From: Jesper Dangaard Brouer <brouer@redhat.com>
To: "Maciej Żenczykowski" <maze@google.com>
Cc: bpf <bpf@vger.kernel.org>, Linux NetDev <netdev@vger.kernel.org>,
Daniel Borkmann <borkmann@iogearbox.net>,
Alexei Starovoitov <alexei.starovoitov@gmail.com>,
Lorenz Bauer <lmb@cloudflare.com>,
Shaun Crampton <shaun@tigera.io>,
Lorenzo Bianconi <lorenzo@kernel.org>,
Marek Majkowski <marek@cloudflare.com>,
John Fastabend <john.fastabend@gmail.com>,
Jakub Kicinski <kuba@kernel.org>,
Eyal Birger <eyal.birger@gmail.com>,
brouer@redhat.com
Subject: Re: [PATCH bpf-next V2 1/6] bpf: Remove MTU check in __bpf_skb_max_len
Date: Thu, 8 Oct 2020 13:06:32 +0200 [thread overview]
Message-ID: <20201008130632.0c407bad@carbon> (raw)
In-Reply-To: <CANP3RGeU4sMjgAjXHVRc0ES9as0tG2kBUw6jRZhz6vLTTtVEVA@mail.gmail.com>
On Wed, 7 Oct 2020 16:46:10 -0700
Maciej Żenczykowski <maze@google.com> wrote:
> > static u32 __bpf_skb_max_len(const struct sk_buff *skb)
> > {
> > - return skb->dev ? skb->dev->mtu + skb->dev->hard_header_len :
> > - SKB_MAX_ALLOC;
> > + return IP_MAX_MTU;
> > }
>
> Shouldn't we just delete this helper instead and replace call sites?
It does seem wrong to pass argument skb into this function, as it is
no-longer used...
Guess I can simply replace __bpf_skb_max_len with IP_MAX_MTU.
--
Best regards,
Jesper Dangaard Brouer
MSc.CS, Principal Kernel Engineer at Red Hat
LinkedIn: http://www.linkedin.com/in/brouer
next prev parent reply other threads:[~2020-10-08 11:06 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-07 16:22 [PATCH bpf-next V2 0/6] bpf: New approach for BPF MTU handling and enforcement Jesper Dangaard Brouer
2020-10-07 16:22 ` [PATCH bpf-next V2 1/6] bpf: Remove MTU check in __bpf_skb_max_len Jesper Dangaard Brouer
2020-10-07 21:26 ` Daniel Borkmann
2020-10-07 23:46 ` Maciej Żenczykowski
2020-10-08 11:06 ` Jesper Dangaard Brouer [this message]
2020-10-08 12:33 ` Willem de Bruijn
2020-10-08 14:07 ` Jesper Dangaard Brouer
2020-10-07 16:22 ` [PATCH bpf-next V2 2/6] bpf: bpf_fib_lookup return MTU value as output when looked up Jesper Dangaard Brouer
2020-10-07 16:22 ` [PATCH bpf-next V2 3/6] bpf: add BPF-helper for MTU checking Jesper Dangaard Brouer
2020-10-07 16:22 ` [PATCH bpf-next V2 4/6] bpf: make it possible to identify BPF redirected SKBs Jesper Dangaard Brouer
2020-10-07 16:23 ` [PATCH bpf-next V2 5/6] bpf: Add MTU check for TC-BPF packets after egress hook Jesper Dangaard Brouer
2020-10-07 21:37 ` Daniel Borkmann
2020-10-07 22:36 ` John Fastabend
2020-10-07 23:52 ` Maciej Żenczykowski
2020-10-08 3:19 ` John Fastabend
2020-10-08 8:07 ` Jesper Dangaard Brouer
2020-10-08 8:25 ` Daniel Borkmann
2020-10-08 8:30 ` Jesper Dangaard Brouer
2020-10-07 16:23 ` [PATCH bpf-next V2 6/6] bpf: drop MTU check when doing TC-BPF redirect to ingress Jesper Dangaard Brouer
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