On Wed, Jun 07, 2017 at 07:43:44PM +0300, Leon Romanovsky wrote: > On Wed, Jun 7, 2017 at 7:37 PM, Jason Gunthorpe > <jguntho...@obsidianresearch.com> wrote: > > On Wed, Jun 07, 2017 at 07:19:01PM +0300, Leon Romanovsky wrote: > >> It makes me wonder if it is expected behavior for > >> ibnl_rcv_reply_skb() to handle !NLM_F_REQUEST messages and do we > >> really need it? What are the scenarios? In my use case, which is > >> for sure different from yours, I'm always setting NLM_F_REQUEST > >> while communicating with kernel. > > > > If I recall the user space SA code issues REQUESTS from the kernel to > > userspace, so userspace returns with the response format. This is > > abnormal for netlink hence the special function. > > In netlink semantics, kernel side is supposed to send netlink > notification message and userspace is supposed to send REQUEST.
That pattern is for async communications, the SA stuff needs a sync protocol, unfortunately. Jason
