diff options
Diffstat (limited to 'drivers/infiniband/ulp/srpt/ib_srpt.h')
| -rw-r--r-- | drivers/infiniband/ulp/srpt/ib_srpt.h | 352 |
1 files changed, 189 insertions, 163 deletions
diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.h b/drivers/infiniband/ulp/srpt/ib_srpt.h index 3dae156905de..4c46b301eea1 100644 --- a/drivers/infiniband/ulp/srpt/ib_srpt.h +++ b/drivers/infiniband/ulp/srpt/ib_srpt.h @@ -42,6 +42,8 @@ #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> @@ -53,6 +55,8 @@ */ #define SRP_SERVICE_NAME_PREFIX "SRP.T10:" +struct srpt_nexus; + enum { /* * SRP IOControllerProfile attributes for SRP target ports that have @@ -100,27 +104,29 @@ enum { 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, + 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 - = sizeof(struct srp_cmd)/*48*/ - + sizeof(struct srp_indirect_buf)/*20*/ - + 128 * sizeof(struct srp_direct_buf)/*16*/, + 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 */ @@ -128,38 +134,8 @@ enum { 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. + * 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. @@ -183,261 +159,311 @@ enum srpt_command_state { }; /** - * struct srpt_ioctx - Shared SRPT I/O context information. + * 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. + * 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. + * 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'. + * @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. - * @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. + * @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 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; + 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; - 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; + u8 n_rw_ctx; bool queue_status_only; - u8 sense_data[SCSI_SENSE_BUFFERSIZE]; + 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 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 - 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_RELEASING + CH_DISCONNECTED, }; /** - * 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. + * 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. - * @rsp_size IB response message size in bytes. + * @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. - * @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. + * @imm_data_offset: Offset from start of SRP_CMD for immediate data. * @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. + * @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. - * @wc: IB work completion array for srpt_process_completion(). - * @list: Node for insertion in the srpt_device.rch_list list. + * @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(). - * @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 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 rsp_size; + u32 max_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; + u16 imm_data_offset; spinlock_t spinlock; - struct list_head free_list; enum rdma_ch_state state; + struct kmem_cache *rsp_buf_cache; struct srpt_send_ioctx **ioctx_ring; - struct ib_wc wc[16]; + 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[36]; + u8 sess_name[40]; struct work_struct release_work; - struct completion *release_done; - bool in_shutdown; }; /** - * struct srpt_port_attib - Attributes for SRPT port + * 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 - Information associated by SRPT with a single IB port. + * 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_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. + * @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_guid[64]; u8 port; - u16 sm_lid; - u16 lid; + u32 sm_lid; + u32 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; + 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. + * 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. - * @mr: L_Key (local key) with write access to all local memory. + * @lkey: 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. + * @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. - * @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. + * @port: Information about the ports owned by this HCA. */ struct srpt_device { + struct kref refcnt; struct ib_device *device; struct ib_pd *pd; - struct ib_mr *mr; + u32 lkey; struct ib_srq *srq; struct ib_cm_id *cm_id; - struct ib_device_attr dev_attr; int srq_size; + struct mutex sdev_mutex; + bool use_srq; + struct kmem_cache *req_buf_cache; 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]; + struct srpt_port port[]; }; #endif /* IB_SRPT_H */ |