The flowid and hashtype should be copied from the originating packet

when fragmenting IP packets to preserve the order of the packets in a
stream. Else the resulting fragments can be sent out of order when the
hardware supports multiple transmit rings.

Reviewed by:	glebius @
MFC after:	1 week
Sponsored by:	Mellanox Technologies

sys/netinet/ip_output.c

@@ -789,6 +789,10 @@ ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
 			IPSTAT_INC(ips_odropped);
 			goto done;
 		}
+		/* make sure the flowid is the same for the fragmented mbufs */
+		M_HASHTYPE_SET(m, M_HASHTYPE_GET(m0));
+		m->m_pkthdr.flowid = m0->m_pkthdr.flowid;
+		/* copy multicast flag, if any */
 		m->m_flags |= (m0->m_flags & M_MCAST);
 		/*
 		 * In the first mbuf, leave room for the link header, then