Hi folks, I am attempting to implement SMB Direct (aka SMB over RDMA) for Samba.
For historical, protocol and performance reasons I believe that I need to write a character driver that offloads RDMA stuff to the kernel. Briefly, these reasons are: 1. Samba forks a new smbd when each incoming SMB connection arrives 2. SMB Over RDMA operates by first connecting to the server over TCP, bringing up SMB, determining that the server supports RDMA and then establishing an RDMA connection, bringing up SMB Direct and then transporting SMB PDUs over that. 3. The current Windows client implementation pays no attention to the port supplied to it by the server and always connects on port 4554. I plan on writing a small driver that uses the in-kernel RDMA support to implement SMB Direct and provide shared memory mechanisms for avoiding copying data to and from the kernel for RDMA READs and RDMA WRITEs. After reading the srpt driver, much of what I need to do seems clear. However, I figure that I will eventually need to support situations where there are multiple IB HCAs in a system, and I wondered if there are any abstractions that allow me to do an ib_cm_listen across multiple devices at once? It seems that I have to do an ib_create_cm_id against a device before I can do a listen, but that suggests that I have to: 1. Create a CM ID for each device in the system. This seems easy because of the callbacks that result from ib_register_client 2. Listen on each CM ID 3. When I get a callback on one listen, cancel the others. Is there an easier way? -- Regards, Richard Sharpe (何以解憂？唯有杜康。--曹操) -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
