From cd40b7d3983c708aabe3d3008ec64ffce56d33b0 Mon Sep 17 00:00:00 2001 From: "Denis V. Lunev" Date: Wed, 10 Oct 2007 21:15:29 -0700 Subject: [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 Acked-by: Alexey Kuznetsov Signed-off-by: David S. Miller --- net/ipv4/fib_frontend.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) (limited to 'net/ipv4/fib_frontend.c') diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c index f823ca34cb1..a5cba234960 100644 --- a/net/ipv4/fib_frontend.c +++ b/net/ipv4/fib_frontend.c @@ -62,6 +62,9 @@ static struct hlist_head fib_table_hash[FIB_TABLE_HASHSZ]; #define FIB_TABLE_HASHSZ 256 static struct hlist_head fib_table_hash[FIB_TABLE_HASHSZ]; +static struct sock *fibnl = NULL; + + struct fib_table *fib_new_table(u32 id) { struct fib_table *tb; @@ -811,13 +814,13 @@ static void nl_fib_input(struct sock *sk, int len) pid = NETLINK_CB(skb).pid; /* pid of sending process */ NETLINK_CB(skb).pid = 0; /* from kernel */ NETLINK_CB(skb).dst_group = 0; /* unicast */ - netlink_unicast(sk, skb, pid, MSG_DONTWAIT); + netlink_unicast(fibnl, skb, pid, MSG_DONTWAIT); } static void nl_fib_lookup_init(void) { - netlink_kernel_create(&init_net, NETLINK_FIB_LOOKUP, 0, nl_fib_input, - NULL, THIS_MODULE); + fibnl = netlink_kernel_create(&init_net, NETLINK_FIB_LOOKUP, 0, + nl_fib_input, NULL, THIS_MODULE); } static void fib_disable_ip(struct net_device *dev, int force) -- cgit v1.2.3