Symbol: EXT_RXRING
sys/kern/kern_mbuf.c
1200
m->m_ext.ext_type == EXT_RXRING,
sys/kern/kern_mbuf.c
1245
case EXT_RXRING:
sys/net/pfil.c
130
m_extadd(&m, mem, len, NULL, NULL, NULL, 0, EXT_RXRING);