[ewg] is RoCEE for Infiniband HCA or Ethernet NIC?

[Her, Il]

Thank you.
Now I understand whole thing

Thanks & Regards

Her, Il
Technology Consulting
Technology Services Korea

TEL: +82-2-2199-4475
Mobile: +82-10-4765-5597
il.her at hp.com

From: Paul Grun [mailto:pgrun at systemfabricworks.com]
Sent: Thursday, March 17, 2011 10:10 PM
To: Her, Il; ewg at lists.openfabrics.org
Subject: RE: [ewg] is RoCEE for Infiniband HCA or Ethernet NIC?

Sounds like a slight bit of confusion...

OFED verbs runs over a channel adapter.  You have three choices of types of channel adapters to use -

1.    An InfiniBand HCA

2.    An iWARP RNIC,

3.    RoCE

You asked about the relationship between IB and RoCE, so let's leave iWARP aside for now.
IB and RoCE are virtually equivalent, with one exception:  an IB HCA runs over an InfiniBand switched fabric, whereas RoCE runs over an Ethernet layer 2 switched fabric.  If you have written your application to run over the verbs API, you can use either RoCE or InfiniBand as the underlying transport.  In other words, RoCE runs on an Ethernet NIC and IB runs on an InfiniBand HCA.

Naturally, you cannot use InfiniBand on one end (e.g. client), and RoCE on the other (e.g. server).  It's one or the other.

By 'RDMA program', I think what you mean is an application written directly to the Verbs API.  It is possible to re-write a sockets program to run directly on RDMA verbs, or you can take advantage of some of the OFED ULPs to avoid some of that re-write.
-Paul

From: ewg-bounces at lists.openfabrics.org [mailto:ewg-bounces at lists.openfabrics.org] On Behalf Of Her, Il
Sent: Wednesday, March 16, 2011 9:43 AM
To: ewg at lists.openfabrics.org
Subject: [ewg] is RoCEE for Infiniband HCA or Ethernet NIC?

Hello, ewg.

I heard that Socket program and RDMA program can communicate with each other by using RoCEE
Then does it work within Infiniband Network or Ethernet Network or both?
I'm confused whether RoCEE is for Infiniband HCA or Ethernet NIC.

thank you.

Her, Il
Technology Consulting
Technology Service Korea

TEL  : +82-2-2199-4475
Mobile : +82-10-4765-5597
il.her at hp.com<mailto:choong-keun.yoo at hp.com>

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