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SubjectRe: [PATCH] ARM: dts: BCM5301X: Add support for Linksys EA9500
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On 08/13/2017 09:44 PM, Vivek Unune wrote:
> Florian,
>
> On Thu, Jun 29, 2017 at 5:04 PM, Vivek Unune <npcomplete13@gmail.com> wrote:
>> Florian,
>>
>>>> I have managed to use DSA driver and was able detect both internal and
>>>> external switches. However, I only get packets flowing only through the
>>>> internal switch. I have used the ip & bridge commands to setup the vlan
>>>> 101 & 102 for lan and wan respectively.
>>>>
>>>> VLAN101 = lan1 lan2 lan3 lan4 lan5 lan6 lan7 lan8 eth0.101
>>>
>>> That looks reasonable although keep in mind that the IMP/CPU interfaces
>>> of the switch are configured with VLAN tags (see commit [1]), so you may
>>> need to make sure that port 0 of the internal switch is not accidentally
>>> configured back to untagged since that would cause problem when
>>> terminating the VLAN tag on the SW side.
>>>
>>> So here are a few things that you want to check:
>>>
>>> - read the MIB counters from the "extswitch" interface and see if
>>> packets flow through in both directions with no errors
>>
>> lan4 is on internal switch, lan1 on external. I cannot ping router from lan1
>>
>> Inter- | Receive | Transmit
>> face |bytes packets errs drop|bytes packets errs drop
>> br-lan: 168590 1726 0 0 190542 753 0 0
>> extswitch: 0 0 0 0 101012 1221 0 0
>> lan1: 0 0 0 0 5382 111 0 0
>> lan4: 0 0 0 0 1306680 13909 0 0
>> eth0: 3276924 5539 0 0 1106135 5084 0 0
>> eth0.101: 169338 1732 0 0 190256 750 0 0
>> eth0.102: 2959522 3274 0 0 587248 1094 0 0
>> lo: 39390 502 0 0 39390 502 0 0
>> br-wan: 2956822 3254 0 0 587248 1094 0 0
>>
>
> Please ignore above mib counters. I noticed that I see lot of RxFCSErrors
> and RxSymbolErrors for extswitch. The count for both counters always
> remain same.

Yes that is not exactly good, it means that the RGMII interface between
the internal and external switches is not properly configured.

