[ovs-dev] [PATCHv9 09/12] datapath: Add support for unique flow identifiers.

[Ben Pfaff]

On Fri, Oct 31, 2014 at 04:55:43PM -0700, Joe Stringer wrote:
> If a datapath is created with the flag OVS_DP_F_INDEX_BY_UFID, then an
> additional table_instance is added to the flow_table, which is indexed
> by unique identifiers ("UFID"). Userspace implementations can specify a
> UFID of up to 128 bits along with a flow operation as shorthand for the
> key. This allows revalidation performance improvements of up to 50%.
> 
> If a datapath is created using OVS_DP_F_INDEX_BY_UFID and a UFID is not
> specified at flow setup time, then that operation will fail. If
> OVS_UFID_F_* flags are specified for an operation, then they will modify
> what is returned through the operation. For instance, OVS_UFID_F_SKIP_KEY
> allows the datapath to skip returning the key (eg, during dump to reduce
> memory copy).
> 
> Signed-off-by: Joe Stringer <joestringer at nicira.com>

As purely a naming issue, I believe that the UFID attributes with "skip"
in their names in this patch ask the kernel to leave things out of its
replies.  If so, to me, "omit" reads as a better term than "skip".