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net: Fix disjunct computation of netdev features 

My change

    commit e2a6b85247
    net: Enable TSO if supported by at least one device

didn't do what was intended because the netdev_compute_features
function was designed for conjunctions.  So what happened was that
it would simply take the TSO status of the last constituent device.

This patch extends it to support both conjunctions and disjunctions
under the new name of netdev_increment_features.

It also adds a new function netdev_fix_features which does the
sanity checking that usually occurs upon registration.  This ensures
that the computation doesn't result in an illegal combination
since this checking is absent when the change is initiated via
ethtool.

The two users of netdev_compute_features have been converted.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2008-10-23 01:11:29 -07:00 committed by David S. Miller
parent 2e3f92dad6
commit b63365a2d6
5 changed files with 103 additions and 74 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/net/bonding/bond_main.c
View File

@ -1341,18 +1341,24 @@ static int bond_compute_features(struct bonding *bond)
int i;
features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
NETIF_F_GSO_MASK | NETIF_F_NO_CSUM;
features |= NETIF_F_GSO_MASK | NETIF_F_NO_CSUM;
if (!bond->first_slave)
goto done;
features &= ~NETIF_F_ONE_FOR_ALL;
bond_for_each_slave(bond, slave, i) {
features = netdev_compute_features(features,
slave->dev->features);
features = netdev_increment_features(features,
slave->dev->features,
NETIF_F_ONE_FOR_ALL);
if (slave->dev->hard_header_len > max_hard_header_len)
max_hard_header_len = slave->dev->hard_header_len;
}
done:
features |= (bond_dev->features & BOND_VLAN_FEATURES);
bond_dev->features = features;
bond_dev->features = netdev_fix_features(features, NULL);
bond_dev->hard_header_len = max_hard_header_len;
return 0;

12
include/linux/netdevice.h
View File

@ -541,6 +541,14 @@ struct net_device
#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)
/*
* If one device supports one of these features, then enable them
* for all in netdev_increment_features.
*/
#define NETIF_F_ONE_FOR_ALL (NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ROBUST | \
NETIF_F_SG | NETIF_F_HIGHDMA | \
NETIF_F_FRAGLIST)
/* Interface index. Unique device identifier */
int ifindex;
int iflink;
@ -1698,7 +1706,9 @@ extern char *netdev_drivername(const struct net_device *dev, char *buffer, int l
extern void linkwatch_run_queue(void);
extern int netdev_compute_features(unsigned long all, unsigned long one);
unsigned long netdev_increment_features(unsigned long all, unsigned long one,
unsigned long mask);
unsigned long netdev_fix_features(unsigned long features, const char *name);
static inline int net_gso_ok(int features, int gso_type)
{

2
net/bridge/br_device.c
View File

@ -179,5 +179,5 @@ void br_dev_setup(struct net_device *dev)
dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX |
NETIF_F_NETNS_LOCAL;
NETIF_F_NETNS_LOCAL | NETIF_F_GSO;
}

14
net/bridge/br_if.c
View File

@ -347,15 +347,21 @@ int br_min_mtu(const struct net_bridge *br)
void br_features_recompute(struct net_bridge *br)
{
struct net_bridge_port *p;
unsigned long features;
unsigned long features, mask;
features = br->feature_mask;
features = mask = br->feature_mask;
if (list_empty(&br->port_list))
goto done;
features &= ~NETIF_F_ONE_FOR_ALL;
list_for_each_entry(p, &br->port_list, list) {
features = netdev_compute_features(features, p->dev->features);
features = netdev_increment_features(features,
p->dev->features, mask);
}
br->dev->features = features;
done:
br->dev->features = netdev_fix_features(features, NULL);
}
/* called with RTNL */

