[dat-discussions] RE: [openib-general] Re: iWARP emulationprotocol

[Kanevsky, Arkady]

Sean,

if look at the proposal it shows 2 ways to address this.

1. Have 2 protocols.
One just send SRC IP address and port, and provdie 64 bytes to ULP.
Another one send both SRC and DEST info and leaves 48(+-) bytes of
private data for ULP.

2. Have 2 protocols.
Split IPv4 and IPv6 methods.
For IPv4 send SRC and DST addressing and 64 bytes of ULP private data.
For IPv6 we have several options.
a. GID=IPv6 address
b. use second CM frame to have carry ULP private data.
c. others

But having multiple versions supported is not pleasant.
It looses a simple backwards compatibility of current
protocol which just formats CM private data field.

Arkady Kanevsky                       email: arkady at netapp.com
Network Appliance                     phone: 781-768-5395
375 Totten Pond Rd.                  Fax: 781-895-1195
Waltham, MA 02451-2010          central phone: 781-768-5300
 


> -----Original Message-----
> From: Sean Hefty [mailto:mshefty at ichips.intel.com] 
> Sent: Wednesday, October 19, 2005 1:00 PM
> To: Richard Frank
> Cc: swg at infinibandta.org; dat-discussions at yahoogroups.com; 
> openib-general at openib.org; Davis, Arlin R
> Subject: Re: [dat-discussions] RE: [openib-general] Re: iWARP 
> emulationprotocol
> 
> 
> Richard Frank wrote:
> > Oracle currently depends on 64 bytes of private data for connect and
> > accept.
> 
> Is any of that data used to exchange address information?
> 
> It's impossible to provide both the source and destination 
> address in the CM REQ 
> private data and still give the user 64 bytes.  The source 
> address is needed for 
> the reverse GID->IP lookup.  Can we make due without the 
> destination address?
> 
> - Sean
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