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From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Jakub Sitnicki <jakub@cloudflare.com>
Cc: bpf@vger.kernel.org, John Fastabend <john.fastabend@gmail.com>,
	Martin KaFai Lau <kafai@fb.com>,
	netdev@vger.kernel.org, kernel-team@cloudflare.com
Subject: Re: [RFC bpf-next 0/5] Extend SOCKMAP to store listening sockets
Date: Thu, 24 Oct 2019 09:12:09 -0700	[thread overview]
Message-ID: <20191024161208.nh2hgsgtscmmfl7w@ast-mbp.dhcp.thefacebook.com> (raw)
In-Reply-To: <20191022113730.29303-1-jakub@cloudflare.com>

On Tue, Oct 22, 2019 at 01:37:25PM +0200, Jakub Sitnicki wrote:
> This patch set is a follow up on a suggestion from LPC '19 discussions to
> make SOCKMAP (or a new map type derived from it) a generic type for storing
> established as well as listening sockets.
> 
> We found ourselves in need of a map type that keeps references to listening
> sockets when working on making the socket lookup programmable, aka BPF
> inet_lookup [1].  Initially we repurposed REUSEPORT_SOCKARRAY but found it
> problematic to extend due to being tightly coupled with reuseport
> logic (see slides [2]). So we've turned our attention to SOCKMAP instead.
> 
> As it turns out the changes needed to make SOCKMAP suitable for storing
> listening sockets are self-contained and have use outside of programming
> the socket lookup. Hence this patch set.
> 
> With these patches SOCKMAP can be used in SK_REUSEPORT BPF programs as a
> drop-in replacement for REUSEPORT_SOCKARRAY for TCP. This can hopefully
> lead to code consolidation between the two map types in the future.
> 
> Having said that, the main intention here is to lay groundwork for using
> SOCKMAP in the next iteration of programmable socket lookup patches.
> 
> I'm looking for feedback if there's anything fundamentally wrong with
> extending SOCKMAP map type like this that I might have missed.

John, Martin,
comments?


  parent reply	other threads:[~2019-10-24 16:12 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-22 11:37 Jakub Sitnicki
2019-10-22 11:37 ` [RFC bpf-next 1/5] bpf, sockmap: Let BPF helpers use lookup operation on SOCKMAP Jakub Sitnicki
2019-10-24 16:59   ` John Fastabend
2019-10-22 11:37 ` [RFC bpf-next 2/5] bpf, sockmap: Allow inserting listening TCP sockets into SOCKMAP Jakub Sitnicki
2019-10-24 17:06   ` John Fastabend
2019-10-25  9:41     ` Jakub Sitnicki
2019-10-22 11:37 ` [RFC bpf-next 3/5] bpf, sockmap: Don't let child socket inherit psock or its ops on copy Jakub Sitnicki
2019-10-22 11:37 ` [RFC bpf-next 4/5] bpf: Allow selecting reuseport socket from a SOCKMAP Jakub Sitnicki
2019-10-22 11:37 ` [RFC bpf-next 5/5] selftests/bpf: Extend SK_REUSEPORT tests to cover SOCKMAP Jakub Sitnicki
2019-10-24 16:12 ` Alexei Starovoitov [this message]
2019-10-24 16:56 ` [RFC bpf-next 0/5] Extend SOCKMAP to store listening sockets John Fastabend
2019-10-25  9:26   ` Jakub Sitnicki
2019-10-25 14:18     ` John Fastabend
2019-10-28  5:52 ` Martin Lau
2019-10-28 12:35   ` Jakub Sitnicki
2019-10-28 19:04     ` John Fastabend
2019-10-29  8:56       ` Jakub Sitnicki
2019-10-28 20:42     ` Martin Lau
2019-10-28 21:05       ` John Fastabend
2019-10-28 21:38         ` Martin Lau
2019-10-29  8:52           ` Jakub Sitnicki

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