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tipc: Message rejection rework preparatory changes

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This patch defines a few new message header manipulation routines,
and generalizes the usefulness of another, in preparation for upcoming
rework of TIPC's message rejection code.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Allan Stephens
2008-06-04 17:54:48 -07:00
committed by David S. Miller
parent 99c145939b
commit 40aecb1b13
3 changed files with 31 additions and 4 deletions
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31
net/tipc/msg.h
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@@ -75,6 +75,14 @@ static inline void msg_set_bits(struct tipc_msg *m, u32 w,
m->hdr[w] |= htonl(val);
}
static inline void msg_swap_words(struct tipc_msg *msg, u32 a, u32 b)
{
u32 temp = msg->hdr[a];
msg->hdr[a] = msg->hdr[b];
msg->hdr[b] = temp;
}
/*
* Word 0
*/
@@ -119,9 +127,9 @@ static inline int msg_non_seq(struct tipc_msg *m)
return msg_bits(m, 0, 20, 1);
}
static inline void msg_set_non_seq(struct tipc_msg *m)
static inline void msg_set_non_seq(struct tipc_msg *m, u32 n)
{
msg_set_bits(m, 0, 20, 1, 1);
msg_set_bits(m, 0, 20, 1, n);
}
static inline int msg_dest_droppable(struct tipc_msg *m)
@@ -224,6 +232,25 @@ static inline void msg_set_seqno(struct tipc_msg *m, u32 n)
msg_set_bits(m, 2, 0, 0xffff, n);
}
/*
* TIPC may utilize the "link ack #" and "link seq #" fields of a short
* message header to hold the destination node for the message, since the
* normal "dest node" field isn't present. This cache is only referenced
* when required, so populating the cache of a longer message header is
* harmless (as long as the header has the two link sequence fields present).
*
* Note: Host byte order is OK here, since the info never goes off-card.
*/
static inline u32 msg_destnode_cache(struct tipc_msg *m)
{
return m->hdr[2];
}
static inline void msg_set_destnode_cache(struct tipc_msg *m, u32 dnode)
{
m->hdr[2] = dnode;
}
/*
* Words 3-10