xprtrdma: Add ro_unmap_sync method for FMR
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: NChuck Lever <chuck.lever@oracle.com> Tested-by: NDevesh Sharma <devesh.sharma@avagotech.com> Signed-off-by: NAnna Schumaker <Anna.Schumaker@Netapp.com>
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