From: Arseny Krasnov <arseny.krasnov@kaspersky.com>
To: Stefano Garzarella <sgarzare@redhat.com>
Cc: Stefan Hajnoczi <stefanha@redhat.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
Jason Wang <jasowang@redhat.com>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Jorgen Hansen <jhansen@vmware.com>,
Colin Ian King <colin.king@canonical.com>,
Norbert Slusarek <nslusarek@gmx.net>,
Andra Paraschiv <andraprs@amazon.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"virtualization@lists.linux-foundation.org"
<virtualization@lists.linux-foundation.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"stsp2@yandex.ru" <stsp2@yandex.ru>,
"oxffffaa@gmail.com" <oxffffaa@gmail.com>
Subject: Re: [RFC PATCH v9 04/19] af_vsock: implement SEQPACKET receive loop
Date: Thu, 13 May 2021 17:41:07 +0300 [thread overview]
Message-ID: <671fcc57-5288-804a-ac9a-c23a79cf3125@kaspersky.com> (raw)
In-Reply-To: <20210513113716.admtjzo5nt2y63qi@steredhat>
On 13.05.2021 14:37, Stefano Garzarella wrote:
> On Sat, May 08, 2021 at 07:33:14PM +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@kaspersky.com>
>> ---
>> v8 -> v9:
>> 1) 'tmp_record_len' renamed to 'fragment_len'.
>> 2) MSG_TRUNC handled in af_vsock.c instead of transport.
>> 3) 'flags' still passed to transport for MSG_PEEK support.
> Ah, right I see, sorry for the wrong suggestion to remove it.
>
>> include/net/af_vsock.h | 4 +++
>> net/vmw_vsock/af_vsock.c | 72 +++++++++++++++++++++++++++++++++++++++-
>> 2 files changed, 75 insertions(+), 1 deletion(-)
>>
>> diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h
>> index b1c717286993..5175f5a52ce1 100644
>> --- a/include/net/af_vsock.h
>> +++ b/include/net/af_vsock.h
>> @@ -135,6 +135,10 @@ struct vsock_transport {
>> bool (*stream_is_active)(struct vsock_sock *);
>> bool (*stream_allow)(u32 cid, u32 port);
>>
>> + /* SEQ_PACKET. */
>> + ssize_t (*seqpacket_dequeue)(struct vsock_sock *vsk, struct msghdr *msg,
>> + int flags, bool *msg_ready);
>> +
>> /* 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 c4f6bfa1e381..78b9af545ca8 100644
>> --- a/net/vmw_vsock/af_vsock.c
>> +++ b/net/vmw_vsock/af_vsock.c
>> @@ -1974,6 +1974,73 @@ 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;
>> + bool msg_ready;
>> + struct vsock_sock *vsk;
>> + ssize_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);
>> + msg_ready = false;
>> + record_len = 0;
>> +
>> + while (1) {
>> + ssize_t fragment_len;
>> +
>> + if (vsock_wait_data(sk, &wait, timeout, NULL, 0) <= 0) {
>> + /* In case of any loop break(timeout, signal
>> + * interrupt or shutdown), we report user that
>> + * nothing was copied.
>> + */
>> + err = 0;
>> + break;
>> + }
>> +
>> + fragment_len = transport->seqpacket_dequeue(vsk, msg, flags, &msg_ready);
>> +
> So, IIUC, seqpacket_dequeue() must return the real length,
> and not the bytes copied, right?
>
> I'm not sure virtio_transport_seqpacket_do_dequeue() is doing that.
> I'll post a comment on that patch.
Ok, i'll check it
>
>> + if (fragment_len < 0) {
>> + err = -ENOMEM;
>> + break;
>> + }
>> +
>> + record_len += fragment_len;
>> +
>> + if (msg_ready)
>> + break;
>> + }
>> +
>> + if (sk->sk_err)
>> + err = -sk->sk_err;
>> + else if (sk->sk_shutdown & RCV_SHUTDOWN)
>> + err = 0;
>> +
>> + if (msg_ready && err == 0) {
>> + /* User sets MSG_TRUNC, so return real length of
>> + * packet.
>> + */
>> + if (flags & MSG_TRUNC)
>> + err = record_len;
>> + else
>> + err = len - msg->msg_iter.count;
> I think is better to use msg_data_left(msg) instead of accessing fields.
