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odp-util: Clear padding in the nd_extension.
Silimar to the patch 67eb811 ("odp-util: Fix passing uninitialized bytes in OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV*.") when change from flow into the netlink format, the tail padding of nd_extension should be cleared. this fixes the following warning logs: |ofproto_dpif_upcall(pmd-...)|WARN|Conflicting ukey for flows: ufid:763c7d3b-4d0c-4bff-aafc-fdfb6089c2ba <...>,eth(...),eth_type(0x86dd),ipv6(...),icmpv6(type=135,code=0),\ nd(target=fdbd:dc02:ff:1:1::1,sll=fa:16:3e:75:b3:a9,tll=00:00:00:00:00:00),\ nd_ext(nd_reserved=0x0,nd_options_type=1) ufid:763c7d3b-4d0c-4bff-aafc-fdfb6089c2ba <...>,eth(...),eth_type(0x86dd),ipv6(...),icmpv6(type=135,code=0),\ nd(target=fdbd:dc02:ff:1:1::1,sll=fa:16:3e:75:b3:a9,tll=00:00:00:00:00:00),\ nd_ext(nd_reserved=0x0,nd_options_type=1) |ofproto_dpif_upcall(pmd-...)|WARN|upcall_cb failure: ukey installation fails Fixes: 9b2b849 ("Support for match & set ICMPv6 reserved and options type fields") Signed-off-by: Peng He <hepeng.0320@bytedance.com> Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
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