- snap = (rx_ev_pkt_type == RX_EV_PKT_TYPE_LLC_DECODE) ||
- (rx_ev_pkt_type == RX_EV_PKT_TYPE_VLAN_LLC_DECODE);
- non_ip = (rx_ev_hdr_type == RX_EV_HDR_TYPE_NON_IP_DECODE);
-
- /* SFC bug 5475/8970: The Falcon XMAC incorrectly calculates the
- * length field of an LLC frame, which sets TOBE_DISC. We could set
- * PASS_LEN_ERR, but we want the MAC to filter out short frames (to
- * protect the RX block).
- *
- * bug5475 - LLC/SNAP: Falcon identifies SNAP packets.
- * bug8970 - LLC/noSNAP: Falcon does not provide an LLC flag.
- * LLC can't encapsulate IP, so by definition
- * these packets are NON_IP.
- *
- * Unicast mismatch will also cause TOBE_DISC, so the driver needs
- * to check this.
- */
- if (EFX_WORKAROUND_5475(efx) && rx_ev_tobe_disc && (snap || non_ip)) {
- /* If all the other flags are zero then we can state the
- * entire packet is ok, which will flag to the kernel not
- * to recalculate checksums.
- */
- if (!(non_ip | rx_ev_other_err | rx_ev_pause_frm))
- *rx_ev_pkt_ok = 1;
-
- rx_ev_tobe_disc = 0;
-
- /* TOBE_DISC is set for unicast mismatch. But given that
- * we can't trust TOBE_DISC here, we must validate the dest
- * MAC address ourselves.
- */
- if (!rx_ev_mcast_pkt && !check_dest_mac(rx_queue, event))
- rx_ev_tobe_disc = 1;
- }
-