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| author | Yuval Shaia <yuval.shaia@oracle.com> | 2018-12-21 16:40:15 +0200 |
|---|---|---|
| committer | Marcel Apfelbaum <marcel.apfelbaum@gmail.com> | 2018-12-22 11:09:56 +0200 |
| commit | a5d2f6f8773a8ce7534e79b067f135d55c6274cb (patch) | |
| tree | 7496bb9190666f30394491858f8c2edb0e243c23 /Makefile.objs | |
| parent | dee2e53c86de37dea4f36936eab5a6aef340b8f8 (diff) | |
| download | qemu-a5d2f6f8773a8ce7534e79b067f135d55c6274cb.zip qemu-a5d2f6f8773a8ce7534e79b067f135d55c6274cb.tar.gz qemu-a5d2f6f8773a8ce7534e79b067f135d55c6274cb.tar.bz2 | |
contrib/rdmacm-mux: Add implementation of RDMA User MAD multiplexer
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:
Reviewed-by: Shamir Rabinovitch <shamir.rabinovitch@oracle.com>
----------------
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.
Signed-off-by: Yuval Shaia <yuval.shaia@oracle.com>
Reviewed-by: Shamir Rabinovitch <shamir.rabinovitch@oracle.com>
Signed-off-by: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
Diffstat (limited to 'Makefile.objs')
| -rw-r--r-- | Makefile.objs | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/Makefile.objs b/Makefile.objs index 56af034..319f14d 100644 --- a/Makefile.objs +++ b/Makefile.objs @@ -133,6 +133,7 @@ vhost-user-scsi.o-cflags := $(LIBISCSI_CFLAGS) vhost-user-scsi.o-libs := $(LIBISCSI_LIBS) vhost-user-scsi-obj-y = contrib/vhost-user-scsi/ vhost-user-blk-obj-y = contrib/vhost-user-blk/ +rdmacm-mux-obj-y = contrib/rdmacm-mux/ ###################################################################### trace-events-subdirs = |