tipc: Avoid recomputation of outgoing message length

Rework TIPC's message sending routines to take advantage of the total
amount of data value passed to it by the kernel socket infrastructure.
This change eliminates the need for TIPC to compute the size of outgoing
messages itself, as well as the check for an oversize message in
tipc_msg_build().  In addition, this change warrants an explanation:

   -     res = send_packet(NULL, sock, &my_msg, 0);
   +     res = send_packet(NULL, sock, &my_msg, bytes_to_send);

Previously, the final argument to send_packet() was ignored (since the
amount of data being sent was recalculated by a lower-level routine)
and we could just pass in a dummy value (0). Now that the
recalculation is being eliminated, the argument value being passed to
send_packet() is significant and we have to supply the actual amount
of data we want to send.

Signed-off-by: Allan Stephens <Allan.Stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

1 files changed, 9 insertions, 5 deletions

diff --git a/net/tipc/port.h b/net/tipc/port.h
index 87b9424ae0e..b9aa34195ae 100644
--- a/net/tipc/port.h
+++ b/net/tipc/port.h
@@ -205,23 +205,27 @@ int tipc_disconnect_port(struct tipc_port *tp_ptr);
 /*
  * TIPC messaging routines
  */
-int tipc_send(u32 portref, unsigned int num_sect, struct iovec const *msg_sect);
+int tipc_send(u32 portref, unsigned int num_sect, struct iovec const *msg_sect,
+              unsigned int total_len);
 
 int tipc_send2name(u32 portref, struct tipc_name const *name, u32 domain,
-                unsigned int num_sect, struct iovec const *msg_sect);
+                   unsigned int num_sect, struct iovec const *msg_sect,
+                   unsigned int total_len);
 
 int tipc_send2port(u32 portref, struct tipc_portid const *dest,
-                unsigned int num_sect, struct iovec const *msg_sect);
+                   unsigned int num_sect, struct iovec const *msg_sect,
+                   unsigned int total_len);
 
 int tipc_send_buf2port(u32 portref, struct tipc_portid const *dest,
                 struct sk_buff *buf, unsigned int dsz);
 
 int tipc_multicast(u32 portref, struct tipc_name_seq const *seq,
-                unsigned int section_count, struct iovec const *msg);
+                   unsigned int section_count, struct iovec const *msg,
+                   unsigned int total_len);
 
 int tipc_port_reject_sections(struct tipc_port *p_ptr, struct tipc_msg *hdr,
                               struct iovec const *msg_sect, u32 num_sect,
-                              int err);
+                              unsigned int total_len, int err);
 struct sk_buff *tipc_port_get_ports(void);
 void tipc_port_recv_proto_msg(struct sk_buff *buf);
 void tipc_port_recv_mcast(struct sk_buff *buf, struct port_list *dp);