net: Add Qualcomm IPC router

Add an implementation of Qualcomm's IPC router protocol, used to
communicate with service providing remote processors.

Signed-off-by: Courtney Cavin <courtney.cavin@sonymobile.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
[bjorn: Cope with 0 being a valid node id and implement RTM_NEWADDR]
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Courtney Cavin 2016-05-06 07:09:08 -07:00 committed by David S. Miller
parent 43315f31ad
commit bdabad3e36
9 changed files with 1198 additions and 1 deletions

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@ -201,8 +201,9 @@ struct ucred {
#define AF_NFC 39 /* NFC sockets */
#define AF_VSOCK 40 /* vSockets */
#define AF_KCM 41 /* Kernel Connection Multiplexor*/
#define AF_QIPCRTR 42 /* Qualcomm IPC Router */
#define AF_MAX 42 /* For now.. */
#define AF_MAX 43 /* For now.. */
/* Protocol families, same as address families. */
#define PF_UNSPEC AF_UNSPEC
@ -249,6 +250,7 @@ struct ucred {
#define PF_NFC AF_NFC
#define PF_VSOCK AF_VSOCK
#define PF_KCM AF_KCM
#define PF_QIPCRTR AF_QIPCRTR
#define PF_MAX AF_MAX
/* Maximum queue length specifiable by listen. */

12
include/uapi/linux/qrtr.h Normal file
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@ -0,0 +1,12 @@
#ifndef _LINUX_QRTR_H
#define _LINUX_QRTR_H
#include <linux/socket.h>
struct sockaddr_qrtr {
__kernel_sa_family_t sq_family;
__u32 sq_node;
__u32 sq_port;
};
#endif /* _LINUX_QRTR_H */

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@ -236,6 +236,7 @@ source "net/mpls/Kconfig"
source "net/hsr/Kconfig"
source "net/switchdev/Kconfig"
source "net/l3mdev/Kconfig"
source "net/qrtr/Kconfig"
config RPS
bool

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@ -78,3 +78,4 @@ endif
ifneq ($(CONFIG_NET_L3_MASTER_DEV),)
obj-y += l3mdev/
endif
obj-$(CONFIG_QRTR) += qrtr/

24
net/qrtr/Kconfig Normal file
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@ -0,0 +1,24 @@
# Qualcomm IPC Router configuration
#
config QRTR
tristate "Qualcomm IPC Router support"
depends on ARCH_QCOM || COMPILE_TEST
---help---
Say Y if you intend to use Qualcomm IPC router protocol. The
protocol is used to communicate with services provided by other
hardware blocks in the system.
In order to do service lookups, a userspace daemon is required to
maintain a service listing.
if QRTR
config QRTR_SMD
tristate "SMD IPC Router channels"
depends on QCOM_SMD || COMPILE_TEST
---help---
Say Y here to support SMD based ipcrouter channels. SMD is the
most common transport for IPC Router.
endif # QRTR

2
net/qrtr/Makefile Normal file
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@ -0,0 +1,2 @@
obj-$(CONFIG_QRTR) := qrtr.o
obj-$(CONFIG_QRTR_SMD) += smd.o

1007
net/qrtr/qrtr.c Normal file

File diff suppressed because it is too large Load Diff

31
net/qrtr/qrtr.h Normal file
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@ -0,0 +1,31 @@
#ifndef __QRTR_H_
#define __QRTR_H_
#include <linux/types.h>
struct sk_buff;
/* endpoint node id auto assignment */
#define QRTR_EP_NID_AUTO (-1)
/**
* struct qrtr_endpoint - endpoint handle
* @xmit: Callback for outgoing packets
*
* The socket buffer passed to the xmit function becomes owned by the endpoint
* driver. As such, when the driver is done with the buffer, it should
* call kfree_skb() on failure, or consume_skb() on success.
*/
struct qrtr_endpoint {
int (*xmit)(struct qrtr_endpoint *ep, struct sk_buff *skb);
/* private: not for endpoint use */
struct qrtr_node *node;
};
int qrtr_endpoint_register(struct qrtr_endpoint *ep, unsigned int nid);
void qrtr_endpoint_unregister(struct qrtr_endpoint *ep);
int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len);
#endif

117
net/qrtr/smd.c Normal file
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@ -0,0 +1,117 @@
/*
* Copyright (c) 2015, Sony Mobile Communications Inc.
* Copyright (c) 2013, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/soc/qcom/smd.h>
#include "qrtr.h"
struct qrtr_smd_dev {
struct qrtr_endpoint ep;
struct qcom_smd_channel *channel;
};
/* from smd to qrtr */
static int qcom_smd_qrtr_callback(struct qcom_smd_device *sdev,
const void *data, size_t len)
{
struct qrtr_smd_dev *qdev = dev_get_drvdata(&sdev->dev);
int rc;
if (!qdev)
return -EAGAIN;
rc = qrtr_endpoint_post(&qdev->ep, data, len);
if (rc == -EINVAL) {
dev_err(&sdev->dev, "invalid ipcrouter packet\n");
/* return 0 to let smd drop the packet */
rc = 0;
}
return rc;
}
/* from qrtr to smd */
static int qcom_smd_qrtr_send(struct qrtr_endpoint *ep, struct sk_buff *skb)
{
struct qrtr_smd_dev *qdev = container_of(ep, struct qrtr_smd_dev, ep);
int rc;
rc = skb_linearize(skb);
if (rc)
goto out;
rc = qcom_smd_send(qdev->channel, skb->data, skb->len);
out:
if (rc)
kfree_skb(skb);
else
consume_skb(skb);
return rc;
}
static int qcom_smd_qrtr_probe(struct qcom_smd_device *sdev)
{
struct qrtr_smd_dev *qdev;
int rc;
qdev = devm_kzalloc(&sdev->dev, sizeof(*qdev), GFP_KERNEL);
if (!qdev)
return -ENOMEM;
qdev->channel = sdev->channel;
qdev->ep.xmit = qcom_smd_qrtr_send;
rc = qrtr_endpoint_register(&qdev->ep, QRTR_EP_NID_AUTO);
if (rc)
return rc;
dev_set_drvdata(&sdev->dev, qdev);
dev_dbg(&sdev->dev, "Qualcomm SMD QRTR driver probed\n");
return 0;
}
static void qcom_smd_qrtr_remove(struct qcom_smd_device *sdev)
{
struct qrtr_smd_dev *qdev = dev_get_drvdata(&sdev->dev);
qrtr_endpoint_unregister(&qdev->ep);
dev_set_drvdata(&sdev->dev, NULL);
}
static const struct qcom_smd_id qcom_smd_qrtr_smd_match[] = {
{ "IPCRTR" },
{}
};
static struct qcom_smd_driver qcom_smd_qrtr_driver = {
.probe = qcom_smd_qrtr_probe,
.remove = qcom_smd_qrtr_remove,
.callback = qcom_smd_qrtr_callback,
.smd_match_table = qcom_smd_qrtr_smd_match,
.driver = {
.name = "qcom_smd_qrtr",
.owner = THIS_MODULE,
},
};
module_qcom_smd_driver(qcom_smd_qrtr_driver);
MODULE_DESCRIPTION("Qualcomm IPC-Router SMD interface driver");
MODULE_LICENSE("GPL v2");