On Thu, Jan 10, 2013 at 03:37:37PM -0800, Romain Lenglet wrote:
> On Jan 9, 2013, at 4:00 PM, Ben Pfaff <b...@nicira.com> wrote:
> > It looks like, in practice, the arguments to
> > ipfix_define_template_entity() are always fixed at compile time. If
> > I'm reading the code correctly, then this means that each call to
> > ipfix_define_template_entity() is going through a "switch" statement
> > to find out a couple of values whose values could actually be fixed at
> > compile time. So, how about something like this, instead:
> >
> > - at top level, add:
> >
> > enum ipfix_entity_size {
> > #define IPFIX_ENTITY(ENUM, ID, SIZE, NAME) IPFIX_ENTITY_SIZE_##ENUM,
> > #include "ofproto/ipfix-entities.def"
> > };
> >
> > - Change ipfix_define_template_entity() to just:
> >
> > static void
> > ipfix_define_template_entity(enum ipfix_entity_id id, int size,
> > struct ofpbuf *msg)
> > {
> > struct ipfix_template_field_specifier *field;
> >
> > field = ofpbuf_put_zeros(msg, sizeof *field);
> > field->element_id = htons(id);
> > field->field_length = htons(size);
> > }
> >
> > - Change DEF to just:
> >
> > #define DEF(ID) \
> > { \
> > ipfix_define_template_entity(IPFIX_ENTITY_ID_##ID, \
> > IPFIX_ENTITY_SIZE_##ID, msg); \
> > count++; \
> > }
> >
> > and thereby avoid runtime work for what we know at compile time.
>
> How would that work?
> Nothing uses the SIZE argument of the IPFIX_ENTITY in your code
> above, and you're using the enum value in place of the size, which
> seems incorrect.
Oops, my definition was wrong. Here's a corrected (but I didn't
build-test this version as I did the previous one):
#define IPFIX_ENTITY(ENUM, ID, SIZE, NAME) \
enum { IPFIX_ENTITY_SIZE_##ENUM = SIZE };
#include "ofproto/ipfix-entities.def"
Unless I'm missing something again, the value of
IPFIX_ENTITY_SIZE_<field> is the size of <field>, so it should work
out OK.
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