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Message-ID: <20241101164840.73324-1-kuniyu@amazon.com>
Date: Fri, 1 Nov 2024 09:48:40 -0700
From: Kuniyuki Iwashima <kuniyu@...zon.com>
To: <lulie@...ux.alibaba.com>
CC: <antony.antony@...unet.com>, <davem@...emloft.net>, <dsahern@...nel.org>,
<dust.li@...ux.alibaba.com>, <edumazet@...gle.com>,
<fred.cc@...baba-inc.com>, <horms@...nel.org>, <jakub@...udflare.com>,
<kuba@...nel.org>, <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
<pabeni@...hat.com>, <steffen.klassert@...unet.com>,
<willemdebruijn.kernel@...il.com>, <yubing.qiuyubing@...baba-inc.com>,
<kuniyu@...zon.com>
Subject: Re: [PATCH v6 net-next 4/4] ipv6/udp: Add 4-tuple hash for connected socket
From: Philo Lu <lulie@...ux.alibaba.com>
Date: Fri, 1 Nov 2024 19:40:19 +0800
> On 2024/10/31 20:45, Philo Lu wrote:
> > Implement ipv6 udp hash4 like that in ipv4. The major difference is that
> > the hash value should be calculated with udp6_ehashfn(). Besides,
> > ipv4-mapped ipv6 address is handled before hash() and rehash().
> >
> > Core procedures of hash/unhash/rehash are same as ipv4, and udpv4 and
> > udpv6 share the same udptable, so some functions in ipv4 hash4 can also
> > be shared.
> >
> > Signed-off-by: Philo Lu <lulie@...ux.alibaba.com>
> > Signed-off-by: Cambda Zhu <cambda@...ux.alibaba.com>
> > Signed-off-by: Fred Chen <fred.cc@...baba-inc.com>
> > Signed-off-by: Yubing Qiu <yubing.qiuyubing@...baba-inc.com>
> > ---
> > net/ipv6/udp.c | 96 ++++++++++++++++++++++++++++++++++++++++++++++++--
> > 1 file changed, 94 insertions(+), 2 deletions(-)
> >
> > diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
> > index 1ea99d704e31..64f13f258fca 100644
> > --- a/net/ipv6/udp.c
> > +++ b/net/ipv6/udp.c
> > @@ -110,8 +110,17 @@ void udp_v6_rehash(struct sock *sk)
> > u16 new_hash = ipv6_portaddr_hash(sock_net(sk),
> > &sk->sk_v6_rcv_saddr,
> > inet_sk(sk)->inet_num);
> > + u16 new_hash4;
> >
> > - udp_lib_rehash(sk, new_hash, 0); /* 4-tuple hash not implemented */
> > + if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr)) {
> > + new_hash4 = udp_ehashfn(sock_net(sk), sk->sk_rcv_saddr, sk->sk_num,
> > + sk->sk_daddr, sk->sk_dport);
>
> Just found udp_ehashfn() used here results in an build error of
> undefined function.
>
> I think the `ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr)` branch can be
> moved into udp_lib_rehash() to fix the issue. So in the worst case, we
> need to calculate the newhash4 twice in ipv6 hash4 rehash, one in
> udp_v6_rehash() and the other in udp_lib_rehash().
You can simply export udp_ehashfn().
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