Re: [Linuxptp-devel] [PATCH 1/8] rtnl: use ifinfomsg instead of rtgenmsg to request link info

[Hangbin L. <liu...@gm...>]

On Tue, Jul 04, 2017 at 11:02:26AM +0200, Richard Cochran wrote:
> > Back to this question, do you still want to move rtnl socket from clock to
> > per port?
> 
> Yes, but only if we can use a single rtnl socket for both messages.

Hmm.. If we want to use a single rtnl socket on all ports. we need create it
before port_open() and give the fd to the new port.

On the other hand, if we use the same socket,
1) events & POLLIN , we have a notify message with port 2 iface index.
2) on port 1, rtnl_link_status(rtnl_fd, port_link_status, p). Then all notify
   message received. But after check, the if index is not match
3) on port 2, call rtnl_link_status(), but the message on this socket already
   recieved. Then we will miss the notify.

So I think we need to make each port have their own rtnl socket fd. Then each
fd get their own multicast rtnl message.

What do you think?

Thanks
Hangbin