This patch enables channel switch support on mt76 usb interfaces.
Signed-off-by: Markus Theil <[email protected]>
---
drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c | 7 +++++++
drivers/net/wireless/mediatek/mt76/mt76x02_util.c | 2 +-
2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
index 90c024f12302..b9bd6bfb2a9d 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
@@ -210,6 +210,12 @@ static void mt76x02u_pre_tbtt_work(struct work_struct *work)
mt76x02_mac_set_beacon_prepare(dev);
+ mt76_csa_check(&dev->mt76);
+ if (dev->mt76.csa_complete) {
+ mt76_csa_finish(&dev->mt76);
+ goto out;
+ }
+
ieee80211_iterate_active_interfaces(mt76_hw(dev),
IEEE80211_IFACE_ITER_RESUME_ALL,
mt76x02_update_beacon_iter, dev);
@@ -224,6 +230,7 @@ static void mt76x02u_pre_tbtt_work(struct work_struct *work)
mt76x02_mac_set_beacon_finish(dev);
+out:
mt76x02u_restart_pre_tbtt_timer(dev);
}
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_util.c b/drivers/net/wireless/mediatek/mt76/mt76x02_util.c
index 1142aa39a226..85df9bfadd4c 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02_util.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02_util.c
@@ -166,7 +166,6 @@ void mt76x02_init_device(struct mt76x02_dev *dev)
wiphy->reg_notifier = mt76x02_regd_notifier;
wiphy->iface_combinations = mt76x02_if_comb;
wiphy->n_iface_combinations = ARRAY_SIZE(mt76x02_if_comb);
- wiphy->flags |= WIPHY_FLAG_HAS_CHANNEL_SWITCH;
/* init led callbacks */
if (IS_ENABLED(CONFIG_MT76_LEDS)) {
@@ -176,6 +175,7 @@ void mt76x02_init_device(struct mt76x02_dev *dev)
}
}
+ wiphy->flags |= WIPHY_FLAG_HAS_CHANNEL_SWITCH;
wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_VHT_IBSS);
hw->sta_data_size = sizeof(struct mt76x02_sta);
--
2.24.0
On Thu, Nov 21, 2019 at 07:00:01PM +0100, Markus Theil wrote:
> diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
> index 90c024f12302..b9bd6bfb2a9d 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
> @@ -210,6 +210,12 @@ static void mt76x02u_pre_tbtt_work(struct work_struct *work)
>
> mt76x02_mac_set_beacon_prepare(dev);
>
> + mt76_csa_check(&dev->mt76);
> + if (dev->mt76.csa_complete) {
> + mt76_csa_finish(&dev->mt76);
> + goto out;
> + }
mmio counterpart setup beacons on CSA, but do not sent buffered
PS frames. Perhaps here we should do the same. However not sending
beacons on one TBTT looks ok to me as well.
Stanislaw
On 11/25/19 2:04 PM, Stanislaw Gruszka wrote:
> On Thu, Nov 21, 2019 at 07:00:01PM +0100, Markus Theil wrote:
>> diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
>> index 90c024f12302..b9bd6bfb2a9d 100644
>> --- a/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
>> +++ b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
>> @@ -210,6 +210,12 @@ static void mt76x02u_pre_tbtt_work(struct work_struct *work)
>>
>> mt76x02_mac_set_beacon_prepare(dev);
>>
>> + mt76_csa_check(&dev->mt76);
>> + if (dev->mt76.csa_complete) {
>> + mt76_csa_finish(&dev->mt76);
>> + goto out;
>> + }
> mmio counterpart setup beacons on CSA, but do not sent buffered
> PS frames. Perhaps here we should do the same. However not sending
> beacons on one TBTT looks ok to me as well.
>
> Stanislaw
>
If I change the order of beacon iteration and csa check, the following warning in mac80211 gets triggered:
/* the counter should never reach 0 */
WARN_ON_ONCE(!beacon->csa_current_counter);
Dmesg output looks like this:
[ 153.829617] ------------[ cut here ]------------
[ 153.829752] WARNING: CPU: 0 PID: 224 at net/mac80211/tx.c:4318 __ieee80211_csa_update_counter.isra.0.part.0+0x5/0x10 [mac80211]
[ 153.829756] Modules linked in: ccm bridge stp llc nft_masq nft_chain_nat nf_nat nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c nf_tables_set nf_tables nfnetlink ath10k_pci amd64_edac_mod mt76x2u edac_mce_amd mt76x2_common ath10k_core mt76x02_usb kvm_amd mt76_usb mt76x02_lib mt76 kvm ath mac80211 irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel cfg80211 pcengines_apuv2 gpio_keys_polled aesni_intel input_polldev crypto_simd gpio_amd_fch cryptd glue_helper igb pcspkr k10temp fam15h_power rfkill sp5100_tco i2c_piix4 libarc4 ccp i2c_algo_bit dca rng_core uio_pdrv_genirq uio leds_gpio evdev mac_hid pinctrl_amd coreboot_table acpi_cpufreq ip_tables x_tables ext4 crc32c_generic crc16 mbcache jbd2 sd_mod ahci sdhci_pci libahci cqhci libata sdhci crc32c_intel xhci_pci ehci_pci mmc_core xhci_hcd scsi_mod ehci_hcd gpio_keys
