Re: IPS: Adaptec IPR Notice

[Andre Hedrick <andre@linux-ide.org>]

Basically it sounds like a simple mem-pool shared between the net-stack
and storage stack.  Applying ZERO-copy of d-gram from the pre-allocated
pool and indexing against the offset value of a given PDU, it is simple
logic to build the scatter-gather list according to the following.

Command w/ or w/o Immediate data describes the initial reference point. 

Dump Data payload in ZeroCopy fashion to a pool of IOVECS.
Carry the sum of data collected in inside your stuct index for determining
all data is present.  BLAH BLAH ... Once all PDU's are collected, build
the SG Table for the HBA based on any given logical sorting routine.

Since the IOVECS were pre allocated and of page size, the array of for the
entry points and their associated offsets can be acted upon to
create/produce the appearance of DataPDUInOrder=No.

Now pass the simple pointer of the physical memory address containing the
unclever SGT and push it to the HBA.

Been doing this for quite a while and is the basics of binding a shared
pool of mapped memory for a generic zero-copy between the network and
spindle.  Not much more than sendmail on crack with a spindle added for a
sprinkle of flavor.

If this is your patent, well not much there.
If it is not your patent, here is a free way to bypass it.
If I have to patent the method and make it free to help keep the IETF
clean of patents great!  This is not NCITS, and ...

"reasonable, non-discriminatory terms" recall 1394 Firewire from the T
commitees.

In keeping with the spirit of IETF, if there are any other members who
would like to derive a better mouse-trap in a joint effort to file for a
patent and release it royality free for the good if iSCSI and
interoperability, ping me offline.

Regards,

Andre Hedrick
LAD Storage Consulting Group

PS, I have not looked at your patent nor will I.

On Thu, 17 Apr 2003, Sperry, Todd wrote:

> 
> Adaptec has made a patent application that may relate to the
> work underway in the IPS working group, specifically to the
> work derived from draft-ietf-ips-iscsi-20.txt.  This patent application 
> describes a method and process for calculating a CRC on data 
> received out of order without having to store and assemble the data.
> 
> If any patents are issued to Adaptec with claims that are necessary 
> for practicing this standard, any party will be able to obtain the right 
> to implement, use and distribute the technology or works when implementing,
> using or distributing technology based upon the specific specification
> under openly specified, reasonable, non-discriminatory terms.
> 
> Requests may be sent to:
> 
> 	Adaptec Legal Department
> 	691 South Milpitas Boulevard
> 	Milpitas, Ca. 95035
> 
> 	Phone:  (408) 957-1718
> 	Email:   legal@adaptec.com
>