Re: [PATCH] pcnet32 compilation fix for 2.4.3pre6

Eli Carter
2001-03-22T15:12:10Z

Jeff Garzik wrote:
>
> Eli Carter wrote:
> > The "!(addr[0]&1)" part of the test already catches the ff's case, so
> > that is redundant.
> > Using 6 bytes instead of 7 is an improvement.
>
> oops. Thanks, updated patch attached. My patch also adds inline source
> docs, and uses 'static inline' instead of 'static __inline__', two small
> style improvements.

Mmmm.... documentation. Yummy. ;)

When I submitted the original patch, someone wanted to add the ff's
check as well... to reduce the number of people who make that
suggestion, perhaps the comment should read:

+ * Check that the Ethernet address (MAC) is not a multicast address or
+ * FF:FF:FF:FF:FF:FF (by checking addr[0]&1) and is not
00:00:00:00:00:00.
+ *

Does that make it clear that both cases are covered by the one test?

Hmm... I used __inline__ because the other function in the same
headerfile used it... What is the difference between the two, and is
one depricated now? (And what about in 2.2.x?)

Eli

> ------------------------------------------------------------------------
> Index: include/linux/etherdevice.h
> ===================================================================
> RCS file: /cvsroot/gkernel/linux_2_4/include/linux/etherdevice.h,v
> retrieving revision 1.1.1.14.4.2
> diff -u -r1.1.1.14.4.2 etherdevice.h
> --- include/linux/etherdevice.h 2001/03/21 14:10:50 1.1.1.14.4.2
> +++ include/linux/etherdevice.h 2001/03/22 14:44:51
> @@ -46,6 +46,22 @@
> memcpy (dest->data, src, len);
> }
>
> +/**
> + * is_valid_ether_addr - Determine if the given Ethernet address is valid
> + * @addr: Pointer to a six-byte array containing the Ethernet address
> + *
> + * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not
> + * a multicast address, and is not FF:FF:FF:FF:FF:FF.
> + *
> + * Return true if the address is valid.
> + */
> +static inline int is_valid_ether_addr( u8 *addr )
> +{
> + const char zaddr[6] = {0,};
> +
> + return !(addr[0]&1) && memcmp( addr, zaddr, 6);
> +}
> +
> #endif
>
> #endif /* _LINUX_ETHERDEVICE_H */
-----------------------. Rule of Accuracy: When working toward
Eli Carter | the solution of a problem, it always
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