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authorAllan Stephens <allan.stephens@windriver.com>2008-06-04 17:54:48 -0700
committerDavid S. Miller <davem@davemloft.net>2008-06-04 17:54:48 -0700
commit40aecb1b13f50d96616abb612c17e59457f54263 (patch)
tree1c73be75d3bdcda30d2f90d5189bd57920188802
parent99c145939bc1f65f9b946f2b9dd7bfc1f44783d6 (diff)
tipc: Message rejection rework preparatory changes
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>
-rw-r--r--net/tipc/bcast.c2
-rw-r--r--net/tipc/discover.c2
-rw-r--r--net/tipc/msg.h31
3 files changed, 31 insertions, 4 deletions
diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c
index 0052c0747d0..a5883b1452f 100644
--- a/net/tipc/bcast.c
+++ b/net/tipc/bcast.c
@@ -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);
}
diff --git a/net/tipc/discover.c b/net/tipc/discover.c
index 64c20284e0f..1657f0e795f 100644
--- a/net/tipc/discover.c
+++ b/net/tipc/discover.c
@@ -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);
diff --git a/net/tipc/msg.h b/net/tipc/msg.h
index b23619fab96..7ee6ae23814 100644
--- a/net/tipc/msg.h
+++ b/net/tipc/msg.h
@@ -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