On Mon, Jul 16, 2018 at 08:07:32PM +0000, Bart Van Assche wrote: > On Mon, 2018-07-16 at 23:03 +0300, Yuval Shaia wrote: > > RDMA MAD kernel module (ibcm) disallow more than one MAD-agent for a > > given MAD class. > > This does not go hand-by-hand with qemu pvrdma device's requirements > > where each VM is MAD agent. > > Fix it by adding implementation of RDMA MAD multiplexer service which on > > one hand register as a sole MAD agent with the kernel module and on the > > other hand gives service to more than one VM. > > > > Design Overview: > > ---------------- > > A server process is registered to UMAD framework (for this to work the > > rdma_cm kernel module needs to be unloaded) and creates a unix socket to > > listen to incoming request from clients. > > A client process (such as QEMU) connects to this unix socket and > > registers with its own GID. > > > > TX: > > --- > > When client needs to send rdma_cm MAD message it construct it the same > > way as without this multiplexer, i.e. creates a umad packet but this > > time it writes its content to the socket instead of calling umad_send(). > > The server, upon receiving such a message fetch local_comm_id from it so > > a context for this session can be maintain and relay the message to UMAD > > layer by calling umad_send(). > > > > RX: > > --- > > The server creates a worker thread to process incoming rdma_cm MAD > > messages. When an incoming message arrived (umad_recv()) the server, > > depending on the message type (attr_id) looks for target client by > > either searching in gid->fd table or in local_comm_id->fd table. With > > the extracted fd the server relays to incoming message to the client. > > Has this been tested with the SRP protocol? I'm wondering whether this makes > it possible to run the ib_srpt driver and/or the srp_daemon software in a > KVM virtual machine. No, i just tested it with rdma_client/rdma_server and udaddy and they creates rdma_cm MADs only. Current implementation is specialized *only* in rdma_cm messages and since i don't know yet srp i cannot tell how complex it to add support. > > Thanks, > > Bart. > > > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-rdma" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
