diff options
Diffstat (limited to 'drivers/s390/scsi/zfcp_fc.h')
-rw-r--r-- | drivers/s390/scsi/zfcp_fc.h | 318 |
1 files changed, 318 insertions, 0 deletions
diff --git a/drivers/s390/scsi/zfcp_fc.h b/drivers/s390/scsi/zfcp_fc.h new file mode 100644 index 000000000..25bebfaa8 --- /dev/null +++ b/drivers/s390/scsi/zfcp_fc.h @@ -0,0 +1,318 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * zfcp device driver + * + * Fibre Channel related definitions and inline functions for the zfcp + * device driver + * + * Copyright IBM Corp. 2009, 2017 + */ + +#ifndef ZFCP_FC_H +#define ZFCP_FC_H + +#include <scsi/fc/fc_els.h> +#include <scsi/fc/fc_fcp.h> +#include <scsi/fc/fc_ns.h> +#include <scsi/scsi_cmnd.h> +#include <scsi/scsi_tcq.h> +#include "zfcp_fsf.h" + +#define ZFCP_FC_CT_SIZE_PAGE (PAGE_SIZE - sizeof(struct fc_ct_hdr)) +#define ZFCP_FC_GPN_FT_ENT_PAGE (ZFCP_FC_CT_SIZE_PAGE \ + / sizeof(struct fc_gpn_ft_resp)) +#define ZFCP_FC_GPN_FT_NUM_BUFS 4 /* memory pages */ + +#define ZFCP_FC_GPN_FT_MAX_SIZE (ZFCP_FC_GPN_FT_NUM_BUFS * PAGE_SIZE \ + - sizeof(struct fc_ct_hdr)) +#define ZFCP_FC_GPN_FT_MAX_ENT (ZFCP_FC_GPN_FT_NUM_BUFS * \ + (ZFCP_FC_GPN_FT_ENT_PAGE + 1)) + +#define ZFCP_FC_CTELS_TMO (2 * FC_DEF_R_A_TOV / 1000) + +/** + * struct zfcp_fc_event - FC HBAAPI event for internal queueing from irq context + * @code: Event code + * @data: Event data + * @list: list_head for zfcp_fc_events list + */ +struct zfcp_fc_event { + enum fc_host_event_code code; + u32 data; + struct list_head list; +}; + +/** + * struct zfcp_fc_events - Infrastructure for posting FC events from irq context + * @list: List for queueing of events from irq context to workqueue + * @list_lock: Lock for event list + * @work: work_struct for forwarding events in workqueue +*/ +struct zfcp_fc_events { + struct list_head list; + spinlock_t list_lock; + struct work_struct work; +}; + +/** + * struct zfcp_fc_gid_pn_req - container for ct header plus gid_pn request + * @ct_hdr: FC GS common transport header + * @gid_pn: GID_PN request + */ +struct zfcp_fc_gid_pn_req { + struct fc_ct_hdr ct_hdr; + struct fc_ns_gid_pn gid_pn; +} __packed; + +/** + * struct zfcp_fc_gid_pn_rsp - container for ct header plus gid_pn response + * @ct_hdr: FC GS common transport header + * @gid_pn: GID_PN response + */ +struct zfcp_fc_gid_pn_rsp { + struct fc_ct_hdr ct_hdr; + struct fc_gid_pn_resp gid_pn; +} __packed; + +/** + * struct zfcp_fc_gpn_ft - container for ct header plus gpn_ft request + * @ct_hdr: FC GS common transport header + * @gpn_ft: GPN_FT request + */ +struct zfcp_fc_gpn_ft_req { + struct fc_ct_hdr ct_hdr; + struct fc_ns_gid_ft gpn_ft; +} __packed; + +/** + * struct zfcp_fc_gspn_req - container for ct header plus GSPN_ID request + * @ct_hdr: FC GS common transport header + * @gspn: GSPN_ID request + */ +struct zfcp_fc_gspn_req { + struct fc_ct_hdr ct_hdr; + struct fc_gid_pn_resp gspn; +} __packed; + +/** + * struct zfcp_fc_gspn_rsp - container for ct header plus GSPN_ID response + * @ct_hdr: FC GS common transport header + * @gspn: GSPN_ID response + * @name: The name string of the GSPN_ID response + */ +struct zfcp_fc_gspn_rsp { + struct fc_ct_hdr ct_hdr; + struct fc_gspn_resp