[deliverable/linux.git] / drivers / infiniband / ulp / srpt / ib_srpt.h

/*
 * Copyright (c) 2006 - 2009 Mellanox Technology Inc.  All rights reserved.
 * Copyright (C) 2009 - 2010 Bart Van Assche <bvanassche@acm.org>.
 *
 * 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 IB_SRPT_H
#define IB_SRPT_H

#include <linux/types.h>
#include <linux/list.h>
#include <linux/wait.h>

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

#include <scsi/srp.h>

#include "ib_dm_mad.h"

/*
 * The prefix the ServiceName field must start with in the device management
 * ServiceEntries attribute pair. See also the SRP specification.
 */
#define SRP_SERVICE_NAME_PREFIX		"SRP.T10:"

enum {
	/*
	 * SRP IOControllerProfile attributes for SRP target ports that have
	 * not been defined in <scsi/srp.h>. Source: section B.7, table B.7
	 * in the SRP specification.
	 */
	SRP_PROTOCOL = 0x0108,
	SRP_PROTOCOL_VERSION = 0x0001,
	SRP_IO_SUBCLASS = 0x609e,
	SRP_SEND_TO_IOC = 0x01,
	SRP_SEND_FROM_IOC = 0x02,
	SRP_RDMA_READ_FROM_IOC = 0x08,
	SRP_RDMA_WRITE_FROM_IOC = 0x20,

	/*
	 * srp_login_cmd.req_flags bitmasks. See also table 9 in the SRP
	 * specification.
	 */
	SRP_MTCH_ACTION = 0x03, /* MULTI-CHANNEL ACTION */
	SRP_LOSOLNT = 0x10, /* logout solicited notification */
	SRP_CRSOLNT = 0x20, /* credit request solicited notification */
	SRP_AESOLNT = 0x40, /* asynchronous event solicited notification */

	/*
	 * srp_cmd.sol_nt / srp_tsk_mgmt.sol_not bitmasks. See also tables
	 * 18 and 20 in the SRP specification.
	 */
	SRP_SCSOLNT = 0x02, /* SCSOLNT = successful solicited notification */
	SRP_UCSOLNT = 0x04, /* UCSOLNT = unsuccessful solicited notification */

	/*
	 * srp_rsp.sol_not / srp_t_logout.sol_not bitmasks. See also tables
	 * 16 and 22 in the SRP specification.
	 */
	SRP_SOLNT = 0x01, /* SOLNT = solicited notification */

	/* See also table 24 in the SRP specification. */
	SRP_TSK_MGMT_SUCCESS = 0x00,
	SRP_TSK_MGMT_FUNC_NOT_SUPP = 0x04,
	SRP_TSK_MGMT_FAILED = 0x05,

	/* See also table 21 in the SRP specification. */
	SRP_CMD_SIMPLE_Q = 0x0,
	SRP_CMD_HEAD_OF_Q = 0x1,
	SRP_CMD_ORDERED_Q = 0x2,
	SRP_CMD_ACA = 0x4,

	SRP_LOGIN_RSP_MULTICHAN_NO_CHAN = 0x0,
	SRP_LOGIN_RSP_MULTICHAN_TERMINATED = 0x1,
	SRP_LOGIN_RSP_MULTICHAN_MAINTAINED = 0x2,

	SRPT_DEF_SG_TABLESIZE = 128,
	SRPT_DEF_SG_PER_WQE = 16,

	MIN_SRPT_SQ_SIZE = 16,
	DEF_SRPT_SQ_SIZE = 4096,
	SRPT_RQ_SIZE = 128,
	MIN_SRPT_SRQ_SIZE = 4,
	DEFAULT_SRPT_SRQ_SIZE = 4095,
	MAX_SRPT_SRQ_SIZE = 65535,
	MAX_SRPT_RDMA_SIZE = 1U << 24,
	MAX_SRPT_RSP_SIZE = 1024,

