linux-kernel - Re: [RFC PATCH net-next 1/2] net: ethernet: ti: Introduce inter-core-virt-eth as RPMsg driver

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Date: Thu, 1 Feb 2024 14:30:01 +0100
From: Simon Horman <horms@...nel.org>
To: Ravi Gunasekaran <r-gunasekaran@...com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, andrew@...n.ch, rogerq@...nel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	s-vadapalli@...com, srk@...com
Subject: Re: [RFC PATCH net-next 1/2] net: ethernet: ti: Introduce
 inter-core-virt-eth as RPMsg driver

On Tue, Jan 30, 2024 at 04:39:43PM +0530, Ravi Gunasekaran wrote:
> TI's K3 SoCs comprises heterogeneous processors (Cortex A, Cortex R).
> When the ethernet controller is completely managed by a core (Cortex R)
> running a flavor of RTOS, in a non virtualized environment, network traffic
> tunnelling between heterogeneous processors can be realized by means of
> RPMsg based shared memory ethernet driver. With the shared memory used
> for the data plane and the RPMsg end point channel used for control plane.
> 
> inter-core-virt-eth driver is modelled as a RPMsg based shared
> memory ethernet driver for such an use case.
> 
> As a first step, register the inter-core-virt-eth as a RPMsg driver.
> And introduce basic control messages for querying and responding.
> 
> Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
> Signed-off-by: Ravi Gunasekaran <r-gunasekaran@...com>
> ---
>  drivers/net/ethernet/ti/inter-core-virt-eth.c | 139 ++++++++++++++++++
>  drivers/net/ethernet/ti/inter-core-virt-eth.h |  89 +++++++++++
>  2 files changed, 228 insertions(+)
>  create mode 100644 drivers/net/ethernet/ti/inter-core-virt-eth.c
>  create mode 100644 drivers/net/ethernet/ti/inter-core-virt-eth.h
> 
> diff --git a/drivers/net/ethernet/ti/inter-core-virt-eth.c b/drivers/net/ethernet/ti/inter-core-virt-eth.c
> new file mode 100644
> index 000000000000..d3b689eab1c0
> --- /dev/null
> +++ b/drivers/net/ethernet/ti/inter-core-virt-eth.c
> @@ -0,0 +1,139 @@
> +/* SPDX-License-Identifier: GPL-2.0 */

Hi Ravi and Siddharth,

The correct style for SPDX headers in .c files is a '//' comment:

// SPDX-License-Identifier: GPL-2.0

> +/* Texas Instruments K3 Inter Core Virtual Ethernet Driver
> + *
> + * Copyright (C) 2024 Texas Instruments Incorporated - https://www.ti.com/
> + */

..

> diff --git a/drivers/net/ethernet/ti/inter-core-virt-eth.h b/drivers/net/ethernet/ti/inter-core-virt-eth.h

..

> +struct icve_common {
> +	struct rpmsg_device *rpdev;
> +	spinlock_t send_msg_lock;
> +	spinlock_t recv_msg_lock;

Spinlocks ought to come with an comment regarding what they lock.

> +	struct message send_msg;
> +	struct message recv_msg;
> +	struct icve_port *port;
> +	struct device *dev;
> +} __packed;
> +
> +#endif /* __INTER_CORE_VIRT_ETH_H__ */
> -- 
> 2.17.1
> 
>