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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
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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
View File

@ -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
View File

@ -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
View File

@ -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
View File

@ -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
View File

@ -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
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);

1
net/core/ethtool.c
View File

@ -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",