netdev - Re: [PATCH v14 net-next 1/1] hv_sock: introduce Hyper-V Sockets

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Date:	Tue, 05 Jul 2016 01:21:54 -0700
From:	Joe Perches <joe@...ches.com>
To:	Dexuan Cui <decui@...rosoft.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"apw@...onical.com" <apw@...onical.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	Vitaly Kuznetsov <vkuznets@...hat.com>,
	Cathy Avery <cavery@...hat.com>,
	KY Srinivasan <kys@...rosoft.com>
Cc:	Haiyang Zhang <haiyangz@...rosoft.com>,
	Rolf Neugebauer <rolf.neugebauer@...ker.com>
Subject: Re: [PATCH v14 net-next 1/1] hv_sock: introduce Hyper-V Sockets

On Thu, 2016-06-30 at 15:58 +0000, Dexuan Cui wrote:
> Hyper-V Sockets (hv_sock) supplies a byte-stream based communication
> mechanism between the host and the guest. It's somewhat like TCP over
> VMBus, but the transportation layer (VMBus) is much simpler than IP.

trivia:

> diff --git a/include/net/af_hvsock.h b/include/net/af_hvsock.h
[]
> @@ -0,0 +1,59 @@
[]
> +#define sk_to_hvsock(__sk)   ((struct hvsock_sock *)(__sk))
> +#define hvsock_to_sk(__hvsk) ((struct sock *)(__hvsk))

Might as well be static inlines

> +/* We send at most 4KB payload per VMBus packet. */
> +struct hvsock_send_buf {
> +	struct vmpipe_proto_header hdr;
> +	u8 buf[PAGE_SIZE];

PAGE_SIZE might not be the right define here if
the comment is to be believed.

> diff --git a/include/uapi/linux/hyperv.h b/include/uapi/linux/hyperv.h
[]
> @@ -396,4 +397,27 @@ struct hv_kvp_ip_msg {
>  	struct hv_kvp_ipaddr_value      kvp_ip_val;
>  } __attribute__((packed));
>  
> +/* This is the address fromat of Hyper-V Sockets.

format

> diff --git a/net/hv_sock/af_hvsock.c b/net/hv_sock/af_hvsock.c
[]
> @@ -0,0 +1,1519 @@
> +/*
> + * Hyper-V Sockets -- a socket-based communication channel between the
> + * Hyper-V host and the virtual machines running on it.
> + *
> + * Copyright(c) 2016, Microsoft Corporation. All rights reserved.
> + *
> + * Redistribution and use in source and binary forms, with or without
> + * modification, are permitted provided that the following conditions
> + * are met:
> + *
> + * 1. Redistributions of source code must retain the above copyright
> + *    notice, this list of conditions and the following disclaimer.
> + * 2. Redistributions in binary form must reproduce the above copyright
> + *    notice, this list of conditions and the following disclaimer in the
> + *    documentation and/or other materials provided with the distribution.
> + * 3. The name of the author may not be used to endorse or promote
> + *    products derived from this software without specific prior written
> + *    permission.
> + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
> + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
> + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
> + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
> + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
> + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
> + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
> + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
> + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
> + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
> + * POSSIBILITY OF SUCH DAMAGE.
> + */

Is this license GPL compatible?

> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> +
> +#include 
> +#include 
> +#include 
> +#include 
> +
> +static struct proto hvsock_proto = {
> +	.name = "HV_SOCK",
> +	.owner = THIS_MODULE,
> +	.obj_size = sizeof(struct hvsock_sock),
> +};
	
const?

> +static int hvsock_recvmsg_wait(struct sock *sk, struct msghdr *msg,
> +			       size_t len, int flags)
> +{
[]
> +				if (ret != 0 || payload_len >
> +						sizeof(hvsk->recv->buf)) {

This could look nicer as

				if (ret != 0 ||
				    payload_len > sizeof(hvsk->recv->buf)) {