ENETC_RXB_TRUESIZE
size_t buffer_size = ENETC_RXB_TRUESIZE - rx_ring->buffer_offset;
rx_swbd->page_offset ^= ENETC_RXB_TRUESIZE;
skb = build_skb(ba - rx_ring->buffer_offset, ENETC_RXB_TRUESIZE);
rx_swbd->page_offset, size, ENETC_RXB_TRUESIZE);
xdp_init_buff(xdp_buff, ENETC_RXB_TRUESIZE, &rx_ring->xdp.rxq);
ENETC_RXB_TRUESIZE);
min(SKB_WITH_OVERHEAD(ENETC_RXB_TRUESIZE) - ENETC_RXB_PAD, 0xffff)
min(SKB_WITH_OVERHEAD(ENETC_RXB_TRUESIZE) - XDP_PACKET_HEADROOM, 0xffff)