[ 153.829948] CPU: 0 PID: 224 Comm: kworker/0:1H Not tainted 5.4.0-rc7-1-01110-g19b7e21c55c8 #32
[ 153.829952] Hardware name: PC Engines apu2/apu2, BIOS v4.10.0.3 11/07/2019
[ 153.829966] Workqueue: events_highpri mt76x02u_pre_tbtt_work [mt76x02_usb]
[ 153.830067] RIP: 0010:__ieee80211_csa_update_counter.isra.0.part.0+0x5/0x10 [mac80211]
[ 153.830077] Code: 4c 89 4a 18 c3 48 8b 47 10 4c 89 4f 10 48 89 4e 18 48 89 46 20 4c 89 08 eb a1 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 <0f> 0b c3 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 41 54 53 48 89 fb
[ 153.830082] RSP: 0018:ffffbde8803d7c80 EFLAGS: 00010246
[ 153.830089] RAX: 0000000000000003 RBX: ffffbde8803d7d20 RCX: ffffa3b01df8f658
[ 153.830093] RDX: ffffbde8803d7d20 RSI: ffffa3b02901d450 RDI: ffffbde8803d7ce0
[ 153.830097] RBP: ffffa3b0267007a0 R08: ffffffff8d011040 R09: 0000000000000000
[ 153.830101] R10: ffffa3b029908098 R11: ffffa3b02ab2ab38 R12: 0000000000000000
[ 153.830105] R13: ffffa3b02901d450 R14: 0000000000000000 R15: ffffa3b0284eae00
[ 153.830111] FS: 0000000000000000(0000) GS:ffffa3b02aa00000(0000) knlGS:0000000000000000
[ 153.830115] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 153.830119] CR2: 00007fbb6b5c9f30 CR3: 0000000126ee2000 CR4: 00000000000406f0
[ 153.830124] Call Trace:
[ 153.830203] __ieee80211_beacon_get+0x4c2/0x4d0 [mac80211]
[ 153.830312] ieee80211_beacon_get_tim+0x41/0x150 [mac80211]
[ 153.830336] mt76x02_update_beacon_iter+0x2d/0x40 [mt76x02_lib]
[ 153.830352] ? mt76x02_add_buffered_bc+0x80/0x80 [mt76x02_lib]
[ 153.830420] __iterate_interfaces+0x74/0x110 [mac80211]
[ 153.830469] ? mt76x02_add_buffered_bc+0x80/0x80 [mt76x02_lib]
[ 153.830566] ieee80211_iterate_interfaces+0x3a/0x50 [mac80211]
[ 153.830580] mt76x02u_pre_tbtt_work+0x96/0x220 [mt76x02_usb]
[ 153.830600] process_one_work+0x1e2/0x3b0
[ 153.830610] worker_thread+0x4a/0x3d0
[ 153.830623] kthread+0xfb/0x130
[ 153.830631] ? process_one_work+0x3b0/0x3b0
[ 153.830639] ? kthread_park+0x90/0x90
[ 153.830650] ret_from_fork+0x22/0x40
[ 153.830665] ---[ end trace 7a658e5cbfd0f9d1 ]---
Markus
On 11/25/19 3:51 PM, Markus Theil wrote:
> On 11/25/19 2:04 PM, Stanislaw Gruszka wrote:
>> On Thu, Nov 21, 2019 at 07:00:01PM +0100, Markus Theil wrote:
>>> diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
>>> index 90c024f12302..b9bd6bfb2a9d 100644
>>> --- a/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
>>> +++ b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
>>> @@ -210,6 +210,12 @@ static void mt76x02u_pre_tbtt_work(struct work_struct *work)
>>>
>>> mt76x02_mac_set_beacon_prepare(dev);
>>>
>>> + mt76_csa_check(&dev->mt76);
>>> + if (dev->mt76.csa_complete) {
>>> + mt76_csa_finish(&dev->mt76);
>>> + goto out;
>>> + }
>> mmio counterpart setup beacons on CSA, but do not sent buffered
>> PS frames. Perhaps here we should do the same. However not sending
>> beacons on one TBTT looks ok to me as well.
>>
>> Stanislaw
>>
> If I change the order of beacon iteration and csa check, the following warning in mac80211 gets triggered:
>
> /* the counter should never reach 0 */
> WARN_ON_ONCE(!beacon->csa_current_counter);
>
> Dmesg output looks like this:
>
> [ 153.829617] ------------[ cut here ]------------
> [ 153.829752] WARNING: CPU: 0 PID: 224 at net/mac80211/tx.c:4318 __ieee80211_csa_update_counter.isra.0.part.0+0x5/0x10 [mac80211]
> [ 153.829756] Modules linked in: ccm bridge stp llc nft_masq nft_chain_nat nf_nat nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c nf_tables_set nf_tables nfnetlink ath10k_pci amd64_edac_mod mt76x2u edac_mce_amd mt76x2_common ath10k_core mt76x02_usb kvm_amd mt76_usb mt76x02_lib mt76 kvm ath mac80211 irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel cfg80211 pcengines_apuv2 gpio_keys_polled aesni_intel input_polldev crypto_simd gpio_amd_fch cryptd glue_helper igb pcspkr k10temp fam15h_power rfkill sp5100_tco i2c_piix4 libarc4 ccp i2c_algo_bit dca rng_core uio_pdrv_genirq uio leds_gpio evdev mac_hid pinctrl_amd coreboot_table acpi_cpufreq ip_tables x_tables ext4 crc32c_generic crc16 mbcache jbd2 sd_mod ahci sdhci_pci libahci cqhci libata sdhci crc32c_intel xhci_pci ehci_pci mmc_core xhci_hcd scsi_mod ehci_hcd gpio_keys
> [ 153.829948] CPU: 0 PID: 224 Comm: kworker/0:1H Not tainted 5.4.0-rc7-1-01110-g19b7e21c55c8 #32
