From nobody Fri Oct 3 11:22:52 2025 Received: from lelvem-ot01.ext.ti.com (lelvem-ot01.ext.ti.com [198.47.23.234]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1CD042E8E03; Tue, 2 Sep 2025 09:08:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.47.23.234 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756804125; cv=none; b=IvU6H/rsi0nASdXeuLya72vUnrcRKAJcMATA4bWMHvm+BIRSihRA/hO9pREBvOEIIgbB9EPNisqqcO3DDWO/szto4PGGoOfiKsfSsw0nHJzkZM02gHp7JOo5047XSRvToIRhZktlukT2rDpGuPJN+LjUcKhkujlbn+G8z0b3GTw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756804125; c=relaxed/simple; bh=L32ueh0XADckKjFdnziQRCVDbzdbHyEd1Bg3gmIq2Xs=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=FFO9TIDAkXpKrulrTkgwL2c58fRVZvk5dztRYVe8U5ff9dAphXAuZdX5/xy218xiRhXv5SyrJ0hwsIZwY0hHiR9ErMtHQM1Sr/aV5Cg4a6UdFQbAxGm1P51Hm1vdP42q8Vnzwrpj+scJte/Dy5gogmQ+T+XYG2bPxYKLlVYWZNs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=ti.com; spf=pass smtp.mailfrom=ti.com; dkim=pass (1024-bit key) header.d=ti.com header.i=@ti.com header.b=BBGTNxID; arc=none smtp.client-ip=198.47.23.234 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=ti.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ti.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ti.com header.i=@ti.com header.b="BBGTNxID" Received: from lelvem-sh02.itg.ti.com ([10.180.78.226]) by lelvem-ot01.ext.ti.com (8.15.2/8.15.2) with ESMTP id 582980L82552643; Tue, 2 Sep 2025 04:08:00 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1756804080; bh=4ryukQeXWfZ0mSaQUezXsdNS7XrtPu+psta+XTg34wI=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=BBGTNxIDd7Zm/tf6tV3x+Ed7utNrmhz0NvqaPOKsC+MzCmxcCNlrSOnsO3r98Wuy0 xRKighHa9UEcSTSr8cPkhIS4RVxMNdshyk0WJ8oxH/WFnSmEvvDTYBAmOCXZdQvx69 2b3lnDZ/VUR/bn6vPgfcllje487MNqzn1Auh3Byo= Received: from DLEE105.ent.ti.com (dlee105.ent.ti.com [157.170.170.35]) by lelvem-sh02.itg.ti.com (8.18.1/8.18.1) with ESMTPS id 582980472729565 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA256 bits=128 verify=FAIL); Tue, 2 Sep 2025 04:08:00 -0500 Received: from DLEE112.ent.ti.com (157.170.170.23) by DLEE105.ent.ti.com (157.170.170.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.55; Tue, 2 Sep 2025 04:07:59 -0500 Received: from lelvem-mr06.itg.ti.com (10.180.75.8) by DLEE112.ent.ti.com (157.170.170.23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.55 via Frontend Transport; Tue, 2 Sep 2025 04:07:59 -0500 Received: from lelv0854.itg.ti.com (lelv0854.itg.ti.com [10.181.64.140]) by lelvem-mr06.itg.ti.com (8.18.1/8.18.1) with ESMTP id 58297xGr3546586; Tue, 2 Sep 2025 04:07:59 -0500 Received: from localhost (danish-tpc.dhcp.ti.com [172.24.231.152]) by lelv0854.itg.ti.com (8.14.7/8.14.7) with ESMTP id 58297wtc020837; Tue, 2 Sep 2025 04:07:58 -0500 From: MD Danish Anwar To: Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bjorn Andersson , Mathieu Poirier , Simon Horman , Jonathan Corbet , Nishanth Menon , Vignesh Raghavendra , Mengyuan Lou , MD Danish Anwar , Xin Guo , Lei Wei , Lee Trager , Michael Ellerman , Fan Gong , Lorenzo Bianconi , Geert Uytterhoeven , Lukas Bulwahn , Parthiban Veerasooran , Suman Anna CC: Tero Kristo , , , , , , , , Roger Quadros Subject: [PATCH net-next v2 4/8] net: rpmsg-eth: Add basic rpmsg skeleton Date: Tue, 2 Sep 2025 14:37:42 +0530 Message-ID: <20250902090746.3221225-5-danishanwar@ti.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250902090746.3221225-1-danishanwar@ti.com> References: <20250902090746.3221225-1-danishanwar@ti.