* [PATCH 3/7] nvme-fabrics: Add FC transport LLDD api definitions
@ 2016-10-04 6:26 James Smart
2016-10-04 7:36 ` Hannes Reinecke
0 siblings, 1 reply; 4+ messages in thread
From: James Smart @ 2016-10-04 6:26 UTC (permalink / raw)
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.
(Patch unchanged from prior posting)
Signed-off-by: James Smart <james.smart at broadcom.com>
Acked-by: Johannes Thumshirn <jth at kernel.org>
Acked-by: Jay Freyensee <james_p_freyensee at linux.intel.com>
Reviewed-by: Christoph Hellwig <hch at lst.de>
---
include/linux/nvme-fc-driver.h | 823 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 823 insertions(+)
create mode 100644 include/linux/nvme-fc-driver.h
diff --git a/include/linux/nvme-fc-driver.h b/include/linux/nvme-fc-driver.h
new file mode 100644
index 0000000..78918a7
--- /dev/null
+++ b/include/linux/nvme-fc-driver.h
@@ -0,0 +1,823 @@
+/*
+ * 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:
+ * @fabric_name: FC Fabric name the port is connected to. If connection is
+ * point-to-point (no switch) use srcport WWPN. If no current
+ * Link Up, set to 0.
+ * @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;
+ u64 fabric_name;
+ 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)
+ * @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;
+
+ 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.
+ * @fabric_name: FC Fabric name the port is connected to. If connection is
+ * point-to-point (no switch) use srcport WWPN. If no current
+ * Link Up, 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;
+ u64 fabric_name;
+ 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:
+ *
+ * @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.
+ *
+ * @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 */
+ 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 *);
+
+ 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:
+ * @fabric_name: FC Fabric name the port is connected to. If connection is
+ * point-to-point (no switch) use srcport WWPN. If no current
+ * Link Up, set to 0.
+ * @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;
+
+ u64 fabric_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 */
+};
+
+/**
+ * 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)
+ * @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.
+ * @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;
+ u32 offset;
+ u32 timeout;
+ u32 transfer_length;
+ 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.
+ */
+};
+
+
+/**
+ * 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.
+ * @fabric_name: FC Fabric name the port is connected to. If connection is
+ * point-to-point (no switch) use srcport WWPN. If no current
+ * Link Up, 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;
+ u64 fabric_name;
+ 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:
+ *
+ * @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.
+ * 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 {
+ 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 */
+
--
2.5.0
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH 3/7] nvme-fabrics: Add FC transport LLDD api definitions
2016-10-04 6:26 [PATCH 3/7] nvme-fabrics: Add FC transport LLDD api definitions James Smart
@ 2016-10-04 7:36 ` Hannes Reinecke
2016-10-05 23:25 ` James Smart
0 siblings, 1 reply; 4+ messages in thread
From: Hannes Reinecke @ 2016-10-04 7:36 UTC (permalink / raw)
On 10/04/2016 08:26 AM, James Smart wrote:
>
> 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.
>
> (Patch unchanged from prior posting)
>
> Signed-off-by: James Smart <james.smart at broadcom.com>
> Acked-by: Johannes Thumshirn <jth at kernel.org>
> Acked-by: Jay Freyensee <james_p_freyensee at linux.intel.com>
> Reviewed-by: Christoph Hellwig <hch at lst.de>
> ---
> include/linux/nvme-fc-driver.h | 823 +++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 823 insertions(+)
> create mode 100644 include/linux/nvme-fc-driver.h
>
We really need to work on integration with the SCSI FC code.
But I'd rather see to get this in first.
So:
Reviewed-by: Hannes Reinecke <hare at suse.com>
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
hare at suse.de +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 N?rnberg
GF: J. Hawn, J. Guild, F. Imend?rffer, HRB 16746 (AG N?rnberg)
^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH 3/7] nvme-fabrics: Add FC transport LLDD api definitions
2016-10-04 7:36 ` Hannes Reinecke
@ 2016-10-05 23:25 ` James Smart
2016-10-06 6:30 ` Hannes Reinecke
0 siblings, 1 reply; 4+ messages in thread
From: James Smart @ 2016-10-05 23:25 UTC (permalink / raw)
On 10/4/2016 12:36 AM, Hannes Reinecke wrote:
> We really need to work on integration with the SCSI FC code.
> But I'd rather see to get this in first.
> So:
>
> Reviewed-by: Hannes Reinecke <hare at suse.com>
>
> Cheers,
>
> Hannes
I would not hold this up based on merging the scsi fc transport with the
nvme fc transport - for topology items. We can do this eventually, and
it'll really change how things are layered with scsi (flips the fc
transport devices/objects closer to the root device than the scsi host),
making it very different from other scsi transports as well. lots of
code change, especially to LLDD's. Not something done lightly.
-- james
^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH 3/7] nvme-fabrics: Add FC transport LLDD api definitions
2016-10-05 23:25 ` James Smart
@ 2016-10-06 6:30 ` Hannes Reinecke
0 siblings, 0 replies; 4+ messages in thread
From: Hannes Reinecke @ 2016-10-06 6:30 UTC (permalink / raw)
On 10/06/2016 01:25 AM, James Smart wrote:
>
>
> On 10/4/2016 12:36 AM, Hannes Reinecke wrote:
>> We really need to work on integration with the SCSI FC code.
>> But I'd rather see to get this in first.
>> So:
>>
>> Reviewed-by: Hannes Reinecke <hare at suse.com>
>>
>> Cheers,
>>
>> Hannes
>
> I would not hold this up based on merging the scsi fc transport with the
> nvme fc transport - for topology items. We can do this eventually, and
> it'll really change how things are layered with scsi (flips the fc
> transport devices/objects closer to the root device than the scsi host),
> making it very different from other scsi transports as well. lots of
> code change, especially to LLDD's. Not something done lightly.
>
In the light of your explanation of the previous patch I agree with you.
We should be looking into integration, but this should be done at a
later step. Especially as nvmet has similar issues right now.
So I retract my objection.
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
hare at suse.de +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 N?rnberg
GF: J. Hawn, J. Guild, F. Imend?rffer, HRB 16746 (AG N?rnberg)
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2016-10-06 6:30 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2016-10-04 6:26 [PATCH 3/7] nvme-fabrics: Add FC transport LLDD api definitions James Smart
2016-10-04 7:36 ` Hannes Reinecke
2016-10-05 23:25 ` James Smart
2016-10-06 6:30 ` Hannes Reinecke
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