bonding: permit using arp_validate with non-ab modes
Currently it's disabled because it's sometimes hard, in typical configs, to make it work - because of the nature how the loadbalance modes work - as it's hard to deliver valid arp replies to correct slaves by the switch. However we still can use arp_validation in loadbalance with several other configs, per example with arp_validate == 2 for backup with one broadcast domain, without the switch(es) doing any balancing - this way we'd be (a bit more) sure that the slave is up. So, enable it to let users decide which one works/suits them best. Also correct the mode limitation from BOND_OPT_ARP_VALIDATE. CC: Nikolay Aleksandrov <nikolay@redhat.com> CC: Jay Vosburgh <fubar@us.ibm.com> CC: Andy Gospodarek <andy@greyhouse.net> Signed-off-by: Veaceslav Falico <vfalico@redhat.com> Acked-by: Nikolay Aleksandrov <nikolay@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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