> [ 153.829952] Hardware name: PC Engines apu2/apu2, BIOS v4.10.0.3 11/07/2019
> [ 153.829966] Workqueue: events_highpri mt76x02u_pre_tbtt_work [mt76x02_usb]
> [ 153.830067] RIP: 0010:__ieee80211_csa_update_counter.isra.0.part.0+0x5/0x10 [mac80211]
> [ 153.830077] Code: 4c 89 4a 18 c3 48 8b 47 10 4c 89 4f 10 48 89 4e 18 48 89 46 20 4c 89 08 eb a1 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 <0f> 0b c3 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 41 54 53 48 89 fb
> [ 153.830082] RSP: 0018:ffffbde8803d7c80 EFLAGS: 00010246
> [ 153.830089] RAX: 0000000000000003 RBX: ffffbde8803d7d20 RCX: ffffa3b01df8f658
> [ 153.830093] RDX: ffffbde8803d7d20 RSI: ffffa3b02901d450 RDI: ffffbde8803d7ce0
> [ 153.830097] RBP: ffffa3b0267007a0 R08: ffffffff8d011040 R09: 0000000000000000
> [ 153.830101] R10: ffffa3b029908098 R11: ffffa3b02ab2ab38 R12: 0000000000000000
> [ 153.830105] R13: ffffa3b02901d450 R14: 0000000000000000 R15: ffffa3b0284eae00
> [ 153.830111] FS: 0000000000000000(0000) GS:ffffa3b02aa00000(0000) knlGS:0000000000000000
> [ 153.830115] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 153.830119] CR2: 00007fbb6b5c9f30 CR3: 0000000126ee2000 CR4: 00000000000406f0
> [ 153.830124] Call Trace:
> [ 153.830203] __ieee80211_beacon_get+0x4c2/0x4d0 [mac80211]
> [ 153.830312] ieee80211_beacon_get_tim+0x41/0x150 [mac80211]
> [ 153.830336] mt76x02_update_beacon_iter+0x2d/0x40 [mt76x02_lib]
> [ 153.830352] ? mt76x02_add_buffered_bc+0x80/0x80 [mt76x02_lib]
> [ 153.830420] __iterate_interfaces+0x74/0x110 [mac80211]
> [ 153.830469] ? mt76x02_add_buffered_bc+0x80/0x80 [mt76x02_lib]
> [ 153.830566] ieee80211_iterate_interfaces+0x3a/0x50 [mac80211]
> [ 153.830580] mt76x02u_pre_tbtt_work+0x96/0x220 [mt76x02_usb]
> [ 153.830600] process_one_work+0x1e2/0x3b0
> [ 153.830610] worker_thread+0x4a/0x3d0
> [ 153.830623] kthread+0xfb/0x130
> [ 153.830631] ? process_one_work+0x3b0/0x3b0
> [ 153.830639] ? kthread_park+0x90/0x90
> [ 153.830650] ret_from_fork+0x22/0x40
> [ 153.830665] ---[ end trace 7a658e5cbfd0f9d1 ]---
>
> Markus
>
In my current local changes I've decoupled checking csa_check and mt76_csa_finish, like it is in the mmio case. As usb has no tbtt interrupt,
I just schedule a delayed work around the estimated beacon transmission time and finish csa there. I'll send another series, if this works.
Markus
On Mon, Nov 25, 2019 at 04:32:42PM +0100, Markus Theil wrote:
>
> On 11/25/19 3:51 PM, Markus Theil wrote:
> > On 11/25/19 2:04 PM, Stanislaw Gruszka wrote:
> >> On Thu, Nov 21, 2019 at 07:00:01PM +0100, Markus Theil wrote:
> >>> diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
> >>> index 90c024f12302..b9bd6bfb2a9d 100644
> >>> --- a/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
> >>> +++ b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
> >>> @@ -210,6 +210,12 @@ static void mt76x02u_pre_tbtt_work(struct work_struct *work)
> >>>
> >>> mt76x02_mac_set_beacon_prepare(dev);
> >>>
> >>> + mt76_csa_check(&dev->mt76);
> >>> + if (dev->mt76.csa_complete) {
> >>> + mt76_csa_finish(&dev->mt76);
> >>> + goto out;
> >>> + }
> >> mmio counterpart setup beacons on CSA, but do not sent buffered
> >> PS frames. Perhaps here we should do the same. However not sending
> >> beacons on one TBTT looks ok to me as well.
> >>
> >> Stanislaw
> >>
> > If I change the order of beacon iteration and csa check, the following warning in mac80211 gets triggered:
> >
> > /* the counter should never reach 0 */
> > WARN_ON_ONCE(!beacon->csa_current_counter);
> >
> > Dmesg output looks like this:
> >
> > [ 153.829617] ------------[ cut here ]------------
> > [ 153.829752] WARNING: CPU: 0 PID: 224 at net/mac80211/tx.c:4318 __ieee80211_csa_update_counter.isra.0.part.0+0x5/0x10 [mac80211]
> > [ 153.829756] Modules linked in: ccm bridge stp llc nft_masq nft_chain_nat nf_nat nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c nf_tables_set nf_tables nfnetlink ath10k_pci amd64_edac_mod mt76x2u edac_mce_amd mt76x2_common ath10k_core mt76x02_usb kvm_amd mt76_usb mt76x02_lib mt76 kvm ath mac80211 irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel cfg80211 pcengines_apuv2 gpio_keys_polled aesni_intel input_polldev crypto_simd gpio_amd_fch cryptd glue_helper igb pcspkr k10temp fam15h_power rfkill sp5100_tco i2c_piix4 libarc4 ccp i2c_algo_bit dca rng_core uio_pdrv_genirq uio leds_gpio evdev mac_hid pinctrl_amd coreboot_table acpi_cpufreq ip_tables x_tables ext4 crc32c_generic crc16 mbcache jbd2 sd_mod ahci sdhci_pci libahci cqhci libata sdhci crc32c_intel xhci_pci ehci_pci mmc_core xhci_hcd scsi_mod ehci_hcd gpio_keys
