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linux-stable/include/linux/nvme-fc-driver.h
Randy Dunlap fe5e26a70c nvme-fc: drop a duplicated word in a comment 
Drop the repeated word "a" in a comment.

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
2020-07-29 07:45:20 +02:00

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2016, Avago Technologies
*/
#ifndef _NVME_FC_DRIVER_H
#define _NVME_FC_DRIVER_H 1
#include <linux/scatterlist.h>
/*
* ********************** FC-NVME LS API ********************
*
* Data structures used by both FC-NVME hosts and FC-NVME
* targets to perform FC-NVME LS requests or transmit
* responses.
*
* ***********************************************************
*/
/**
* struct nvmefc_ls_req - Request structure passed from the transport
* to the LLDD to perform a NVME-FC LS request and obtain
* a response.
* Used by nvme-fc transport (host) to send LS's such as
* Create Association, Create Connection and Disconnect
* Association.
* Used by the nvmet-fc transport (controller) to send
* LS's such as Disconnect Association.
*
* Values set by the requestor prior to calling the LLDD ls_req entrypoint:
* @rqstaddr: pointer to request buffer
* @rqstdma: PCI DMA address of request buffer
* @rqstlen: Length, in bytes, of request buffer
* @rspaddr: pointer to response buffer
* @rspdma: PCI DMA address of response buffer
* @rsplen: Length, in bytes, of response buffer
* @timeout: Maximum amount of time, in seconds, to wait for the LS response.
* If timeout exceeded, LLDD to abort LS exchange and complete
* LS request with error status.
* @private: pointer to memory allocated alongside the ls request structure
* that is specifically for the LLDD to use while processing the
* request. The length of the buffer corresponds to the
* lsrqst_priv_sz value specified in the xxx_template supplied
* by the LLDD.
* @done: The callback routine the LLDD is to invoke upon completion of
* the LS request. req argument is the pointer to the original LS
* request structure. Status argument must be 0 upon success, a
* negative errno on failure (example: -ENXIO).
*/
struct nvmefc_ls_req {
void *rqstaddr;
dma_addr_t rqstdma;
u32 rqstlen;
void *rspaddr;
dma_addr_t rspdma;
u32 rsplen;
u32 timeout;
void *private;
void (*done)(struct nvmefc_ls_req *req, int status);
} __aligned(sizeof(u64)); /* alignment for other things alloc'd with */
/**
* struct nvmefc_ls_rsp - Structure passed from the transport to the LLDD
* to request the transmit the NVME-FC LS response to a
* NVME-FC LS request. The structure originates in the LLDD
* and is given to the transport via the xxx_rcv_ls_req()
* transport routine. As such, the structure represents the
* FC exchange context for the NVME-FC LS request that was
* received and which the response is to be sent for.
* Used by the LLDD to pass the nvmet-fc transport (controller)
* received LS's such as Create Association, Create Connection
* and Disconnect Association.
* Used by the LLDD to pass the nvme-fc transport (host)
* received LS's such as Disconnect Association or Disconnect
* Connection.
*
* The structure is allocated by the LLDD whenever a LS Request is received
* from the FC link. The address of the structure is passed to the nvmet-fc
* or nvme-fc layer via the xxx_rcv_ls_req() transport routines.
*
* The address of the structure is to be passed back to the LLDD
* when the response is to be transmit. The LLDD will use the address to
* map back to the LLDD exchange structure which maintains information such
* the remote N_Port that sent the LS as well as any FC exchange context.
* Upon completion of the LS response transmit, the LLDD will pass the
* address of the structure back to the transport LS rsp done() routine,
* allowing the transport release dma resources. Upon completion of
* the done() routine, no further access to the structure will be made by
* the transport and the LLDD can de-allocate the structure.
*
* Field initialization:
* At the time of the xxx_rcv_ls_req() call, there is no content that
* is valid in the structure.
*
* When the structure is used for the LLDD->xmt_ls_rsp() call, the
* transport layer will fully set the fields in order to specify the
* response payload buffer and its length as well as the done routine
* to be called upon completion of the transmit. The transport layer
* will also set a private pointer for its own use in the done routine.
*
* Values set by the transport layer prior to calling the LLDD xmt_ls_rsp
* entrypoint:
* @rspbuf: pointer to the LS response buffer
* @rspdma: PCI DMA address of the LS response buffer
* @rsplen: Length, in bytes, of the LS response buffer
* @done: The callback routine the LLDD is to invoke upon completion of
* transmitting the LS response. req argument is the pointer to
* the original ls request.
* @nvme_fc_private: pointer to an internal transport-specific structure
* used as part of the transport done() processing. The LLDD is
* not to access this pointer.
*/
struct nvmefc_ls_rsp {
void *rspbuf;
dma_addr_t rspdma;
u16 rsplen;
void (*done)(struct nvmefc_ls_rsp *rsp);
void *nvme_fc_private; /* LLDD is not to access !! */
};
/*
* ********************** LLDD FC-NVME Host API ********************
*
* For FC LLDD's that are the NVME Host role.
*
* ******************************************************************
*/
/**
* struct nvme_fc_port_info - port-specific ids and FC connection-specific
* data element used during NVME Host role
* registrations
*
* Static fields describing the port being registered:
* @node_name: FC WWNN for the port
* @port_name: FC WWPN for the port
* @port_role: What NVME roles are supported (see FC_PORT_ROLE_xxx)
* @dev_loss_tmo: maximum delay for reconnects to an association on
* this device. Used only on a remoteport.
