[Bug 240576] mlxen(4) driver unusable with MT26448

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240576

            Bug ID: 240576
           Summary: mlxen(4) driver unusable with MT26448
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: yoitsmeremember+fbsd at gmail.com

I've installed a Mellanox MT26448 based card, which appears to be recognized:

# dmesg|grep mlx4
mlx4_core0: <mlx4_core> mem 0xdf200000-0xdf2fffff,0xdf800000-0xdfffffff irq 22
at device 0.0 on pci4
mlx4_core: Mellanox ConnectX core driver v3.4.1 (October 2017)
mlx4_core: Initializing mlx4_core
mlx4_core0: Unable to determine PCI device chain minimum BW

# pciconf -lcbv mlx4_core0 at pci0:4:0:0:
mlx4_core0 at pci0:4:0:0:  class=0x020000 card=0x002115b3 chip=0x675015b3 rev=0xb0
hdr=0x00
    vendor     = 'Mellanox Technologies'
    device     = 'MT26448 [ConnectX EN 10GigE, PCIe 2.0 5GT/s]'
    class      = network
    subclass   = ethernet
    bar   [10] = type Memory, range 64, base 0xdf200000, size 1048576, enabled
    bar   [18] = type Prefetchable Memory, range 64, base 0xdf800000, size
8388608, enabled
    cap 01[40] = powerspec 3  supports D0 D3  current D0
    cap 03[48] = VPD
    cap 11[9c] = MSI-X supports 128 messages, enabled
                 Table in map 0x10[0x7c000], PBA in map 0x10[0x7d000]
    cap 10[60] = PCI-Express 2 endpoint max data 128(256) FLR
                 link x8(x8) speed 5.0(5.0) ASPM disabled(L0s)
    ecap 000e[100] = ARI 1
    ecap 0003[148] = Serial 1 0002c90300529b42

However, the interface never appears in ifconfig, and is therefore unusable. 
If it will help I can give devs a remote shell account to a machine with the
card in it.

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