> > [ 153.829948] CPU: 0 PID: 224 Comm: kworker/0:1H Not tainted 5.4.0-rc7-1-01110-g19b7e21c55c8 #32
> > [ 153.829952] Hardware name: PC Engines apu2/apu2, BIOS v4.10.0.3 11/07/2019
> > [ 153.829966] Workqueue: events_highpri mt76x02u_pre_tbtt_work [mt76x02_usb]
> > [ 153.830067] RIP: 0010:__ieee80211_csa_update_counter.isra.0.part.0+0x5/0x10 [mac80211]
> > [ 153.830077] Code: 4c 89 4a 18 c3 48 8b 47 10 4c 89 4f 10 48 89 4e 18 48 89 46 20 4c 89 08 eb a1 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 <0f> 0b c3 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 41 54 53 48 89 fb
> > [ 153.830082] RSP: 0018:ffffbde8803d7c80 EFLAGS: 00010246
> > [ 153.830089] RAX: 0000000000000003 RBX: ffffbde8803d7d20 RCX: ffffa3b01df8f658
> > [ 153.830093] RDX: ffffbde8803d7d20 RSI: ffffa3b02901d450 RDI: ffffbde8803d7ce0
> > [ 153.830097] RBP: ffffa3b0267007a0 R08: ffffffff8d011040 R09: 0000000000000000
> > [ 153.830101] R10: ffffa3b029908098 R11: ffffa3b02ab2ab38 R12: 0000000000000000
> > [ 153.830105] R13: ffffa3b02901d450 R14: 0000000000000000 R15: ffffa3b0284eae00
> > [ 153.830111] FS: 0000000000000000(0000) GS:ffffa3b02aa00000(0000) knlGS:0000000000000000
> > [ 153.830115] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [ 153.830119] CR2: 00007fbb6b5c9f30 CR3: 0000000126ee2000 CR4: 00000000000406f0
> > [ 153.830124] Call Trace:
> > [ 153.830203] __ieee80211_beacon_get+0x4c2/0x4d0 [mac80211]
> > [ 153.830312] ieee80211_beacon_get_tim+0x41/0x150 [mac80211]
> > [ 153.830336] mt76x02_update_beacon_iter+0x2d/0x40 [mt76x02_lib]
> > [ 153.830352] ? mt76x02_add_buffered_bc+0x80/0x80 [mt76x02_lib]
> > [ 153.830420] __iterate_interfaces+0x74/0x110 [mac80211]
> > [ 153.830469] ? mt76x02_add_buffered_bc+0x80/0x80 [mt76x02_lib]
> > [ 153.830566] ieee80211_iterate_interfaces+0x3a/0x50 [mac80211]
> > [ 153.830580] mt76x02u_pre_tbtt_work+0x96/0x220 [mt76x02_usb]
> > [ 153.830600] process_one_work+0x1e2/0x3b0
> > [ 153.830610] worker_thread+0x4a/0x3d0
> > [ 153.830623] kthread+0xfb/0x130
> > [ 153.830631] ? process_one_work+0x3b0/0x3b0
> > [ 153.830639] ? kthread_park+0x90/0x90
> > [ 153.830650] ret_from_fork+0x22/0x40
> > [ 153.830665] ---[ end trace 7a658e5cbfd0f9d1 ]---
> >
> > Markus
> >
> In my current local changes I've decoupled checking csa_check and mt76_csa_finish, like it is in the mmio case. As usb has no tbtt interrupt,
> I just schedule a delayed work around the estimated beacon transmission time and finish csa there. I'll send another series, if this works.
I would prefer not to add yet another delayed work. Does the warning
still happen if you arrange code like this?
mt76x02_mac_set_beacon_prepare(dev);
ieee80211_iterate_active_interfaces(mt76_hw(dev),
IEEE80211_IFACE_ITER_RESUME_ALL,
mt76x02_update_beacon_iter, dev);
mt76_csa_check(&dev->mt76);
if (dev->mt76.csa_complete) {
mt76_csa_finish(&dev->mt76);
goto out;
}
nbeacons = hweight8(dev->mt76.beacon_mask);
mt76x02_enqueue_buffered_bc(dev, &data, N_BCN_SLOTS - nbeacons);
...
out:
mt76x02_mac_set_beacon_finish(dev);
mt76x02u_restart_pre_tbtt_timer(dev);
On 11/25/19 6:02 PM, Stanislaw Gruszka wrote:
> On Mon, Nov 25, 2019 at 04:32:42PM +0100, Markus Theil wrote:
>> On 11/25/19 3:51 PM, Markus Theil wrote:
>>> On 11/25/19 2:04 PM, Stanislaw Gruszka wrote:
>>>> On Thu, Nov 21, 2019 at 07:00:01PM +0100, Markus Theil wrote:
>>>>> diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
>>>>> index 90c024f12302..b9bd6bfb2a9d 100644
>>>>> --- a/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
>>>>> +++ b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
>>>>> @@ -210,6 +210,12 @@ static void mt76x02u_pre_tbtt_work(struct work_struct *work)
>>>>>
>>>>> mt76x02_mac_set_beacon_prepare(dev);
>>>>>
>>>>> + mt76_csa_check(&dev->mt76);
>>>>> + if (dev->mt76.csa_complete) {
>>>>> + mt76_csa_finish(&dev->mt76);
>>>>> + goto out;
>>>>> + }
>>>> mmio counterpart setup beacons on CSA, but do not sent buffered
>>>> PS frames. Perhaps here we should do the same. However not sending
>>>> beacons on one TBTT looks ok to me as well.
