/*
 * 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.sun.com/software/products/lustre/docs/GPLv2.pdf
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *
 * GPL HEADER END
 */
/*
 * Copyright (c) 2003, 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/include/lnet/lib-types.h
 *
 * Types used by the library side routines that do not need to be
 * exposed to the user application
 */

#ifndef __LNET_LIB_TYPES_H__
#define __LNET_LIB_TYPES_H__

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

#include <linux/libcfs/libcfs.h>
#include <linux/list.h>
#include <linux/lnet/types.h>

#define WIRE_ATTR       __attribute__((packed))

/* Packed version of lnet_process_id_t to transfer via network */
typedef struct {
        lnet_nid_t nid;
        lnet_pid_t pid;   /* node id / process id */
} WIRE_ATTR lnet_process_id_packed_t;

/* The wire handle's interface cookie only matches one network interface in
 * one epoch (i.e. new cookie when the interface restarts or the node
 * reboots).  The object cookie only matches one object on that interface
 * during that object's lifetime (i.e. no cookie re-use). */
typedef struct {
        __u64 wh_interface_cookie;
        __u64 wh_object_cookie;
} WIRE_ATTR lnet_handle_wire_t;

typedef enum {
        LNET_MSG_ACK = 0,
        LNET_MSG_PUT,
        LNET_MSG_GET,
        LNET_MSG_REPLY,
        LNET_MSG_HELLO,
} lnet_msg_type_t;

/* The variant fields of the portals message header are aligned on an 8
 * byte boundary in the message header.  Note that all types used in these
 * wire structs MUST be fixed size and the smaller types are placed at the
 * end. */
typedef struct lnet_ack {
        lnet_handle_wire_t  dst_wmd;
        __u64          match_bits;
        __u32          mlength;
} WIRE_ATTR lnet_ack_t;

typedef struct lnet_put {
        lnet_handle_wire_t  ack_wmd;
        __u64          match_bits;
        __u64          hdr_data;
        __u32          ptl_index;
        __u32          offset;
} WIRE_ATTR lnet_put_t;

typedef struct lnet_get {
        lnet_handle_wire_t  return_wmd;
        __u64          match_bits;
        __u32          ptl_index;
        __u32          src_offset;
        __u32          sink_length;
} WIRE_ATTR lnet_get_t;

typedef struct lnet_reply {
        lnet_handle_wire_t  dst_wmd;
} WIRE_ATTR lnet_reply_t;

typedef struct lnet_hello {
        __u64         incarnation;
        __u32         type;
} WIRE_ATTR lnet_hello_t;

typedef struct {
        lnet_nid_t        dest_nid;
        lnet_nid_t        src_nid;
        lnet_pid_t        dest_pid;
        lnet_pid_t        src_pid;
        __u32          type;           /* lnet_msg_type_t */
        __u32          payload_length;     /* payload data to follow */
        /*<------__u64 aligned------->*/
        union {
                lnet_ack_t   ack;
                lnet_put_t   put;
                lnet_get_t   get;
                lnet_reply_t reply;
                lnet_hello_t hello;
        } msg;
} WIRE_ATTR lnet_hdr_t;

/* A HELLO message contains a magic number and protocol version
 * code in the header's dest_nid, the peer's NID in the src_nid, and
 * LNET_MSG_HELLO in the type field.  All other common fields are zero
 * (including payload_size; i.e. no payload).
 * This is for use by byte-stream LNDs (e.g. TCP/IP) to check the peer is
 * running the same protocol and to find out its NID. These LNDs should
 * exchange HELLO messages when a connection is first established.  Individual
 * LNDs can put whatever else they fancy in lnet_hdr_t::msg.
 */
typedef struct {
        __u32   magic;                    /* LNET_PROTO_TCP_MAGIC */
        __u16   version_major;            /* increment on incompatible change */
        __u16   version_minor;            /* increment on compatible change */
} WIRE_ATTR lnet_magicversion_t;

/* PROTO MAGIC for LNDs */
#define LNET_PROTO_IB_MAGIC              0x0be91b91
#define LNET_PROTO_RA_MAGIC              0x0be91b92
#define LNET_PROTO_QSW_MAGIC            0x0be91b93
#define LNET_PROTO_GNI_MAGIC            0xb00fbabe /* ask Kim */
#define LNET_PROTO_TCP_MAGIC            0xeebc0ded
#define LNET_PROTO_PTL_MAGIC            0x50746C4E /* 'PtlN' unique magic */
#define LNET_PROTO_MX_MAGIC              0x4d583130 /* 'MX10'! */
#define LNET_PROTO_ACCEPTOR_MAGIC          0xacce7100
#define LNET_PROTO_PING_MAGIC          0x70696E67 /* 'ping' */

