Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Clarify cd_resid tag.

This commit is contained in:
mjacob 2000-02-19 01:50:03 +00:00
parent 8405ee3752
commit 77dec43b22
1 changed files with 6 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
sys/dev/ic/isp_tpublic.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: isp_tpublic.h,v 1.1 2000/02/12 02:23:13 mjacob Exp $ */
/* $NetBSD: isp_tpublic.h,v 1.2 2000/02/19 01:50:03 mjacob Exp $ */
/*
* Qlogic ISP Host Adapter Public Target Interface Structures && Routines
*---------------------------------------
@ -129,13 +129,11 @@ typedef struct {
* 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_resid should be the total residual of data not transferred.
* The outer layers need to set this at the begining of command processing
* to equal cd_totlen. As data is successfully moved, this value is decreased.
* At the end of a command, any nonzero 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