133
net/core/dev.c
View File

@ -3947,6 +3947,46 @@ static void netdev_init_queue_locks(struct net_device *dev)
__netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL);
}
unsigned long netdev_fix_features(unsigned long features, const char *name)
{
/* Fix illegal SG+CSUM combinations. */
if ((features & NETIF_F_SG) &&
!(features & NETIF_F_ALL_CSUM)) {
if (name)
printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no "
"checksum feature.\n", name);
features &= ~NETIF_F_SG;
}
/* TSO requires that SG is present as well. */
if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
if (name)
printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no "
"SG feature.\n", name);
features &= ~NETIF_F_TSO;
}
if (features & NETIF_F_UFO) {
if (!(features & NETIF_F_GEN_CSUM)) {
if (name)
printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
"since no NETIF_F_HW_CSUM feature.\n",
name);
features &= ~NETIF_F_UFO;
}
if (!(features & NETIF_F_SG)) {
if (name)
printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
"since no NETIF_F_SG feature.\n", name);
features &= ~NETIF_F_UFO;
}
}
return features;
}
EXPORT_SYMBOL(netdev_fix_features);
/**
* register_netdevice - register a network device
* @dev: device to register
@ -4032,36 +4072,7 @@ int register_netdevice(struct net_device *dev)
dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
}
/* Fix illegal SG+CSUM combinations. */
if ((dev->features & NETIF_F_SG) &&
!(dev->features & NETIF_F_ALL_CSUM)) {
printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no checksum feature.\n",
dev->name);
dev->features &= ~NETIF_F_SG;
}
/* TSO requires that SG is present as well. */
if ((dev->features & NETIF_F_TSO) &&
!(dev->features & NETIF_F_SG)) {
printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no SG feature.\n",
dev->name);
dev->features &= ~NETIF_F_TSO;
}
if (dev->features & NETIF_F_UFO) {
if (!(dev->features & NETIF_F_HW_CSUM)) {
printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
"NETIF_F_HW_CSUM feature.\n",
dev->name);
dev->features &= ~NETIF_F_UFO;
}
if (!(dev->features & NETIF_F_SG)) {
printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
"NETIF_F_SG feature.\n",
dev->name);
dev->features &= ~NETIF_F_UFO;
}
}
dev->features = netdev_fix_features(dev->features, dev->name);
/* Enable software GSO if SG is supported. */
if (dev->features & NETIF_F_SG)
@ -4700,49 +4711,45 @@ static int __init netdev_dma_register(void) { return -ENODEV; }
#endif /* CONFIG_NET_DMA */
/**
* netdev_compute_feature - compute conjunction of two feature sets
* @all: first feature set
* @one: second feature set
* netdev_increment_features - increment feature set by one
* @all: current feature set
* @one: new feature set
* @mask: mask feature set
*
* Computes a new feature set after adding a device with feature set
* @one to the master device with current feature set @all. Returns
* the new feature set.
* @one to the master device with current feature set @all. Will not
* enable anything that is off in @mask. Returns the new feature set.
*/
int netdev_compute_features(unsigned long all, unsigned long one)
unsigned long netdev_increment_features(unsigned long all, unsigned long one,
unsigned long mask)
{
/* if device needs checksumming, downgrade to hw checksumming */
if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
all ^= NETIF_F_NO_CSUM | NETIF_F_HW_CSUM;
/* 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 device can't do all checksum, downgrade to ipv4/ipv6 */
if (all & NETIF_F_HW_CSUM && !(one & NETIF_F_HW_CSUM))
all ^= NETIF_F_HW_CSUM
| NETIF_F_IP_CSUM | NETIF_F_IPV6_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 (one & NETIF_F_GSO)
one |= NETIF_F_GSO_SOFTWARE;
one |= NETIF_F_GSO;
one |= NETIF_F_ALL_CSUM;
/*
* If even one device supports a GSO protocol with software fallback,
* enable it for all.
*/
all |= one & NETIF_F_GSO_SOFTWARE;
/* If even one device supports robust GSO, enable it for all. */
if (one & NETIF_F_GSO_ROBUST)
all |= NETIF_F_GSO_ROBUST;
all &= one | NETIF_F_LLTX;
if (!(all & NETIF_F_ALL_CSUM))
all &= ~NETIF_F_SG;
if (!(all & NETIF_F_SG))
all &= ~NETIF_F_GSO_MASK;
one |= all & NETIF_F_ONE_FOR_ALL;
all &= one | NETIF_F_LLTX | NETIF_F_GSO;
all |= one & mask & NETIF_F_ONE_FOR_ALL;
return all;
}
EXPORT_SYMBOL(netdev_compute_features);
EXPORT_SYMBOL(netdev_increment_features);
static struct hlist_head *netdev_create_hash(void)
{