sunrpc: keep track of the xprt_class in rpc_xprt structure

We need to keep track of the type for a given transport.
Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

include/linux/sunrpc/xprt.h

@@ -53,6 +53,7 @@ enum rpc_display_format_t {
 
 struct rpc_task;
 struct rpc_xprt;
+struct xprt_class;
 struct seq_file;
 struct svc_serv;
 struct net;
@@ -289,6 +290,7 @@ struct rpc_xprt {
 	atomic_t		inject_disconnect;
 #endif
 	struct rcu_head		rcu;
+	const struct xprt_class	*xprt_class;
 };
 
 #if defined(CONFIG_SUNRPC_BACKCHANNEL)

net/sunrpc/xprtrdma/transport.c

@@ -73,6 +73,7 @@ unsigned int xprt_rdma_max_inline_read = RPCRDMA_DEF_INLINE;
 unsigned int xprt_rdma_max_inline_write = RPCRDMA_DEF_INLINE;
 unsigned int xprt_rdma_memreg_strategy		= RPCRDMA_FRWR;
 int xprt_rdma_pad_optimize;
+static struct xprt_class xprt_rdma;
 
 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
 
@@ -349,6 +350,7 @@ xprt_setup_rdma(struct xprt_create *args)
 	/* Ensure xprt->addr holds valid server TCP (not RDMA)
 	 * address, for any side protocols which peek at it */
 	xprt->prot = IPPROTO_TCP;
+	xprt->xprt_class = &xprt_rdma;
 	xprt->addrlen = args->addrlen;
 	memcpy(&xprt->addr, sap, xprt->addrlen);
 

net/sunrpc/xprtsock.c

@@ -91,6 +91,11 @@ static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
 
 static struct ctl_table_header *sunrpc_table_header;
 
+static struct xprt_class xs_local_transport;
+static struct xprt_class xs_udp_transport;
+static struct xprt_class xs_tcp_transport;
+static struct xprt_class xs_bc_tcp_transport;
+
 /*
  * FIXME: changing the UDP slot table size should also resize the UDP
  *        socket buffers for existing UDP transports
@@ -2779,6 +2784,7 @@ static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
 	transport = container_of(xprt, struct sock_xprt, xprt);
 
 	xprt->prot = 0;
+	xprt->xprt_class = &xs_local_transport;
 	xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
 
 	xprt->bind_timeout = XS_BIND_TO;
@@ -2848,6 +2854,7 @@ static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
 	transport = container_of(xprt, struct sock_xprt, xprt);
 
 	xprt->prot = IPPROTO_UDP;
+	xprt->xprt_class = &xs_udp_transport;
 	/* XXX: header size can vary due to auth type, IPv6, etc. */
 	xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
 
@@ -2928,6 +2935,7 @@ static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
 	transport = container_of(xprt, struct sock_xprt, xprt);
 
 	xprt->prot = IPPROTO_TCP;
+	xprt->xprt_class = &xs_tcp_transport;
 	xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
 
 	xprt->bind_timeout = XS_BIND_TO;
@@ -3001,6 +3009,7 @@ static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
 	transport = container_of(xprt, struct sock_xprt, xprt);
 
 	xprt->prot = IPPROTO_TCP;
+	xprt->xprt_class = &xs_bc_tcp_transport;
 	xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
 	xprt->timeout = &xs_tcp_default_timeout;