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linux_dsm_epyc7002/include/linux/nvme-fc-driver.h
James Smart d6d20012e1 nvme-fabrics: Add FC transport LLDD api definitions 
Host:
 - LLDD registration with the host transport
 - registering host ports (local ports) and target ports seen on
   fabric (remote ports)
 - Data structures and call points for FC-4 LS's and FCP IO requests

Target:
 - LLDD registration with the target transport
 - registering nvme subsystem ports (target ports)
 - Data structures and call points for reception of FC-4 LS's and
   FCP IO requests, and callbacks to perform data and rsp transfers
   for the io.

Add to MAINTAINERS file

Signed-off-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jay Freyensee <james_p_freyensee@linux.intel.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
2016-12-06 10:17:56 +02:00

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/*
* Copyright (c) 2016, Avago Technologies
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#ifndef _NVME_FC_DRIVER_H
#define _NVME_FC_DRIVER_H 1
/*
* ********************** LLDD FC-NVME Host API ********************
*
* For FC LLDD's that are the NVME Host role.
*
* ******************************************************************
*/
/* FC Port role bitmask - can merge with FC Port Roles in fc transport */
#define FC_PORT_ROLE_NVME_INITIATOR 0x10
#define FC_PORT_ROLE_NVME_TARGET 0x11
#define FC_PORT_ROLE_NVME_DISCOVERY 0x12
/**
* 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)
*
* 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;
};
/**
* struct nvmefc_ls_req - Request structure passed from NVME-FC transport
* to LLDD in order to perform a NVME FC-4 LS
* request and obtain a response.
*
* Values set by the NVME-FC layer 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 nvme_fc_port_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 */
enum nvmefc_fcp_datadir {
NVMEFC_FCP_NODATA, /* payload_length and sg_cnt will be zero */
NVMEFC_FCP_WRITE,
NVMEFC_FCP_READ,
};
#define NVME_FC_MAX_SEGMENTS 256
/**
* 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,
* NVME_SC_FC_xxx value upon failure. 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.
*
* 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;
/* 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.
*
* @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 solely for the of 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);
void (*poll_queue)(struct nvme_fc_local_port *, 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 *);
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);
/*
* *************** 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;
};
/**
* struct nvmefc_tgt_ls_req - Structure used between LLDD and NVMET-FC
* layer to represent the exchange context for
* a FC-NVME Link Service (LS).
*
* 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
* layer via the nvmet_fc_rcv_ls_req() call. The address of the structure
* will be passed back to the LLDD when the response is to be transmit.
* The LLDD is to use the address to map back to the LLDD exchange structure
* which maintains information such as the targetport the LS was received
* on, the remote FC NVME initiator that sent the LS, and any FC exchange
* context. Upon completion of the LS response transmit, the address of the
* structure will be passed back to the LS rsp done() routine, allowing the
* nvmet-fc layer to release dma resources. Upon completion of the done()
* routine, 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_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 nvmet-fc
* 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 compeletion of the transmit. 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 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.
* @nvmet_fc_private: pointer to an internal NVMET-FC layer structure used
* as part of the NVMET-FC processing. The LLDD is not to access
* this pointer.
*/
struct nvmefc_tgt_ls_req {
void *rspbuf;
dma_addr_t rspdma;
u16 rsplen;
void (*done)(struct nvmefc_tgt_ls_req *req);
void *nvmet_fc_private; /* LLDD is not to access !! */
};
/* 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 */
NVMET_FCOP_ABORT = 5, /* abort exchange via ABTS */
NVMET_FCOP_BA_ACC = 6, /* send BA_ACC */
NVMET_FCOP_BA_RJT = 7, /* send BA_RJT */
};
/**
* 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.
*
* Note: the LLDD must never fail a NVMET_FCOP_ABORT request !!
*
* 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
* 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[NVME_FC_MAX_SEGMENTS];
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.
*/
NVMET_FCTGTFEAT_NEEDS_CMD_CPUSCHED = (1 << 1),
/* Bit 1: When 0, the LLDD will deliver FCP CMD
* on the CPU it should be affinitized to. Thus work will
* be scheduled on the cpu received on. When 1, the LLDD
* may not deliver the CMD on the CPU it should be worked
* on. The transport should pick a cpu to schedule the work
* on.
*/
};
/**
* 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_tgt_ls_req 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_tgt_ls_req structure
* (argument to done is the ls reqwuest structure itself).
* After calling the done routine, the LLDD shall consider the
* LS handling complete and the nvmefc_tgt_ls_req structure may
* be freed/released.
* Entrypoint is Mandatory.
*
* @fcp_op: Called to perform a data transfer, transmit a response, or
* abort an FCP opertion. 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).
* 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 reception of FCP_CONF, or upon
* FCP_CONF failure, 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). 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 reception of FCP_CONF, or upon FCP_CONF failure, the
* LLDD is to set the nvmefc_tgt_fcp_req fcp_error field and
* consider the operation complete..
* NVMET_FCOP_ABORT: the LLDD is to terminate the exchange
* corresponding to the fcp operation. The LLDD shall send
* ABTS and follow FC exchange abort-multi rules, including
* ABTS retries and possible logout.
* 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 all the "done" routine
* indicated in the fcp request. Upon return from the "done"
* routine for either a NVMET_FCOP_RSP or NVMET_FCOP_ABORT operation
* the fc-nvme layer will not longer reference the fcp request,
* allowing the LLDD to free/release the fcp request.
* 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.
*
* @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.
*/
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_tgt_ls_req *tls_req);
int (*fcp_op)(struct nvmet_fc_target_port *tgtport,
struct nvmefc_tgt_fcp_req *);
u32 max_hw_queues;
u16 max_sgl_segments;
u16 max_dif_sgl_segments;
u64 dma_boundary;
u32 target_features;
u32 target_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);
int nvmet_fc_rcv_ls_req(struct nvmet_fc_target_port *tgtport,
struct nvmefc_tgt_ls_req *lsreq,
void *lsreqbuf, u32 lsreqbuf_len);
int nvmet_fc_rcv_fcp_req(struct nvmet_fc_target_port *tgtport,
struct nvmefc_tgt_fcp_req *fcpreq,
void *cmdiubuf, u32 cmdiubuf_len);
#endif /* _NVME_FC_DRIVER_H */
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