BGMAC_DESC_CTL1_LEN
ctl1 = len & BGMAC_DESC_CTL1_LEN;
if (skb->len > BGMAC_DESC_CTL1_LEN) {
int len = ctl1 & BGMAC_DESC_CTL1_LEN;
len = ctl1 & BGMAC_DESC_CTL1_LEN;
ctl1 |= BGMAC_RX_BUF_SIZE & BGMAC_DESC_CTL1_LEN;
unsigned int len = ctl1 & BGMAC_DESC_CTL1_LEN;