336 lines
14 KiB
C
336 lines
14 KiB
C
/* $FreeBSD$ */
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/*
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* Qlogic ISP Host Adapter Public Target Interface Structures && Routines
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*---------------------------------------
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* Copyright (c) 2000 by Matthew Jacob
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification, immediately at the beginning of the file.
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* 2. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Matthew Jacob
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* Feral Software
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* mjacob@feral.com
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*/
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/*
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* Required software target mode message and event handling structures.
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*
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* The message and event structures are used by the MI layer
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* to propagate messages and events upstream.
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*/
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#ifndef IN_MSGLEN
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#define IN_MSGLEN 8
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#endif
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typedef struct {
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void * nt_hba; /* HBA tag */
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u_int64_t nt_iid; /* inititator id */
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u_int64_t nt_tgt; /* target id */
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u_int64_t nt_lun; /* logical unit */
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u_int8_t nt_bus; /* bus */
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u_int8_t nt_tagtype; /* tag type */
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u_int16_t nt_tagval; /* tag value */
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u_int8_t nt_msg[IN_MSGLEN]; /* message content */
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} tmd_msg_t;
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typedef struct {
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void * ev_hba; /* HBA tag */
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u_int16_t ev_bus; /* bus */
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u_int16_t ev_event; /* type of async event */
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} tmd_event_t;
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/*
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* Suggested Software Target Mode Command Handling structure.
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*
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* A note about terminology:
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*
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* MD stands for "Machine Dependent".
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*
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* This driver is structured in three layers: Outer MD, core, and inner MD.
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* The latter also is bus dependent (i.e., is cognizant of PCI bus issues
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* as well as platform issues).
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*
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*
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* "Outer Layer" means "Other Module"
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*
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* Some additional module that actually implements SCSI target command
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* policy is the recipient of incoming commands and the source of the
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* disposition for them.
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*
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* The command structure below is one suggested possible MD command structure,
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* but since the handling of thbis is entirely in the MD layer, there is
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* no explicit or implicit requirement that it be used.
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*
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* The cd_private tag should be used by the MD layer to keep a free list
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* of these structures. Code outside of this driver can then use this
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* to identify it's own unit structures. That is, when not on the MD
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* layer's freelist, the MD layer should shove into it the identifier
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* that the outer layer has for it- passed in on an initial QIN_HBA_REG
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* call (see below).
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*
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* The cd_hba tag is a tag that uniquely identifies the HBA this target
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* mode command is coming from. The outer layer has to pass this back
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* unchanged to avoid chaos.
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*
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* The cd_iid, cd_tgt, cd_lun and cd_bus tags are used to identify the
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* id of the initiator who sent us a command, the target claim to be, the
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* lun on the target we claim to be, and the bus instance (for multiple
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* bus host adapters) that this applies to (consider it an extra Port
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* parameter). The iid, tgt and lun values are deliberately chosen to be
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* fat so that, for example, World Wide Names can be used instead of
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* the units that the Qlogic firmware uses (in the case where the MD
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* layer maintains a port database, for example).
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*
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* The cd_tagtype field specifies what kind of command tag has been
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* sent with the command. The cd_tagval is the tag's value (low 16
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* bits). It also contains (in the upper 16 bits) any command handle.
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*
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*
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* N.B.: when the MD layer sends this command to outside software
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* the outside software likely *MUST* return the same cd_tagval that
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* was in place because this value is likely what the Qlogic f/w uses
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* to identify a command.
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*
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* The cd_cdb contains storage for the passed in command descriptor block.
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* This is the maximum size we can get out of the Qlogic f/w. There's no
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* passed in length because whoever decodes the command to act upon it
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* will know what the appropriate length is.
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*
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* The tag cd_lflags are the flags set by the MD driver when it gets
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* command incoming or when it needs to inform any outside entities
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* that the last requested action failed.
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*
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* The tag cd_hflags should be set by any outside software to indicate
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* the validity of sense and status fields (defined below) and to indicate
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* the direction data is expected to move. It is an error to have both
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* CDFH_DATA_IN and CDFH_DATA_OUT set.
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*
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* If the CDFH_STSVALID flag is set, the command should be completed (after
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* sending any data and/or status). If CDFH_SNSVALID is set and the MD layer
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* can also handle sending the associated sense data (either back with an
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* FCP RESPONSE IU for Fibre Channel or otherwise automatically handling a
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* REQUEST SENSE from the initator for this target/lun), the MD layer will
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* set the CDFL_SENTSENSE flag on successful transmission of the sense data.
