[OpenWrt-Devel] ar934x+ar8327v4

[David Hutchison]

Hello,

I have made some progress narrowing down the issue. It seems the
ath79_eth0_pll_data.pll_1000 is not configured correctly. I do not
understand how to determine what the correct value should be.
Originally the mach-rb95x.c did not have any definition for this
variable. I looked at other Mikrotik architectures and found the
750Gr3 utilized this and set it to 0x62000000. When I compiled this I
noticed differences in the amount of packets I was receiving via eth0.

Looking at more architectures it appears that other devices with an
ar8327 use 0x06000000. I tried that and saw 100% packet loss, and arp
was not responding. I went ahead and *guessed* and tried 0x66000000.
Now pings sporadically began to respond:

root at OpenWrt:/# arp -n
IP address       HW type     Flags       HW address            Mask     Device
10.128.41.1      0x1         0x2         d4:ca:6d:77:2b:3d     *        eth0
root at OpenWrt:/# ifconfig eth0 10.128.41.2 netmask 255.255.255.0 up
root at OpenWrt:/# ifconfig eth0
eth0      Link encap:Ethernet  HWaddr 4C:5E:0C:6D:24:43
          inet addr:10.128.41.248  Bcast:10.128.41.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:187 errors:0 dropped:0 overruns:0 frame:0
          TX packets:20 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:14785 (14.4 KiB)  TX bytes:2180 (2.1 KiB)
          Interrupt:4

root at OpenWrt:/# ping 10.128.41.1
PING 10.128.41.1 (10.128.41.1): 56 data bytes
64 bytes from 10.128.41.1: seq=3 ttl=64 time=1.169 ms
64 bytes from 10.128.41.1: seq=10 ttl=64 time=0.663 ms
64 bytes from 10.128.41.1: seq=12 ttl=64 time=1992.529 ms
64 bytes from 10.128.41.1: seq=17 ttl=64 time=0.660 ms
64 bytes from 10.128.41.1: seq=20 ttl=64 time=0.610 ms
64 bytes from 10.128.41.1: seq=23 ttl=64 time=0.612 ms
64 bytes from 10.128.41.1: seq=27 ttl=64 time=0.634 ms
64 bytes from 10.128.41.1: seq=31 ttl=64 time=0.631 ms
64 bytes from 10.128.41.1: seq=39 ttl=64 time=0.583 ms
^C
--- 10.128.41.1 ping statistics ---
40 packets transmitted, 9 packets received, 77% packet loss
round-trip min/avg/max = 0.583/222.010/1992.529 ms

I have about 77% packet loss.

This is improvement as originally we saw 100% packet loss and no arp.

I looked at a patch by Gabor Juhosg (
https://dev.openwrt.org/browser/trunk/target/linux/ar71xx/files/arch/mips/ath79/mach-rb91x.c?rev=39642
) and he set the RB91x to 0x02000000
I think if we correctly configure it in mach-rb95x.c, we may solve the
problem :-)

Could someone help me determine what the correct
ath79_eth0_pll_data.pll_1000 should be configured to?

-- Davey

On Mon, Dec 8, 2014 at 3:20 PM, Chris Green <cl at isbd.net> wrote:
> On Mon, Dec 08, 2014 at 11:13:07AM -0700, David Hutchison wrote:
>>
>> root at OpenWrt:/dev# ifconfig eth0
>> eth0      Link encap:Ethernet  HWaddr 4C:5E:0C:6D:24:43
>>           inet addr:10.128.41.249  Bcast:10.128.41.255  Mask:255.255.255.0
>>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>>           RX packets:144 errors:0 dropped:0 overruns:0 frame:0
>>           TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
>>           collisions:0 txqueuelen:1000
>>           RX bytes:8996 (8.7 KiB)  TX bytes:1292 (1.2 KiB)
>>           Interrupt:4
>>
> If it's of any use/interest my rb-2011uias-2hnd gives the following
> MAC addresses:-
>
>     br-lan    Link encap:Ethernet  HWaddr 4C:5E:0C:73:87:3E
>     eth0      Link encap:Ethernet  HWaddr 4C:5E:0C:73:87:3E
>     eth0.1    Link encap:Ethernet  HWaddr 4C:5E:0C:73:87:3E
>     eth0.2    Link encap:Ethernet  HWaddr 4C:5E:0C:73:87:3E
>     eth0.3    Link encap:Ethernet  HWaddr 4C:5E:0C:73:87:3E
>     eth1      Link encap:Ethernet  HWaddr 4C:5E:0C:73:87:43
>
> Oddly it's eth1, the 10/100 fast ethernet switch built into the
> processor that works and eth0 the Gigabit switch that doesn't work.
>
> Running an ARP scan from another computer on the LAN shows the
> mikrotik (192.168.1.40) as follows:-
>
>     192.168.1.40     mikrotik                    4C:5E:0C:73:87:3E (Unknown)
>
>
> --
> Chris Green
> _______________________________________________
> openwrt-devel mailing list
> openwrt-devel at lists.openwrt.org
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