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File Content: `xprt.h`

/* SPDX-License-Identifier: GPL-2.0 */
/*
 *  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/kref.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;
struct svc_serv;
struct net;

/*
 * 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 */

	union {
		struct list_head	rq_list;	/* Slot allocation list */
		struct rb_node		rq_recv;	/* Receive queue */
	};

	struct list_head	rq_xmit;	/* Send queue */
	struct list_head	rq_xmit2;	/* Send queue */

	void			*rq_buffer;	/* Call XDR encode buffer */
	size_t			rq_callsize;
	void			*rq_rbuffer;	/* Reply XDR decode buffer */
	size_t			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 */
	atomic_t		rq_pin;
	
	/*
	 * 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		(*free_slot)(struct rpc_xprt *xprt,
				     struct rpc_rqst *req);
	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);
	int		(*buf_alloc)(struct rpc_task *task);
	void		(*buf_free)(struct rpc_task *task);
	void		(*prepare_request)(struct rpc_rqst *req);
	int		(*send_request)(struct rpc_rqst *req);
	void		(*wait_for_reply_request)(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		(*set_connect_timeout)(struct rpc_xprt *xprt,
					unsigned long connect_timeout,
					unsigned long reconnect_timeout);
	void		(*print_stats)(struct rpc_xprt *xprt, struct seq_file *seq);
	int		(*enable_swap)(struct rpc_xprt *xprt);
	void		(*disable_swap)(struct rpc_xprt *xprt);
	void		(*inject_disconnect)(struct rpc_xprt *xprt);
	int		(*bc_setup)(struct rpc_xprt *xprt,
				    unsigned int min_reqs);
	size_t		(*bc_maxpayload)(struct rpc_xprt *xprt);
	unsigned int	(*bc_num_slots)(struct rpc_xprt *xprt);
	void		(*bc_free_rqst)(struct rpc_rqst *rqst);
	void		(*bc_destroy)(struct rpc_xprt *xprt,
				      unsigned int max_reqs);
};

/*
 * 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_BC_RDMA	= XPRT_TRANSPORT_RDMA | XPRT_TRANSPORT_BC,
	XPRT_TRANSPORT_LOCAL	= 257,
};

struct rpc_xprt {
	struct kref		kref;		/* Reference count */
	const 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 */

	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 */
	unsigned int		num_reqs;	/* total slots */
	unsigned long		state;		/* transport state */
	unsigned char		resvport   : 1; /* use a reserved port */
	atomic_t		swapper;	/* we're swapping over this
						   transport */
	unsigned int		bind_index;	/* bind function index */

	/*
	 * Multipath
	 */
	struct list_head	xprt_switch;

	/*
	 * 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,
				connect_timeout,
				max_reconnect_timeout;

	/*
	 * Send stuff
	 */
	atomic_long_t		queuelen;
	spinlock_t		transport_lock;	/* lock transport info */
	spinlock_t		reserve_lock;	/* lock slot table */
	spinlock_t		queue_lock;	/* send/receive queue lock */
	u32			xid;		/* Next XID value to use */
	struct rpc_task *	snd_task;	/* Task blocked in send */

	struct list_head	xmit_queue;	/* Send queue */

	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_max;
	unsigned int		bc_alloc_count;	/* Total number of preallocs */
	atomic_t		bc_slot_count;	/* Number of allocated slots */
	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 rb_root		recv_queue;	/* Receive queue */

	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 */
	atomic_t		inject_disconnect;
#endif
	struct rcu_head		rcu;
};

#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 */
	struct rpc_xprt_switch	*bc_xps;
	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);
unsigned long		xprt_reconnect_delay(const struct rpc_xprt *xprt);
void			xprt_reconnect_backoff(struct rpc_xprt *xprt,
					       unsigned long init_to);
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_free_slot(struct rpc_xprt *xprt,
				       struct rpc_rqst *req);
void			xprt_request_prepare(struct rpc_rqst *req);
bool			xprt_prepare_transmit(struct rpc_task *task);
void			xprt_request_enqueue_transmit(struct rpc_task *task);
void			xprt_request_enqueue_receive(struct rpc_task *task);
void			xprt_request_wait_receive(struct rpc_task *task);
void			xprt_request_dequeue_xprt(struct rpc_task *task);
bool			xprt_request_need_retransmit(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);
struct rpc_xprt *	xprt_get(struct rpc_xprt *xprt);
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 *);

static inline int
xprt_enable_swap(struct rpc_xprt *xprt)
{
	return xprt->ops->enable_swap(xprt);
}

static inline void
xprt_disable_swap(struct rpc_xprt *xprt)
{
	xprt->ops->disable_swap(xprt);
}

/*
 * 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_wait_for_reply_request_def(struct rpc_task *task);
void			xprt_wait_for_reply_request_rtt(struct rpc_task *task);
void			xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status);
void			xprt_wait_for_buffer_space(struct rpc_xprt *xprt);
bool			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_update_rtt(struct rpc_task *task);
void			xprt_complete_rqst(struct rpc_task *task, int copied);
void			xprt_pin_rqst(struct rpc_rqst *req);
void			xprt_unpin_rqst(struct rpc_rqst *req);
void			xprt_release_rqst_cong(struct rpc_task *task);
bool			xprt_request_get_cong(struct rpc_xprt *xprt, struct rpc_rqst *req);
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);

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)
#define XPRT_CWND_WAIT		(10)
#define XPRT_WRITE_SPACE	(11)

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);
}

#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
extern unsigned int rpc_inject_disconnect;
static inline void xprt_inject_disconnect(struct rpc_xprt *xprt)
{
	if (!rpc_inject_disconnect)
		return;
	if (atomic_dec_return(&xprt->inject_disconnect))
		return;
	atomic_set(&xprt->inject_disconnect, rpc_inject_disconnect);
	xprt->ops->inject_disconnect(xprt);
}
#else
static inline void xprt_inject_disconnect(struct rpc_xprt *xprt)
{
}
#endif

#endif /* __KERNEL__*/

#endif /* _LINUX_SUNRPC_XPRT_H */
Name	Size	Permission
addr.h	5063 bytes	0644
auth.h	6223 bytes	0644
auth_gss.h	2411 bytes	0644
bc_xprt.h	2846 bytes	0644
cache.h	8741 bytes	0644
clnt.h	7976 bytes	0644
debug.h	2829 bytes	0644
gss_api.h	4636 bytes	0644
gss_asn1.h	3188 bytes	0644
gss_err.h	6068 bytes	0644
gss_krb5.h	11470 bytes	0644
gss_krb5_enctypes.h	1253 bytes	0644
metrics.h	3771 bytes	0644
msg_prot.h	6384 bytes	0644
rpc_pipe_fs.h	3767 bytes	0644
rpc_rdma.h	3954 bytes	0644
sched.h	10030 bytes	0644
stats.h	2055 bytes	0644
svc.h	18243 bytes	0644
svc_rdma.h	7199 bytes	0644
svc_xprt.h	6860 bytes	0644
svcauth.h	6370 bytes	0644
svcauth_gss.h	797 bytes	0644
svcsock.h	2140 bytes	0644
timer.h	1172 bytes	0644
types.h	497 bytes	0644
xdr.h	16357 bytes	0644
xprt.h	15923 bytes	0644
xprtmultipath.h	2109 bytes	0644
xprtrdma.h	3023 bytes	0644
xprtsock.h	1779 bytes	0644
Command Bosku:

File Content: xprt.h

File Content: `xprt.h`
