ocs_sm.h

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/*
 * Copyright (c) 2011-2015, Emulex
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. 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.
 *
 * 3. Neither the name of the copyright holder 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
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 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
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/**
 * @file
 * Generic state machine framework declarations.
 */

#ifndef _OCS_SM_H
#define _OCS_SM_H

/**
 * State Machine (SM) IDs.
 */
enum {
    OCS_SM_COMMON = 0,
    OCS_SM_DOMAIN,
    OCS_SM_PORT,
    OCS_SM_LOGIN,
    OCS_SM_LAST
};

#define OCS_SM_EVENT_SHIFT      24
#define OCS_SM_EVENT_START(id)      ((id) << OCS_SM_EVENT_SHIFT)

extern const char *ocs_sm_id[];     /**< String format of the above enums. */

/**
 * State Machine events.
 */
typedef enum {
    /* Common Events */
    OCS_EVT_ENTER = OCS_SM_EVENT_START(OCS_SM_COMMON),
    OCS_EVT_REENTER,
    OCS_EVT_EXIT,
    OCS_EVT_SHUTDOWN,
    OCS_EVT_ALL_CHILD_NODES_FREE,
    OCS_EVT_RESUME,
    OCS_EVT_TIMER_EXPIRED,

    /* Domain Events */
    OCS_EVT_RESPONSE = OCS_SM_EVENT_START(OCS_SM_DOMAIN),
    OCS_EVT_ERROR,

    OCS_EVT_DOMAIN_FOUND,
    OCS_EVT_DOMAIN_ALLOC_OK,
    OCS_EVT_DOMAIN_ALLOC_FAIL,
    OCS_EVT_DOMAIN_REQ_ATTACH,
    OCS_EVT_DOMAIN_ATTACH_OK,
    OCS_EVT_DOMAIN_ATTACH_FAIL,
    OCS_EVT_DOMAIN_LOST,
    OCS_EVT_DOMAIN_FREE_OK,
    OCS_EVT_DOMAIN_FREE_FAIL,
    OCS_EVT_HAL_DOMAIN_REQ_ATTACH,
    OCS_EVT_HAL_DOMAIN_REQ_FREE,

    /* Sport Events */
    OCS_EVT_SPORT_ALLOC_OK = OCS_SM_EVENT_START(OCS_SM_PORT),
    OCS_EVT_SPORT_ALLOC_FAIL,
    OCS_EVT_SPORT_ATTACH_OK,
    OCS_EVT_SPORT_ATTACH_FAIL,
    OCS_EVT_SPORT_FREE_OK,
    OCS_EVT_SPORT_FREE_FAIL,
    OCS_EVT_SPORT_TOPOLOGY_NOTIFY,
    OCS_EVT_HAL_PORT_ALLOC_OK,
    OCS_EVT_HAL_PORT_ALLOC_FAIL,
    OCS_EVT_HAL_PORT_ATTACH_OK,
    OCS_EVT_HAL_PORT_REQ_ATTACH,
    OCS_EVT_HAL_PORT_REQ_FREE,
    OCS_EVT_HAL_PORT_FREE_OK,

    /* Login Events */
    OCS_EVT_SRRS_ELS_REQ_OK = OCS_SM_EVENT_START(OCS_SM_LOGIN),
    OCS_EVT_SRRS_ELS_CMPL_OK,
    OCS_EVT_SRRS_ELS_REQ_FAIL,
    OCS_EVT_SRRS_ELS_CMPL_FAIL,
    OCS_EVT_SRRS_ELS_REQ_RJT,
    OCS_EVT_NODE_ATTACH_OK,
    OCS_EVT_NODE_ATTACH_FAIL,
    OCS_EVT_NODE_FREE_OK,
    OCS_EVT_NODE_FREE_FAIL,
    OCS_EVT_ELS_FRAME,
    OCS_EVT_ELS_REQ_TIMEOUT,
    OCS_EVT_ELS_REQ_ABORTED,
    OCS_EVT_ABORT_ELS,      /**< request an ELS IO be aborted */
    OCS_EVT_ELS_ABORT_CMPL,         /**< ELS abort process complete */

