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Date: Thu, 11 Feb 2021 12:47:48 +0100
From: Stefano Garzarella <sgarzare@...hat.com>
To: Arseny Krasnov <arseny.krasnov@...persky.com>
Cc: Stefan Hajnoczi <stefanha@...hat.com>,
"Michael S. Tsirkin" <mst@...hat.com>,
Jason Wang <jasowang@...hat.com>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Jorgen Hansen <jhansen@...are.com>,
Colin Ian King <colin.king@...onical.com>,
Andra Paraschiv <andraprs@...zon.com>,
Alexander Popov <alex.popov@...ux.com>, kvm@...r.kernel.org,
virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, stsp2@...dex.ru, oxffffaa@...il.com
Subject: Re: [RFC PATCH v4 04/17] af_vsock: implement SEQPACKET receive loop
On Sun, Feb 07, 2021 at 06:15:22PM +0300, Arseny Krasnov wrote:
>This adds receive loop for SEQPACKET. It looks like receive loop for
>STREAM, but there is a little bit difference:
>1) It doesn't call notify callbacks.
>2) It doesn't care about 'SO_SNDLOWAT' and 'SO_RCVLOWAT' values, because
> there is no sense for these values in SEQPACKET case.
>3) It waits until whole record is received or error is found during
> receiving.
>4) It processes and sets 'MSG_TRUNC' flag.
>
>So to avoid extra conditions for two types of socket inside one loop, two
>independent functions were created.
>
>Signed-off-by: Arseny Krasnov <arseny.krasnov@...persky.com>
>---
> include/net/af_vsock.h | 5 +++
> net/vmw_vsock/af_vsock.c | 96 +++++++++++++++++++++++++++++++++++++++-
> 2 files changed, 100 insertions(+), 1 deletion(-)
>
>diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h
>index b1c717286993..bb6a0e52be86 100644
>--- a/include/net/af_vsock.h
>+++ b/include/net/af_vsock.h
>@@ -135,6 +135,11 @@ struct vsock_transport {
> bool (*stream_is_active)(struct vsock_sock *);
> bool (*stream_allow)(u32 cid, u32 port);
>
>+ /* SEQ_PACKET. */
>+ size_t (*seqpacket_seq_get_len)(struct vsock_sock *);
>+ int (*seqpacket_dequeue)(struct vsock_sock *, struct msghdr *,
>+ int flags, bool *msg_ready);
CHECK: Alignment should match open parenthesis
#35: FILE: include/net/af_vsock.h:141:
+ int (*seqpacket_dequeue)(struct vsock_sock *, struct msghdr *,
+ int flags, bool *msg_ready);
And to make checkpatch.pl happy please use the identifier name also for
the others parameter. I know we haven't done this before, but for new
code I think we can do it.
>+
> /* Notification. */
> int (*notify_poll_in)(struct vsock_sock *, size_t, bool *);
> int (*notify_poll_out)(struct vsock_sock *, size_t, bool *);
>diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
>index 66c8a932f49b..3d8af987216a 100644
>--- a/net/vmw_vsock/af_vsock.c
>+++ b/net/vmw_vsock/af_vsock.c
>@@ -1977,6 +1977,97 @@ static int __vsock_stream_recvmsg(struct sock *sk, struct msghdr *msg,
> return err;
> }
>
>+static int __vsock_seqpacket_recvmsg(struct sock *sk, struct msghdr *msg,
>+ size_t len, int flags)
>+{
>+ const struct vsock_transport *transport;
>+ const struct iovec *orig_iov;
>+ unsigned long orig_nr_segs;
>+ bool msg_ready;
>+ struct vsock_sock *vsk;
>+ size_t record_len;
>+ long timeout;
>+ int err = 0;
>+ DEFINE_WAIT(wait);
>+
>+ vsk = vsock_sk(sk);
>+ transport = vsk->transport;
>+
>+ timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
>+ orig_nr_segs = msg->msg_iter.nr_segs;
>+ orig_iov = msg->msg_iter.iov;
>+ msg_ready = false;
>+ record_len = 0;
>+
>+ while (1) {
>+ err = vsock_wait_data(sk, &wait, timeout, NULL, 0);
>+
>+ if (err <= 0) {
>+ /* In case of any loop break(timeout, signal
>+ * interrupt or shutdown), we report user that
>+ * nothing was copied.
>+ */
>+ err = 0;
>+ break;
>+ }
>+
>+ if (record_len == 0) {
>+ record_len =
>+ transport->seqpacket_seq_get_len(vsk);
>+
>+ if (record_len == 0)
>+ continue;
>+ }
>+
>+ err = transport->seqpacket_dequeue(vsk, msg,
>+ flags, &msg_ready);
A single line here should be okay.
>+ if (err < 0) {
>+ if (err == -EAGAIN) {
>+ iov_iter_init(&msg->msg_iter, READ,
>+ orig_iov, orig_nr_segs,
>+ len);
>+ /* Clear 'MSG_EOR' here, because dequeue
>+ * callback above set it again if it was
>+ * set by sender. This 'MSG_EOR' is from
>+ * dropped record.
>+ */
>+ msg->msg_flags &= ~MSG_EOR;
>+ record_len = 0;
>+ continue;
>+ }
>+
>+ err = -ENOMEM;
>+ break;
>+ }
>+
>+ if (msg_ready)
>+ break;
>+ }
>+
>+ if (sk->sk_err)
>+ err = -sk->sk_err;
>+ else if (sk->sk_shutdown & RCV_SHUTDOWN)
>+ err = 0;
>+
>+ if (msg_ready) {
>+ /* User sets MSG_TRUNC, so return real length of
>+ * packet.
>+ */
>+ if (flags & MSG_TRUNC)
>+ err = record_len;
>+ else
>+ err = len - msg->msg_iter.count;
>+
>+ /* Always set MSG_TRUNC if real length of packet is
>+ * bigger than user's buffer.
>+ */
>+ if (record_len > len)
>+ msg->msg_flags |= MSG_TRUNC;
>+ }
>+
>+ return err;
>+}
>+
> static int
> vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
> int flags)
>@@ -2032,7 +2123,10 @@ vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
> goto out;
> }
>
>- err = __vsock_stream_recvmsg(sk, msg, len, flags);
>+ if (sk->sk_type == SOCK_STREAM)
>+ err = __vsock_stream_recvmsg(sk, msg, len, flags);
>+ else
>+ err = __vsock_seqpacket_recvmsg(sk, msg, len, flags);
>
> out:
> release_sock(sk);
The rest seems ok to me, but I need to get more familiar with SEQPACKET
before giving my R-b.
Thanks,
Stefano
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