[PATCH v4 3/3] svcrdma: Mark Read chunks

[Chuck Lever <cel@kernel.org>]

From: Chuck Lever <chuck.lever@oracle.com>

The upper layer may want to know when the receive buffer's .pages
array is guaranteed to contain only an opaque payload. This permits
the upper layer to optimize its buffer handling.

NB: Since svc_rdma_recvfrom.c is under net/, we use the comment
style that is preferred in the networking layer.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 net/sunrpc/xprtrdma/svc_rdma_recvfrom.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
index e7e4a39ca6c6..b1a0c72f73de 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
@@ -815,6 +815,11 @@ static void svc_rdma_read_complete_one(struct svc_rqst *rqstp,
 	buf->page_len = length;
 	buf->len += length;
 	buf->buflen += length;
+
+	/* Transport guarantees that only the chunk payload
+	 * appears in buf->pages.
+	 */
+	buf->flags |= XDRBUF_READ;
 }
 
 /* Finish constructing the RPC Call message in rqstp::rq_arg.
-- 
2.51.0