This patch creates two new helper functions, nxm_reg_load() and
nxm_dst_check(). The new nxm_dst_check() function may be used to
check the validity of destination fields used by actions. The new
nxm_reg_load() function may be used by actions which need to write
to NXM fields.
This patch also allows multipath and autopath to write their result
to non-register NXM fields.
Future patches will use nx_hash_fields for non-multipath related
actions. This patch renames nx_mp_fields and creates a new
flow_hash_fields() function.
The stricter validation requires updates to the calls to test-multipath
to supply a valid n_links value. test-multipath doesn't actually use
that value (it runs over different values in an internal "for" loop), so
this doesn't change any behavior.
Also adds a test to exercise each possible multipath_parse() error message.
Reported-by: Reid Price <reid@nicira.com>
Bug #4462.
0xffffffff / (0xffffffff / n) can have a value as large as n (consider the
n == 1 case), but we need a value no bigger than n-1. So add 1 before
dividing to fix the problem.
This caused a test failure on Debian "lenny" amd64 when apparently
unrelated code changed.
Reported-by: Justin Pettit <jpettit@nicira.com>
