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SubjectFailure to recreate virtual functions
Date
Hi Lu Baolu,

Our mlx5 driver fails to recreate VFs when cmdline includes
"intel_iommu=on iommu=pt" after recent merge of patch set "iommu/vt-d:
Delegate DMA domain to generic iommu". I've bisected the failure to
patch b7297783c2bb ("iommu/vt-d: Remove duplicated code for device
hotplug"). Here is the dmesg log for following case: enable switchdev
mode, set number of VFs to 0, then set it back to any value
>0.

[ 223.525282] mlx5_core 0000:81:00.0: E-Switch: E-Switch enable SRIOV: nvfs(2) mode (1)
[ 223.562027] mlx5_core 0000:81:00.0: E-Switch: SRIOV enabled: active vports(3)
[ 223.663766] pci 0000:81:00.2: [15b3:101a] type 00 class 0x020000
[ 223.663864] pci 0000:81:00.2: enabling Extended Tags
[ 223.665143] pci 0000:81:00.2: Adding to iommu group 52
[ 223.665215] pci 0000:81:00.2: Using iommu direct mapping
[ 223.665771] mlx5_core 0000:81:00.2: enabling device (0000 -> 0002)
[ 223.665890] mlx5_core 0000:81:00.2: firmware version: 16.26.148
[ 223.889908] mlx5_core 0000:81:00.2: Rate limit: 127 rates are supported, range: 0Mbps to 97656Mbps
[ 223.896438] mlx5_core 0000:81:00.2: MLX5E: StrdRq(1) RqSz(8) StrdSz(2048) RxCqeCmprss(0)
[ 223.896636] mlx5_core 0000:81:00.2: Assigned random MAC address 56:1f:95:e0:51:d6
[ 224.012905] mlx5_core 0000:81:00.2 ens1f0v0: renamed from eth0
[ 224.041651] pci 0000:81:00.3: [15b3:101a] type 00 class 0x020000
[ 224.041711] pci 0000:81:00.3: enabling Extended Tags
[ 224.043660] pci 0000:81:00.3: Adding to iommu group 53
[ 224.043738] pci 0000:81:00.3: Using iommu direct mapping
[ 224.044196] mlx5_core 0000:81:00.3: enabling device (0000 -> 0002)
[ 224.044298] mlx5_core 0000:81:00.3: firmware version: 16.26.148
[ 224.268099] mlx5_core 0000:81:00.3: Rate limit: 127 rates are supported, range: 0Mbps to 97656Mbps
[ 224.274983] mlx5_core 0000:81:00.3: MLX5E: StrdRq(1) RqSz(8) StrdSz(2048) RxCqeCmprss(0)
[ 224.275195] mlx5_core 0000:81:00.3: Assigned random MAC address a6:1e:56:0a:d9:f2
[ 224.388359] mlx5_core 0000:81:00.3 ens1f0v1: renamed from eth0
[ 236.325027] mlx5_core 0000:81:00.0: E-Switch: disable SRIOV: active vports(3) mode(1)
[ 236.362766] mlx5_core 0000:81:00.0: E-Switch: E-Switch enable SRIOV: nvfs(2) mode (2)
[ 237.290066] mlx5_core 0000:81:00.0: MLX5E: StrdRq(1) RqSz(8) StrdSz(2048) RxCqeCmprss(0)
[ 237.350215] mlx5_core 0000:81:00.0: MLX5E: StrdRq(1) RqSz(8) StrdSz(2048) RxCqeCmprss(0)
[ 237.373052] mlx5_core 0000:81:00.0 ens1f0: renamed from eth0
[ 237.390768] mlx5_core 0000:81:00.0: MLX5E: StrdRq(1) RqSz(8) StrdSz(2048) RxCqeCmprss(0)
[ 237.447846] ens1f0_0: renamed from eth0
[ 237.460399] mlx5_core 0000:81:00.0: E-Switch: SRIOV enabled: active vports(3)
[ 237.526880] ens1f0_1: renamed from eth1
[ 248.953873] pci 0000:81:00.2: Removing from iommu group 52
[ 248.954114] pci 0000:81:00.3: Removing from iommu group 53
[ 249.960570] mlx5_core 0000:81:00.0: E-Switch: disable SRIOV: active vports(3) mode(2)
[ 250.319135] mlx5_core 0000:81:00.0: MLX5E: StrdRq(1) RqSz(8) StrdSz(2048) RxCqeCmprss(0)
[ 250.559431] mlx5_core 0000:81:00.0 ens1f0: renamed from eth0
[ 258.819162] mlx5_core 0000:81:00.0: E-Switch: E-Switch enable SRIOV: nvfs(2) mode (1)
[ 258.831625] mlx5_core 0000:81:00.0: E-Switch: SRIOV enabled: active vports(3)
[ 258.936160] pci 0000:81:00.2: [15b3:101a] type 00 class 0x020000
[ 258.936258] pci 0000:81:00.2: enabling Extended Tags
[ 258.937438] pci 0000:81:00.2: Failed to add to iommu group 52: -16
[ 258.938053] mlx5_core 0000:81:00.2: enabling device (0000 -> 0002)
[ 258.938196] mlx5_core 0000:81:00.2: firmware version: 16.26.148
[ 258.938229] mlx5_core 0000:81:00.2: mlx5_function_setup:923:(pid 265): Failed initializing command interface, aborting
[ 258.938315] mlx5_core 0000:81:00.2: init_one:1308:(pid 265): mlx5_load_one failed with error code -12
[ 258.938540] mlx5_core: probe of 0000:81:00.2 failed with error -12
[ 258.938597] pci 0000:81:00.3: [15b3:101a] type 00 class 0x020000
[ 258.938657] pci 0000:81:00.3: enabling Extended Tags
[ 258.939431] pci 0000:81:00.3: Failed to add to iommu group 52: -16
[ 258.939928] mlx5_core 0000:81:00.3: enabling device (0000 -> 0002)
[ 258.940039] mlx5_core 0000:81:00.3: firmware version: 16.26.148
[ 258.940071] mlx5_core 0000:81:00.3: mlx5_function_setup:923:(pid 265): Failed initializing command interface, aborting
[ 258.940158] mlx5_core 0000:81:00.3: init_one:1308:(pid 265): mlx5_load_one failed with error code -12
[ 258.940400] mlx5_core: probe of 0000:81:00.3 failed with error -12


