/*
* 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_opcode {
SRPT_RECV,
SRPT_SEND,
SRPT_RDMA_MID,
SRPT_RDMA_ABORT,
SRPT_RDMA_READ_LAST,
SRPT_RDMA_WRITE_LAST,
};
static inline u64 encode_wr_id(u8 opcode, u32 idx)
{
return ((u64)opcode << 32) | idx;
}
static inline enum srpt_opcode opcode_from_wr_id(u64 wr_id)
{
return wr_id >> 32;
}
static inline u32 idx_from_wr_id(u64 wr_id)
{
return (u32)wr_id;
}
struct rdma_iu {
u64 raddr;
u32 rkey;
struct ib_sge *sge;
u32 sge_cnt;
int mem_id;
};
/**
* 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 {
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_ius: Number of elements in the rdma_ius array.
* @rdma_ius: Array with information about the RDMA mapping.
* @tag: Tag of the received SRP information unit.
* @spinlock: Protects 'state'.
* @state: I/O context state.
* @rdma_aborted: If initiating a multipart RDMA transfer failed, whether
* the already initiated transfers have finished.
* @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 kref kref;
struct rdma_iu *rdma_ius;
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;
bool rdma_aborted;
struct se_cmd cmd;
struct completion tx_done;
u64 tag;
int sg_cnt;
int mapped_sg_count;
u16 n_rdma_ius;
u8 n_rdma;
u8 n_rbuf;
bool queue_status_only;
u8 sense_data[SCSI_SENSE_BUFFERSIZE];
};
/**
* 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 received; waiting for DREP
* or DREQ has been send and waiting for DREP
* or .
* @CH_DRAINING: QP is in ERR state; waiting for last WQE event.
* @CH_RELEASING: Last WQE event has been received; releasing resources.
*/
enum rdma_ch_state {
CH_CONNECTING,
CH_LIVE,
CH_DISCONNECTING,
CH_DRAINING,
CH_RELEASING
};
/**
* struct srpt_rdma_ch - RDMA channel.
* @wait_queue: Allows the kernel thread to wait for more work.
* @thread: Kernel thread that processes the IB queues associated with
* the 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.
* @wc: IB work completion array for srpt_process_completion().
* @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 {
wait_queue_head_t wait_queue;
struct task_struct *thread;
struct ib_cm_id *cm_id;
struct ib_qp *qp;
struct ib_cq *cq;
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 ib_wc wc[16];
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;
spinlock_t port_acl_lock;
struct work_struct work;
struct se_portal_group port_tpg_1;
struct se_wwn port_wwn;
struct list_head port_acl_list;
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.
* @dev_attr: Attributes of the InfiniBand device as obtained during the
* ib_client.add() callback.
* @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.
* @spinlock: Protects rch_list and tpg.
* @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_mr *mr;
struct ib_srq *srq;
struct ib_cm_id *cm_id;
struct ib_device_attr dev_attr;
int srq_size;
struct srpt_recv_ioctx **ioctx_ring;
struct list_head rch_list;
wait_queue_head_t ch_releaseQ;
spinlock_t spinlock;
struct srpt_port port[2];
struct ib_event_handler event_handler;
struct list_head list;
};
/**
* struct srpt_node_acl - Per-initiator ACL data (managed via configfs).
* @i_port_id: 128-bit SRP initiator port ID.
* @sport: port information.
* @nacl: Target core node ACL information.
* @list: Element of the per-HCA ACL list.
*/
struct srpt_node_acl {
u8 i_port_id[16];
struct srpt_port *sport;
struct se_node_acl nacl;
struct list_head list;
};
/*
* SRP-releated SCSI persistent reservation definitions.
*
* See also SPC4r28, section 7.6.1 (Protocol specific parameters introduction).
* See also SPC4r28, section 7.6.4.5 (TransportID for initiator ports using
* SCSI over an RDMA interface).
*/
enum {
SCSI_TRANSPORTID_PROTOCOLID_SRP = 4,
};
struct spc_rdma_transport_id {
uint8_t protocol_identifier;
uint8_t reserved[7];
uint8_t i_port_id[16];
};
#endif /* IB_SRPT_H */