*
* Initialization values for dynamic port fields:
* @port_id: FC N_Port_ID currently assigned the port. Upper 8 bits must
* be set to 0.
*/
struct nvme_fc_port_info {
u64 node_name;
u64 port_name;
u32 port_role;
u32 port_id;
u32 dev_loss_tmo;
};
enum nvmefc_fcp_datadir {
NVMEFC_FCP_NODATA, /* payload_length and sg_cnt will be zero */
NVMEFC_FCP_WRITE,
NVMEFC_FCP_READ,
};
/**
* struct nvmefc_fcp_req - Request structure passed from NVME-FC transport
* to LLDD in order to perform a NVME FCP IO operation.
*
* Values set by the NVME-FC layer prior to calling the LLDD fcp_io
* entrypoint.
* @cmdaddr: pointer to the FCP CMD IU buffer
* @rspaddr: pointer to the FCP RSP IU buffer
* @cmddma: PCI DMA address of the FCP CMD IU buffer
* @rspdma: PCI DMA address of the FCP RSP IU buffer
* @cmdlen: Length, in bytes, of the FCP CMD IU buffer
* @rsplen: Length, in bytes, of the FCP RSP IU buffer
* @payload_length: Length of DATA_IN or DATA_OUT payload data to transfer
* @sg_table: scatter/gather structure for payload data
* @first_sgl: memory for 1st scatter/gather list segment for payload data
* @sg_cnt: number of elements in the scatter/gather list
* @io_dir: direction of the FCP request (see NVMEFC_FCP_xxx)
* @sqid: The nvme SQID the command is being issued on
* @done: The callback routine the LLDD is to invoke upon completion of
* the FCP operation. req argument is the pointer to the original
* FCP IO operation.
* @private: pointer to memory allocated alongside the FCP operation
* request structure that is specifically for the LLDD to use
* while processing the operation. The length of the buffer
* corresponds to the fcprqst_priv_sz value specified in the
* nvme_fc_port_template supplied by the LLDD.
*
* Values set by the LLDD indicating completion status of the FCP operation.
* Must be set prior to calling the done() callback.
* @transferred_length: amount of payload data, in bytes, that were
* transferred. Should equal payload_length on success.
* @rcv_rsplen: length, in bytes, of the FCP RSP IU received.
* @status: Completion status of the FCP operation. must be 0 upon success,
* negative errno value upon failure (ex: -EIO). Note: this is
* NOT a reflection of the NVME CQE completion status. Only the
* status of the FCP operation at the NVME-FC level.
*/
struct nvmefc_fcp_req {
void *cmdaddr;
void *rspaddr;
dma_addr_t cmddma;
dma_addr_t rspdma;
u16 cmdlen;
u16 rsplen;
u32 payload_length;
struct sg_table sg_table;
struct scatterlist *first_sgl;
int sg_cnt;
enum nvmefc_fcp_datadir io_dir;
__le16 sqid;
void (*done)(struct nvmefc_fcp_req *req);
void *private;
u32 transferred_length;
u16 rcv_rsplen;
u32 status;
} __aligned(sizeof(u64)); /* alignment for other things alloc'd with */
/*
* Direct copy of fc_port_state enum. For later merging
*/
enum nvme_fc_obj_state {
FC_OBJSTATE_UNKNOWN,
FC_OBJSTATE_NOTPRESENT,
FC_OBJSTATE_ONLINE,
FC_OBJSTATE_OFFLINE, /* User has taken Port Offline */
FC_OBJSTATE_BLOCKED,
FC_OBJSTATE_BYPASSED,
FC_OBJSTATE_DIAGNOSTICS,
FC_OBJSTATE_LINKDOWN,
FC_OBJSTATE_ERROR,
FC_OBJSTATE_LOOPBACK,
FC_OBJSTATE_DELETED,
};
/**
* struct nvme_fc_local_port - structure used between NVME-FC transport and
* a LLDD to reference a local NVME host port.
* Allocated/created by the nvme_fc_register_localport()
* transport interface.
*
* Fields with static values for the port. Initialized by the
* port_info struct supplied to the registration call.
* @port_num: NVME-FC transport host port number
* @port_role: NVME roles are supported on the port (see FC_PORT_ROLE_xxx)
* @node_name: FC WWNN for the port
* @port_name: FC WWPN for the port
* @private: pointer to memory allocated alongside the local port
* structure that is specifically for the LLDD to use.
* The length of the buffer corresponds to the local_priv_sz
* value specified in the nvme_fc_port_template supplied by
* the LLDD.
* @dev_loss_tmo: maximum delay for reconnects to an association on
* this device. To modify, lldd must call
* nvme_fc_set_remoteport_devloss().
*
* Fields with dynamic values. Values may change base on link state. LLDD
* may reference fields directly to change them. Initialized by the
* port_info struct supplied to the registration call.
* @port_id: FC N_Port_ID currently assigned the port. Upper 8 bits must
* be set to 0.
* @port_state: Operational state of the port.
*/
struct nvme_fc_local_port {
/* static/read-only fields */
u32 port_num;
u32 port_role;
u64 node_name;
u64 port_name;
void *private;
/* dynamic fields */
u32 port_id;
enum nvme_fc_obj_state port_state;
} __aligned(sizeof(u64)); /* alignment for other things alloc'd with */
/**
* struct nvme_fc_remote_port - structure used between NVME-FC transport and
* a LLDD to reference a remote NVME subsystem port.
* Allocated/created by the nvme_fc_register_remoteport()
* transport interface.