	MIN_MAX_REQ_SIZE = 996,
	DEFAULT_MAX_REQ_SIZE
		= sizeof(struct srp_cmd)/*48*/
		+ sizeof(struct srp_indirect_buf)/*20*/
		+ 128 * sizeof(struct srp_direct_buf)/*16*/,

	MIN_MAX_RSP_SIZE = sizeof(struct srp_rsp)/*36*/ + 4,
	DEFAULT_MAX_RSP_SIZE = 256, /* leaves 220 bytes for sense data */

	DEFAULT_MAX_RDMA_SIZE = 65536,
};

/**
 * enum srpt_command_state - SCSI command state managed by SRPT.
 * @SRPT_STATE_NEW:           New command arrived and is being processed.
 * @SRPT_STATE_NEED_DATA:     Processing a write or bidir command and waiting
 *                            for data arrival.
 * @SRPT_STATE_DATA_IN:       Data for the write or bidir command arrived and is
 *                            being processed.
 * @SRPT_STATE_CMD_RSP_SENT:  SRP_RSP for SRP_CMD has been sent.
 * @SRPT_STATE_MGMT:          Processing a SCSI task management command.
 * @SRPT_STATE_MGMT_RSP_SENT: SRP_RSP for SRP_TSK_MGMT has been sent.
 * @SRPT_STATE_DONE:          Command processing finished successfully, command
 *                            processing has been aborted or command processing
 *                            failed.
 */
enum srpt_command_state {
	SRPT_STATE_NEW		 = 0,
	SRPT_STATE_NEED_DATA	 = 1,
	SRPT_STATE_DATA_IN	 = 2,
	SRPT_STATE_CMD_RSP_SENT	 = 3,
	SRPT_STATE_MGMT		 = 4,
	SRPT_STATE_MGMT_RSP_SENT = 5,
	SRPT_STATE_DONE		 = 6,
};

/**
 * struct srpt_ioctx - Shared SRPT I/O context information.
 * @buf:   Pointer to the buffer.
 * @dma:   DMA address of the buffer.
 * @index: Index of the I/O context in its ioctx_ring array.
 */
struct srpt_ioctx {
	struct ib_cqe		cqe;
	void			*buf;
	dma_addr_t		dma;
	uint32_t		index;
};

/**
 * struct srpt_recv_ioctx - SRPT receive I/O context.
 * @ioctx:     See above.
 * @wait_list: Node for insertion in srpt_rdma_ch.cmd_wait_list.
 */
struct srpt_recv_ioctx {
	struct srpt_ioctx	ioctx;
	struct list_head	wait_list;
};

/**
 * struct srpt_send_ioctx - SRPT send I/O context.
 * @ioctx:       See above.
 * @ch:          Channel pointer.
 * @free_list:   Node in srpt_rdma_ch.free_list.
 * @n_rbuf:      Number of data buffers in the received SRP command.
 * @rbufs:       Pointer to SRP data buffer array.
 * @single_rbuf: SRP data buffer if the command has only a single buffer.
 * @sg:          Pointer to sg-list associated with this I/O context.
 * @sg_cnt:      SG-list size.
 * @mapped_sg_count: ib_dma_map_sg() return value.
 * @n_rdma_wrs:  Number of elements in the rdma_wrs array.
 * @rdma_wrs:    Array with information about the RDMA mapping.
 * @tag:         Tag of the received SRP information unit.
 * @spinlock:    Protects 'state'.
 * @state:       I/O context state.
 * @cmd:         Target core command data structure.
 * @sense_data:  SCSI sense data.
 */
struct srpt_send_ioctx {
	struct srpt_ioctx	ioctx;
	struct srpt_rdma_ch	*ch;
	struct ib_rdma_wr	*rdma_wrs;
	struct ib_cqe		rdma_cqe;
	struct srp_direct_buf	*rbufs;
	struct srp_direct_buf	single_rbuf;
	struct scatterlist	*sg;
	struct list_head	free_list;
	spinlock_t		spinlock;
	enum srpt_command_state	state;
	struct se_cmd		cmd;
	struct completion	tx_done;
	int			sg_cnt;
	int			mapped_sg_count;
	u16			n_rdma_wrs;
	u8			n_rdma;
	u8			n_rbuf;
	bool			queue_status_only;
	u8			sense_data[TRANSPORT_SENSE_BUFFER];
};

