netdev - Re: [PATCH] net: udp: add socket option to report RX queue level

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1489788070.28631.322.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Fri, 17 Mar 2017 15:01:10 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Chris Kuiper <ckuiper@...gle.com>, Josh Hunt <johunt@...mai.com>
Cc:     netdev@...r.kernel.org, pgynther@...gle.com
Subject: Re: [PATCH] net: udp: add socket option to report RX queue level

On Fri, 2017-03-17 at 14:13 -0700, Chris Kuiper wrote:
> This adds a new socket option "SO_RXQ_ALLOC" that enables providing
> the RX queue buffer allocation as ancillary data from the recvmsg()
> system call. The value reported is a byte number and together with
> the RX queue size (obtained via getsockopt(SO_RCVBUF) can be used to
> calculate a percentage value on how full the socket buffer is.
> ---

Seems a lot of overhead, and only UDP would be supported.

I very much prefer Josh Hunt proposal
( https://patchwork.ozlabs.org/patch/738250/ )

Ie using a separate getsockopt() call instead of adding code to UDP fast
path ?