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authorWillem de Bruijn <willemb@google.com>2017-08-03 16:29:39 -0400
committerDavid S. Miller <davem@davemloft.net>2017-08-03 21:37:29 -0700
commit52267790ef52d7513879238ca9fac22c1733e0e3 (patch)
tree3df2cd31743717fbf4335b950cc52328f2f44f14 /include/linux/socket.h
parent3ece782693c4b64d588dd217868558ab9a19bfe7 (diff)
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.h1
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