Subject: Re: mlx5: Regression VFs fail to probe on v6.8-rc1

From: Saeed Mahameed <[email-masked]>
Date: Mon, 22 Jan 2024 11:55:29 -0800

On 22 Jan 12:10, Niklas Schnelle wrote:
>Hi Saeed, Hi Leon,
>
>On current v6.8-rc1 on both s390x and on an Intel x86_64 test system
>with a ConnectX-6 DX the mlx5 driver fails to probe for VFs (On x86
>"echo 1 > /sys/bus/pci/devices/<dev>/sriov_numvfs" after a fresh boot
>is enough and is 100% reproducible).
>
>In dmesg I see the following messages (from the Intel server but it's
>basically the same on s390x):
>
>[  110.443950] mlx5_core 0000:6f:00.1: E-Switch: Enable: mode(LEGACY), nvfs(1), necvfs(0), active vports(2)
>[  110.546248] pci 0000:6f:08.2: [15b3:101e] type 00 class 0x020000 PCIe Endpoint
>[  110.546340] pci 0000:6f:08.2: enabling Extended Tags
>[  110.547626] pci 0000:6f:08.2: Adding to iommu group 115
>[  110.553328] mlx5_core 0000:6f:08.2: enabling device (0000 -> 0002)
>[  110.553478] mlx5_core 0000:6f:08.2: firmware version: 22.36.1010
>[  110.718748] mlx5_core 0000:6f:08.2: Rate limit: 127 rates are supported, range: 0Mbps to 97656Mbps
>[  110.730136] mlx5_core 0000:6f:08.2: Assigned random MAC address ce:a6:ec:9e:70:49
>[  110.734351] mlx5_core 0000:6f:08.2: mlx5_cmd_out_err:808:(pid 650): CREATE_TIS(0x912) op_mod(0x0) failed, status bad parameter(0x3), syndrome (0x595b5d), err(-22)
>[  110.735776] mlx5_core 0000:6f:08.2: mlx5e_create_mdev_resources:174:(pid 650): alloc tises failed, -22
>[  110.736819] mlx5_core 0000:6f:08.2: _mlx5e_probe:6076:(pid 650): mlx5e_resume failed, -22
>[  110.749146] mlx5_core.eth: probe of mlx5_core.eth.2 failed with error -22

Hi Niklas,

The following two commits got reverted from net-next, so they are missing
in the current kernel release.

I will resend them as fixes to net branch, hopefully they will make
it to RC2 soon 

https://lore.kernel.org/netdev/[email-masked]/
https://lore.kernel.org/netdev/[email-masked]/