/**
 * enum rdma_ch_state - SRP channel state.
 * @CH_CONNECTING:    QP is in RTR state; waiting for RTU.
 * @CH_LIVE:	      QP is in RTS state.
 * @CH_DISCONNECTING: DREQ has been sent and waiting for DREP or DREQ has
 *                    been received.
 * @CH_DRAINING:      DREP has been received or waiting for DREP timed out
 *                    and last work request has been queued.
 * @CH_DISCONNECTED:  Last completion has been received.
 */
enum rdma_ch_state {
	CH_CONNECTING,
	CH_LIVE,
	CH_DISCONNECTING,
	CH_DRAINING,
	CH_DISCONNECTED,
};

/**
 * struct srpt_rdma_ch - RDMA channel.
 * @cm_id:         IB CM ID associated with the channel.
 * @qp:            IB queue pair used for communicating over this channel.
 * @cq:            IB completion queue for this channel.
 * @rq_size:       IB receive queue size.
 * @rsp_size	   IB response message size in bytes.
 * @sq_wr_avail:   number of work requests available in the send queue.
 * @sport:         pointer to the information of the HCA port used by this
 *                 channel.
 * @i_port_id:     128-bit initiator port identifier copied from SRP_LOGIN_REQ.
 * @t_port_id:     128-bit target port identifier copied from SRP_LOGIN_REQ.
 * @max_ti_iu_len: maximum target-to-initiator information unit length.
 * @req_lim:       request limit: maximum number of requests that may be sent
 *                 by the initiator without having received a response.
 * @req_lim_delta: Number of credits not yet sent back to the initiator.
 * @spinlock:      Protects free_list and state.
 * @free_list:     Head of list with free send I/O contexts.
 * @state:         channel state. See also enum rdma_ch_state.
 * @ioctx_ring:    Send ring.
 * @list:          Node for insertion in the srpt_device.rch_list list.
 * @cmd_wait_list: List of SCSI commands that arrived before the RTU event. This
 *                 list contains struct srpt_ioctx elements and is protected
 *                 against concurrent modification by the cm_id spinlock.
 * @sess:          Session information associated with this SRP channel.
 * @sess_name:     Session name.
 * @release_work:  Allows scheduling of srpt_release_channel().
 * @release_done:  Enables waiting for srpt_release_channel() completion.
 */
struct srpt_rdma_ch {
	struct ib_cm_id		*cm_id;
	struct ib_qp		*qp;
	struct ib_cq		*cq;
	struct ib_cqe		zw_cqe;
	struct kref		kref;
	int			rq_size;
	u32			rsp_size;
	atomic_t		sq_wr_avail;
	struct srpt_port	*sport;
	u8			i_port_id[16];
	u8			t_port_id[16];
	int			max_ti_iu_len;
	atomic_t		req_lim;
	atomic_t		req_lim_delta;
	spinlock_t		spinlock;
	struct list_head	free_list;
	enum rdma_ch_state	state;
	struct srpt_send_ioctx	**ioctx_ring;
	struct list_head	list;
	struct list_head	cmd_wait_list;
	struct se_session	*sess;
	u8			sess_name[36];
	struct work_struct	release_work;
	struct completion	*release_done;
};

/**
 * struct srpt_port_attib - Attributes for SRPT port
 * @srp_max_rdma_size: Maximum size of SRP RDMA transfers for new connections.
 * @srp_max_rsp_size: Maximum size of SRP response messages in bytes.
 * @srp_sq_size: Shared receive queue (SRQ) size.
 */
struct srpt_port_attrib {
	u32			srp_max_rdma_size;
	u32			srp_max_rsp_size;
	u32			srp_sq_size;
};

