netdev - Re: ixgbe hangs when XDP

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Date:   Tue, 21 Aug 2018 08:58:15 -0700
From:   Alexander Duyck <alexander.duyck@...il.com>
To:     tehnerd@...nerd.com
Cc:     Netdev <netdev@...r.kernel.org>,
        "Duyck, Alexander H" <alexander.h.duyck@...el.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: Re: ixgbe hangs when XDP_TX is enabled

On Mon, Aug 20, 2018 at 12:32 PM Nikita V. Shirokov <tehnerd@...nerd.com> wrote:
>
> we are getting such errors:
>
> [  408.737313] ixgbe 0000:03:00.0 eth0: Detected Tx Unit Hang (XDP)
>                  Tx Queue             <46>
>                  TDH, TDT             <0>, <2>
>                  next_to_use          <2>
>                  next_to_clean        <0>
>                tx_buffer_info[next_to_clean]
>                  time_stamp           <0>
>                  jiffies              <1000197c0>
> [  408.804438] ixgbe 0000:03:00.0 eth0: tx hang 1 detected on queue 46, resetting adapter
> [  408.804440] ixgbe 0000:03:00.0 eth0: initiating reset due to tx timeout
> [  408.817679] ixgbe 0000:03:00.0 eth0: Reset adapter
> [  408.866091] ixgbe 0000:03:00.0 eth0: TXDCTL.ENABLE for one or more queues not cleared within the polling period
> [  409.345289] ixgbe 0000:03:00.0 eth0: detected SFP+: 3
> [  409.497232] ixgbe 0000:03:00.0 eth0: NIC Link is Up 10 Gbps, Flow Control: RX/TX
>
> while running XDP prog on ixgbe nic.
> right now i'm seing this on bpfnext kernel
> (latest commit from Wed Aug 15 15:04:25 2018 -0700 ;
> 9a76aba02a37718242d7cdc294f0a3901928aa57)
>
> looks like this is the same issue as reported by Brenden in
> https://www.spinics.net/lists/netdev/msg439438.html
>
> --
> Nikita V. Shirokov

Could you provide some additional information about your setup.
Specifically useful would be "ethtool -i", "ethtool -l", and lspci
-vvv info for your device. The total number of CPUs on the system
would be useful to know as well. In addition could you try reproducing
the issue with one of the sample XDP programs provided with the kernel
such as the xdp2 which I believe uses the XDP_TX function. We need to
try and create a similar setup in our own environment for reproduction
and debugging.

Thanks.

- Alex