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Date:   Sat, 21 Jan 2023 11:22:31 -0800
From:   Cong Wang <xiyou.wangcong@gmail.com>
To:     Bobby Eshleman <bobby.eshleman@bytedance.com>
Cc:     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>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Martin KaFai Lau <martin.lau@linux.dev>,
        Song Liu <song@kernel.org>, Yonghong Song <yhs@fb.com>,
        John Fastabend <john.fastabend@gmail.com>,
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        Stanislav Fomichev <sdf@google.com>,
        Hao Luo <haoluo@google.com>, Jiri Olsa <jolsa@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: <Y8w7d+6UASP3jUHf@pop-os.localdomain>
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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In-Reply-To: <20230118-support-vsock-sockmap-connectible-v1-1-d47e6294827b@bytedance.com>
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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.