/* * linux/include/linux/sunrpc/clnt_xprt.h * * Declarations for the RPC transport interface. * * Copyright (C) 1995, 1996 Olaf Kirch */ #ifndef _LINUX_SUNRPC_XPRT_H #define _LINUX_SUNRPC_XPRT_H #include #include #include #include #include /* * The transport code maintains an estimate on the maximum number of out- * standing RPC requests, using a smoothed version of the congestion * avoidance implemented in 44BSD. This is basically the Van Jacobson * congestion algorithm: If a retransmit occurs, the congestion window is * halved; otherwise, it is incremented by 1/cwnd when * * - a reply is received and * - a full number of requests are outstanding and * - the congestion window hasn't been updated recently. * * Upper procedures may check whether a request would block waiting for * a free RPC slot by using the RPC_CONGESTED() macro. * * Note: on machines with low memory we should probably use a smaller * MAXREQS value: At 32 outstanding reqs with 8 megs of RAM, fragment * reassembly will frequently run out of memory. */ #define RPC_MAXCONG (16) #define RPC_MAXREQS RPC_MAXCONG #define RPC_CWNDSCALE (256) #define RPC_MAXCWND (RPC_MAXCONG * RPC_CWNDSCALE) #define RPC_INITCWND RPC_CWNDSCALE #define RPCXPRT_CONGESTED(xprt) ((xprt)->cong >= (xprt)->cwnd) /* Default timeout values */ #define RPC_MAX_UDP_TIMEOUT (60*HZ) #define RPC_MAX_TCP_TIMEOUT (600*HZ) /* * * Wait duration for an RPC TCP connection to be established. Solaris * * NFS over TCP uses 60 seconds, for example, which is in line with how * * long a server takes to reboot. * */ #define RPC_CONNECT_TIMEOUT (60*HZ) /* * * Delay an arbitrary number of seconds before attempting to reconnect * * after an error. * */ #define RPC_REESTABLISH_TIMEOUT (15*HZ) /* RPC call and reply header size as number of 32bit words (verifier * size computed separately) */ #define RPC_CALLHDRSIZE 6 #define RPC_REPHDRSIZE 4 /* * This describes a timeout strategy */ struct rpc_timeout { unsigned long to_current, /* current timeout */ to_initval, /* initial timeout */ to_maxval, /* max timeout */ to_increment; /* if !exponential */ short to_retries; /* max # of retries */ unsigned char to_exponential; }; /* * This describes a complete RPC request */ struct rpc_rqst { /* * This is the user-visible part */ struct rpc_xprt * rq_xprt; /* RPC client */ struct rpc_timeout rq_timeout; /* timeout parms */ 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 */ __u32 rq_xid; /* request XID */ struct rpc_rqst * rq_next; /* free list */ int rq_cong; /* has incremented xprt->cong */ int rq_received; /* receive completed */ struct list_head rq_list; struct xdr_buf rq_private_buf; /* The receive buffer * used in the softirq. */ /* * For authentication (e.g. auth_des) */ u32 rq_creddata[2]; /* * Partial send handling */ u32 rq_bytes_sent; /* Bytes we have sent */ long rq_xtime; /* when transmitted */ int rq_ntimeo; int rq_ntrans; }; #define rq_svec rq_snd_buf.head #define rq_slen rq_snd_buf.len #define rq_rvec rq_rcv_buf.head #define rq_rlen rq_rcv_buf.len #define XPRT_LAST_FRAG (1 << 0) #define XPRT_COPY_RECM (1 << 1) #define XPRT_COPY_XID (1 << 2) #define XPRT_COPY_DATA (1 << 3) struct rpc_xprt { struct socket * sock; /* BSD socket layer */ struct sock * inet; /* INET layer */ struct rpc_timeout timeout; /* timeout parms */ struct sockaddr_in addr; /* server address */ int prot; /* IP protocol */ unsigned long cong; /* current congestion */ unsigned long cwnd; /* congestion window */ unsigned int rcvsize, /* socket receive buffer size */ sndsize; /* socket send buffer size */ struct rpc_wait_queue sending; /* requests waiting to send */ struct rpc_wait_queue resend; /* requests waiting to resend */ struct rpc_wait_queue pending; /* requests in flight */ struct rpc_wait_queue backlog; /* waiting for slot */ struct rpc_rqst * free; /* free slots */ struct rpc_rqst slot[RPC_MAXREQS]; unsigned long sockstate; /* Socket state */ unsigned char shutdown : 1, /* being shut down */ nocong : 1, /* no congestion control */ resvport : 1, /* use a reserved port */ stream : 1; /* TCP */ /* * State of TCP reply receive stuff */ u32 tcp_recm, /* Fragment header */ tcp_xid, /* Current XID */ tcp_reclen, /* fragment length */ tcp_offset; /* fragment offset */ unsigned long tcp_copied, /* copied to request */ tcp_flags; /* * Send stuff */ spinlock_t sock_lock; /* lock socket info */ spinlock_t xprt_lock; /* lock xprt info */ struct rpc_task * snd_task; /* Task blocked in send */ struct list_head recv; void (*old_data_ready)(struct sock *, int); void (*old_state_change)(struct sock *); void (*old_write_space)(struct sock *); wait_queue_head_t cong_wait; }; #ifdef __KERNEL__ struct rpc_xprt * xprt_create_proto(int proto, struct sockaddr_in *addr, struct rpc_timeout *toparms); int xprt_destroy(struct rpc_xprt *); void xprt_shutdown(struct rpc_xprt *); void xprt_default_timeout(struct rpc_timeout *, int); void xprt_set_timeout(struct rpc_timeout *, unsigned int, unsigned long); void xprt_reserve(struct rpc_task *); void xprt_transmit(struct rpc_task *); void xprt_receive(struct rpc_task *); int xprt_adjust_timeout(struct rpc_timeout *); void xprt_release(struct rpc_task *); void xprt_connect(struct rpc_task *); int xprt_clear_backlog(struct rpc_xprt *); void xprt_sock_setbufsize(struct rpc_xprt *); #define XPRT_CONNECT 0 #define xprt_connected(xp) (test_bit(XPRT_CONNECT, &(xp)->sockstate)) #define xprt_set_connected(xp) (set_bit(XPRT_CONNECT, &(xp)->sockstate)) #define xprt_test_and_set_connected(xp) (test_and_set_bit(XPRT_CONNECT, &(xp)->sockstate)) #define xprt_clear_connected(xp) (clear_bit(XPRT_CONNECT, &(xp)->sockstate)) #endif /* __KERNEL__*/ #endif /* _LINUX_SUNRPC_XPRT_H */