Re: [PATCH v5 bpf-next 02/11] tcp: Add num_closed_socks to struct sock_reuseport.
From: Kuniyuki Iwashima <hidden>
Date: 2021-05-15 04:03:54
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From: Martin KaFai Lau <redacted> Date: Fri, 14 May 2021 17:49:18 -0700
On Mon, May 10, 2021 at 12:44:24PM +0900, Kuniyuki Iwashima wrote:quoted
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 <redacted>
Thank you!