6.10-stable review patch. If anyone has any objections, please let me know.
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From: Daniel Borkmann daniel@iogearbox.net
[ Upstream commit e8d4d34df715133c319fabcf63fdec684be75ff8 ]
Add a small netif_get_gro_max_size() helper which returns the maximum IPv4 or IPv6 GRO size of the netdevice.
We later add a netif_get_gso_max_size() equivalent as well for GSO, so that these helpers can be used consistently instead of open-coded checks.
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/20240923212242.15669-1-daniel@iogearbox.net Signed-off-by: Paolo Abeni pabeni@redhat.com Stable-dep-of: e609c959a939 ("net: Fix gso_features_check to check for both dev->gso_{ipv4_,}max_size") Signed-off-by: Sasha Levin sashal@kernel.org --- include/linux/netdevice.h | 9 +++++++++ net/core/gro.c | 9 ++------- 2 files changed, 11 insertions(+), 7 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index d20c6c99eb887..84a445ca4749a 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -5000,6 +5000,15 @@ void netif_set_tso_max_segs(struct net_device *dev, unsigned int segs); void netif_inherit_tso_max(struct net_device *to, const struct net_device *from);
+static inline unsigned int +netif_get_gro_max_size(const struct net_device *dev, const struct sk_buff *skb) +{ + /* pairs with WRITE_ONCE() in netif_set_gro(_ipv4)_max_size() */ + return skb->protocol == htons(ETH_P_IPV6) ? + READ_ONCE(dev->gro_max_size) : + READ_ONCE(dev->gro_ipv4_max_size); +} + static inline bool netif_is_macsec(const struct net_device *dev) { return dev->priv_flags & IFF_MACSEC; diff --git a/net/core/gro.c b/net/core/gro.c index b3b43de1a6502..87708483a5f46 100644 --- a/net/core/gro.c +++ b/net/core/gro.c @@ -98,7 +98,6 @@ int skb_gro_receive(struct sk_buff *p, struct sk_buff *skb) unsigned int headlen = skb_headlen(skb); unsigned int len = skb_gro_len(skb); unsigned int delta_truesize; - unsigned int gro_max_size; unsigned int new_truesize; struct sk_buff *lp; int segs; @@ -112,12 +111,8 @@ int skb_gro_receive(struct sk_buff *p, struct sk_buff *skb) if (p->pp_recycle != skb->pp_recycle) return -ETOOMANYREFS;
- /* pairs with WRITE_ONCE() in netif_set_gro(_ipv4)_max_size() */ - gro_max_size = p->protocol == htons(ETH_P_IPV6) ? - READ_ONCE(p->dev->gro_max_size) : - READ_ONCE(p->dev->gro_ipv4_max_size); - - if (unlikely(p->len + len >= gro_max_size || NAPI_GRO_CB(skb)->flush)) + if (unlikely(p->len + len >= netif_get_gro_max_size(p->dev, p) || + NAPI_GRO_CB(skb)->flush)) return -E2BIG;
if (unlikely(p->len + len >= GRO_LEGACY_MAX_SIZE)) {