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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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2
net/tipc/bcast.c
View file

@ -571,7 +571,7 @@ static int tipc_bcbearer_send(struct sk_buff *buf,
assert(tipc_cltr_bcast_nodes.count != 0);
bcbuf_set_acks(buf, tipc_cltr_bcast_nodes.count);
msg = buf_msg(buf);
msg_set_non_seq(msg);
msg_set_non_seq(msg, 1);
msg_set_mc_netid(msg, tipc_net_id);
}

2
net/tipc/discover.c
View file

@ -121,7 +121,7 @@ static struct sk_buff *tipc_disc_init_msg(u32 type,
if (buf) {
msg = buf_msg(buf);
msg_init(msg, LINK_CONFIG, type, DSC_H_SIZE, dest_domain);
msg_set_non_seq(msg);
msg_set_non_seq(msg, 1);
msg_set_req_links(msg, req_links);
msg_set_dest_domain(msg, dest_domain);
msg_set_bc_netid(msg, tipc_net_id);

31
net/tipc/msg.h
View file

@ -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