/**
 * struct srpt_port - Information associated by SRPT with a single IB port.
 * @sdev:      backpointer to the HCA information.
 * @mad_agent: per-port management datagram processing information.
 * @enabled:   Whether or not this target port is enabled.
 * @port_guid: ASCII representation of Port GUID
 * @port:      one-based port number.
 * @sm_lid:    cached value of the port's sm_lid.
 * @lid:       cached value of the port's lid.
 * @gid:       cached value of the port's gid.
 * @port_acl_lock spinlock for port_acl_list:
 * @work:      work structure for refreshing the aforementioned cached values.
 * @port_tpg_1 Target portal group = 1 data.
 * @port_wwn:  Target core WWN data.
 * @port_acl_list: Head of the list with all node ACLs for this port.
 */
struct srpt_port {
	struct srpt_device	*sdev;
	struct ib_mad_agent	*mad_agent;
	bool			enabled;
	u8			port_guid[64];
	u8			port;
	u16			sm_lid;
	u16			lid;
	union ib_gid		gid;
	struct work_struct	work;
	struct se_portal_group	port_tpg_1;
	struct se_wwn		port_wwn;
	struct srpt_port_attrib port_attrib;
};

/**
 * struct srpt_device - Information associated by SRPT with a single HCA.
 * @device:        Backpointer to the struct ib_device managed by the IB core.
 * @pd:            IB protection domain.
 * @mr:            L_Key (local key) with write access to all local memory.
 * @srq:           Per-HCA SRQ (shared receive queue).
 * @cm_id:         Connection identifier.
 * @srq_size:      SRQ size.
 * @ioctx_ring:    Per-HCA SRQ.
 * @rch_list:      Per-device channel list -- see also srpt_rdma_ch.list.
 * @ch_releaseQ:   Enables waiting for removal from rch_list.
 * @mutex:         Protects rch_list.
 * @port:          Information about the ports owned by this HCA.
 * @event_handler: Per-HCA asynchronous IB event handler.
 * @list:          Node in srpt_dev_list.
 */
struct srpt_device {
	struct ib_device	*device;
	struct ib_pd		*pd;
	struct ib_srq		*srq;
	struct ib_cm_id		*cm_id;
	int			srq_size;
	struct srpt_recv_ioctx	**ioctx_ring;
	struct list_head	rch_list;
	wait_queue_head_t	ch_releaseQ;
	struct mutex		mutex;
	struct srpt_port	port[2];
	struct ib_event_handler	event_handler;
	struct list_head	list;
};