On previous patch 0e31a7266508 ("iommu/vt-d: Remove startup parameter
from device_def_domain_type()") in the series same sequence of actions
doesn't trigger any iommu errors:

[ 164.252254] mlx5_core 0000:81:00.0: E-Switch: E-Switch enable SRIOV: nvfs(2) mode (1)
[ 164.288724] mlx5_core 0000:81:00.0: E-Switch: SRIOV enabled: active vports(3)
[ 164.394839] pci 0000:81:00.2: [15b3:101a] type 00 class 0x020000
[ 164.394938] pci 0000:81:00.2: enabling Extended Tags
[ 164.396087] pci 0000:81:00.2: Adding to iommu group 52
[ 164.396154] pci 0000:81:00.2: Using iommu direct mapping
[ 164.396679] mlx5_core 0000:81:00.2: enabling device (0000 -> 0002)
[ 164.396803] mlx5_core 0000:81:00.2: firmware version: 16.26.148
[ 164.619320] mlx5_core 0000:81:00.2: Rate limit: 127 rates are supported, range: 0Mbps to 97656Mbps
[ 164.625754] mlx5_core 0000:81:00.2: MLX5E: StrdRq(1) RqSz(8) StrdSz(2048) RxCqeCmprss(0)
[ 164.625922] mlx5_core 0000:81:00.2: Assigned random MAC address 5e:1e:9b:ca:c8:e5
[ 164.739694] mlx5_core 0000:81:00.2 ens1f0v0: renamed from eth0
[ 164.774637] pci 0000:81:00.3: [15b3:101a] type 00 class 0x020000
[ 164.774709] pci 0000:81:00.3: enabling Extended Tags
[ 164.775816] pci 0000:81:00.3: Adding to iommu group 53
[ 164.775886] pci 0000:81:00.3: Using iommu direct mapping
[ 164.776610] mlx5_core 0000:81:00.3: enabling device (0000 -> 0002)
[ 164.776734] mlx5_core 0000:81:00.3: firmware version: 16.26.148
[ 164.999360] mlx5_core 0000:81:00.3: Rate limit: 127 rates are supported, range: 0Mbps to 97656Mbps
[ 165.007118] mlx5_core 0000:81:00.3: MLX5E: StrdRq(1) RqSz(8) StrdSz(2048) RxCqeCmprss(0)
[ 165.007327] mlx5_core 0000:81:00.3: Assigned random MAC address 82:4a:7a:5f:81:55
[ 165.123927] mlx5_core 0000:81:00.3 ens1f0v1: renamed from eth0
[ 172.063665] mlx5_core 0000:81:00.0: E-Switch: disable SRIOV: active vports(3) mode(1)
[ 172.103306] mlx5_core 0000:81:00.0: E-Switch: E-Switch enable SRIOV: nvfs(2) mode (2)
[ 173.033033] mlx5_core 0000:81:00.0: MLX5E: StrdRq(1) RqSz(8) StrdSz(2048) RxCqeCmprss(0)
[ 173.091605] mlx5_core 0000:81:00.0: MLX5E: StrdRq(1) RqSz(8) StrdSz(2048) RxCqeCmprss(0)
[ 173.129258] mlx5_core 0000:81:00.0 ens1f0: renamed from eth0
