| Christof Schmitt | 4318e08 | 2009-11-24 16:54:08 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * zfcp device driver |
| 3 | * |
| 4 | * Fibre Channel related definitions and inline functions for the zfcp |
| 5 | * device driver |
| 6 | * |
| 7 | * Copyright IBM Corporation 2009 |
| 8 | */ |
| 9 | |
| 10 | #ifndef ZFCP_FC_H |
| 11 | #define ZFCP_FC_H |
| 12 | |
| 13 | #include <scsi/fc/fc_fcp.h> |
| 14 | #include <scsi/scsi_cmnd.h> |
| 15 | #include <scsi/scsi_tcq.h> |
| 16 | |
| 17 | /** |
| 18 | * zfcp_fc_scsi_to_fcp - setup FCP command with data from scsi_cmnd |
| 19 | * @fcp: fcp_cmnd to setup |
| 20 | * @scsi: scsi_cmnd where to get LUN, task attributes/flags and CDB |
| 21 | */ |
| 22 | static inline |
| 23 | void zfcp_fc_scsi_to_fcp(struct fcp_cmnd *fcp, struct scsi_cmnd *scsi) |
| 24 | { |
| 25 | char tag[2]; |
| 26 | |
| 27 | int_to_scsilun(scsi->device->lun, (struct scsi_lun *) &fcp->fc_lun); |
| 28 | |
| 29 | if (scsi_populate_tag_msg(scsi, tag)) { |
| 30 | switch (tag[0]) { |
| 31 | case MSG_ORDERED_TAG: |
| 32 | fcp->fc_pri_ta |= FCP_PTA_ORDERED; |
| 33 | break; |
| 34 | case MSG_SIMPLE_TAG: |
| 35 | fcp->fc_pri_ta |= FCP_PTA_SIMPLE; |
| 36 | break; |
| 37 | }; |
| 38 | } else |
| 39 | fcp->fc_pri_ta = FCP_PTA_SIMPLE; |
| 40 | |
| 41 | if (scsi->sc_data_direction == DMA_FROM_DEVICE) |
| 42 | fcp->fc_flags |= FCP_CFL_RDDATA; |
| 43 | if (scsi->sc_data_direction == DMA_TO_DEVICE) |
| 44 | fcp->fc_flags |= FCP_CFL_WRDATA; |
| 45 | |
| 46 | memcpy(fcp->fc_cdb, scsi->cmnd, scsi->cmd_len); |
| 47 | |
| 48 | fcp->fc_dl = scsi_bufflen(scsi); |
| 49 | } |
| 50 | |
| 51 | /** |
| 52 | * zfcp_fc_fcp_tm - setup FCP command as task management command |
| 53 | * @fcp: fcp_cmnd to setup |
| 54 | * @dev: scsi_device where to send the task management command |
| 55 | * @tm: task management flags to setup tm command |
| 56 | */ |
| 57 | static inline |
| 58 | void zfcp_fc_fcp_tm(struct fcp_cmnd *fcp, struct scsi_device *dev, u8 tm_flags) |
| 59 | { |
| 60 | int_to_scsilun(dev->lun, (struct scsi_lun *) &fcp->fc_lun); |
| 61 | fcp->fc_tm_flags |= tm_flags; |
| 62 | } |
| 63 | |
| 64 | /** |
| 65 | * zfcp_fc_evap_fcp_rsp - evaluate FCP RSP IU and update scsi_cmnd accordingly |
| 66 | * @fcp_rsp: FCP RSP IU to evaluate |
| 67 | * @scsi: SCSI command where to update status and sense buffer |
| 68 | */ |
| 69 | static inline |
| 70 | void zfcp_fc_eval_fcp_rsp(struct fcp_resp_with_ext *fcp_rsp, |
| 71 | struct scsi_cmnd *scsi) |
| 72 | { |
| 73 | struct fcp_resp_rsp_info *rsp_info; |
| 74 | char *sense; |
| 75 | u32 sense_len, resid; |
| 76 | u8 rsp_flags; |
| 77 | |
| 78 | set_msg_byte(scsi, COMMAND_COMPLETE); |
| 79 | scsi->result |= fcp_rsp->resp.fr_status; |
| 80 | |
| 81 | rsp_flags = fcp_rsp->resp.fr_flags; |
| 82 | |
| 83 | if (unlikely(rsp_flags & FCP_RSP_LEN_VAL)) { |
| 84 | rsp_info = (struct fcp_resp_rsp_info *) &fcp_rsp[1]; |
| 85 | if (rsp_info->rsp_code == FCP_TMF_CMPL) |
| 86 | set_host_byte(scsi, DID_OK); |
| 87 | else { |
| 88 | set_host_byte(scsi, DID_ERROR); |
| 89 | return; |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | if (unlikely(rsp_flags & FCP_SNS_LEN_VAL)) { |
| 94 | sense = (char *) &fcp_rsp[1]; |
| 95 | if (rsp_flags & FCP_RSP_LEN_VAL) |
| 96 | sense += fcp_rsp->ext.fr_sns_len; |
| 97 | sense_len = min(fcp_rsp->ext.fr_sns_len, |
| 98 | (u32) SCSI_SENSE_BUFFERSIZE); |
| 99 | memcpy(scsi->sense_buffer, sense, sense_len); |
| 100 | } |
| 101 | |
| 102 | if (unlikely(rsp_flags & FCP_RESID_UNDER)) { |
| 103 | resid = fcp_rsp->ext.fr_resid; |
| 104 | scsi_set_resid(scsi, resid); |
| 105 | if (scsi_bufflen(scsi) - resid < scsi->underflow && |
| 106 | !(rsp_flags & FCP_SNS_LEN_VAL) && |
| 107 | fcp_rsp->resp.fr_status == SAM_STAT_GOOD) |
| 108 | set_host_byte(scsi, DID_ERROR); |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | #endif |