https://github.com/torvalds/linux
When a LOCALINV WR is flushed, the frmr is marked STALE, then frwr_op_unmap_sync DMA-unmaps the frmr's SGL. These STALE frmrs are then recovered when frwr_op_map hunts for an INVALID frmr to use. All other cases that need frmr recovery leave that SGL DMA-mapped. The FRMR recovery path unconditionally DMA-unmaps the frmr's SGL. To avoid DMA unmapping the SGL twice for flushed LOCAL_INV WRs, alter the recovery logic (rather than the hot frwr_op_unmap_sync path) to distinguish among these cases. This solution also takes care of the case where multiple LOCAL_INV WRs are issued for the same rpcrdma_req, some complete successfully, but some are flushed. Reported-by: Vasco Steinmetz <linux@kyberraum.net> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Tested-by: Vasco Steinmetz <linux@kyberraum.net> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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xprtrdma: Fix DMAR failure in frwr_op_map() after reconnect
Computing file changes ...