Steve Wise wrote: > Depends on the 4-tuple. The demux done in the TOE hw uses src addr/port and > dst addr/port.
Hi Steve, Trying to better understand the problem and possible solutions, I looked on the Chelsio iscsi offload driver (drivers/scsi/cxgb3i/* & Documentation/scsi/cxgb3i.txt) - which basically should suffer from the same issue - how to distinguish between a iscsi/os-tcp connection to iscsi/hw-tcp (toe) connection (or to iperf connection, etc as we discussed). I saw it manages the source port from its own data-structure (similar to the rdma-cm) but it doesn't open of a socket / nor bind the port - so I assume that a host opens two iscsi/tcp connections to a target on the same src ip/port - a party starts... At this point I came a cross the "cxgb3: manage private iSCSI IP address" patch whose change log states that its mostly ARP related- is the ARP resolution for iSCSI/DDP/TOE different from iWARP/DDP/TOE? does the below patch/approach eliminates the port space problem for iscsi/ddp? Or. commit a109a5b916bc180e14fad0d1e9c37a08c85652c0 Author: Karen Xie <[email protected]> Date: Thu Dec 18 22:56:20 2008 -0800 cxgb3: manage private iSCSI IP address The accelerated iSCSI traffic could use a private IP address unknown to the OS: - The IP address is required in both drivers to manage ARP requests and connection set up. - Added an control call to retrieve the ip address. - Reply to ARP requests dedicated to the private IP address. Signed-off-by: Divy Le Ray <[email protected]> Signed-off-by: Karen Xie <[email protected]> Signed-off-by: David S. Miller <[email protected]> _______________________________________________ general mailing list [email protected] http://lists.openfabrics.org/cgi-bin/mailman/listinfo/general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
