[deliverable/linux.git] / drivers / infiniband / ulp / srp / ib_srp.h

/*
 * Copyright (c) 2005 Cisco Systems.  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.
 *
 * $Id: ib_srp.h 3932 2005-11-01 17:19:29Z roland $
 */

#ifndef IB_SRP_H
#define IB_SRP_H

#include <linux/types.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/scatterlist.h>

#include <scsi/scsi_host.h>
#include <scsi/scsi_cmnd.h>

#include <rdma/ib_verbs.h>
#include <rdma/ib_sa.h>
#include <rdma/ib_cm.h>

enum {
	SRP_PATH_REC_TIMEOUT_MS	= 1000,
	SRP_ABORT_TIMEOUT_MS	= 5000,

	SRP_PORT_REDIRECT	= 1,
	SRP_DLID_REDIRECT	= 2,

	SRP_MAX_LUN		= 512,
	SRP_MAX_IU_LEN		= 256,

	SRP_RQ_SHIFT    	= 6,
	SRP_RQ_SIZE		= 1 << SRP_RQ_SHIFT,
	SRP_SQ_SIZE		= SRP_RQ_SIZE - 1,
	SRP_CQ_SIZE		= SRP_SQ_SIZE + SRP_RQ_SIZE,

	SRP_TAG_TSK_MGMT	= 1 << (SRP_RQ_SHIFT + 1)
};

#define SRP_OP_RECV		(1 << 31)
#define SRP_MAX_INDIRECT	((SRP_MAX_IU_LEN -			\
				  sizeof (struct srp_cmd) -		\
				  sizeof (struct srp_indirect_buf)) / 16)

enum srp_target_state {
	SRP_TARGET_LIVE,
	SRP_TARGET_CONNECTING,
	SRP_TARGET_DEAD,
	SRP_TARGET_REMOVED
};

struct srp_host {
	u8			initiator_port_id[16];
	struct ib_device       *dev;
	u8                      port;
	struct ib_pd	       *pd;
	struct ib_mr	       *mr;
	struct class_device	class_dev;
	struct list_head	target_list;
	struct mutex            target_mutex;
	struct completion	released;
	struct list_head	list;
};

struct srp_request {
	struct list_head	list;
	struct scsi_cmnd       *scmnd;
	struct srp_iu	       *cmd;
	struct srp_iu	       *tsk_mgmt;
	/*
	 * Fake scatterlist used when scmnd->use_sg==0.  Can be killed
	 * when the SCSI midlayer no longer generates non-SG commands.
	 */
	struct scatterlist	fake_sg;
	struct completion	done;
	short			next;
	u8			cmd_done;
	u8			tsk_status;
};

struct srp_target_port {
	__be64			id_ext;
	__be64			ioc_guid;
	__be64			service_id;
	struct srp_host	       *srp_host;
	struct Scsi_Host       *scsi_host;
	char			target_name[32];
	unsigned int		scsi_id;

	struct ib_sa_path_rec	path;
	struct ib_sa_query     *path_query;
	int			path_query_id;

	struct ib_cm_id	       *cm_id;
	struct ib_cq	       *cq;
	struct ib_qp	       *qp;

	int			max_ti_iu_len;
	s32			req_lim;

	unsigned		rx_head;
	struct srp_iu	       *rx_ring[SRP_RQ_SIZE];

	unsigned		tx_head;
	unsigned		tx_tail;
	struct srp_iu	       *tx_ring[SRP_SQ_SIZE + 1];

	int			req_head;
	struct list_head	req_queue;
	struct srp_request	req_ring[SRP_SQ_SIZE];

	struct work_struct	work;

	struct list_head	list;
	struct completion	done;
	int			status;
	enum srp_target_state	state;
};

struct srp_iu {
	dma_addr_t		dma;
	void		       *buf;
	size_t			size;
	enum dma_data_direction	direction;
};