>
> root@LEDE:/# ethtool -S extswitch
> NIC statistics:
> tx_packets: 212
> tx_bytes: 19179
> rx_packets: 0
> rx_bytes: 0
> TxOctets: 14403
> TxDropPkts: 0
> TxBroadcastPkts: 24
> TxMulticastPkts: 122
> TxUnicastPkts: 0
> TxCollisions: 0
> TxSingleCollision: 0
> TxMultipleCollision: 0
> TxDeferredTransmit: 0
> TxLateCollision: 0
> TxExcessiveCollision: 0
> TxPausePkts: 0
> RxOctets: 3593
> RxUndersizePkts: 0
> RxPausePkts: 0
> Pkts64Octets: 0
> Pkts65to127Octets: 36
> Pkts128to255Octets: 1
> Pkts256to511Octets: 0
> Pkts512to1023Octets: 0
> Pkts1024to1522Octets: 0
> RxOversizePkts: 0
> RxJabbers: 0
> RxAlignmentErrors: 0
> RxFCSErrors: 37
> RxGoodOctets: 0
> RxDropPkts: 0
> RxUnicastPkts: 0
> RxMulticastPkts: 0
> RxBroadcastPkts: 0
> RxSAChanges: 0
> RxFragments: 0
> RxJumboPkts: 0
> RxSymbolErrors: 37
> RxDiscarded: 0
> p08_TxOctets: 47537
> p08_TxDropPkts: 0
> p08_TxBroadcastPkts: 163
> p08_TxMulticastPkts: 319
> p08_TxUnicastPkts: 0
> p08_TxCollisions: 0
> p08_TxSingleCollision: 0
> p08_TxMultipleCollision: 0
> p08_TxDeferredTransmit: 0
> p08_TxLateCollision: 0
> p08_TxExcessiveCollision: 0
> p08_TxPausePkts: 0
> p08_RxOctets: 14403
> p08_RxUndersizePkts: 0
> p08_RxPausePkts: 0
> p08_Pkts64Octets: 25
> p08_Pkts65to127Octets: 102
> p08_Pkts128to255Octets: 17
> p08_Pkts256to511Octets: 2
> p08_Pkts512to1023Octets: 0
> p08_Pkts1024to1522Octets: 0
> p08_RxOversizePkts: 0
> p08_RxJabbers: 0
> p08_RxAlignmentErrors: 0
> p08_RxFCSErrors: 0
> p08_RxGoodOctets: 14403
> p08_RxDropPkts: 0
> p08_RxUnicastPkts: 0
> p08_RxMulticastPkts: 122
> p08_RxBroadcastPkts: 24
> p08_RxSAChanges: 40
> p08_RxFragments: 0
> p08_RxJumboPkts: 0
> p08_RxSymbolErrors: 0
> p08_RxDiscarded: 146
>
>
>>>
>>> - check the "extswitch" VLAN configuration on both the internal switch
>>> side (port 0) and on the external switch side ("cpu", port 8, not visible)
>>
>> #bridge vlan show
>> port vlan ids
>> extswitch None
>> extswitch
>> lan7 101 PVID Egress Untagged
>> lan7 101 PVID Egress Untagged
>> lan4 101 PVID Egress Untagged
>> lan4 101 PVID Egress Untagged
>> lan8 101 PVID Egress Untagged
>> lan8 101 PVID Egress Untagged
>> wan 102 PVID Egress Untagged
>> wan 102 PVID Egress Untagged
>> lan1 101 PVID Egress Untagged
>> lan1 101 PVID Egress Untagged
>> lan5 101 PVID Egress Untagged
>> lan5 101 PVID Egress Untagged
>> lan2 101 PVID Egress Untagged
>> lan2 101 PVID Egress Untagged
>> lan6 101 PVID Egress Untagged
>> lan6 101 PVID Egress Untagged
>> lan3 101 PVID Egress Untagged
>> lan3 101 PVID Egress Untagged
>> br-lan None
>> eth0.101 101 PVID Egress Untagged
>> eth0.101
>> br-wan None
>> eth0.102 102 PVID Egress Untagged
>> eth0.102
>>
>>>
>>> - see if you can get traffic end-to-end from eth0 all the way through
>>> one of the external switch port. If that's the case, that means that the
>>> configuration of internal switch port 0, internal switch CPU port, and
>>> external switch external port is working and operational
>>>
>>> [1]:
>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e47112d9d6009bf6b7438cedc0270316d6b0370d
>>>
>>>> VLAN102 = wan eth0.102
>>>>
>>>> Reading configs from the factory firmware, I'm sure that sw0port0 and> sw1port8 are connected. Excerpt from the same:
>>>>
>>>> port_numbers=0 2 4 2 1 3 1 3
>>>> port_switch_id=1 1 1 0 1 1 0 0
>>>> port_names=port0 port1 port2 port3 port4 port5 port6 port7
>>>
>>> Is 0 the identifier for the external or internal switch? If 0 is
>>> internal switch identifier and 1 is the external switch identifier, your
>>> mapping looks correct to me with one exception below:
>>
>> 0 is internal here.
>>
>>>
>>>> cpu_port_number=5 7 8
>>>> cpu_port_switch_id=0 0 0
>>>> hidden_port_numbers=0 8
>>>> hidden_port_switch_id=0 1
>>>>
>>>> Below is my updated device tree.
>>>>
>>>> Thanks,
>>>>
>>>> Vivek
>>>>
>>>> &srab {
>>>> compatible = "brcm,bcm53012-srab", "brcm,bcm5301x-srab";
>>>> status = "okay";
>>>> dsa,member = <0 0>;
>>>>
>>>> ports {
>>>> #address-cells = <1>;
>>>> #size-cells = <0>;
>>>>
>>>> port@1 {
>>>> reg = <1>;
>>>> label = "lan7";
>>>> };
>>>>
>>>> port@2 {
>>>> reg = <2>;
>>>> label = "lan4";
>>>> };
>>>>
>>>> port@3 {
>>>> reg = <3>;
>>>> label = "lan8";
>>>> };
>>>>
>>>> port@4 {
>>>> reg = <4>;
>>>> label = "wan";
>>>> };
>>>>
>>>> port@5 {
>>>> reg = <5>;
>>>> ethernet = <&gmac0>;
>>>> label = "cpu";
>>>>
>>>> fixed-link {
>>>>
>>>> speed = <1000>;
>>>> full-duplex;
>>>> };
>>>> };
>>>
>>> I think this is meant to be port 8 here based on the hidden_port_number
>>> value. This actually matters for VLAN configuration because B53 is not
>>> (unfortunately, to be fixed) consistently using dst->cpu_port (whatever
>>> is configured in Device Tree) vs. dev->cpu_port (hardcoded to 8 for this
>>> class of switch).
>>
>> When I connect to port 8 I receive no packets on internal switch.
>
> I'm able to now use sw0port8 <-> eth2 (i.e use cpu port 8 to connect to gmac2).
> For this I had to modify net/dsa/b53/b53_common.c (see below). This is how
> it is setup in net/phy/b53/b53_common.c. Also need to set
> cpu_port = B53_CPU_PORT for 53012 sw instead of B53_CPU_PORT_25

