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

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Date:	Fri, 8 Jul 2016 07:01:58 +0000
From:	Dexuan Cui <decui@...rosoft.com>
To:	Olaf Hering <olaf@...fle.de>
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

> From: Olaf Hering [mailto:olaf@...fle.de]
> Sent: Friday, July 8, 2016 0:02
> 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.
OK. I'll fix this.
 
> > +/* We send at most 4KB payload per VMBus packet. */
> > +struct hvsock_send_buf {
> > +	struct vmpipe_proto_header hdr;
> > +	u8 buf[PAGE_SIZE];
> 
> Same here.
OK. I'll fix this.

> > + * 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.
I'll add the GPL blurb.
 
> > +	/* 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.
Yes. 
OK, I'll remove the pr_err().

> 
> > +		return -ENODEV;
> 
> Olaf

I'll post v15 shortly, which will address all the comments from Joe and Olaf.

Thanks,
-- Dexuan