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1045 lines
46 KiB
1045 lines
46 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* Copyright (c) 2016, Avago Technologies |
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*/ |
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#ifndef _NVME_FC_DRIVER_H |
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#define _NVME_FC_DRIVER_H 1 |
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#include <linux/scatterlist.h> |
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/* |
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* ********************** FC-NVME LS API ******************** |
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* |
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* Data structures used by both FC-NVME hosts and FC-NVME |
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* targets to perform FC-NVME LS requests or transmit |
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* responses. |
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* |
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* *********************************************************** |
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*/ |
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/** |
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* struct nvmefc_ls_req - Request structure passed from the transport |
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* to the LLDD to perform a NVME-FC LS request and obtain |
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* a response. |
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* Used by nvme-fc transport (host) to send LS's such as |
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* Create Association, Create Connection and Disconnect |
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* Association. |
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* Used by the nvmet-fc transport (controller) to send |
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* LS's such as Disconnect Association. |
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* |
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* Values set by the requestor prior to calling the LLDD ls_req entrypoint: |
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* @rqstaddr: pointer to request buffer |
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* @rqstdma: PCI DMA address of request buffer |
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* @rqstlen: Length, in bytes, of request buffer |
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* @rspaddr: pointer to response buffer |
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* @rspdma: PCI DMA address of response buffer |
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* @rsplen: Length, in bytes, of response buffer |
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* @timeout: Maximum amount of time, in seconds, to wait for the LS response. |
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* If timeout exceeded, LLDD to abort LS exchange and complete |
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* LS request with error status. |
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* @private: pointer to memory allocated alongside the ls request structure |
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* that is specifically for the LLDD to use while processing the |
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* request. The length of the buffer corresponds to the |
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* lsrqst_priv_sz value specified in the xxx_template supplied |
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* by the LLDD. |
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* @done: The callback routine the LLDD is to invoke upon completion of |
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* the LS request. req argument is the pointer to the original LS |
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* request structure. Status argument must be 0 upon success, a |
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* negative errno on failure (example: -ENXIO). |
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*/ |
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struct nvmefc_ls_req { |
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void *rqstaddr; |
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dma_addr_t rqstdma; |
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u32 rqstlen; |
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void *rspaddr; |
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dma_addr_t rspdma; |
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u32 rsplen; |
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u32 timeout; |
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void *private; |
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void (*done)(struct nvmefc_ls_req *req, int status); |
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} __aligned(sizeof(u64)); /* alignment for other things alloc'd with */ |
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/** |
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* struct nvmefc_ls_rsp - Structure passed from the transport to the LLDD |
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* to request the transmit the NVME-FC LS response to a |
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* NVME-FC LS request. The structure originates in the LLDD |
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* and is given to the transport via the xxx_rcv_ls_req() |
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* transport routine. As such, the structure represents the |
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* FC exchange context for the NVME-FC LS request that was |
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* received and which the response is to be sent for. |
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* Used by the LLDD to pass the nvmet-fc transport (controller) |
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* received LS's such as Create Association, Create Connection |
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* and Disconnect Association. |
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* Used by the LLDD to pass the nvme-fc transport (host) |
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* received LS's such as Disconnect Association or Disconnect |
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* Connection. |
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* |
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* The structure is allocated by the LLDD whenever a LS Request is received |
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* from the FC link. The address of the structure is passed to the nvmet-fc |
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* or nvme-fc layer via the xxx_rcv_ls_req() transport routines. |
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* |
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* The address of the structure is to be passed back to the LLDD |
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* when the response is to be transmit. The LLDD will use the address to |
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* map back to the LLDD exchange structure which maintains information such |
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* the remote N_Port that sent the LS as well as any FC exchange context. |
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* Upon completion of the LS response transmit, the LLDD will pass the |
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* address of the structure back to the transport LS rsp done() routine, |
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* allowing the transport release dma resources. Upon completion of |
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* the done() routine, no further access to the structure will be made by |
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* the transport and the LLDD can de-allocate the structure. |
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* |
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* Field initialization: |
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* At the time of the xxx_rcv_ls_req() call, there is no content that |
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* is valid in the structure. |
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* |
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* When the structure is used for the LLDD->xmt_ls_rsp() call, the |
