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net: remove NETIF_F_NO_CSUM feature bit

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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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/ieee802154/fakehard.c
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@ -343,7 +343,7 @@ static void ieee802154_fake_setup(struct net_device *dev)
{
dev->addr_len = IEEE802154_ADDR_LEN;
memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
dev->features = NETIF_F_NO_CSUM;
dev->features = NETIF_F_HW_CSUM;
dev->needed_tailroom = 2; /* FCS */
dev->mtu = 127;
dev->tx_queue_len = 10;

2
drivers/misc/sgi-xp/xpnet.c
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@ -576,7 +576,7 @@ xpnet_init(void)
* report an error if the data is not retrievable and the
* packet will be dropped.
*/
xpnet_device->features = NETIF_F_NO_CSUM;
xpnet_device->features = NETIF_F_HW_CSUM;
result = register_netdev(xpnet_device);
if (result != 0) {

2
drivers/net/bonding/bond_main.c
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@ -4361,7 +4361,7 @@ static void bond_setup(struct net_device *bond_dev)
NETIF_F_HW_VLAN_RX |
NETIF_F_HW_VLAN_FILTER;
bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_NO_CSUM);
bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
bond_dev->features |= bond_dev->hw_features;
}

2
drivers/net/can/dev.c
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@ -454,7 +454,7 @@ static void can_setup(struct net_device *dev)
/* New-style flags. */
dev->flags = IFF_NOARP;
dev->features = NETIF_F_NO_CSUM;
dev->features = NETIF_F_HW_CSUM;
}
struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf)

2
drivers/net/can/slcan.c
View File

@ -387,7 +387,7 @@ static void slc_setup(struct net_device *dev)
/* New-style flags. */
dev->flags = IFF_NOARP;
dev->features = NETIF_F_NO_CSUM;
dev->features = NETIF_F_HW_CSUM;
}
/******************************************

2
drivers/net/dummy.c
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@ -134,7 +134,7 @@ static void dummy_setup(struct net_device *dev)
dev->flags |= IFF_NOARP;
dev->flags &= ~IFF_MULTICAST;
dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_TSO;
dev->features |= NETIF_F_NO_CSUM | NETIF_F_HIGHDMA | NETIF_F_LLTX;
dev->features |= NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_LLTX;
random_ether_addr(dev->dev_addr);
}

2
drivers/net/ifb.c
View File

@ -164,7 +164,7 @@ static const struct net_device_ops ifb_netdev_ops = {
.ndo_validate_addr = eth_validate_addr,
};
#define IFB_FEATURES (NETIF_F_NO_CSUM | NETIF_F_SG | NETIF_F_FRAGLIST | \
#define IFB_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | NETIF_F_FRAGLIST | \
NETIF_F_TSO_ECN | NETIF_F_TSO | NETIF_F_TSO6 | \
NETIF_F_HIGHDMA | NETIF_F_HW_VLAN_TX)

2
drivers/net/loopback.c
View File

@ -169,7 +169,7 @@ static void loopback_setup(struct net_device *dev)
dev->features = NETIF_F_SG | NETIF_F_FRAGLIST
| NETIF_F_ALL_TSO
| NETIF_F_UFO
| NETIF_F_NO_CSUM
| NETIF_F_HW_CSUM
| NETIF_F_RXCSUM
| NETIF_F_HIGHDMA
| NETIF_F_LLTX

2
drivers/net/veth.c
View File

@ -271,7 +271,7 @@ static void veth_setup(struct net_device *dev)
dev->features |= NETIF_F_LLTX;
dev->destructor = veth_dev_free;
dev->hw_features = NETIF_F_NO_CSUM | NETIF_F_SG | NETIF_F_RXCSUM;
dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG | NETIF_F_RXCSUM;
}
/*

5
include/linux/netdev_features.h
View File

@ -17,7 +17,7 @@ typedef u64 netdev_features_t;
enum {
NETIF_F_SG_BIT, /* Scatter/gather IO. */
NETIF_F_IP_CSUM_BIT, /* Can checksum TCP/UDP over IPv4. */
NETIF_F_NO_CSUM_BIT, /* Does not require checksum. F.e. loopack. */
__UNUSED_NETIF_F_1,
NETIF_F_HW_CSUM_BIT, /* Can checksum all the packets. */
NETIF_F_IPV6_CSUM_BIT, /* Can checksum TCP/UDP over IPV6 */
NETIF_F_HIGHDMA_BIT, /* Can DMA to high memory. */
@ -88,7 +88,6 @@ enum {
#define NETIF_F_LRO __NETIF_F(LRO)
#define NETIF_F_NETNS_LOCAL __NETIF_F(NETNS_LOCAL)
#define NETIF_F_NOCACHE_COPY __NETIF_F(NOCACHE_COPY)
#define NETIF_F_NO_CSUM __NETIF_F(NO_CSUM)
#define NETIF_F_NTUPLE __NETIF_F(NTUPLE)
#define NETIF_F_RXCSUM __NETIF_F(RXCSUM)
#define NETIF_F_RXHASH __NETIF_F(RXHASH)
@ -118,7 +117,7 @@ enum {
#define NETIF_F_GSO_SOFTWARE (NETIF_F_TSO | NETIF_F_TSO_ECN | \
NETIF_F_TSO6 | NETIF_F_UFO)
#define NETIF_F_GEN_CSUM (NETIF_F_HW_CSUM | NETIF_F_NO_CSUM)
#define NETIF_F_GEN_CSUM NETIF_F_HW_CSUM
#define NETIF_F_V4_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM)
#define NETIF_F_V6_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM)
#define NETIF_F_ALL_CSUM (NETIF_F_V4_CSUM | NETIF_F_V6_CSUM)

1
include/linux/skbuff.h
View File

@ -88,7 +88,6 @@
* at device setup time.
* NETIF_F_HW_CSUM - it is clever device, it is able to checksum
* everything.
* NETIF_F_NO_CSUM - loopback or reliable single hop media.
* NETIF_F_IP_CSUM - device is dumb. It is able to csum only
* TCP/UDP over IPv4. Sigh. Vendors like this
* way by an unknown reason. Though, see comment above

4
net/bridge/br_device.c
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@ -342,10 +342,10 @@ void br_dev_setup(struct net_device *dev)
dev->priv_flags = IFF_EBRIDGE;
dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX |
NETIF_F_GSO_MASK | NETIF_F_HW_CSUM | NETIF_F_LLTX |
NETIF_F_NETNS_LOCAL | NETIF_F_HW_VLAN_TX;
dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
NETIF_F_GSO_MASK | NETIF_F_NO_CSUM |
NETIF_F_GSO_MASK | NETIF_F_HW_CSUM |
NETIF_F_HW_VLAN_TX;
br->dev = dev;

21
net/core/dev.c
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@ -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);

1
net/core/ethtool.c
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@ -43,7 +43,6 @@ EXPORT_SYMBOL(ethtool_op_get_link);
static const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN] = {
[NETIF_F_SG_BIT] = "tx-scatter-gather",
[NETIF_F_IP_CSUM_BIT] = "tx-checksum-ipv4",
[NETIF_F_NO_CSUM_BIT] = "tx-checksum-unneeded",
[NETIF_F_HW_CSUM_BIT] = "tx-checksum-ip-generic",
[NETIF_F_IPV6_CSUM_BIT] = "tx-checksum-ipv6",
[NETIF_F_HIGHDMA_BIT] = "highdma",