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
