On Mon, May 10, 2021 at 12:44:24PM +0900, Kuniyuki Iwashima wrote: > As noted in the following commit, a closed listener has to hold the > reference to the reuseport group for socket migration. This patch adds a > field (num_closed_socks) to struct sock_reuseport to manage closed sockets > within the same reuseport group. Moreover, this and the following commits > introduce some helper functions to split socks[] into two sections and keep > TCP_LISTEN and TCP_CLOSE sockets in each section. Like a double-ended > queue, we will place TCP_LISTEN sockets from the front and TCP_CLOSE > sockets from the end. > > TCP_LISTEN----------> <-------TCP_CLOSE > +---+---+ --- +---+ --- +---+ --- +---+ > | 0 | 1 | ... | i | ... | j | ... | k | > +---+---+ --- +---+ --- +---+ --- +---+ > > i = num_socks - 1 > j = max_socks - num_closed_socks > k = max_socks - 1 > > This patch also extends reuseport_add_sock() and reuseport_grow() to > support num_closed_socks. Acked-by: Martin KaFai Lau <kafai@xxxxxx>
