/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
/*
 * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
 * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
 */

#ifndef RXE_TASK_H
#define RXE_TASK_H

enum {
        TASK_STATE_IDLE         = 0,
        TASK_STATE_BUSY         = 1,
        TASK_STATE_ARMED        = 2,
        TASK_STATE_DRAINING     = 3,
        TASK_STATE_DRAINED      = 4,
        TASK_STATE_INVALID      = 5,
};

/*
 * data structure to describe a 'task' which is a short
 * function that returns 0 as long as it needs to be
 * called again.
 */
struct rxe_task {
        struct work_struct      work;
        int                     state;
        spinlock_t              lock;
        struct rxe_qp           *qp;
        int                     (*func)(struct rxe_qp *qp);
        int                     ret;
        long                    num_sched;
        long                    num_done;
};

int rxe_alloc_wq(void);

void rxe_destroy_wq(void);

/*
 * init rxe_task structure
 *      qp  => parameter to pass to func
 *      func => function to call until it returns != 0
 */
int rxe_init_task(struct rxe_task *task, struct rxe_qp *qp,
                  int (*func)(struct rxe_qp *));

/* cleanup task */
void rxe_cleanup_task(struct rxe_task *task);

void rxe_sched_task(struct rxe_task *task);

/* keep a task from scheduling */
void rxe_disable_task(struct rxe_task *task);

/* allow task to run */
void rxe_enable_task(struct rxe_task *task);

#endif /* RXE_TASK_H */