m_get2
m = m_get2(len, M_NOWAIT, MT_DATA, M_PKTHDR);
m = m_get2(required_size, M_NOWAIT, MT_DATA, M_PKTHDR);
struct mbuf* m_get2(int size, int how, short type, int flags);
mb = m_get2(length, 0, MT_DATA, M_PKTHDR);
m = m_get2(fragsize, IEEE80211_M_NOWAIT, MT_DATA, M_PKTHDR);