linux-stable.git/drivers/connector/cn_queue.c, branch linux-2.6.28.y

connector: convert to single-threaded workqueue

2008-03-24T04:51:12+00:00

From: Evgeniy Polyakov 

We don't need one cqueue thread for each CPU.  cqueue is used for
receiving userspace datagrams, which are very rare and thus will
happily live with a single queue.

Signed-off-by: Andrew Morton 
Signed-off-by: David S. Miller

[CONNECTOR]: Cleanup struct cn_callback_entry

2008-01-28T23:00:40+00:00

- 'cb' is a fake struct member. In a previous patch struct cn_callback
was renamed to cn_callback_id, so 'cb' should have been deleted at that
time.

- 'nls' isn't used and is redundant, we can retrieve this data through
cn_callback_entry.pdev->nls.

- 'seq' and 'group' should be u32, as they are declared to be u32 in
other places.

Signed-off-by: Li Zefan 
Signed-off-by: David S. Miller

[CONNECTOR]: Cleanup struct cn_queue_dev

2008-01-28T23:00:39+00:00

Struct member netlink_groups is never used, and I don't see how it can
be useful.

Signed-off-by: Li Zefan 
Signed-off-by: David S. Miller

[CONNECTOR]: Don't touch queue dev after decrement of ref count.

2008-01-09T07:44:44+00:00

cn_queue_free_callback() will touch 'dev'(i.e. cbq->pdev), so it
should be called before atomic_dec(&dev->refcnt).

Signed-off-by: Li Zefan 
Signed-off-by: David S. Miller

[CONNECTOR]: Replace delayed work with usual work queue.

2006-12-18T09:53:58+00:00

Signed-off-by: Evgeniy Polyakov 
Signed-off-by: David S. Miller

WorkStruct: make allyesconfig

2006-11-22T14:57:56+00:00

Fix up for make allyesconfig.

Signed-Off-By: David Howells

[CONNECTOR]: Fix warning in cn_queue.c

2006-06-18T04:29:43+00:00

cn_queue.c:130: warning: value computed is not used

There is no point in testing the atomic value if the result is thrown
away.

From Evgeniy:

It was created to put implicit smp barrier, but it is not needed there.

Signed-off-by: Andreas Schwab 
Signed-off-by: Evgeniy Polyakov 
Signed-off-by: David S. Miller

[CONNECTOR]: async connector mode.

2005-09-26T22:06:50+00:00

If input message rate from userspace is too high, do not drop them,
but try to deliver using work queue allocation.

Failing there is some kind of congestion control.

It also removes warn_on on this condition, which scares people.

Signed-off-by: Evgeniy Polyakov 
Signed-off-by: David S. Miller

[NET]: Add netlink connector.

2005-09-12T02:15:07+00:00

Kernel connector - new userspace <-> kernel space easy to use
communication module which implements easy to use bidirectional
message bus using netlink as it's backend.  Connector was created to
eliminate complex skb handling both in send and receive message bus
direction.

Connector driver adds possibility to connect various agents using as
one of it's backends netlink based network.  One must register
callback and identifier. When driver receives special netlink message
with appropriate identifier, appropriate callback will be called.

From the userspace point of view it's quite straightforward:

	socket();
	bind();
	send();
	recv();

But if kernelspace want to use full power of such connections, driver
writer must create special sockets, must know about struct sk_buff
handling...  Connector allows any kernelspace agents to use netlink
based networking for inter-process communication in a significantly
easier way:

int cn_add_callback(struct cb_id *id, char *name, void (*callback) (void *));
void cn_netlink_send(struct cn_msg *msg, u32 __groups, int gfp_mask);

struct cb_id
{
	__u32			idx;
	__u32			val;
};

idx and val are unique identifiers which must be registered in
connector.h for in-kernel usage.  void (*callback) (void *) - is a
callback function which will be called when message with above idx.val
will be received by connector core.

Using connector completely hides low-level transport layer from it's
users.

Connector uses new netlink ability to have many groups in one socket.

[ Incorporating many cleanups and fixes by myself and
  Andrew Morton -DaveM ]

Signed-off-by: Evgeniy Polyakov 
Signed-off-by: Andrew Morton 
Signed-off-by: David S. Miller