Subject: [PATCH net-next 1/3] net: Add extack argument to rtnl_create_link

From: David Ahern <[email-masked]>
Date: Tue, 6 Nov 2018 12:51:14 -0800

From: David Ahern <[email-masked]>

Add extack arg to rtnl_create_link and add messages for invalid
number of Tx or Rx queues.

Signed-off-by: David Ahern <[email-masked]>
---
 drivers/net/can/vxcan.c |  2 +-
 drivers/net/geneve.c    |  2 +-
 drivers/net/veth.c      |  2 +-
 drivers/net/vxlan.c     |  2 +-
 include/net/rtnetlink.h |  3 ++-
 net/core/rtnetlink.c    | 18 ++++++++++++------
 net/ipv4/ip_gre.c       |  2 +-
 7 files changed, 19 insertions(+), 12 deletions(-)

diff --git a/drivers/net/can/vxcan.c b/drivers/net/can/vxcan.c
index ed6828821fbd..80af658e530d 100644
--- a/drivers/net/can/vxcan.c
+++ b/drivers/net/can/vxcan.c
@@ -207,7 +207,7 @@ static int vxcan_newlink(struct net *net, struct net_device *dev,
 		return PTR_ERR(peer_net);
 
 	peer = rtnl_create_link(peer_net, ifname, name_assign_type,
-				&vxcan_link_ops, tbp);
+				&vxcan_link_ops, tbp, extack);
 	if (IS_ERR(peer)) {
 		put_net(peer_net);
 		return PTR_ERR(peer);
diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index a0cd1c41cf5f..fbfc13d81f66 100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -1666,7 +1666,7 @@ struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
 
 	memset(tb, 0, sizeof(tb));
 	dev = rtnl_create_link(net, name, name_assign_type,
-			       &geneve_link_ops, tb);
+			       &geneve_link_ops, tb, NULL);
 	if (IS_ERR(dev))
 		return dev;
 
diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 890fa5b905e2..f412ea1cef18 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -1253,7 +1253,7 @@ static int veth_newlink(struct net *src_net, struct net_device *dev,
 		return PTR_ERR(net);
 
 	peer = rtnl_create_link(net, ifname, name_assign_type,
-				&veth_link_ops, tbp);
+				&veth_link_ops, tbp, extack);
 	if (IS_ERR(peer)) {
 		put_net(net);
 		return PTR_ERR(peer);
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 297cdeaef479..ae969f806d56 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -3749,7 +3749,7 @@ struct net_device *vxlan_dev_create(struct net *net, const char *name,
 	memset(&tb, 0, sizeof(tb));
 
 	dev = rtnl_create_link(net, name, name_assign_type,
-			       &vxlan_link_ops, tb);
+			       &vxlan_link_ops, tb, NULL);
 	if (IS_ERR(dev))
 		return dev;
 
diff --git a/include/net/rtnetlink.h b/include/net/rtnetlink.h
index cf26e5aacac4..e2091bb2b3a8 100644
--- a/include/net/rtnetlink.h
+++ b/include/net/rtnetlink.h
@@ -159,7 +159,8 @@ struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]);
 struct net_device *rtnl_create_link(struct net *net, const char *ifname,
 				    unsigned char name_assign_type,
 				    const struct rtnl_link_ops *ops,
-				    struct nlattr *tb[]);
+				    struct nlattr *tb[],
+				    struct netlink_ext_ack *extack);
 int rtnl_delete_link(struct net_device *dev);
 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm);
 
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 33d9227a8b80..f787b7640d49 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2885,9 +2885,11 @@ int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
 }
 EXPORT_SYMBOL(rtnl_configure_link);
 
-struct net_device *rtnl_create_link(struct net *net,
-	const char *ifname, unsigned char name_assign_type,
-	const struct rtnl_link_ops *ops, struct nlattr *tb[])
+struct net_device *rtnl_create_link(struct net *net, const char *ifname,
+				    unsigned char name_assign_type,
+				    const struct rtnl_link_ops *ops,
+				    struct nlattr *tb[],
+				    struct netlink_ext_ack *extack)
 {
 	struct net_device *dev;
 	unsigned int num_tx_queues = 1;
@@ -2903,11 +2905,15 @@ struct net_device *rtnl_create_link(struct net *net,
 	else if (ops->get_num_rx_queues)
 		num_rx_queues = ops->get_num_rx_queues();
 
-	if (num_tx_queues < 1 || num_tx_queues > 4096)
+	if (num_tx_queues < 1 || num_tx_queues > 4096) {
+		NL_SET_ERR_MSG(extack, "Invalid number of transmit queues");
 		return ERR_PTR(-EINVAL);
+	}
 
-	if (num_rx_queues < 1 || num_rx_queues > 4096)
+	if (num_rx_queues < 1 || num_rx_queues > 4096) {
+		NL_SET_ERR_MSG(extack, "Invalid number of receive queues");
 		return ERR_PTR(-EINVAL);
+	}
 
 	dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
 			       ops->setup, num_tx_queues, num_rx_queues);
@@ -3163,7 +3169,7 @@ static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
 		}
 
 		dev = rtnl_create_link(link_net ? : dest_net, ifname,
-				       name_assign_type, ops, tb);
+				       name_assign_type, ops, tb, extack);
 		if (IS_ERR(dev)) {
 			err = PTR_ERR(dev);
 			goto out;
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 38befe829caf..2c67af644e64 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -1601,7 +1601,7 @@ struct net_device *gretap_fb_dev_create(struct net *net, const char *name,
 	memset(&tb, 0, sizeof(tb));
 
 	dev = rtnl_create_link(net, name, name_assign_type,
-			       &ipgre_tap_ops, tb);
+			       &ipgre_tap_ops, tb, NULL);
 	if (IS_ERR(dev))
 		return dev;
 
-- 
2.11.0