xprtrdma: Add ro_unmap_sync method for FMR

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FMR's ro_unmap method is already synchronous because ib_unmap_fmr()
is a synchronous verb. However, some improvements can be made here.

1. Gather all the MRs for the RPC request onto a list, and invoke
   ib_unmap_fmr() once with that list. This reduces the number of
   doorbells when there is more than one MR to invalidate

2. Perform the DMA unmap _after_ the MRs are unmapped, not before.
   This is critical after invalidating a Write chunk.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Devesh Sharma <devesh.sharma@avagotech.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

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Chuck Lever 2015-12-16 17:22:55 -05:00 • committed by Anna Schumaker

parent c9918ff56d

commit 7c7a5390dc

1 changed files with 64 additions and 0 deletions

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net/sunrpc/xprtrdma/fmr_ops.c

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