/* $FreeBSD$ */ /* * Qlogic ISP Host Adapter Public Target Interface Structures && Routines *--------------------------------------- * Copyright (c) 2000 by Matthew Jacob * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions, and the following disclaimer, * without modification, immediately at the beginning of the file. * 2. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * Matthew Jacob * Feral Software * mjacob@feral.com */ /* * Required software target mode message and event handling structures. * * The message and event structures are used by the MI layer * to propagate messages and events upstream. */ #ifndef IN_MSGLEN #define IN_MSGLEN 8 #endif typedef struct { void * nt_hba; /* HBA tag */ u_int64_t nt_iid; /* inititator id */ u_int64_t nt_tgt; /* target id */ u_int64_t nt_lun; /* logical unit */ u_int8_t nt_bus; /* bus */ u_int8_t nt_tagtype; /* tag type */ u_int16_t nt_tagval; /* tag value */ u_int8_t nt_msg[IN_MSGLEN]; /* message content */ } tmd_msg_t; typedef struct { void * ev_hba; /* HBA tag */ u_int16_t ev_bus; /* bus */ u_int16_t ev_event; /* type of async event */ } tmd_event_t; /* * Suggested software target mode command handling structure. * * The command structure is one suggested possible MD command structure, * but since the handling of thbis is entirely in the MD layer, there * is no requirement that it be used. * * The cd_private tag should be used by the MD layer to keep a free list * of these structures. Code outside of this driver can then use this * as an to identify it's own unit structures. That is, when not on the MD * layer's freelist, the MD layer should shove into it the identifier * that the outer layer has for it- passed in on an initial QIN_HBA_REG * call (see below). * * The cd_hba tag is a tag that uniquely identifies the HBA this target * mode command is coming from. The outer layer has to pass this back * unchanged to avoid chaos. * * The cd_iid, cd_tgt, cd_lun and cd_bus tags are used to identify the * id of the initiator who sent us a command, the target claim to be, the * lun on the target we claim to be, and the bus instance (for multiple * bus host adapters) that this applies to (consider it an extra Port * parameter). The iid, tgt and lun values are deliberately chosen to be * fat so that, for example, World Wide Names can be used instead of * the units that the Qlogic firmware uses (in the case where the MD * layer maintains a port database, for example). * * The cd_tagtype field specifies what kind of command tag has been * sent with the command. The cd_tagval is the tag's value. * * N.B.: when the MD layer sends this command to outside software * the outside software likely *MUST* return the same cd_tagval that * was in place because this value is likely what the Qlogic f/w uses * to identify a command. * * The cd_cdb contains storage for the passed in command descriptor block. * This is the maximum size we can get out of the Qlogic f/w. There's no * passed in length because whoever decodes the command to act upon it * will know what the appropriate length is. * * The tag cd_lflags are the flags set by the MD driver when it gets * command incoming or when it needs to inform any outside entities * that the last requested action failed. * * The tag cd_hflags should be set by any outside software to indicate * the validity of sense and status fields (defined below) and to indicate * the direction data is expected to move. It is an error to have both * CDFH_DATA_IN and CDFH_DATA_OUT set. * * If the CDFH_STSVALID flag is set, the command should be completed (after * sending any data and/or status). If CDFH_SNSVALID is set and the MD layer * can also handle sending the associated sense data (either back with an * FCP RESPONSE IU for Fibre Channel or otherwise automatically handling a * REQUEST SENSE from the initator for this target/lun), the MD layer will * set the CDFL_SENTSENSE flag on successful transmission of the sense data. * It is an error for the CDFH_SNSVALID bit to be set and CDFH_STSVALID not * to be set. It is an error for the CDFH_SNSVALID be set and the associated * SCSI status (cd_scsi_status) not be set to CHECK CONDITON. * * The tag cd_data points to a data segment to either be filled or * read from depending on the direction of data movement. The tag * is undefined if no data direction is set. The MD layer and outer * layers must agree on the meaning of cd_data. * * The tag cd_totlen is the total data amount expected to be moved * over the life of the command. It may be set by the MD layer, * for example, from the datalen field of an FCP CMND IU unit. If * it shows up in the outer layers set to zero and the indicates * data should be moved, the outer layer should set it to the amount * expected to be moved. * * The tag cd_resid is the total residual of data not transferred. * That is, cd_resid is set up, possibly by the MD layer when it * reads the expected data transfer length from an FCP CMND IU, * to be the total data amount expected to be moved over the life * of the command. As data is successfully moved, this value is * decreased. At the end of a command, any residual indicates the * number of bytes requested but not moved. * * The tag cd_xfrlen is the length of the currently active data transfer. * This allows several interations between any outside software and the * MD layer to move data. * * The reason that total length and total residual have to be tracked * is that fibre channel FCP DATA IU units have to have a relative * offset field. * * N.B.: there is no necessary 1-to-1 correspondence between any one * data transfer segment and the number of CTIOs that will be generated * satisfy the current data transfer