linux-kernel - [PATCH net-next v2 0/3] Introducing Intercore Virtual Ethernet (ICVE) driver

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Date: Fri, 31 May 2024 12:10:03 +0530
From: Yojana Mallik <y-mallik@...com>
To: <y-mallik@...com>, <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>,
        <kuba@...nel.org>, <edumazet@...gle.com>, <davem@...emloft.net>
CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <srk@...com>,
        <rogerq@...nel.org>
Subject: [PATCH net-next v2 0/3] Introducing Intercore Virtual Ethernet (ICVE) driver

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. The data plane is over the shared memory while the control
plane is over RPMsg end point channel.

Two separate regions can be carved out in the shared memory, one for the
A53 -> R5 data path, and other for R5 -> A53 data path.

The shared memory layout is modelled as circular buffer.
-------------------------
|          HEAD         |
-------------------------
|          TAIL         |
-------------------------
|       PKT_1_LEN       |
|         PKT_1         |
-------------------------
|       PKT_2_LEN       |
|         PKT_2         |
-------------------------
|           .           |
|           .           |
-------------------------
|       PKT_N_LEN       |
|         PKT_N         |
-------------------------

Polling mechanism can used to check for the offset between head and
tail index to process the packets by both the cores.

This is the v2 of this series. It addresses comments made on v1.

Changes from v1 to v2:
*) Addressed open comments on v1.
*) Added patch 3/3 to add support for multicast filtering

v1:
https://lore.kernel.org/all/20240130110944.26771-1-r-gunasekaran@ti.com/

Ravi Gunasekaran (1):
  net: ethernet: ti: RPMsg based shared memory ethernet driver

Yojana Mallik (2):
  net: ethernet: ti: Register the RPMsg driver as network device
  net: ethernet: ti: icve: Add support for multicast filtering

 drivers/net/ethernet/ti/Kconfig               |   9 +
 drivers/net/ethernet/ti/Makefile              |   1 +
 drivers/net/ethernet/ti/icve_rpmsg_common.h   | 137 ++++
 drivers/net/ethernet/ti/inter_core_virt_eth.c | 591 ++++++++++++++++++
 drivers/net/ethernet/ti/inter_core_virt_eth.h |  62 ++
 5 files changed, 800 insertions(+)
 create mode 100644 drivers/net/ethernet/ti/icve_rpmsg_common.h
 create mode 100644 drivers/net/ethernet/ti/inter_core_virt_eth.c
 create mode 100644 drivers/net/ethernet/ti/inter_core_virt_eth.h

-- 
2.40.1