drivers/target/iscsi/iscsi_target_tq.h

   1 #ifndef ISCSI_THREAD_QUEUE_H
   2 #define ISCSI_THREAD_QUEUE_H
   3
   4 /*
   5  * Defines for thread sets.
   6  */
   7 extern int iscsi_thread_set_force_reinstatement(struct iscsi_conn *);
   8 extern int iscsi_allocate_thread_sets(u32);
   9 extern void iscsi_deallocate_thread_sets(void);
  10 extern void iscsi_activate_thread_set(struct iscsi_conn *, struct iscsi_thread_set *);
  11 extern struct iscsi_thread_set *iscsi_get_thread_set(void);
  12 extern void iscsi_set_thread_clear(struct iscsi_conn *, u8);
  13 extern void iscsi_set_thread_set_signal(struct iscsi_conn *, u8);
  14 extern int iscsi_release_thread_set(struct iscsi_conn *);
  15 extern struct iscsi_conn *iscsi_rx_thread_pre_handler(struct iscsi_thread_set *);
  16 extern struct iscsi_conn *iscsi_tx_thread_pre_handler(struct iscsi_thread_set *);
  17 extern int iscsi_thread_set_init(void);
  18 extern void iscsi_thread_set_free(void);
  19
  20 extern int iscsi_target_tx_thread(void *);
  21 extern 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
  46 struct 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 restarting thread queue */
  68         struct completion       rx_restart_comp;
  69         /* used for restarting thread queue */
  70         struct completion       tx_restart_comp;
  71         /* used for normal unused blocking */
  72         struct completion       rx_start_comp;
  73         /* used for normal unused blocking */
  74         struct completion       tx_start_comp;
  75         /* OS descriptor for rx thread */
  76         struct task_struct      *rx_thread;
  77         /* OS descriptor for tx thread */
  78         struct task_struct      *tx_thread;
  79         /* struct iscsi_thread_set in list list head*/
  80         struct list_head        ts_list;
  81         struct semaphore        ts_activate_sem;
  82 };
  83
  84 #endif   /*** ISCSI_THREAD_QUEUE_H ***/