linux-kernel - [PATCH net-next v3] net-e1000e: fix ethtool set_features taking new features into account too late

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Message-Id: <0c2a178ff250edb110f343815ab82af2d1a8750b.1321996918.git.david.decotigny@google.com>
Date:	Tue, 22 Nov 2011 13:22:27 -0800
From:	David Decotigny <david.decotigny@...gle.com>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Bruce Allan <bruce.w.allan@...el.com>,
	Carolyn Wyborny <carolyn.wyborny@...el.com>,
	Don Skidmore <donald.c.skidmore@...el.com>,
	Greg Rose <gregory.v.rose@...el.com>,
	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>,
	Alex Duyck <alexander.h.duyck@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	e1000-devel@...ts.sourceforge.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	David Decotigny <david.decotigny@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Ian Campbell <ian.campbell@...rix.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [PATCH net-next v3] net-e1000e: fix ethtool set_features taking new features into account too late

Before this patch, the set_features() ethtool callback would not take
the new specified features into account when configuring the NIC. It
would only consider the current features, ie. the ones after previous
set_features(). A second ethtool set_features() with the same
specified features cannot work around that issue because it would boil
down to a nop (code checks wether specified features changed or not).

This patch solves this by propagating the requested features.

Tested:
  printk in code + custom ethtool (based on
  http://patchwork.ozlabs.org/patch/95836/)



Signed-off-by: David Decotigny <david.decotigny@...gle.com>
---
 drivers/net/ethernet/intel/e1000e/netdev.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index a5bd7a3..a83a108 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -5901,7 +5901,7 @@ static void e1000_eeprom_checks(struct e1000_adapter *adapter)
 }
 
 static int e1000_set_features(struct net_device *netdev,
-	netdev_features_t features)
+			      netdev_features_t features)
 {
 	struct e1000_adapter *adapter = netdev_priv(netdev);
 	netdev_features_t changed = features ^ netdev->features;
@@ -5913,12 +5913,19 @@ static int e1000_set_features(struct net_device *netdev,
 			 NETIF_F_RXCSUM)))
 		return 0;
 
+	/* We will make sure to return 1 below so that we can change
+	 * netdev->features on the fly from within the functions
+	 * called below in case of error, without core/dev.c
+	 * overriding it. */
+	netdev->features = features;
+
 	if (netif_running(netdev))
 		e1000e_reinit_locked(adapter);
 	else
 		e1000e_reset(adapter);
 
-	return 0;
+	return 1; /* tell net/core/dev.c not to override
+		   * netdev->features */
 }
 
 static const struct net_device_ops e1000e_netdev_ops = {
-- 
1.7.3.1

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