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Date: Mon, 7 Mar 2016 14:11:08 -0800
From: Tom Herbert <tom@...bertland.com>
To: <davem@...emloft.net>, <netdev@...r.kernel.org>
CC: <kernel-team@...com>
Subject: [PATCH v2 net-next 09/13] kcm: Splice support
Implement kcm_splice_read. This is supported only for seqpacket.
Add kcm_seqpacket_ops and set splice read to kcm_splice_read.
Signed-off-by: Tom Herbert <tom@...bertland.com>
---
net/kcm/kcmsock.c | 98 +++++++++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 96 insertions(+), 2 deletions(-)
diff --git a/net/kcm/kcmsock.c b/net/kcm/kcmsock.c
index f938d7d..982ea5f 100644
--- a/net/kcm/kcmsock.c
+++ b/net/kcm/kcmsock.c
@@ -1256,6 +1256,76 @@ out:
return copied ? : err;
}
+static ssize_t kcm_sock_splice(struct sock *sk,
+ struct pipe_inode_info *pipe,
+ struct splice_pipe_desc *spd)
+{
+ int ret;
+
+ release_sock(sk);
+ ret = splice_to_pipe(pipe, spd);
+ lock_sock(sk);
+
+ return ret;
+}
+
+static ssize_t kcm_splice_read(struct socket *sock, loff_t *ppos,
+ struct pipe_inode_info *pipe, size_t len,
+ unsigned int flags)
+{
+ struct sock *sk = sock->sk;
+ struct kcm_sock *kcm = kcm_sk(sk);
+ long timeo;
+ struct kcm_rx_msg *rxm;
+ int err = 0;
+ size_t copied;
+ struct sk_buff *skb;
+
+ /* Only support splice for SOCKSEQPACKET */
+
+ timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
+
+ lock_sock(sk);
+
+ skb = kcm_wait_data(sk, flags, timeo, &err);
+ if (!skb)
+ goto err_out;
+
+ /* Okay, have a message on the receive queue */
+
+ rxm = kcm_rx_msg(skb);
+
+ if (len > rxm->full_len)
+ len = rxm->full_len;
+
+ copied = skb_splice_bits(skb, sk, rxm->offset, pipe, len, flags,
+ kcm_sock_splice);
+ if (copied < 0) {
+ err = copied;
+ goto err_out;
+ }
+
+ KCM_STATS_ADD(kcm->stats.rx_bytes, copied);
+
+ rxm->offset += copied;
+ rxm->full_len -= copied;
+
+ /* We have no way to return MSG_EOR. If all the bytes have been
+ * read we still leave the message in the receive socket buffer.
+ * A subsequent recvmsg needs to be done to return MSG_EOR and
+ * finish reading the message.
+ */
+
+ release_sock(sk);
+
+ return copied;
+
+err_out:
+ release_sock(sk);
+
+ return err;
+}
+
/* kcm sock lock held */
static void kcm_recv_disable(struct kcm_sock *kcm)
{
@@ -1907,7 +1977,7 @@ static int kcm_release(struct socket *sock)
return 0;
}
-static const struct proto_ops kcm_ops = {
+static const struct proto_ops kcm_dgram_ops = {
.family = PF_KCM,
.owner = THIS_MODULE,
.release = kcm_release,
@@ -1928,6 +1998,28 @@ static const struct proto_ops kcm_ops = {
.sendpage = sock_no_sendpage,
};
+static const struct proto_ops kcm_seqpacket_ops = {
+ .family = PF_KCM,
+ .owner = THIS_MODULE,
+ .release = kcm_release,
+ .bind = sock_no_bind,
+ .connect = sock_no_connect,
+ .socketpair = sock_no_socketpair,
+ .accept = sock_no_accept,
+ .getname = sock_no_getname,
+ .poll = datagram_poll,
+ .ioctl = kcm_ioctl,
+ .listen = sock_no_listen,
+ .shutdown = sock_no_shutdown,
+ .setsockopt = kcm_setsockopt,
+ .getsockopt = kcm_getsockopt,
+ .sendmsg = kcm_sendmsg,
+ .recvmsg = kcm_recvmsg,
+ .mmap = sock_no_mmap,
+ .sendpage = sock_no_sendpage,
+ .splice_read = kcm_splice_read,
+};
+
/* Create proto operation for kcm sockets */
static int kcm_create(struct net *net, struct socket *sock,
int protocol, int kern)
@@ -1938,8 +2030,10 @@ static int kcm_create(struct net *net, struct socket *sock,
switch (sock->type) {
case SOCK_DGRAM:
+ sock->ops = &kcm_dgram_ops;
+ break;
case SOCK_SEQPACKET:
- sock->ops = &kcm_ops;
+ sock->ops = &kcm_seqpacket_ops;
break;
default:
return -ESOCKTNOSUPPORT;
--
2.6.5
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