chain on ln_nis */
        struct list_head          ni_cptlist;   /* chain on ln_nis_cpt */
        int                       ni_maxtxcredits; /* # tx credits  */
        /* # per-peer send credits */
        int                       ni_peertxcredits;
        /* # per-peer router buffer credits */
        int                       ni_peerrtrcredits;
        /* seconds to consider peer dead */
        int                       ni_peertimeout;
        int                       ni_ncpts;     /* number of CPTs */
        __u32                    *ni_cpts;      /* bond NI on some CPTs */
        lnet_nid_t                ni_nid;       /* interface's NID */
        void                     *ni_data;      /* instance-specific data */
        lnd_t                    *ni_lnd;       /* procedural interface */
        struct lnet_tx_queue    **ni_tx_queues; /* percpt TX queues */
        int                     **ni_refs;      /* percpt reference count */
        time64_t                  ni_last_alive;/* when I was last alive */
        lnet_ni_status_t         *ni_status;    /* my health status */
        /* equivalent interfaces to use */
        char                     *ni_interfaces[LNET_MAX_INTERFACES];
} lnet_ni_t;

#define LNET_PROTO_PING_MATCHBITS       0x8000000000000000LL

/*
 * NB: value of these features equal to LNET_PROTO_PING_VERSION_x
 * of old LNet, so there shouldn't be any compatibility issue
 */
#define LNET_PING_FEAT_INVAL            (0)             /* no feature */
#define LNET_PING_FEAT_BASE             (1 << 0)        /* just a ping */
#define LNET_PING_FEAT_NI_STATUS        (1 << 1)        /* return NI status */
#define LNET_PING_FEAT_RTE_DISABLED     (1 << 2)        /* Routing enabled */

#define LNET_PING_FEAT_MASK             (LNET_PING_FEAT_BASE | \
                                         LNET_PING_FEAT_NI_STATUS)

/* router checker data, per router */
#define LNET_MAX_RTR_NIS   16
#define LNET_PINGINFO_SIZE offsetof(lnet_ping_info_t, pi_ni[LNET_MAX_RTR_NIS])
typedef struct {
        /* chain on the_lnet.ln_zombie_rcd or ln_deathrow_rcd */
        struct list_head         rcd_list;
        lnet_handle_md_t         rcd_mdh;       /* ping buffer MD */
        struct lnet_peer        *rcd_gateway;   /* reference to gateway */
        lnet_ping_info_t        *rcd_pinginfo;  /* ping buffer */
} lnet_rc_data_t;

typedef struct lnet_peer {
        struct list_head         lp_hashlist;   /* chain on peer hash */
        struct list_head         lp_txq;        /* messages blocking for
                                                   tx credits */
        struct list_head         lp_rtrq;       /* messages blocking for
                                                   router credits */
        struct list_head         lp_rtr_list;   /* chain on router list */
        int                      lp_txcredits;  /* # tx credits available */
        int                      lp_mintxcredits;  /* low water mark */
        int                      lp_rtrcredits;    /* # router credits */
        int                      lp_minrtrcredits; /* low water mark */
        unsigned int             lp_alive:1;       /* alive/dead? */
        unsigned int             lp_notify:1;   /* notification outstanding? */
        unsigned int             lp_notifylnd:1;/* outstanding notification
                                                   for LND? */
        unsigned int             lp_notifying:1; /* some thread is handling
                                                    notification */
        unsigned int             lp_ping_notsent;/* SEND event outstanding
                                                    from ping */
        int                      lp_alive_count; /* # times router went
                                                    dead<->alive */
        long                     lp_txqnob;      /* bytes queued for sending */
        unsigned long            lp_timestamp;   /* time of last aliveness
                                                    news */
        unsigned long            lp_ping_timestamp;/* time of last ping
                                                      attempt */
        unsigned long            lp_ping_deadline; /* != 0 if ping reply
                                                      expected */
        unsigned long            lp_last_alive; /* when I was last alive */
        unsigned long            lp_last_query; /* when lp_ni was queried
                                                   last time */
        lnet_ni_t               *lp_ni;         /* interface peer is on */
        lnet_nid_t               lp_nid;        /* peer's NID */
        int                      lp_refcount;   /* # refs */
        int                      lp_cpt;        /* CPT this peer attached on */
        /* # refs from lnet_route_t::lr_gateway */
        int                      lp_rtr_refcount;
        /* returned RC ping features */
        unsigned int             lp_ping_feats;
        struct list_head         lp_routes;     /* routers on this peer */
        lnet_rc_data_t          *lp_rcd;        /* router checker state */
} lnet_peer_t;

