Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 436 insertions, 0 deletions

diff --git a/kernel/include/linux/sunrpc/xprt.h b/kernel/include/linux/sunrpc/xprt.h
new file mode 100644
index 000000000..8b93ef53d
--- /dev/null
+++ b/kernel/include/linux/sunrpc/xprt.h
@@ -0,0 +1,436 @@
+/*
+ *  linux/include/linux/sunrpc/xprt.h
+ *
+ *  Declarations for the RPC transport interface.
+ *
+ *  Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#ifndef _LINUX_SUNRPC_XPRT_H
+#define _LINUX_SUNRPC_XPRT_H
+
+#include <linux/uio.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/ktime.h>
+#include <linux/sunrpc/sched.h>
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/msg_prot.h>
+
+#ifdef __KERNEL__
+
+#define RPC_MIN_SLOT_TABLE	(2U)
+#define RPC_DEF_SLOT_TABLE	(16U)
+#define RPC_MAX_SLOT_TABLE_LIMIT	(65536U)
+#define RPC_MAX_SLOT_TABLE	RPC_MAX_SLOT_TABLE_LIMIT
+
+#define RPC_CWNDSHIFT		(8U)
+#define RPC_CWNDSCALE		(1U << RPC_CWNDSHIFT)
+#define RPC_INITCWND		RPC_CWNDSCALE
+#define RPC_MAXCWND(xprt)	((xprt)->max_reqs << RPC_CWNDSHIFT)
+#define RPCXPRT_CONGESTED(xprt) ((xprt)->cong >= (xprt)->cwnd)
+
+/*
+ * This describes a timeout strategy
+ */
+struct rpc_timeout {
+	unsigned long		to_initval,		/* initial timeout */
+				to_maxval,		/* max timeout */
+				to_increment;		/* if !exponential */
+	unsigned int		to_retries;		/* max # of retries */
+	unsigned char		to_exponential;
+};
+
+enum rpc_display_format_t {
+	RPC_DISPLAY_ADDR = 0,
+	RPC_DISPLAY_PORT,
+	RPC_DISPLAY_PROTO,
+	RPC_DISPLAY_HEX_ADDR,
+	RPC_DISPLAY_HEX_PORT,
+	RPC_DISPLAY_NETID,
+	RPC_DISPLAY_MAX,
+};
+
+struct rpc_task;
+struct rpc_xprt;
+struct seq_file;
+
+/*
+ * This describes a complete RPC request
+ */
+struct rpc_rqst {
+	/*
+	 * This is the user-visible part
+	 */
+	struct rpc_xprt *	rq_xprt;		/* RPC client */
+	struct xdr_buf		rq_snd_buf;		/* send buffer */
+	struct xdr_buf		rq_rcv_buf;		/* recv buffer */
+
+	/*
+	 * This is the private part
+	 */
+	struct rpc_task *	rq_task;	/* RPC task data */
+	struct rpc_cred *	rq_cred;	/* Bound cred */
+	__be32			rq_xid;		/* request XID */
+	int			rq_cong;	/* has incremented xprt->cong */
+	u32			rq_seqno;	/* gss seq no. used on req. */
+	int			rq_enc_pages_num;
+	struct page		**rq_enc_pages;	/* scratch pages for use by
+						   gss privacy code */
+	void (*rq_release_snd_buf)(struct rpc_rqst *); /* release rq_enc_pages */
+	struct list_head	rq_list;
+
+	__u32 *			rq_buffer;	/* XDR encode buffer */
+	size_t			rq_callsize,
+				rq_rcvsize;
+	size_t			rq_xmit_bytes_sent;	/* total bytes sent */
+	size_t			rq_reply_bytes_recvd;	/* total reply bytes */
+							/* received */
+
+	struct xdr_buf		rq_private_buf;		/* The receive buffer
+							 * used in the softirq.
