On May 8, 2013, at 11:13 , ext Rajahalme, Jarno (NSN - FI/Espoo) wrote:
>>
>> old_rule = insert_rule(cls, table, rule);
>> if (!old_rule) {
>> + if (minimask_get_metadata_mask(&rule->match.mask) == OVS_BE64_MAX) {
>> + ovs_be64 metadata = miniflow_get_metadata(&rule->match.flow);
>> + rule->partition = create_partition(cls, table, metadata);
>
> I guess that Andy's comment on masked metadata support would be a
> generalization to this, where the metadata mask would be made part of the
> cls_partition, and the hmap would be keyed by the combination of the (masked)
> metadata and the mask. It would be pretty straightforward, but would be a bit
> more work. With this generalization this part would look like something like
> this:
>
> ovs_be64 metadata_mask =
> minimask_get_metadata_mask(&rule->match.mask);
> if (metadata_mask) {
> ovs_be64 metadata = miniflow_get_metadata(&rule->match.flow);
> rule->partition = create_partition(cls, table, metadata,
> metadata_mask);
>
> Corresponding changes would be needed elsewhere.
>
> I have no idea of the performance impact, though.
>
Just came to think that on lookup this would need a separate find_partition()
call for each table (with the table's metadata mask), which would not be very
efficient. So, unless there is a use case that would benefit from the masked
metadata partitioning, it likely would not be worth the additional cost.
Jarno
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