linux/net/decnet
Denis V. Lunev cd40b7d398 [NET]: make netlink user -> kernel interface synchronious
This patch make processing netlink user -> kernel messages synchronious.
This change was inspired by the talk with Alexey Kuznetsov about current
netlink messages processing. He says that he was badly wrong when introduced 
asynchronious user -> kernel communication.

The call netlink_unicast is the only path to send message to the kernel
netlink socket. But, unfortunately, it is also used to send data to the
user.

Before this change the user message has been attached to the socket queue
and sk->sk_data_ready was called. The process has been blocked until all
pending messages were processed. The bad thing is that this processing
may occur in the arbitrary process context.

This patch changes nlk->data_ready callback to get 1 skb and force packet
processing right in the netlink_unicast.

Kernel -> user path in netlink_unicast remains untouched.

EINTR processing for in netlink_run_queue was changed. It forces rtnl_lock
drop, but the process remains in the cycle until the message will be fully
processed. So, there is no need to use this kludges now.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Acked-by: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-10-10 21:15:29 -07:00
..
netfilter [NET]: make netlink user -> kernel interface synchronious 2007-10-10 21:15:29 -07:00
af_decnet.c [NET]: Make the device list and device lookups per namespace. 2007-10-10 16:49:10 -07:00
dn_dev.c [NET]: Make the loopback device per network namespace. 2007-10-10 16:52:49 -07:00
dn_fib.c [NET]: Make the device list and device lookups per namespace. 2007-10-10 16:49:10 -07:00
dn_neigh.c [DECNET]: Make decnet code use the seq_open_private() 2007-10-10 16:55:34 -07:00
dn_nsp_in.c [SK_BUFF]: Introduce skb_copy_from_linear_data{_offset} 2007-04-25 22:28:23 -07:00
dn_nsp_out.c [SK_BUFF]: Convert skb->tail to sk_buff_data_t 2007-04-25 22:26:28 -07:00
dn_route.c [DECNET]: Make decnet code use the seq_open_private() 2007-10-10 16:55:34 -07:00
dn_rules.c [IPV4/IPV6/DECNET]: Small cleanup for fib rules. 2007-10-10 16:51:22 -07:00
dn_table.c mm: Remove slab destructors from kmem_cache_create(). 2007-07-20 10:11:58 +09:00
dn_timer.c
Kconfig [NET]: Rethink mark field in struct flowi 2006-12-02 21:21:39 -08:00
Makefile
README
sysctl_net_decnet.c [NET]: Make the device list and device lookups per namespace. 2007-10-10 16:49:10 -07:00
TODO

                       Linux DECnet Project
                      ======================

The documentation for this kernel subsystem is available in the
Documentation/networking subdirectory of this distribution and also
on line at http://www.chygwyn.com/DECnet/

Steve Whitehouse <SteveW@ACM.org>