>>>>
>>>> Stanislaw
>>>>
>>> If I change the order of beacon iteration and csa check, the following warning in mac80211 gets triggered:
>>>
>>> /* the counter should never reach 0 */
>>> WARN_ON_ONCE(!beacon->csa_current_counter);
>>>
>>> Dmesg output looks like this:
>>>
>>> [ 153.829617] ------------[ cut here ]------------
>>> [ 153.829752] WARNING: CPU: 0 PID: 224 at net/mac80211/tx.c:4318 __ieee80211_csa_update_counter.isra.0.part.0+0x5/0x10 [mac80211]
>>> [ 153.829756] Modules linked in: ccm bridge stp llc nft_masq nft_chain_nat nf_nat nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c nf_tables_set nf_tables nfnetlink ath10k_pci amd64_edac_mod mt76x2u edac_mce_amd mt76x2_common ath10k_core mt76x02_usb kvm_amd mt76_usb mt76x02_lib mt76 kvm ath mac80211 irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel cfg80211 pcengines_apuv2 gpio_keys_polled aesni_intel input_polldev crypto_simd gpio_amd_fch cryptd glue_helper igb pcspkr k10temp fam15h_power rfkill sp5100_tco i2c_piix4 libarc4 ccp i2c_algo_bit dca rng_core uio_pdrv_genirq uio leds_gpio evdev mac_hid pinctrl_amd coreboot_table acpi_cpufreq ip_tables x_tables ext4 crc32c_generic crc16 mbcache jbd2 sd_mod ahci sdhci_pci libahci cqhci libata sdhci crc32c_intel xhci_pci ehci_pci mmc_core xhci_hcd scsi_mod ehci_hcd gpio_keys
>>> [ 153.829948] CPU: 0 PID: 224 Comm: kworker/0:1H Not tainted 5.4.0-rc7-1-01110-g19b7e21c55c8 #32
>>> [ 153.829952] Hardware name: PC Engines apu2/apu2, BIOS v4.10.0.3 11/07/2019
>>> [ 153.829966] Workqueue: events_highpri mt76x02u_pre_tbtt_work [mt76x02_usb]
>>> [ 153.830067] RIP: 0010:__ieee80211_csa_update_counter.isra.0.part.0+0x5/0x10 [mac80211]
>>> [ 153.830077] Code: 4c 89 4a 18 c3 48 8b 47 10 4c 89 4f 10 48 89 4e 18 48 89 46 20 4c 89 08 eb a1 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 <0f> 0b c3 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 41 54 53 48 89 fb
>>> [ 153.830082] RSP: 0018:ffffbde8803d7c80 EFLAGS: 00010246
>>> [ 153.830089] RAX: 0000000000000003 RBX: ffffbde8803d7d20 RCX: ffffa3b01df8f658
>>> [ 153.830093] RDX: ffffbde8803d7d20 RSI: ffffa3b02901d450 RDI: ffffbde8803d7ce0
>>> [ 153.830097] RBP: ffffa3b0267007a0 R08: ffffffff8d011040 R09: 0000000000000000
>>> [ 153.830101] R10: ffffa3b029908098 R11: ffffa3b02ab2ab38 R12: 0000000000000000
>>> [ 153.830105] R13: ffffa3b02901d450 R14: 0000000000000000 R15: ffffa3b0284eae00
>>> [ 153.830111] FS: 0000000000000000(0000) GS:ffffa3b02aa00000(0000) knlGS:0000000000000000
>>> [ 153.830115] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>> [ 153.830119] CR2: 00007fbb6b5c9f30 CR3: 0000000126ee2000 CR4: 00000000000406f0
>>> [ 153.830124] Call Trace:
>>> [ 153.830203] __ieee80211_beacon_get+0x4c2/0x4d0 [mac80211]
>>> [ 153.830312] ieee80211_beacon_get_tim+0x41/0x150 [mac80211]
>>> [ 153.830336] mt76x02_update_beacon_iter+0x2d/0x40 [mt76x02_lib]
>>> [ 153.830352] ? mt76x02_add_buffered_bc+0x80/0x80 [mt76x02_lib]
>>> [ 153.830420] __iterate_interfaces+0x74/0x110 [mac80211]
>>> [ 153.830469] ? mt76x02_add_buffered_bc+0x80/0x80 [mt76x02_lib]
>>> [ 153.830566] ieee80211_iterate_interfaces+0x3a/0x50 [mac80211]
>>> [ 153.830580] mt76x02u_pre_tbtt_work+0x96/0x220 [mt76x02_usb]
>>> [ 153.830600] process_one_work+0x1e2/0x3b0
>>> [ 153.830610] worker_thread+0x4a/0x3d0
>>> [ 153.830623] kthread+0xfb/0x130
>>> [ 153.830631] ? process_one_work+0x3b0/0x3b0
>>> [ 153.830639] ? kthread_park+0x90/0x90
>>> [ 153.830650] ret_from_fork+0x22/0x40
>>> [ 153.830665] ---[ end trace 7a658e5cbfd0f9d1 ]---
>>>
>>> Markus
>>>
>> In my current local changes I've decoupled checking csa_check and mt76_csa_finish, like it is in the mmio case. As usb has no tbtt interrupt,
>> I just schedule a delayed work around the estimated beacon transmission time and finish csa there. I'll send another series, if this works.
> I would prefer not to add yet another delayed work. Does the warning
> still happen if you arrange code like this?
>
> mt76x02_mac_set_beacon_prepare(dev);
>
> ieee80211_iterate_active_interfaces(mt76_hw(dev),
> IEEE80211_IFACE_ITER_RESUME_ALL,
> mt76x02_update_beacon_iter, dev);
>
> mt76_csa_check(&dev->mt76);
> if (dev->mt76.csa_complete) {
> mt76_csa_finish(&dev->mt76);
> goto out;
> }
>
> nbeacons = hweight8(dev->mt76.beacon_mask);
> mt76x02_enqueue_buffered_bc(dev, &data, N_BCN_SLOTS - nbeacons);
> ...
> out:
> mt76x02_mac_set_beacon_finish(dev);
> mt76x02u_restart_pre_tbtt_timer(dev);
>
>
You're code works, if I add some locking. ieee80211_iterate_active_interfaces -> ieee80211_iterate_active_interfaces_atomic did the trick for me. Otherwise I get the dmesg output from above.
