LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Eric Dumazet <edumazet@google.com>
To: "David S . Miller" <davem@davemloft.net>
Cc: netdev <netdev@vger.kernel.org>,
	Andy Lutomirski <luto@kernel.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	linux-mm <linux-mm@kvack.org>, Eric Dumazet <edumazet@google.com>,
	Eric Dumazet <eric.dumazet@gmail.com>
Subject: [PATCH v2 net-next 0/2] tcp: mmap: rework zerocopy receive
Date: Wed, 25 Apr 2018 14:43:05 -0700	[thread overview]
Message-ID: <20180425214307.159264-1-edumazet@google.com> (raw)

syzbot reported a lockdep issue caused by tcp mmap() support.

I implemented Andy Lutomirski nice suggestions to resolve the
issue and increase scalability as well.

First patch is adding a new setsockopt() operation and changes mmap()
behavior.

Second patch changes tcp_mmap reference program.

v2:
 Added a missing page align of zc->length in tcp_zerocopy_receive()
 Properly clear zc->recv_skip_hint in case user request was completed.

Eric Dumazet (2):
  tcp: add TCP_ZEROCOPY_RECEIVE support for zerocopy receive
  selftests: net: tcp_mmap must use TCP_ZEROCOPY_RECEIVE

 include/uapi/linux/tcp.h               |   8 ++
 net/ipv4/tcp.c                         | 189 +++++++++++++------------
 tools/testing/selftests/net/tcp_mmap.c |  63 +++++----
 3 files changed, 142 insertions(+), 118 deletions(-)

-- 
2.17.0.441.gb46fe60e1d-goog

             reply	other threads:[~2018-04-25 21:43 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-25 21:43 Eric Dumazet [this message]
2018-04-25 21:43 ` [PATCH v2 net-next 1/2] tcp: add TCP_ZEROCOPY_RECEIVE support for " Eric Dumazet
2018-04-26 13:40   ` Ka-Cheong Poon
2018-04-26 13:47     ` Eric Dumazet
2018-04-27  8:44   ` kbuild test robot
2018-04-27 13:03     ` Eric Dumazet
2018-04-25 21:43 ` [PATCH v2 net-next 2/2] selftests: net: tcp_mmap must use TCP_ZEROCOPY_RECEIVE Eric Dumazet
2018-04-26  1:20 ` [PATCH v2 net-next 0/2] tcp: mmap: rework zerocopy receive Soheil Hassas Yeganeh
2018-04-26 14:56   ` Eric Dumazet
2018-04-26 21:16     ` Andy Lutomirski
2018-04-26 21:40       ` Eric Dumazet

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20180425214307.159264-1-edumazet@google.com \
    --to=edumazet@google.com \
    --cc=davem@davemloft.net \
    --cc=eric.dumazet@gmail.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=luto@kernel.org \
    --cc=netdev@vger.kernel.org \
    --subject='Re: [PATCH v2 net-next 0/2] tcp: mmap: rework zerocopy receive' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).