*
* Fields with static values for the port. Initialized by the
* port_info struct supplied to the registration call.
* @port_num: NVME-FC transport remote subsystem port number
* @port_role: NVME roles are supported on the port (see FC_PORT_ROLE_xxx)
* @node_name: FC WWNN for the port
* @port_name: FC WWPN for the port
* @localport: pointer to the NVME-FC local host port the subsystem is
* connected to.
* @private: pointer to memory allocated alongside the remote port
* structure that is specifically for the LLDD to use.
* The length of the buffer corresponds to the remote_priv_sz
* value specified in the nvme_fc_port_template supplied by
* the LLDD.
*
* Fields with dynamic values. Values may change base on link or login
* state. LLDD may reference fields directly to change them. Initialized by
* the port_info struct supplied to the registration call.
* @port_id: FC N_Port_ID currently assigned the port. Upper 8 bits must
* be set to 0.
* @port_state: Operational state of the remote port. Valid values are
* ONLINE or UNKNOWN.
*/
struct nvme_fc_remote_port {
/* static fields */
u32 port_num;
u32 port_role;
u64 node_name;
u64 port_name;
struct nvme_fc_local_port *localport;
void *private;
u32 dev_loss_tmo;
/* dynamic fields */
u32 port_id;
enum nvme_fc_obj_state port_state;
} __aligned(sizeof(u64)); /* alignment for other things alloc'd with */
/**
* struct nvme_fc_port_template - structure containing static entrypoints and
* operational parameters for an LLDD that supports NVME host
* behavior. Passed by reference in port registrations.
* NVME-FC transport remembers template reference and may
* access it during runtime operation.
*
* Host/Initiator Transport Entrypoints/Parameters:
*
* @localport_delete: The LLDD initiates deletion of a localport via
* nvme_fc_deregister_localport(). However, the teardown is
* asynchronous. This routine is called upon the completion of the
* teardown to inform the LLDD that the localport has been deleted.
* Entrypoint is Mandatory.
*
* @remoteport_delete: The LLDD initiates deletion of a remoteport via
* nvme_fc_deregister_remoteport(). However, the teardown is
* asynchronous. This routine is called upon the completion of the
* teardown to inform the LLDD that the remoteport has been deleted.
* Entrypoint is Mandatory.
*
* @create_queue: Upon creating a host<->controller association, queues are
* created such that they can be affinitized to cpus/cores. This
* callback into the LLDD to notify that a controller queue is being
* created. The LLDD may choose to allocate an associated hw queue
* or map it onto a shared hw queue. Upon return from the call, the
* LLDD specifies a handle that will be given back to it for any
* command that is posted to the controller queue. The handle can
* be used by the LLDD to map quickly to the proper hw queue for
* command execution. The mask of cpu's that will map to this queue
* at the block-level is also passed in. The LLDD should use the
* queue id and/or cpu masks to ensure proper affinitization of the
* controller queue to the hw queue.
* Entrypoint is Optional.
*
* @delete_queue: This is the inverse of the crete_queue. During
* host<->controller association teardown, this routine is called
* when a controller queue is being terminated. Any association with
* a hw queue should be termined. If there is a unique hw queue, the
* hw queue should be torn down.
* Entrypoint is Optional.
*
* @poll_queue: Called to poll for the completion of an io on a blk queue.
* Entrypoint is Optional.
*
* @ls_req: Called to issue a FC-NVME FC-4 LS service request.
* The nvme_fc_ls_req structure will fully describe the buffers for
* the request payload and where to place the response payload. The
* LLDD is to allocate an exchange, issue the LS request, obtain the
* LS response, and call the "done" routine specified in the request
* structure (argument to done is the ls request structure itself).
* Entrypoint is Mandatory.
*
* @fcp_io: called to issue a FC-NVME I/O request. The I/O may be for
* an admin queue or an i/o queue. The nvmefc_fcp_req structure will
* fully describe the io: the buffer containing the FC-NVME CMD IU
* (which contains the SQE), the sg list for the payload if applicable,
* and the buffer to place the FC-NVME RSP IU into. The LLDD will
* complete the i/o, indicating the amount of data transferred or
* any transport error, and call the "done" routine specified in the
* request structure (argument to done is the fcp request structure
* itself).
* Entrypoint is Mandatory.
*
* @ls_abort: called to request the LLDD to abort the indicated ls request.
* The call may return before the abort has completed. After aborting
* the request, the LLDD must still call the ls request done routine
* indicating an FC transport Aborted status.
* Entrypoint is Mandatory.
*
* @fcp_abort: called to request the LLDD to abort the indicated fcp request.
* The call may return before the abort has completed. After aborting
* the request, the LLDD must still call the fcp request done routine
* indicating an FC transport Aborted status.
* Entrypoint is Mandatory.
*
* @xmt_ls_rsp: Called to transmit the response to a FC-NVME FC-4 LS service.
* The nvmefc_ls_rsp structure is the same LLDD-supplied exchange
* structure specified in the nvme_fc_rcv_ls_req() call made when
* the LS request was received. The structure will fully describe
* the buffers for the response payload and the dma address of the
* payload. The LLDD is to transmit the response (or return a
* non-zero errno status), and upon completion of the transmit, call
* the "done" routine specified in the nvmefc_ls_rsp structure
* (argument to done is the address of the nvmefc_ls_rsp structure
* itself). Upon the completion of the done routine, the LLDD shall
* consider the LS handling complete and the nvmefc_ls_rsp structure
* may be freed/released.
