On Fri, Jan 30, 2009 at 10:23 PM, Greg KH <greg@xxxxxxxxx> wrote: > On Fri, Jan 30, 2009 at 02:55:01PM -0500, Bob Beers wrote: >> I have a voip device where I currently send my data up/down between driver >> and user space using an interrupt driven read/write scheme. I send/recv >> the data using standard UDP packets in userspace. I'd like to try to decrease >> my end-to-end latency by letting the driver send/recv most of this >> data directly >> to the network. >> >> Are there drivers which already do this kind of thing that I might learn from? > > You can access the socket interface directly within the kernel, look for > that, and any callers of this code, there should be a few users for you > to get an idea of how to use it. I've been following the example <http://kernelnewbies.org/Simple_UDP_Server>, and I am having some success -- only tried receiving so far -- but I am getting an error when I try to insert the following between the sock_create and bind calls. -----------8<------------------ { int arg = 1; err = kthread->sock->ops->setsockopt(kthread->sock, SOL_SOCKET, SO_REUSEADDR, (void *)&arg, sizeof(arg)); if (err) { printk(KERN_INFO, "kthread[%d] setsockopt REUSEADDR error: %d\n", kthread->voipch, err); } } -----------8<------------------ Here is the error message: ksocket_start: kthread[0] setsockopt REUSEADDR error: -92 The packets are recv'd, but why can't I use SO_REUSEADDR ??? Thanks, -Bob -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
