netdev - Re: [PATCH 2/3] vsockmon: Add vsockmon device.

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Date:	Fri, 12 Aug 2016 16:17:23 +0200
From:	Gerard Garcia <ggarcia@...a.uab.cat>
To:	Stefan Hajnoczi <stefanha@...hat.com>
Cc:	netdev@...r.kernel.org, jhansen@...are.com, mst@...hat.com
Subject: Re: [PATCH 2/3] vsockmon: Add vsockmon device.

On 08/10/2016 01:51 PM, Stefan Hajnoczi wrote:
> On Mon, Aug 08, 2016 at 06:14:41PM +0200, ggarcia@...a.uab.cat wrote:
>> diff --git a/include/uapi/linux/vsockmon.h b/include/uapi/linux/vsockmon.h
>> new file mode 100644
>> index 0000000..739b4bf
>> --- /dev/null
>> +++ b/include/uapi/linux/vsockmon.h
>> @@ -0,0 +1,35 @@
>> +#ifndef _UAPI_VSOCKMON_H
>> +#define _UAPI_VSOCKMON_H
>> +
>> +#include <linux/virtio_vsock.h>
>> +
>> +/* Structure of packets received trought the vsockmon device. */
>> +
>> +struct af_vsockmon_hdr {
>> +	__le64 src_cid;
>> +	__le64 dst_cid;
>> +	__le32 src_port;
>> +	__le32 dst_port;
>> +	__le16 op;			/* enum af_vsockmon_op */
>> +	__le16 t;			/* enum af_vosckmon_t */
>> +	__le16 len;			/* sizeof(t_hdr) */
>> +	union {
>> +		struct virtio_vsock_hdr virtio_hdr;
>> +	} t_hdr;
>> +} __attribute__((packed));
>
> This struct will change in size if/when VMCI transport support is added.
> Existing binaries that were complied against the old header file would
> use an incorrect size.
>
> It would be cleaner to drop t_hdr from the struct and force users to
> explicitly use af_vsockmon_hdr.len to handle the size of the headers.
>

Ok, I'll remove the t_hdr union and put a comment explaining that after 
the vsockmon header there are len bytes of the transport header.