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Date: Thu, 29 Sep 2016 07:47:30 -0700
From: Ben Greear <greearb@candelatech.com>
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To: Matteo Grandi <iu5bdp@gmail.com>,
        LinuxWireless Mailing List <linux-wireless@vger.kernel.org>
Subject: Re: ath10k stuck on 6Mbps and spam syslog
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stock ath10k firmware does not report tx-rate so the kernel always sees 6Mbps.

I don't know about the splat..maybe post the function
that is causing that?

/home/matteo/linux-imx6/backports4.4.2-i2CAT/net/mac80211/util.c:2621

Thanks,
Ben

On 09/29/2016 06:39 AM, Matteo Grandi wrote:
> Hello all,
>
> I'm struggling with a problem related on ath10k drivers:
> I'm using a Compex WLE600V5-27 (802.11ac) miniPCIe card for some HT
> tests needed for my thesis.
> I'm using ath10k drivers for this card, and backports-4.4.2, in
> particular the firmware-5.bin_10.2.4.70.54 because it seem to be the
> more recent.
> I've connected in mesh mode the WLE600V5 card with an 802.11n card
> (using ath9k drivers) but looking at the station dump, the tx bitrate
> is stuck on 6.0 Mbit/s for the ath10k. The ath9k one works well and
> watch -n1 iw <interfacename> station dump
> let me see changes of the tx rate and MCS on the ath9k during iperf
> tests, but the ath10k stucks on 6.0 Mbit/s.
>
> Then something misterious (for me) happen while the channel
> assignment: the syslog is spammed by this message:
>
> [17554.919459] ------------[ cut here ]------------
> [17554.919839] WARNING: CPU: 0 PID: 0 at
> /home/matteo/linux-imx6/backports4.4.2-i2CAT/net/mac80211/util.c:2621
> ieee80211_calculate_rx_timestamp+0x204/0x278 [mac80211]()
> [17554.919855] Modules linked in: arc4 sky2 ath10k_pci(O)
> ath10k_core(O) ath(O) mac80211(O) cfg80211(O) compat(O)
> [17554.919926] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G        W  O
> 3.14.48-g408ccb9 #4
> [17554.919990] [<80015050>] (unwind_backtrace) from [<80011330>]
> (show_stack+0x10/0x14)
> [17554.920038] [<80011330>] (show_stack) from [<806537dc>]
> (dump_stack+0x80/0x90)
> [17554.920074] [<806537dc>] (dump_stack) from [<8002c578>]
> (warn_slowpath_common+0x6c/0x88)
> [17554.920103] [<8002c578>] (warn_slowpath_common) from [<8002c630>]
> (warn_slowpath_null+0x1c/0x24)
> [17554.920377] [<8002c630>] (warn_slowpath_null) from [<7f089c74>]
> (ieee80211_calculate_rx_timestamp+0x204/0x278 [mac80211])
> [17554.920826] [<7f089c74>] (ieee80211_calculate_rx_timestamp
> [mac80211]) from [<7f07d724>] (ieee80211_rx_napi+0xcc/0x8d4
> [mac80211])
> [17554.921259] [<7f07d724>] (ieee80211_rx_napi [mac80211]) from
> [<7f117fd0>] (ath10k_wmi_event_mgmt_rx+0x1f4/0x35c [ath10k_core])
> [17554.921540] [<7f117fd0>] (ath10k_wmi_event_mgmt_rx [ath10k_core])
> from [<7f10d844>] (ath10k_htc_rx_completion_handler+0x1cc/0x464
> [ath10k_core])
> [17554.921706] [<7f10d844>] (ath10k_htc_rx_completion_handler
> [ath10k_core]) from [<7f157b4c>] (ath10k_pci_process_rx_cb+0x1ac/0x1fc
> [ath10k_pci])
> [17554.921773] [<7f157b4c>] (ath10k_pci_process_rx_cb [ath10k_pci])
> from [<7f15b3ac>] (ath10k_ce_per_engine_service+0x5c/0x94
> [ath10k_pci])
> [17554.921835] [<7f15b3ac>] (ath10k_ce_per_engine_service
> [ath10k_pci]) from [<7f15b464>]
> (ath10k_ce_per_engine_service_any+0x80/0x88 [ath10k_pci])
> [17554.921892] [<7f15b464>] (ath10k_ce_per_engine_service_any
> [ath10k_pci]) from [<7f15a6d8>] (ath10k_pci_tasklet+0x24/0x5c
> [ath10k_pci])
> [17554.921946] [<7f15a6d8>] (ath10k_pci_tasklet [ath10k_pci]) from
> [<800304c8>] (tasklet_action+0x80/0x110)
