mbuf_eo_len16
len16 = mbuf_eo_len16(m0);
next_credits = mbuf_eo_len16(m);
KASSERT(credits >= mbuf_eo_len16(m),
cpl->credits, credits, mbuf_eo_len16(m)));
credits -= mbuf_eo_len16(m);
if (m != NULL && cst->tx_credits >= mbuf_eo_len16(m))