drivers/infiniband/sw/rxe/rxe_task.h

   1 /* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
   2 /*
   3  * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
   4  * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
   5  */
   6
   7 #ifndef RXE_TASK_H
   8 #define RXE_TASK_H
   9
  10 enum {
  11         TASK_STATE_START        = 0,
  12         TASK_STATE_BUSY         = 1,
  13         TASK_STATE_ARMED        = 2,
  14 };
  15
  16 /*
  17  * data structure to describe a 'task' which is a short
  18  * function that returns 0 as long as it needs to be
  19  * called again.
  20  */
  21 struct rxe_task {
  22         void                    *obj;
  23         struct tasklet_struct   tasklet;
  24         int                     state;
  25         spinlock_t              state_lock; /* spinlock for task state */
  26         void                    *arg;
  27         int                     (*func)(void *arg);
  28         int                     ret;
  29         char                    name[16];
  30         bool                    destroyed;
  31 };
  32
  33 /*
  34  * init rxe_task structure
  35  *      arg  => parameter to pass to fcn
  36  *      func => function to call until it returns != 0
  37  */
  38 int rxe_init_task(void *obj, struct rxe_task *task,
  39                   void *arg, int (*func)(void *), char *name);
  40
  41 /* cleanup task */
  42 void rxe_cleanup_task(struct rxe_task *task);
  43
  44 /*
  45  * raw call to func in loop without any checking
  46  * can call when tasklets are disabled
  47  */
  48 int __rxe_do_task(struct rxe_task *task);
  49
  50 /*
  51  * common function called by any of the main tasklets
  52  * If there is any chance that there is additional
  53  * work to do someone must reschedule the task before
  54  * leaving
  55  */
  56 void rxe_do_task(struct tasklet_struct *t);
  57
  58 /* run a task, else schedule it to run as a tasklet, The decision
  59  * to run or schedule tasklet is based on the parameter sched.
  60  */
  61 void rxe_run_task(struct rxe_task *task, int sched);
  62
  63 /* keep a task from scheduling */
  64 void rxe_disable_task(struct rxe_task *task);
  65
  66 /* allow task to run */
  67 void rxe_enable_task(struct rxe_task *task);
  68
  69 #endif /* RXE_TASK_H */