/* peer hash size */
#define LNET_PEER_HASH_BITS     9
#define LNET_PEER_HASH_SIZE     (1 << LNET_PEER_HASH_BITS)

/* peer hash table */
struct lnet_peer_table {
        int                      pt_version;    /* /proc validity stamp */
        int                      pt_number;     /* # peers extant */
        /* # zombies to go to deathrow (and not there yet) */
        int                      pt_zombies;
        struct list_head         pt_deathrow;   /* zombie peers */
        struct list_head        *pt_hash;       /* NID->peer hash */
};

/*
 * peer aliveness is enabled only on routers for peers in a network where the
 * lnet_ni_t::ni_peertimeout has been set to a positive value
 */
#define lnet_peer_aliveness_enabled(lp) (the_lnet.ln_routing && \
                                         (lp)->lp_ni->ni_peertimeout > 0)

typedef struct {
        struct list_head         lr_list;       /* chain on net */
        struct list_head         lr_gwlist;     /* chain on gateway */
        lnet_peer_t             *lr_gateway;    /* router node */
        __u32                    lr_net;        /* remote network number */
        int                      lr_seq;        /* sequence for round-robin */
        unsigned int             lr_downis;     /* number of down NIs */
        __u32                    lr_hops;       /* how far I am */
        unsigned int             lr_priority;   /* route priority */
} lnet_route_t;

#define LNET_REMOTE_NETS_HASH_DEFAULT   (1U << 7)
#define LNET_REMOTE_NETS_HASH_MAX       (1U << 16)
#define LNET_REMOTE_NETS_HASH_SIZE      (1 << the_lnet.ln_remote_nets_hbits)

typedef struct {
        struct list_head        lrn_list;       /* chain on
                                                   ln_remote_nets_hash */
        struct list_head        lrn_routes;     /* routes to me */
        __u32                   lrn_net;        /* my net number */
} lnet_remotenet_t;

/** lnet message has credit and can be submitted to lnd for send/receive */
#define LNET_CREDIT_OK          0
/** lnet message is waiting for credit */
#define LNET_CREDIT_WAIT        1

typedef struct {
        struct list_head        rbp_bufs;       /* my free buffer pool */
        struct list_head        rbp_msgs;       /* messages blocking
                                                   for a buffer */
        int                     rbp_npages;     /* # pages in each buffer */
        /* requested number of buffers */
        int                     rbp_req_nbuffers;
        /* # buffers actually allocated */
        int                     rbp_nbuffers;
        int                     rbp_credits;    /* # free buffers /
                                                     blocked messages */
        int                     rbp_mincredits; /* low water mark */
} lnet_rtrbufpool_t;

typedef struct {
        struct list_head         rb_list;       /* chain on rbp_bufs */
        lnet_rtrbufpool_t       *rb_pool;       /* owning pool */
        lnet_kiov_t              rb_kiov[0];    /* the buffer space */
} lnet_rtrbuf_t;

#define LNET_PEER_HASHSIZE      503     /* prime! */

#define LNET_TINY_BUF_IDX       0
#define LNET_SMALL_BUF_IDX      1
#define LNET_LARGE_BUF_IDX      2

/* # different router buffer pools */
#define LNET_NRBPOOLS           (LNET_LARGE_BUF_IDX + 1)

enum {
        /* Didn't match anything */
        LNET_MATCHMD_NONE       = (1 << 0),
        /* Matched OK */
        LNET_MATCHMD_OK         = (1 << 1),
        /* Must be discarded */
        LNET_MATCHMD_DROP       = (1 << 2),
        /* match and buffer is exhausted */
        LNET_MATCHMD_EXHAUSTED  = (1 << 3),
        /* match or drop */
        LNET_MATCHMD_FINISH     = (LNET_MATCHMD_OK | LNET_MATCHMD_DROP),
};

/* Options for lnet_portal_t::ptl_options */
#define LNET_PTL_LAZY           (1 << 0)
#define LNET_PTL_MATCH_UNIQUE   (1 << 1)        /* unique match, for RDMA */
#define LNET_PTL_MATCH_WILDCARD (1 << 2)        /* wildcard match,
                                                   request portal */

