ovs/lib/match.c
/* For each bit or field wildcarded in 'match', sets the corresponding bit or
 * field in 'flow' to all-0-bits.  It is important to maintain this invariant
 * in a match that might be inserted into a classifier.
 *
 * It is never necessary to call this function directly for a match that is
 * initialized or modified only by match_*() functions.  It is useful to
 * restore the invariant in a match whose 'wc' member is modified by hand.
 */
For each bit or field wildcarded in 'match', sets the corresponding bit or
field in 'flow' to all-0-bits.  It is important to maintain this invariant
in a match that might be inserted into a classifier.

It is never necessary to call this function directly for a match that is
initialized or modified only by match_*() functions.  It is useful to
restore the invariant in a match whose 'wc' member is modified by hand.
For each bit or field wildcarded in ' match ' sets the corresponding bit or field in ' flow ' to all - 0 - bits . It is important to maintain this invariant in a match that might be inserted into a classifier . It is never necessary to call this function directly for a match that is initialized or modified only by match_ * () functions . It is useful to restore the invariant in a match whose ' wc ' member is modified by hand .
void
match_zero_wildcarded_fields(struct match *match)
{
    flow_zero_wildcards(&match->flow, &match->wc);
}
void match_zero_wildcarded_fields ( struct match * match ) { flow_zero_wildcards ( & match -> flow , & match -> wc ) ; }
For each bit or field wildcarded in 'match', sets the corresponding bit or
 field in 'flow' to all-0-bits.
For each bit or field wildcarded in ' match ' sets the corresponding bit or field in ' flow ' to all - 0 - bits .