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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>,
	Soheil Hassas Yeganeh <soheil@google.com>,
	Eric Dumazet <edumazet@google.com>,
	Eric Dumazet <eric.dumazet@gmail.com>
Subject: [PATCH net-next 0/2] tcp: mmap: rework zerocopy receive
Date: Tue, 24 Apr 2018 22:27:20 -0700	[thread overview]
Message-ID: <20180425052722.73022-1-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.

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                         | 186 +++++++++++++------------
 tools/testing/selftests/net/tcp_mmap.c |  63 +++++----
 3 files changed, 139 insertions(+), 118 deletions(-)

-- 
2.17.0.484.g0c8726318c-goog

             reply	other threads:[~2018-04-25  5:27 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-25  5:27 Eric Dumazet [this message]
2018-04-25  5:27 ` [PATCH net-next 1/2] tcp: add TCP_ZEROCOPY_RECEIVE support for " Eric Dumazet
2018-04-25  6:28   ` Christoph Hellwig
2018-04-25 13:01     ` Eric Dumazet
2018-04-25 15:24       ` Christoph Hellwig
2018-04-25 16:04       ` Matthew Wilcox
2018-04-25 16:20         ` Eric Dumazet
2018-04-25 16:30           ` Matthew Wilcox
2018-04-25 16:22         ` Andy Lutomirski
2018-04-25 16:35           ` Eric Dumazet
2018-04-25 16:44             ` Eric Dumazet
2018-04-25 13:42   ` Eric Dumazet
2018-04-25  5:27 ` [PATCH net-next 2/2] selftests: net: tcp_mmap must use TCP_ZEROCOPY_RECEIVE Eric Dumazet

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