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Message-ID: <7188429a-c380-14c8-57bb-9d05d3ba4e5e@linux.dev>
Date: Thu, 25 May 2023 16:42:46 -0700
From: Martin KaFai Lau <martin.lau@...ux.dev>
To: Lorenz Bauer <lmb@...valent.com>
Cc: Joe Stringer <joe@...ium.io>, Martin KaFai Lau <kafai@...com>,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>, Song Liu <song@...nel.org>,
Yonghong Song <yhs@...com>, John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...gle.com>,
Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
David Ahern <dsahern@...nel.org>,
Willem de Bruijn <willemdebruijn.kernel@...il.com>,
Joe Stringer <joe@...d.net.nz>
Subject: Re: [PATCH bpf-next 1/2] bpf, net: Support SO_REUSEPORT sockets with
bpf_sk_assign
On 5/25/23 1:19 AM, Lorenz Bauer wrote:
> diff --git a/include/net/inet6_hashtables.h b/include/net/inet6_hashtables.h
> index 56f1286583d3..3ba4dc2703da 100644
> --- a/include/net/inet6_hashtables.h
> +++ b/include/net/inet6_hashtables.h
> @@ -48,6 +48,13 @@ struct sock *__inet6_lookup_established(struct net *net,
> const u16 hnum, const int dif,
> const int sdif);
>
> +struct sock *inet6_lookup_reuseport(struct net *net, struct sock *sk,
> + struct sk_buff *skb, int doff,
> + const struct in6_addr *saddr,
> + __be16 sport,
> + const struct in6_addr *daddr,
> + unsigned short hnum);
> +
> struct sock *inet6_lookup_listener(struct net *net,
> struct inet_hashinfo *hashinfo,
> struct sk_buff *skb, int doff,
> @@ -85,14 +92,33 @@ static inline struct sock *__inet6_lookup_skb(struct inet_hashinfo *hashinfo,
> int iif, int sdif,
> bool *refcounted)
> {
> - struct sock *sk = skb_steal_sock(skb, refcounted);
> -
> + bool prefetched;
> + struct sock *sk = skb_steal_sock(skb, refcounted, &prefetched);
> + struct net *net = dev_net(skb_dst(skb)->dev);
> + const struct ipv6hdr *ip6h = ipv6_hdr(skb);
> +
> + if (prefetched) {
> + struct sock *reuse_sk = inet6_lookup_reuseport(net, sk, skb, doff,
If sk is TCP_ESTABLISHED, I suspect sk->sk_reuseport is 1 (from sk_clone)?
If it is, it should still work other than an extra inet6_ehashfn. Does it worth
an extra sk->sk_state check or it is overkill?
> + &ip6h->saddr, sport,
> + &ip6h->daddr, ntohs(dport));
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