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316 lines
9.0 KiB
316 lines
9.0 KiB
/*
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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/sunrpc/sched.h>
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#include <linux/sunrpc/xdr.h>
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extern unsigned int xprt_udp_slot_table_entries;
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extern unsigned int xprt_tcp_slot_table_entries;
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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 (128U)
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/*
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* RPC call and reply header size as number of 32bit words (verifier
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* size computed separately)
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*/
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#define RPC_CALLHDRSIZE 6
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#define RPC_REPHDRSIZE 4
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/*
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* Parameters for choosing a free port
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*/
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extern unsigned int xprt_min_resvport;
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extern unsigned int xprt_max_resvport;
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#define RPC_MIN_RESVPORT (1U)
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#define RPC_MAX_RESVPORT (65535U)
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#define RPC_DEF_MIN_RESVPORT (650U)
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#define RPC_DEF_MAX_RESVPORT (1023U)
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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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struct rpc_task;
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struct rpc_xprt;
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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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__u32 rq_xid; /* request XID */
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int rq_cong; /* has incremented xprt->cong */
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int rq_received; /* receive completed */
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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_bufsize;
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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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unsigned int rq_retries; /* # of retries */
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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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unsigned long rq_xtime; /* when transmitted */
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int rq_ntrans;
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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_task *task);
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void (*release_xprt)(struct rpc_xprt *xprt, 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_task *task);
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void * (*buf_alloc)(struct rpc_task *task, size_t size);
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void (*buf_free)(struct rpc_task *task);
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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_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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struct rpc_xprt {
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struct rpc_xprt_ops * ops; /* transport methods */
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struct socket * sock; /* BSD socket layer */
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struct sock * inet; /* INET layer */
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struct rpc_timeout timeout; /* timeout parms */
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struct sockaddr_in addr; /* 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 rcvsize, /* transport rcv buffer size */
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sndsize; /* transport send buffer size */
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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 sending; /* requests waiting to send */
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struct rpc_wait_queue resend; /* requests waiting to resend */
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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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struct rpc_rqst * slot; /* slot table storage */
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unsigned int max_reqs; /* total slots */
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unsigned long state; /* transport state */
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unsigned char shutdown : 1, /* being shut down */
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resvport : 1; /* use a reserved port */
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/*
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* XID
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*/
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__u32 xid; /* Next XID value to use */
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/*
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* State of TCP reply receive stuff
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*/
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u32 tcp_recm, /* Fragment header */
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tcp_xid, /* Current XID */
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tcp_reclen, /* fragment length */
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tcp_offset; /* fragment offset */
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unsigned long tcp_copied, /* copied to request */
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tcp_flags;
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/*
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* Connection of transports
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*/
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unsigned long connect_timeout,
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bind_timeout,
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reestablish_timeout;
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struct work_struct connect_worker;
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unsigned short port;
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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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struct rpc_task * snd_task; /* Task blocked in send */
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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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unsigned long long req_u, /* average requests on the wire */
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bklog_u; /* backlog queue utilization */
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} stat;
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void (*old_data_ready)(struct sock *, int);
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void (*old_state_change)(struct sock *);
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void (*old_write_space)(struct sock *);
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};
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#define XPRT_LAST_FRAG (1 << 0)
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#define XPRT_COPY_RECM (1 << 1)
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#define XPRT_COPY_XID (1 << 2)
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#define XPRT_COPY_DATA (1 << 3)
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#ifdef __KERNEL__
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/*
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* Transport operations used by ULPs
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*/
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struct rpc_xprt * xprt_create_proto(int proto, struct sockaddr_in *addr, struct rpc_timeout *to);
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void xprt_set_timeout(struct rpc_timeout *to, unsigned int retr, unsigned long incr);
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/*
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* Generic internal transport functions
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*/
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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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int xprt_reserve_xprt(struct rpc_task *task);
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int xprt_reserve_xprt_cong(struct rpc_task *task);
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int xprt_prepare_transmit(struct rpc_task *task);
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void xprt_transmit(struct rpc_task *task);
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void xprt_abort_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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int xprt_destroy(struct rpc_xprt *xprt);
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static inline u32 *xprt_skip_transport_header(struct rpc_xprt *xprt, u32 *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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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);
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void xprt_write_space(struct rpc_xprt *xprt);
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void xprt_update_rtt(struct rpc_task *task);
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void xprt_adjust_cwnd(struct rpc_task *task, int result);
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struct rpc_rqst * xprt_lookup_rqst(struct rpc_xprt *xprt, u32 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(struct rpc_xprt *xprt);
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/*
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* Socket transport setup operations
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*/
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int xs_setup_udp(struct rpc_xprt *xprt, struct rpc_timeout *to);
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int xs_setup_tcp(struct rpc_xprt *xprt, struct rpc_timeout *to);
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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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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_clear_bit();
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clear_bit(XPRT_CONNECTING, &xprt->state);
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smp_mb__after_clear_bit();
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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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#endif /* __KERNEL__*/
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#endif /* _LINUX_SUNRPC_XPRT_H */
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