#endif				/* IB_SRPT_H */
Commit	Line	Data
a42d985b BVA	1	/*
	2	* Copyright (c) 2006 - 2009 Mellanox Technology Inc. All rights reserved.
	3	* Copyright (C) 2009 - 2010 Bart Van Assche <bvanassche@acm.org>.
	4	*
	5	* This software is available to you under a choice of one of two
	6	* licenses. You may choose to be licensed under the terms of the GNU
	7	* General Public License (GPL) Version 2, available from the file
	8	* COPYING in the main directory of this source tree, or the
	9	* OpenIB.org BSD license below:
	10	*
	11	* Redistribution and use in source and binary forms, with or
	12	* without modification, are permitted provided that the following
	13	* conditions are met:
	14	*
	15	* - Redistributions of source code must retain the above
	16	* copyright notice, this list of conditions and the following
	17	* disclaimer.
	18	*
	19	* - Redistributions in binary form must reproduce the above
	20	* copyright notice, this list of conditions and the following
	21	* disclaimer in the documentation and/or other materials
	22	* provided with the distribution.
	23	*
	24	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	25	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	26	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	27	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	28	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	29	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	30	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	31	* SOFTWARE.
	32	*
	33	*/
	34
	35	#ifndef IB_SRPT_H
	36	#define IB_SRPT_H
	37
a42d985b BVA	38	#include <linux/types.h>
	39	#include <linux/list.h>
	40	#include <linux/wait.h>
	41
	42	#include <rdma/ib_verbs.h>
	43	#include <rdma/ib_sa.h>
	44	#include <rdma/ib_cm.h>
	45
	46	#include <scsi/srp.h>
	47
	48	#include "ib_dm_mad.h"
	49
	50	/*
	51	* The prefix the ServiceName field must start with in the device management
	52	* ServiceEntries attribute pair. See also the SRP specification.
	53	*/
	54	#define SRP_SERVICE_NAME_PREFIX "SRP.T10:"
	55
	56	enum {
	57	/*
	58	* SRP IOControllerProfile attributes for SRP target ports that have
	59	* not been defined in <scsi/srp.h>. Source: section B.7, table B.7
	60	* in the SRP specification.
	61	*/
	62	SRP_PROTOCOL = 0x0108,
	63	SRP_PROTOCOL_VERSION = 0x0001,
	64	SRP_IO_SUBCLASS = 0x609e,
	65	SRP_SEND_TO_IOC = 0x01,
	66	SRP_SEND_FROM_IOC = 0x02,
	67	SRP_RDMA_READ_FROM_IOC = 0x08,
	68	SRP_RDMA_WRITE_FROM_IOC = 0x20,
	69
	70	/*
	71	* srp_login_cmd.req_flags bitmasks. See also table 9 in the SRP
	72	* specification.
	73	*/
	74	SRP_MTCH_ACTION = 0x03, /* MULTI-CHANNEL ACTION */
	75	SRP_LOSOLNT = 0x10, /* logout solicited notification */
	76	SRP_CRSOLNT = 0x20, /* credit request solicited notification */
	77	SRP_AESOLNT = 0x40, /* asynchronous event solicited notification */
	78
	79	/*
	80	* srp_cmd.sol_nt / srp_tsk_mgmt.sol_not bitmasks. See also tables
	81	* 18 and 20 in the SRP specification.
	82	*/
	83	SRP_SCSOLNT = 0x02, /* SCSOLNT = successful solicited notification */
	84	SRP_UCSOLNT = 0x04, /* UCSOLNT = unsuccessful solicited notification */
	85
	86	/*
	87	* srp_rsp.sol_not / srp_t_logout.sol_not bitmasks. See also tables
	88	* 16 and 22 in the SRP specification.
	89	*/
	90	SRP_SOLNT = 0x01, /* SOLNT = solicited notification */
	91
	92	/* See also table 24 in the SRP specification. */
	93	SRP_TSK_MGMT_SUCCESS = 0x00,
	94	SRP_TSK_MGMT_FUNC_NOT_SUPP = 0x04,
