[PATCH] ixp4xx: Support the all multicast flag on the NPE devices.
Krzysztof Halasa
khc at pm.waw.pl
Mon May 31 12:23:37 EDT 2010
Mikael Pettersson <mikpe at it.uu.se> writes:
> > + static const u8 allmulti[] = { 0x01, 0x00, 0x00, 0x00, 0x00, 0x00 };
> > +
> > + if (dev->flags & IFF_ALLMULTI) {
> > + for (i = 0; i < ETH_ALEN; i++) {
> > + __raw_writel(allmulti[i], &port->regs->mcast_addr[i]);
> > + __raw_writel(allmulti[i], &port->regs->mcast_mask[i]);
>
> Seems a bit excessive to define a lookup table for a computation
> that amounts to nothing more than "i ? 0 : 1".
>
> Something like the following would IMO be cleaner:
>
> if (...) {
> for (...) {
> u8 multi = i ? 0x00 : 0x01;
> __raw_writel(multi, ...);
> ...
> }
> }
Well... cleaner = easier to understand?
I don't think so, the array is clearly a MAC address (mask) and the
"i ? 0x00 : 0x01" (which one could simply write as "!i") requires some
additional attention.
It's a slow "admin" path so an unmeasurable speedup doesn't mean
anything.
--
Krzysztof Halasa
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