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1 | /* message.h: Rx message caching |
2 | * | |
3 | * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #ifndef _LINUX_RXRPC_MESSAGE_H | |
13 | #define _LINUX_RXRPC_MESSAGE_H | |
14 | ||
15 | #include <rxrpc/packet.h> | |
16 | ||
17 | /*****************************************************************************/ | |
18 | /* | |
19 | * Rx message record | |
20 | */ | |
21 | struct rxrpc_message | |
22 | { | |
23 | atomic_t usage; | |
24 | struct list_head link; /* list link */ | |
25 | struct timeval stamp; /* time received or last sent */ | |
26 | rxrpc_seq_t seq; /* message sequence number */ | |
27 | ||
28 | int state; /* the state the message is currently in */ | |
29 | #define RXRPC_MSG_PREPARED 0 | |
30 | #define RXRPC_MSG_SENT 1 | |
31 | #define RXRPC_MSG_ACKED 2 /* provisionally ACK'd */ | |
32 | #define RXRPC_MSG_DONE 3 /* definitively ACK'd (msg->seq<ack.firstPacket) */ | |
33 | #define RXRPC_MSG_RECEIVED 4 | |
34 | #define RXRPC_MSG_ERROR -1 | |
35 | char rttdone; /* used for RTT */ | |
36 | ||
37 | struct rxrpc_transport *trans; /* transport received through */ | |
38 | struct rxrpc_connection *conn; /* connection received over */ | |
39 | struct sk_buff *pkt; /* received packet */ | |
40 | off_t offset; /* offset into pkt of next byte of data */ | |
41 | ||
42 | struct rxrpc_header hdr; /* message header */ | |
43 | ||
44 | int dcount; /* data part count */ | |
45 | size_t dsize; /* data size */ | |
46 | #define RXRPC_MSG_MAX_IOCS 8 | |
47 | struct kvec data[RXRPC_MSG_MAX_IOCS]; /* message data */ | |
48 | unsigned long dfree; /* bit mask indicating kfree(data[x]) if T */ | |
49 | }; | |
50 | ||
51 | #define rxrpc_get_message(M) do { atomic_inc(&(M)->usage); } while(0) | |
52 | ||
53 | extern void __rxrpc_put_message(struct rxrpc_message *msg); | |
54 | static inline void rxrpc_put_message(struct rxrpc_message *msg) | |
55 | { | |
56 | BUG_ON(atomic_read(&msg->usage)<=0); | |
57 | if (atomic_dec_and_test(&msg->usage)) | |
58 | __rxrpc_put_message(msg); | |
59 | } | |
60 | ||
61 | extern int rxrpc_conn_newmsg(struct rxrpc_connection *conn, | |
62 | struct rxrpc_call *call, | |
63 | uint8_t type, | |
64 | int count, | |
65 | struct kvec *diov, | |
dd0fc66f | 66 | gfp_t alloc_flags, |
1da177e4 LT |
67 | struct rxrpc_message **_msg); |
68 | ||
69 | extern int rxrpc_conn_sendmsg(struct rxrpc_connection *conn, struct rxrpc_message *msg); | |
70 | ||
71 | #endif /* _LINUX_RXRPC_MESSAGE_H */ |