netdev - [RESEND PATCH net] net: fix ETHTOOL_SFEATURES compatibility with old ethtool_ops.set

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Message-Id: <7bcc407f555d2fbbcd66d26e4b0195060cf8c063.1306405895.git.mirq-linux@rere.qmqm.pl>
Date:	Thu, 26 May 2011 12:42:57 +0200 (CEST)
From:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:	netdev@...r.kernel.org
Cc:	David Miller <davem@...emloft.net>,
	Ben Hutchings <bhutchings@...arflare.com>
Subject: [RESEND PATCH net] net: fix ETHTOOL_SFEATURES compatibility with old ethtool_ops.set_flags

Current code squashes flags to bool - this makes set_flags fail whenever
some ETH_FLAG_* equivalent features are set. Fix this.

Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
---
 net/core/ethtool.c |   25 ++++++++++++++++++++++++-
 1 files changed, 24 insertions(+), 1 deletions(-)

diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 84e7304..fd14116 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -233,6 +233,29 @@ static int ethtool_set_feature_compat(struct net_device *dev,
 	return 1;
 }
 
+static int ethtool_set_flags_compat(struct net_device *dev,
+	int (*legacy_set)(struct net_device *, u32),
+	struct ethtool_set_features_block *features, u32 mask)
+{
+	u32 value;
+
+	if (!legacy_set)
+		return 0;
+
+	if (!(features[0].valid & mask))
+		return 0;
+
+	value = dev->features & ~features[0].valid;
+	value |= features[0].requested;
+
+	features[0].valid &= ~mask;
+
+	if (legacy_set(dev, value & mask) < 0)
+		netdev_info(dev, "Legacy flags change failed\n");
+
+	return 1;
+}
+
 static int ethtool_set_features_compat(struct net_device *dev,
 	struct ethtool_set_features_block *features)
 {
@@ -249,7 +272,7 @@ static int ethtool_set_features_compat(struct net_device *dev,
 		features, NETIF_F_ALL_TSO);
 	compat |= ethtool_set_feature_compat(dev, dev->ethtool_ops->set_rx_csum,
 		features, NETIF_F_RXCSUM);
-	compat |= ethtool_set_feature_compat(dev, dev->ethtool_ops->set_flags,
+	compat |= ethtool_set_flags_compat(dev, dev->ethtool_ops->set_flags,
 		features, flags_dup_features);
 
 	return compat;
-- 
1.7.2.5

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