* Entrypoint is mandatory if the LLDD calls the nvme_fc_rcv_ls_req()
* entrypoint.
*
* @max_hw_queues: indicates the maximum number of hw queues the LLDD
* supports for cpu affinitization.
* Value is Mandatory. Must be at least 1.
*
* @max_sgl_segments: indicates the maximum number of sgl segments supported
* by the LLDD
* Value is Mandatory. Must be at least 1. Recommend at least 256.
*
* @max_dif_sgl_segments: indicates the maximum number of sgl segments
* supported by the LLDD for DIF operations.
* Value is Mandatory. Must be at least 1. Recommend at least 256.
*
* @dma_boundary: indicates the dma address boundary where dma mappings
* will be split across.
* Value is Mandatory. Typical value is 0xFFFFFFFF to split across
* 4Gig address boundarys
*
* @local_priv_sz: The LLDD sets this field to the amount of additional
* memory that it would like fc nvme layer to allocate on the LLDD's
* behalf whenever a localport is allocated. The additional memory
* area solely for the of the LLDD and its location is specified by
* the localport->private pointer.
* Value is Mandatory. Allowed to be zero.
*
* @remote_priv_sz: The LLDD sets this field to the amount of additional
* memory that it would like fc nvme layer to allocate on the LLDD's
* behalf whenever a remoteport is allocated. The additional memory
* area solely for the of the LLDD and its location is specified by
* the remoteport->private pointer.
* Value is Mandatory. Allowed to be zero.
*
* @lsrqst_priv_sz: The LLDD sets this field to the amount of additional
* memory that it would like fc nvme layer to allocate on the LLDD's
* behalf whenever a ls request structure is allocated. The additional
* memory area is solely for use by the LLDD and its location is
* specified by the ls_request->private pointer.
* Value is Mandatory. Allowed to be zero.
*
* @fcprqst_priv_sz: The LLDD sets this field to the amount of additional
* memory that it would like fc nvme layer to allocate on the LLDD's
* behalf whenever a fcp request structure is allocated. The additional
* memory area solely for the of the LLDD and its location is
* specified by the fcp_request->private pointer.
* Value is Mandatory. Allowed to be zero.
*/
struct nvme_fc_port_template {
/* initiator-based functions */
void (*localport_delete)(struct nvme_fc_local_port *);
void (*remoteport_delete)(struct nvme_fc_remote_port *);
int (*create_queue)(struct nvme_fc_local_port *,
unsigned int qidx, u16 qsize,
void **handle);
void (*delete_queue)(struct nvme_fc_local_port *,
unsigned int qidx, void *handle);
int (*ls_req)(struct nvme_fc_local_port *,
struct nvme_fc_remote_port *,
struct nvmefc_ls_req *);
int (*fcp_io)(struct nvme_fc_local_port *,
struct nvme_fc_remote_port *,
void *hw_queue_handle,
struct nvmefc_fcp_req *);
void (*ls_abort)(struct nvme_fc_local_port *,
struct nvme_fc_remote_port *,
struct nvmefc_ls_req *);
void (*fcp_abort)(struct nvme_fc_local_port *,
struct nvme_fc_remote_port *,
void *hw_queue_handle,
struct nvmefc_fcp_req *);
int (*xmt_ls_rsp)(struct nvme_fc_local_port *localport,
struct nvme_fc_remote_port *rport,
struct nvmefc_ls_rsp *ls_rsp);
u32 max_hw_queues;
u16 max_sgl_segments;
u16 max_dif_sgl_segments;
u64 dma_boundary;
/* sizes of additional private data for data structures */
u32 local_priv_sz;
u32 remote_priv_sz;
u32 lsrqst_priv_sz;
u32 fcprqst_priv_sz;
};
/*
* Initiator/Host functions
*/
int nvme_fc_register_localport(struct nvme_fc_port_info *pinfo,
struct nvme_fc_port_template *template,
struct device *dev,
struct nvme_fc_local_port **lport_p);
int nvme_fc_unregister_localport(struct nvme_fc_local_port *localport);
int nvme_fc_register_remoteport(struct nvme_fc_local_port *localport,
struct nvme_fc_port_info *pinfo,
struct nvme_fc_remote_port **rport_p);
int nvme_fc_unregister_remoteport(struct nvme_fc_remote_port *remoteport);
void nvme_fc_rescan_remoteport(struct nvme_fc_remote_port *remoteport);
int nvme_fc_set_remoteport_devloss(struct nvme_fc_remote_port *remoteport,
u32 dev_loss_tmo);
/*
* Routine called to pass a NVME-FC LS request, received by the lldd,
* to the nvme-fc transport.
*
* If the return value is zero: the LS was successfully accepted by the
* transport.
* If the return value is non-zero: the transport has not accepted the
* LS. The lldd should ABTS-LS the LS.
*
* Note: if the LLDD receives and ABTS for the LS prior to the transport
* calling the ops->xmt_ls_rsp() routine to transmit a response, the LLDD
* shall mark the LS as aborted, and when the xmt_ls_rsp() is called: the
* response shall not be transmit and the struct nvmefc_ls_rsp() done
* routine shall be called. The LLDD may transmit the ABTS response as
* soon as the LS was marked or can delay until the xmt_ls_rsp() call is
* made.
* Note: if an RCV LS was successfully posted to the transport and the
* remoteport is then unregistered before xmt_ls_rsp() was called for
* the lsrsp structure, the transport will still call xmt_ls_rsp()
* afterward to cleanup the outstanding lsrsp structure. The LLDD should
* noop the transmission of the rsp and call the lsrsp->done() routine
* to allow the lsrsp structure to be released.
