linux-stable/net/tipc
Jon Paul Maloy 1dab3d5ac2 tipc: change reception of tunnelled duplicate packets
When a second link to a destination comes up, some sender sockets will
steer their subsequent traffic through the new link. In order to
guarantee preserved packet order and cardinality for those sockets, we
tunnel a duplicate of the old link's send queue through the new link
before we open it for regular traffic. The last arriving packet copy,
on whichever link, will be dropped at the receiving end based on the
original sequence number, to ensure that only one copy is delivered to
the end receiver.

In this commit, we change the algorithm for receiving DUPLICATE_MSG
packets, at the same time delegating it to a new subfunction,
tipc_link_dup_rcv(). Instead of returning an extracted inner packet to
the packet reception loop in tipc_rcv(), we just add it to the receiving
(new) link's deferred packet queue. The packet will then be processed by
that link when it receives its first non-tunneled packet, i.e., at
latest when the changeover procedure is finished.

Because tipc_link_tunnel_rcv()/tipc_link_dup_rcv() now is consuming all
packets of type DUPLICATE_MSG, the calling tipc_rcv() function can omit
testing for this. This in turn means that the current conditional jump
to the label 'protocol_check' becomes redundant, and we can remove that
label.

Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-02-13 17:57:06 -05:00
..
addr.c tipc: compress out gratuitous extra carriage returns 2012-04-30 15:53:56 -04:00
addr.h tipc: explicitly include core.h in addr.h 2014-02-13 17:49:13 -05:00
bcast.c tipc: stricter behavior of message reassembly function 2014-02-13 17:57:05 -05:00
bcast.h tipc: cosmetic realignment of function arguments 2013-06-17 15:53:01 -07:00
bearer.c tipc: remove 'links' list from tipc_bearer struct 2014-02-13 17:57:05 -05:00
bearer.h tipc: remove 'links' list from tipc_bearer struct 2014-02-13 17:57:05 -05:00
config.c tipc: convert config_lock from spinlock to mutex 2013-06-17 15:53:01 -07:00
config.h tipc: Optimize re-initialization of configuration service 2012-04-26 17:19:07 -04:00
core.c tipc: remove 'links' list from tipc_bearer struct 2014-02-13 17:57:05 -05:00
core.h tipc: Use <linux/uaccess.h> instead of <asm/uaccess.h> 2013-12-16 12:48:35 -05:00
discover.c tipc: introduce new spinlock to protect struct link_req 2014-01-07 18:44:25 -05:00
discover.h tipc: rename struct link* to struct tipc_link* 2011-12-29 21:53:30 -05:00
eth_media.c tipc: eliminate code duplication in media layer 2013-12-11 00:17:43 -05:00
handler.c tipc: protect handler_enabled variable with qitem_lock spin lock 2013-12-10 22:35:49 -05:00
ib_media.c tipc: eliminate code duplication in media layer 2013-12-11 00:17:43 -05:00
Kconfig tipc: add InfiniBand media type 2013-04-17 14:18:33 -04:00
link.c tipc: change reception of tunnelled duplicate packets 2014-02-13 17:57:06 -05:00
link.h tipc: remove 'links' list from tipc_bearer struct 2014-02-13 17:57:05 -05:00
log.c tipc: remove print_buf and deprecated log buffer code 2012-07-13 19:34:43 -04:00
Makefile tipc: introduce new TIPC server infrastructure 2013-06-17 15:53:00 -07:00
msg.c tipc: remove iovec length parameter from all sending functions 2013-10-18 13:20:42 -04:00
msg.h tipc: message reassembly using fragment chain 2013-11-07 18:30:11 -05:00
name_distr.c tipc: eliminate an unnecessary cast of node variable 2012-11-22 14:33:28 -05:00
name_distr.h
name_table.c tipc: remove unnecessary variables and conditions 2013-12-16 12:48:35 -05:00
name_table.h tipc: cosmetic realignment of function arguments 2013-06-17 15:53:01 -07:00
net.c tipc: change tipc_net_start routine return value type 2012-08-20 02:26:30 -07:00
net.h tipc: change tipc_net_start routine return value type 2012-08-20 02:26:30 -07:00
netlink.c genetlink: only pass array to genl_register_family_with_ops() 2013-11-19 16:39:05 -05:00
node.c tipc: rename functions related to link failover and improve comments 2014-01-07 18:44:25 -05:00
node.h tipc: remove 'has_redundant_link' flag from STATE link protocol messages 2014-01-07 18:44:25 -05:00
node_subscr.c tipc: cosmetic realignment of function arguments 2013-06-17 15:53:01 -07:00
node_subscr.h tipc: compress out gratuitous extra carriage returns 2012-04-30 15:53:56 -04:00
port.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-01-06 17:37:45 -05:00
port.h tipc: fix deadlock during socket release 2013-12-29 22:24:07 -05:00
ref.c tipc: use standard printk shortcut macros (pr_err etc.) 2012-07-13 19:24:44 -04:00
ref.h tipc: cleanup function namespace 2010-10-16 11:13:24 -07:00
server.c tipc: spelling fixes 2014-01-14 18:18:22 -08:00
server.h tipc: introduce new TIPC server infrastructure 2013-06-17 15:53:00 -07:00
socket.c net: add build-time checks for msg->msg_name size 2014-01-18 23:04:16 -08:00
subscr.c tipc: spelling fixes 2014-01-14 18:18:22 -08:00
subscr.h tipc: cosmetic realignment of function arguments 2013-06-17 15:53:01 -07:00
sysctl.c tipc: change socket buffer overflow control to respect sk_rcvbuf 2013-06-17 15:53:00 -07:00