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* transport layer will fully set the fields in order to specify the |
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* response payload buffer and its length as well as the done routine |
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* to be called upon completion of the transmit. The transport layer |
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* will also set a private pointer for its own use in the done routine. |
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* |
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* Values set by the transport layer prior to calling the LLDD xmt_ls_rsp |
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* entrypoint: |
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* @rspbuf: pointer to the LS response buffer |
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* @rspdma: PCI DMA address of the LS response buffer |
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* @rsplen: Length, in bytes, of the LS response buffer |
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* @done: The callback routine the LLDD is to invoke upon completion of |
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* transmitting the LS response. req argument is the pointer to |
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* the original ls request. |
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* @nvme_fc_private: pointer to an internal transport-specific structure |
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* used as part of the transport done() processing. The LLDD is |
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* not to access this pointer. |
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*/ |
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struct nvmefc_ls_rsp { |
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void *rspbuf; |
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dma_addr_t rspdma; |
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u16 rsplen; |
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void (*done)(struct nvmefc_ls_rsp *rsp); |
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void *nvme_fc_private; /* LLDD is not to access !! */ |
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}; |
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/* |
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* ********************** LLDD FC-NVME Host API ******************** |
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* |
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* For FC LLDD's that are the NVME Host role. |
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* |
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* ****************************************************************** |
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*/ |
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/** |
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* struct nvme_fc_port_info - port-specific ids and FC connection-specific |
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* data element used during NVME Host role |
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* registrations |
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* |
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* Static fields describing the port being registered: |
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* @node_name: FC WWNN for the port |
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* @port_name: FC WWPN for the port |
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* @port_role: What NVME roles are supported (see FC_PORT_ROLE_xxx) |
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* @dev_loss_tmo: maximum delay for reconnects to an association on |
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* this device. Used only on a remoteport. |
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* |
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* Initialization values for dynamic port fields: |
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* @port_id: FC N_Port_ID currently assigned the port. Upper 8 bits must |
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* be set to 0. |
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*/ |
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struct nvme_fc_port_info { |
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u64 node_name; |
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u64 port_name; |
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u32 port_role; |
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u32 port_id; |
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u32 dev_loss_tmo; |
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}; |
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enum nvmefc_fcp_datadir { |
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NVMEFC_FCP_NODATA, /* payload_length and sg_cnt will be zero */ |
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NVMEFC_FCP_WRITE, |
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NVMEFC_FCP_READ, |
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}; |
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/** |
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* struct nvmefc_fcp_req - Request structure passed from NVME-FC transport |
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* to LLDD in order to perform a NVME FCP IO operation. |
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* |
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* Values set by the NVME-FC layer prior to calling the LLDD fcp_io |
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* entrypoint. |
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* @cmdaddr: pointer to the FCP CMD IU buffer |
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* @rspaddr: pointer to the FCP RSP IU buffer |
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* @cmddma: PCI DMA address of the FCP CMD IU buffer |
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* @rspdma: PCI DMA address of the FCP RSP IU buffer |
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* @cmdlen: Length, in bytes, of the FCP CMD IU buffer |
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* @rsplen: Length, in bytes, of the FCP RSP IU buffer |
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* @payload_length: Length of DATA_IN or DATA_OUT payload data to transfer |
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* @sg_table: scatter/gather structure for payload data |
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* @first_sgl: memory for 1st scatter/gather list segment for payload data |
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* @sg_cnt: number of elements in the scatter/gather list |
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* @io_dir: direction of the FCP request (see NVMEFC_FCP_xxx) |
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* @sqid: The nvme SQID the command is being issued on |
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* @done: The callback routine the LLDD is to invoke upon completion of |
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* the FCP operation. req argument is the pointer to the original |
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* FCP IO operation. |
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* @private: pointer to memory allocated alongside the FCP operation |
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* request structure that is specifically for the LLDD to use |
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* while processing the operation. The length of the buffer |
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* corresponds to the fcprqst_priv_sz value specified in the |
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* nvme_fc_port_template supplied by the LLDD. |
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* |
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* Values set by the LLDD indicating completion status of the FCP operation. |
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* Must be set prior to calling the done() callback. |
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* @transferred_length: amount of payload data, in bytes, that were |
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* transferred. Should equal payload_length on success. |
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* @rcv_rsplen: length, in bytes, of the FCP RSP IU received. |
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* @status: Completion status of the FCP operation. must be 0 upon success, |
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* negative errno value upon failure (ex: -EIO). Note: this is |