*/
int nvme_fc_rcv_ls_req(struct nvme_fc_remote_port *remoteport,
struct nvmefc_ls_rsp *lsrsp,
void *lsreqbuf, u32 lsreqbuf_len);
/*
* *************** LLDD FC-NVME Target/Subsystem API ***************
*
* For FC LLDD's that are the NVME Subsystem role
*
* ******************************************************************
*/
/**
* struct nvmet_fc_port_info - port-specific ids and FC connection-specific
* data element used during NVME Subsystem role
* registrations
*
* Static fields describing the port being registered:
* @node_name: FC WWNN for the port
* @port_name: FC WWPN for the port
*
* Initialization values for dynamic port fields:
* @port_id: FC N_Port_ID currently assigned the port. Upper 8 bits must
* be set to 0.
*/
struct nvmet_fc_port_info {
u64 node_name;
u64 port_name;
u32 port_id;
};
/* Operations that NVME-FC layer may request the LLDD to perform for FCP */
enum {
NVMET_FCOP_READDATA = 1, /* xmt data to initiator */
NVMET_FCOP_WRITEDATA = 2, /* xmt data from initiator */
NVMET_FCOP_READDATA_RSP = 3, /* xmt data to initiator and send
* rsp as well
*/
NVMET_FCOP_RSP = 4, /* send rsp frame */
};
/**
* struct nvmefc_tgt_fcp_req - Structure used between LLDD and NVMET-FC
* layer to represent the exchange context and
* the specific FC-NVME IU operation(s) to perform
* for a FC-NVME FCP IO.
*
* Structure used between LLDD and nvmet-fc layer to represent the exchange
* context for a FC-NVME FCP I/O operation (e.g. a nvme sqe, the sqe-related
* memory transfers, and its assocated cqe transfer).
*
* The structure is allocated by the LLDD whenever a FCP CMD IU is received
* from the FC link. The address of the structure is passed to the nvmet-fc
* layer via the nvmet_fc_rcv_fcp_req() call. The address of the structure
* will be passed back to the LLDD for the data operations and transmit of
* the response. The LLDD is to use the address to map back to the LLDD
* exchange structure which maintains information such as the targetport
* the FCP I/O was received on, the remote FC NVME initiator that sent the
* FCP I/O, and any FC exchange context. Upon completion of the FCP target
* operation, the address of the structure will be passed back to the FCP
* op done() routine, allowing the nvmet-fc layer to release dma resources.
* Upon completion of the done() routine for either RSP or ABORT ops, no
* further access will be made by the nvmet-fc layer and the LLDD can
* de-allocate the structure.
*
* Field initialization:
* At the time of the nvmet_fc_rcv_fcp_req() call, there is no content that
* is valid in the structure.
*
* When the structure is used for an FCP target operation, the nvmet-fc
* layer will fully set the fields in order to specify the scattergather
* list, the transfer length, as well as the done routine to be called
* upon compeletion of the operation. The nvmet-fc layer will also set a
* private pointer for its own use in the done routine.
*
* Values set by the NVMET-FC layer prior to calling the LLDD fcp_op
* entrypoint.
* @op: Indicates the FCP IU operation to perform (see NVMET_FCOP_xxx)
* @hwqid: Specifies the hw queue index (0..N-1, where N is the
* max_hw_queues value from the LLD's nvmet_fc_target_template)
* that the operation is to use.
* @offset: Indicates the DATA_OUT/DATA_IN payload offset to be tranferred.
* Field is only valid on WRITEDATA, READDATA, or READDATA_RSP ops.
* @timeout: amount of time, in seconds, to wait for a response from the NVME
* host. A value of 0 is an infinite wait.
* Valid only for the following ops:
* WRITEDATA: caps the wait for data reception
* READDATA_RSP & RSP: caps wait for FCP_CONF reception (if used)
* @transfer_length: the length, in bytes, of the DATA_OUT or DATA_IN payload
* that is to be transferred.
* Valid only for the WRITEDATA, READDATA, or READDATA_RSP ops.
* @ba_rjt: Contains the BA_RJT payload that is to be transferred.
* Valid only for the NVMET_FCOP_BA_RJT op.
* @sg: Scatter/gather list for the DATA_OUT/DATA_IN payload data.
* Valid only for the WRITEDATA, READDATA, or READDATA_RSP ops.
* @sg_cnt: Number of valid entries in the scatter/gather list.
* Valid only for the WRITEDATA, READDATA, or READDATA_RSP ops.
* @rspaddr: pointer to the FCP RSP IU buffer to be transmit
* Used by RSP and READDATA_RSP ops
* @rspdma: PCI DMA address of the FCP RSP IU buffer
* Used by RSP and READDATA_RSP ops
* @rsplen: Length, in bytes, of the FCP RSP IU buffer
* Used by RSP and READDATA_RSP ops
* @done: The callback routine the LLDD is to invoke upon completion of
* the operation. req argument is the pointer to the original
* FCP subsystem op request.
* @nvmet_fc_private: pointer to an internal NVMET-FC layer structure used
* as part of the NVMET-FC processing. The LLDD is not to
* reference this field.
*
* Values set by the LLDD indicating completion status of the FCP operation.
* Must be set prior to calling the done() callback.
* @transferred_length: amount of DATA_OUT payload data received by a
* WRITEDATA operation. If not a WRITEDATA operation, value must
* be set to 0. Should equal transfer_length on success.
