From patchwork Fri Jul 1 13:18:37 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Robert Pearson X-Patchwork-Id: 938772 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.4) with ESMTP id p61LTcSB014702 for ; Fri, 1 Jul 2011 21:51:40 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757292Ab1GAVQU (ORCPT ); Fri, 1 Jul 2011 17:16:20 -0400 Received: from cdptpa-bc-oedgelb.mail.rr.com ([75.180.133.32]:46833 "EHLO cdptpa-bc-oedgelb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755768Ab1GAVQU (ORCPT ); Fri, 1 Jul 2011 17:16:20 -0400 Received: from cdptpa-bc-oedgelb.mail.rr.com ([10.127.134.103]) by cdptpa-bc-qmta01.mail.rr.com with ESMTP id <20110701210948961.BKRV4947@cdptpa-bc-qmta01.mail.rr.com> for ; Fri, 1 Jul 2011 21:09:48 +0000 Authentication-Results: cdptpa-bc-oedgelb.mail.rr.com smtp.user=fzago@systemfabricworks.com; auth=pass (PLAIN) X-Authority-Analysis: v=1.1 cv=40Z/dbZBr1wgzPkGSf8y7qdCkiWp+M7NvixVUiz+qMg= c=1 sm=0 a=hAzdGUM1iB0A:10 a=ozIaqLvjkoIA:10 a=DCwX0kaxZCiV3mmbfDr8nQ==:17 a=YORvzBCaAAAA:8 a=bC7xisPkAAAA:8 a=rVXxhualHSAfaQkZJ1YA:9 a=f5OrP_9cVeVeUsQDD4oA:7 a=QLxd5cu_Zb8A:10 a=VV2__AUApEoA:10 a=ugFD0rV8N2b-tYO9:21 a=MBjdWYr6ojD6-YEg:21 a=DCwX0kaxZCiV3mmbfDr8nQ==:117 X-Cloudmark-Score: 0 X-Originating-IP: 67.79.195.91 Received: from [67.79.195.91] ([67.79.195.91:49539] helo=[10.0.2.91]) by cdptpa-bc-oedge02.mail.rr.com (envelope-from ) (ecelerity 2.2.3.46 r()) with ESMTPA id E3/08-12017-8573E0E4; Fri, 01 Jul 2011 21:08:40 +0000 Message-Id: <20110701132201.471397768@systemfabricworks.com> References: <20110701131821.928693424@systemfabricworks.com> User-Agent: quilt/0.46-1 Date: Fri, 01 Jul 2011 08:18:37 -0500 From: rpearson@systemfabricworks.com To: linux-rdma@vger.kernel.org Cc: Bob Pearson Subject: [patch 16/44] rxe_task.h Content-Disposition: inline; filename=patch16 Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter1.kernel.org [140.211.167.41]); Fri, 01 Jul 2011 21:51:41 +0000 (UTC) Declarations for tasklet handling. Signed-off-by: Bob Pearson --- 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; + unsigned 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, unsigned 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 */