gspn; + char name[FC_SYMBOLIC_NAME_SIZE]; +} __packed; + +/** + * struct zfcp_fc_rspn_req - container for ct header plus RSPN_ID request + * @ct_hdr: FC GS common transport header + * @rspn: RSPN_ID request + * @name: The name string of the RSPN_ID request + */ +struct zfcp_fc_rspn_req { + struct fc_ct_hdr ct_hdr; + struct fc_ns_rspn rspn; + char name[FC_SYMBOLIC_NAME_SIZE]; +} __packed; + +/** + * struct zfcp_fc_req - Container for FC ELS and CT requests sent from zfcp + * @ct_els: data required for issuing fsf command + * @sg_req: scatterlist entry for request data, refers to embedded @u submember + * @sg_rsp: scatterlist entry for response data, refers to embedded @u submember + * @u: request and response specific data + * @u.adisc: ADISC specific data + * @u.adisc.req: ADISC request + * @u.adisc.rsp: ADISC response + * @u.gid_pn: GID_PN specific data + * @u.gid_pn.req: GID_PN request + * @u.gid_pn.rsp: GID_PN response + * @u.gpn_ft: GPN_FT specific data + * @u.gpn_ft.sg_rsp2: GPN_FT response, not embedded here, allocated elsewhere + * @u.gpn_ft.req: GPN_FT request + * @u.gspn: GSPN specific data + * @u.gspn.req: GSPN request + * @u.gspn.rsp: GSPN response + * @u.rspn: RSPN specific data + * @u.rspn.req: RSPN request + * @u.rspn.rsp: RSPN response + */ +struct zfcp_fc_req { + struct zfcp_fsf_ct_els ct_els; + struct scatterlist sg_req; + struct scatterlist sg_rsp; + union { + struct { + struct fc_els_adisc req; + struct fc_els_adisc rsp; + } adisc; + struct { + struct zfcp_fc_gid_pn_req req; + struct zfcp_fc_gid_pn_rsp rsp; + } gid_pn; + struct { + struct scatterlist sg_rsp2[ZFCP_FC_GPN_FT_NUM_BUFS - 1]; + struct zfcp_fc_gpn_ft_req req; + } gpn_ft; + struct { + struct zfcp_fc_gspn_req req; + struct zfcp_fc_gspn_rsp rsp; + } gspn; + struct { + struct zfcp_fc_rspn_req req; + struct fc_ct_hdr rsp; + } rspn; + } u; +}; + +/** + * enum zfcp_fc_wka_status - FC WKA port status in zfcp + * @ZFCP_FC_WKA_PORT_OFFLINE: Port is closed and not in use + * @ZFCP_FC_WKA_PORT_CLOSING: The FSF "close port" request is pending + * @ZFCP_FC_WKA_PORT_OPENING: The FSF "open port" request is pending + * @ZFCP_FC_WKA_PORT_ONLINE: The port is open and the port handle is valid + */ +enum zfcp_fc_wka_status { + ZFCP_FC_WKA_PORT_OFFLINE, + ZFCP_FC_WKA_PORT_CLOSING, + ZFCP_FC_WKA_PORT_OPENING, + ZFCP_FC_WKA_PORT_ONLINE, +}; + +/** + * struct zfcp_fc_wka_port - representation of well-known-address (WKA) FC port + * @adapter: Pointer to adapter structure this WKA port belongs to + * @opened: Wait for completion of open command + * @closed: Wait for completion of close command + * @status: Current status of WKA port + * @refcount: Reference count to keep port open as long as it is in use + * @d_id: FC destination id or well-known-address + * @handle: FSF handle for the open WKA port + * @mutex: Mutex used during opening/closing state changes + * @work: For delaying the closing of the WKA port + */ +struct zfcp_fc_wka_port { + struct zfcp_adapter *adapter; + wait_queue_head_t opened; + wait_queue_head_t closed; + enum zfcp_fc_wka_status status; + atomic_t refcount; + u32 d_id; + u32 handle; + struct mutex mutex; + struct delayed_work work; +}; + +/** + * struct