* @fcp_error: status of the FCP operation. Must be 0 on success; on failure
* must be a NVME_SC_FC_xxxx value.
*/
struct nvmefc_tgt_fcp_req {
u8 op;
u16 hwqid;
u32 offset;
u32 timeout;
u32 transfer_length;
struct fc_ba_rjt ba_rjt;
struct scatterlist *sg;
int sg_cnt;
void *rspaddr;
dma_addr_t rspdma;
u16 rsplen;
void (*done)(struct nvmefc_tgt_fcp_req *);
void *nvmet_fc_private; /* LLDD is not to access !! */
u32 transferred_length;
int fcp_error;
};
/* Target Features (Bit fields) LLDD supports */
enum {
NVMET_FCTGTFEAT_READDATA_RSP = (1 << 0),
/* Bit 0: supports the NVMET_FCPOP_READDATA_RSP op, which
* sends (the last) Read Data sequence followed by the RSP
* sequence in one LLDD operation. Errors during Data
* sequence transmit must not allow RSP sequence to be sent.
*/
};
/**
* struct nvmet_fc_target_port - structure used between NVME-FC transport and
* a LLDD to reference a local NVME subsystem port.
* Allocated/created by the nvme_fc_register_targetport()
* transport interface.
*
* Fields with static values for the port. Initialized by the
* port_info struct supplied to the registration call.
* @port_num: NVME-FC transport subsytem port number
* @node_name: FC WWNN for the port
* @port_name: FC WWPN for the port
* @private: pointer to memory allocated alongside the local port
* structure that is specifically for the LLDD to use.
* The length of the buffer corresponds to the target_priv_sz
* value specified in the nvme_fc_target_template supplied by
* the LLDD.
*
* Fields with dynamic values. Values may change base on link state. LLDD
* may reference fields directly to change them. Initialized by the
* port_info struct supplied to the registration call.
* @port_id: FC N_Port_ID currently assigned the port. Upper 8 bits must
* be set to 0.
* @port_state: Operational state of the port.
*/
struct nvmet_fc_target_port {
/* static/read-only fields */
u32 port_num;
u64 node_name;
u64 port_name;
void *private;
/* dynamic fields */
u32 port_id;
enum nvme_fc_obj_state port_state;
} __aligned(sizeof(u64)); /* alignment for other things alloc'd with */
/**
* struct nvmet_fc_target_template - structure containing static entrypoints
* and operational parameters for an LLDD that supports NVME
* subsystem behavior. Passed by reference in port
* registrations. NVME-FC transport remembers template
* reference and may access it during runtime operation.
*
* Subsystem/Target Transport Entrypoints/Parameters:
*
* @targetport_delete: The LLDD initiates deletion of a targetport via
* nvmet_fc_unregister_targetport(). However, the teardown is
* asynchronous. This routine is called upon the completion of the
* teardown to inform the LLDD that the targetport has been deleted.
* Entrypoint is Mandatory.
*
* @xmt_ls_rsp: Called to transmit the response to a FC-NVME FC-4 LS service.
* The nvmefc_ls_rsp structure is the same LLDD-supplied exchange
* structure specified in the nvmet_fc_rcv_ls_req() call made when
* the LS request was received. The structure will fully describe
* the buffers for the response payload and the dma address of the
* payload. The LLDD is to transmit the response (or return a
* non-zero errno status), and upon completion of the transmit, call
* the "done" routine specified in the nvmefc_ls_rsp structure
* (argument to done is the address of the nvmefc_ls_rsp structure
* itself). Upon the completion of the done() routine, the LLDD shall
* consider the LS handling complete and the nvmefc_ls_rsp structure
* may be freed/released.
* The transport will always call the xmt_ls_rsp() routine for any
* LS received.
* Entrypoint is Mandatory.
*
* @fcp_op: Called to perform a data transfer or transmit a response.
* The nvmefc_tgt_fcp_req structure is the same LLDD-supplied
* exchange structure specified in the nvmet_fc_rcv_fcp_req() call
* made when the FCP CMD IU was received. The op field in the
* structure shall indicate the operation for the LLDD to perform
* relative to the io.
* NVMET_FCOP_READDATA operation: the LLDD is to send the
* payload data (described by sglist) to the host in 1 or
* more FC sequences (preferrably 1). Note: the fc-nvme layer
* may call the READDATA operation multiple times for longer
* payloads.
* NVMET_FCOP_WRITEDATA operation: the LLDD is to receive the
* payload data (described by sglist) from the host via 1 or
* more FC sequences (preferrably 1). The LLDD is to generate
* the XFER_RDY IU(s) corresponding to the data being requested.
* Note: the FC-NVME layer may call the WRITEDATA operation
* multiple times for longer payloads.
* NVMET_FCOP_READDATA_RSP operation: the LLDD is to send the
* payload data (described by sglist) to the host in 1 or
* more FC sequences (preferrably 1). If an error occurs during
* payload data transmission, the LLDD is to set the
* nvmefc_tgt_fcp_req fcp_error and transferred_length field, then
* consider the operation complete. On error, the LLDD is to not
* transmit the FCP_RSP iu. If all payload data is transferred
* successfully, the LLDD is to update the nvmefc_tgt_fcp_req
* transferred_length field and may subsequently transmit the
* FCP_RSP iu payload (described by rspbuf, rspdma, rsplen).
