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authorDenis V. Lunev <den@openvz.org>2007-10-10 21:15:29 -0700
committerDavid S. Miller <davem@davemloft.net>2007-10-10 21:15:29 -0700
commitcd40b7d3983c708aabe3d3008ec64ffce56d33b0 (patch)
tree0d6fe9cfd2f03fdeee126e317d4bfb145afc458d /include
parentaed815601f3f95281ab3a01f7e2cbe1bd54285a0 (diff)
[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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/connector.h2
-rw-r--r--include/linux/netlink.h2
-rw-r--r--include/net/netlink.h6
3 files changed, 5 insertions, 5 deletions
diff --git a/include/linux/connector.h b/include/linux/connector.h
index 10eb56b2940a..b62f823e90cf 100644
--- a/include/linux/connector.h
+++ b/include/linux/connector.h
@@ -153,7 +153,7 @@ struct cn_dev {
u32 seq, groups;
struct sock *nls;
- void (*input) (struct sock * sk, int len);
+ void (*input) (struct sk_buff *skb);
struct cn_queue_dev *cbdev;
};
diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index 7b552b6c2c19..7c1f3b1d2ee5 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -175,7 +175,7 @@ struct netlink_skb_parms
extern struct sock *netlink_kernel_create(struct net *net,
int unit,unsigned int groups,
- void (*input)(struct sock *sk, int len),
+ void (*input)(struct sk_buff *skb),
struct mutex *cb_mutex,
struct module *module);
extern int netlink_change_ngroups(struct sock *sk, unsigned int groups);
diff --git a/include/net/netlink.h b/include/net/netlink.h
index 1afd3e837d23..9298218c07f9 100644
--- a/include/net/netlink.h
+++ b/include/net/netlink.h
@@ -220,9 +220,9 @@ struct nl_info {
u32 pid;
};
-extern unsigned int netlink_run_queue(struct sock *sk, unsigned int qlen,
- int (*cb)(struct sk_buff *,
- struct nlmsghdr *));
+extern int netlink_rcv_skb(struct sk_buff *skb,
+ int (*cb)(struct sk_buff *,
+ struct nlmsghdr *));
extern int nlmsg_notify(struct sock *sk, struct sk_buff *skb,
u32 pid, unsigned int group, int report,
gfp_t flags);