/* * 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 <rdma/rdma_cm.h> #include <rdma/rw.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:" struct srpt_nexus; 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, SRPT_DEF_SG_TABLESIZE = 128, MIN_SRPT_SQ_SIZE = 16, DEF_SRPT_SQ_SIZE = 4096, MAX_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, SRP_MAX_ADD_CDB_LEN = 16, SRP_MAX_IMM_DATA_OFFSET = 80, SRP_MAX_IMM_DATA = 8 * 1024, MIN_MAX_REQ_SIZE = 996, DEFAULT_MAX_REQ_SIZE_1 = sizeof(struct srp_cmd)/*48*/ + SRP_MAX_ADD_CDB_LEN + sizeof(struct srp_indirect_buf)/*20*/ + 128 * sizeof(struct srp_direct_buf)/*16*/, DEFAULT_MAX_REQ_SIZE_2 = SRP_MAX_IMM_DATA_OFFSET + sizeof(struct srp_imm_buf) + SRP_MAX_IMM_DATA, DEFAULT_MAX_REQ_SIZE = DEFAULT_MAX_REQ_SIZE_1 > DEFAULT_MAX_REQ_SIZE_2 ? DEFAULT_MAX_REQ_SIZE_1 : DEFAULT_MAX_REQ_SIZE_2, 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 * @cqe: Completion queue element. * @buf: Pointer to the buffer. * @dma: DMA address of the buffer. * @offset: Offset of the first byte in @buf and @dma that is actually used. * @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 offset; 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. * @byte_len: Number of bytes in @ioctx.buf. */ struct srpt_recv_ioctx { struct srpt_ioctx ioctx; struct list_head wait_list; int byte_len; }; struct srpt_rw_ctx { struct rdma_rw_ctx rw; struct scatterlist *sg; unsigned int nents; }; /** * struct srpt_send_ioctx - SRPT send I/O context * @ioctx: See above. * @ch: Channel pointer. * @recv_ioctx: Receive I/O context associated with this send I/O context. * Only used for processing immediate data. * @s_rw_ctx: @rw_ctxs points here if only a single rw_ctx is needed. * @rw_ctxs: RDMA read/write contexts. * @imm_sg: Scatterlist for immediate data. * @rdma_cqe: RDMA completion queue element. * @state: I/O context state. * @cmd: Target core command data structure. * @sense_data: SCSI sense data. * @n_rdma: Number of work requests needed to transfer this ioctx. * @n_rw_ctx: Size of rw_ctxs array. * @queue_status_only: Send a SCSI status back to the initiator but no data. * @sense_data: Sense data to be sent to the initiator. */ struct srpt_send_ioctx { struct srpt_ioctx ioctx; struct srpt_rdma_ch *ch; struct srpt_recv_ioctx *recv_ioctx; struct srpt_rw_ctx s_rw_ctx; struct srpt_rw_ctx *rw_ctxs; struct scatterlist imm_sg; struct ib_cqe rdma_cqe; enum srpt_command_state state; struct se_cmd cmd; u8 n_rdma; u8 n_rw_ctx; 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 * @nexus: I_T nexus this channel is associated with. * @qp: IB queue pair used for communicating over this channel. * @ib_cm: See below. * @ib_cm.cm_id: IB CM ID associated with the channel. * @rdma_cm: See below. * @rdma_cm.cm_id: RDMA CM ID associated with the channel. * @cq: IB completion queue for this channel. * @cq_size: Number of CQEs in @cq. * @zw_cqe: Zero-length write CQE. * @rcu: RCU head. * @kref: kref for this channel. * @closed: Completion object that will be signaled as soon as a new * channel object with the same identity can be created. * @rq_size: IB receive queue size. * @max_rsp_size: Maximum size of an RSP response message 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. * @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. * @imm_data_offset: Offset from start of SRP_CMD for immediate data. * @spinlock: Protects free_list and state. * @state: channel state. See also enum rdma_ch_state. * @using_rdma_cm: Whether the RDMA/CM or IB/CM is used for this channel. * @processing_wait_list: Whether or not cmd_wait_list is being processed. * @rsp_buf_cache: kmem_cache for @ioctx_ring. * @ioctx_ring: Send ring. * @req_buf_cache: kmem_cache for @ioctx_recv_ring. * @ioctx_recv_ring: Receive I/O context ring. * @list: Node in srpt_nexus.ch_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. * @pkey: P_Key of the IB partition for this SRP channel. * @sess: Session information associated with this SRP channel. * @sess_name: Session name. * @release_work: Allows scheduling of srpt_release_channel(). */ struct srpt_rdma_ch { struct srpt_nexus *nexus; struct ib_qp *qp; union { struct { struct ib_cm_id *cm_id; } ib_cm; struct { struct rdma_cm_id *cm_id; } rdma_cm; }; struct ib_cq *cq; u32 cq_size; struct ib_cqe zw_cqe; struct rcu_head rcu; struct kref kref; struct