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* NOT a reflection of the NVME CQE completion status. Only the |
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* status of the FCP operation at the NVME-FC level. |
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*/ |
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struct nvmefc_fcp_req { |
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void *cmdaddr; |
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void *rspaddr; |
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dma_addr_t cmddma; |
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dma_addr_t rspdma; |
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u16 cmdlen; |
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u16 rsplen; |
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u32 payload_length; |
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struct sg_table sg_table; |
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struct scatterlist *first_sgl; |
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int sg_cnt; |
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enum nvmefc_fcp_datadir io_dir; |
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__le16 sqid; |
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void (*done)(struct nvmefc_fcp_req *req); |
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void *private; |
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u32 transferred_length; |
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u16 rcv_rsplen; |
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u32 status; |
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} __aligned(sizeof(u64)); /* alignment for other things alloc'd with */ |
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/* |
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* Direct copy of fc_port_state enum. For later merging |
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*/ |
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enum nvme_fc_obj_state { |
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FC_OBJSTATE_UNKNOWN, |
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FC_OBJSTATE_NOTPRESENT, |
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FC_OBJSTATE_ONLINE, |
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FC_OBJSTATE_OFFLINE, /* User has taken Port Offline */ |
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FC_OBJSTATE_BLOCKED, |
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FC_OBJSTATE_BYPASSED, |
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FC_OBJSTATE_DIAGNOSTICS, |
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FC_OBJSTATE_LINKDOWN, |
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FC_OBJSTATE_ERROR, |
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FC_OBJSTATE_LOOPBACK, |
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FC_OBJSTATE_DELETED, |
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}; |
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/** |
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* struct nvme_fc_local_port - structure used between NVME-FC transport and |
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* a LLDD to reference a local NVME host port. |
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* Allocated/created by the nvme_fc_register_localport() |
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* transport interface. |
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* |
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* Fields with static values for the port. Initialized by the |
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* port_info struct supplied to the registration call. |
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* @port_num: NVME-FC transport host port number |
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* @port_role: NVME roles are supported on the port (see FC_PORT_ROLE_xxx) |
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* @node_name: FC WWNN for the port |
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* @port_name: FC WWPN for the port |
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* @private: pointer to memory allocated alongside the local port |
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* structure that is specifically for the LLDD to use. |
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* The length of the buffer corresponds to the local_priv_sz |
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* value specified in the nvme_fc_port_template supplied by |
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* the LLDD. |
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* @dev_loss_tmo: maximum delay for reconnects to an association on |
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* this device. To modify, lldd must call |
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* nvme_fc_set_remoteport_devloss(). |
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* |
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* Fields with dynamic values. Values may change base on link state. LLDD |
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* may reference fields directly to change them. Initialized by the |
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* port_info struct supplied to the registration call. |
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* @port_id: FC N_Port_ID currently assigned the port. Upper 8 bits must |
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* be set to 0. |
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* @port_state: Operational state of the port. |
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*/ |
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struct nvme_fc_local_port { |
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/* static/read-only fields */ |
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u32 port_num; |
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u32 port_role; |
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u64 node_name; |
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u64 port_name; |
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void *private; |
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/* dynamic fields */ |
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u32 port_id; |
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enum nvme_fc_obj_state port_state; |
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} __aligned(sizeof(u64)); /* alignment for other things alloc'd with */ |
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/** |
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* struct nvme_fc_remote_port - structure used between NVME-FC transport and |
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* a LLDD to reference a remote NVME subsystem port. |
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* Allocated/created by the nvme_fc_register_remoteport() |
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* transport interface. |
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* |
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* Fields with static values for the port. Initialized by the |
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* port_info struct supplied to the registration call. |
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* @port_num: NVME-FC transport remote subsystem port number |
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* @port_role: NVME roles are supported on the port (see FC_PORT_ROLE_xxx) |
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* @node_name: FC WWNN for the port |
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* @port_name: FC WWPN for the port |
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* @localport: pointer to the NVME-FC local host port the subsystem is |
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* connected to. |
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* @private: pointer to memory allocated alongside the remote port |
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* structure that is specifically for the LLDD to use. |
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* The length of the buffer corresponds to the remote_priv_sz |
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* value specified in the nvme_fc_port_template supplied by |
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* the LLDD. |
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* |
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* Fields with dynamic values. Values may change base on link or login |
