* ath9 stopped transmitting multicast frames in Linux 5.14.0
@ 2021-09-04 18:20 Petr Pisar
2021-09-25 7:07 ` Petr Pisar
0 siblings, 1 reply; 3+ messages in thread
From: Petr Pisar @ 2021-09-04 18:20 UTC (permalink / raw)
To: linux-wireless; +Cc: Petr Pisar
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Hello,
after upgrading Linux from 5.13.13 to 5.14.0 on my router with this wireless
device:
03:00.0 Network controller [0280]: Qualcomm Atheros AR93xx Wireless Network Adapter [168c:0030] (rev 01)
Subsystem: Qualcomm Atheros AR93xx Wireless Network Adapter [168c:3116]
Flags: bus master, fast devsel, latency 0, IRQ 18
Memory at 81200000 (64-bit, non-prefetchable) [size=128K]
Expansion ROM at 81220000 [disabled] [size=64K]
Capabilities: [40] Power Management version 3
Capabilities: [50] MSI: Enable- Count=1/4 Maskable+ 64bit+
Capabilities: [70] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Virtual Channel
Capabilities: [300] Device Serial Number 00-00-00-00-00-00-00-00
Kernel driver in use: ath9k
Kernel modules: ath9k
which works as a WiFi accesspoint, I noticed that WiFi clients cannot use IPv6
anymore. The problem is that the router cannot translate an IPv6 address of
the client to a MAC address. The reason is that IPv6 multicast packets used by
ICMPv6 neighbour discovery protocol do not reach the clients. In other words
the ath9k-driven device stopped transmitting multicast frames.
This can be reproduced with "ndisc6 -r 100 fe80::217:c4ff:fe4e:1552 wlan0"
command which queries (100 times) fe80::217:c4ff:fe4e:1552 address of
my client from the router. tcpdump on the ath9k device shows the queries,
but tcpdump on the client cannot see them.
The other way works correctly. I observed this with all two WiFi clients
I have (Pixel 3a phone, and a laptop with a Realtek chip). Upgrading to 5.14.1
did not help. Once I rebooted to 5.13.13, the functionality was restored.
Therefore I conclude this is regression in 5.14.0 Linux.
-- Petr
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^ permalink raw reply [flat|nested] 3+ messages in thread* Re: ath9 stopped transmitting multicast frames in Linux 5.14.0
2021-09-04 18:20 ath9 stopped transmitting multicast frames in Linux 5.14.0 Petr Pisar
@ 2021-09-25 7:07 ` Petr Pisar
2021-10-01 6:51 ` Kalle Valo
0 siblings, 1 reply; 3+ messages in thread
From: Petr Pisar @ 2021-09-25 7:07 UTC (permalink / raw)
To: linux-wireless; +Cc: petr.pisar
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V Sat, Sep 04, 2021 at 08:20:57PM +0200, Petr Pisar napsal(a):
> Hello,
>
> after upgrading Linux from 5.13.13 to 5.14.0 on my router with this wireless
> device:
>
> 03:00.0 Network controller [0280]: Qualcomm Atheros AR93xx Wireless Network Adapter [168c:0030] (rev 01)
> Subsystem: Qualcomm Atheros AR93xx Wireless Network Adapter [168c:3116]
> Flags: bus master, fast devsel, latency 0, IRQ 18
> Memory at 81200000 (64-bit, non-prefetchable) [size=128K]
> Expansion ROM at 81220000 [disabled] [size=64K]
> Capabilities: [40] Power Management version 3
> Capabilities: [50] MSI: Enable- Count=1/4 Maskable+ 64bit+
> Capabilities: [70] Express Endpoint, MSI 00
> Capabilities: [100] Advanced Error Reporting
> Capabilities: [140] Virtual Channel
> Capabilities: [300] Device Serial Number 00-00-00-00-00-00-00-00
> Kernel driver in use: ath9k
> Kernel modules: ath9k
>
> which works as a WiFi accesspoint, I noticed that WiFi clients cannot use IPv6
> anymore. The problem is that the router cannot translate an IPv6 address of
> the client to a MAC address. The reason is that IPv6 multicast packets used by
> ICMPv6 neighbour discovery protocol do not reach the clients. In other words
> the ath9k-driven device stopped transmitting multicast frames.
>
The same observation was reported here by Felix Fietkau in "[PATCH] Revert
"mac80211: do not use low data rates for data frames with no ack flag""
<https://marc.info/?l=linux-wireless&m=163091738109000&w=2> with a proposal to
revert the offending d333322361e7a099dc74df2498d3fa5fde5c4fa7 commit.
-- Petr
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: ath9 stopped transmitting multicast frames in Linux 5.14.0
2021-09-25 7:07 ` Petr Pisar
@ 2021-10-01 6:51 ` Kalle Valo
0 siblings, 0 replies; 3+ messages in thread
From: Kalle Valo @ 2021-10-01 6:51 UTC (permalink / raw)
To: Petr Pisar; +Cc: linux-wireless
Petr Pisar <petr.pisar@atlas.cz> writes:
> V Sat, Sep 04, 2021 at 08:20:57PM +0200, Petr Pisar napsal(a):
>> Hello,
>>
>> after upgrading Linux from 5.13.13 to 5.14.0 on my router with this wireless
>> device:
>>
>> 03:00.0 Network controller [0280]: Qualcomm Atheros AR93xx Wireless Network Adapter [168c:0030] (rev 01)
>> Subsystem: Qualcomm Atheros AR93xx Wireless Network Adapter [168c:3116]
>> Flags: bus master, fast devsel, latency 0, IRQ 18
>> Memory at 81200000 (64-bit, non-prefetchable) [size=128K]
>> Expansion ROM at 81220000 [disabled] [size=64K]
>> Capabilities: [40] Power Management version 3
>> Capabilities: [50] MSI: Enable- Count=1/4 Maskable+ 64bit+
>> Capabilities: [70] Express Endpoint, MSI 00
>> Capabilities: [100] Advanced Error Reporting
>> Capabilities: [140] Virtual Channel
>> Capabilities: [300] Device Serial Number 00-00-00-00-00-00-00-00
>> Kernel driver in use: ath9k
>> Kernel modules: ath9k
>>
>> which works as a WiFi accesspoint, I noticed that WiFi clients cannot use IPv6
>> anymore. The problem is that the router cannot translate an IPv6 address of
>> the client to a MAC address. The reason is that IPv6 multicast packets used by
>> ICMPv6 neighbour discovery protocol do not reach the clients. In other words
>> the ath9k-driven device stopped transmitting multicast frames.
>
> The same observation was reported here by Felix Fietkau in "[PATCH] Revert
> "mac80211: do not use low data rates for data frames with no ack flag""
> <https://marc.info/?l=linux-wireless&m=163091738109000&w=2> with a proposal to
> revert the offending d333322361e7a099dc74df2498d3fa5fde5c4fa7 commit.
Very good, thanks for the followup.
--
https://patchwork.kernel.org/project/linux-wireless/list/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
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