netdev - Re: [PATCH] net: drop NETIF_F_GSO from hw_features without NETIF_F

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Message-ID: <20110320185654.GA14223@core.hellgate.ch>
Date:	Sun, 20 Mar 2011 19:56:54 +0100
From:	Roger Luethi <rl@...lgate.ch>
To:	Micha? Miros?aw <mirqus@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] net: drop NETIF_F_GSO from hw_features without
 NETIF_F_SG

On Sat, 19 Mar 2011 17:18:17 +0100, Micha? Miros?aw wrote:
> > However, I still think the current, unpatched behavior is confusing users.
> > ethtool_get_features() will happily tell the user that GSO is available for
> > a NIC even if it is not (because the NIC does not support SG). Then, if the
> > user tries to enable GSO, the operation fails silently: ethtool won't get
> > an error code, so it looks as if the operation succeeded. The user needs to
> > look into the kernel log or actually verify the offload settings to realize
> > that something went wrong.
> 
> Do you want to prepare a patch for this? Please remember about
> compatibility with per-offload ethtool ops if you do - this needs to
> be there until all drivers are converted to hw_features.

Something like this?

diff --git a/net/core/dev.c b/net/core/dev.c
index 0b88eba..5861a59 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5442,6 +5442,9 @@ int register_netdevice(struct net_device *dev)
 	if (!(dev->wanted_features & NETIF_F_SG)) {
 		dev->wanted_features &= ~NETIF_F_GSO;
 		dev->features &= ~NETIF_F_GSO;
+		if (!(dev->hw_features & NETIF_F_SG) &&
+		    (!dev->ethtool_ops || !dev->ethtool_ops->set_sg))
+			dev->hw_features &= ~NETIF_F_GSO;
 	}
 
 	/* Enable GRO and NETIF_F_HIGHDMA for vlans by default,
--
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