After using ieee80211_iterate_active_interfaces_atomic I got the following dmesg output after/while a channel switch:
[ 63.115806] divide error: 0000 [#1] PREEMPT SMP NOPTI
[ 63.121054] CPU: 0 PID: 225 Comm: kworker/u8:2 Tainted: G W 5.4.0-rc7-1-01110-g19b7e21c55c8 #39
[ 63.131331] Hardware name: PC Engines apu2/apu2, BIOS v4.10.0.3 11/07/2019
[ 63.138399] Workqueue: mt76u mt76u_tx_status_data [mt76_usb]
[ 63.144258] RIP: 0010:mt76_calc_rx_airtime+0x12b/0x150 [mt76]
[ 63.150281] Code: 8d 34 76 48 8d 34 b1 0f b6 4e 07 66 85 c9 74 25 66 83 f9 01 75 1c b9 24 00 00 00 89 d0 0f b7 76 04 c1 e0 05 8d 04 d0 01 c0 99 <f7> fe 01 c8 c3 31 c0 c3 0f 0b c3 44 89 c8 83 e0 01 3c 01 19 c9 83
[ 63.169699] RSP: 0018:ffffbd694032fcf0 EFLAGS: 00010216
[ 63.175176] RAX: 0000000000002850 RBX: 0000000000000001 RCX: 00000000000000ca
[ 63.182535] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffa20068253538
[ 63.189983] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[ 63.197381] R10: 0000000000000000 R11: ffffbd694032fcb0 R12: ffffbd694032fdb0
[ 63.204782] R13: 0000000000000000 R14: ffffbd694032fd00 R15: ffffa20068251e40
[ 63.212228] FS: 0000000000000000(0000) GS:ffffa2006aa00000(0000) knlGS:0000000000000000
[ 63.220614] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 63.226500] CR2: 00007fe65ba85cb0 CR3: 00000001293b6000 CR4: 00000000000406f0
[ 63.233841] Call Trace:
[ 63.236410] mt76_calc_tx_airtime+0xf4/0x190 [mt76]
[ 63.241464] mt76x02_send_tx_status+0x1cd/0x3f0 [mt76x02_lib]
[ 63.247430] mt76x02_tx_status_data+0x54/0x80 [mt76x02_lib]
[ 63.253186] mt76u_tx_status_data+0x63/0xc0 [mt76_usb]
[ 63.258451] process_one_work+0x1e2/0x3b0
[ 63.262533] worker_thread+0x4a/0x3d0
[ 63.266306] kthread+0xfb/0x130
[ 63.269550] ? process_one_work+0x3b0/0x3b0
[ 63.273893] ? kthread_park+0x90/0x90
[ 63.277677] ret_from_fork+0x22/0x40
[ 63.281411] Modules linked in: ccm bridge stp llc mt76x2u mt76x2_common mt76x02_usb mt76_usb mt76x02_lib mt76 nft_masq nft_chain_nat nf_nat nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c nf_tables_set nf_tables nfnetlink ath10k_pci ath10k_core amd64_edac_mod edac_mce_amd ath kvm_amd mac80211 kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel pcengines_apuv2 cfg80211 gpio_keys_polled crypto_simd input_polldev gpio_amd_fch cryptd igb glue_helper pcspkr fam15h_power sp5100_tco k10temp i2c_piix4 rfkill i2c_algo_bit ccp libarc4 dca rng_core uio_pdrv_genirq evdev leds_gpio uio mac_hid coreboot_table acpi_cpufreq pinctrl_amd sr_mod cdrom ip_tables x_tables ext4 crc32c_generic crc16 mbcache jbd2 sd_mod usb_storage ahci libahci libata xhci_pci sdhci_pci xhci_hcd scsi_mod cqhci sdhci ehci_pci crc32c_intel ehci_hcd mmc_core gpio_keys
[ 63.365937] ---[ end trace f13e9cdc5f55db9e ]---
[ 63.370802] RIP: 0010:mt76_calc_rx_airtime+0x12b/0x150 [mt76]
[ 63.376807] Code: 8d 34 76 48 8d 34 b1 0f b6 4e 07 66 85 c9 74 25 66 83 f9 01 75 1c b9 24 00 00 00 89 d0 0f b7 76 04 c1 e0 05 8d 04 d0 01 c0 99 <f7> fe 01 c8 c3 31 c0 c3 0f 0b c3 44 89 c8 83 e0 01 3c 01 19 c9 83
[ 63.396220] RSP: 0018:ffffbd694032fcf0 EFLAGS: 00010216
[ 63.401660] RAX: 0000000000002850 RBX: 0000000000000001 RCX: 00000000000000ca
[ 63.409145] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffa20068253538
[ 63.416505] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[ 63.423988] R10: 0000000000000000 R11: ffffbd694032fcb0 R12: ffffbd694032fdb0
[ 63.431425] R13: 0000000000000000 R14: ffffbd694032fd00 R15: ffffa20068251e40
[ 63.438793] FS: 0000000000000000(0000) GS:ffffa2006aa00000(0000) knlGS:0000000000000000
[ 63.447141] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 63.453216] CR2: 00007fe65ba85cb0 CR3: 00000001293b6000 CR4: 00000000000406f0
I would guess, that
mt76_calc_legacy_rate_duration: duration += (len * 10) / rate->bitrate;
triggers this kind of message.
On 11/25/19 7:30 PM, Markus Theil wrote:
> On 11/25/19 6:02 PM, Stanislaw Gruszka wrote:
>> On Mon, Nov 25, 2019 at 04:32:42PM +0100, Markus Theil wrote:
>>> On 11/25/19 3:51 PM, Markus Theil wrote:
>>>> On 11/25/19 2:04 PM, Stanislaw Gruszka wrote:
>>>>> On Thu, Nov 21, 2019 at 07:00:01PM +0100, Markus Theil wrote:
>>>>>> diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
>>>>>> index 90c024f12302..b9bd6bfb2a9d 100644
>>>>>> --- a/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
>>>>>> +++ b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
>>>>>> @@ -210,6 +210,12 @@ static void mt76x02u_pre_tbtt_work(struct work_struct *work)
>>>>>>
>>>>>> mt76x02_mac_set_beacon_prepare(dev);
>>>>>>
>>>>>> + mt76_csa_check(&dev->mt76);
>>>>>> + if (dev->mt76.csa_complete) {
>>>>>> + mt76_csa_finish(&dev->mt76);
>>>>>> + goto out;
>>>>>> + }
>>>>> mmio counterpart setup beacons on CSA, but do not sent buffered
>>>>> PS frames. Perhaps here we should do the same. However not sending
>>>>> beacons on one TBTT looks ok to me as well.
