Re: TOE, etc.

[Steve Wise <swise@opengridcomputing.com>]

On Wed, 2006-06-28 at 15:35 +1000, Herbert Xu wrote:
> On Tue, Jun 27, 2006 at 09:43:23PM -0700, David Miller wrote:
> > 
> > Socket state, and that is one thing I don't see them doing yet.
> 
> I wonder what happens when the Linux TCP stack attempts to open a
> connection to a remote host when that connection is already open
> in the RDMA NIC?  For that matter what happens if a Linux application
> decides to listen on a TCP port already listened on by the RDMA
> NIC?
> 
> The only saving grace is that they're only doing RDMA rather than
> arbitrary TCP.  However, exactly the same infrastructure can be used
> to do arbitrary TCP should they wish to.
>  
> > But we have to realize they've already been given %95 of the
> > interfaces they need to speak IP using our routes and our neighbour
> > entries.
> > 
> > Right?
> 
> Yes, however I think the same argument could be applied to TOE.
> 
> With their RDMA NIC, we'll have TCP/SCTP connections that bypass
> netfilter, tc, IPsec, AF_PACKET/tcpdump and the rest of our stack
> while at the same time it is using the same IP address as us and
> deciding what packets we will or won't see.
> 

Doesn't iSCSI have the same issue?  No netfilter, IPsec, tcpdump, etc...