#endif /* IB_SRP_H */
Commit	Line	Data
aef9ec39 RD	1	/*
	2	* Copyright (c) 2005 Cisco Systems. All rights reserved.
	3	*
	4	* This software is available to you under a choice of one of two
	5	* licenses. You may choose to be licensed under the terms of the GNU
	6	* General Public License (GPL) Version 2, available from the file
	7	* COPYING in the main directory of this source tree, or the
	8	* OpenIB.org BSD license below:
	9	*
	10	* Redistribution and use in source and binary forms, with or
	11	* without modification, are permitted provided that the following
	12	* conditions are met:
	13	*
	14	* - Redistributions of source code must retain the above
	15	* copyright notice, this list of conditions and the following
	16	* disclaimer.
	17	*
	18	* - Redistributions in binary form must reproduce the above
	19	* copyright notice, this list of conditions and the following
	20	* disclaimer in the documentation and/or other materials
	21	* provided with the distribution.
	22	*
	23	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	24	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	25	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	26	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	27	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	28	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	29	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	30	* SOFTWARE.
	31	*
	32	* $Id: ib_srp.h 3932 2005-11-01 17:19:29Z roland $
	33	*/
	34
	35	#ifndef IB_SRP_H
	36	#define IB_SRP_H
	37
	38	#include <linux/types.h>
	39	#include <linux/list.h>
8e9e5f4f	40	#include <linux/mutex.h>
cf368713	41	#include <linux/scatterlist.h>
aef9ec39 RD	42
	43	#include <scsi/scsi_host.h>
	44	#include <scsi/scsi_cmnd.h>
	45
	46	#include <rdma/ib_verbs.h>
	47	#include <rdma/ib_sa.h>
	48	#include <rdma/ib_cm.h>
	49
	50	enum {
	51	SRP_PATH_REC_TIMEOUT_MS = 1000,
	52	SRP_ABORT_TIMEOUT_MS = 5000,
	53
	54	SRP_PORT_REDIRECT = 1,
	55	SRP_DLID_REDIRECT = 2,
	56
5f068992	57	SRP_MAX_LUN = 512,
aef9ec39 RD	58	SRP_MAX_IU_LEN = 256,
	59
	60	SRP_RQ_SHIFT = 6,
	61	SRP_RQ_SIZE = 1 << SRP_RQ_SHIFT,
	62	SRP_SQ_SIZE = SRP_RQ_SIZE - 1,
	63	SRP_CQ_SIZE = SRP_SQ_SIZE + SRP_RQ_SIZE,
	64
	65	SRP_TAG_TSK_MGMT = 1 << (SRP_RQ_SHIFT + 1)
	66	};
	67
	68	#define SRP_OP_RECV (1 << 31)
	69	#define SRP_MAX_INDIRECT ((SRP_MAX_IU_LEN - \
	70	sizeof (struct srp_cmd) - \
	71	sizeof (struct srp_indirect_buf)) / 16)
	72
	73	enum srp_target_state {
	74	SRP_TARGET_LIVE,
	75	SRP_TARGET_CONNECTING,
	76	SRP_TARGET_DEAD,
	77	SRP_TARGET_REMOVED
	78	};
	79
	80	struct srp_host {
	81	u8 initiator_port_id[16];
	82	struct ib_device *dev;
	83	u8 port;
	84	struct ib_pd *pd;
	85	struct ib_mr *mr;
	86	struct class_device class_dev;
	87	struct list_head target_list;
8e9e5f4f	88	struct mutex target_mutex;
aef9ec39 RD	89	struct completion released;
	90	struct list_head list;
	91	};
	92
	93	struct srp_request {
	94	struct list_head list;
	95	struct scsi_cmnd *scmnd;
	96	struct srp_iu *cmd;
	97	struct srp_iu *tsk_mgmt;
cf368713 RD	98	/*
	99	* Fake scatterlist used when scmnd->use_sg==0. Can be killed
	100	* when the SCSI midlayer no longer generates non-SG commands.
	101	*/
	102	struct scatterlist fake_sg;
aef9ec39 RD	103	struct completion done;
	104	short next;
	105	u8 cmd_done;
	106	u8 tsk_status;
	107	};
	108
	109	struct srp_target_port {
	110	__be64 id_ext;
	111	__be64 ioc_guid;
	112	__be64 service_id;
	113	struct srp_host *srp_host;
	114	struct Scsi_Host *scsi_host;
	115	char target_name[32];
	116	unsigned int scsi_id;
	117
	118	struct ib_sa_path_rec path;
	119	struct ib_sa_query *path_query;
	120	int path_query_id;
	121
	122	struct ib_cm_id *cm_id;
	123	struct ib_cq *cq;
	124	struct ib_qp *qp;
	125
	126	int max_ti_iu_len;
	127	s32 req_lim;
	128
	129	unsigned rx_head;
	130	struct srp_iu *rx_ring[SRP_RQ_SIZE];
	131
	132	unsigned tx_head;
	133	unsigned tx_tail;
	134	struct srp_iu *tx_ring[SRP_SQ_SIZE + 1];
	135
	136	int req_head;
	137	struct list_head req_queue;
	138	struct srp_request req_ring[SRP_SQ_SIZE];
	139
	140	struct work_struct work;
	141
	142	struct list_head list;
	143	struct completion done;
	144	int status;
	145	enum srp_target_state state;
	146	};
	147
	148	struct srp_iu {
	149	dma_addr_t dma;
	150	void *buf;
	151	size_t size;
	152	enum dma_data_direction direction;
	153	};
	154
	155	#endif /* IB_SRP_H */