xprtrdma: Acquire FMRs in rpcrdma_fmr_register_external()

Acquiring 64 FMRs in rpcrdma_buffer_get() while holding the buffer
pool lock is expensive, and unnecessary because FMR mode can
transfer up to a 1MB payload using just a single ib_fmr.

Instead, acquire ib_fmrs one-at-a-time as chunks are registered, and
return them to rb_mws immediately during deregistration.

Signed-off-by: Chuck Lever <[email protected]>
Reviewed-by: Steve Wise <[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