zfcp_fc_wka_ports - Data structures for FC generic services + * @ms: FC Management service + * @ts: FC time service + * @ds: FC directory service + * @as: FC alias service + */ +struct zfcp_fc_wka_ports { + struct zfcp_fc_wka_port ms; + struct zfcp_fc_wka_port ts; + struct zfcp_fc_wka_port ds; + struct zfcp_fc_wka_port as; +}; + +/** + * zfcp_fc_scsi_to_fcp - setup FCP command with data from scsi_cmnd + * @fcp: fcp_cmnd to setup + * @scsi: scsi_cmnd where to get LUN, task attributes/flags and CDB + */ +static inline +void zfcp_fc_scsi_to_fcp(struct fcp_cmnd *fcp, struct scsi_cmnd *scsi) +{ + u32 datalen; + + int_to_scsilun(scsi->device->lun, (struct scsi_lun *) &fcp->fc_lun); + + fcp->fc_pri_ta = FCP_PTA_SIMPLE; + + if (scsi->sc_data_direction == DMA_FROM_DEVICE) + fcp->fc_flags |= FCP_CFL_RDDATA; + if (scsi->sc_data_direction == DMA_TO_DEVICE) + fcp->fc_flags |= FCP_CFL_WRDATA; + + memcpy(fcp->fc_cdb, scsi->cmnd, scsi->cmd_len); + + datalen = scsi_bufflen(scsi); + fcp->fc_dl = cpu_to_be32(datalen); + + if (scsi_get_prot_type(scsi) == SCSI_PROT_DIF_TYPE1) { + datalen += datalen / scsi->device->sector_size * 8; + fcp->fc_dl = cpu_to_be32(datalen); + } +} + +/** + * zfcp_fc_fcp_tm() - Setup FCP command as task management command. + * @fcp: Pointer to FCP_CMND IU to set up. + * @dev: Pointer to SCSI_device where to send the task management command. + * @tm_flags: Task management flags to setup tm command. + */ +static inline +void zfcp_fc_fcp_tm(struct fcp_cmnd *fcp, struct scsi_device *dev, u8 tm_flags) +{ + int_to_scsilun(dev->lun, (struct scsi_lun *) &fcp->fc_lun); + fcp->fc_tm_flags = tm_flags; +} + +/** + * zfcp_fc_evap_fcp_rsp - evaluate FCP RSP IU and update scsi_cmnd accordingly + * @fcp_rsp: FCP RSP IU to evaluate + * @scsi: SCSI command where to update status and sense buffer + */ +static inline +void zfcp_fc_eval_fcp_rsp(struct fcp_resp_with_ext *fcp_rsp, + struct scsi_cmnd *scsi) +{ + struct fcp_resp_rsp_info *rsp_info; + char *sense; + u32 sense_len, resid; + u8 rsp_flags; + + set_msg_byte(scsi, COMMAND_COMPLETE); + scsi->result |= fcp_rsp->resp.fr_status; + + rsp_flags = fcp_rsp->resp.fr_flags; + + if (unlikely(rsp_flags & FCP_RSP_LEN_VAL)) { + rsp_info = (struct fcp_resp_rsp_info *) &fcp_rsp[1]; + if (rsp_info->rsp_code == FCP_TMF_CMPL) + set_host_byte(scsi, DID_OK); + else { + set_host_byte(scsi, DID_ERROR); + return; + } + } + + if (unlikely(rsp_flags & FCP_SNS_LEN_VAL)) { + sense = (char *) &fcp_rsp[1]; + if (rsp_flags & FCP_RSP_LEN_VAL) + sense += be32_to_cpu(fcp_rsp->ext.fr_rsp_len); + sense_len = min_t(u32, be32_to_cpu(fcp_rsp->ext.fr_sns_len), + SCSI_SENSE_BUFFERSIZE); + memcpy(scsi->sense_buffer, sense, sense_len); + } + + if (unlikely(rsp_flags & FCP_RESID_UNDER)) { + resid = be32_to_cpu(fcp_rsp->ext.fr_resid); + scsi_set_resid(scsi, resid); + if (scsi_bufflen(scsi) - resid < scsi->underflow && + !(rsp_flags & FCP_SNS_LEN_VAL) && + fcp_rsp->resp.fr_status == SAM_STAT_GOOD) + set_host_byte(scsi, DID_ERROR); + } else if (unlikely(rsp_flags & FCP_RESID_OVER)) { + /* FCP_DL was not sufficient for SCSI data length */ + if (fcp_rsp->resp.fr_status == SAM_STAT_GOOD) + set_host_byte(scsi, DID_ERROR); + } +} + +#endif |