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xprtrdma: Save I/O direction in struct rpcrdma_frwr

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Move the the I/O direction field from rpcrdma_mr_seg into the
rpcrdma_frmr.

This makes it possible to DMA-unmap the frwr long after an RPC has
exited and its rpcrdma_mr_seg array has been released and re-used.
This might occur if an RPC times out while waiting for a new
connection to be established.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2016-05-02 14:42:04 -04:00 committed by Anna Schumaker
parent 55fdfce101
commit a3aa8b2b84
2 changed files with 4 additions and 3 deletions
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6
net/sunrpc/xprtrdma/frwr_ops.c
View file

@ -416,6 +416,7 @@ frwr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
break;
}
frmr->fr_nents = i;
frmr->fr_dir = direction;
dma_nents = ib_dma_map_sg(device, frmr->fr_sg, frmr->fr_nents, direction);
if (!dma_nents) {
@ -455,7 +456,6 @@ frwr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
if (rc)
goto out_senderr;
seg1->mr_dir = direction;
seg1->rl_mw = mw;
seg1->mr_rkey = mr->rkey;
seg1->mr_base = mr->iova;
@ -500,7 +500,7 @@ __frwr_dma_unmap(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
seg->rl_mw = NULL;
ib_dma_unmap_sg(device, f->fr_sg, f->fr_nents, seg->mr_dir);
ib_dma_unmap_sg(device, f->fr_sg, f->fr_nents, f->fr_dir);
if (!rc)
rpcrdma_put_mw(r_xprt, mw);
@ -611,7 +611,7 @@ frwr_op_unmap(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg)
invalidate_wr->ex.invalidate_rkey = frmr->fr_mr->rkey;
DECR_CQCOUNT(&r_xprt->rx_ep);
ib_dma_unmap_sg(ia->ri_device, frmr->fr_sg, frmr->fr_nents, seg1->mr_dir);
ib_dma_unmap_sg(ia->ri_device, frmr->fr_sg, frmr->fr_nents, frmr->fr_dir);
read_lock(&ia->ri_qplock);
rc = ib_post_send(ia->ri_id->qp, invalidate_wr, &bad_wr);
read_unlock(&ia->ri_qplock);

1
net/sunrpc/xprtrdma/xprt_rdma.h
View file

@ -224,6 +224,7 @@ enum rpcrdma_frmr_state {
struct rpcrdma_frmr {
struct scatterlist *fr_sg;
int fr_nents;
enum dma_data_direction fr_dir;
struct ib_mr *fr_mr;
struct ib_cqe fr_cqe;
enum rpcrdma_frmr_state fr_state;