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* state. LLDD may reference fields directly to change them. Initialized by |
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* the port_info struct supplied to the registration call. |
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* @port_id: FC N_Port_ID currently assigned the port. Upper 8 bits must |
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* be set to 0. |
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* @port_state: Operational state of the remote port. Valid values are |
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* ONLINE or UNKNOWN. |
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*/ |
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struct nvme_fc_remote_port { |
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/* static fields */ |
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u32 port_num; |
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u32 port_role; |
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u64 node_name; |
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u64 port_name; |
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struct nvme_fc_local_port *localport; |
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void *private; |
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u32 dev_loss_tmo; |
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/* dynamic fields */ |
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u32 port_id; |
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enum nvme_fc_obj_state port_state; |
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} __aligned(sizeof(u64)); /* alignment for other things alloc'd with */ |
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/** |
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* struct nvme_fc_port_template - structure containing static entrypoints and |
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* operational parameters for an LLDD that supports NVME host |
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* behavior. Passed by reference in port registrations. |
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* NVME-FC transport remembers template reference and may |
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* access it during runtime operation. |
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* |
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* Host/Initiator Transport Entrypoints/Parameters: |
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* |
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* @localport_delete: The LLDD initiates deletion of a localport via |
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* nvme_fc_deregister_localport(). However, the teardown is |
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* asynchronous. This routine is called upon the completion of the |
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* teardown to inform the LLDD that the localport has been deleted. |
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* Entrypoint is Mandatory. |
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* |
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* @remoteport_delete: The LLDD initiates deletion of a remoteport via |
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* nvme_fc_deregister_remoteport(). However, the teardown is |
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* asynchronous. This routine is called upon the completion of the |
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* teardown to inform the LLDD that the remoteport has been deleted. |
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* Entrypoint is Mandatory. |
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* |
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* @create_queue: Upon creating a host<->controller association, queues are |
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* created such that they can be affinitized to cpus/cores. This |
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* callback into the LLDD to notify that a controller queue is being |
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* created. The LLDD may choose to allocate an associated hw queue |
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* or map it onto a shared hw queue. Upon return from the call, the |
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* LLDD specifies a handle that will be given back to it for any |
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* command that is posted to the controller queue. The handle can |
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* be used by the LLDD to map quickly to the proper hw queue for |
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* command execution. The mask of cpu's that will map to this queue |
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* at the block-level is also passed in. The LLDD should use the |
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* queue id and/or cpu masks to ensure proper affinitization of the |
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* controller queue to the hw queue. |
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* Entrypoint is Optional. |
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* |
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* @delete_queue: This is the inverse of the crete_queue. During |
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* host<->controller association teardown, this routine is called |
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* when a controller queue is being terminated. Any association with |
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* a hw queue should be termined. If there is a unique hw queue, the |
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* hw queue should be torn down. |
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* Entrypoint is Optional. |
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* |
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* @poll_queue: Called to poll for the completion of an io on a blk queue. |
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* Entrypoint is Optional. |
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* |
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* @ls_req: Called to issue a FC-NVME FC-4 LS service request. |
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* The nvme_fc_ls_req structure will fully describe the buffers for |
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* the request payload and where to place the response payload. The |
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* LLDD is to allocate an exchange, issue the LS request, obtain the |
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* LS response, and call the "done" routine specified in the request |
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* structure (argument to done is the ls request structure itself). |
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* Entrypoint is Mandatory. |
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* |
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* @fcp_io: called to issue a FC-NVME I/O request. The I/O may be for |
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* an admin queue or an i/o queue. The nvmefc_fcp_req structure will |
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* fully describe the io: the buffer containing the FC-NVME CMD IU |
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* (which contains the SQE), the sg list for the payload if applicable, |
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* and the buffer to place the FC-NVME RSP IU into. The LLDD will |
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* complete the i/o, indicating the amount of data transferred or |
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* any transport error, and call the "done" routine specified in the |
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* request structure (argument to done is the fcp request structure |
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* itself). |
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* Entrypoint is Mandatory. |
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* |
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* @ls_abort: called to request the LLDD to abort the indicated ls request. |
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* The call may return before the abort has completed. After aborting |
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* the request, the LLDD must still call the ls request done routine |
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* indicating an FC transport Aborted status. |
