[PATCH rdma-next v2 04/14] RDMA/nldev: Report net namespace move errors through extack

[Jiri Pirko <jiri@resnulli.us>]

From: Jiri Pirko <jiri@nvidia.com>

Thread extack through the existing net namespace move helper and report the
main failure reasons from the core path. Keep the existing move UAPI shape
unchanged.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
---
 drivers/infiniband/core/core_priv.h |  3 ++-
 drivers/infiniband/core/device.c    | 24 ++++++++++++++++++++++--
 drivers/infiniband/core/nldev.c     |  6 ++----
 3 files changed, 26 insertions(+), 7 deletions(-)

diff --git a/drivers/infiniband/core/core_priv.h b/drivers/infiniband/core/core_priv.h
index 3bd5bb7135a3..aaf330b0d333 100644
--- a/drivers/infiniband/core/core_priv.h
+++ b/drivers/infiniband/core/core_priv.h
@@ -356,7 +356,8 @@ void ib_port_unregister_client_groups(struct ib_device *ibdev, u32 port_num,
 				     const struct attribute_group **groups);
 
 int ib_device_set_netns_put(struct sk_buff *skb,
-			    struct ib_device *dev, u32 ns_fd, const char *name);
+			    struct ib_device *dev, u32 ns_fd, const char *name,
+			    struct netlink_ext_ack *extack);
 
 int rdma_nl_net_init(struct rdma_dev_net *rnet);
 void rdma_nl_net_exit(struct rdma_dev_net *rnet);
diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index c0b6613dba4c..366bd8463c07 100644
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -1871,18 +1871,22 @@ static int rdma_dev_change_netns(struct ib_device *device, struct net *cur_net,
 }
 
 int ib_device_set_netns_put(struct sk_buff *skb,
-			    struct ib_device *dev, u32 ns_fd, const char *name)
+			    struct ib_device *dev, u32 ns_fd, const char *name,
+			    struct netlink_ext_ack *extack)
 {
 	struct net *net;
 	int ret;
 
 	net = get_net_ns_by_fd(ns_fd);
 	if (IS_ERR(net)) {
+		NL_SET_ERR_MSG(extack, "Invalid target net namespace fd");
 		ret = PTR_ERR(net);
 		goto net_err;
 	}
 
 	if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) {
+		NL_SET_ERR_MSG(extack,
+			       "Missing CAP_NET_ADMIN in the target net namespace");
 		ret = -EPERM;
 		goto ns_err;
 	}
@@ -1893,6 +1897,10 @@ int ib_device_set_netns_put(struct sk_buff *skb,
 	 */
 	if (net_eq(net, read_pnet(&dev->coredev.rdma_net))) {
 		ret = name ? ib_device_rename(dev, name) : 0;
+
+		if (ret == -EEXIST)
+			NL_SET_ERR_MSG(extack,
+				       "Device name already exists in the target net namespace");
 		goto ns_err;
 	}
 
@@ -1901,7 +1909,16 @@ int ib_device_set_netns_put(struct sk_buff *skb,
 	 * changed and this cannot be blocked waiting for userspace to do
 	 * something, so disassociation is mandatory.
 	 */
-	if (!dev->ops.disassociate_ucontext || ib_devices_shared_netns) {
+	if (ib_devices_shared_netns) {
+		NL_SET_ERR_MSG(extack,
+			       "Cannot change net namespace of RDMA device in shared netns mode");
+		ret = -EOPNOTSUPP;
+		goto ns_err;
+	}
+
+	if (!dev->ops.disassociate_ucontext) {
+		NL_SET_ERR_MSG(extack,
+			       "Device does not support namespace changes (no disassociate support)");
 		ret = -EOPNOTSUPP;
 		goto ns_err;
 	}
@@ -1911,6 +1928,9 @@ int ib_device_set_netns_put(struct sk_buff *skb,
 	ret = rdma_dev_change_netns(dev, current->nsproxy->net_ns, net, name,
 				    NULL);
 	put_device(&dev->dev);
+	if (ret == -EEXIST)
+		NL_SET_ERR_MSG(extack,
+			       "Device name already exists in the target net namespace");
 
 	put_net(net);
 	return ret;
diff --git a/drivers/infiniband/core/nldev.c b/drivers/infiniband/core/nldev.c
index 77a758080148..8648e95700bf 100644
--- a/drivers/infiniband/core/nldev.c
+++ b/drivers/infiniband/core/nldev.c
@@ -1195,10 +1195,8 @@ static int nldev_set_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
 		u32 ns_fd;
 
 		ns_fd = nla_get_u32(tb[RDMA_NLDEV_NET_NS_FD]);
-		err = ib_device_set_netns_put(skb, device, ns_fd, NULL);
-		if (err == -EEXIST)
-			NL_SET_ERR_MSG(extack,
-				       "Device name already exists in the target net namespace");
+		err = ib_device_set_netns_put(skb, device, ns_fd, NULL,
+					      extack);
 		goto put_done;
 	}
 
-- 
2.54.0