On Wed, Apr 25, 2018 at 5:43 PM, Eric Dumazet <edumazet@xxxxxxxxxx> wrote: > 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. Acked-by: Soheil Hassas Yeganeh <soheil@xxxxxxxxxx> Thank you Eric for the nice redesign! > 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 >
