Re: Disabling VLAN_HWTAGGING

From: Jacob S. Barrett (jbarrett_at_amduat.net)
Date: 03/27/04

  • Next message: Ruslan Ermilov: "Re: Disabling VLAN_HWTAGGING" 
    To: Ruslan Ermilov <ru@freebsd.org>
Date: Fri, 26 Mar 2004 18:44:52 -0800

    I did a little more debugging and placed some printf statements before and
    after:
                    /*
                     * If we received a packet with a vlan tag, pass it
                     * to vlan_input() instead of ether_input().
                     */
                    if (extsts & NGE_RXEXTSTS_VLANPKT) {
                            VLAN_INPUT_TAG(ifp, m,
                                    extsts & NGE_RXEXTSTS_VTCI, continue);
                    }

    What I found is that VLAN tagged frames sent to the interface never get to
    this line at all. I figured the NIC must be droping it or something before
    it even gets to the driver. So I commented out the following line:
            /*
             * Tell the chip to detect and strip VLAN tag info from
             * received frames. The tag will be provided in the extsts
             * field in the RX descriptors.
             */
            NGE_SETBIT(sc, NGE_VLAN_IP_RXCTL,
                NGE_VIPRXCTL_TAG_DETECT_ENB|NGE_VIPRXCTL_TAG_STRIP_ENB);

    Now the driver gets the frame but the conditional about is false, presumable
    because I comment out that line which says it will detect and set the extsts.
    It does however get delivered to the ng lower hook and therefor the ng_vlan
    gets it. The ng_eiface tied to vlan2 replies to the arp requests. Strangely
    though when an ICMP ping request gets to ng_eiface it ignores it.

    02:27:16.658526 0:90:27:f4:58:1d ff:ff:ff:ff:ff:ff 0806 56: arp who-has
    10.2.0.1 tell 10.2.0.2
    02:27:16.658633 11:22:33:44:55:66 0:90:27:f4:58:1d 0806 42: arp reply 10.2.0.1
    is-at 11:22:33:44:55:66
    02:27:16.659132 0:90:27:f4:58:1d 11:22:33:44:55:66 0800 98: 10.2.0.2 >
    10.2.0.1: icmp: echo request
    02:27:16.664321 0:90:27:f4:58:1d 11:22:33:44:55:66 0800 98: 10.2.0.2 >
    10.2.0.1: icmp: echo request

    Even more odd, I can ping from the ng_eiface interface and it makes it tagged
    all the way out and back just fine. The ng_eiface gets the ICMP response just
    fine.

    Does any of this make sense to you? Is there possibly something wrong with
    the logic in that detect and stip flag? Am I just a total tool and missing
    someting completely obvious here, because it wouldn't be the first time.

    Does anyone have a 1Gbit fiber NIC that they have tested in and out with VLAN
    tagging that they could recommend. 

    -- 
Jacob S. Barrett
jbarrett@amduat.net
www.amduat.net
"I don't suffer from insanity, I enjoy every minute of it."
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  • Next message: Ruslan Ermilov: "Re: Disabling VLAN_HWTAGGING"

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