(resend with proper To:)
> Wrap VLAN hardware acceleration calls into separate functions. This way
> other code can re-use it.
Maybe instead of jumping aroung bugs that are easily fixed just don't
let them in? See untested patch below. Affected drivers can be either
fixed or have NETIF_F_HW_VLAN_FILTER removed from advertised features.
--cut-here--
net: disallow drivers with buggy VLAN accel to register_netdevice()
Signed-off-by: Michał Mirosław <mirq-linux@xxxxxxxxxxxx>
---
net/8021q/vlan.c | 7 -------
net/8021q/vlan_core.c | 6 ++----
net/core/dev.c | 9 +++++++++
3 files changed, 11 insertions(+), 11 deletions(-)
diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index babfde9..addc578 100644
--- 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
--- 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 b6d2b32..f87cdc2 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6211,6 +6211,15 @@ int register_netdevice(struct net_device *dev)
}
}
+ if (((dev->hw_features & NETIF_F_HW_VLAN_FILTER) ||
+ (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);
--
1.7.10.4
----- End forwarded message -----
