FBNIC_RX_PAD
rcq_ctl |= FIELD_PREP(FBNIC_QUEUE_RDE_CTL1_PADLEN_MASK, FBNIC_RX_PAD) |
headroom = hdr_pg_off - hdr_pg_start + FBNIC_RX_PAD;
len - FBNIC_RX_PAD, true);
(4096 - FBNIC_RX_HROOM - FBNIC_RX_TROOM - FBNIC_RX_PAD)
(1536 - FBNIC_RX_PAD)