nfsd: Update NFS server comments related to RDMA support

The server does indeed now support NFSv4.1 on RDMA transports. It
does not support shifting an RDMA-capable TCP transport (such as
iWARP) to RDMA mode.

Reported-by: Shirley Ma <shirley.ma@oracle.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

2 files changed, 3 insertions, 4 deletions

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 9d20c6a54734..d4b0b789ea24 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -2711,10 +2711,9 @@ nfsd4_create_session(struct svc_rqst *rqstp,
                 goto out_free_conn;
         }
         status = nfs_ok;
-        /*
-         * We do not support RDMA or persistent sessions
-         */
+        /* Persistent sessions are not supported */
         cr_ses->flags &= ~SESSION4_PERSIST;
+        /* Upshifting from TCP to RDMA is not supported */
         cr_ses->flags &= ~SESSION4_RDMA;
 
         init_session(rqstp, new, conf, cr_ses);
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 1600ec470ce7..aa87954b4af2 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -3063,7 +3063,7 @@ static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp,
                 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
                                                 NFS4_MAX_SESSIONID_LEN);
                 *p++ = cpu_to_be32(bcts->dir);
-                /* Sorry, we do not yet support RDMA over 4.1: */
+                /* Upshifting from TCP to RDMA is not supported */
                 *p++ = cpu_to_be32(0);
         }
         return nfserr;