xprtrdma: Save I/O direction in struct rpcrdma_frwr

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>

diff --git a/net/sunrpc/xprtrdma/frwr_ops.c b/net/sunrpc/xprtrdma/frwr_ops.c
index 7c22e9e..e1e6ac1 100644 (file)
--- a/net/sunrpc/xprtrdma/frwr_ops.c
+++ b/net/sunrpc/xprtrdma/frwr_ops.c
@@ -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);

diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h
index 612e3de..b5793cb 100644 (file)
--- a/net/sunrpc/xprtrdma/xprt_rdma.h
+++ b/net/sunrpc/xprtrdma/xprt_rdma.h
@@ -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;