kernel-ark/include/rxrpc/call.h
Al Viro dd0fc66fb3 [PATCH] gfp flags annotations - part 1
- added typedef unsigned int __nocast gfp_t;

 - replaced __nocast uses for gfp flags with gfp_t - it gives exactly
   the same warnings as far as sparse is concerned, doesn't change
   generated code (from gcc point of view we replaced unsigned int with
   typedef) and documents what's going on far better.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-08 15:00:57 -07:00

213 lines
8.6 KiB
C

/* call.h: Rx call record
*
* Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#ifndef _LINUX_RXRPC_CALL_H
#define _LINUX_RXRPC_CALL_H
#include <rxrpc/types.h>
#include <rxrpc/rxrpc.h>
#include <rxrpc/packet.h>
#include <linux/timer.h>
#define RXRPC_CALL_ACK_WINDOW_SIZE 16
extern unsigned rxrpc_call_rcv_timeout; /* receive activity timeout (secs) */
/* application call state
* - only state 0 and ffff are reserved, the state is set to 1 after an opid is received
*/
enum rxrpc_app_cstate {
RXRPC_CSTATE_COMPLETE = 0, /* operation complete */
RXRPC_CSTATE_ERROR, /* operation ICMP error or aborted */
RXRPC_CSTATE_SRVR_RCV_OPID, /* [SERVER] receiving operation ID */
RXRPC_CSTATE_SRVR_RCV_ARGS, /* [SERVER] receiving operation data */
RXRPC_CSTATE_SRVR_GOT_ARGS, /* [SERVER] completely received operation data */
RXRPC_CSTATE_SRVR_SND_REPLY, /* [SERVER] sending operation reply */
RXRPC_CSTATE_SRVR_RCV_FINAL_ACK, /* [SERVER] receiving final ACK */
RXRPC_CSTATE_CLNT_SND_ARGS, /* [CLIENT] sending operation args */
RXRPC_CSTATE_CLNT_RCV_REPLY, /* [CLIENT] receiving operation reply */
RXRPC_CSTATE_CLNT_GOT_REPLY, /* [CLIENT] completely received operation reply */
} __attribute__((packed));
extern const char *rxrpc_call_states[];
enum rxrpc_app_estate {
RXRPC_ESTATE_NO_ERROR = 0, /* no error */
RXRPC_ESTATE_LOCAL_ABORT, /* aborted locally by application layer */
RXRPC_ESTATE_PEER_ABORT, /* aborted remotely by peer */
RXRPC_ESTATE_LOCAL_ERROR, /* local ICMP network error */
RXRPC_ESTATE_REMOTE_ERROR, /* remote ICMP network error */
} __attribute__((packed));
extern const char *rxrpc_call_error_states[];
/*****************************************************************************/
/*
* Rx call record and application scratch buffer
* - the call record occupies the bottom of a complete page
* - the application scratch buffer occupies the rest
*/
struct rxrpc_call
{
atomic_t usage;
struct rxrpc_connection *conn; /* connection upon which active */
spinlock_t lock; /* access lock */
struct module *owner; /* owner module */
wait_queue_head_t waitq; /* wait queue for events to happen */
struct list_head link; /* general internal list link */
struct list_head call_link; /* master call list link */
__be32 chan_ix; /* connection channel index */
__be32 call_id; /* call ID on connection */
unsigned long cjif; /* jiffies at call creation */
unsigned long flags; /* control flags */
#define RXRPC_CALL_ACKS_TIMO 0x00000001 /* ACKS timeout reached */
#define RXRPC_CALL_ACKR_TIMO 0x00000002 /* ACKR timeout reached */
#define RXRPC_CALL_RCV_TIMO 0x00000004 /* RCV timeout reached */
#define RXRPC_CALL_RCV_PKT 0x00000008 /* received packet */
/* transmission */
rxrpc_seq_t snd_seq_count; /* outgoing packet sequence number counter */
struct rxrpc_message *snd_nextmsg; /* next message being constructed for sending */
struct rxrpc_message *snd_ping; /* last ping message sent */
unsigned short snd_resend_cnt; /* count of resends since last ACK */
/* transmission ACK tracking */
struct list_head acks_pendq; /* messages pending ACK (ordered by seq) */
unsigned acks_pend_cnt; /* number of un-ACK'd packets */
rxrpc_seq_t acks_dftv_seq; /* highest definitively ACK'd msg seq */
struct timer_list acks_timeout; /* timeout on expected ACK */
/* reception */
struct list_head rcv_receiveq; /* messages pending reception (ordered by seq) */
struct list_head rcv_krxiodq_lk; /* krxiod queue for new inbound packets */
struct timer_list rcv_timeout; /* call receive activity timeout */
/* reception ACK'ing */
rxrpc_seq_t ackr_win_bot; /* bottom of ACK window */
rxrpc_seq_t ackr_win_top; /* top of ACK window */
rxrpc_seq_t ackr_high_seq; /* highest seqno yet received */
rxrpc_seq_net_t ackr_prev_seq; /* previous seqno received */
unsigned ackr_pend_cnt; /* number of pending ACKs */
