/* * Copyright (c) 2006 - 2009 Mellanox Technology Inc. All rights reserved. * Copyright (C) 2009 - 2010 Bart Van Assche . * * 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 #include #include #include #include #include #include #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 . 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 */