[ 173.129863] mlx5_core 0000:81:00.0: MLX5E: StrdRq(1) RqSz(8) StrdSz(2048) RxCqeCmprss(0)
[ 173.203879] mlx5_core 0000:81:00.0: E-Switch: SRIOV enabled: active vports(3)
[ 173.204002] ens1f0_0: renamed from eth1
[ 173.289454] ens1f0_1: renamed from eth0
[ 186.720692] pci 0000:81:00.2: Removing from iommu group 52
[ 186.720994] pci 0000:81:00.3: Removing from iommu group 53
[ 187.771549] mlx5_core 0000:81:00.0: E-Switch: disable SRIOV: active vports(3) mode(2)
[ 188.141758] mlx5_core 0000:81:00.0: MLX5E: StrdRq(1) RqSz(8) StrdSz(2048) RxCqeCmprss(0)
[ 188.394072] mlx5_core 0000:81:00.0 ens1f0: renamed from eth0
[ 191.116400] mlx5_core 0000:81:00.0: E-Switch: E-Switch enable SRIOV: nvfs(2) mode (1)
[ 191.128965] mlx5_core 0000:81:00.0: E-Switch: SRIOV enabled: active vports(3)
[ 191.235151] pci 0000:81:00.2: [15b3:101a] type 00 class 0x020000
[ 191.235250] pci 0000:81:00.2: enabling Extended Tags
[ 191.236463] pci 0000:81:00.2: Adding to iommu group 52
[ 191.236531] pci 0000:81:00.2: Using iommu direct mapping
[ 191.237037] mlx5_core 0000:81:00.2: enabling device (0000 -> 0002)
[ 191.237161] mlx5_core 0000:81:00.2: firmware version: 16.26.148
[ 191.457369] mlx5_core 0000:81:00.2: Rate limit: 127 rates are supported, range: 0Mbps to 97656Mbps
[ 191.463355] mlx5_core 0000:81:00.2: MLX5E: StrdRq(1) RqSz(8) StrdSz(2048) RxCqeCmprss(0)
[ 191.463509] mlx5_core 0000:81:00.2: Assigned random MAC address e6:f2:0c:b4:e3:2e
[ 191.572884] mlx5_core 0000:81:00.2 ens1f0v0: renamed from eth0
[ 191.608592] pci 0000:81:00.3: [15b3:101a] type 00 class 0x020000
[ 191.608664] pci 0000:81:00.3: enabling Extended Tags
[ 191.609434] pci 0000:81:00.3: Adding to iommu group 53
[ 191.609466] pci 0000:81:00.3: Using iommu direct mapping
[ 191.609760] mlx5_core 0000:81:00.3: enabling device (0000 -> 0002)
[ 191.609862] mlx5_core 0000:81:00.3: firmware version: 16.26.148
[ 191.826324] mlx5_core 0000:81:00.3: Rate limit: 127 rates are supported, range: 0Mbps to 97656Mbps
[ 191.832558] mlx5_core 0000:81:00.3: MLX5E: StrdRq(1) RqSz(8) StrdSz(2048) RxCqeCmprss(0)
[ 191.832730] mlx5_core 0000:81:00.3: Assigned random MAC address a2:dc:76:30:18:6c
[ 191.949625] mlx5_core 0000:81:00.3 ens1f0v1: renamed from eth0

Thanks,
Vlad

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