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authorAlexandros Batsakis <batsakis@netapp.com>2009-09-10 17:33:30 +0300
committerJ. Bruce Fields <bfields@citi.umich.edu>2009-09-13 15:46:15 -0400
commitf300baba5a1536070d6d77bf0c8c4ca999bb4f0f (patch)
tree648d0020d9a9325cfcb07571d9f11a5c797ee900
parent908329f2c08b8b5af7b394f709b0ee9c43b93041 (diff)
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nfsd41: sunrpc: add new xprt class for nfsv4.1 backchannel
[sunrpc: change idle timeout value for the backchannel] Signed-off-by: Alexandros Batsakis <batsakis@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
-rw-r--r--include/linux/sunrpc/clnt.h1
-rw-r--r--include/linux/sunrpc/xprt.h18
-rw-r--r--include/linux/sunrpc/xprtrdma.h5
-rw-r--r--include/linux/sunrpc/xprtsock.h11
-rw-r--r--net/sunrpc/clnt.c1
-rw-r--r--net/sunrpc/xprtsock.c96
6 files changed, 114 insertions, 18 deletions
diff --git a/include/linux/sunrpc/clnt.h b/include/linux/sunrpc/clnt.h
index 3d025588e56..8ed9642a5a7 100644
--- a/include/linux/sunrpc/clnt.h
+++ b/include/linux/sunrpc/clnt.h
@@ -114,6 +114,7 @@ struct rpc_create_args {
rpc_authflavor_t authflavor;
unsigned long flags;
char *client_name;
+ struct svc_xprt *bc_xprt; /* NFSv4.1 backchannel */
};
/* Values for "flags" field */
diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h
index 228d694dbb9..6f9457a75b8 100644
--- a/include/linux/sunrpc/xprt.h
+++ b/include/linux/sunrpc/xprt.h
@@ -124,6 +124,23 @@ struct rpc_xprt_ops {
void (*print_stats)(struct rpc_xprt *xprt, struct seq_file *seq);
};
+/*
+ * RPC transport identifiers
+ *
+ * To preserve compatibility with the historical use of raw IP protocol
+ * id's for transport selection, UDP and TCP identifiers are specified
+ * with the previous values. No such restriction exists for new transports,
+ * except that they may not collide with these values (17 and 6,
+ * respectively).
+ */
+#define XPRT_TRANSPORT_BC (1 << 31)
+enum xprt_transports {
+ XPRT_TRANSPORT_UDP = IPPROTO_UDP,
+ XPRT_TRANSPORT_TCP = IPPROTO_TCP,
+ XPRT_TRANSPORT_BC_TCP = IPPROTO_TCP | XPRT_TRANSPORT_BC,
+ XPRT_TRANSPORT_RDMA = 256
+};
+
struct rpc_xprt {
struct kref kref; /* Reference count */
struct rpc_xprt_ops * ops; /* transport methods */
@@ -232,6 +249,7 @@ struct xprt_create {
struct sockaddr * srcaddr; /* optional local address */
struct sockaddr * dstaddr; /* remote peer address */
size_t addrlen;
+ struct svc_xprt *bc_xprt; /* NFSv4.1 backchannel */
};
struct xprt_class {
diff --git a/include/linux/sunrpc/xprtrdma.h b/include/linux/sunrpc/xprtrdma.h
index 54a379c9e8e..c2f04e1ae15 100644
--- a/include/linux/sunrpc/xprtrdma.h
+++ b/include/linux/sunrpc/xprtrdma.h
@@ -41,11 +41,6 @@
#define _LINUX_SUNRPC_XPRTRDMA_H
/*
- * RPC transport identifier for RDMA
- */
-#define XPRT_TRANSPORT_RDMA 256
-
-/*
* rpcbind (v3+) RDMA netid.
*/
#define RPCBIND_NETID_RDMA "rdma"
diff --git a/include/linux/sunrpc/xprtsock.h b/include/linux/sunrpc/xprtsock.h
index c2a46c45c8f..3f14a02e9cc 100644
--- a/include/linux/sunrpc/xprtsock.h
+++ b/include/linux/sunrpc/xprtsock.h
@@ -13,17 +13,6 @@ int init_socket_xprt(void);
void cleanup_socket_xprt(void);
/*
- * RPC transport identifiers for UDP, TCP
- *
- * To preserve compatibility with the historical use of raw IP protocol
- * id's for transport selection, these are specified with the previous
- * values. No such restriction exists for new transports, except that
- * they may not collide with these values (17 and 6, respectively).
