NFS: support RDMA mounts

Adds hooks to the string-based NFS mount to support an "rdma" protocol option.

Signed-off-by: Tom Talpey <tmt@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

2 files changed, 21 insertions, 2 deletions

diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 6f6755529788..a532ee12740a 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -24,6 +24,7 @@
 #include <linux/sunrpc/stats.h>
 #include <linux/sunrpc/metrics.h>
 #include <linux/sunrpc/xprtsock.h>
+#include <linux/sunrpc/xprtrdma.h>
 #include <linux/nfs_fs.h>
 #include <linux/nfs_mount.h>
 #include <linux/nfs4_mount.h>
@@ -342,6 +343,7 @@ static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
 
         switch (proto) {
         case XPRT_TRANSPORT_TCP:
+        case XPRT_TRANSPORT_RDMA:
                 if (!to->to_initval)
                         to->to_initval = 60 * HZ;
                 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 347c36341e53..11ab7ff6e087 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -34,6 +34,7 @@
 #include <linux/sunrpc/stats.h>
 #include <linux/sunrpc/metrics.h>
 #include <linux/sunrpc/xprtsock.h>
+#include <linux/sunrpc/xprtrdma.h>
 #include <linux/nfs_fs.h>
 #include <linux/nfs_mount.h>
 #include <linux/nfs4_mount.h>
@@ -68,7 +69,7 @@ enum {
         Opt_ac, Opt_noac,
         Opt_lock, Opt_nolock,
         Opt_v2, Opt_v3,
-        Opt_udp, Opt_tcp,
+        Opt_udp, Opt_tcp, Opt_rdma,
         Opt_acl, Opt_noacl,
         Opt_rdirplus, Opt_nordirplus,
         Opt_sharecache, Opt_nosharecache,
@@ -114,6 +115,7 @@ static match_table_t nfs_mount_option_tokens = {
         { Opt_v3, "v3" },
         { Opt_udp, "udp" },
         { Opt_tcp, "tcp" },
+        { Opt_rdma, "rdma" },
         { Opt_acl, "acl" },
         { Opt_noacl, "noacl" },
         { Opt_rdirplus, "rdirplus" },
@@ -153,7 +155,7 @@ static match_table_t nfs_mount_option_tokens = {
 };
 
 enum {
-        Opt_xprt_udp, Opt_xprt_tcp,
+        Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
 
         Opt_xprt_err
 };
@@ -161,6 +163,7 @@ enum {
 static match_table_t nfs_xprt_protocol_tokens = {
         { Opt_xprt_udp, "udp" },
         { Opt_xprt_tcp, "tcp" },
+        { Opt_xprt_rdma, "rdma" },
 
         { Opt_xprt_err, NULL }
 };
@@ -668,6 +671,12 @@ static int nfs_parse_mount_options(char *raw,
                         mnt->timeo = 600;
                         mnt->retrans = 2;
                         break;
+                case Opt_rdma:
+                        mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
+                        mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
+                        mnt->timeo = 600;
+                        mnt->retrans = 2;
+                        break;
                 case Opt_acl:
                         mnt->flags &= ~NFS_MOUNT_NOACL;
                         break;
@@ -883,6 +892,13 @@ static int nfs_parse_mount_options(char *raw,
                                 mnt->timeo = 600;
                                 mnt->retrans = 2;
                                 break;
+                        case Opt_xprt_rdma:
+                                /* vector side protocols to TCP */
+                                mnt->flags |= NFS_MOUNT_TCP;
+                                mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
+                                mnt->timeo = 600;
+                                mnt->retrans = 2;
+                                break;
                         default:
                                 goto out_unrec_xprt;
                         }
@@ -902,6 +918,7 @@ static int nfs_parse_mount_options(char *raw,
                         case Opt_xprt_tcp:
                                 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
                                 break;
+                        case Opt_xprt_rdma: /* not used for side protocols */
                         default:
                                 goto out_unrec_xprt;
                         }