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-C2ProcessedOrg: 333ef613-75bf-4e12-a4b1-8e3623f5dcea Content-Type: text/plain; charset="utf-8" Introduces a basic RPMSG Ethernet driver and add it's basic skeleton. Add support for creating virtual Ethernet devices over RPMSG channels, allowing user-space programs to send and receive messages using a standard Ethernet protocol. The driver includes message handling, probe, and remove functions, along with necessary data structures. Signed-off-by: MD Danish Anwar --- drivers/net/ethernet/Kconfig | 10 +++ drivers/net/ethernet/Makefile | 1 + drivers/net/ethernet/rpmsg_eth.c | 142 +++++++++++++++++++++++++++++++ drivers/net/ethernet/rpmsg_eth.h | 75 ++++++++++++++++ 4 files changed, 228 insertions(+) create mode 100644 drivers/net/ethernet/rpmsg_eth.c create mode 100644 drivers/net/ethernet/rpmsg_eth.h diff --git a/drivers/net/ethernet/Kconfig b/drivers/net/ethernet/Kconfig index f86d4557d8d7..a73a45a9ef3d 100644 --- a/drivers/net/ethernet/Kconfig +++ b/drivers/net/ethernet/Kconfig @@ -170,6 +170,16 @@ config OA_TC6 To know the implementation details, refer documentation in . =20 +config RPMSG_ETH + tristate "RPMsg Based Virtual Ethernet driver" + depends on RPMSG + help + This makes it possible for user-space programs to send and receive + rpmsg messages as a standard eth protocol. + + To compile this driver as a module, choose M here: the module will be + called rpmsg_eth. + source "drivers/net/ethernet/packetengines/Kconfig" source "drivers/net/ethernet/pasemi/Kconfig" source "drivers/net/ethernet/pensando/Kconfig" diff --git a/drivers/net/ethernet/Makefile b/drivers/net/ethernet/Makefile index 67182339469a..aebd15993e3c 100644 --- a/drivers/net/ethernet/Makefile +++ b/drivers/net/ethernet/Makefile @@ -107,3 +107,4 @@ obj-$(CONFIG_NET_VENDOR_XIRCOM) +=3D xircom/ obj-$(CONFIG_NET_VENDOR_SYNOPSYS) +=3D synopsys/ obj-$(CONFIG_NET_VENDOR_PENSANDO) +=3D pensando/ obj-$(CONFIG_OA_TC6) +=3D oa_tc6.o +obj-$(CONFIG_RPMSG_ETH) +=3D rpmsg_eth.o diff --git a/drivers/net/ethernet/rpmsg_eth.c b/drivers/net/ethernet/rpmsg_= eth.c new file mode 100644 index 000000000000..4cfd9ff2f142 --- /dev/null +++ b/drivers/net/ethernet/rpmsg_eth.c @@ -0,0 +1,142 @@ +// SPDX-License-Identifier: GPL-2.0 +/* RPMsg Based Virtual Ethernet Driver + * + * Copyright (C) 2025 Texas Instruments Incorporated - https://www.ti.com/ + */ + +#include +#include +#include +#include "rpmsg_eth.h" + +static int rpmsg_eth_rpmsg_cb(struct rpmsg_device *rpdev, void *data, int = len, + void *priv, u32 src) +{ + struct rpmsg_eth_common *common =3D dev_get_drvdata(&rpdev->dev); + struct message *msg =3D (struct message *)data; + u32 msg_type =3D msg->msg_hdr.msg_type; + int ret =3D 0; + + switch (msg_type) { + case RPMSG_ETH_REQUEST_MSG: + case RPMSG_ETH_RESPONSE_MSG: + case RPMSG_ETH_NOTIFY_MSG: + dev_dbg(common->dev, "Msg type =3D %d, Src Id =3D %d\n", + msg_type, msg->msg_hdr.src_id); + break; + default: + dev_err(common->dev, "Invalid msg type\n"); + ret =3D -EINVAL; + break; + } + return ret; +} + +/** + * rpmsg_eth_get_shm_info - Retrieve shared memory region for RPMsg Ethern= et + * @common: Pointer to rpmsg_eth_common structure + * + * This function locates and maps the reserved memory region for the RPMsg + * Ethernet device by traversing the device tree hierarchy. It first ident= ifies + * the associated remote processor (rproc), then locates the "rpmsg-eth" c= hild + * node within the rproc's device tree node, and finally retrieves the + * "memory-region" phandle that points to the reserved memory region. + * Once found, the shared memory region is mapped into the + * kernel's virtual address space using devm_ioremap() + * + * Return: 0 on success, negative error code on failure. + */ +static int rpmsg_eth_get_shm_info(struct rpmsg_eth_common *common) +{ + struct device_node *np, *rpmsg_eth_node, *rmem_np; + struct reserved_mem *rmem; + struct rproc *rproc; + + /* Get the remote processor associated with this device */ + rproc =3D rproc_get_by_child(&common->rpdev->dev); + if (!rproc) { + dev_err(common->dev, "rpmsg eth device not child of rproc\n"); + return -EINVAL; + } + + /* Get the device node from rproc or its parent */ + np =3D rproc->dev.of_node ?: (rproc->dev.parent ? rproc->dev.parent->of_n= ode : NULL); + if (!np) { + dev_err(common->dev, "Cannot find rproc device node\n"); + return -ENODEV; + } + + /* Get the rpmsg-eth child node */ + rpmsg_eth_node =3D of_get_child_by_name(np, "rpmsg-eth"); + if (!rpmsg_eth_node) { + dev_err(common->dev, "Couldn't get rpmsg-eth node from np\n"); + return -ENODEV; + } + + /* Parse the memory-region phandle */ + rmem_np =3D of_parse_phandle(rpmsg_eth_node, "memory-region", 0); + of_node_put(rpmsg_eth_node); + if (!rmem_np) + return -EINVAL; + + /* Lookup the reserved memory region */ + rmem =3D of_reserved_mem_lookup(rmem_np); + of_node_put(rmem_np); + if (!rmem) + return -EINVAL; + + common->port->shm =3D devm_ioremap(common->dev, rmem->base, rmem->size); + if (IS_ERR(common->port->shm)) + return PTR_ERR(common->port->shm); + + common->port->buf_size =3D rmem->size; + + return 0; +} + +static int rpmsg_eth_probe(struct rpmsg_device *rpdev) +{ + struct device *dev =3D &rpdev->dev; + struct rpmsg_eth_common *common; + int ret =3D 0; + + common =3D devm_kzalloc(&rpdev->dev, sizeof(*common), GFP_KERNEL); + if (!common) + return -ENOMEM; + + dev_set_drvdata(dev, common); + + common->port =3D devm_kzalloc(dev, sizeof(*common->port), GFP_KERNEL); + common->dev =3D dev; + common->rpdev =3D rpdev; + + ret =3D rpmsg_eth_get_shm_info(common); + if (ret) + return ret; + + return 0; +} + +static void rpmsg_eth_remove(struct rpmsg_device *rpdev) +{ + dev_dbg(&rpdev->dev, "rpmsg-eth client driver is removed\n"); +} + +static struct rpmsg_device_id rpmsg_eth_rpmsg_id_table[] =3D { + { .name =3D "shm-eth" }, + {}, +}; +MODULE_DEVICE_TABLE(rpmsg, rpmsg_eth_rpmsg_id_table); + +static struct rpmsg_driver rpmsg_eth_rpmsg_client =3D { + .drv.name =3D KBUILD_MODNAME, + .id_table =3D rpmsg_eth_rpmsg_id_table, + .probe =3D rpmsg_eth_probe, + .callback =3D rpmsg_eth_rpmsg_cb, + .remove =3D rpmsg_eth_remove, +}; +module_rpmsg_driver(rpmsg_eth_rpmsg_client); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("MD Danish Anwar "); +MODULE_DESCRIPTION("RPMsg Based Virtual Ethernet driver"); diff --git a/drivers/net/ethernet/rpmsg_eth.h b/drivers/net/ethernet/rpmsg_= eth.h new file mode 100644 index 000000000000..12be1c35eff8 --- /dev/null +++ b/drivers/net/ethernet/rpmsg_eth.h @@ -0,0 +1,75 @@ +/* SPDX-License-Identifier: GPL-2.0 + * RPMsg Based Virtual Ethernet Driver common header + * + * Copyright (C) 2025 Texas Instruments Incorporated - https://www.ti.com/ + */ + +#ifndef __RPMSG_ETH_H__ +#define __RPMSG_ETH_H__ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define RPMSG_ETH_SHM_MAGIC_NUM 0xABCDABCD + +enum rpmsg_eth_msg_type { + RPMSG_ETH_REQUEST_MSG =3D 0, + RPMSG_ETH_RESPONSE_MSG, + RPMSG_ETH_NOTIFY_MSG, +}; + +/** + * struct message_header - message header structure for RPMSG Ethernet + * @src_id: Source endpoint ID + * @msg_type: Message type + */ +struct message_header { + u32 src_id; + u32 msg_type; +} __packed; + +/** + * struct message - RPMSG Ethernet message structure + * + * @msg_hdr: Message header contains source and destination endpoint and + * the type of message + * + * This structure is used to send and receive messages between the RPMSG + * Ethernet ports. + */ +struct message { + struct message_header msg_hdr; +} __packed; + +/** + * struct rpmsg_eth_common - common structure for RPMSG Ethernet + * @rpdev: RPMSG device + * @port: Ethernet port + * @dev: Device + */ +struct rpmsg_eth_common { + struct rpmsg_device *rpdev; + struct rpmsg_eth_port *port; + struct device *dev; +}; + +/** + * struct rpmsg_eth_port - Ethernet port structure for RPMSG Ethernet + * @common: Pointer to the common RPMSG Ethernet structure + * @shm: Shared memory region mapping + * @buf_size: Size (in bytes) of the shared memory buffer for this port + */ +struct rpmsg_eth_port { + struct rpmsg_eth_common *common; + void __iomem *shm; + phys_addr_t buf_size; +}; + +#endif /* __RPMSG_ETH_H__ */ --=20 2.34.1