113 lines
2.8 KiB
C
113 lines
2.8 KiB
C
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/*
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* zfcp device driver
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*
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* Fibre Channel related definitions and inline functions for the zfcp
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* device driver
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*
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* Copyright IBM Corporation 2009
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*/
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#ifndef ZFCP_FC_H
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#define ZFCP_FC_H
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#include <scsi/fc/fc_fcp.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_tcq.h>
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/**
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* zfcp_fc_scsi_to_fcp - setup FCP command with data from scsi_cmnd
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* @fcp: fcp_cmnd to setup
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* @scsi: scsi_cmnd where to get LUN, task attributes/flags and CDB
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*/
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static inline
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void zfcp_fc_scsi_to_fcp(struct fcp_cmnd *fcp, struct scsi_cmnd *scsi)
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{
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char tag[2];
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int_to_scsilun(scsi->device->lun, (struct scsi_lun *) &fcp->fc_lun);
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if (scsi_populate_tag_msg(scsi, tag)) {
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switch (tag[0]) {
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case MSG_ORDERED_TAG:
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fcp->fc_pri_ta |= FCP_PTA_ORDERED;
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break;
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case MSG_SIMPLE_TAG:
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fcp->fc_pri_ta |= FCP_PTA_SIMPLE;
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break;
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};
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} else
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fcp->fc_pri_ta = FCP_PTA_SIMPLE;
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if (scsi->sc_data_direction == DMA_FROM_DEVICE)
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fcp->fc_flags |= FCP_CFL_RDDATA;
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if (scsi->sc_data_direction == DMA_TO_DEVICE)
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fcp->fc_flags |= FCP_CFL_WRDATA;
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memcpy(fcp->fc_cdb, scsi->cmnd, scsi->cmd_len);
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fcp->fc_dl = scsi_bufflen(scsi);
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}
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/**
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* zfcp_fc_fcp_tm - setup FCP command as task management command
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* @fcp: fcp_cmnd to setup
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* @dev: scsi_device where to send the task management command
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* @tm: task management flags to setup tm command
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*/
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static inline
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void zfcp_fc_fcp_tm(struct fcp_cmnd *fcp, struct scsi_device *dev, u8 tm_flags)
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{
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int_to_scsilun(dev->lun, (struct scsi_lun *) &fcp->fc_lun);
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fcp->fc_tm_flags |= tm_flags;
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}
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/**
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* zfcp_fc_evap_fcp_rsp - evaluate FCP RSP IU and update scsi_cmnd accordingly
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* @fcp_rsp: FCP RSP IU to evaluate
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* @scsi: SCSI command where to update status and sense buffer
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*/
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static inline
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void zfcp_fc_eval_fcp_rsp(struct fcp_resp_with_ext *fcp_rsp,
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struct scsi_cmnd *scsi)
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{
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struct fcp_resp_rsp_info *rsp_info;
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char *sense;
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u32 sense_len, resid;
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u8 rsp_flags;
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set_msg_byte(scsi, COMMAND_COMPLETE);
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scsi->result |= fcp_rsp->resp.fr_status;
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rsp_flags = fcp_rsp->resp.fr_flags;
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if (unlikely(rsp_flags & FCP_RSP_LEN_VAL)) {
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rsp_info = (struct fcp_resp_rsp_info *) &fcp_rsp[1];
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if (rsp_info->rsp_code == FCP_TMF_CMPL)
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set_host_byte(scsi, DID_OK);
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else {
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set_host_byte(scsi, DID_ERROR);
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return;
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}
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}
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if (unlikely(rsp_flags & FCP_SNS_LEN_VAL)) {
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sense = (char *) &fcp_rsp[1];
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if (rsp_flags & FCP_RSP_LEN_VAL)
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sense += fcp_rsp->ext.fr_sns_len;
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sense_len = min(fcp_rsp->ext.fr_sns_len,
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(u32) SCSI_SENSE_BUFFERSIZE);
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memcpy(scsi->sense_buffer, sense, sense_len);
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}
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if (unlikely(rsp_flags & FCP_RESID_UNDER)) {
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resid = fcp_rsp->ext.fr_resid;
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scsi_set_resid(scsi, resid);
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if (scsi_bufflen(scsi) - resid < scsi->underflow &&
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!(rsp_flags & FCP_SNS_LEN_VAL) &&
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fcp_rsp->resp.fr_status == SAM_STAT_GOOD)
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set_host_byte(scsi, DID_ERROR);
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}
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}
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#endif
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