+							 */
+	unsigned long		rq_majortimeo;	/* major timeout alarm */
+	unsigned long		rq_timeout;	/* Current timeout value */
+	ktime_t			rq_rtt;		/* round-trip time */
+	unsigned int		rq_retries;	/* # of retries */
+	unsigned int		rq_connect_cookie;
+						/* A cookie used to track the
+						   state of the transport
+						   connection */
+	
+	/*
+	 * Partial send handling
+	 */
+	u32			rq_bytes_sent;	/* Bytes we have sent */
+
+	ktime_t			rq_xtime;	/* transmit time stamp */
+	int			rq_ntrans;
+
+#if defined(CONFIG_SUNRPC_BACKCHANNEL)
+	struct list_head	rq_bc_list;	/* Callback service list */
+	unsigned long		rq_bc_pa_state;	/* Backchannel prealloc state */
+	struct list_head	rq_bc_pa_list;	/* Backchannel prealloc list */
+#endif /* CONFIG_SUNRPC_BACKCHANEL */
+};
+#define rq_svec			rq_snd_buf.head
+#define rq_slen			rq_snd_buf.len
+
+struct rpc_xprt_ops {
+	void		(*set_buffer_size)(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize);
+	int		(*reserve_xprt)(struct rpc_xprt *xprt, struct rpc_task *task);
+	void		(*release_xprt)(struct rpc_xprt *xprt, struct rpc_task *task);
+	void		(*alloc_slot)(struct rpc_xprt *xprt, struct rpc_task *task);
+	void		(*rpcbind)(struct rpc_task *task);
+	void		(*set_port)(struct rpc_xprt *xprt, unsigned short port);
+	void		(*connect)(struct rpc_xprt *xprt, struct rpc_task *task);
+	void *		(*buf_alloc)(struct rpc_task *task, size_t size);
+	void		(*buf_free)(void *buffer);
+	int		(*send_request)(struct rpc_task *task);
+	void		(*set_retrans_timeout)(struct rpc_task *task);
+	void		(*timer)(struct rpc_xprt *xprt, struct rpc_task *task);
+	void		(*release_request)(struct rpc_task *task);
+	void		(*close)(struct rpc_xprt *xprt);
+	void		(*destroy)(struct rpc_xprt *xprt);
+	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,
+	XPRT_TRANSPORT_LOCAL	= 257,
+};
+
+struct rpc_xprt {
+	atomic_t		count;		/* Reference count */
+	struct rpc_xprt_ops *	ops;		/* transport methods */
+
+	const struct rpc_timeout *timeout;	/* timeout parms */
+	struct sockaddr_storage	addr;		/* server address */
+	size_t			addrlen;	/* size of server address */
+	int			prot;		/* IP protocol */
+
+	unsigned long		cong;		/* current congestion */
+	unsigned long		cwnd;		/* congestion window */
+
+	size_t			max_payload;	/* largest RPC payload size,
+						   in bytes */
+	unsigned int		tsh_size;	/* size of transport specific
+						   header */
+
+	struct rpc_wait_queue	binding;	/* requests waiting on rpcbind */
+	struct rpc_wait_queue	sending;	/* requests waiting to send */
+	struct rpc_wait_queue	pending;	/* requests in flight */
+	struct rpc_wait_queue	backlog;	/* waiting for slot */
+	struct list_head	free;		/* free slots */
+	unsigned int		max_reqs;	/* max number of slots */
+	unsigned int		min_reqs;	/* min number of slots */
+	atomic_t		num_reqs;	/* total slots */
+	unsigned long		state;		/* transport state */
+	unsigned char		resvport   : 1; /* use a reserved port */
+	unsigned int		swapper;	/* we're swapping over this
+						   transport */
+	unsigned int		bind_index;	/* bind function index */
+
+	/*
+	 * Connection of transports
+	 */
+	unsigned long		bind_timeout,
+				reestablish_timeout;
+	unsigned int		connect_cookie;	/* A cookie that gets bumped
+						   every time the transport
+						   is reconnected */
+
+	/*
+	 * Disconnection of idle transports
+	 */
+	struct work_struct	task_cleanup;
+	struct timer_list	timer;
+	unsigned long		last_used,
+				idle_timeout;
+
+	/*
+	 * Send stuff
+	 */
+	spinlock_t		transport_lock;	/* lock transport info */
+	spinlock_t		reserve_lock;	/* lock slot table */
+	u32			xid;		/* Next XID value to use */
+	struct rpc_task *	snd_task;	/* Task blocked in send */
