On Jul 15, 2014, at 2:24 PM, Ben Pfaff <b...@nicira.com> wrote:
> On Fri, Jul 11, 2014 at 04:55:56AM -0700, Jarno Rajahalme wrote:
>> Previously we only returned the last matching prefix length
>> encountered during a trie lookup, and skipped subtables that had
>> prefixes longer than that. This patch changes the trie lookup
>> functions to return all matching prefix lengths seen, so that all
>> non-matching prefix lengths can be skipped.
>>
>> Signed-off-by: Jarno Rajahalme <jrajaha...@nicira.com>
>
> Here, should the comment on match_plens be something more like
> "Prefixes that could possible match.”?
You are right, I forgot to update the comment. It is now a bitmask, one bit for
each potentially matching prefix length. Each bit indicates one prefix length
with potential matches, what do you think of this:
“Bitmask of prefix lengths with possible matches.”
Jarno
> struct trie_ctx {
> const struct cls_trie *trie;
> bool lookup_done; /* Status of the lookup. */
> uint8_t be32ofs; /* U32 offset of the field in question. */
> - unsigned int match_plen; /* Longest prefix than could possibly match. */
> unsigned int maskbits; /* Prefix length needed to avoid false matches.
> */
> + union mf_value match_plens; /* Longest prefix than could possibly match.
> */
> };
>
> Acked-by: Ben Pfaff <b...@nicira.com>
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