Ack
>
>> +
>> + /* 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)
>> @@ -2029,7 +2096,10 @@ 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);
>> --
>> 2.25.1
>>
>
next prev parent reply other threads:[~2021-05-13 14:41 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-08 16:30 [RFC PATCH v9 00/19] virtio/vsock: introduce SOCK_SEQPACKET support Arseny Krasnov
2021-05-08 16:32 ` [RFC PATCH v9 01/19] af_vsock: update functions for connectible socket Arseny Krasnov
2021-05-08 16:32 ` [RFC PATCH v9 02/19] af_vsock: separate wait data loop Arseny Krasnov
2021-05-08 16:33 ` [RFC PATCH v9 03/19] af_vsock: separate receive " Arseny Krasnov
2021-05-08 16:33 ` [RFC PATCH v9 04/19] af_vsock: implement SEQPACKET receive loop Arseny Krasnov
2021-05-13 11:37 ` Stefano Garzarella
2021-05-13 14:41 ` Arseny Krasnov [this message]
2021-05-08 16:33 ` [RFC PATCH v9 05/19] af_vsock: implement send logic for SEQPACKET Arseny Krasnov
2021-05-08 16:33 ` [RFC PATCH v9 06/19] af_vsock: rest of SEQPACKET support Arseny Krasnov
2021-05-13 11:42 ` Stefano Garzarella
2021-05-08 16:34 ` [RFC PATCH v9 07/19] af_vsock: update comments for stream sockets Arseny Krasnov
2021-05-08 16:34 ` [RFC PATCH v9 08/19] virtio/vsock: set packet's type in virtio_transport_send_pkt_info() Arseny Krasnov
2021-05-08 16:34 ` [RFC PATCH v9 09/19] virtio/vsock: simplify credit update function API Arseny Krasnov
2021-05-08 16:35 ` [RFC PATCH v9 10/19] virtio/vsock: defines and constants for SEQPACKET Arseny Krasnov
2021-05-13 11:45 ` Stefano Garzarella
2021-05-13 14:42 ` Arseny Krasnov
2021-05-08 16:35 ` [RFC PATCH v9 11/19] virtio/vsock: dequeue callback for SOCK_SEQPACKET Arseny Krasnov
2021-05-13 11:58 ` Stefano Garzarella
2021-05-13 14:42 ` Arseny Krasnov
2021-05-13 12:18 ` Stefano Garzarella
2021-05-08 16:35 ` [RFC PATCH v9 12/19] virtio/vsock: add SEQPACKET receive logic Arseny Krasnov
2021-05-13 12:14 ` Stefano Garzarella
2021-05-13 14:43 ` Arseny Krasnov
2021-05-08 16:35 ` [RFC PATCH v9 13/19] virtio/vsock: rest of SOCK_SEQPACKET support Arseny Krasnov
2021-05-13 12:27 ` Stefano Garzarella
2021-05-13 13:03 ` Stefano Garzarella
2021-05-08 16:36 ` [RFC PATCH v9 14/19] virtio/vsock: enable SEQPACKET for transport Arseny Krasnov
2021-05-13 12:49 ` Stefano Garzarella
2021-05-13 14:44 ` Arseny Krasnov
2021-05-08 16:36 ` [RFC PATCH v9 15/19] vhost/vsock: " Arseny Krasnov
2021-05-13 13:44 ` Stefano Garzarella
2021-05-08 16:36 ` [RFC PATCH v9 16/19] vsock/loopback: " Arseny Krasnov
2021-05-08 16:37 ` [RFC PATCH v9 17/19] vsock_test: add SOCK_SEQPACKET tests Arseny Krasnov
2021-05-13 13:47 ` Stefano Garzarella
2021-05-08 16:37 ` [RFC PATCH v9 18/19] virtio/vsock: update trace event for SEQPACKET Arseny Krasnov
2021-05-08 16:37 ` [RFC PATCH v9 19/19] af_vsock: serialize writes to shared socket Arseny Krasnov
2021-05-13 14:01 ` Stefano Garzarella
2021-05-13 14:45 ` Arseny Krasnov
2021-05-13 14:46 ` Stefano Garzarella
2021-05-13 14:48 ` Arseny Krasnov
2021-05-13 15:41 ` Stefano Garzarella
2021-05-13 14:51 ` Arseny Krasnov
2021-05-13 14:10 ` [RFC PATCH v9 00/19] virtio/vsock: introduce SOCK_SEQPACKET support Stefano Garzarella
2021-05-13 14:46 ` Arseny Krasnov
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