drivers/infiniband/hw/usnic/usnic_debugfs.c

Source file repositories/reference/linux-study-clean/drivers/infiniband/hw/usnic/usnic_debugfs.c

File Facts

System
Linux kernel
Corpus path
drivers/infiniband/hw/usnic/usnic_debugfs.c
Extension
.c
Size
4050 bytes
Lines
143
Domain
Driver Families
Bucket
drivers/infiniband
Inferred role
Driver Families: operation-table or driver-model contract
Status
pattern implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

static const struct file_operations usnic_debugfs_buildinfo_ops = {
	.owner = THIS_MODULE,
	.open = simple_open,
	.read = usnic_debugfs_buildinfo_read
};

static ssize_t flowinfo_read(struct file *f, char __user *data,
				size_t count, loff_t *ppos)
{
	struct usnic_ib_qp_grp_flow *qp_flow;
	int n;
	int left;
	char *ptr;
	char buf[512];

	qp_flow = f->private_data;
	ptr = buf;
	left = count;

	if (*ppos > 0)
		return 0;

	spin_lock(&qp_flow->qp_grp->lock);
	n = scnprintf(ptr, left,
			"QP Grp ID: %d Transport: %s ",
			qp_flow->qp_grp->grp_id,
			usnic_transport_to_str(qp_flow->trans_type));
	UPDATE_PTR_LEFT(n, ptr, left);
	if (qp_flow->trans_type == USNIC_TRANSPORT_ROCE_CUSTOM) {
		n = scnprintf(ptr, left, "Port_Num:%hu\n",
					qp_flow->usnic_roce.port_num);
		UPDATE_PTR_LEFT(n, ptr, left);
	} else if (qp_flow->trans_type == USNIC_TRANSPORT_IPV4_UDP) {
		n = usnic_transport_sock_to_str(ptr, left,
				qp_flow->udp.sock);
		UPDATE_PTR_LEFT(n, ptr, left);
		n = scnprintf(ptr, left, "\n");
		UPDATE_PTR_LEFT(n, ptr, left);
	}
	spin_unlock(&qp_flow->qp_grp->lock);

	return simple_read_from_buffer(data, count, ppos, buf, ptr - buf);
}

static const struct file_operations flowinfo_ops = {
	.owner = THIS_MODULE,
	.open = simple_open,
	.read = flowinfo_read,
};

void usnic_debugfs_init(void)
{
	debugfs_root = debugfs_create_dir(DRV_NAME, NULL);

	flows_dentry = debugfs_create_dir("flows", debugfs_root);

	debugfs_create_file("build-info", S_IRUGO, debugfs_root,
				NULL, &usnic_debugfs_buildinfo_ops);
}

void usnic_debugfs_exit(void)
{
	debugfs_remove_recursive(debugfs_root);
	debugfs_root = NULL;
}

void usnic_debugfs_flow_add(struct usnic_ib_qp_grp_flow *qp_flow)
{
	scnprintf(qp_flow->dentry_name, sizeof(qp_flow->dentry_name),
			"%u", qp_flow->flow->flow_id);
	qp_flow->dbgfs_dentry = debugfs_create_file(qp_flow->dentry_name,
							S_IRUGO,
							flows_dentry,
							qp_flow,
							&flowinfo_ops);
}

void usnic_debugfs_flow_remove(struct usnic_ib_qp_grp_flow *qp_flow)
{
	debugfs_remove(qp_flow->dbgfs_dentry);
}

Annotation

Implementation Notes