Declarations for tasklet handling.
Signed-off-by: Bob Pearson <rpear...@systemfabricworks.com>
---
drivers/infiniband/hw/rxe/rxe_task.h | 107 +++++++++++++++++++++++++++++++++++
1 file changed, 107 insertions(+)
Index: infiniband/drivers/infiniband/hw/rxe/rxe_task.h
===================================================================
--- /dev/null
+++ infiniband/drivers/infiniband/hw/rxe/rxe_task.h
@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2009-2011 Mellanox Technologies Ltd. All rights reserved.
+ * Copyright (c) 2009-2011 System Fabric Works, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef RXE_TASK_H
+#define RXE_TASK_H
+
+enum {
+ TASK_STATE_START = 0,
+ TASK_STATE_BUSY = 1,
+ TASK_STATE_ARMED = 2,
+};
+
+/*
+ * 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 {
+ void *obj;
+ int *fast;
+ struct tasklet_struct tasklet;
+ int state;
+ spinlock_t state_lock;
+ void *arg;
+ int (*func)(void *arg);
+ int ret;
+ char name[16];
+};
+
+/*
+ * init rxe_task structure
+ * fast => address of control flag, likely a module parameter
+ * arg => parameter to pass to fcn
+ * fcn => function to call until it returns != 0
+ */
+int rxe_init_task(void *obj, struct rxe_task *task, int *fast,
+ void *arg, int (*func)(void *), char *name);
+
+/*
+ * cleanup task
+ */
+void rxe_cleanup_task(struct rxe_task *task);
+
+/*
+ * raw call to func in loop without any checking
+ * can call when tasklets are disabled
+ */
+int __rxe_do_task(struct rxe_task *task);
+
+/*
+ * common function called by any of the main tasklets
+ * if someone is calling the function on its own
+ * thread (fast path) then they must increment busy
+ * If there is any chance that there is additional
+ * work to do someone must reschedule the task before
+ * leaving
+ */
+void rxe_do_task(unsigned long data);
+
+/*
+ * run a task, use fast path if no one else
+ * is currently running it and fast path is ok
+ * else schedule it to run as a tasklet
+ */
+void rxe_run_task(struct rxe_task *task, int sched);
+
+/*
+ * 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 */
--
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