* If FCP_CONF is supported, the LLDD is to await FCP_CONF
* reception to confirm the RSP reception by the host. The LLDD
* may retramsit the FCP_RSP iu if necessary per FC-NVME. Upon
* transmission of the FCP_RSP iu if FCP_CONF is not supported,
* or upon success/failure of FCP_CONF if it is supported, the
* LLDD is to set the nvmefc_tgt_fcp_req fcp_error field and
* consider the operation complete.
* NVMET_FCOP_RSP: the LLDD is to transmit the FCP_RSP iu payload
* (described by rspbuf, rspdma, rsplen). If FCP_CONF is
* supported, the LLDD is to await FCP_CONF reception to confirm
* the RSP reception by the host. The LLDD may retramsit the
* FCP_RSP iu if FCP_CONF is not received per FC-NVME. Upon
* transmission of the FCP_RSP iu if FCP_CONF is not supported,
* or upon success/failure of FCP_CONF if it is supported, the
* LLDD is to set the nvmefc_tgt_fcp_req fcp_error field and
* consider the operation complete.
* Upon completing the indicated operation, the LLDD is to set the
* status fields for the operation (tranferred_length and fcp_error
* status) in the request, then call the "done" routine
* indicated in the fcp request. After the operation completes,
* regardless of whether the FCP_RSP iu was successfully transmit,
* the LLDD-supplied exchange structure must remain valid until the
* transport calls the fcp_req_release() callback to return ownership
* of the exchange structure back to the LLDD so that it may be used
* for another fcp command.
* Note: when calling the done routine for READDATA or WRITEDATA
* operations, the fc-nvme layer may immediate convert, in the same
* thread and before returning to the LLDD, the fcp operation to
* the next operation for the fcp io and call the LLDDs fcp_op
* call again. If fields in the fcp request are to be accessed post
* the done call, the LLDD should save their values prior to calling
* the done routine, and inspect the save values after the done
* routine.
* Returns 0 on success, -<errno> on failure (Ex: -EIO)
* Entrypoint is Mandatory.
*
* @fcp_abort: Called by the transport to abort an active command.
* The command may be in-between operations (nothing active in LLDD)
* or may have an active WRITEDATA operation pending. The LLDD is to
* initiate the ABTS process for the command and return from the
* callback. The ABTS does not need to be complete on the command.
* The fcp_abort callback inherently cannot fail. After the
* fcp_abort() callback completes, the transport will wait for any
* outstanding operation (if there was one) to complete, then will
* call the fcp_req_release() callback to return the command's
* exchange context back to the LLDD.
* Entrypoint is Mandatory.
*
* @fcp_req_release: Called by the transport to return a nvmefc_tgt_fcp_req
* to the LLDD after all operations on the fcp operation are complete.
* This may be due to the command completing or upon completion of
* abort cleanup.
* Entrypoint is Mandatory.
*
* @defer_rcv: Called by the transport to signal the LLLD that it has
* begun processing of a previously received NVME CMD IU. The LLDD
* is now free to re-use the rcv buffer associated with the
* nvmefc_tgt_fcp_req.
* Entrypoint is Optional.
*
* @discovery_event: Called by the transport to generate an RSCN
* change notifications to NVME initiators. The RSCN notifications
* should cause the initiator to rescan the discovery controller
* on the targetport.
*
* @ls_req: Called to issue a FC-NVME FC-4 LS service request.
* The nvme_fc_ls_req structure will fully describe the buffers for
* the request payload and where to place the response payload.
* The targetport that is to issue the LS request is identified by
* the targetport argument. The remote port that is to receive the
* LS request is identified by the hosthandle argument. The nvmet-fc
* transport is only allowed to issue FC-NVME LS's on behalf of an
* association that was created prior by a Create Association LS.
* The hosthandle will originate from the LLDD in the struct
* nvmefc_ls_rsp structure for the Create Association LS that
* was delivered to the transport. The transport will save the
* hosthandle as an attribute of the association. If the LLDD
* loses connectivity with the remote port, it must call the
* nvmet_fc_invalidate_host() routine to remove any references to
* the remote port in the transport.
* The LLDD is to allocate an exchange, issue the LS request, obtain
* the LS response, and call the "done" routine specified in the
* request structure (argument to done is the ls request structure
* itself).
* Entrypoint is Optional - but highly recommended.
*
* @ls_abort: called to request the LLDD to abort the indicated ls request.
* The call may return before the abort has completed. After aborting
* the request, the LLDD must still call the ls request done routine
* indicating an FC transport Aborted status.
* Entrypoint is Mandatory if the ls_req entry point is specified.
*
* @host_release: called to inform the LLDD that the request to invalidate
* the host port indicated by the hosthandle has been fully completed.
* No associations exist with the host port and there will be no
* further references to hosthandle.
* Entrypoint is Mandatory if the lldd calls nvmet_fc_invalidate_host().
*
* @max_hw_queues: indicates the maximum number of hw queues the LLDD
* supports for cpu affinitization.
* Value is Mandatory. Must be at least 1.
*
* @max_sgl_segments: indicates the maximum number of sgl segments supported
* by the LLDD
* Value is Mandatory. Must be at least 1. Recommend at least 256.
*
* @max_dif_sgl_segments: indicates the maximum number of sgl segments
* supported by the LLDD for DIF operations.
* Value is Mandatory. Must be at least 1. Recommend at least 256.
*
* @dma_boundary: indicates the dma address boundary where dma mappings
* will be split across.
* Value is Mandatory. Typical value is 0xFFFFFFFF to split across
* 4Gig address boundarys
*
* @target_features: The LLDD sets bits in this field to correspond to
* optional features that are supported by the LLDD.
* Refer to the NVMET_FCTGTFEAT_xxx values.