	95	SRP_TSK_MGMT_FAILED = 0x05,
	96
	97	/* See also table 21 in the SRP specification. */
	98	SRP_CMD_SIMPLE_Q = 0x0,
	99	SRP_CMD_HEAD_OF_Q = 0x1,
	100	SRP_CMD_ORDERED_Q = 0x2,
	101	SRP_CMD_ACA = 0x4,
102
103	SRP_LOGIN_RSP_MULTICHAN_NO_CHAN = 0x0,
104	SRP_LOGIN_RSP_MULTICHAN_TERMINATED = 0x1,
105	SRP_LOGIN_RSP_MULTICHAN_MAINTAINED = 0x2,
106
107	SRPT_DEF_SG_TABLESIZE = 128,
108	SRPT_DEF_SG_PER_WQE = 16,
109
110	MIN_SRPT_SQ_SIZE = 16,
111	DEF_SRPT_SQ_SIZE = 4096,
112	SRPT_RQ_SIZE = 128,
113	MIN_SRPT_SRQ_SIZE = 4,
114	DEFAULT_SRPT_SRQ_SIZE = 4095,
115	MAX_SRPT_SRQ_SIZE = 65535,
116	MAX_SRPT_RDMA_SIZE = 1U << 24,
117	MAX_SRPT_RSP_SIZE = 1024,
118
119	MIN_MAX_REQ_SIZE = 996,
120	DEFAULT_MAX_REQ_SIZE
121	= sizeof(struct srp_cmd)/48/
122	+ sizeof(struct srp_indirect_buf)/20/
123	+ 128 * sizeof(struct srp_direct_buf)/16/,
124
125	MIN_MAX_RSP_SIZE = sizeof(struct srp_rsp)/36/ + 4,
126	DEFAULT_MAX_RSP_SIZE = 256, /* leaves 220 bytes for sense data */
127
128	DEFAULT_MAX_RDMA_SIZE = 65536,
129	};
130
a42d985b BVA	131	/**
	132	* enum srpt_command_state - SCSI command state managed by SRPT.
	133	* @SRPT_STATE_NEW: New command arrived and is being processed.
	134	* @SRPT_STATE_NEED_DATA: Processing a write or bidir command and waiting
	135	* for data arrival.
	136	* @SRPT_STATE_DATA_IN: Data for the write or bidir command arrived and is
	137	* being processed.
	138	* @SRPT_STATE_CMD_RSP_SENT: SRP_RSP for SRP_CMD has been sent.
	139	* @SRPT_STATE_MGMT: Processing a SCSI task management command.
	140	* @SRPT_STATE_MGMT_RSP_SENT: SRP_RSP for SRP_TSK_MGMT has been sent.
	141	* @SRPT_STATE_DONE: Command processing finished successfully, command
	142	* processing has been aborted or command processing
	143	* failed.
	144	*/
	145	enum srpt_command_state {
	146	SRPT_STATE_NEW = 0,
	147	SRPT_STATE_NEED_DATA = 1,
	148	SRPT_STATE_DATA_IN = 2,
	149	SRPT_STATE_CMD_RSP_SENT = 3,
	150	SRPT_STATE_MGMT = 4,
	151	SRPT_STATE_MGMT_RSP_SENT = 5,
	152	SRPT_STATE_DONE = 6,
	153	};
	154
	155	/**
	156	* struct srpt_ioctx - Shared SRPT I/O context information.
	157	* @buf: Pointer to the buffer.
	158	* @dma: DMA address of the buffer.
	159	* @index: Index of the I/O context in its ioctx_ring array.
	160	*/
	161	struct srpt_ioctx {
59fae4de	162	struct ib_cqe cqe;
a42d985b BVA	163	void *buf;
	164	dma_addr_t dma;
	165	uint32_t index;
	166	};
	167
	168	/**
	169	* struct srpt_recv_ioctx - SRPT receive I/O context.
	170	* @ioctx: See above.
	171	* @wait_list: Node for insertion in srpt_rdma_ch.cmd_wait_list.
	172	*/
	173	struct srpt_recv_ioctx {
	174	struct srpt_ioctx ioctx;
	175	struct list_head wait_list;
	176	};
	177
	178	/**
	179	* struct srpt_send_ioctx - SRPT send I/O context.
	180	* @ioctx: See above.
	181	* @ch: Channel pointer.
3c968887	182	* @free_list: Node in srpt_rdma_ch.free_list.
a42d985b BVA	183	* @n_rbuf: Number of data buffers in the received SRP command.
	184	* @rbufs: Pointer to SRP data buffer array.
	185	* @single_rbuf: SRP data buffer if the command has only a single buffer.
	186	* @sg: Pointer to sg-list associated with this I/O context.
	187	* @sg_cnt: SG-list size.
	188	* @mapped_sg_count: ib_dma_map_sg() return value.
59fae4de CH	189	* @n_rdma_wrs: Number of elements in the rdma_wrs array.
59fae4de CH	190	* @rdma_wrs: Array with information about the RDMA mapping.
a42d985b BVA	191	* @tag: Tag of the received SRP information unit.
	192	* @spinlock: Protects 'state'.
