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xprtrdma: Fix DMA scatter-gather list mapping imbalance

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The @nents value that was passed to ib_dma_map_sg() has to be passed
to the matching ib_dma_unmap_sg() call. If ib_dma_map_sg() choses to
concatenate sg entries, it will return a different nents value than
it was passed.

The bug was exposed by recent changes to the AMD IOMMU driver, which
enabled sg entry concatenation.

Looking all the way back to commit 4143f34e01 ("xprtrdma: Port to
new memory registration API") and reviewing other kernel ULPs, it's
not clear that the frwr_map() logic was ever correct for this case.

Reported-by: Andre Tomt <andre@tomt.net>
Suggested-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Cc: stable@vger.kernel.org
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2020-02-12 11:12:30 -05:00 committed by Anna Schumaker
parent efeda80da3
commit ca1c671302
1 changed files with 7 additions and 6 deletions
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13
net/sunrpc/xprtrdma/frwr_ops.c
View file

@ -288,8 +288,8 @@ struct rpcrdma_mr_seg *frwr_map(struct rpcrdma_xprt *r_xprt,
{
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
struct ib_reg_wr *reg_wr;
int i, n, dma_nents;
struct ib_mr *ibmr;
int i, n;
u8 key;
if (nsegs > ia->ri_max_frwr_depth)
@ -313,15 +313,16 @@ struct rpcrdma_mr_seg *frwr_map(struct rpcrdma_xprt *r_xprt,
break;
}
mr->mr_dir = rpcrdma_data_dir(writing);
mr->mr_nents = i;
mr->mr_nents =
ib_dma_map_sg(ia->ri_id->device, mr->mr_sg, i, mr->mr_dir);
if (!mr->mr_nents)
dma_nents = ib_dma_map_sg(ia->ri_id->device, mr->mr_sg, mr->mr_nents,
mr->mr_dir);
if (!dma_nents)
goto out_dmamap_err;
ibmr = mr->frwr.fr_mr;
n = ib_map_mr_sg(ibmr, mr->mr_sg, mr->mr_nents, NULL, PAGE_SIZE);
if (unlikely(n != mr->mr_nents))
n = ib_map_mr_sg(ibmr, mr->mr_sg, dma_nents, NULL, PAGE_SIZE);
if (n != dma_nents)
goto out_mapmr_err;
ibmr->iova &= 0x00000000ffffffff;