[PATCH v2 1/4] phy: Add support for the NC-SI protocol

[Joel Stanley]

On Tue, 18 Jun 2019 at 01:37, Samuel Mendoza-Jonas <sam at mendozajonas.com> wrote:
>
> This introduces support for the NC-SI protocol, modelled as a phy driver
> for other ethernet drivers to consume.
>
> NC-SI (Network Controller Sideband Interface) is a protocol to manage a
> sideband connection to a proper network interface, for example a BMC
> (Baseboard Management Controller) sharing the NIC of the host system.
> Probing and configuration occurs by communicating with the "remote" NIC
> via NC-SI control frames (Ethernet header 0x88f8).
>
> This implementation is roughly based on the upstream Linux
> implementation[0], with a reduced feature set and an emphasis on getting
> a link up as fast as possible rather than probing the full possible
> topology of the bus.
> The current phy model relies on the network being "up", sending NC-SI
> command frames via net_send_packet() and receiving them from the
> net_loop() loop (added in a following patch).
>
> The ncsi-pkt.h header[1] is copied from the Linux kernel for consistent
> field definitions.
>
> [0]: https://github.com/torvalds/linux/tree/master/net/ncsi
> [1]: https://github.com/torvalds/linux/blob/master/net/ncsi/ncsi-pkt.h
>
> Signed-off-by: Samuel Mendoza-Jonas <sam at mendozajonas.com>
> ---
> v2:
> - Fix endianess issue when setting MAC address
> - Make checksum offsets easier to read
> - Instantiate per-phy ncsi_priv structures
> - Used update ncsi-pkt.h version to include SPDX header

Thanks, the updates look good.

Reviewed-by: Joel Stanley <joel at jms.id.au>