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Subject: Re: [PATCH 4/5] af_vsock: add socket ops for SOCK_SEQPACKET.
To:     Arseny Krasnov <arseny.krasnov@kaspersky.com>,
        Stefan Hajnoczi <stefanha@redhat.com>,
        Stefano Garzarella <sgarzare@redhat.com>,
        "Michael S. Tsirkin" <mst@redhat.com>,
        Jason Wang <jasowang@redhat.com>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Andra Paraschiv <andraprs@amazon.com>,
        Jorgen Hansen <jhansen@vmware.com>,
        Arseniy Krasnov <oxffffaa@gmail.com>,
        Colin Ian King <colin.king@canonical.com>,
        Jeff Vander Stoep <jeffv@google.com>
Cc:     kvm@vger.kernel.org, virtualization@lists.linux-foundation.org,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20210103195454.1954169-1-arseny.krasnov@kaspersky.com>
 <20210103200421.1956545-1-arseny.krasnov@kaspersky.com>
From:   stsp <stsp2@yandex.ru>
Message-ID: <f790ca57-cec9-4884-c8e5-bf8806364dd7@yandex.ru>
Date:   Mon, 4 Jan 2021 00:15:53 +0300
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03.01.2021 23:04, Arseny Krasnov пишет:
> From: Arseniy Krasnov <oxffffaa@gmail.com>
>
> ---
>   net/vmw_vsock/af_vsock.c | 107 +++++++++++++++++++++++++++++++++------
>   1 file changed, 91 insertions(+), 16 deletions(-)
>
> diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
> index 7ff00449a9a2..30caad9815f7 100644
> --- a/net/vmw_vsock/af_vsock.c
> +++ b/net/vmw_vsock/af_vsock.c
> @@ -452,6 +452,7 @@ int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk)
>   		new_transport = transport_dgram;
>   		break;
>   	case SOCK_STREAM:
> +	case SOCK_SEQPACKET:
>   		if (vsock_use_local_transport(remote_cid))
>   			new_transport = transport_local;
>   		else if (remote_cid <= VMADDR_CID_HOST || !transport_h2g ||
> @@ -459,6 +460,12 @@ int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk)
>   			new_transport = transport_g2h;
>   		else
>   			new_transport = transport_h2g;
> +
> +		if (sk->sk_type == SOCK_SEQPACKET) {
> +			if (!new_transport->seqpacket_seq_send_len ||
> +			    !new_transport->seqpacket_seq_get_len)
> +				return -ENODEV;

Is ENODEV the right error here?
Just a quick look at a man page, and
I am under impression something like
EPROTONOSUPPORT or ESOCKNOSUPPORT
may suit?