[Bug 227313] net/isboot-kmod works with net/istgt but not with ctld(8)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227313

            Bug ID: 227313
           Summary: net/isboot-kmod works with net/istgt but not with
                    ctld(8)
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: maurizio1018 at gmail.com
                CC: john at jnielsen.net
                CC: john at jnielsen.net

I am not shure this bug is related to net/isboot-kmod or ctld(8).

I am successfully running a diskless TrueOS, a FreeBSD 12-CURRENT based OS,
desktop with the net/istgt port installed in a FreeBSD 11-RELEASE server. I am
using this setup without any error, but it is a bit slow.
I want to test ctld on my server, but when the diskless PC loads the isboot
driver it loops with a lot of these error messages:
“soreceive BHS is not complete, remaining byte(s)=48
do login failed
soreceive BHS is not complete, remaining byte(s)=48
do login failed”
The source code, of the isboot-kmod driver, that prints the error message is:

/* BHS */
    flags = MSG_WAITALL;
    uio.uio_resid = ISCSI_BHS_LEN;
    error = soreceive(sess->so, NULL, &uio, &mp, NULL, &flags);
    if (error) {
        ISBOOT_ERROR("soreceive BHS error %d\n", error);
        return (error);
    }
    if (uio.uio_resid != 0) {
        ISBOOT_ERROR("soreceive BHS is not complete, remaining "
            "byte(s)=%d\n", (int) uio.uio_resid);
        return (EIO);
    }

source file: iscsi.c, proc: isboot_recv_pdu()
The ISCSI_BHS_LEN constant is 48 and seems that no bytes are read.

On the server, in /var/log/messages, I can read a lots of messages like:
“Mar 28 16:32:39 clover-nas2 ctld[59634]: 192.168.0.164: protocol error:
received invalid opcode 0x83
Mar 28 16:32:39 clover-nas2 ctld[40784]: child process 59634 terminated with
exit status 1
Mar 28 16:32:40 clover-nas2 ctld[59637]: 192.168.0.164: protocol error:
received invalid opcode 0x83
Mar 28 16:32:40 clover-nas2 ctld[40784]: child process 59637 terminated with
exit status 1”

The isboot driver send an unrecognized opcode 0x83 to the cltd daemon ..., but
I cannot continue, I need some help from the community. :-)

Note: the patch for compiling and running isboot-kmod in FreeBSD 12 is at: bug
#226982

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