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* It is an error for the CDFH_SNSVALID bit to be set and CDFH_STSVALID not
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* to be set. It is an error for the CDFH_SNSVALID be set and the associated
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* SCSI status (cd_scsi_status) not be set to CHECK CONDITON.
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*
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* The tag cd_data points to a data segment to either be filled or
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* read from depending on the direction of data movement. The tag
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* is undefined if no data direction is set. The MD layer and outer
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* layers must agree on the meaning of cd_data.
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*
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* The tag cd_totlen is the total data amount expected to be moved
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* over the life of the command. It *may* be set by the MD layer, possibly
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* from the datalen field of an FCP CMND IU unit. If it shows up in the outer
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* layers set to zero and the CDB indicates data should be moved, the outer
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* layer should set it to the amount expected to be moved.
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*
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* The tag cd_resid should be the total residual of data not transferred.
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* The outer layers need to set this at the begining of command processing
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* to equal cd_totlen. As data is successfully moved, this value is decreased.
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* At the end of a command, any nonzero residual indicates the number of bytes
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* requested but not moved. XXXXXXXXXXXXXXXXXXXXXXX TOO VAGUE!!!
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*
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* The tag cd_xfrlen is the length of the currently active data transfer.
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* This allows several interations between any outside software and the
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* MD layer to move data.
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*
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* The reason that total length and total residual have to be tracked
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* is that fibre channel FCP DATA IU units have to have a relative
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* offset field.
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*
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* N.B.: there is no necessary 1-to-1 correspondence between any one
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* data transfer segment and the number of CTIOs that will be generated
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* satisfy the current data transfer segment. It's not also possible to
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* predict how big a transfer can be before it will be 'too big'. Be
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* reasonable- a 64KB transfer is 'reasonable'. A 1MB transfer may not
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* be. A 32MB transfer is unreasonable. The problem here has to do with
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* how CTIOs can be used to map passed data pointers. In systems which
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* have page based scatter-gather requirements, each PAGESIZEd chunk will
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* consume one data segment descriptor- you get 3 or 4 of them per CTIO.
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* The size of the REQUEST QUEUE you drop a CTIO onto is finite (typically
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* it's 256, but on some systems it's even smaller, and note you have to
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* sure this queue with the initiator side of this driver).
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*
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* The tags cd_sense and cd_scsi_status are pretty obvious.
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*
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* The tag cd_error is to communicate between the MD layer and outer software
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* the current error conditions.
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*
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* The tag cd_reserved pads out the structure to 128 bytes. The first
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* half of the pad area is reserved to the MD layer, and the second half
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* may be used by outer layers, for scratch purposes.
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*/
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#ifndef _LP64
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#if defined(__alpha__) || defined(__sparcv9cpu) || defined(__sparc_v9__) ||\
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defined(__ia64__)
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#define _LP64
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#endif
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#endif
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#ifndef _TMD_PAD_LEN
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#ifdef _LP64
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#define _TMD_PAD_LEN 12
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#else
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#define _TMD_PAD_LEN 24
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#endif
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#endif
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#ifndef ATIO_CDBLEN
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#define ATIO_CDBLEN 26
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#endif
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#ifndef QLTM_SENSELEN
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#define QLTM_SENSELEN 18
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#endif
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typedef struct tmd_cmd {
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void * cd_private; /* layer private data */
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void * cd_hba; /* HBA tag */
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void * cd_data; /* 'pointer' to data */
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u_int64_t cd_iid; /* initiator ID */
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u_int64_t cd_tgt; /* target id */
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u_int64_t cd_lun; /* logical unit */
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u_int8_t cd_bus; /* bus */
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u_int8_t cd_tagtype; /* tag type */
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u_int32_t cd_tagval; /* tag value */
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u_int8_t cd_cdb[ATIO_CDBLEN]; /* Command */
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u_int8_t cd_lflags; /* flags lower level sets */
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u_int8_t cd_hflags; /* flags higher level sets */
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u_int32_t cd_totlen; /* total data requirement */
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u_int32_t cd_resid; /* total data residual */
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u_int32_t cd_xfrlen; /* current data requirement */
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int32_t cd_error; /* current error */
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u_int8_t cd_sense[QLTM_SENSELEN];
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u_int16_t cd_scsi_status; /* closing SCSI status */
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u_int8_t cd_reserved[_TMD_PAD_LEN];
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} tmd_cmd_t;
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#define CDFL_SNSVALID 0x01 /* sense data (from f/w) valid */
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#define CDFL_NODISC 0x02 /* disconnects disabled */
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#define CDFL_SENTSENSE 0x04 /* last action sent sense data */
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#define CDFL_SENTSTATUS 0x08 /* last action sent status */
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#define CDFL_ERROR 0x10 /* last action ended in error */
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#define CDFL_BUSY 0x40 /* this command is not on a free list */
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#define CDFL_PRIVATE_0 0x80 /* private layer flags */
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#define CDFH_SNSVALID 0x01 /* sense data valid */
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#define CDFH_STSVALID 0x02 /* status valid */
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#define CDFH_NODATA 0x00 /* no data transfer expected */
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#define CDFH_DATA_IN 0x04 /* target (us) -> initiator (them) */
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#define CDFH_DATA_OUT 0x08 /* initiator (them) -> target (us) */
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#define CDFH_DATA_MASK 0x0C /* mask to cover data direction */
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#define CDFH_PRIVATE_0 0x80 /* private layer flags */
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/*
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* Action codes set by the Qlogic MD target driver for
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* the external layer to figure out what to do with.