+	struct svc_xprt		*bc_xprt;	/* NFSv4.1 backchannel */
+#if defined(CONFIG_SUNRPC_BACKCHANNEL)
+	struct svc_serv		*bc_serv;       /* The RPC service which will */
+						/* process the callback */
+	unsigned int		bc_alloc_count;	/* Total number of preallocs */
+	spinlock_t		bc_pa_lock;	/* Protects the preallocated
+						 * items */
+	struct list_head	bc_pa_list;	/* List of preallocated
+						 * backchannel rpc_rqst's */
+#endif /* CONFIG_SUNRPC_BACKCHANNEL */
+	struct list_head	recv;
+
+	struct {
+		unsigned long		bind_count,	/* total number of binds */
+					connect_count,	/* total number of connects */
+					connect_start,	/* connect start timestamp */
+					connect_time,	/* jiffies waiting for connect */
+					sends,		/* how many complete requests */
+					recvs,		/* how many complete requests */
+					bad_xids,	/* lookup_rqst didn't find XID */
+					max_slots;	/* max rpc_slots used */
+
+		unsigned long long	req_u,		/* average requests on the wire */
+					bklog_u,	/* backlog queue utilization */
+					sending_u,	/* send q utilization */
+					pending_u;	/* pend q utilization */
+	} stat;
+
+	struct net		*xprt_net;
+	const char		*servername;
+	const char		*address_strings[RPC_DISPLAY_MAX];
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+	struct dentry		*debugfs;		/* debugfs directory */
+#endif
+};
+
+#if defined(CONFIG_SUNRPC_BACKCHANNEL)
+/*
+ * Backchannel flags
+ */
+#define	RPC_BC_PA_IN_USE	0x0001		/* Preallocated backchannel */
+						/* buffer in use */
+#endif /* CONFIG_SUNRPC_BACKCHANNEL */
+
+#if defined(CONFIG_SUNRPC_BACKCHANNEL)
+static inline int bc_prealloc(struct rpc_rqst *req)
+{
+	return test_bit(RPC_BC_PA_IN_USE, &req->rq_bc_pa_state);
+}
+#else
+static inline int bc_prealloc(struct rpc_rqst *req)
+{
+	return 0;
+}
+#endif /* CONFIG_SUNRPC_BACKCHANNEL */
+
+#define XPRT_CREATE_INFINITE_SLOTS	(1U)
+#define XPRT_CREATE_NO_IDLE_TIMEOUT	(1U << 1)
+
+struct xprt_create {
+	int			ident;		/* XPRT_TRANSPORT identifier */
+	struct net *		net;
+	struct sockaddr *	srcaddr;	/* optional local address */
+	struct sockaddr *	dstaddr;	/* remote peer address */
+	size_t			addrlen;
+	const char		*servername;
+	struct svc_xprt		*bc_xprt;	/* NFSv4.1 backchannel */
+	unsigned int		flags;
+};
+
+struct xprt_class {
+	struct list_head	list;
+	int			ident;		/* XPRT_TRANSPORT identifier */
+	struct rpc_xprt *	(*setup)(struct xprt_create *);
+	struct module		*owner;
+	char			name[32];
+};
+
+/*
+ * Generic internal transport functions
+ */
+struct rpc_xprt		*xprt_create_transport(struct xprt_create *args);
+void			xprt_connect(struct rpc_task *task);
+void			xprt_reserve(struct rpc_task *task);
+void			xprt_retry_reserve(struct rpc_task *task);
+int			xprt_reserve_xprt(struct rpc_xprt *xprt, struct rpc_task *task);
+int			xprt_reserve_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task);
+void			xprt_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task);
+void			xprt_lock_and_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task);
+bool			xprt_prepare_transmit(struct rpc_task *task);
+void			xprt_transmit(struct rpc_task *task);
+void			xprt_end_transmit(struct rpc_task *task);
+int			xprt_adjust_timeout(struct rpc_rqst *req);
+void			xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task);
+void			xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task);
+void			xprt_release(struct rpc_task *task);
+void			xprt_put(struct rpc_xprt *xprt);
+struct rpc_xprt *	xprt_alloc(struct net *net, size_t size,
+				unsigned int num_prealloc,
+				unsigned int max_req);
+void			xprt_free(struct rpc_xprt *);
+
+/**
+ * xprt_get - return a reference to an RPC transport.
