ethtool: Change ethtool_op_set_flags to validate flags

ethtool_op_set_flags() does not check for unsupported flags, and has
no way of doing so.  This means it is not suitable for use as a
default implementation of ethtool_ops::set_flags.

Add a 'supported' parameter specifying the flags that the driver and
hardware support, validate the requested flags against this, and
change all current callers to pass this parameter.

Change some other trivial implementations of ethtool_ops::set_flags to
call ethtool_op_set_flags().

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Reviewed-by: Stanislaw Gruszka <sgruszka@redhat.com>
Acked-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 3 deletions

diff --git a/drivers/net/myri10ge/myri10ge.c b/drivers/net/myri10ge/myri10ge.c
index e0b47cc8a86e..d771d1650d60 100644
--- a/drivers/net/myri10ge/myri10ge.c
+++ b/drivers/net/myri10ge/myri10ge.c
@@ -1730,8 +1730,7 @@ static int myri10ge_set_rx_csum(struct net_device *netdev, u32 csum_enabled)
         if (csum_enabled)
                 mgp->csum_flag = MXGEFW_FLAGS_CKSUM;
         else {
-                u32 flags = ethtool_op_get_flags(netdev);
-                err = ethtool_op_set_flags(netdev, (flags & ~ETH_FLAG_LRO));
+                netdev->features &= ~NETIF_F_LRO;
                 mgp->csum_flag = 0;
 
         }
@@ -1900,6 +1899,11 @@ static u32 myri10ge_get_msglevel(struct net_device *netdev)
         return mgp->msg_enable;
 }
 
+static int myri10ge_set_flags(struct net_device *netdev, u32 value)
+{
+        return ethtool_op_set_flags(netdev, value, ETH_FLAG_LRO);
+}
+
 static const struct ethtool_ops myri10ge_ethtool_ops = {
         .get_settings = myri10ge_get_settings,
         .get_drvinfo = myri10ge_get_drvinfo,
@@ -1920,7 +1924,7 @@ static const struct ethtool_ops myri10ge_ethtool_ops = {
         .set_msglevel = myri10ge_set_msglevel,
         .get_msglevel = myri10ge_get_msglevel,
         .get_flags = ethtool_op_get_flags,
-        .set_flags = ethtool_op_set_flags
+        .set_flags = myri10ge_set_flags
 };
 
 static int myri10ge_allocate_rings(struct myri10ge_slice_state *ss)