    OCS_EVT_ABTS_RCVD,

    OCS_EVT_NODE_MISSING,       /**< node is not in the GID_PT payload */
    OCS_EVT_NODE_REFOUND,       /**< node is allocated and in the GID_PT payload */
    OCS_EVT_SHUTDOWN_IMPLICIT_LOGO, /**< node shutting down due to PLOGI recvd (implicit logo) */
    OCS_EVT_SHUTDOWN_EXPLICIT_LOGO, /**< node shutting down due to LOGO recvd/sent (explicit logo) */

    OCS_EVT_PLOGI_RCVD,
    OCS_EVT_FLOGI_RCVD,
    OCS_EVT_LOGO_RCVD,
    OCS_EVT_RRQ_RCVD,
    OCS_EVT_PRLI_RCVD,
    OCS_EVT_PRLO_RCVD,
    OCS_EVT_PDISC_RCVD,
    OCS_EVT_FDISC_RCVD,
    OCS_EVT_ADISC_RCVD,
    OCS_EVT_RSCN_RCVD,
    OCS_EVT_SCR_RCVD,
    OCS_EVT_ELS_RCVD,

    OCS_EVT_FCP_CMD_RCVD,

    /* Used by fabric emulation */
    OCS_EVT_RFT_ID_RCVD,
    OCS_EVT_RFF_ID_RCVD,
    OCS_EVT_GNN_ID_RCVD,
    OCS_EVT_GPN_ID_RCVD,
    OCS_EVT_GFPN_ID_RCVD,
    OCS_EVT_GFF_ID_RCVD,
    OCS_EVT_GID_FT_RCVD,
    OCS_EVT_GID_PT_RCVD,
    OCS_EVT_RPN_ID_RCVD,
    OCS_EVT_RNN_ID_RCVD,
    OCS_EVT_RCS_ID_RCVD,
    OCS_EVT_RSNN_NN_RCVD,
    OCS_EVT_RSPN_ID_RCVD,
    OCS_EVT_RHBA_RCVD,
    OCS_EVT_RPA_RCVD,
    OCS_EVT_GA_NXT_RCVD,

    OCS_EVT_GIDPT_DELAY_EXPIRED,

    /* SCSI Target Server events */
    OCS_EVT_ABORT_IO,
    OCS_EVT_ABORT_IO_NO_RESP,
    OCS_EVT_IO_CMPL,
    OCS_EVT_IO_CMPL_ERRORS,
    OCS_EVT_RESP_CMPL,
    OCS_EVT_ABORT_CMPL,
    OCS_EVT_NODE_ACTIVE_IO_LIST_EMPTY,
    OCS_EVT_NODE_LAST_ACTIVE_IO,
    OCS_EVT_NODE_DEL_INI_COMPLETE,
    OCS_EVT_NODE_DEL_TGT_COMPLETE,
    OCS_EVT_IO_ABORTED_BY_TMF,
    OCS_EVT_IO_ABORT_IGNORED,
    OCS_EVT_IO_FIRST_BURST,
    OCS_EVT_IO_FIRST_BURST_ERR,
    OCS_EVT_IO_FIRST_BURST_ABORTED,

    /* Loopback events */
    OCS_EVT_CT_LOOPBACK_RCVD,
    OCS_EVT_CT_LOOPBACK_RCVD_NO_IO,

    /* Must be last */
    OCS_EVT_LAST
} ocs_sm_event_t;

/* Declare ocs_sm_ctx_s */
typedef struct ocs_sm_ctx_s ocs_sm_ctx_t;

/* State machine state function */
typedef void *(*ocs_sm_function_t)(ocs_sm_ctx_t *, ocs_sm_event_t, void *);

/* State machine context header  */
struct ocs_sm_ctx_s {
    ocs_sm_function_t current_state;
    const char *description;
    void    *app;           /** Application-specific handle. */
};

extern int ocs_sm_post_event(ocs_sm_ctx_t *, ocs_sm_event_t, void *);
extern void ocs_sm_transition(ocs_sm_ctx_t *, ocs_sm_function_t, void *);
extern void ocs_sm_disable(ocs_sm_ctx_t *ctx);
extern const char *ocs_sm_event_name(ocs_sm_event_t evt);

#if 0
#define smtrace(sm) ocs_log_debug(NULL, "%s: %-20s -->   %s\n", sm, ocs_sm_event_name(evt), __func__)
#else
#define smtrace(...)
#endif

#endif /* ! _OCS_SM_H */