netdev - Re: [PATCH net-next v2 0/3] Introducing Intercore Virtual Ethernet (ICVE) driver

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Date: Mon, 3 Jun 2024 16:54:03 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Yojana Mallik <y-mallik@...com>
Cc: Andrew Lunn <andrew@...n.ch>, schnelle@...ux.ibm.com,
 wsa+renesas@...g-engineering.com, diogo.ivo@...mens.com,
 rdunlap@...radead.org, horms@...nel.org, vigneshr@...com, rogerq@...com,
 danishanwar@...com, pabeni@...hat.com, edumazet@...gle.com,
 davem@...emloft.net, netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 srk@...com, rogerq@...nel.org
Subject: Re: [PATCH net-next v2 0/3] Introducing Intercore Virtual Ethernet
 (ICVE) driver

On Sun, 2 Jun 2024 17:45:29 +0200 Andrew Lunn wrote:
> On Fri, May 31, 2024 at 12:10:03PM +0530, Yojana Mallik wrote:
> > virtio-net provides a solution for virtual ethernet interface in a
> > virtualized environment.
> > 
> > There might be a use-case for traffic tunneling between heterogeneous
> > processors in a non virtualized environment such as TI's AM64x that has
> > Cortex A53 and Cortex R5 where Linux runs on A53 and a flavour of RTOS
> > on R5(FreeRTOS) and the ethernet controller is managed by R5 and needs
> > to pass some low priority data to A53.
> > 
> > One solution for such an use case where the ethernet controller does
> > not support DMA for Tx/Rx channel, could be a RPMsg based shared memory
> > ethernet driver.  
> 
> virtio-net is very generic and vendor agnostic.
> 
> Looking at icve, what is TI specific? Why not define a generic
> solution which could be used for any heterogeneous system? We are
> seeming more and more such systems, and there is no point everybody
> re-inventing the wheel. So what i would like to see is something
> similar to driver/tty/rpmsg_tty.c, a driver/net/ethernet/rpmsg_eth.c,
> with good documentation of the protocol used, so that others can
> implement it. And since you say you have FreeRTOS on the other end,
> you could also contribute that side to FreeRTOS as well. A complete
> open source solution everybody can use.

100% agreed! FWIW there's also a PCIe NTB driver which provides very
similar functionality.