| /* |
| * zfcp device driver |
| * |
| * Fibre Channel related definitions and inline functions for the zfcp |
| * device driver |
| * |
| * Copyright IBM Corporation 2009 |
| */ |
| |
| #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_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_resp - 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_resp { |
| struct fc_ct_hdr ct_hdr; |
| struct fc_gid_pn_resp gid_pn; |
| } __packed; |
| |
| /** |
| * struct zfcp_fc_gid_pn - everything required in zfcp for gid_pn request |
| * @ct: data passed to zfcp_fsf for issuing fsf request |
| * @sg_req: scatterlist entry for request data |
| * @sg_resp: scatterlist entry for response data |
| * @gid_pn_req: GID_PN request data |
| * @gid_pn_resp: GID_PN response data |
| */ |
| struct zfcp_fc_gid_pn { |
| struct zfcp_fsf_ct_els ct; |
| struct scatterlist sg_req; |
| struct scatterlist sg_resp; |
| struct zfcp_fc_gid_pn_req gid_pn_req; |
| struct zfcp_fc_gid_pn_resp gid_pn_resp; |
| struct zfcp_port *port; |
| }; |
| |
| /** |
| * 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_gpn_ft_resp - container for ct header plus gpn_ft response |
| * @ct_hdr: FC GS common transport header |
| * @gpn_ft: Array of gpn_ft response data to fill one memory page |
| */ |
| struct zfcp_fc_gpn_ft_resp { |
| struct fc_ct_hdr ct_hdr; |
| struct fc_gpn_ft_resp gpn_ft[ZFCP_FC_GPN_FT_ENT_PAGE]; |
| } __packed; |
| |
| /** |
| * struct zfcp_fc_gpn_ft - zfcp data for gpn_ft request |
| * @ct: data passed to zfcp_fsf for issuing fsf request |
| * @sg_req: scatter list entry for gpn_ft request |
| * @sg_resp: scatter list entries for gpn_ft responses (per memory page) |
| */ |
| struct zfcp_fc_gpn_ft { |
| struct zfcp_fsf_ct_els ct; |
| struct scatterlist sg_req; |
| struct scatterlist sg_resp[ZFCP_FC_GPN_FT_NUM_BUFS]; |
| }; |
| |
| /** |
| * struct zfcp_fc_els_adisc - everything required in zfcp for issuing ELS ADISC |
| * @els: data required for issuing els fsf command |
| * @req: scatterlist entry for ELS ADISC request |
| * @resp: scatterlist entry for ELS ADISC response |
| * @adisc_req: ELS ADISC request data |
| * @adisc_resp: ELS ADISC response data |
| */ |
| struct zfcp_fc_els_adisc { |
| struct zfcp_fsf_ct_els els; |
| struct scatterlist req; |
| struct scatterlist resp; |
| struct fc_els_adisc adisc_req; |
| struct fc_els_adisc adisc_resp; |
| }; |
| |
| /** |
| * 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 |
| * @completion_wq: Wait for completion of open/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 completion_wq; |
| 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) |
| { |
| char tag[2]; |
| |
| int_to_scsilun(scsi->device->lun, (struct scsi_lun *) &fcp->fc_lun); |
| |
| if (scsi_populate_tag_msg(scsi, tag)) { |
| switch (tag[0]) { |
| case MSG_ORDERED_TAG: |
| fcp->fc_pri_ta |= FCP_PTA_ORDERED; |
| break; |
| case MSG_SIMPLE_TAG: |
| fcp->fc_pri_ta |= FCP_PTA_SIMPLE; |
| break; |
| }; |
| } else |
| 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); |
| |
| fcp->fc_dl = scsi_bufflen(scsi); |
| } |
| |
| /** |
| * zfcp_fc_fcp_tm - setup FCP command as task management command |
| * @fcp: fcp_cmnd to setup |
| * @dev: scsi_device where to send the task management command |
| * @tm: 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 += fcp_rsp->ext.fr_sns_len; |
| sense_len = min(fcp_rsp->ext.fr_sns_len, |
| (u32) SCSI_SENSE_BUFFERSIZE); |
| memcpy(scsi->sense_buffer, sense, sense_len); |
| } |
| |
| if (unlikely(rsp_flags & FCP_RESID_UNDER)) { |
| resid = 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); |
| } |
| } |
| |
| #endif |