net: ethtool: require drivers to set supported_coalesce_params

Now that all in-tree drivers have been updated we can
make the supported_coalesce_params mandatory.

To save debugging time in case some driver was missed
(or is out of tree) add a warning when netdev is registered
with set_coalesce but without supported_coalesce_params.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index be355f3..c1d379b 100644 (file)
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -458,6 +458,8 @@ struct ethtool_ops {
                                         struct ethtool_stats *, u64 *);
 };
 
+int ethtool_check_ops(const struct ethtool_ops *ops);
+
 struct ethtool_rx_flow_rule {
        struct flow_rule        *rule;
        unsigned long           priv[0];

diff --git a/net/core/dev.c b/net/core/dev.c
index d84541c..021e182 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -9283,6 +9283,10 @@ int register_netdevice(struct net_device *dev)
        BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
        BUG_ON(!net);
 
+       ret = ethtool_check_ops(dev->ethtool_ops);
+       if (ret)
+               return ret;
+
        spin_lock_init(&dev->addr_list_lock);
        lockdep_set_class(&dev->addr_list_lock, &dev->addr_list_lock_key);
 

diff --git a/net/ethtool/common.c b/net/ethtool/common.c
index 0b22741..dab047e 100644 (file)
--- a/net/ethtool/common.c
+++ b/net/ethtool/common.c
@@ -289,3 +289,14 @@ out:
        kfree(indir);
        return ret;
 }
+
+int ethtool_check_ops(const struct ethtool_ops *ops)
+{
+       if (WARN_ON(ops->set_coalesce && !ops->supported_coalesce_params))
+               return -EINVAL;
+       /* NOTE: sufficiently insane drivers may swap ethtool_ops at runtime,
+        * the fact that ops are checked at registration time does not
+        * mean the ops attached to a netdev later on are sane.
+        */
+       return 0;
+}

diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index 258840b..3852a58 100644 (file)
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -1519,9 +1519,6 @@ ethtool_set_coalesce_supported(struct net_device *dev,
        u32 supported_params = dev->ethtool_ops->supported_coalesce_params;
        u32 nonzero_params = 0;
 
-       if (!supported_params)
-               return true;
-
        if (coalesce->rx_coalesce_usecs)
                nonzero_params |= ETHTOOL_COALESCE_RX_USECS;
        if (coalesce->rx_max_coalesced_frames)