linux-kernel - 5.10 regression, many XHCI swiotlb buffer is full / DMAR: Device bounce map failed errors on thunderbolt connected XHCI controller

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Date:   Tue, 10 Nov 2020 12:36:47 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb <linux-usb@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-pci@...r.kernel.org
Subject: 5.10 regression, many XHCI swiotlb buffer is full / DMAR: Device
 bounce map failed errors on thunderbolt connected XHCI controller

Hi All,

Not sure if this is a XHCI driver problem at all, but I needed to start
somewhere with reporting this so I went with:

scripts/get_maintainer.pl -f drivers/usb/host/xhci-pci.c

And added a Cc: linux-pci@...r.kernel.org as bonus.

I'm seeing the following errors and very slow network performance with
the USB NIC in a Lenovo Thunderbolt gen 2 dock.

Note that the USB NIC is connected to the XHCI controller which is
embedded inside the dock and is connected over thunderbolt!

So the errors are:

[ 1148.744205] swiotlb_tbl_map_single: 6 callbacks suppressed
[ 1148.744210] xhci_hcd 0000:0a:00.0: swiotlb buffer is full (sz: 8192 bytes), total 32768 (slots), used 16 (slots)
[ 1148.744218] xhci_hcd 0000:0a:00.0: DMAR: Device bounce map: 16ea@...1c0000 dir 1 --- failed
[ 1148.744226] r8152 4-2.1.2:1.0 ens1u2u1u2: failed tx_urb -11
[ 1148.744368] xhci_hcd 0000:0a:00.0: swiotlb buffer is full (sz: 8192 bytes), total 32768 (slots), used 16 (slots)
[ 1148.744375] xhci_hcd 0000:0a:00.0: DMAR: Device bounce map: 16ea@...abc000 dir 1 --- failed
[ 1148.744381] r8152 4-2.1.2:1.0 ens1u2u1u2: failed tx_urb -11
[ 1148.745141] xhci_hcd 0000:0a:00.0: swiotlb buffer is full (sz: 8192 bytes), total 32768 (slots), used 16 (slots)
[ 1148.745148] xhci_hcd 0000:0a:00.0: DMAR: Device bounce map: 118e@...1c0000 dir 1 --- failed
[ 1148.745155] r8152 4-2.1.2:1.0 ens1u2u1u2: failed tx_urb -11
[ 1148.951282] xhci_hcd 0000:0a:00.0: swiotlb buffer is full (sz: 8192 bytes), total 32768 (slots), used 16 (slots)
[ 1148.951388] xhci_hcd 0000:0a:00.0: DMAR: Device bounce map: 118e@...988000 dir 1 --- failed
[ 1148.951420] r8152 4-2.1.2:1.0 ens1u2u1u2: failed tx_urb -11
[ 1151.013342] xhci_hcd 0000:0a:00.0: swiotlb buffer is full (sz: 8192 bytes), total 32768 (slots), used 16 (slots)
[ 1151.013357] xhci_hcd 0000:0a:00.0: DMAR: Device bounce map: 1d2a@...1c0000 dir 1 --- failed
[ 1151.013373] r8152 4-2.1.2:1.0 ens1u2u1u2: failed tx_urb -11
[ 1151.018660] xhci_hcd 0000:0a:00.0: swiotlb buffer is full (sz: 8192 bytes), total 32768 (slots), used 18 (slots)
[ 1151.018696] xhci_hcd 0000:0a:00.0: DMAR: Device bounce map: 11da@...1c0000 dir 1 --- failed
[ 1151.018711] r8152 4-2.1.2:1.0 ens1u2u1u2: failed tx_urb -11
[ 1151.223022] xhci_hcd 0000:0a:00.0: swiotlb buffer is full (sz: 8192 bytes), total 32768 (slots), used 16 (slots)
[ 1151.223102] xhci_hcd 0000:0a:00.0: DMAR: Device bounce map: 11da@...abc000 dir 1 --- failed
[ 1151.223133] r8152 4-2.1.2:1.0 ens1u2u1u2: failed tx_urb -11
[ 1151.228810] xhci_hcd 0000:0a:00.0: swiotlb buffer is full (sz: 8192 bytes), total 32768 (slots), used 16 (slots)
[ 1151.228870] xhci_hcd 0000:0a:00.0: DMAR: Device bounce map: 11da@...abc000 dir 1 --- failed
[ 1151.228898] r8152 4-2.1.2:1.0 ens1u2u1u2: failed tx_urb -11
[ 1151.234792] xhci_hcd 0000:0a:00.0: swiotlb buffer is full (sz: 8192 bytes), total 32768 (slots), used 16 (slots)
[ 1151.234852] xhci_hcd 0000:0a:00.0: DMAR: Device bounce map: 11da@...abc000 dir 1 --- failed
[ 1151.234882] r8152 4-2.1.2:1.0 ens1u2u1u2: failed tx_urb -11

etc.

This happens as soon as I generate any serious amount of outgoing network traffic. E.g. rsyncing files
to another machine.

Regards,

Hans