commit c5bcbbb9fe00128d500c2f473d5ddc8d8c2c53a7
author Roland Dreier <rolandd@cisco.com> Thu Feb 02 09:47:14 2006 -0800
committer Roland Dreier <rolandd@cisco.com> Mon Mar 20 10:08:09 2006 -0800
tree c4a6feac1bc1dfd9e2fbe88c8e6ad1db4a47a817
parent 2fa5e2ebbe2d81f741ba7bed9e07dc38cc734625

IB: Allow userspace to set node description

Expose a writable "node_desc" sysfs attribute for InfiniBand devices.
This allows userspace to update the node description with information
such as the node's hostname, so that IB network management software
can tie its view to the real world.

Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/core/sysfs.c

diff --git a/drivers/infiniband/core/sysfs.c b/drivers/infiniband/core/sysfs.c
index 5982d68..49601bb 100644
--- a/drivers/infiniband/core/sysfs.c
+++ b/drivers/infiniband/core/sysfs.c
@@ -628,14 +628,42 @@
 		       be16_to_cpu(((__be16 *) &dev->node_guid)[3]));
 }
 
+static ssize_t show_node_desc(struct class_device *cdev, char *buf)
+{
+	struct ib_device *dev = container_of(cdev, struct ib_device, class_dev);
+
+	return sprintf(buf, "%.64s\n", dev->node_desc);
+}
+
+static ssize_t set_node_desc(struct class_device *cdev, const char *buf,
+			      size_t count)
+{
+	struct ib_device *dev = container_of(cdev, struct ib_device, class_dev);
+	struct ib_device_modify desc = {};
+	int ret;
+
+	if (!dev->modify_device)
+		return -EIO;
+
+	memcpy(desc.node_desc, buf, min_t(int, count, 64));
+	ret = ib_modify_device(dev, IB_DEVICE_MODIFY_NODE_DESC, &desc);
+	if (ret)
+		return ret;
+
+	return count;
+}
+
 static CLASS_DEVICE_ATTR(node_type, S_IRUGO, show_node_type, NULL);
 static CLASS_DEVICE_ATTR(sys_image_guid, S_IRUGO, show_sys_image_guid, NULL);
 static CLASS_DEVICE_ATTR(node_guid, S_IRUGO, show_node_guid, NULL);
+static CLASS_DEVICE_ATTR(node_desc, S_IRUGO | S_IWUSR, show_node_desc,
+			 set_node_desc);
 
 static struct class_device_attribute *ib_class_attributes[] = {
 	&class_device_attr_node_type,
 	&class_device_attr_sys_image_guid,
-	&class_device_attr_node_guid
+	&class_device_attr_node_guid,
+	&class_device_attr_node_desc
 };
 
 static struct class ib_class = {

include/rdma/ib_verbs.h

diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 38fa6c0..1d31c8c 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -222,11 +222,13 @@
 };
 
 enum ib_device_modify_flags {
-	IB_DEVICE_MODIFY_SYS_IMAGE_GUID	= 1
+	IB_DEVICE_MODIFY_SYS_IMAGE_GUID	= 1 << 0,
+	IB_DEVICE_MODIFY_NODE_DESC	= 1 << 1
 };
 
 struct ib_device_modify {
 	u64	sys_image_guid;
+	char	node_desc[64];
 };
 
 enum ib_port_modify_flags {
@@ -951,6 +953,7 @@
 	u64			     uverbs_cmd_mask;
 	int			     uverbs_abi_ver;
 
+	char			     node_desc[64];
 	__be64			     node_guid;
 	u8                           node_type;
 	u8                           phys_port_cnt;