[Bug 259152] [iscsi] ExpDataSN mismatch in SCSI Response (unable to connect or authenticate to OCI oracle iscsi block devices)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259152

--- Comment #8 from John Baldwin <jhb@FreeBSD.org> ---
Created attachment 228734
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=228734&action=edit
permit_expdatasn_0.patch

Not tested, but I did notice that we should require an ExpDataSN of 0 if the
response is not command completed.

Looking at the latest trace, it does seem that the SCSI response does include
an ExpDataSN of 0, and I've added an exception that tries to exempt this check
for errors.  It's not conformant, but Linux also doesn't check for this that I
can see (linux/drivers/scsi/libiscsi.c:iscsi_scsi_cmd_rsp()).

This though will just get you back to comment #4 I think and we will still need
a pcap with -s 0 of the result to look at for the next issue.

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