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| author |   Willem de Bruijn <willemb@google.com> | 2017-08-03 16:29:39 -0400 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-08-03 21:37:29 -0700 |
| commit | 52267790ef52d7513879238ca9fac22c1733e0e3 (patch) | |
| tree | 3df2cd31743717fbf4335b950cc52328f2f44f14 /include/linux/socket.h | |
| parent | sock: skb_copy_ubufs support for compound pages (diff) | |
| download | linux-dev-52267790ef52d7513879238ca9fac22c1733e0e3.tar.xz linux-dev-52267790ef52d7513879238ca9fac22c1733e0e3.zip | |
sock: add MSG_ZEROCOPY
The kernel supports zerocopy sendmsg in virtio and tap. Expand the
infrastructure to support other socket types. Introduce a completion
notification channel over the socket error queue. Notifications are
returned with ee_origin SO_EE_ORIGIN_ZEROCOPY. ee_errno is 0 to avoid
blocking the send/recv path on receiving notifications.
Add reference counting, to support the skb split, merge, resize and
clone operations possible with SOCK_STREAM and other socket types.
The patch does not yet modify any datapaths.
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/socket.h')
| -rw-r--r-- | include/linux/socket.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/socket.h b/include/linux/socket.h index 8b13db5163cc..8ad963cdc88c 100644 --- a/include/linux/socket.h +++ b/include/linux/socket.h @@ -287,6 +287,7 @@ struct ucred { #define MSG_BATCH 0x40000 /* sendmmsg(): more messages coming */ #define MSG_EOF MSG_FIN +#define MSG_ZEROCOPY 0x4000000 /* Use user data in kernel path */ #define MSG_FASTOPEN 0x20000000 /* Send data in TCP SYN */ #define MSG_CMSG_CLOEXEC 0x40000000 /* Set close_on_exec for file descriptor received through |