- */
-#define XPRT_TRANSPORT_UDP IPPROTO_UDP
-#define XPRT_TRANSPORT_TCP IPPROTO_TCP
-
-/*
* RPC slot table sizes for UDP, TCP transports
*/
extern unsigned int xprt_udp_slot_table_entries;
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index c1e467e1b07..7389804e3bb 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -288,6 +288,7 @@ struct rpc_clnt *rpc_create(struct rpc_create_args *args)
.srcaddr = args->saddress,
.dstaddr = args->address,
.addrlen = args->addrsize,
+ .bc_xprt = args->bc_xprt,
};
char servername[48];
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index d9a2b815714..bee41546575 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -2468,11 +2468,93 @@ static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
return ERR_PTR(-EINVAL);
}
+/**
+ * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
+ * @args: rpc transport creation arguments
+ *
+ */
+static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
+{
+ struct sockaddr *addr = args->dstaddr;
+ struct rpc_xprt *xprt;
+ struct sock_xprt *transport;
+ struct svc_sock *bc_sock;
+
+ if (!args->bc_xprt)
+ ERR_PTR(-EINVAL);
+
+ xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
+ if (IS_ERR(xprt))
+ return xprt;
+ transport = container_of(xprt, struct sock_xprt, xprt);
+
+ xprt->prot = IPPROTO_TCP;
+ xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
+ xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
+ xprt->timeout = &xs_tcp_default_timeout;
+
+ /* backchannel */
+ xprt_set_bound(xprt);
+ xprt->bind_timeout = 0;
+ xprt->connect_timeout = 0;
+ xprt->reestablish_timeout = 0;
+ xprt->idle_timeout = 0;
+
+ /*
+ * The backchannel uses the same socket connection as the
+ * forechannel
+ */
+ xprt->bc_xprt = args->bc_xprt;
+ bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
+ bc_sock->sk_bc_xprt = xprt;
+ transport->sock = bc_sock->sk_sock;
+ transport->inet = bc_sock->sk_sk;
+
+ xprt->ops = &bc_tcp_ops;
+
+ switch (addr->sa_family) {
+ case AF_INET:
+ xs_format_peer_addresses(xprt, "tcp",
+ RPCBIND_NETID_TCP);
+ break;
+ case AF_INET6:
+ xs_format_peer_addresses(xprt, "tcp",
+ RPCBIND_NETID_TCP6);
+ break;
+ default:
+ kfree(xprt);
+ return ERR_PTR(-EAFNOSUPPORT);
+ }
+
+ if (xprt_bound(xprt))
+ dprintk("RPC: set up xprt to %s (port %s) via %s\n",
+ xprt->address_strings[RPC_DISPLAY_ADDR],
+ xprt->address_strings[RPC_DISPLAY_PORT],
+ xprt->address_strings[RPC_DISPLAY_PROTO]);
+ else
+ dprintk("RPC: set up xprt to %s (autobind) via %s\n",
+ xprt->address_strings[RPC_DISPLAY_ADDR],
+ xprt->address_strings[RPC_DISPLAY_PROTO]);
+
+ /*
+ * Since we don't want connections for the backchannel, we set
+ * the xprt status to connected
+ */
+ xprt_set_connected(xprt);
+
+
+ if (try_module_get(THIS_MODULE))
+ return xprt;
+ kfree(xprt->slot);
+ kfree(xprt);
+ return ERR_PTR(-EINVAL);
+}
+
static struct xprt_class xs_udp_transport = {
.list = LIST_HEAD_INIT(xs_udp_transport.list),
.name = "udp",
.owner = THIS_MODULE,
- .ident = IPPROTO_UDP,
+ .ident = XPRT_TRANSPORT_UDP,
.setup = xs_setup_udp,
};
@@ -2480,10 +2562,18 @@ static struct xprt_class xs_tcp_transport = {
.list = LIST_HEAD_INIT(xs_tcp_transport.list),
.name = "tcp",
.owner = THIS_MODULE,
- .ident = IPPROTO_TCP,
+ .ident = XPRT_TRANSPORT_TCP,
.setup = xs_setup_tcp,
};
+static struct xprt_class xs_bc_tcp_transport = {
+ .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
+ .name = "tcp NFSv4.1 backchannel",
+ .owner = THIS_MODULE,
+ .ident = XPRT_TRANSPORT_BC_TCP,
+ .setup = xs_setup_bc_tcp,
+};
+
/**
* init_socket_xprt - set up xprtsock's sysctls, register with RPC client
*
@@ -2497,6 +2587,7 @@ int init_socket_xprt(void)
xprt_register_transport(&xs_udp_transport);
xprt_register_transport(&xs_tcp_transport);
+ xprt_register_transport(&xs_bc_tcp_transport);
return 0;
}
@@ -2516,6 +2607,7 @@ void cleanup_socket_xprt(void)
xprt_unregister_transport(&xs_udp_transport);
xprt_unregister_transport(&xs_tcp_transport);
+ xprt_unregister_transport(&xs_bc_tcp_transport);
}
static int param_set_uint_minmax(const char *val, struct kernel_param *kp,