I actually plan to remove the use cpu_port entirely, or actually only
use it as a "hint" of which CPU ports are capable of supporting Broadcom
tags. A better change for now would be not to use dev->cpu_port, but
instead use ds->dst->cpu_dp->index like what b53_br_join() does.

>
> @@ -357,9 +357,11 @@ static void b53_enable_vlan(struct b53_d
> b53_read8(dev, B53_VLAN_PAGE, B53_VLAN_CTRL5, &vc5);
> }
>
> - mgmt &= ~SM_SW_FWD_MODE;
>
> if (enable) {
> +
> + mgmt |= SM_SW_FWD_MODE;
> +

Humm, that I don't really understand because this is turning on managed
mode which only influences how multicast addresses are processed, it
should not make a different for non-MC traffic AFAICT.

> vc0 |= VC0_VLAN_EN | VC0_VID_CHK_EN | VC0_VID_HASH_VID;
> vc1 |= VC1_RX_MCST_UNTAG_EN | VC1_RX_MCST_FWD_EN;
> vc4 &= ~VC4_ING_VID_CHECK_MASK;
>
>>
>>>
>>> PS: on that front, we will have to rework that when we bring multiple
>>> CPU port support in DSA/B53/bcm_sf2 and so for now what we could do is
>>> just check that the configured CPU port in Device Tree is a valid CPU
>>> port for that switch (typically 5, 7 or 8), and if not, just issue a
>>> warning.
>>>
>>>>
>>>> sw0port0: port@0 {
>>>> reg = <0>;
>>>> label = "extswitch";
>>>>
>>>> fixed-link {
>>>> speed = <1000>;
>>>> full-duplex;
>>>> };
>>>
>>> There might be some additional configuration needed here for this port,
>>> because by default, the port will most likely try to use its built-in
>>> PHY and maybe that's what they did, they wired the built-in PHY directly
>>> to the IMP port of the external switch.
>>
>> Do you know what that configuration might be?
>
> Given that I see RxFCSErrors and RxSymbolErrors errors wrt extswitch.
> configuration definitely needs tweaking. I tried setting the phy-mode to
> rgmii and rgmii-txid but no go.

Configuration may have to be tuned on both switches unfortunately
because both RGMII interfaces would have the ability to configure
delays. Do you have a way to dump what the original firmware settings
for the register that b53_adjust_link() modifies such that we can see
what was previous configured?

Thanks!
--
Florian

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