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* Entrypoint is Mandatory. |
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* |
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* @fcp_abort: called to request the LLDD to abort the indicated fcp request. |
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* The call may return before the abort has completed. After aborting |
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* the request, the LLDD must still call the fcp request done routine |
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* indicating an FC transport Aborted status. |
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* Entrypoint is Mandatory. |
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* |
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* @xmt_ls_rsp: Called to transmit the response to a FC-NVME FC-4 LS service. |
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* The nvmefc_ls_rsp structure is the same LLDD-supplied exchange |
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* structure specified in the nvme_fc_rcv_ls_req() call made when |
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* the LS request was received. The structure will fully describe |
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* the buffers for the response payload and the dma address of the |
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* payload. The LLDD is to transmit the response (or return a |
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* non-zero errno status), and upon completion of the transmit, call |
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* the "done" routine specified in the nvmefc_ls_rsp structure |
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* (argument to done is the address of the nvmefc_ls_rsp structure |
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* itself). Upon the completion of the done routine, the LLDD shall |
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* consider the LS handling complete and the nvmefc_ls_rsp structure |
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* may be freed/released. |
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* Entrypoint is mandatory if the LLDD calls the nvme_fc_rcv_ls_req() |
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* entrypoint. |
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* |
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* @max_hw_queues: indicates the maximum number of hw queues the LLDD |
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* supports for cpu affinitization. |
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* Value is Mandatory. Must be at least 1. |
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* |
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* @max_sgl_segments: indicates the maximum number of sgl segments supported |
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* by the LLDD |
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* Value is Mandatory. Must be at least 1. Recommend at least 256. |
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* |
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* @max_dif_sgl_segments: indicates the maximum number of sgl segments |
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* supported by the LLDD for DIF operations. |
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* Value is Mandatory. Must be at least 1. Recommend at least 256. |
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* |
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* @dma_boundary: indicates the dma address boundary where dma mappings |
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* will be split across. |
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* Value is Mandatory. Typical value is 0xFFFFFFFF to split across |
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* 4Gig address boundarys |
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* |
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* @local_priv_sz: The LLDD sets this field to the amount of additional |
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* memory that it would like fc nvme layer to allocate on the LLDD's |
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* behalf whenever a localport is allocated. The additional memory |
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* area solely for the of the LLDD and its location is specified by |
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* the localport->private pointer. |
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* Value is Mandatory. Allowed to be zero. |
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* |
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* @remote_priv_sz: The LLDD sets this field to the amount of additional |
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* memory that it would like fc nvme layer to allocate on the LLDD's |
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* behalf whenever a remoteport is allocated. The additional memory |
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* area solely for the of the LLDD and its location is specified by |
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* the remoteport->private pointer. |
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* Value is Mandatory. Allowed to be zero. |
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* |
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* @lsrqst_priv_sz: The LLDD sets this field to the amount of additional |
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* memory that it would like fc nvme layer to allocate on the LLDD's |
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* behalf whenever a ls request structure is allocated. The additional |
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* memory area is solely for use by the LLDD and its location is |
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* specified by the ls_request->private pointer. |
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* Value is Mandatory. Allowed to be zero. |
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* |
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* @fcprqst_priv_sz: The LLDD sets this field to the amount of additional |
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* memory that it would like fc nvme layer to allocate on the LLDD's |
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* behalf whenever a fcp request structure is allocated. The additional |
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* memory area solely for the of the LLDD and its location is |
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* specified by the fcp_request->private pointer. |
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* Value is Mandatory. Allowed to be zero. |
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*/ |
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struct nvme_fc_port_template { |
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/* initiator-based functions */ |
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void (*localport_delete)(struct nvme_fc_local_port *); |
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void (*remoteport_delete)(struct nvme_fc_remote_port *); |
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int (*create_queue)(struct nvme_fc_local_port *, |
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unsigned int qidx, u16 qsize, |
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void **handle); |
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void (*delete_queue)(struct nvme_fc_local_port *, |
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unsigned int qidx, void *handle); |
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int (*ls_req)(struct nvme_fc_local_port *, |
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struct nvme_fc_remote_port *, |
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struct nvmefc_ls_req *); |
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int (*fcp_io)(struct nvme_fc_local_port *, |
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struct nvme_fc_remote_port *, |
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void *hw_queue_handle, |
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struct nvmefc_fcp_req *); |
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void (*ls_abort)(struct nvme_fc_local_port *, |
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struct nvme_fc_remote_port *, |
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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, |
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struct nvmefc_ls_rsp *ls_rsp); |