>>>>>
>>>>> Stanislaw
>>>>>
>>>> If I change the order of beacon iteration and csa check, the following warning in mac80211 gets triggered:
>>>>
>>>> /* the counter should never reach 0 */
>>>> WARN_ON_ONCE(!beacon->csa_current_counter);
>>>>
>>>> Dmesg output looks like this:
>>>>
>>>> [ 153.829617] ------------[ cut here ]------------
>>>> [ 153.829752] WARNING: CPU: 0 PID: 224 at net/mac80211/tx.c:4318 __ieee80211_csa_update_counter.isra.0.part.0+0x5/0x10 [mac80211]
>>>> [ 153.829756] Modules linked in: ccm bridge stp llc nft_masq nft_chain_nat nf_nat nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c nf_tables_set nf_tables nfnetlink ath10k_pci amd64_edac_mod mt76x2u edac_mce_amd mt76x2_common ath10k_core mt76x02_usb kvm_amd mt76_usb mt76x02_lib mt76 kvm ath mac80211 irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel cfg80211 pcengines_apuv2 gpio_keys_polled aesni_intel input_polldev crypto_simd gpio_amd_fch cryptd glue_helper igb pcspkr k10temp fam15h_power rfkill sp5100_tco i2c_piix4 libarc4 ccp i2c_algo_bit dca rng_core uio_pdrv_genirq uio leds_gpio evdev mac_hid pinctrl_amd coreboot_table acpi_cpufreq ip_tables x_tables ext4 crc32c_generic crc16 mbcache jbd2 sd_mod ahci sdhci_pci libahci cqhci libata sdhci crc32c_intel xhci_pci ehci_pci mmc_core xhci_hcd scsi_mod ehci_hcd gpio_keys
>>>> [ 153.829948] CPU: 0 PID: 224 Comm: kworker/0:1H Not tainted 5.4.0-rc7-1-01110-g19b7e21c55c8 #32
>>>> [ 153.829952] Hardware name: PC Engines apu2/apu2, BIOS v4.10.0.3 11/07/2019
>>>> [ 153.829966] Workqueue: events_highpri mt76x02u_pre_tbtt_work [mt76x02_usb]
>>>> [ 153.830067] RIP: 0010:__ieee80211_csa_update_counter.isra.0.part.0+0x5/0x10 [mac80211]
>>>> [ 153.830077] Code: 4c 89 4a 18 c3 48 8b 47 10 4c 89 4f 10 48 89 4e 18 48 89 46 20 4c 89 08 eb a1 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 <0f> 0b c3 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 41 54 53 48 89 fb
>>>> [ 153.830082] RSP: 0018:ffffbde8803d7c80 EFLAGS: 00010246
>>>> [ 153.830089] RAX: 0000000000000003 RBX: ffffbde8803d7d20 RCX: ffffa3b01df8f658
>>>> [ 153.830093] RDX: ffffbde8803d7d20 RSI: ffffa3b02901d450 RDI: ffffbde8803d7ce0
>>>> [ 153.830097] RBP: ffffa3b0267007a0 R08: ffffffff8d011040 R09: 0000000000000000
>>>> [ 153.830101] R10: ffffa3b029908098 R11: ffffa3b02ab2ab38 R12: 0000000000000000
>>>> [ 153.830105] R13: ffffa3b02901d450 R14: 0000000000000000 R15: ffffa3b0284eae00
>>>> [ 153.830111] FS: 0000000000000000(0000) GS:ffffa3b02aa00000(0000) knlGS:0000000000000000
>>>> [ 153.830115] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>>> [ 153.830119] CR2: 00007fbb6b5c9f30 CR3: 0000000126ee2000 CR4: 00000000000406f0
>>>> [ 153.830124] Call Trace:
>>>> [ 153.830203] __ieee80211_beacon_get+0x4c2/0x4d0 [mac80211]
>>>> [ 153.830312] ieee80211_beacon_get_tim+0x41/0x150 [mac80211]
>>>> [ 153.830336] mt76x02_update_beacon_iter+0x2d/0x40 [mt76x02_lib]
>>>> [ 153.830352] ? mt76x02_add_buffered_bc+0x80/0x80 [mt76x02_lib]
>>>> [ 153.830420] __iterate_interfaces+0x74/0x110 [mac80211]
>>>> [ 153.830469] ? mt76x02_add_buffered_bc+0x80/0x80 [mt76x02_lib]
>>>> [ 153.830566] ieee80211_iterate_interfaces+0x3a/0x50 [mac80211]
>>>> [ 153.830580] mt76x02u_pre_tbtt_work+0x96/0x220 [mt76x02_usb]
>>>> [ 153.830600] process_one_work+0x1e2/0x3b0
>>>> [ 153.830610] worker_thread+0x4a/0x3d0
>>>> [ 153.830623] kthread+0xfb/0x130
>>>> [ 153.830631] ? process_one_work+0x3b0/0x3b0
>>>> [ 153.830639] ? kthread_park+0x90/0x90
>>>> [ 153.830650] ret_from_fork+0x22/0x40
>>>> [ 153.830665] ---[ end trace 7a658e5cbfd0f9d1 ]---
>>>>
>>>> Markus
>>>>
>>> In my current local changes I've decoupled checking csa_check and mt76_csa_finish, like it is in the mmio case. As usb has no tbtt interrupt,
>>> I just schedule a delayed work around the estimated beacon transmission time and finish csa there. I'll send another series, if this works.
>> I would prefer not to add yet another delayed work. Does the warning
>> still happen if you arrange code like this?
>>
>> mt76x02_mac_set_beacon_prepare(dev);
>>
>> ieee80211_iterate_active_interfaces(mt76_hw(dev),
>> IEEE80211_IFACE_ITER_RESUME_ALL,
>> mt76x02_update_beacon_iter, dev);
>>
>> mt76_csa_check(&dev->mt76);
>> if (dev->mt76.csa_complete) {
>> mt76_csa_finish(&dev->mt76);
>> goto out;
>> }
>>
>> nbeacons = hweight8(dev->mt76.beacon_mask);
>> mt76x02_enqueue_buffered_bc(dev, &data, N_BCN_SLOTS - nbeacons);
>> ...