struct timer_list ackr_dfr_timo; /* timeout on deferred ACK */
char ackr_dfr_perm; /* request for deferred ACKs permitted */
rxrpc_seq_t ackr_dfr_seq; /* seqno for deferred ACK */
struct rxrpc_ackpacket ackr; /* pending normal ACK packet */
uint8_t ackr_array[RXRPC_CALL_ACK_WINDOW_SIZE]; /* ACK records */
/* presentation layer */
char app_last_rcv; /* T if received last packet from remote end */
enum rxrpc_app_cstate app_call_state; /* call state */
enum rxrpc_app_estate app_err_state; /* abort/error state */
struct list_head app_readyq; /* ordered ready received packet queue */
struct list_head app_unreadyq; /* ordered post-hole recv'd packet queue */
rxrpc_seq_t app_ready_seq; /* last seq number dropped into readyq */
size_t app_ready_qty; /* amount of data ready in readyq */
unsigned app_opcode; /* operation ID */
unsigned app_abort_code; /* abort code (when aborted) */
int app_errno; /* error number (when ICMP error received) */
/* statisics */
unsigned pkt_rcv_count; /* count of received packets on this call */
unsigned pkt_snd_count; /* count of sent packets on this call */
unsigned app_read_count; /* number of reads issued */
/* bits for the application to use */
rxrpc_call_attn_func_t app_attn_func; /* callback when attention required */
rxrpc_call_error_func_t app_error_func; /* callback when abort sent (cleanup and put) */
rxrpc_call_aemap_func_t app_aemap_func; /* callback to map abort code to/from errno */
void *app_user; /* application data */
struct list_head app_link; /* application list linkage */
struct list_head app_attn_link; /* application attention list linkage */
size_t app_mark; /* trigger callback when app_ready_qty>=app_mark */
char app_async_read; /* T if in async-read mode */
uint8_t *app_read_buf; /* application async read buffer (app_mark size) */
uint8_t *app_scr_alloc; /* application scratch allocation pointer */
void *app_scr_ptr; /* application pointer into scratch buffer */
#define RXRPC_APP_MARK_EOF 0xFFFFFFFFU /* mark at end of input */
/* application scratch buffer */
uint8_t app_scratch[0] __attribute__((aligned(sizeof(long))));
};
#define RXRPC_CALL_SCRATCH_SIZE (PAGE_SIZE - sizeof(struct rxrpc_call))
#define rxrpc_call_reset_scratch(CALL) \
do { (CALL)->app_scr_alloc = (CALL)->app_scratch; } while(0)
#define rxrpc_call_alloc_scratch(CALL,SIZE) \
({ \
void *ptr; \
ptr = (CALL)->app_scr_alloc; \
(CALL)->app_scr_alloc += (SIZE); \
if ((SIZE)>RXRPC_CALL_SCRATCH_SIZE || \
(size_t)((CALL)->app_scr_alloc - (u8*)(CALL)) > RXRPC_CALL_SCRATCH_SIZE) { \
printk("rxrpc_call_alloc_scratch(%p,%Zu)\n",(CALL),(size_t)(SIZE)); \
BUG(); \
} \
ptr; \
})
#define rxrpc_call_alloc_scratch_s(CALL,TYPE) \
({ \
size_t size = sizeof(TYPE); \
TYPE *ptr; \
ptr = (TYPE*)(CALL)->app_scr_alloc; \
(CALL)->app_scr_alloc += size; \
if (size>RXRPC_CALL_SCRATCH_SIZE || \
(size_t)((CALL)->app_scr_alloc - (u8*)(CALL)) > RXRPC_CALL_SCRATCH_SIZE) { \
printk("rxrpc_call_alloc_scratch(%p,%Zu)\n",(CALL),size); \
BUG(); \
} \
ptr; \
})
#define rxrpc_call_is_ack_pending(CALL) ((CALL)->ackr.reason != 0)
extern int rxrpc_create_call(struct rxrpc_connection *conn,
rxrpc_call_attn_func_t attn,
rxrpc_call_error_func_t error,
rxrpc_call_aemap_func_t aemap,
struct rxrpc_call **_call);
extern int rxrpc_incoming_call(struct rxrpc_connection *conn,
struct rxrpc_message *msg,
struct rxrpc_call **_call);
static inline void rxrpc_get_call(struct rxrpc_call *call)
{
BUG_ON(atomic_read(&call->usage)<=0);
atomic_inc(&call->usage);
/*printk("rxrpc_get_call(%p{u=%d})\n",(C),atomic_read(&(C)->usage));*/
}
extern void rxrpc_put_call(struct rxrpc_call *call);
extern void rxrpc_call_do_stuff(struct rxrpc_call *call);
extern int rxrpc_call_abort(struct rxrpc_call *call, int error);
#define RXRPC_CALL_READ_BLOCK 0x0001 /* block if not enough data and not yet EOF */
#define RXRPC_CALL_READ_ALL 0x0002 /* error if insufficient data received */
extern int rxrpc_call_read_data(struct rxrpc_call *call, void *buffer, size_t size, int flags);
extern int rxrpc_call_write_data(struct rxrpc_call *call,
size_t sioc,
struct kvec *siov,
uint8_t rxhdr_flags,
gfp_t alloc_flags,
int dup_data,
size_t *size_sent);
extern void rxrpc_call_handle_error(struct rxrpc_call *conn, int local, int errno);
#endif /* _LINUX_RXRPC_CALL_H */