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int (*fcp_op)(struct nvmet_fc_target_port *tgtport, |
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struct nvmefc_tgt_fcp_req *fcpreq); |
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void (*fcp_abort)(struct nvmet_fc_target_port *tgtport, |
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struct nvmefc_tgt_fcp_req *fcpreq); |
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void (*fcp_req_release)(struct nvmet_fc_target_port *tgtport, |
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struct nvmefc_tgt_fcp_req *fcpreq); |
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void (*defer_rcv)(struct nvmet_fc_target_port *tgtport, |
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struct nvmefc_tgt_fcp_req *fcpreq); |
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void (*discovery_event)(struct nvmet_fc_target_port *tgtport); |
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int (*ls_req)(struct nvmet_fc_target_port *targetport, |
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void *hosthandle, struct nvmefc_ls_req *lsreq); |
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void (*ls_abort)(struct nvmet_fc_target_port *targetport, |
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void *hosthandle, struct nvmefc_ls_req *lsreq); |
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void (*host_release)(void *hosthandle); |
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u32 max_hw_queues; |
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u16 max_sgl_segments; |
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u16 max_dif_sgl_segments; |
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u64 dma_boundary; |
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u32 target_features; |
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/* sizes of additional private data for data structures */ |
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u32 target_priv_sz; |
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u32 lsrqst_priv_sz; |
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}; |
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int nvmet_fc_register_targetport(struct nvmet_fc_port_info *portinfo, |
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struct nvmet_fc_target_template *template, |
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struct device *dev, |
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struct nvmet_fc_target_port **tgtport_p); |
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int nvmet_fc_unregister_targetport(struct nvmet_fc_target_port *tgtport); |
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/* |
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* Routine called to pass a NVME-FC LS request, received by the lldd, |
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* to the nvmet-fc transport. |
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* |
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* If the return value is zero: the LS was successfully accepted by the |
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* transport. |
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* If the return value is non-zero: the transport has not accepted the |
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* LS. The lldd should ABTS-LS the LS. |
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* |
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* Note: if the LLDD receives and ABTS for the LS prior to the transport |
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* calling the ops->xmt_ls_rsp() routine to transmit a response, the LLDD |
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* shall mark the LS as aborted, and when the xmt_ls_rsp() is called: the |
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* response shall not be transmit and the struct nvmefc_ls_rsp() done |
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* routine shall be called. The LLDD may transmit the ABTS response as |
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* soon as the LS was marked or can delay until the xmt_ls_rsp() call is |
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* made. |
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* Note: if an RCV LS was successfully posted to the transport and the |
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* targetport is then unregistered before xmt_ls_rsp() was called for |
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* the lsrsp structure, the transport will still call xmt_ls_rsp() |
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* afterward to cleanup the outstanding lsrsp structure. The LLDD should |
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* noop the transmission of the rsp and call the lsrsp->done() routine |
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* to allow the lsrsp structure to be released. |
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*/ |
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int nvmet_fc_rcv_ls_req(struct nvmet_fc_target_port *tgtport, |
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void *hosthandle, |
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struct nvmefc_ls_rsp *rsp, |
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void *lsreqbuf, u32 lsreqbuf_len); |
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/* |
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* Routine called by the LLDD whenever it has a logout or loss of |
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* connectivity to a NVME-FC host port which there had been active |
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* NVMe controllers for. The host port is indicated by the |
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* hosthandle. The hosthandle is given to the nvmet-fc transport |
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* when a NVME LS was received, typically to create a new association. |
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* The nvmet-fc transport will cache the hostport value with the |
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* association for use in LS requests for the association. |
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* When the LLDD calls this routine, the nvmet-fc transport will |
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* immediately terminate all associations that were created with |
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* the hosthandle host port. |
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* The LLDD, after calling this routine and having control returned, |
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* must assume the transport may subsequently utilize hosthandle as |
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* part of sending LS's to terminate the association. The LLDD |
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* should reject the LS's if they are attempted. |
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* Once the last association has terminated for the hosthandle host |
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* port, the nvmet-fc transport will call the ops->host_release() |
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* callback. As of the callback, the nvmet-fc transport will no |
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* longer reference hosthandle. |
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*/ |
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void nvmet_fc_invalidate_host(struct nvmet_fc_target_port *tgtport, |
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void *hosthandle); |
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/* |
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* If nvmet_fc_rcv_fcp_req returns non-zero, the transport has not accepted |
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* the FCP cmd. The lldd should ABTS-LS the cmd. |
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*/ |
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int nvmet_fc_rcv_fcp_req(struct nvmet_fc_target_port *tgtport, |
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struct nvmefc_tgt_fcp_req *fcpreq, |
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void *cmdiubuf, u32 cmdiubuf_len); |
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void nvmet_fc_rcv_fcp_abort(struct nvmet_fc_target_port *tgtport, |
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struct nvmefc_tgt_fcp_req *fcpreq); |
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#endif /* _NVME_FC_DRIVER_H */
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