diff options
Diffstat (limited to 'drivers/infiniband/ulp/srpt/ib_srpt.h')
| -rw-r--r-- | drivers/infiniband/ulp/srpt/ib_srpt.h | 100 |
1 files changed, 66 insertions, 34 deletions
diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.h b/drivers/infiniband/ulp/srpt/ib_srpt.h index 673387d365a3..4d9199fd00dc 100644 --- a/drivers/infiniband/ulp/srpt/ib_srpt.h +++ b/drivers/infiniband/ulp/srpt/ib_srpt.h @@ -54,6 +54,8 @@ */ #define SRP_SERVICE_NAME_PREFIX "SRP.T10:" +struct srpt_nexus; + enum { /* * SRP IOControllerProfile attributes for SRP target ports that have @@ -114,7 +116,7 @@ enum { 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, @@ -134,7 +136,7 @@ enum { }; /** - * 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. @@ -158,7 +160,8 @@ 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. * @index: Index of the I/O context in its ioctx_ring array. @@ -171,7 +174,7 @@ struct srpt_ioctx { }; /** - * 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. */ @@ -187,13 +190,20 @@ struct srpt_rw_ctx { }; /** - * struct srpt_send_ioctx - SRPT send I/O context. + * struct srpt_send_ioctx - SRPT send I/O context * @ioctx: See above. * @ch: Channel pointer. - * @spinlock: Protects 'state'. + * @s_rw_ctx: @rw_ctxs points here if only a single rw_ctx is needed. + * @rw_ctxs: RDMA read/write contexts. + * @rdma_cqe: RDMA completion queue element. + * @free_list: Node in srpt_rdma_ch.free_list. * @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; @@ -204,10 +214,8 @@ struct srpt_send_ioctx { struct ib_cqe rdma_cqe; struct list_head free_list; - spinlock_t spinlock; enum srpt_command_state state; struct se_cmd cmd; - struct completion tx_done; u8 n_rdma; u8 n_rw_ctx; bool queue_status_only; @@ -215,7 +223,7 @@ struct srpt_send_ioctx { }; /** - * enum rdma_ch_state - SRP channel state. + * 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 @@ -233,17 +241,19 @@ enum rdma_ch_state { }; /** - * struct srpt_rdma_ch - RDMA 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. + * @cm_id: IB CM ID associated with the channel. * @cq: IB completion queue for this channel. + * @zw_cqe: Zero-length write CQE. + * @rcu: RCU head. + * @kref: kref for this channel. * @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. @@ -251,30 +261,34 @@ enum rdma_ch_state { * @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. + * @processing_wait_list: Whether or not cmd_wait_list is being processed. * @ioctx_ring: Send ring. * @ioctx_recv_ring: Receive I/O context ring. - * @list: Node for insertion in the srpt_device.rch_list list. + * @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. - * @ini_guid: Initiator port GUID. * @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 srpt_nexus *nexus; struct ib_qp *qp; + union { + struct { + struct ib_cm_id *cm_id; + } ib_cm; + }; struct ib_cq *cq; struct ib_cqe zw_cqe; + struct rcu_head rcu; struct kref kref; 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; @@ -285,15 +299,31 @@ struct srpt_rdma_ch { struct srpt_recv_ioctx **ioctx_recv_ring; struct list_head list; struct list_head cmd_wait_list; + uint16_t pkey; + bool processing_wait_list; struct se_session *sess; - u8 sess_name[36]; - u8 ini_guid[24]; + u8 sess_name[24]; struct work_struct release_work; - struct completion *release_done; }; /** - * 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_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. @@ -307,7 +337,7 @@ struct srpt_port_attrib { }; /** - * struct srpt_port - Information associated by SRPT with a single IB port. + * 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. @@ -323,7 +353,10 @@ struct srpt_port_attrib { * @port_guid_wwn: WWN associated with target port GUID. * @port_gid_tpg: TPG associated with target port GID. * @port_gid_wwn: WWN associated with target port GID. - * @port_acl_list: Head of the list with all node ACLs for this port. + * @port_attrib: Port attributes that can be accessed through configfs. + * @ch_releaseQ: Enables waiting for removal from nexus_list. + * @mutex: Protects nexus_list. + * @nexus_list: Nexus list. See also srpt_nexus.entry. */ struct srpt_port { struct srpt_device *sdev; @@ -341,21 +374,22 @@ struct srpt_port { struct se_portal_group port_gid_tpg; struct se_wwn port_gid_wwn; struct srpt_port_attrib port_attrib; + wait_queue_head_t ch_releaseQ; + 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 * @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. * @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. @@ -367,11 +401,9 @@ struct srpt_device { struct ib_srq *srq; struct ib_cm_id *cm_id; int srq_size; + struct mutex sdev_mutex; bool use_srq; 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; |