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*/
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typedef enum {
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QOUT_HBA_REG=0, /* the argument is a pointer to a hba_register_t */
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QOUT_TMD_START, /* the argument is a pointer to a tmd_cmd_t */
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QOUT_TMD_DONE, /* the argument is a pointer to a tmd_cmd_t */
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QOUT_TEVENT, /* the argument is a pointer to a tmd_event_t */
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QOUT_TMSG, /* the argument is a pointer to a tmd_msg_t */
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QOUT_HBA_UNREG /* the argument is a pointer to a hba_register_t */
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} tact_e;
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/*
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* Action codes set by the external layer for the
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* MD Qlogic driver to figure out what to do with.
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*/
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typedef enum {
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QIN_HBA_REG=6, /* the argument is a pointer to a hba_register_t */
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QIN_ENABLE, /* the argument is a pointer to a tmd_cmd_t */
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QIN_DISABLE, /* the argument is a pointer to a tmd_cmd_t */
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QIN_TMD_CONT, /* the argument is a pointer to a tmd_cmd_t */
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QIN_TMD_FIN, /* the argument is a pointer to a done tmd_cmd_t */
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QIN_HBA_UNREG /* the argument is a pointer to a hba_register_t */
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} qact_e;
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/*
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* A word about the START/CONT/DONE/FIN dance:
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*
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* When the HBA is enabled for receiving commands, one may show up
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* without notice. When that happens, the Qlogic target mode driver
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* gets a tmd_cmd_t, fills it with the info that just arrived, and
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* calls the outer layer with a QOUT_TMD_START code and pointer to
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* the tmd_cmd_t.
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*
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* The outer layer decodes the command, fetches data, prepares stuff,
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* whatever, and starts by passing back the pointer with a QIN_TMD_CONT
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* code which causes the Qlogic target mode driver to generate CTIOs to
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* satisfy whatever action needs to be taken. When those CTIOs complete,
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* the Qlogic target driver sends the pointer to the cmd_tmd_t back with
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* a QOUT_TMD_DONE code. This repeats for as long as necessary.
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*
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* The outer layer signals it wants to end the command by settings within
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* the tmd_cmd_t itself. When the final QIN_TMD_CONT is reported completed,
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* the outer layer frees the tmd_cmd_t by sending the pointer to it
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* back with a QIN_TMD_FIN code.
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*
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* The graph looks like:
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*
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* QOUT_TMD_START -> [ QIN_TMD_CONT -> QOUT_TMD_DONE ] * -> QIN_TMD_FIN.
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*
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*/
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/*
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* A word about ENABLE/DISABLE: the argument is a pointer to a tmd_cmd_t
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* with cd_hba, cd_bus, cd_tgt and cd_lun filled out. If an error occurs
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* in either enabling or disabling the described lun, cd_lflags is set
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* with CDFL_ERROR.
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*
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* Logical unit zero must be the first enabled and the last disabled.
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*/
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/*
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* Target handler functions.
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* The MD target handler function (the outer layer calls this)
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* should be be prototyped like:
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*
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* void target_action(qact_e, void *arg)
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*
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* The outer layer target handler function (the MD layer calls this)
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* should be be prototyped like:
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*
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* void system_action(tact_e, void *arg)
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*/
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/*
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* This structure is used to register to other software modules the
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* binding of an HBA identifier, driver name and instance and the
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* lun width capapbilities of this target driver. It's up to each
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* platform to figure out how it wants to do this, but a typical
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* sequence would be for the MD layer to find some external module's
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* entry point and start by sending a QOUT_HBA_REG with info filled
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* in, and the external module to call back with a QIN_HBA_REG that
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* passes back the corresponding information.
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*/
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typedef struct {
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void * r_identity;
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char r_name[8];
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int r_inst;
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int r_lunwidth;
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int r_buswidth;
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void (*r_action)(int, void *);
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} hba_register_t;
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