[PATCH v1 11/18] xprtrdma: Save I/O direction in struct rpcrdma_frwr

Chuck Lever
2016-04-11T20:11:40Z

Move the the I/O direction field from rpcrdma_mr_seg into the
rpcrdma_frmr. This makes it possible to perform the DMA unmapping
long after the rpcrdma_mr_seg has been released and re-used.

Signed-off-by: Chuck Lever <chuck.lever-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
---
net/sunrpc/xprtrdma/frwr_ops.c | 6 +++---
net/sunrpc/xprtrdma/xprt_rdma.h | 1 +
2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/net/sunrpc/xprtrdma/frwr_ops.c b/net/sunrpc/xprtrdma/frwr_ops.c
index 7c22e9e..e1e6ac1 100644
--- 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 abfce80..0b3aa54 100644
--- a/net/sunrpc/xprtrdma/xprt_rdma.h
+++ b/net/sunrpc/xprtrdma/xprt_rdma.h
@@ -222,6 +222,7 @@ 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;

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