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