Fwd: Corrected diagram and description for SMB-Direct (RDMA) support in Samba
obnox at samba.org
Wed May 21 12:48:15 MDT 2014
On 2014-05-21 at 14:23 -0400, Ira Cooper wrote:
> On Wed, May 21, 2014 at 2:11 PM, Stefan (metze) Metzmacher
> <metze at samba.org>wrote:
> > >> The session bind using the sessionID will still happen.
> > >> The fd-passing would just have happened before.
> > >> The fd-passing is something we plan to do under the hood
> > >> and is not necessarily tied to the session-bind.
> > >>
> > >
> > > What about VFS modules that don't have file descriptors?
> > FD-passing will be only used for the tcp connection
> > not for open file handles.
> > So VFS modules will just work fine.
> So what actually creates the RDMA queue, and does the processing in this
> Can someone show me the event trace for read/write?
I am not sure that this is what you are asking:
The chain of events for bringing up a smb-direct-daemon
and establishing a proxy channel and mmap area between
smbd-process for a client and this (one) smbd-direct-daemon
is skeched in the earlier mails in this thread and the
thread "SMB3 and RDMA".
then the one smb-direct-daemon does all the RDMA connections
and speaks smb-direct. The rdma read and write calls are then
using addresses from the mmap-ed area from the corresponding
smbd child process.
I need to write all this up in greater detail in the wiki,
but please read up on these two recent threads.
Cheers - Michael
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