/* Placeholder for a future "unified" protocol across all LNDs */
/* Current LNDs that receive a request with this magic will respond with a
 * "stub" reply using their current protocol */
#define LNET_PROTO_MAGIC                    0x45726963 /* ! */


#define LNET_PROTO_TCP_VERSION_MAJOR    1
#define LNET_PROTO_TCP_VERSION_MINOR    0

/* Acceptor connection request */
typedef struct {
        __u32       acr_magic;            /* PTL_ACCEPTOR_PROTO_MAGIC */
        __u32       acr_version;                /* protocol version */
        __u64       acr_nid;                /* target NID */
} WIRE_ATTR lnet_acceptor_connreq_t;

#define LNET_PROTO_ACCEPTOR_VERSION       1

/* 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;

        /* commited for sending */
        unsigned int            msg_tx_committed:1;
        /* CPT # this message committed for sending */
        unsigned int            msg_tx_cpt:15;
        /* commited 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 globel router credit */
        unsigned int      msg_peerrtrcredit:1; /* taken a peer router credit */
        unsigned int      msg_onactivelist:1; /* on the activelist */

        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 iovec     *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 iovec  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)

#ifdef LNET_USE_LIB_FREELIST
typedef struct
{
        void              *fl_objs;       /* single contiguous array of objects */
        int                 fl_nobjs;    /* the number of them */
        int                 fl_objsize;       /* the size (including overhead) of each of them */
        struct list_head             fl_list;     /* where they are enqueued */
} lnet_freelist_t;

typedef struct
{
        struct list_head             fo_list;        /* enqueue on fl_list */
        void              *fo_contents;  /* aligned contents */
} lnet_freeobj_t;
#endif

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 */
        unsigned int      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 immedaite 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 iovec *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, cfs_time_t *when);

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

} lnd_t;

#define LNET_NI_STATUS_UP      0x15aac0de
#define LNET_NI_STATUS_DOWN    0xdeadface
#define LNET_NI_STATUS_INVALID 0x00000000
typedef struct {
        lnet_nid_t ns_nid;
        __u32      ns_status;
        __u32      ns_unused;
} WIRE_ATTR lnet_ni_status_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 */
};

#define LNET_MAX_INTERFACES   16

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 */
        long                    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_MASK             (LNET_PING_FEAT_BASE | \
                                         LNET_PING_FEAT_NI_STATUS)

typedef struct {
        __u32                   pi_magic;
        __u32                   pi_features;
        lnet_pid_t              pi_pid;
        __u32                   pi_nnis;
        lnet_ni_status_t        pi_ni[0];
} WIRE_ATTR lnet_ping_info_t;

/* 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 */
        cfs_time_t      lp_timestamp;    /* time of last aliveness news */
        cfs_time_t      lp_ping_timestamp;    /* time of last ping attempt */
        cfs_time_t      lp_ping_deadline;     /* != 0 if ping reply expected */
        cfs_time_t      lp_last_alive;  /* when I was last alive */
        cfs_time_t      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 */
        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 != 0 && \
                                         (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 */
        unsigned int            lr_hops;        /* how far I am */
} 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;

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 */
        int     rbp_nbuffers;    /* # buffers */
        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;

typedef struct {
        __u32   msgs_alloc;
        __u32   msgs_max;
        __u32   errors;
        __u32   send_count;
        __u32   recv_count;
        __u32   route_count;
        __u32   drop_count;
        __u64   send_length;
        __u64   recv_length;
        __u64   route_length;
        __u64   drop_length;
} WIRE_ATTR lnet_counters_t;

#define LNET_PEER_HASHSIZE   503                /* prime! */

#define LNET_NRBPOOLS    3               /* # different router buffer pools */

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 valide 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 messags 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" */
        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 */
#ifdef LNET_USE_LIB_FREELIST
        lnet_freelist_t         rec_freelist;   /* freelist for resources */
#endif
};

/* 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;
#ifdef LNET_USE_LIB_FREELIST
        lnet_freelist_t         msc_freelist;   /* freelist for messages */
#endif
};

/* 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_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 */
        /* NI to wait for events in */
        lnet_ni_t                       *ln_eq_waitni;

        /* 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;
        int                             ln_init;        /* LNetInit() called? */
        /* 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;

        /* space for network names */
        char                            *ln_network_tokens;
        int                             ln_network_tokens_nob;
        /* test protocol compatibility flags */
        int                             ln_testprotocompat;

} lnet_t;

#endif