437 lines
13 KiB
C
437 lines
13 KiB
C
/*
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* linux/include/linux/sunrpc/xprt.h
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*
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* Declarations for the RPC transport interface.
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*
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* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
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*/
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#ifndef _LINUX_SUNRPC_XPRT_H
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#define _LINUX_SUNRPC_XPRT_H
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#include <linux/uio.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/ktime.h>
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#include <linux/sunrpc/sched.h>
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#include <linux/sunrpc/xdr.h>
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#include <linux/sunrpc/msg_prot.h>
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#ifdef __KERNEL__
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#define RPC_MIN_SLOT_TABLE (2U)
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#define RPC_DEF_SLOT_TABLE (16U)
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#define RPC_MAX_SLOT_TABLE_LIMIT (65536U)
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#define RPC_MAX_SLOT_TABLE RPC_MAX_SLOT_TABLE_LIMIT
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#define RPC_CWNDSHIFT (8U)
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#define RPC_CWNDSCALE (1U << RPC_CWNDSHIFT)
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#define RPC_INITCWND RPC_CWNDSCALE
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#define RPC_MAXCWND(xprt) ((xprt)->max_reqs << RPC_CWNDSHIFT)
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#define RPCXPRT_CONGESTED(xprt) ((xprt)->cong >= (xprt)->cwnd)
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/*
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* This describes a timeout strategy
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*/
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struct rpc_timeout {
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unsigned long to_initval, /* initial timeout */
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to_maxval, /* max timeout */
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to_increment; /* if !exponential */
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unsigned int to_retries; /* max # of retries */
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unsigned char to_exponential;
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};
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enum rpc_display_format_t {
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RPC_DISPLAY_ADDR = 0,
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RPC_DISPLAY_PORT,
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RPC_DISPLAY_PROTO,
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RPC_DISPLAY_HEX_ADDR,
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RPC_DISPLAY_HEX_PORT,
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RPC_DISPLAY_NETID,
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RPC_DISPLAY_MAX,
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};
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struct rpc_task;
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struct rpc_xprt;
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struct seq_file;
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/*
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* This describes a complete RPC request
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*/
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struct rpc_rqst {
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/*
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* This is the user-visible part
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*/
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struct rpc_xprt * rq_xprt; /* RPC client */
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struct xdr_buf rq_snd_buf; /* send buffer */
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struct xdr_buf rq_rcv_buf; /* recv buffer */
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/*
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* This is the private part
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*/
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struct rpc_task * rq_task; /* RPC task data */
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struct rpc_cred * rq_cred; /* Bound cred */
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__be32 rq_xid; /* request XID */
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int rq_cong; /* has incremented xprt->cong */
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u32 rq_seqno; /* gss seq no. used on req. */
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int rq_enc_pages_num;
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struct page **rq_enc_pages; /* scratch pages for use by
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gss privacy code */
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void (*rq_release_snd_buf)(struct rpc_rqst *); /* release rq_enc_pages */
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struct list_head rq_list;
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__u32 * rq_buffer; /* XDR encode buffer */
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size_t rq_callsize,
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rq_rcvsize;
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size_t rq_xmit_bytes_sent; /* total bytes sent */
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size_t rq_reply_bytes_recvd; /* total reply bytes */
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/* received */
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struct xdr_buf rq_private_buf; /* The receive buffer
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* used in the softirq.
