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Date:   Thu, 19 Jan 2023 03:47:02 +0000
From:   Bobby Eshleman <bobbyeshleman@gmail.com>
To:     Cong Wang <xiyou.wangcong@gmail.com>
Cc:     Bobby Eshleman <bobby.eshleman@bytedance.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>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Andrii Nakryiko <andrii@kernel.org>,
        Mykola Lysenko <mykolal@fb.com>,
        Alexei Starovoitov <ast@kernel.org>,
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        Song Liu <song@kernel.org>, Yonghong Song <yhs@fb.com>,
        John Fastabend <john.fastabend@gmail.com>,
        KP Singh <kpsingh@kernel.org>,
        Stanislav Fomichev <sdf@google.com>,
        Hao Luo <haoluo@google.com>, Jiri Olsa <jolsa@kernel.org>,
        Shuah Khan <shuah@kernel.org>, linux-kernel@vger.kernel.org,
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        netdev@vger.kernel.org, bpf@vger.kernel.org,
        linux-kselftest@vger.kernel.org,
        Cong Wang <cong.wang@bytedance.com>
Subject: Re: [PATCH RFC 1/3] vsock: support sockmap
Message-ID: <Y8i9NlRpIR/KE/q2@bullseye>
References: <20230118-support-vsock-sockmap-connectible-v1-0-d47e6294827b@bytedance.com>
 <20230118-support-vsock-sockmap-connectible-v1-1-d47e6294827b@bytedance.com>
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On Sat, Jan 21, 2023 at 11:22:31AM -0800, Cong Wang wrote:
> On Wed, Jan 18, 2023 at 12:27:39PM -0800, Bobby Eshleman wrote:
> > +static int vsock_read_skb(struct sock *sk, skb_read_actor_t read_actor)
> > +{
> > +	struct vsock_sock *vsk = vsock_sk(sk);
> > +
> > +	if (!vsk->transport)
> > +		return -ENODEV;
> > +
> > +	if (!vsk->transport->read_skb)
> > +		return -EOPNOTSUPP;
> 
> Can we move these two checks to sockmap update path? It would make
> vsock_read_skb() faster.
> 
> > +
> > +	return vsk->transport->read_skb(vsk, read_actor);
> > +}
> 
> Essentially can be just this one line.
> 
> Thanks.

That makes sense, will do.

Thanks,
Bobby