completion *closed; int rq_size; u32 max_rsp_size; atomic_t sq_wr_avail; struct srpt_port *sport; int max_ti_iu_len; atomic_t req_lim; atomic_t req_lim_delta; u16 imm_data_offset; spinlock_t spinlock; enum rdma_ch_state state; struct kmem_cache *rsp_buf_cache; struct srpt_send_ioctx **ioctx_ring; struct kmem_cache *req_buf_cache; struct srpt_recv_ioctx **ioctx_recv_ring; struct list_head list; struct list_head cmd_wait_list; uint16_t pkey; bool using_rdma_cm; bool processing_wait_list; struct se_session *sess; u8 sess_name[40]; struct work_struct release_work; }; /** * struct srpt_nexus - I_T nexus * @rcu: RCU head for this data structure. * @entry: srpt_port.nexus_list list node. * @ch_list: struct srpt_rdma_ch list. Protected by srpt_port.mutex. * @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. */ struct srpt_nexus { struct rcu_head rcu; struct list_head entry; struct list_head ch_list; u8 i_port_id[16]; u8 t_port_id[16]; }; /** * struct srpt_port_attrib - 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. * @use_srq: Whether or not to use SRQ. */ struct srpt_port_attrib { u32 srp_max_rdma_size; u32 srp_max_rsp_size; u32 srp_sq_size; bool use_srq; }; /** * struct srpt_tpg - information about a single "target portal group" * @entry: Entry in @sport_id->tpg_list. * @sport_id: Port name this TPG is associated with. * @tpg: LIO TPG data structure. * * Zero or more target portal groups are associated with each port name * (srpt_port_id). With each TPG an ACL list is associated. */ struct srpt_tpg { struct list_head entry; struct srpt_port_id *sport_id; struct se_portal_group tpg; }; /** * struct srpt_port_id - LIO RDMA port information * @mutex: Protects @tpg_list changes. * @tpg_list: TPGs associated with the RDMA port name. * @wwn: WWN associated with the RDMA port name. * @name: ASCII representation of the port name. * * Multiple sysfs directories can be associated with a single RDMA port. This * data structure represents a single (port, name) pair. */ struct srpt_port_id { struct mutex mutex; struct list_head tpg_list; struct se_wwn wwn; char name[64]; }; /** * struct srpt_port - SRPT RDMA port information * @sdev: backpointer to the HCA information. * @mad_agent: per-port management datagram processing information. * @enabled: Whether or not this target port is enabled. * @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. * @work: work structure for refreshing the aforementioned cached values. * @guid_name: port name in GUID format. * @guid_id: LIO target port information for the port name in GUID format. * @gid_name: port name in GID format. * @gid_id: LIO target port information for the port name in GID format. * @port_attrib: Port attributes that can be accessed through configfs. * @refcount: Number of objects associated with this port. * @freed_channels: Completion that will be signaled once @refcount becomes 0. * @mutex: Protects nexus_list. * @nexus_list: Nexus list. See also srpt_nexus.entry. */ struct srpt_port { struct srpt_device *sdev; struct ib_mad_agent *mad_agent; bool enabled; u8 port; u32 sm_lid; u32 lid; union ib_gid gid; struct work_struct work; char guid_name[64]; struct srpt_port_id *guid_id; char gid_name[64]; struct srpt_port_id *gid_id; struct srpt_port_attrib port_attrib; atomic_t refcount; struct completion *freed_channels; struct mutex mutex; struct list_head nexus_list; }; /** * struct srpt_device - information associated by SRPT with a single HCA * @refcnt: Reference count for this device. * @device: Backpointer to the struct ib_device managed by the IB core. * @pd: IB protection domain. * @lkey: 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. * @sdev_mutex: Serializes use_srq changes. * @use_srq: Whether or not to use SRQ. * @req_buf_cache: kmem_cache for @ioctx_ring buffers. * @ioctx_ring: Per-HCA SRQ. * @event_handler: Per-HCA asynchronous IB event handler. * @list: Node in srpt_dev_list. * @port: Information about the ports owned by this HCA. */ struct srpt_device { struct kref refcnt; struct ib_device *device; struct ib_pd *pd; u32 lkey; struct ib_srq *srq; struct ib_cm_id *cm_id; int srq_size; struct mutex sdev_mutex; bool use_srq; struct kmem_cache *req_buf_cache; struct srpt_recv_ioctx **ioctx_ring; struct ib_event_handler event_handler; struct list_head list; struct srpt_port port[]; }; #endif /* IB_SRPT_H */