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path: root/net/sunrpc/xprtrdma/physical_ops.c
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Diffstat (limited to 'net/sunrpc/xprtrdma/physical_ops.c')
-rw-r--r--net/sunrpc/xprtrdma/physical_ops.c39
1 files changed, 25 insertions, 14 deletions
diff --git a/net/sunrpc/xprtrdma/physical_ops.c b/net/sunrpc/xprtrdma/physical_ops.c
index 481b9b6f4..3750596cc 100644
--- a/net/sunrpc/xprtrdma/physical_ops.c
+++ b/net/sunrpc/xprtrdma/physical_ops.c
@@ -36,8 +36,11 @@ physical_op_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep,
__func__, PTR_ERR(mr));
return -ENOMEM;
}
-
ia->ri_dma_mr = mr;
+
+ rpcrdma_set_max_header_sizes(ia, cdata, min_t(unsigned int,
+ RPCRDMA_MAX_DATA_SEGS,
+ RPCRDMA_MAX_HDR_SEGS));
return 0;
}
@@ -47,7 +50,7 @@ static size_t
physical_op_maxpages(struct rpcrdma_xprt *r_xprt)
{
return min_t(unsigned int, RPCRDMA_MAX_DATA_SEGS,
- rpcrdma_max_segments(r_xprt));
+ RPCRDMA_MAX_HDR_SEGS);
}
static int
@@ -71,17 +74,6 @@ physical_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
return 1;
}
-/* Unmap a memory region, but leave it registered.
- */
-static int
-physical_op_unmap(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg)
-{
- struct rpcrdma_ia *ia = &r_xprt->rx_ia;
-
- rpcrdma_unmap_one(ia->ri_device, seg);
- return 1;
-}
-
/* DMA unmap all memory regions that were mapped for "req".
*/
static void
@@ -94,6 +86,25 @@ physical_op_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req)
rpcrdma_unmap_one(device, &req->rl_segments[i++]);
}
+/* Use a slow, safe mechanism to invalidate all memory regions
+ * that were registered for "req".
+ *
+ * For physical memory registration, there is no good way to
+ * fence a single MR that has been advertised to the server. The
+ * client has already handed the server an R_key that cannot be
+ * invalidated and is shared by all MRs on this connection.
+ * Tearing down the PD might be the only safe choice, but it's
+ * not clear that a freshly acquired DMA R_key would be different
+ * than the one used by the PD that was just destroyed.
+ * FIXME.
+ */
+static void
+physical_op_unmap_safe(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
+ bool sync)
+{
+ physical_op_unmap_sync(r_xprt, req);
+}
+
static void
physical_op_destroy(struct rpcrdma_buffer *buf)
{
@@ -102,7 +113,7 @@ physical_op_destroy(struct rpcrdma_buffer *buf)
const struct rpcrdma_memreg_ops rpcrdma_physical_memreg_ops = {
.ro_map = physical_op_map,
.ro_unmap_sync = physical_op_unmap_sync,
- .ro_unmap = physical_op_unmap,
+ .ro_unmap_safe = physical_op_unmap_safe,
.ro_open = physical_op_open,
.ro_maxpages = physical_op_maxpages,
.ro_init = physical_op_init,