linux-kernel - Re: Integration of SCST in the mainstream Linux kernel

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Date:	Wed, 06 Feb 2008 09:06:37 -0800
From:	Roland Dreier <rdreier@...co.com>
To:	"Bart Van Assche" <bart.vanassche@...il.com>
Cc:	"Erez Zilber" <erezz@...taire.com>,
	"FUJITA Tomonori" <fujita.tomonori@....ntt.co.jp>,
	James.Bottomley@...senpartnership.com,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	vst@...b.net, linux-scsi@...r.kernel.org,
	scst-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: Integration of SCST in the mainstream Linux kernel

 > Sorry, but I'm afraid you got this wrong. When the iSER transport is
 > used instead of TCP, all data is sent via RDMA, including unsolicited
 > data. If you have look at the iSER implementation in the Linux kernel
 > (source files under drivers/infiniband/ulp/iser), you will see that
 > all data is transferred via RDMA and not via TCP/IP.

I think the confusion here is caused by a slight misuse of the term
"RDMA".  It is true that all data is always transported over an
InfiniBand connection when iSER is used, but not all such transfers
are one-sided RDMA operations; some data can be transferred using
send/receive operations.

 - R.

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