/* parameter for matching operations (GET, PUT) */
struct lnet_match_info {
        __u64                   mi_mbits;
        lnet_process_id_t       mi_id;
        unsigned int            mi_opc;
        unsigned int            mi_portal;
        unsigned int            mi_rlength;
        unsigned int            mi_roffset;
};

/* ME hash of RDMA portal */
#define LNET_MT_HASH_BITS               8
#define LNET_MT_HASH_SIZE               (1 << LNET_MT_HASH_BITS)
#define LNET_MT_HASH_MASK               (LNET_MT_HASH_SIZE - 1)
/*
 * we allocate (LNET_MT_HASH_SIZE + 1) entries for lnet_match_table::mt_hash,
 * the last entry is reserved for MEs with ignore-bits
 */
#define LNET_MT_HASH_IGNORE             LNET_MT_HASH_SIZE
/*
 * __u64 has 2^6 bits, so need 2^(LNET_MT_HASH_BITS - LNET_MT_BITS_U64) which
 * is 4 __u64s as bit-map, and add an extra __u64 (only use one bit) for the
 * ME-list with ignore-bits, which is mtable::mt_hash[LNET_MT_HASH_IGNORE]
 */
#define LNET_MT_BITS_U64                6       /* 2^6 bits */
#define LNET_MT_EXHAUSTED_BITS          (LNET_MT_HASH_BITS - LNET_MT_BITS_U64)
#define LNET_MT_EXHAUSTED_BMAP          ((1 << LNET_MT_EXHAUSTED_BITS) + 1)

/* portal match table */
struct lnet_match_table {
        /* reserved for upcoming patches, CPU partition ID */
        unsigned int             mt_cpt;
        unsigned int             mt_portal;     /* portal index */
        /*
         * match table is set as "enabled" if there's non-exhausted MD
         * attached on mt_mhash, it's only valid for wildcard portal
         */
        unsigned int             mt_enabled;
        /* bitmap to flag whether MEs on mt_hash are exhausted or not */
        __u64                    mt_exhausted[LNET_MT_EXHAUSTED_BMAP];
        struct list_head        *mt_mhash;      /* matching hash */
};

/* these are only useful for wildcard portal */
/* Turn off message rotor for wildcard portals */
#define LNET_PTL_ROTOR_OFF      0
/* round-robin dispatch all PUT messages for wildcard portals */
#define LNET_PTL_ROTOR_ON       1
/* round-robin dispatch routed PUT message for wildcard portals */
#define LNET_PTL_ROTOR_RR_RT    2
/* dispatch routed PUT message by hashing source NID for wildcard portals */
#define LNET_PTL_ROTOR_HASH_RT  3

typedef struct lnet_portal {
        spinlock_t                ptl_lock;
        unsigned int              ptl_index;    /* portal ID, reserved */
        /* flags on this portal: lazy, unique... */
        unsigned int              ptl_options;
        /* list of messages which are stealing buffer */
        struct list_head          ptl_msg_stealing;
        /* messages blocking for MD */
        struct list_head          ptl_msg_delayed;
        /* Match table for each CPT */
        struct lnet_match_table **ptl_mtables;
        /* spread rotor of incoming "PUT" */
        unsigned int              ptl_rotor;
        /* # active entries for this portal */
        int                       ptl_mt_nmaps;
        /* array of active entries' cpu-partition-id */
        int                       ptl_mt_maps[0];
} lnet_portal_t;

#define LNET_LH_HASH_BITS       12
#define LNET_LH_HASH_SIZE       (1ULL << LNET_LH_HASH_BITS)
#define LNET_LH_HASH_MASK       (LNET_LH_HASH_SIZE - 1)

/* resource container (ME, MD, EQ) */
struct lnet_res_container {
        unsigned int             rec_type;      /* container type */
        __u64                    rec_lh_cookie; /* cookie generator */
        struct list_head         rec_active;    /* active resource list */
        struct list_head        *rec_lh_hash;   /* handle hash */
};

/* message container */
struct lnet_msg_container {
        int                       msc_init;     /* initialized or not */
        /* max # threads finalizing */
        int                       msc_nfinalizers;
        /* msgs waiting to complete finalizing */
        struct list_head          msc_finalizing;
        struct list_head          msc_active;   /* active message list */
        /* threads doing finalization */
        void                    **msc_finalizers;
};

