net: Add netif_get_gro_max_size helper for GRO

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.

Daniel Borkmann committed 2 years ago

Commit e8d4d341 parent 6c24a032 files · +11 −7Browse files

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include/linux/netdevice.h+9−0

@@ -5029,6 +5029,15 @@ void netif_set_tso_max_segs(struct net_device *dev, unsigned int segs); · 5028 unmodified lines
5029	5029	void netif_inherit_tso_max(struct net_device *to,
5030	5030	const struct net_device *from);
5031	5031
	5032	+static inline unsigned int
	5033	+netif_get_gro_max_size(const struct net_device dev, const struct sk_buff skb)
	5034	+{
	5035	+ /* pairs with WRITE_ONCE() in netif_set_gro(_ipv4)_max_size() */
	5036	+ return skb->protocol == htons(ETH_P_IPV6) ?
	5037	+ READ_ONCE(dev->gro_max_size) :
	5038	+ READ_ONCE(dev->gro_ipv4_max_size);
	5039	+}
	5040	+
5032	5041	static inline bool netif_is_macsec(const struct net_device *dev)
5033	5042	{
5034	5043	return dev->priv_flags & IFF_MACSEC;