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*/
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unsigned long rq_majortimeo; /* major timeout alarm */
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unsigned long rq_timeout; /* Current timeout value */
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ktime_t rq_rtt; /* round-trip time */
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unsigned int rq_retries; /* # of retries */
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unsigned int rq_connect_cookie;
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/* A cookie used to track the
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state of the transport
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connection */
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/*
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* Partial send handling
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*/
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u32 rq_bytes_sent; /* Bytes we have sent */
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ktime_t rq_xtime; /* transmit time stamp */
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int rq_ntrans;
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#if defined(CONFIG_SUNRPC_BACKCHANNEL)
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struct list_head rq_bc_list; /* Callback service list */
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unsigned long rq_bc_pa_state; /* Backchannel prealloc state */
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struct list_head rq_bc_pa_list; /* Backchannel prealloc list */
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#endif /* CONFIG_SUNRPC_BACKCHANEL */
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};
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#define rq_svec rq_snd_buf.head
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#define rq_slen rq_snd_buf.len
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struct rpc_xprt_ops {
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void (*set_buffer_size)(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize);
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int (*reserve_xprt)(struct rpc_xprt *xprt, struct rpc_task *task);
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void (*release_xprt)(struct rpc_xprt *xprt, struct rpc_task *task);
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void (*alloc_slot)(struct rpc_xprt *xprt, struct rpc_task *task);
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void (*rpcbind)(struct rpc_task *task);
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void (*set_port)(struct rpc_xprt *xprt, unsigned short port);
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void (*connect)(struct rpc_xprt *xprt, struct rpc_task *task);
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void * (*buf_alloc)(struct rpc_task *task, size_t size);
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void (*buf_free)(void *buffer);
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int (*send_request)(struct rpc_task *task);
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void (*set_retrans_timeout)(struct rpc_task *task);
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void (*timer)(struct rpc_xprt *xprt, struct rpc_task *task);
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void (*release_request)(struct rpc_task *task);
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void (*close)(struct rpc_xprt *xprt);
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void (*destroy)(struct rpc_xprt *xprt);
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void (*print_stats)(struct rpc_xprt *xprt, struct seq_file *seq);
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};
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/*
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* RPC transport identifiers
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*
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* To preserve compatibility with the historical use of raw IP protocol
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* id's for transport selection, UDP and TCP identifiers are specified
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* with the previous values. No such restriction exists for new transports,
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* except that they may not collide with these values (17 and 6,
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* respectively).
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*/
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#define XPRT_TRANSPORT_BC (1 << 31)
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enum xprt_transports {
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XPRT_TRANSPORT_UDP = IPPROTO_UDP,
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XPRT_TRANSPORT_TCP = IPPROTO_TCP,
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XPRT_TRANSPORT_BC_TCP = IPPROTO_TCP | XPRT_TRANSPORT_BC,
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XPRT_TRANSPORT_RDMA = 256,
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XPRT_TRANSPORT_LOCAL = 257,
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};
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struct rpc_xprt {
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atomic_t count; /* Reference count */
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struct rpc_xprt_ops * ops; /* transport methods */
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const struct rpc_timeout *timeout; /* timeout parms */
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struct sockaddr_storage addr; /* server address */
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size_t addrlen; /* size of server address */
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int prot; /* IP protocol */
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unsigned long cong; /* current congestion */
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unsigned long cwnd; /* congestion window */
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size_t max_payload; /* largest RPC payload size,
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in bytes */
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unsigned int tsh_size; /* size of transport specific
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header */
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struct rpc_wait_queue binding; /* requests waiting on rpcbind */
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struct rpc_wait_queue sending; /* requests waiting to send */
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struct rpc_wait_queue pending; /* requests in flight */
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struct rpc_wait_queue backlog; /* waiting for slot */
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struct list_head free; /* free slots */
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unsigned int max_reqs; /* max number of slots */
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unsigned int min_reqs; /* min number of slots */
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atomic_t num_reqs; /* total slots */
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unsigned long state; /* transport state */
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unsigned char resvport : 1; /* use a reserved port */
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unsigned int swapper; /* we're swapping over this
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transport */
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unsigned int bind_index; /* bind function index */
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/*
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* Connection of transports
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*/
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unsigned long bind_timeout,
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reestablish_timeout;
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unsigned int connect_cookie; /* A cookie that gets bumped
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every time the transport
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is reconnected */
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/*
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* Disconnection of idle transports
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*/
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struct work_struct task_cleanup;
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struct timer_list timer;
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unsigned long last_used,
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idle_timeout;
