Yeah, it's just to indicate that there are a variable number of "struct
ofp_queue_prop_header" elements that follow.
--Justin
> On Jun 3, 2015, at 8:30 PM, 林清祥 <woniu1...@gmail.com> wrote:
>
> I thought "struct ofp_queue_prop_header properties[0];" is to define a
> pointer of struct ofp_queue_prop_header.
>
> Thanks!
>
> 2015-06-04 11:27 GMT+08:00 Justin Pettit <jpet...@nicira.com>:
>>
>>> On Jun 3, 2015, at 8:16 PM, 林清祥 <woniu1...@gmail.com> wrote:
>>>
>>> I am reading openflow-spec-v1.3.0, and in page 37 there are a few codes as
>>> follow:
>>>
>>>> /* Full description for a queue. */
>>>> struct ofp_packet_queue {
>>>> uint32_t queue_id;
>>>> /* id for the specific queue. */
>>>> uint32_t port;
>>>> /* Port this queue is attached to. */
>>>> uint16_t len;
>>>> /* Length in bytes of this queue desc. */
>>>> uint8_t pad[6];
>>>> /* 64-bit alignment. */
>>>> struct ofp_queue_prop_header properties[0]; /* List of properties. */
>>>> };
>>>> OFP_ASSERT(sizeof(struct ofp_packet_queue) == 16);
>>>
>>> In my opinion, sizeof(struct ofp_packet_queue) = sizeof(queue_id) +
>>> sizeof(port) + sizeof(len) + sizeof(pad[]) + sizeof(properties) = 4 + 4 + 2
>>> + 6 + 4 = 20
>>>
>>> But the ASSERT is sizeof(struct ofp_packet_queue) == 16.
>>>
>>> Is there anyone can point out my misunderstanding?
>>
>> The "properties" element has zero elements, which has no length.
>>
>> --Justin
>
>
>
> --
>>
>> Thanks.
>>
>> Best Regards,
>>
>> Qingxiang Lin(林清祥)
>> ------
>> Graduate
>> College of Mathematics and Computer Science, FZU
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