>> out:
>> mt76x02_mac_set_beacon_finish(dev);
>> mt76x02u_restart_pre_tbtt_timer(dev);
>>
>>
> You're code works, if I add some locking. ieee80211_iterate_active_interfaces -> ieee80211_iterate_active_interfaces_atomic did the trick for me. Otherwise I get the dmesg output from above.
> After using ieee80211_iterate_active_interfaces_atomic I got the following dmesg output after/while a channel switch:
Got the output again, also with ieee80211_iterate_active_interfaces_atomic.
> [ 63.115806] divide error: 0000 [#1] PREEMPT SMP NOPTI
> [ 63.121054] CPU: 0 PID: 225 Comm: kworker/u8:2 Tainted: G W 5.4.0-rc7-1-01110-g19b7e21c55c8 #39
> [ 63.131331] Hardware name: PC Engines apu2/apu2, BIOS v4.10.0.3 11/07/2019
> [ 63.138399] Workqueue: mt76u mt76u_tx_status_data [mt76_usb]
> [ 63.144258] RIP: 0010:mt76_calc_rx_airtime+0x12b/0x150 [mt76]
> [ 63.150281] Code: 8d 34 76 48 8d 34 b1 0f b6 4e 07 66 85 c9 74 25 66 83 f9 01 75 1c b9 24 00 00 00 89 d0 0f b7 76 04 c1 e0 05 8d 04 d0 01 c0 99 <f7> fe 01 c8 c3 31 c0 c3 0f 0b c3 44 89 c8 83 e0 01 3c 01 19 c9 83
> [ 63.169699] RSP: 0018:ffffbd694032fcf0 EFLAGS: 00010216
> [ 63.175176] RAX: 0000000000002850 RBX: 0000000000000001 RCX: 00000000000000ca
> [ 63.182535] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffa20068253538
> [ 63.189983] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
> [ 63.197381] R10: 0000000000000000 R11: ffffbd694032fcb0 R12: ffffbd694032fdb0
> [ 63.204782] R13: 0000000000000000 R14: ffffbd694032fd00 R15: ffffa20068251e40
> [ 63.212228] FS: 0000000000000000(0000) GS:ffffa2006aa00000(0000) knlGS:0000000000000000
> [ 63.220614] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 63.226500] CR2: 00007fe65ba85cb0 CR3: 00000001293b6000 CR4: 00000000000406f0
> [ 63.233841] Call Trace:
> [ 63.236410] mt76_calc_tx_airtime+0xf4/0x190 [mt76]
> [ 63.241464] mt76x02_send_tx_status+0x1cd/0x3f0 [mt76x02_lib]
> [ 63.247430] mt76x02_tx_status_data+0x54/0x80 [mt76x02_lib]
> [ 63.253186] mt76u_tx_status_data+0x63/0xc0 [mt76_usb]
> [ 63.258451] process_one_work+0x1e2/0x3b0
> [ 63.262533] worker_thread+0x4a/0x3d0
> [ 63.266306] kthread+0xfb/0x130
> [ 63.269550] ? process_one_work+0x3b0/0x3b0
> [ 63.273893] ? kthread_park+0x90/0x90
> [ 63.277677] ret_from_fork+0x22/0x40
> [ 63.281411] Modules linked in: ccm bridge stp llc mt76x2u mt76x2_common mt76x02_usb mt76_usb mt76x02_lib mt76 nft_masq nft_chain_nat nf_nat nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c nf_tables_set nf_tables nfnetlink ath10k_pci ath10k_core amd64_edac_mod edac_mce_amd ath kvm_amd mac80211 kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel pcengines_apuv2 cfg80211 gpio_keys_polled crypto_simd input_polldev gpio_amd_fch cryptd igb glue_helper pcspkr fam15h_power sp5100_tco k10temp i2c_piix4 rfkill i2c_algo_bit ccp libarc4 dca rng_core uio_pdrv_genirq evdev leds_gpio uio mac_hid coreboot_table acpi_cpufreq pinctrl_amd sr_mod cdrom ip_tables x_tables ext4 crc32c_generic crc16 mbcache jbd2 sd_mod usb_storage ahci libahci libata xhci_pci sdhci_pci xhci_hcd scsi_mod cqhci sdhci ehci_pci crc32c_intel ehci_hcd mmc_core gpio_keys
> [ 63.365937] ---[ end trace f13e9cdc5f55db9e ]---
> [ 63.370802] RIP: 0010:mt76_calc_rx_airtime+0x12b/0x150 [mt76]
> [ 63.376807] Code: 8d 34 76 48 8d 34 b1 0f b6 4e 07 66 85 c9 74 25 66 83 f9 01 75 1c b9 24 00 00 00 89 d0 0f b7 76 04 c1 e0 05 8d 04 d0 01 c0 99 <f7> fe 01 c8 c3 31 c0 c3 0f 0b c3 44 89 c8 83 e0 01 3c 01 19 c9 83
> [ 63.396220] RSP: 0018:ffffbd694032fcf0 EFLAGS: 00010216
> [ 63.401660] RAX: 0000000000002850 RBX: 0000000000000001 RCX: 00000000000000ca
> [ 63.409145] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffa20068253538
> [ 63.416505] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
> [ 63.423988] R10: 0000000000000000 R11: ffffbd694032fcb0 R12: ffffbd694032fdb0
> [ 63.431425] R13: 0000000000000000 R14: ffffbd694032fd00 R15: ffffa20068251e40
> [ 63.438793] FS: 0000000000000000(0000) GS:ffffa2006aa00000(0000) knlGS:0000000000000000
> [ 63.447141] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 63.453216] CR2: 00007fe65ba85cb0 CR3: 00000001293b6000 CR4: 00000000000406f0
>
> I would guess, that
> mt76_calc_legacy_rate_duration: duration += (len * 10) / rate->bitrate;
> triggers this kind of message.