Re: [PATCH net-next v9 0/4] net: stmmac: Add PCI driver support for BCM8958x

Russell King (Oracle)
2026-04-07T07:25:37Z

On Thu, Apr 02, 2026 at 02:36:25PM -0700, Jitendra Vegiraju wrote:
> From: Jitendra Vegiraju <jitendra.vegiraju@broadcom.com>
>
> This patchset adds basic PCI ethernet device driver support for Broadcom
> BCM8958x Automotive Ethernet switch SoC devices.
>
> This SoC device has PCIe ethernet MAC attached to an integrated ethernet
> switch using XGMII interface. The PCIe ethernet controller is presented to
> the Linux host as PCI network device.
> Management of integrated ethernet switch on this SoC is not handled via
> the PCIe interface.
>
> The following block diagram gives an overview of the application.
> +=================================+
> | Host CPU/Linux |
> +=================================+
> || PCIe
> ||
> +==========================================+
> | +--------------+ |
> | | PCIE Endpoint| |
> | | Ethernet | |
> | | Controller | |
> | | DMA | |
> | +--------------+ |
> | | MAC | BCM8958X |
> | +--------------+ SoC |
> | || XGMII |
> | || |
> | +--------------+ |
> | | Ethernet | |
> | | switch | |
> | +--------------+ |
> | || || || || |
> +==========================================+
> || || || || More external interfaces
>
> The MAC block on BCM8958x is based on Synopsis XGMAC 4.00a core. This
> MAC IP introduces new DMA architecture called Hyper-DMA for virtualization
> scalability.
>
> Driver functionality specific to new MAC (DW25GMAC) is implemented in
> new file dw25gmac.c.

Sorry for suggesting this rather late, but I recently came across
another stmmac driver in the kernel - drivers/net/ethernet/synopsys.
This is for XLGMAC, but I wonder whether it may be a better bet for
this core. Have you looked at it?

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