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Merge branch 'vlan_features'

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Michal Kubecek says:

====================
net: device features handling fixes

> I think we need to think more about what exact behavior is desired in
> mixed csum feature set cases.  Probably whatever csum offload type is
> the most prevelant should be the one advertised by the master.  It
> means we will do that software checksum fixup for the oddball slaves,
> but it seems the best we can do.

I've been thinking about it some more and I believe what I proposed is
correct: features that are or-ed (ONE_FOR_ALL) should start with 0,
those which are and-ed (ALL_FOR_ALL) with 1.

But once we do that, we have to fix another problem in vlan module:
features of a vlan device are mostly computed as bitwise AND of features
and vlan_features of its underlying device. The problem is checksumming
features don't really behave like independent flags as their main
purpose is to be used in can_checksum_protocol() whose logic is that
HW_CSUM (GEN_CSUM) means "can checksum everything" so that it kind of
contains IP(V6)_CSUM functionality. Therefore intersection of HW_CSUM
and IP(V6)_CSUM should result in the latter.

An alternative approach would be to always set IP(V6)_CSUM once HW_CSUM
(any of GEN_CSUM) is set but as for long time people were taught not to
do that and we even have a warning for it, switching to the exact
opposite could cause a lot of problems.

> Also, like Jay, I agree that whatever we do in bonding needs to be
> done in team too and I'd like the bug fixed at the same time in both
> places.

Agreed. Added a similar patch for teaming driver.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2014-05-22 15:07:31 -04:00
commit a33fa47e89
4 changed files with 18 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/net/bonding/bond_main.c
View File

@ -1038,6 +1038,7 @@ static void bond_compute_features(struct bonding *bond)
if (!bond_has_slaves(bond))
goto done;
vlan_features &= NETIF_F_ALL_FOR_ALL;
bond_for_each_slave(bond, slave, iter) {
vlan_features = netdev_increment_features(vlan_features,

2
drivers/net/team/team.c
View File

@ -968,7 +968,7 @@ static void team_port_disable(struct team *team,
static void __team_compute_features(struct team *team)
{
struct team_port *port;
u32 vlan_features = TEAM_VLAN_FEATURES;
u32 vlan_features = TEAM_VLAN_FEATURES & NETIF_F_ALL_FOR_ALL;
unsigned short max_hard_header_len = ETH_HLEN;
unsigned int flags, dst_release_flag = IFF_XMIT_DST_RELEASE;

14
include/linux/netdevice.h
View File

@ -3153,6 +3153,20 @@ const char *netdev_drivername(const struct net_device *dev);
void linkwatch_run_queue(void);
static inline netdev_features_t netdev_intersect_features(netdev_features_t f1,
netdev_features_t f2)
{
if (f1 & NETIF_F_GEN_CSUM)
f1 |= (NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
if (f2 & NETIF_F_GEN_CSUM)
f2 |= (NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
f1 &= f2;
if (f1 & NETIF_F_GEN_CSUM)
f1 &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
return f1;
}
static inline netdev_features_t netdev_get_wanted_features(
struct net_device *dev)
{

4
net/8021q/vlan_dev.c
View File

@ -678,9 +678,9 @@ static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
netdev_features_t old_features = features;
features &= real_dev->vlan_features;
features = netdev_intersect_features(features, real_dev->vlan_features);
features |= NETIF_F_RXCSUM;
features &= real_dev->features;
features = netdev_intersect_features(features, real_dev->features);
features |= old_features & NETIF_F_SOFT_FEATURES;
features |= NETIF_F_LLTX;