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net: Fix gso_features_check to check for both dev->gso_{ipv4_,}max_size

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Commit 24ab059d2e ("net: check dev->gso_max_size in gso_features_check()")
added a dev->gso_max_size test to gso_features_check() in order to fall
back to GSO when needed.

This was added as it was noticed that some drivers could misbehave if TSO
packets get too big. However, the check doesn't respect dev->gso_ipv4_max_size
limit. For instance, a device could be configured with BIG TCP for IPv4,
but not IPv6.

Therefore, add a netif_get_gso_max_size() equivalent to netif_get_gro_max_size()
and use the helper to respect both limits before falling back to GSO engine.

Fixes: 24ab059d2e ("net: check dev->gso_max_size in gso_features_check()")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20240923212242.15669-2-daniel@iogearbox.net
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Daniel Borkmann 2024-09-23 23:22:42 +02:00 committed by Paolo Abeni
parent e8d4d34df7
commit e609c959a9
2 changed files with 10 additions and 1 deletions
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9
include/linux/netdevice.h
View File

@ -5038,6 +5038,15 @@ netif_get_gro_max_size(const struct net_device *dev, const struct sk_buff *skb)
READ_ONCE(dev->gro_ipv4_max_size);
}
static inline unsigned int
netif_get_gso_max_size(const struct net_device *dev, const struct sk_buff *skb)
{
/* pairs with WRITE_ONCE() in netif_set_gso(_ipv4)_max_size() */
return skb->protocol == htons(ETH_P_IPV6) ?
READ_ONCE(dev->gso_max_size) :
READ_ONCE(dev->gso_ipv4_max_size);
}
static inline bool netif_is_macsec(const struct net_device *dev)
{
return dev->priv_flags & IFF_MACSEC;

2
net/core/dev.c
View File

@ -3512,7 +3512,7 @@ static netdev_features_t gso_features_check(const struct sk_buff *skb,
if (gso_segs > READ_ONCE(dev->gso_max_segs))
return features & ~NETIF_F_GSO_MASK;
if (unlikely(skb->len >= READ_ONCE(dev->gso_max_size)))
if (unlikely(skb->len >= netif_get_gso_max_size(dev, skb)))
return features & ~NETIF_F_GSO_MASK;
if (!skb_shinfo(skb)->gso_type) {