unimore/kernel-hacking-2024-linux-steffo
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vxlan: allow L4 GRO passthrough

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When passing up an UDP GSO packet with L4 aggregation, there is
no need to segment it at the vxlan level. We can propagate the
packet untouched and let it be segmented later, if needed.

Introduce an helper to allow let the UDP socket to accept any
L4 aggregation and use it in the vxlan driver.

v1 -> v2:
 - updated to use the newly introduced UDP socket 'accept*' fields

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2021-03-30 12:28:53 +02:00 committed by David S. Miller
parent 78352f73dc
commit d18931a92a
2 changed files with 7 additions and 0 deletions
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1
drivers/net/vxlan.c
View file

@ -3484,6 +3484,7 @@ static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
if (err < 0)
return ERR_PTR(err);
udp_allow_gso(sock->sk);
return sock;
}

6
include/linux/udp.h
View file

@ -145,6 +145,12 @@ static inline bool udp_unexpected_gso(struct sock *sk, struct sk_buff *skb)
return false;
}
static inline void udp_allow_gso(struct sock *sk)
{
udp_sk(sk)->accept_udp_l4 = 1;
udp_sk(sk)->accept_udp_fraglist = 1;
}
#define udp_portaddr_for_each_entry(__sk, list) \
hlist_for_each_entry(__sk, list, __sk_common.skc_portaddr_node)