net: disallow drivers with buggy VLAN accel to register_netdevice()

Instead of jumping aroung bugs that are easily fixed just don't let them in:
affected drivers should be either fixed or have NETIF_F_HW_VLAN_FILTER
removed from advertised features.

Quick grep in drivers/net shows two drivers that have NETIF_F_HW_VLAN_FILTER
but not ndo_vlan_rx_add/kill_vid(), but those are false-positives (features
are commented out).

OTOH two drivers have ndo_vlan_rx_add/kill_vid() implemented but don't
advertise NETIF_F_HW_VLAN_FILTER. Those are:

+ethernet/cisco/enic/enic_main.c
+ethernet/qlogic/qlcnic/qlcnic_main.c

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index babfde9..addc578 100644 (file)
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -117,19 +117,12 @@ void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
 {
        const char *name = real_dev->name;
-       const struct net_device_ops *ops = real_dev->netdev_ops;
 
        if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
                pr_info("VLANs not supported on %s\n", name);
                return -EOPNOTSUPP;
        }
 
-       if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
-           (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
-               pr_info("Device %s has buggy VLAN hw accel\n", name);
-               return -EOPNOTSUPP;
-       }
-
        if (vlan_find_dev(real_dev, vlan_id) != NULL)
                return -EEXIST;
 

diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c
index 380440b..71b64fd 100644 (file)
--- a/net/8021q/vlan_core.c
+++ b/net/8021q/vlan_core.c
@@ -224,8 +224,7 @@ static int __vlan_vid_add(struct vlan_info *vlan_info, unsigned short vid,
        if (!vid_info)
                return -ENOMEM;
 
-       if ((dev->features & NETIF_F_HW_VLAN_FILTER) &&
-           ops->ndo_vlan_rx_add_vid) {
+       if (dev->features & NETIF_F_HW_VLAN_FILTER) {
                err =  ops->ndo_vlan_rx_add_vid(dev, vid);
                if (err) {
                        kfree(vid_info);
@@ -282,8 +281,7 @@ static void __vlan_vid_del(struct vlan_info *vlan_info,
        unsigned short vid = vid_info->vid;
        int err;
 
-       if ((dev->features & NETIF_F_HW_VLAN_FILTER) &&
-            ops->ndo_vlan_rx_kill_vid) {
+       if (dev->features & NETIF_F_HW_VLAN_FILTER) {
                err = ops->ndo_vlan_rx_kill_vid(dev, vid);
                if (err) {
                        pr_warn("failed to kill vid %d for device %s\n",

diff --git a/net/core/dev.c b/net/core/dev.c
index a83375d..a87bc74 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6054,6 +6054,14 @@ int register_netdevice(struct net_device *dev)
                }
        }
 
+       if (((dev->hw_features | dev->features) & NETIF_F_HW_VLAN_FILTER) &&
+           (!dev->netdev_ops->ndo_vlan_rx_add_vid ||
+            !dev->netdev_ops->ndo_vlan_rx_kill_vid)) {
+               netdev_WARN(dev, "Buggy VLAN acceleration in driver!\n");
+               ret = -EINVAL;
+               goto err_uninit;
+       }
+
        ret = -EBUSY;
        if (!dev->ifindex)
                dev->ifindex = dev_new_index(net);