/*      $NetBSD: isns_util.c,v 1.2 2012/03/21 05:33:27 matt Exp $       */

/*-
* Copyright (c) 2004,2009 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Wasabi Systems, Inc.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/

/*
* isns_util.c
*/

#include <sys/cdefs.h>
__RCSID("$NetBSD: isns_util.c,v 1.2 2012/03/21 05:33:27 matt Exp $");


#include <sys/types.h>

#include <pthread.h>
#include <string.h>
#include <unistd.h>

#include "isns.h"
#include "isns_config.h"

#define ISNS_MAX_DISCONNECTS_PER_TRANS  3

int
isns_issue_cmd(struct isns_config_s *cfg_p, uint8_t cmd_type)
{
       return (int)write(cfg_p->pipe_fds[1], &cmd_type, 1);
}


int
isns_issue_cmd_with_data(struct isns_config_s *cfg_p, uint8_t cmd_type,
   uint8_t *data_p, int data_len)
{
       struct iovec iov[2];

       iov[0].iov_base = &cmd_type;
       iov[0].iov_len = 1;
       iov[1].iov_base = data_p;
       iov[1].iov_len = data_len;

       return (int)isns_file_writev(cfg_p->pipe_fds[1], iov, 2);
}


int
isns_change_kevent_list(struct isns_config_s *cfg_p,
   uintptr_t ident, uint32_t filter, uint32_t flags, int64_t data, intptr_t udata)
{
       struct kevent evt;

       EV_SET(&evt, ident, filter, flags, 0, data, udata);
       return kevent(cfg_p->kq, &evt, 1, NULL, 0, NULL);
}


struct isns_config_s *
isns_new_config(void)
{
       struct isns_config_s *cfg_p;
       pthread_mutexattr_t mutexattr;

       cfg_p = (struct isns_config_s *)
           isns_malloc(sizeof(struct isns_config_s));
       if (cfg_p == NULL) {
               DBG("isns_new_config: error on isns_malloc() [1]\n");
               return NULL;
       }
       cfg_p->kq = -1;
       cfg_p->pipe_fds[0] = -1;
       cfg_p->pipe_fds[1] = -1;
       cfg_p->curtask_p = NULL;
       cfg_p->sd_connected = 0;
       cfg_p->ai_p = NULL;
       cfg_p->pdu_in_p = NULL;

       cfg_p->refresh_p = NULL;

       pthread_mutexattr_init(&mutexattr);
       pthread_mutexattr_settype(&mutexattr, ISNS_MUTEX_TYPE_NORMAL);
       if (pthread_mutex_init(&cfg_p->taskq_mutex, &mutexattr) != 0) {
               DBG("isns_new_config: error on pthread_mutex_init() [1]\n");
               isns_free(cfg_p);
               return NULL;
       }

       pthread_mutexattr_init(&mutexattr);
       pthread_mutexattr_settype(&mutexattr, ISNS_MUTEX_TYPE_NORMAL);
       if (pthread_mutex_init(&cfg_p->trans_mutex, &mutexattr) != 0) {
               DBG("isns_new_config: error on pthread_mutex_init() [2]\n");
               pthread_mutex_destroy(&cfg_p->taskq_mutex);
               isns_free(cfg_p);
               return NULL;
       }

       SIMPLEQ_INIT(&cfg_p->taskq_head);

       cfg_p->control_thread_p = (pthread_t *)isns_malloc(sizeof(pthread_t));
       if (cfg_p->control_thread_p == NULL) {
               DBG("isns_new_config: error on isns_malloc() [1]\n");
               isns_destroy_config(cfg_p);
               return NULL;
       }

       return cfg_p;
}


void
isns_destroy_config(struct isns_config_s *cfg_p)
{
       struct isns_task_s *task_p;