	193	* @state: I/O context state.
a42d985b BVA	194	* @cmd: Target core command data structure.
	195	* @sense_data: SCSI sense data.
	196	*/
	197	struct srpt_send_ioctx {
	198	struct srpt_ioctx ioctx;
	199	struct srpt_rdma_ch *ch;
59fae4de CH	200	struct ib_rdma_wr *rdma_wrs;
59fae4de CH	201	struct ib_cqe rdma_cqe;
a42d985b BVA	202	struct srp_direct_buf *rbufs;
	203	struct srp_direct_buf single_rbuf;
	204	struct scatterlist *sg;
3c968887	205	struct list_head free_list;
a42d985b BVA	206	spinlock_t spinlock;
a42d985b BVA	207	enum srpt_command_state state;
a42d985b BVA	208	struct se_cmd cmd;
a42d985b BVA	209	struct completion tx_done;
a42d985b BVA	210	int sg_cnt;
a42d985b BVA	211	int mapped_sg_count;
59fae4de	212	u16 n_rdma_wrs;
a42d985b BVA	213	u8 n_rdma;
	214	u8 n_rbuf;
	215	bool queue_status_only;
ba929992	216	u8 sense_data[TRANSPORT_SENSE_BUFFER];
a42d985b BVA	217	};
	218
	219	/**
	220	* enum rdma_ch_state - SRP channel state.
aaf45bd8 BVA	221	* @CH_CONNECTING: QP is in RTR state; waiting for RTU.
	222	* @CH_LIVE: QP is in RTS state.
	223	* @CH_DISCONNECTING: DREQ has been sent and waiting for DREP or DREQ has
	224	* been received.
	225	* @CH_DRAINING: DREP has been received or waiting for DREP timed out
	226	* and last work request has been queued.
	227	* @CH_DISCONNECTED: Last completion has been received.
a42d985b BVA	228	*/
	229	enum rdma_ch_state {
	230	CH_CONNECTING,
	231	CH_LIVE,
	232	CH_DISCONNECTING,
	233	CH_DRAINING,
aaf45bd8	234	CH_DISCONNECTED,
a42d985b BVA	235	};
	236
	237	/**
	238	* struct srpt_rdma_ch - RDMA channel.
a42d985b BVA	239	* @cm_id: IB CM ID associated with the channel.
	240	* @qp: IB queue pair used for communicating over this channel.
	241	* @cq: IB completion queue for this channel.
	242	* @rq_size: IB receive queue size.
	243	* @rsp_size IB response message size in bytes.
	244	* @sq_wr_avail: number of work requests available in the send queue.
	245	* @sport: pointer to the information of the HCA port used by this
	246	* channel.
	247	* @i_port_id: 128-bit initiator port identifier copied from SRP_LOGIN_REQ.
	248	* @t_port_id: 128-bit target port identifier copied from SRP_LOGIN_REQ.
	249	* @max_ti_iu_len: maximum target-to-initiator information unit length.
	250	* @req_lim: request limit: maximum number of requests that may be sent
	251	* by the initiator without having received a response.
	252	* @req_lim_delta: Number of credits not yet sent back to the initiator.
	253	* @spinlock: Protects free_list and state.
	254	* @free_list: Head of list with free send I/O contexts.
	255	* @state: channel state. See also enum rdma_ch_state.
	256	* @ioctx_ring: Send ring.
a42d985b BVA	257	* @list: Node for insertion in the srpt_device.rch_list list.
	258	* @cmd_wait_list: List of SCSI commands that arrived before the RTU event. This
	259	* list contains struct srpt_ioctx elements and is protected
	260	* against concurrent modification by the cm_id spinlock.
	261	* @sess: Session information associated with this SRP channel.
	262	* @sess_name: Session name.
	263	* @release_work: Allows scheduling of srpt_release_channel().
	264	* @release_done: Enables waiting for srpt_release_channel() completion.
	265	*/
	266	struct srpt_rdma_ch {
a42d985b BVA	267	struct ib_cm_id *cm_id;
	268	struct ib_qp *qp;
	269	struct ib_cq *cq;
aaf45bd8 BVA	270	struct ib_cqe zw_cqe;
aaf45bd8 BVA	271	struct kref kref;
a42d985b BVA	272	int rq_size;