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/*
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* Send stuff
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*/
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spinlock_t transport_lock; /* lock transport info */
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spinlock_t reserve_lock; /* lock slot table */
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u32 xid; /* Next XID value to use */
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struct rpc_task * snd_task; /* Task blocked in send */
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struct svc_xprt *bc_xprt; /* NFSv4.1 backchannel */
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#if defined(CONFIG_SUNRPC_BACKCHANNEL)
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struct svc_serv *bc_serv; /* The RPC service which will */
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/* process the callback */
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unsigned int bc_alloc_count; /* Total number of preallocs */
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spinlock_t bc_pa_lock; /* Protects the preallocated
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* items */
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struct list_head bc_pa_list; /* List of preallocated
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* backchannel rpc_rqst's */
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#endif /* CONFIG_SUNRPC_BACKCHANNEL */
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struct list_head recv;
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struct {
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unsigned long bind_count, /* total number of binds */
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connect_count, /* total number of connects */
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connect_start, /* connect start timestamp */
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connect_time, /* jiffies waiting for connect */
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sends, /* how many complete requests */
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recvs, /* how many complete requests */
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bad_xids, /* lookup_rqst didn't find XID */
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max_slots; /* max rpc_slots used */
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unsigned long long req_u, /* average requests on the wire */
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bklog_u, /* backlog queue utilization */
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sending_u, /* send q utilization */
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pending_u; /* pend q utilization */
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} stat;
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struct net *xprt_net;
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const char *servername;
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const char *address_strings[RPC_DISPLAY_MAX];
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#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
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struct dentry *debugfs; /* debugfs directory */
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#endif
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};
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#if defined(CONFIG_SUNRPC_BACKCHANNEL)
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/*
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* Backchannel flags
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*/
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#define RPC_BC_PA_IN_USE 0x0001 /* Preallocated backchannel */
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/* buffer in use */
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#endif /* CONFIG_SUNRPC_BACKCHANNEL */
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#if defined(CONFIG_SUNRPC_BACKCHANNEL)
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static inline int bc_prealloc(struct rpc_rqst *req)
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{
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return test_bit(RPC_BC_PA_IN_USE, &req->rq_bc_pa_state);
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}
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#else
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static inline int bc_prealloc(struct rpc_rqst *req)
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{
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return 0;
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}
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#endif /* CONFIG_SUNRPC_BACKCHANNEL */
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#define XPRT_CREATE_INFINITE_SLOTS (1U)
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#define XPRT_CREATE_NO_IDLE_TIMEOUT (1U << 1)
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struct xprt_create {
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int ident; /* XPRT_TRANSPORT identifier */
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struct net * net;
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struct sockaddr * srcaddr; /* optional local address */
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struct sockaddr * dstaddr; /* remote peer address */
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size_t addrlen;
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const char *servername;
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struct svc_xprt *bc_xprt; /* NFSv4.1 backchannel */
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unsigned int flags;
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};
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struct xprt_class {
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struct list_head list;
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int ident; /* XPRT_TRANSPORT identifier */
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struct rpc_xprt * (*setup)(struct xprt_create *);
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struct module *owner;
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char name[32];
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};
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/*
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* Generic internal transport functions
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*/
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struct rpc_xprt *xprt_create_transport(struct xprt_create *args);
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void xprt_connect(struct rpc_task *task);
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void xprt_reserve(struct rpc_task *task);
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void xprt_retry_reserve(struct rpc_task *task);
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int xprt_reserve_xprt(struct rpc_xprt *xprt, struct rpc_task *task);
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int xprt_reserve_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task);
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void xprt_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task);
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void xprt_lock_and_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task);
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bool xprt_prepare_transmit(struct rpc_task *task);
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void xprt_transmit(struct rpc_task *task);
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void xprt_end_transmit(struct rpc_task *task);
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int xprt_adjust_timeout(struct rpc_rqst *req);
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void xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task);
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void xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task);
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void xprt_release(struct rpc_task *task);
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void xprt_put(struct rpc_xprt *xprt);
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struct rpc_xprt * xprt_alloc(struct net *net, size_t size,
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unsigned int num_prealloc,
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unsigned int max_req);
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void xprt_free(struct rpc_xprt *);
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/**
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* xprt_get - return a reference to an RPC transport.
