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author | Eric Dumazet <edumazet@google.com> | 2018-04-27 08:58:09 -0700 |
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committer | David S. Miller <davem@davemloft.net> | 2018-04-29 21:29:55 -0400 |
commit | aacb0c2e524c38d7ab48b0beb86427a36807079f (patch) | |
tree | 8b917914f2e12f287d7be8334c227dd65fa8ec8a /drivers/infiniband/ulp/opa_vnic | |
parent | tcp: add TCP_ZEROCOPY_RECEIVE support for zerocopy receive (diff) | |
download | linux-dev-aacb0c2e524c38d7ab48b0beb86427a36807079f.tar.xz linux-dev-aacb0c2e524c38d7ab48b0beb86427a36807079f.zip |
selftests: net: tcp_mmap must use TCP_ZEROCOPY_RECEIVE
After prior kernel change, mmap() on TCP socket only reserves VMA.
We have to use getsockopt(fd, IPPROTO_TCP, TCP_ZEROCOPY_RECEIVE, ...)
to perform the transfert of pages from skbs in TCP receive queue into such VMA.
struct tcp_zerocopy_receive {
__u64 address; /* in: address of mapping */
__u32 length; /* in/out: number of bytes to map/mapped */
__u32 recv_skip_hint; /* out: amount of bytes to skip */
};
After a successful getsockopt(...TCP_ZEROCOPY_RECEIVE...), @length contains
number of bytes that were mapped, and @recv_skip_hint contains number of bytes
that should be read using conventional read()/recv()/recvmsg() system calls,
to skip a sequence of bytes that can not be mapped, because not properly page
aligned.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Andy Lutomirski <luto@kernel.org>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/infiniband/ulp/opa_vnic')
0 files changed, 0 insertions, 0 deletions