	273	u32 rsp_size;
	274	atomic_t sq_wr_avail;
	275	struct srpt_port *sport;
	276	u8 i_port_id[16];
	277	u8 t_port_id[16];
	278	int max_ti_iu_len;
	279	atomic_t req_lim;
	280	atomic_t req_lim_delta;
	281	spinlock_t spinlock;
	282	struct list_head free_list;
	283	enum rdma_ch_state state;
	284	struct srpt_send_ioctx **ioctx_ring;
a42d985b BVA	285	struct list_head list;
	286	struct list_head cmd_wait_list;
	287	struct se_session *sess;
	288	u8 sess_name[36];
	289	struct work_struct release_work;
	290	struct completion *release_done;
	291	};
	292
	293	/**
	294	* struct srpt_port_attib - Attributes for SRPT port
	295	* @srp_max_rdma_size: Maximum size of SRP RDMA transfers for new connections.
	296	* @srp_max_rsp_size: Maximum size of SRP response messages in bytes.
	297	* @srp_sq_size: Shared receive queue (SRQ) size.
	298	*/
	299	struct srpt_port_attrib {
	300	u32 srp_max_rdma_size;
	301	u32 srp_max_rsp_size;
	302	u32 srp_sq_size;
	303	};
	304
	305	/**
	306	* struct srpt_port - Information associated by SRPT with a single IB port.
	307	* @sdev: backpointer to the HCA information.
	308	* @mad_agent: per-port management datagram processing information.
	309	* @enabled: Whether or not this target port is enabled.
	310	* @port_guid: ASCII representation of Port GUID
	311	* @port: one-based port number.
	312	* @sm_lid: cached value of the port's sm_lid.
	313	* @lid: cached value of the port's lid.
	314	* @gid: cached value of the port's gid.
	315	* @port_acl_lock spinlock for port_acl_list:
	316	* @work: work structure for refreshing the aforementioned cached values.
	317	* @port_tpg_1 Target portal group = 1 data.
	318	* @port_wwn: Target core WWN data.
	319	* @port_acl_list: Head of the list with all node ACLs for this port.
	320	*/
	321	struct srpt_port {
	322	struct srpt_device *sdev;
	323	struct ib_mad_agent *mad_agent;
	324	bool enabled;
	325	u8 port_guid[64];
	326	u8 port;
	327	u16 sm_lid;
	328	u16 lid;
	329	union ib_gid gid;
a42d985b BVA	330	struct work_struct work;
	331	struct se_portal_group port_tpg_1;
	332	struct se_wwn port_wwn;
a42d985b BVA	333	struct srpt_port_attrib port_attrib;
	334	};
	335
	336	/**
	337	* struct srpt_device - Information associated by SRPT with a single HCA.
	338	* @device: Backpointer to the struct ib_device managed by the IB core.
	339	* @pd: IB protection domain.
	340	* @mr: L_Key (local key) with write access to all local memory.
	341	* @srq: Per-HCA SRQ (shared receive queue).
	342	* @cm_id: Connection identifier.
a42d985b BVA	343	* @srq_size: SRQ size.
	344	* @ioctx_ring: Per-HCA SRQ.
	345	* @rch_list: Per-device channel list -- see also srpt_rdma_ch.list.
	346	* @ch_releaseQ: Enables waiting for removal from rch_list.
8628991f	347	* @mutex: Protects rch_list.
a42d985b BVA	348	* @port: Information about the ports owned by this HCA.
	349	* @event_handler: Per-HCA asynchronous IB event handler.
	350	* @list: Node in srpt_dev_list.
	351	*/
	352	struct srpt_device {
	353	struct ib_device *device;
	354	struct ib_pd *pd;
a42d985b BVA	355	struct ib_srq *srq;
a42d985b BVA	356	struct ib_cm_id *cm_id;
a42d985b BVA	357	int srq_size;
	358	struct srpt_recv_ioctx **ioctx_ring;
	359	struct list_head rch_list;
	360	wait_queue_head_t ch_releaseQ;
8628991f	361	struct mutex mutex;
a42d985b BVA	362	struct srpt_port port[2];
	363	struct ib_event_handler event_handler;
	364	struct list_head list;
	365	};
	366
a42d985b	367	#endif /* IB_SRPT_H */