xprtrdma: Introduce helpers for allocating MWs

We eventually want to handle allocating MWs one at a time, as
needed, instead of grabbing 64 and throwing them at each RPC in the
pipeline.

Add a helper for grabbing an MW off rb_mws, and a helper for
returning an MW to rb_mws. These will be used in a subsequent patch.

Signed-off-by: Chuck Lever <[email protected]>
Reviewed-by: Steve Wise <[email protected]>
Reviewed-by: Sagi Grimberg <[email protected]>
Tested-By: Devesh Sharma <[email protected]>
Reviewed-by: Doug Ledford <[email protected]>
Signed-off-by: Anna Schumaker <[email protected]>

0 files changed, 0 insertions, 0 deletions