[7331] in linux-scsi channel archive
Re: Scsi mid level changes in 2.3.19
daemon@ATHENA.MIT.EDU (Matthew Jacob)
Wed Oct 6 12:52:17 1999
Date: Wed, 6 Oct 1999 09:19:26 -0700 (PDT)
From: Matthew Jacob <mjacob@feral.com>
Reply-To: mjacob@feral.com
To: Douglas Gilbert <dgilbert@interlog.com>
cc: linux-scsi@vger.rutgers.edu, bobf@advansys.com, eric@andante.org
In-Reply-To: <37FB4C0C.6E76905B@interlog.com>
Message-ID: <Pine.BSF.4.10.9910060918020.58348-100000@beppo.feral.com>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
> As foreshadowed in a previous posting to this group, some
> changes have been made to the SCSI mid level command structure
> [struct scsi_cmnd] in 2.3.19
> - the sense_buffer array has been increased from 16 to 64 bytes
> - a new int member called "resid" has been added.
>
> The "resid" member is for the residual DMA count from data
> transfers. It is initialized to 0 and is set currently by no
> adapter drivers [hint]. It is defined (as per CAM) as the
> requested data transfer length less the number of bytes
> actually transferred. In practice, it should be used to indicate
> underrun (which will yield a positive number). [Hopefully
Right on. From my qlogic FC/SCSI driver:
isplinux_cdone(Scsi_Cmnd *Cmnd)
{
struct ispsoftc *isp = (struct ispsoftc *) (Cmnd->host->hostdata);
/*
* Internal bookkeeping
*/
Cmnd->SCp.phase = 1;
/*
*
*/
Cmnd->result &= ~0xff;
Cmnd->result |= Cmnd->SCp.Status;
if (host_byte(Cmnd->result) == DID_OK) {
/* Never have can_queue go to zero. */
int cq = ISP_QAVAIL(isp->isp_reqidx, isp->isp_reqodx,
min(MAXISPREQUEST, isp->isp_maxcmds));
Cmnd->host->can_queue = (cq != 0)? cq : 1;
if (IS_FC(isp))
Cmnd->host->sg_tablesize = SGSZ_2X00(Cmnd->host->can_queue);
else
Cmnd->host->sg_tablesize = SGSZ_1XX0(Cmnd->host->can_queue);
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,1,75)
/* host_busy is an unsigned char for 2.0.X */
cq = min(cq, 255);
#endif
}
/*
* If we had a way handling residuals, this is where we'd do it
*/
/*
* Queue command on completion queue.
*/
if (isp->isp_osinfo.dqnext == NULL) {
isp->isp_osinfo.dqnext = isp->isp_osinfo.dqtail = Cmnd;
} else {
isp->isp_osinfo.dqtail->host_scribble = (unsigned char *) Cmnd;
}
Cmnd->host_scribble = NULL;
}
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