* Value is Mandatory. Allowed to be zero.
*
* @target_priv_sz: The LLDD sets this field to the amount of additional
* memory that it would like fc nvme layer to allocate on the LLDD's
* behalf whenever a targetport is allocated. The additional memory
* area solely for the of the LLDD and its location is specified by
* the targetport->private pointer.
* Value is Mandatory. Allowed to be zero.
*
* @lsrqst_priv_sz: The LLDD sets this field to the amount of additional
* memory that it would like nvmet-fc layer to allocate on the LLDD's
* behalf whenever a ls request structure is allocated. The additional
* memory area is solely for use by the LLDD and its location is
* specified by the ls_request->private pointer.
* Value is Mandatory. Allowed to be zero.
*
*/
struct nvmet_fc_target_template {
void (*targetport_delete)(struct nvmet_fc_target_port *tgtport);
int (*xmt_ls_rsp)(struct nvmet_fc_target_port *tgtport,
struct nvmefc_ls_rsp *ls_rsp);
int (*fcp_op)(struct nvmet_fc_target_port *tgtport,
struct nvmefc_tgt_fcp_req *fcpreq);
void (*fcp_abort)(struct nvmet_fc_target_port *tgtport,
struct nvmefc_tgt_fcp_req *fcpreq);
void (*fcp_req_release)(struct nvmet_fc_target_port *tgtport,
struct nvmefc_tgt_fcp_req *fcpreq);
void (*defer_rcv)(struct nvmet_fc_target_port *tgtport,
struct nvmefc_tgt_fcp_req *fcpreq);
void (*discovery_event)(struct nvmet_fc_target_port *tgtport);
int (*ls_req)(struct nvmet_fc_target_port *targetport,
void *hosthandle, struct nvmefc_ls_req *lsreq);
void (*ls_abort)(struct nvmet_fc_target_port *targetport,
void *hosthandle, struct nvmefc_ls_req *lsreq);
void (*host_release)(void *hosthandle);
u32 max_hw_queues;
u16 max_sgl_segments;
u16 max_dif_sgl_segments;
u64 dma_boundary;
u32 target_features;
/* sizes of additional private data for data structures */
u32 target_priv_sz;
u32 lsrqst_priv_sz;
};
int nvmet_fc_register_targetport(struct nvmet_fc_port_info *portinfo,
struct nvmet_fc_target_template *template,
struct device *dev,
struct nvmet_fc_target_port **tgtport_p);
int nvmet_fc_unregister_targetport(struct nvmet_fc_target_port *tgtport);
/*
* Routine called to pass a NVME-FC LS request, received by the lldd,
* to the nvmet-fc transport.
*
* If the return value is zero: the LS was successfully accepted by the
* transport.
* If the return value is non-zero: the transport has not accepted the
* LS. The lldd should ABTS-LS the LS.
*
* Note: if the LLDD receives and ABTS for the LS prior to the transport
* calling the ops->xmt_ls_rsp() routine to transmit a response, the LLDD
* shall mark the LS as aborted, and when the xmt_ls_rsp() is called: the
* response shall not be transmit and the struct nvmefc_ls_rsp() done
* routine shall be called. The LLDD may transmit the ABTS response as
* soon as the LS was marked or can delay until the xmt_ls_rsp() call is
* made.
* Note: if an RCV LS was successfully posted to the transport and the
* targetport is then unregistered before xmt_ls_rsp() was called for
* the lsrsp structure, the transport will still call xmt_ls_rsp()
* afterward to cleanup the outstanding lsrsp structure. The LLDD should
* noop the transmission of the rsp and call the lsrsp->done() routine
* to allow the lsrsp structure to be released.
*/
int nvmet_fc_rcv_ls_req(struct nvmet_fc_target_port *tgtport,
void *hosthandle,
struct nvmefc_ls_rsp *rsp,
void *lsreqbuf, u32 lsreqbuf_len);
/*
* Routine called by the LLDD whenever it has a logout or loss of
* connectivity to a NVME-FC host port which there had been active
* NVMe controllers for. The host port is indicated by the
* hosthandle. The hosthandle is given to the nvmet-fc transport
* when a NVME LS was received, typically to create a new association.
* The nvmet-fc transport will cache the hostport value with the
* association for use in LS requests for the association.
* When the LLDD calls this routine, the nvmet-fc transport will
* immediately terminate all associations that were created with
* the hosthandle host port.
* The LLDD, after calling this routine and having control returned,
* must assume the transport may subsequently utilize hosthandle as
* part of sending LS's to terminate the association. The LLDD
* should reject the LS's if they are attempted.
* Once the last association has terminated for the hosthandle host
* port, the nvmet-fc transport will call the ops->host_release()
* callback. As of the callback, the nvmet-fc transport will no
* longer reference hosthandle.
*/
void nvmet_fc_invalidate_host(struct nvmet_fc_target_port *tgtport,
void *hosthandle);
/*
* If nvmet_fc_rcv_fcp_req returns non-zero, the transport has not accepted
* the FCP cmd. The lldd should ABTS-LS the cmd.
*/
int nvmet_fc_rcv_fcp_req(struct nvmet_fc_target_port *tgtport,
struct nvmefc_tgt_fcp_req *fcpreq,
void *cmdiubuf, u32 cmdiubuf_len);
void nvmet_fc_rcv_fcp_abort(struct nvmet_fc_target_port *tgtport,
struct nvmefc_tgt_fcp_req *fcpreq);
#endif /* _NVME_FC_DRIVER_H */
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