HOSTCC_FLOW_ATTN_MBUF_LWM
val = (val & HOSTCC_FLOW_ATTN_MBUF_LWM) ? 1 : 0;
tw32(HOSTCC_FLOW_ATTN, HOSTCC_FLOW_ATTN_MBUF_LWM);
if (val & ~HOSTCC_FLOW_ATTN_MBUF_LWM) {