CVS commit: src/sys/dev/iscsi

["Michael van Elst" <mlelstv%netbsd.org@localhost>]

Module Name:    src
Committed By:   mlelstv
Date:           Wed Jun 15 04:30:30 UTC 2016

Modified Files:
        src/sys/dev/iscsi: iscsi.h iscsi_globals.h iscsi_ioctl.c iscsi_main.c
            iscsi_rcv.c iscsi_send.c iscsi_utils.c

Log Message:
Remove throttling code, instead signal scsipi layer to reduce the openings
and retry the command. Start with a small openings number and let scsipi
request to grow it up to the current send window.

Adjust ccb and pdu counts to avoid ressource shortages. These are still
very ad-hoc numbers, but seem to be sufficient for a Gigabit link.

Use separate condvar for PDU pool and add counter to help debugging.

Revert setting PDU disposition to UNUSED before freeing. free_pdu
uses this as a flag to detect already returned PDUs.

Add reference counter for open commands to defer unmapping a session
that would lead to crashes in scsipi.

Move session cleanup to cleanup thread.

Use get_sernum to retrieve current serial number where possible and
make it check for immediate commands itself.

Adjust debug output.


To generate a diff of this commit:
cvs rdiff -u -r1.3 -r1.4 src/sys/dev/iscsi/iscsi.h
cvs rdiff -u -r1.20 -r1.21 src/sys/dev/iscsi/iscsi_globals.h \
    src/sys/dev/iscsi/iscsi_rcv.c src/sys/dev/iscsi/iscsi_utils.c
cvs rdiff -u -r1.21 -r1.22 src/sys/dev/iscsi/iscsi_ioctl.c
cvs rdiff -u -r1.22 -r1.23 src/sys/dev/iscsi/iscsi_main.c
cvs rdiff -u -r1.30 -r1.31 src/sys/dev/iscsi/iscsi_send.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.