segment. It's not also possible to * predict how big a transfer can be before it will be 'too big'. Be * reasonable- a 64KB transfer is 'reasonable'. A 1MB transfer may not * be. A 32MB transfer is unreasonable. The problem here has to do with * how CTIOs can be used to map passed data pointers. In systems which * have page based scatter-gather requirements, each PAGESIZEd chunk will * consume one data segment descriptor- you get 3 or 4 of them per CTIO. * The size of the REQUEST QUEUE you drop a CTIO onto is finite (typically * it's 256, but on some systems it's even smaller, and note you have to * sure this queue with the initiator side of this driver). * * The tags cd_sense and cd_scsi_status are pretty obvious. * * The tag cd_error is to communicate between the MD layer and outer software * the current error conditions. * * The tag cd_reserved pads out the structure to 128 bytes. */ #ifndef _LP64 #if defined(__alpha__) || defined(__sparcv9cpu) || defined(__sparc_v9__) #define _LP64 #endif #endif #ifndef _TMD_PAD_LEN #ifdef _LP64 #define _TMD_PAD_LEN 12 #else #define _TMD_PAD_LEN 24 #endif #endif #ifndef ATIO_CDBLEN #define ATIO_CDBLEN 26 #endif #ifndef QLTM_SENSELEN #define QLTM_SENSELEN 18 #endif typedef struct tmd_cmd { void * cd_private; /* layer private data */ void * cd_hba; /* HBA tag */ void * cd_data; /* 'pointer' to data */ u_int64_t cd_iid; /* initiator ID */ u_int64_t cd_tgt; /* target id */ u_int64_t cd_lun; /* logical unit */ u_int8_t cd_bus; /* bus */ u_int8_t cd_tagtype; /* tag type */ u_int16_t cd_tagval; /* tag value */ u_int8_t cd_cdb[ATIO_CDBLEN]; /* Command */ u_int8_t cd_lflags; /* flags lower level sets */ u_int8_t cd_hflags; /* flags higher level sets */ u_int32_t cd_totlen; /* total data requirement */ u_int32_t cd_resid; /* total data residual */ u_int32_t cd_xfrlen; /* current data requirement */ int32_t cd_error; /* current error */ u_int8_t cd_sense[QLTM_SENSELEN]; u_int16_t cd_scsi_status; /* closing SCSI status */ u_int8_t cd_reserved[_TMD_PAD_LEN]; } tmd_cmd_t; #define CDFL_BUSY 0x01 /* this command is not on a free list */ #define CDFL_NODISC 0x02 /* disconnect not allowed */ #define CDFL_SENTSENSE 0x04 /* last action sent sense data */ #define CDFL_ERROR 0x08 /* last action ended in error */ #define CDFL_PRIVATE_0 0x80 /* private layer flags */ #define CDFH_SNSVALID 0x01 /* sense data valid */ #define CDFH_STSVALID 0x02 /* status valid */ #define CDFH_NODATA 0x00 /* no data transfer expected */ #define CDFH_DATA_IN 0x04 /* target (us) -> initiator (them) */ #define CDFH_DATA_OUT 0x08 /* initiator (them) -> target (us) */ #define CDFH_DATA_MASK 0x0C /* mask to cover data direction */ #define CDFH_PRIVATE_0 0x80 /* private layer flags */ /* * Action codes set by the Qlogic MD target driver for * the external layer to figure out what to do with. */ typedef enum { QOUT_HBA_REG=0, /* the argument is a pointer to a hba_register_t */ QOUT_TMD_START, /* the argument is a pointer to a tmd_cmd_t */ QOUT_TMD_DONE, /* the argument is a pointer to a tmd_cmd_t */ QOUT_TEVENT, /* the argument is a pointer to a tmd_event_t */ QOUT_TMSG, /* the argument is a pointer to a tmd_msg_t */ QOUT_HBA_UNREG /* the argument is a pointer to a hba_register_t */ } tact_e; /* * Action codes set by the external layer for the * MD Qlogic driver to figure out what to do with. */ typedef enum { QIN_HBA_REG=6, /* the argument is a pointer to a hba_register_t */ QIN_TMD_CONT, /* the argument is a pointer to a tmd_cmd_t */ QIN_TMD_FIN, /* the argument is a pointer to a done tmd_cmd_t */ QIN_HBA_UNREG /* the argument is a pointer to a hba_register_t */ } qact_e; /* * A word about the START/CONT/DONE/FIN dance: * * When the HBA is enabled for receiving commands, one may show up * without notice. When that happens, the Qlogic target mode driver * gets a tmd_cmd_t, fills it with the info that just arrived, and * calls the outer layer with a QIN_TMD_START code and pointer to * the tmd_cmd_t. * * The outer layer decodes the command, fetches data, prepares stuff, * whatever, and starts by passing back the pointer with a QIN_TMD_CONT * code which causes the Qlogic target mode driver to generate CTIOs to * satisfy whatever action needs to be taken. When those CTIOs complete, * the Qlogic target driver sends the pointer to the cmd_tmd_t back with * a QOUT_TMD_DONE code. This repeats for as long as necessary. * * The outer layer signals it wants to end the command by settings within * the tmd_cmd_t itself. When the final QIN_TMD_CONT is reported completed, * the outer layer frees the tmd_cmd_t by sending the pointer to it * back with a QIN_TMD_FIN code. * * The graph looks like: * * QOUT_TMD_START -> [ QIN_TMD_CONT -> QOUT_TMD_DONE ] * -> QIN_TMD_FIN. */ /* * Target handler functions. * The MD target handler function (the outer layer calls this) * should be be prototyped like: * * void target_action(qact_e, void *arg) * * The outer layer target handler function (the MD layer calls this) * should be be prototyped like: * * void system_action(tact_e, void *arg) */ /* * This structure is used to register to other software modules the * binding of an HBA identifier, driver name and instance and the * lun width capapbilities of this target driver. It's up to each * platform to figure out how it wants to do this, but a typical * sequence would be for the MD layer to find some external module's * entry point and start by sending a QOUT_HBA_REG with info filled * in, and the external module to call back with a QIN_HBA_REG that * passes back the corresponding information. */ typedef struct { void * r_identity; char r_name[8]; int r_inst; int r_lunwidth; void (*r_action) __P((int, void *)); } hba_register_t;