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Date: Fri, 27 Apr 2018 08:58:07 -0700 From: Eric Dumazet <edumazet@...gle.com> To: "David S . Miller" <davem@...emloft.net> Cc: netdev <netdev@...r.kernel.org>, Andy Lutomirski <luto@...nel.org>, linux-kernel <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>, Ka-Cheong Poon <ka-cheong.poon@...cle.com>, Eric Dumazet <edumazet@...gle.com>, Eric Dumazet <eric.dumazet@...il.com> Subject: [PATCH v4 net-next 0/2] tcp: mmap: rework zerocopy receive 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 getsockopt() operation and changes mmap() behavior. Second patch changes tcp_mmap reference program. v4: tcp mmap() support depends on CONFIG_MMU, as kbuild bot told us. v3: change TCP_ZEROCOPY_RECEIVE to be a getsockopt() option instead of setsockopt(), feedback from Ka-Cheon Poon 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/af_inet.c | 2 + net/ipv4/tcp.c | 196 +++++++++++++------------ net/ipv6/af_inet6.c | 2 + tools/testing/selftests/net/tcp_mmap.c | 64 ++++---- 5 files changed, 154 insertions(+), 118 deletions(-) -- 2.17.0.441.gb46fe60e1d-goog
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