Links:
Commit adding mgb(4) driver URL: https://cgit.freebsd.org/src/commit/?id=8890ab7758b8a03a68f3fe596f6a5446921631a5
Commit connecting mgb(4) module to the build URL: https://cgit.freebsd.org/src/commit/?id=543df609072fe49079c36d6bee510e1645edde3a

Contact: Ed Maste <emaste@freebsd.org>

Microchip’s LAN7430 and LAN7431 are PCIe Gigabit Ethernet interface ICs, with an integrated PHY (LAN7430) or RGMII interface (LAN7431).

In 2019 Gerald ND Aryeetey, a FreeBSD Foundation intern, developed the mgb(4) driver for these devices. It was added to the tree but not yet connected to the build. Since it was committed a number of sweeping iflib changes were made, which included updates to mgb(4).

I have addressed some outstanding issues in the driver, and have now added the module to the build. It is available in -CURRENT snapshot images. The driver is functional, although some additional work is still needed. In particular, configuration of the Receive Filtering Engine, and VLAN and RX/TX checksum offload are required. Caveats and notes are described in the man page.

I am very interested in feedback and test results.

Sponsor: The FreeBSD Foundation