> [17554.921979] [<800304c8>] (tasklet_action) from [<800306b8>]
> (__do_softirq+0x10c/0x248)
> [17554.922009] [<800306b8>] (__do_softirq) from [<80030a6c>]
> (irq_exit+0xac/0xf4)
> [17554.922042] [<80030a6c>] (irq_exit) from [<8000e904>] (handle_IRQ+0x44/0x90)
> [17554.922072] [<8000e904>] (handle_IRQ) from [<800084f8>]
> (gic_handle_irq+0x2c/0x5c)
> [17554.922105] [<800084f8>] (gic_handle_irq) from [<80011e00>]
> (__irq_svc+0x40/0x50)
> [17554.922122] Exception stack(0x80917f18 to 0x80917f60)
> [17554.922141] 7f00:
>      80917f60 000d3334
> [17554.922166] 7f20: 5221e106 00000ff7 4d693c44 00000ff7 a7705010
> 80924060 00000001 a7705014
> [17554.922190] 7f40: 8096243d 80916000 00000017 80917f60 a6aaaaab
> 80492940 60000013 ffffffff
> [17554.922224] [<80011e00>] (__irq_svc) from [<80492940>]
> (cpuidle_enter_state+0x50/0xe0)
> [17554.922252] [<80492940>] (cpuidle_enter_state) from [<80492ac8>]
> (cpuidle_idle_call+0xf8/0x148)
> [17554.922281] [<80492ac8>] (cpuidle_idle_call) from [<8000ec48>]
> (arch_cpu_idle+0x8/0x44)
> [17554.922322] [<8000ec48>] (arch_cpu_idle) from [<80066648>]
> (cpu_startup_entry+0xfc/0x140)
> [17554.922362] [<80066648>] (cpu_startup_entry) from [<808c5b08>]
> (start_kernel+0x360/0x36c)
> [17554.922379] ---[ end trace 87d4775146813aed ]---
> [17555.943454] ------------[ cut here ]------------
>
> that repeat continuously...
> Forcing legacy bitrates doesn't change the situation.
>
> I made some measurements using iperf, please find it in attachment.
>
> Other info:
>
> root@Yazi:~# modinfo ath10k_pci
> filename:
> /lib/modules/3.14.48-g408ccb9/kernel/drivers/net/wireless/ath/ath10k/ath10k_pci.ko
> firmware:       ath10k/QCA9377/hw1.0/board.bin
> firmware:       ath10k/QCA9377/hw1.0/firmware-5.bin
> firmware:       ath10k/QCA6174/hw3.0/board-2.bin
> firmware:       ath10k/QCA6174/hw3.0/board.bin
> firmware:       ath10k/QCA6174/hw3.0/firmware-5.bin
> firmware:       ath10k/QCA6174/hw3.0/firmware-4.bin
> firmware:       ath10k/QCA6174/hw2.1/board-2.bin
> firmware:       ath10k/QCA6174/hw2.1/board.bin
> firmware:       ath10k/QCA6174/hw2.1/firmware-5.bin
> firmware:       ath10k/QCA6174/hw2.1/firmware-4.bin
> firmware:       ath10k/QCA988X/hw2.0/board-2.bin
> firmware:       ath10k/QCA988X/hw2.0/board.bin
> firmware:       ath10k/QCA988X/hw2.0/firmware-5.bin
> firmware:       ath10k/QCA988X/hw2.0/firmware-4.bin
> firmware:       ath10k/QCA988X/hw2.0/firmware-3.bin
> firmware:       ath10k/QCA988X/hw2.0/firmware-2.bin
> firmware:       ath10k/QCA988X/hw2.0/firmware.bin
> license:        Dual BSD/GPL
> description:    Driver support for Atheros QCA988X PCIe devices
> author:         Qualcomm Atheros
> version:        backported from Linux (v4.4.2-0-g1cb8570) using
> backports v4.4.2-1-0-gbec4037
> srcversion:     EBB3D4E36DE49B7EC8057D0
> alias:          pci:v0000168Cd00000042sv*sd*bc*sc*i*
> alias:          pci:v0000168Cd00000040sv*sd*bc*sc*i*
> alias:          pci:v0000168Cd0000003Esv*sd*bc*sc*i*
> alias:          pci:v0000168Cd00000041sv*sd*bc*sc*i*
> alias:          pci:v0000168Cd0000003Csv*sd*bc*sc*i*
> depends:        ath10k_core,compat
> vermagic:       3.14.48-g408ccb9 SMP mod_unload modversions ARMv7 p2v8
> parm:           irq_mode:0: auto, 1: legacy, 2: msi (default: 0) (uint)
> parm:           reset_mode:0: auto, 1: warm only (default: 0) (uint)
>
> I don't know if it's only a problem of iw station dump that can't show
> the tx rate, but the spammed syslog honestly warn me...
>
> How shall I check what's wrong and see the HT work?
>
> Thanks a lot!
>
> Matteo
>

-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com