include/rxrpc/message.h

   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                              gfp_t 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 */