| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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, |
| 66 | int alloc_flags, |
| 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 */ |