/* Router Checker states */
#define LNET_RC_STATE_SHUTDOWN          0       /* not started */
#define LNET_RC_STATE_RUNNING           1       /* started up OK */
#define LNET_RC_STATE_STOPPING          2       /* telling thread to stop */

typedef struct {
        /* CPU partition table of LNet */
        struct cfs_cpt_table             *ln_cpt_table;
        /* number of CPTs in ln_cpt_table */
        unsigned int                      ln_cpt_number;
        unsigned int                      ln_cpt_bits;

        /* protect LNet resources (ME/MD/EQ) */
        struct cfs_percpt_lock           *ln_res_lock;
        /* # portals */
        int                               ln_nportals;
        /* the vector of portals */
        lnet_portal_t                   **ln_portals;
        /* percpt ME containers */
        struct lnet_res_container       **ln_me_containers;
        /* percpt MD container */
        struct lnet_res_container       **ln_md_containers;

        /* Event Queue container */
        struct lnet_res_container         ln_eq_container;
        wait_queue_head_t                 ln_eq_waitq;
        spinlock_t                        ln_eq_wait_lock;
        unsigned int                      ln_remote_nets_hbits;

        /* protect NI, peer table, credits, routers, rtrbuf... */
        struct cfs_percpt_lock           *ln_net_lock;
        /* percpt message containers for active/finalizing/freed message */
        struct lnet_msg_container       **ln_msg_containers;
        lnet_counters_t                 **ln_counters;
        struct lnet_peer_table          **ln_peer_tables;
        /* failure simulation */
        struct list_head                  ln_test_peers;
        struct list_head                  ln_drop_rules;
        struct list_head                  ln_delay_rules;

        struct list_head                  ln_nis;       /* LND instances */
        /* NIs bond on specific CPT(s) */
        struct list_head                  ln_nis_cpt;
        /* dying LND instances */
        struct list_head                  ln_nis_zombie;
        lnet_ni_t                        *ln_loni;      /* the loopback NI */

        /* remote networks with routes to them */
        struct list_head                 *ln_remote_nets_hash;
        /* validity stamp */
        __u64                             ln_remote_nets_version;
        /* list of all known routers */
        struct list_head                  ln_routers;
        /* validity stamp */
        __u64                             ln_routers_version;
        /* percpt router buffer pools */
        lnet_rtrbufpool_t               **ln_rtrpools;

        lnet_handle_md_t                  ln_ping_target_md;
        lnet_handle_eq_t                  ln_ping_target_eq;
        lnet_ping_info_t                 *ln_ping_info;

        /* router checker startup/shutdown state */
        int                               ln_rc_state;
        /* router checker's event queue */
        lnet_handle_eq_t                  ln_rc_eqh;
        /* rcd still pending on net */
        struct list_head                  ln_rcd_deathrow;
        /* rcd ready for free */
        struct list_head                  ln_rcd_zombie;
        /* serialise startup/shutdown */
        struct semaphore                  ln_rc_signal;

        struct mutex                      ln_api_mutex;
        struct mutex                      ln_lnd_mutex;
        struct mutex                      ln_delay_mutex;
        /* Have I called LNetNIInit myself? */
        int                               ln_niinit_self;
        /* LNetNIInit/LNetNIFini counter */
        int                               ln_refcount;
        /* shutdown in progress */
        int                               ln_shutdown;

        int                               ln_routing;   /* am I a router? */
        lnet_pid_t                        ln_pid;       /* requested pid */
        /* uniquely identifies this ni in this epoch */
        __u64                             ln_interface_cookie;
        /* registered LNDs */
        struct list_head                  ln_lnds;

        /* test protocol compatibility flags */
        int                               ln_testprotocompat;

        /*
         * 0 - load the NIs from the mod params
         * 1 - do not load the NIs from the mod params
         * Reverse logic to ensure that other calls to LNetNIInit
         * need no change
         */
        bool                              ln_nis_from_mod_params;

        /*
         * waitq for router checker.  As long as there are no routes in
         * the list, the router checker will sleep on this queue.  when
         * routes are added the thread will wake up
         */
        wait_queue_head_t                 ln_rc_waitq;

} lnet_t;

#endif