lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

net: remove NETIF_F_NO_CSUM feature bit

Browse Source 
Only distinct use is checking if NETIF_F_NOCACHE_COPY should be
enabled by default. The check heuristics is altered a bit here,
so it hits other people than before. The default shouldn't be
trusted for performance-critical cases anyway.

For all other uses NETIF_F_NO_CSUM is equivalent to NETIF_F_HW_CSUM.

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
2011-11-15 15:29:55 +00:00
committed by David S. Miller
parent a861a8b233
commit 34324dc2bf
14 changed files with 19 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
net/core/dev.c
View File

@ -5362,12 +5362,6 @@ static netdev_features_t netdev_fix_features(struct net_device *dev,
features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
}
if ((features & NETIF_F_NO_CSUM) &&
(features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
netdev_warn(dev, "mixed no checksumming and other settings.\n");
features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
}
/* Fix illegal SG+CSUM combinations. */
if ((features & NETIF_F_SG) &&
!(features & NETIF_F_ALL_CSUM)) {
@ -5624,11 +5618,12 @@ int register_netdevice(struct net_device *dev)
dev->wanted_features = dev->features & dev->hw_features;
/* Turn on no cache copy if HW is doing checksum */
dev->hw_features |= NETIF_F_NOCACHE_COPY;
if ((dev->features & NETIF_F_ALL_CSUM) &&
!(dev->features & NETIF_F_NO_CSUM)) {
dev->wanted_features |= NETIF_F_NOCACHE_COPY;
dev->features |= NETIF_F_NOCACHE_COPY;
if (!(dev->flags & IFF_LOOPBACK)) {
dev->hw_features |= NETIF_F_NOCACHE_COPY;
if (dev->features & NETIF_F_ALL_CSUM) {
dev->wanted_features |= NETIF_F_NOCACHE_COPY;
dev->features |= NETIF_F_NOCACHE_COPY;
}
}
/* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
@ -6374,10 +6369,6 @@ netdev_features_t netdev_increment_features(netdev_features_t all,
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_ALL_CSUM & ~NETIF_F_NO_CSUM))
all &= ~NETIF_F_NO_CSUM;
/* If one device supports hw checksumming, set for all. */
if (all & NETIF_F_GEN_CSUM)
all &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);