Hi Will, On 06/10/17 01:19, Will Trives wrote: > Hello, > > Just reporting that it looks like this patch may fix the error (so > people having issues with VIA controller hosts may also want to try it): > > https://lists.linuxfoundation.org/pipermail/iommu/2017-September/024371.html > > It appears that my ax88179 is working just fine now with the vendor > driver. So perhaps it's possible to revert the old commit in the linux > kernel and allow the use of scatter gather ? (perhaps for non-intel > hosts ? I'm not sure if this device is effected by intel xhci errata) Thanks for the tip-off - as luck would have it I have an AX88179 dongle to hand! Does the out-of-tree driver behave significantly differently to the mainline driver (CONFIG_USB_NET_AX88179_178A)? I stuck a PCIe USB3 card into my arm64 dev board and brought up the ASIX dongle with 4.14-rc3 and the mainline driver - with some added debug checks it's definitely not hitting the same sg->offset > PAGE_SIZE case as the crypto drivers which prompted the above patch, but I *do* see an out-of-bounds DMA access under network load which looks a lot like a buffer overrun from the XHCI controller: [ 41.324904] arm-smmu 2b500000.iommu: Unhandled context fault: fsr=0x2, iova=0xfff49000, fsynr=0x183, cb=0 This is fairly easy to reproduce with iperf, so I'll dig in and see how it's related. Cheers, Robin. > commit: e2ed511400d41e0d136089d5a55ceab57c6a2426 > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e2ed511400d41e0d136089d5a55ceab57c6a2426 > > > ethtool -k enp2s0u1u4 > Features for enp2s0u1u4: > Cannot get device udp-fragmentation-offload settings: Operation not supported > rx-checksumming: off [fixed] > tx-checksumming: on > tx-checksum-ipv4: on > tx-checksum-ip-generic: off [fixed] > tx-checksum-ipv6: on > tx-checksum-fcoe-crc: off [fixed] > tx-checksum-sctp: off [fixed] > scatter-gather: on > tx-scatter-gather: on > tx-scatter-gather-fraglist: off [fixed] > tcp-segmentation-offload: on > tx-tcp-segmentation: on > tx-tcp-ecn-segmentation: off [fixed] > tx-tcp-mangleid-segmentation: off > tx-tcp6-segmentation: off [fixed] > udp-fragmentation-offload: off > generic-segmentation-offload: on > generic-receive-offload: on > large-receive-offload: off [fixed] > rx-vlan-offload: off [fixed] > tx-vlan-offload: off [fixed] > ntuple-filters: off [fixed] > receive-hashing: off [fixed] > highdma: off [fixed] > rx-vlan-filter: off [fixed] > vlan-challenged: off [fixed] > tx-lockless: off [fixed] > netns-local: off [fixed] > tx-gso-robust: off [fixed] > tx-fcoe-segmentation: off [fixed] > tx-gre-segmentation: off [fixed] > tx-gre-csum-segmentation: off [fixed] > tx-ipxip4-segmentation: off [fixed] > tx-ipxip6-segmentation: off [fixed] > tx-udp_tnl-segmentation: off [fixed] > tx-udp_tnl-csum-segmentation: off [fixed] > tx-gso-partial: off [fixed] > tx-sctp-segmentation: off [fixed] > tx-esp-segmentation: off [fixed] > fcoe-mtu: off [fixed] > tx-nocache-copy: off > loopback: off [fixed] > rx-fcs: off [fixed] > rx-all: off [fixed] > tx-vlan-stag-hw-insert: off [fixed] > rx-vlan-stag-hw-parse: off [fixed] > rx-vlan-stag-filter: off [fixed] > l2-fwd-offload: off [fixed] > hw-tc-offload: off [fixed] > esp-hw-offload: off [fixed] > esp-tx-csum-hw-offload: off [fixed] > rx-udp_tunnel-port-offload: off [fixed] > > > Regards, > > > Will > > On Fri, 29 Sep 2017 09:58:07 +1000 > Will Trives <renevant@xxxxxxxxxxxxxxxx> wrote: > >> Hello, >> >> I just saw a post about VIA controllers triggering IOMMU errors. >> >> >> Just want to also point out that the ax88179 will also trigger PTE >> read errors when using the vendor's driver. >> >> I'm nowhere near an expert but I remember seeing that 'TD fragment' is >> supported now or some such, which I take to mean that sg/tso should be >> supported with usbnet ? >> >> I'm unclear on whether it can ever work with intel hosts because of an >> errata ? >> >> Anyway for anyone that wants to see the error you can grab the vendor >> driver: >> >> http://www.asix.com.tw/FrootAttach/driver/AX88179_178A_LINUX_DRIVER_v1.18.0_SOURCE.tar.bz2 >> >> >> This driver was working recently-ish perhaps around the same time the >> VIA controllers starting having iommu issues. >> >> >> Regards, >> >> >> Will >> >> > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
