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net: fix netdev_increment_features()

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Simplify and fix netdev_increment_features() to conform to what is
stated in netdevice.h comments about NETIF_F_ONE_FOR_ALL.
Include FCoE segmentation and VLAN-challedged flags in computation.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michał Mirosław
2011-04-22 06:31:16 +00:00
committed by David S. Miller
parent 96339d6c49
commit 1742f183fc
2 changed files with 18 additions and 26 deletions
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37
net/core/dev.c
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@@ -6164,33 +6164,20 @@ static int dev_cpu_callback(struct notifier_block *nfb,
*/
u32 netdev_increment_features(u32 all, u32 one, u32 mask)
{
if (mask & NETIF_F_GEN_CSUM)
mask |= NETIF_F_ALL_CSUM;
mask |= NETIF_F_VLAN_CHALLENGED;
all |= one & (NETIF_F_ONE_FOR_ALL|NETIF_F_ALL_CSUM) & mask;
all &= one | ~NETIF_F_ALL_FOR_ALL;
/* If device needs checksumming, downgrade to it. */
if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM);
else if (mask & NETIF_F_ALL_CSUM) {
/* If one device supports v4/v6 checksumming, set for all. */
if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) &&
!(all & NETIF_F_GEN_CSUM)) {
all &= ~NETIF_F_ALL_CSUM;
all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
}
if (all & (NETIF_F_ALL_CSUM & ~NETIF_F_NO_CSUM))
all &= ~NETIF_F_NO_CSUM;
/* If one device supports hw checksumming, set for all. */
if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) {
all &= ~NETIF_F_ALL_CSUM;
all |= NETIF_F_HW_CSUM;
}
}
/* If device can't no cache copy, don't do for all */
if (!(one & NETIF_F_NOCACHE_COPY))
all &= ~NETIF_F_NOCACHE_COPY;
one |= NETIF_F_ALL_CSUM;
one |= all & NETIF_F_ONE_FOR_ALL;
all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO;
all |= one & mask & NETIF_F_ONE_FOR_ALL;
/* If one device supports hw checksumming, set for all. */
if (all & NETIF_F_GEN_CSUM)
all &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
return all;
}