Andre- Thank you for the detailed report! Tom- There is a rich set of trace points available in the RPC/RDMA implementation in 5.4/5.5, fwiw. Please keep me in the loop, let me know if there is anything I can do to help. > On Feb 11, 2020, at 2:25 AM, Joerg Roedel <jroedel@xxxxxxx> wrote: > > Adding Tom's new email address. > > Tom, can you have a look, please? > https://bugzilla.kernel.org/show_bug.cgi?id=206461 seems to be a similar > issue. > > On Tue, Feb 11, 2020 at 06:06:54AM +0100, Andre Tomt wrote: >> Since upgrading my RDMA lab from kernel 5.4.x to 5.5.x, NFSv4 over RDMA >> stopped working. But only on my AMD Ryzen systems. And so far only NFS, >> curiously other RDMA diagnostic tools (like qperf <ip> -cm1 rc_bw) work >> fine. >> >> A git bisect points to be62dbf554c5b50718a54a359372c148cd9975c7 iommu/amd: >> Convert AMD iommu driver to the dma-iommu api >> >> 5.5.3-rc1, 5.6-rc1 are also not working. >> >> I verified it by booting with amd_iommu=off on the kernel cmdline - it makes >> everything work again. >> >> The NFS config is a pretty simple NFSv4.x only, sec=sys setup, running over >> RoCEv1 on Mellanox mlx4 hardware (ConnectX-3 Pro, fw 2.42.5000). Nothing >> fancy besides the RoCEv1 and related bits network bits like PFC and storage >> VLAN. Bare metal, no virtualization. >> >> The impacted systems are: >> ASUS ROG STRIX X399-E GAMING, with a Threadripper 1950x, BIOS 1002 >> ASUS Pro WS X570-ACE, with a Ryzen 7 3700x, BIOS 1201 >> >> pcaps off a mirror port can be provided. They show that on 5.5.x, CM >> succeeds, and then a couple of NFS NULL calls comes through (over RoCE), >> both acked, and then the rest just never goes out from the client until the >> mount times out and CM is torn down. >> >> No messages shows up in the kernel log on either side. I was at least >> expecting some scary IOMMU warnings. >> >> More serious hardware is not available for RDMA testing currently, so I dont >> know if a EPYC system or newer mlx5 cards would have similar issues. Intel >> I've only tested as server so far, that worked fine, as expected given the >> bisect result. >> >> >>> git bisect start >>> # bad: [d5226fa6dbae0569ee43ecfc08bdcd6770fc4755] Linux 5.5 >>> git bisect bad d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 >>> # good: [219d54332a09e8d8741c1e1982f5eae56099de85] Linux 5.4 >>> git bisect good 219d54332a09e8d8741c1e1982f5eae56099de85 >>> # good: [8c39f71ee2019e77ee14f88b1321b2348db51820] Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net >>> git bisect good 8c39f71ee2019e77ee14f88b1321b2348db51820 >>> # bad: [76bb8b05960c3d1668e6bee7624ed886cbd135ba] Merge tag 'kbuild-v5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild >>> git bisect bad 76bb8b05960c3d1668e6bee7624ed886cbd135ba >>> # good: [21b26d2679584c6a60e861aa3e5ca09a6bab0633] Merge tag '5.5-rc-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6 >>> git bisect good 21b26d2679584c6a60e861aa3e5ca09a6bab0633 >>> # good: [e5b3fc125d768eacd73bb4dc5019f0ce95635af4] Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip >>> git bisect good e5b3fc125d768eacd73bb4dc5019f0ce95635af4 >>> # bad: [937d6eefc716a9071f0e3bada19200de1bb9d048] Merge tag 'docs-5.5a' of git://git.lwn.net/linux >>> git bisect bad 937d6eefc716a9071f0e3bada19200de1bb9d048 >>> # bad: [1daa56bcfd8b329447e0c1b1e91c3925d08489b7] Merge tag 'iommu-updates-v5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu >>> git bisect bad 1daa56bcfd8b329447e0c1b1e91c3925d08489b7 >>> # good: [937790699be9c8100e5358625e7dfa8b32bd33f2] mm/page_io.c: annotate refault stalls from swap_readpage >>> git bisect good 937790699be9c8100e5358625e7dfa8b32bd33f2 >>> # good: [a5255bc31673c72e264d837cd13cd3085d72cb58] Merge tag 'dmaengine-5.5-rc1' of git://git.infradead.org/users/vkoul/slave-dma >>> git bisect good a5255bc31673c72e264d837cd13cd3085d72cb58 >>> # good: [34d1b0895dbd10713c73615d8f532e78509e12d9] iommu/arm-smmu: Remove duplicate error message >>> git bisect good 34d1b0895dbd10713c73615d8f532e78509e12d9 >>> # bad: [3c124435e8dd516df4b2fc983f4415386fd6edae] iommu/amd: Support multiple PCI DMA aliases in IRQ Remapping >>> git bisect bad 3c124435e8dd516df4b2fc983f4415386fd6edae >>> # bad: [be62dbf554c5b50718a54a359372c148cd9975c7] iommu/amd: Convert AMD iommu driver to the dma-iommu api >>> git bisect bad be62dbf554c5b50718a54a359372c148cd9975c7 >>> # good: [781ca2de89bae1b1d2c96df9ef33e9a324415995] iommu: Add gfp parameter to iommu_ops::map >>> git bisect good 781ca2de89bae1b1d2c96df9ef33e9a324415995 >>> # good: [6e2350207f40e24884da262976f7fd4fba387e8a] iommu/dma-iommu: Use the dev->coherent_dma_mask >>> git bisect good 6e2350207f40e24884da262976f7fd4fba387e8a >>> # first bad commit: [be62dbf554c5b50718a54a359372c148cd9975c7] iommu/amd: Convert AMD iommu driver to the dma-iommu api -- Chuck Lever
