[PATCH rdma-next 01/13] RDMA/core: Pass the net namespace to the device name lookups

[Jiri Pirko <jiri@resnulli.us>]

From: Jiri Pirko <jiri@nvidia.com>

Prepare for per-netns RDMA device names by passing the target net
namespace through the name lookup and allocation helpers. Keep current
global uniqueness behaviour.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
---
 drivers/infiniband/core/device.c | 26 ++++++++++++++++++--------
 1 file changed, 18 insertions(+), 8 deletions(-)

diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index b8193e077a74..de610f52c9b2 100644
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -351,7 +351,8 @@ void ib_device_put(struct ib_device *device)
 }
 EXPORT_SYMBOL(ib_device_put);
 
-static struct ib_device *__ib_device_get_by_name(const char *name)
+static struct ib_device *__ib_device_get_by_name(const char *name,
+						 const struct net *net)
 {
 	struct ib_device *device;
 	unsigned long index;
@@ -395,7 +396,7 @@ int ib_device_rename(struct ib_device *ibdev, const char *name)
 		return 0;
 	}
 
-	if (__ib_device_get_by_name(name)) {
+	if (__ib_device_get_by_name(name, rdma_dev_net(ibdev))) {
 		up_write(&devices_rwsem);
 		return -EEXIST;
 	}
@@ -435,7 +436,8 @@ int ib_device_set_dim(struct ib_device *ibdev, u8 use_dim)
 	return 0;
 }
 
-static int alloc_name(struct ib_device *ibdev, const char *name)
+/* Pick a free index for the '%d' style @name pattern. */
+static int alloc_name_id(struct net *net, const char *name)
 {
 	struct ib_device *device;
 	unsigned long index;
@@ -462,15 +464,22 @@ static int alloc_name(struct ib_device *ibdev, const char *name)
 	}
 
 	rc = ida_alloc(&inuse, GFP_KERNEL);
-	if (rc < 0)
-		goto out;
-
-	rc = dev_set_name(&ibdev->dev, name, rc);
 out:
 	ida_destroy(&inuse);
 	return rc;
 }
 
+static int alloc_name(struct ib_device *ibdev, const char *name)
+{
+	int id;
+
+	id = alloc_name_id(rdma_dev_net(ibdev), name);
+	if (id < 0)
+		return id;
+
+	return dev_set_name(&ibdev->dev, name, id);
+}
+
 static void ib_device_release(struct device *device)
 {
 	struct ib_device *dev = container_of(device, struct ib_device, dev);
@@ -1223,7 +1232,8 @@ static int assign_name(struct ib_device *device, const char *name)
 	if (ret)
 		goto out;
 
-	if (__ib_device_get_by_name(dev_name(&device->dev))) {
+	if (__ib_device_get_by_name(dev_name(&device->dev),
+				    rdma_dev_net(device))) {
 		ret = -ENFILE;
 		goto out;
 	}
-- 
2.54.0