net/qrtr/smd.c

Source file repositories/reference/linux-study-clean/net/qrtr/smd.c

File Facts

System
Linux kernel
Corpus path
net/qrtr/smd.c
Extension
.c
Size
2335 bytes
Lines
112
Domain
Networking Core
Bucket
Sockets, Protocols, Packet Path, And Network Policy
Inferred role
Networking Core: implementation source
Status
source implementation candidate

Why This File Exists

Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.

Dependency Surface

Detected Declarations

Annotated Snippet

struct qrtr_smd_dev {
	struct qrtr_endpoint ep;
	struct rpmsg_endpoint *channel;
	struct device *dev;
};

/* from smd to qrtr */
static int qcom_smd_qrtr_callback(struct rpmsg_device *rpdev,
				  void *data, int len, void *priv, u32 addr)
{
	struct qrtr_smd_dev *qdev = dev_get_drvdata(&rpdev->dev);
	int rc;

	if (!qdev)
		return -EAGAIN;

	rc = qrtr_endpoint_post(&qdev->ep, data, len);
	if (rc == -EINVAL) {
		dev_err(qdev->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 = rpmsg_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 rpmsg_device *rpdev)
{
	struct qrtr_smd_dev *qdev;
	int rc;

	qdev = devm_kzalloc(&rpdev->dev, sizeof(*qdev), GFP_KERNEL);
	if (!qdev)
		return -ENOMEM;

	qdev->channel = rpdev->ept;
	qdev->dev = &rpdev->dev;
	qdev->ep.xmit = qcom_smd_qrtr_send;

	rc = qrtr_endpoint_register(&qdev->ep, QRTR_EP_NID_AUTO);
	if (rc)
		return rc;

	dev_set_drvdata(&rpdev->dev, qdev);

	dev_dbg(&rpdev->dev, "Qualcomm SMD QRTR driver probed\n");

	return 0;
}

static void qcom_smd_qrtr_remove(struct rpmsg_device *rpdev)
{
	struct qrtr_smd_dev *qdev = dev_get_drvdata(&rpdev->dev);

	qrtr_endpoint_unregister(&qdev->ep);

	dev_set_drvdata(&rpdev->dev, NULL);
}

static const struct rpmsg_device_id qcom_smd_qrtr_smd_match[] = {
	{ "IPCRTR" },
	{}
};

static struct rpmsg_driver qcom_smd_qrtr_driver = {
	.probe = qcom_smd_qrtr_probe,
	.remove = qcom_smd_qrtr_remove,
	.callback = qcom_smd_qrtr_callback,
	.id_table = qcom_smd_qrtr_smd_match,
	.drv = {

Annotation

Implementation Notes