Re: [PATCH net-next v6 4/4] net: ocelot: add FDMA support

[Vladimir Oltean]

On Tue, Dec 07, 2021 at 04:48:39PM +0100, Clément Léger wrote:
> Ethernet frames can be extracted or injected autonomously to or from
> the device’s DDR3/DDR3L memory and/or PCIe memory space. Linked list
> data structures in memory are used for injecting or extracting Ethernet
> frames. The FDMA generates interrupts when frame extraction or
> injection is done and when the linked lists need updating.
> 
> The FDMA is shared between all the ethernet ports of the switch and
> uses a linked list of descriptors (DCB) to inject and extract packets.
> Before adding descriptors, the FDMA channels must be stopped. It would
> be inefficient to do that each time a descriptor would be added so the
> channels are restarted only once they stopped.
> 
> Both channels uses ring-like structure to feed the DCBs to the FDMA.
> head and tail are never touched by hardware and are completely handled
> by the driver. On top of that, page recycling has been added and is
> mostly taken from gianfar driver.
> 
> Co-developed-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
> Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
> Signed-off-by: Clément Léger <clement.leger@xxxxxxxxxxx>
> ---

Looks good to me, thanks!

Reviewed-by: Vladimir Oltean <vladimir.oltean@xxxxxxx>