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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 /net/core/sock.c
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 'net/core/sock.c')
-rw-r--r--net/core/sock.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/core/sock.c b/net/core/sock.c
index 1261880bdcc8..e8b696858cad 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1670,6 +1670,7 @@ struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
atomic_set(&newsk->sk_drops, 0);
newsk->sk_send_head = NULL;
newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
+ atomic_set(&newsk->sk_zckey, 0);
sock_reset_flag(newsk, SOCK_DONE);
@@ -2722,6 +2723,7 @@ void sock_init_data(struct socket *sock, struct sock *sk)
sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
sk->sk_stamp = SK_DEFAULT_STAMP;
+ atomic_set(&sk->sk_zckey, 0);
#ifdef CONFIG_NET_RX_BUSY_POLL
sk->sk_napi_id = 0;