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

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Date:	Thu, 7 Jul 2016 18:02:06 +0200
From:	Olaf Hering <olaf@...fle.de>
To:	Dexuan Cui <decui@...rosoft.com>
Cc:	"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>,
	"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>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	"joe@...ches.com" <joe@...ches.com>,
	Rolf Neugebauer <rolf.neugebauer@...ker.com>
Subject: Re: [PATCH v14 net-next 1/1] hv_sock: introduce Hyper-V Sockets

On Thu, Jun 30, Dexuan Cui wrote:

> +/* The MTU is 16KB per the host side's design. */
> +struct hvsock_recv_buf {
> +	unsigned int data_len;
> +	unsigned int data_offset;
> +
> +	struct vmpipe_proto_header hdr;
> +	u8 buf[PAGE_SIZE * 4];

Please use some macro related to the protocol rather than a Linux
compiletime macro.

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

Same here.

> + * Copyright(c) 2016, Microsoft Corporation. All rights reserved.

Here the BSD license follows. I think its required/desired to also
include a GPL blurb like it is done in many other files:
...
 * Alternatively, this software may be distributed under the terms of
 * the GNU General Public License ("GPL") version 2 as published by the
 * Free Software Foundation.
....

Otherwise the MODULE_LICENSE string might be incorrect.


> +	/* Hyper-V Sockets requires at least VMBus 4.0 */
> +	if ((vmbus_proto_version >> 16) < 4) {
> +		pr_err("failed to load: VMBus 4 or later is required\n");

I guess this mens WS 2016+, and loading in earlier host versions will
trigger this path? I think a silent ENODEV is enough.

> +		return -ENODEV;

Olaf

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