LXR linux/drivers/target/iscsi/iscsi_target

   1#ifndef ISCSI_THREAD_QUEUE_H
   2#define ISCSI_THREAD_QUEUE_H
   3
   4/*
   5 * Defines for thread sets.
   6 */
   7extern int iscsi_thread_set_force_reinstatement(struct iscsi_conn *);
   8extern int iscsi_allocate_thread_sets(u32);
   9extern void iscsi_deallocate_thread_sets(void);
  10extern void iscsi_activate_thread_set(struct iscsi_conn *, struct iscsi_thread_set *);
  11extern struct iscsi_thread_set *iscsi_get_thread_set(void);
  12extern void iscsi_set_thread_clear(struct iscsi_conn *, u8);
  13extern void iscsi_set_thread_set_signal(struct iscsi_conn *, u8);
  14extern int iscsi_release_thread_set(struct iscsi_conn *);
  15extern struct iscsi_conn *iscsi_rx_thread_pre_handler(struct iscsi_thread_set *);
  16extern struct iscsi_conn *iscsi_tx_thread_pre_handler(struct iscsi_thread_set *);
  17extern int iscsi_thread_set_init(void);
  18extern void iscsi_thread_set_free(void);
  19
  20extern int iscsi_target_tx_thread(void *);
  21extern int iscsi_target_rx_thread(void *);
  22
  23#define TARGET_THREAD_SET_COUNT                 4
  24
  25#define ISCSI_RX_THREAD                         1
  26#define ISCSI_TX_THREAD                         2
  27#define ISCSI_RX_THREAD_NAME                    "iscsi_trx"
  28#define ISCSI_TX_THREAD_NAME                    "iscsi_ttx"
  29#define ISCSI_BLOCK_RX_THREAD                   0x1
  30#define ISCSI_BLOCK_TX_THREAD                   0x2
  31#define ISCSI_CLEAR_RX_THREAD                   0x1
  32#define ISCSI_CLEAR_TX_THREAD                   0x2
  33#define ISCSI_SIGNAL_RX_THREAD                  0x1
  34#define ISCSI_SIGNAL_TX_THREAD                  0x2
  35
  36/* struct iscsi_thread_set->status */
  37#define ISCSI_THREAD_SET_FREE                   1
  38#define ISCSI_THREAD_SET_ACTIVE                 2
  39#define ISCSI_THREAD_SET_DIE                    3
  40#define ISCSI_THREAD_SET_RESET                  4
  41#define ISCSI_THREAD_SET_DEALLOCATE_THREADS     5
  42
  43/* By default allow a maximum of 32K iSCSI connections */
  44#define ISCSI_TS_BITMAP_BITS                    32768
  45
  46struct iscsi_thread_set {
  47        /* flags used for blocking and restarting sets */
  48        int     blocked_threads;
  49        /* flag for creating threads */
  50        int     create_threads;
  51        /* flag for delaying readding to inactive list */
  52        int     delay_inactive;
  53        /* status for thread set */
  54        int     status;
  55        /* which threads have had signals sent */
  56        int     signal_sent;
  57        /* flag for which threads exited first */
  58        int     thread_clear;
  59        /* Active threads in the thread set */
  60        int     thread_count;
  61        /* Unique thread ID */
  62        u32     thread_id;
  63        /* pointer to connection if set is active */
  64        struct iscsi_conn       *conn;
  65        /* used for controlling ts state accesses */
  66        spinlock_t      ts_state_lock;
  67        /* Used for rx side post startup */
  68        struct completion       rx_post_start_comp;
  69        /* Used for tx side post startup */
  70        struct completion       tx_post_start_comp;
  71        /* used for restarting thread queue */
  72        struct completion       rx_restart_comp;
  73        /* used for restarting thread queue */
  74        struct completion       tx_restart_comp;
  75        /* used for normal unused blocking */
  76        struct completion       rx_start_comp;
  77        /* used for normal unused blocking */
  78        struct completion       tx_start_comp;
  79        /* OS descriptor for rx thread */
  80        struct task_struct      *rx_thread;
  81        /* OS descriptor for tx thread */
  82        struct task_struct      *tx_thread;
  83        /* struct iscsi_thread_set in list list head*/
  84        struct list_head        ts_list;
  85};
  86
  87#endif   /*** ISCSI_THREAD_QUEUE_H ***/
  88