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* @xprt: pointer to the transport
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*
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*/
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static inline struct rpc_xprt *xprt_get(struct rpc_xprt *xprt)
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{
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if (atomic_inc_not_zero(&xprt->count))
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return xprt;
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return NULL;
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}
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static inline __be32 *xprt_skip_transport_header(struct rpc_xprt *xprt, __be32 *p)
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{
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return p + xprt->tsh_size;
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}
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/*
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* Transport switch helper functions
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*/
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int xprt_register_transport(struct xprt_class *type);
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int xprt_unregister_transport(struct xprt_class *type);
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int xprt_load_transport(const char *);
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void xprt_set_retrans_timeout_def(struct rpc_task *task);
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void xprt_set_retrans_timeout_rtt(struct rpc_task *task);
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void xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status);
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void xprt_wait_for_buffer_space(struct rpc_task *task, rpc_action action);
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void xprt_write_space(struct rpc_xprt *xprt);
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void xprt_adjust_cwnd(struct rpc_xprt *xprt, struct rpc_task *task, int result);
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struct rpc_rqst * xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid);
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void xprt_complete_rqst(struct rpc_task *task, int copied);
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void xprt_release_rqst_cong(struct rpc_task *task);
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void xprt_disconnect_done(struct rpc_xprt *xprt);
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void xprt_force_disconnect(struct rpc_xprt *xprt);
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void xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie);
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int xs_swapper(struct rpc_xprt *xprt, int enable);
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bool xprt_lock_connect(struct rpc_xprt *, struct rpc_task *, void *);
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void xprt_unlock_connect(struct rpc_xprt *, void *);
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/*
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* Reserved bit positions in xprt->state
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*/
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#define XPRT_LOCKED (0)
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#define XPRT_CONNECTED (1)
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#define XPRT_CONNECTING (2)
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#define XPRT_CLOSE_WAIT (3)
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#define XPRT_BOUND (4)
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#define XPRT_BINDING (5)
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#define XPRT_CLOSING (6)
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#define XPRT_CONGESTED (9)
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static inline void xprt_set_connected(struct rpc_xprt *xprt)
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{
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set_bit(XPRT_CONNECTED, &xprt->state);
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}
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static inline void xprt_clear_connected(struct rpc_xprt *xprt)
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{
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clear_bit(XPRT_CONNECTED, &xprt->state);
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}
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static inline int xprt_connected(struct rpc_xprt *xprt)
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{
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return test_bit(XPRT_CONNECTED, &xprt->state);
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}
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static inline int xprt_test_and_set_connected(struct rpc_xprt *xprt)
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{
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return test_and_set_bit(XPRT_CONNECTED, &xprt->state);
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}
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static inline int xprt_test_and_clear_connected(struct rpc_xprt *xprt)
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{
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return test_and_clear_bit(XPRT_CONNECTED, &xprt->state);
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}
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static inline void xprt_clear_connecting(struct rpc_xprt *xprt)
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{
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smp_mb__before_atomic();
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clear_bit(XPRT_CONNECTING, &xprt->state);
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smp_mb__after_atomic();
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}
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static inline int xprt_connecting(struct rpc_xprt *xprt)
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{
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return test_bit(XPRT_CONNECTING, &xprt->state);
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}
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static inline int xprt_test_and_set_connecting(struct rpc_xprt *xprt)
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{
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return test_and_set_bit(XPRT_CONNECTING, &xprt->state);
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}
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static inline void xprt_set_bound(struct rpc_xprt *xprt)
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{
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test_and_set_bit(XPRT_BOUND, &xprt->state);
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}
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static inline int xprt_bound(struct rpc_xprt *xprt)
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{
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return test_bit(XPRT_BOUND, &xprt->state);
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}
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static inline void xprt_clear_bound(struct rpc_xprt *xprt)
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{
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clear_bit(XPRT_BOUND, &xprt->state);
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}
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static inline void xprt_clear_binding(struct rpc_xprt *xprt)
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{
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smp_mb__before_atomic();
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clear_bit(XPRT_BINDING, &xprt->state);
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smp_mb__after_atomic();
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}
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static inline int xprt_test_and_set_binding(struct rpc_xprt *xprt)
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{
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return test_and_set_bit(XPRT_BINDING, &xprt->state);
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}
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#endif /* __KERNEL__*/
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#endif /* _LINUX_SUNRPC_XPRT_H */
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