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svcrdma: Clean-up svc_rdma_unmap_dma 

There's no longer a need to compare each SGE's lkey with the PD's
local_dma_lkey. Now that FRWR is gone, all DMA mappings are for
pages that were registered with this key.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Chuck Lever 2017-06-23 17:19:05 -04:00 committed by J. Bruce Fields
parent 463e63d701
commit 0d956e694a
1 changed files with 5 additions and 14 deletions
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19
net/sunrpc/xprtrdma/svc_rdma_transport.c
View File

@ -225,22 +225,13 @@ void svc_rdma_unmap_dma(struct svc_rdma_op_ctxt *ctxt)
{ {
struct svcxprt_rdma *xprt = ctxt->xprt; struct svcxprt_rdma *xprt = ctxt->xprt;
struct ib_device *device = xprt->sc_cm_id->device; struct ib_device *device = xprt->sc_cm_id->device;
u32 lkey = xprt->sc_pd->local_dma_lkey;
unsigned int i; unsigned int i;
for (i = 0; i < ctxt->mapped_sges; i++) { for (i = 0; i < ctxt->mapped_sges; i++)
/* ib_dma_unmap_page(device,
* Unmap the DMA addr in the SGE if the lkey matches ctxt->sge[i].addr,
* the local_dma_lkey, otherwise, ignore it since it is ctxt->sge[i].length,
* an FRMR lkey and will be unmapped later when the ctxt->direction);
* last WR that uses it completes.
*/
if (ctxt->sge[i].lkey == lkey)
ib_dma_unmap_page(device,
ctxt->sge[i].addr,
ctxt->sge[i].length,
ctxt->direction);
}
ctxt->mapped_sges = 0; ctxt->mapped_sges = 0;
} }