On Jun 28, 2013, at 4:43 , ext Jesse Gross wrote:
> It's a validation limitation: if you have a vlan packet then you need
> to have an exact match on a corresponding EtherType. If you only want
> to match on the Ethernet header then it's fully maskable.
>
On OpenFlow (& meta-flow etc.) ethertype is "unmaskable" i.e. only full mask is
supported.
So even if kernel now allows bitwise masking, such masks are not generated.
Jarno
> On Thu, Jun 27, 2013 at 6:30 PM, Ethan Jackson <et...@nicira.com> wrote:
>> Is the lack of support for bitwise masking if the ethertype a kernel
>> limitation or a userspace one? If it's a userspace limitation I think
>> we should handle the case where it could be bitwise. If it's a kernel
>> limitation, I think the current patch is fine.
>>
>> Acked-by: Ethan Jackson <et...@nicira.com>
>>
>> On Thu, Jun 27, 2013 at 6:16 PM, Justin Pettit <jpet...@nicira.com> wrote:
>>> When converting the VLAN from a flow to an ODP key, the processing logic
>>> would always store the VLAN ethertype. However, when handling a mask,
>>> it should be a mask, not an ethertype. And since we don't support
>>> bit-wise masking of the ethertype, just make it an exact-match mask.
>>>
>>> Signed-off-by: Justin Pettit <jpet...@nicira.com>
>>> ---
>>> lib/odp-util.c | 6 +++++-
>>> 1 files changed, 5 insertions(+), 1 deletions(-)
>>>
>>> diff --git a/lib/odp-util.c b/lib/odp-util.c
>>> index 7724be4..5be8118 100644
>>> --- a/lib/odp-util.c
>>> +++ b/lib/odp-util.c
>>> @@ -2285,7 +2285,11 @@ odp_flow_key_from_flow__(struct ofpbuf *buf, const
>>> struct flow *data,
>>> memcpy(eth_key->eth_dst, data->dl_dst, ETH_ADDR_LEN);
>>>
>>> if (flow->vlan_tci != htons(0) || flow->dl_type == htons(ETH_TYPE_VLAN))
>>> {
>>> - nl_msg_put_be16(buf, OVS_KEY_ATTR_ETHERTYPE, htons(ETH_TYPE_VLAN));
>>> + if (is_mask) {
>>> + nl_msg_put_be16(buf, OVS_KEY_ATTR_ETHERTYPE,
>>> htons(UINT16_MAX));
>>> + } else {
>>> + nl_msg_put_be16(buf, OVS_KEY_ATTR_ETHERTYPE,
>>> htons(ETH_TYPE_VLAN));
>>> + }
>>> nl_msg_put_be16(buf, OVS_KEY_ATTR_VLAN, data->vlan_tci);
>>> encap = nl_msg_start_nested(buf, OVS_KEY_ATTR_ENCAP);
>>> if (flow->vlan_tci == htons(0)) {
>>> --
>>> 1.7.5.4
>>>
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