       if (cfg_p != NULL) {
               if (cfg_p->kq != -1)
                       close(cfg_p->kq);
               if (cfg_p->pipe_fds[0] != -1)
                       close(cfg_p->pipe_fds[0]);
               if (cfg_p->pipe_fds[1] != -1)
                       close(cfg_p->pipe_fds[1]);
               if (cfg_p->control_thread_p != NULL)
                       isns_free(cfg_p->control_thread_p);
               if (cfg_p->refresh_p != NULL) {
                       if (cfg_p->refresh_p->trans_p != NULL)
                               isns_free_trans(cfg_p->refresh_p->trans_p);
                       isns_free(cfg_p->refresh_p);
               }
               /* Free the current task, if necessary. */
               if ((task_p = cfg_p->curtask_p) != NULL) {
                       if (task_p->task_type == ISNS_TASK_SEND_PDU)
                               isns_complete_trans(task_p->var.send_pdu.trans_p);
                       isns_free_task(task_p);
               }
               /* Empty the task queue of any pending tasks and free them. */
               while ((task_p = isns_taskq_remove(cfg_p)) != NULL) {
                       if (task_p->task_type == ISNS_TASK_SEND_PDU)
                               isns_complete_trans(task_p->var.send_pdu.trans_p);
                       isns_free_task(task_p);
               }
               pthread_mutex_destroy(&cfg_p->taskq_mutex);
               pthread_mutex_destroy(&cfg_p->trans_mutex);
               if (cfg_p->ai_p != NULL) {
                       if (cfg_p->ai_p->ai_canonname != NULL)
                               isns_free(cfg_p->ai_p->ai_canonname);
                       if (cfg_p->ai_p->ai_addr != NULL)
                               isns_free(cfg_p->ai_p->ai_addr);
                       isns_free(cfg_p->ai_p);
               }
               isns_free(cfg_p);
       }
}


/*
* isns_thread_create()
*/
int
isns_thread_create(struct isns_config_s *cfg_p)
{
       char namebuf[ISNS_THREAD_MAX_NAMELEN];
       int error;
       pthread_attr_t attr;

       DBG("isns_thread_create: entered\n");

       strcpy(namebuf, "isns_control");
       error = pthread_attr_init(&attr);
       if (error != 0) {
               DBG("isns_thread_create: error on pthread_threadattr_init\n");
               return error;
       }

       error = pthread_attr_setname_np(&attr, namebuf, NULL);
       if (error != 0) {
               DBG("isns_thread_create: "
                   "error on pthread_threadattr_setname\n");
               pthread_attr_destroy(&attr);
               return error;
       }

       error = pthread_create(cfg_p->control_thread_p,
           &attr, isns_control_thread, cfg_p);
       pthread_attr_destroy(&attr);

       if (error != 0) {
               DBG("isns_thread_create: error on pthread_thread_create\n");
               return error;
       }

       return error;
}


/*
* isns_thread_destroy()
*/
void
isns_thread_destroy(struct isns_config_s *cfg_p)
{
       int error;
       void *rv;

       DBG("isns_thread_destroy: entered\n");

       if ((cfg_p == NULL) || (cfg_p->control_thread_p == NULL))
               return;

       DBG("isns_thread_destroy: about to wait (join) on thread\n");
       error = pthread_join(*cfg_p->control_thread_p, &rv);
       if (error) {
               DBG("isns_thread_destroy: error on pthread_thread_join\n");
               return;
       }

       DBG("isns_thread_destroy: done waiting on thread\n");
}

/*
*
*/
void
isns_process_connection_loss(struct isns_config_s *cfg_p)
{
       struct isns_trans_s *trans_p;
       struct isns_pdu_s *pdu_p, *free_pdu_p;


       DBG("isns_process_connection_loss: entered\n");

       if (cfg_p->curtask_p != NULL) {
               trans_p = cfg_p->curtask_p->var.send_pdu.trans_p;

               if (trans_p->disconnect_cnt == ISNS_MAX_DISCONNECTS_PER_TRANS) {
                       isns_complete_trans(trans_p);
                       isns_end_task(cfg_p->curtask_p);

                       if (cfg_p->pdu_in_p != NULL) {
                               isns_free_pdu(cfg_p->pdu_in_p);
                               cfg_p->pdu_in_p = NULL;
                       }
               } else {
                       trans_p->disconnect_cnt++;

                       if (trans_p->pdu_rsp_list != NULL) {
                               pdu_p = trans_p->pdu_rsp_list;
                               while (pdu_p != NULL) {
                                       free_pdu_p = pdu_p;
                                       pdu_p = pdu_p->next;
                                       isns_free_pdu(free_pdu_p);
                               }
                       }

                       isns_taskq_insert_head(cfg_p, cfg_p->curtask_p);
                       cfg_p->curtask_p = NULL;

                       isns_issue_cmd(cfg_p, ISNS_CMD_PROCESS_TASKQ);
               }
       }
}

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