+ * @xprt: pointer to the transport
+ *
+ */
+static inline struct rpc_xprt *xprt_get(struct rpc_xprt *xprt)
+{
+	if (atomic_inc_not_zero(&xprt->count))
+		return xprt;
+	return NULL;
+}
+
+static inline __be32 *xprt_skip_transport_header(struct rpc_xprt *xprt, __be32 *p)
+{
+	return p + xprt->tsh_size;
+}
+
+/*
+ * Transport switch helper functions
+ */
+int			xprt_register_transport(struct xprt_class *type);
+int			xprt_unregister_transport(struct xprt_class *type);
+int			xprt_load_transport(const char *);
+void			xprt_set_retrans_timeout_def(struct rpc_task *task);
+void			xprt_set_retrans_timeout_rtt(struct rpc_task *task);
+void			xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status);
+void			xprt_wait_for_buffer_space(struct rpc_task *task, rpc_action action);
+void			xprt_write_space(struct rpc_xprt *xprt);
+void			xprt_adjust_cwnd(struct rpc_xprt *xprt, struct rpc_task *task, int result);
+struct rpc_rqst *	xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid);
+void			xprt_complete_rqst(struct rpc_task *task, int copied);
+void			xprt_release_rqst_cong(struct rpc_task *task);
+void			xprt_disconnect_done(struct rpc_xprt *xprt);
+void			xprt_force_disconnect(struct rpc_xprt *xprt);
+void			xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie);
+int			xs_swapper(struct rpc_xprt *xprt, int enable);
+
+bool			xprt_lock_connect(struct rpc_xprt *, struct rpc_task *, void *);
+void			xprt_unlock_connect(struct rpc_xprt *, void *);
+
+/*
+ * Reserved bit positions in xprt->state
+ */
+#define XPRT_LOCKED		(0)
+#define XPRT_CONNECTED		(1)
+#define XPRT_CONNECTING		(2)
+#define XPRT_CLOSE_WAIT		(3)
+#define XPRT_BOUND		(4)
+#define XPRT_BINDING		(5)
+#define XPRT_CLOSING		(6)
+#define XPRT_CONGESTED		(9)
+
+static inline void xprt_set_connected(struct rpc_xprt *xprt)
+{
+	set_bit(XPRT_CONNECTED, &xprt->state);
+}
+
+static inline void xprt_clear_connected(struct rpc_xprt *xprt)
+{
+	clear_bit(XPRT_CONNECTED, &xprt->state);
+}
+
+static inline int xprt_connected(struct rpc_xprt *xprt)
+{
+	return test_bit(XPRT_CONNECTED, &xprt->state);
+}
+
+static inline int xprt_test_and_set_connected(struct rpc_xprt *xprt)
+{
+	return test_and_set_bit(XPRT_CONNECTED, &xprt->state);
+}
+
+static inline int xprt_test_and_clear_connected(struct rpc_xprt *xprt)
+{
+	return test_and_clear_bit(XPRT_CONNECTED, &xprt->state);
+}
+
+static inline void xprt_clear_connecting(struct rpc_xprt *xprt)
+{
+	smp_mb__before_atomic();
+	clear_bit(XPRT_CONNECTING, &xprt->state);
+	smp_mb__after_atomic();
+}
+
+static inline int xprt_connecting(struct rpc_xprt *xprt)
+{
+	return test_bit(XPRT_CONNECTING, &xprt->state);
+}
+
+static inline int xprt_test_and_set_connecting(struct rpc_xprt *xprt)
+{
+	return test_and_set_bit(XPRT_CONNECTING, &xprt->state);
+}
+
+static inline void xprt_set_bound(struct rpc_xprt *xprt)
+{
+	test_and_set_bit(XPRT_BOUND, &xprt->state);
+}
+
+static inline int xprt_bound(struct rpc_xprt *xprt)
+{
+	return test_bit(XPRT_BOUND, &xprt->state);
+}
+
+static inline void xprt_clear_bound(struct rpc_xprt *xprt)
+{
+	clear_bit(XPRT_BOUND, &xprt->state);
+}
+
+static inline void xprt_clear_binding(struct rpc_xprt *xprt)
+{
+	smp_mb__before_atomic();
+	clear_bit(XPRT_BINDING, &xprt->state);
+	smp_mb__after_atomic();
+}
+
+static inline int xprt_test_and_set_binding(struct rpc_xprt *xprt)
+{
+	return test_and_set_bit(XPRT_BINDING, &xprt->state);
+}
+
+#endif /* __KERNEL__*/
+
+#endif /* _LINUX_SUNRPC_XPRT_H */