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From: Jakub Kicinski <kuba@kernel.org>
To: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: bpf@vger.kernel.org, netdev@vger.kernel.org,
	Daniel Borkmann <borkmann@iogearbox.net>,
	Alexei Starovoitov <alexei.starovoitov@gmail.com>,
	maze@google.com, lmb@cloudflare.com, shaun@tigera.io,
	Lorenzo Bianconi <lorenzo@kernel.org>,
	marek@cloudflare.com, John Fastabend <john.fastabend@gmail.com>,
	eyal.birger@gmail.com
Subject: Re: [PATCH bpf-next V3 0/6] bpf: New approach for BPF MTU handling
Date: Fri, 9 Oct 2020 09:33:19 -0700	[thread overview]
Message-ID: <20201009093319.6140b322@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com> (raw)
In-Reply-To: <160216609656.882446.16642490462568561112.stgit@firesoul>

On Thu, 08 Oct 2020 16:08:57 +0200 Jesper Dangaard Brouer wrote:
> V3: Drop enforcement of MTU in net-core, leave it to drivers

Sorry for being late to the discussion.

I absolutely disagree. We had cases in the past where HW would lock up
if it was sent a frame with bad geometry.

We will not be sprinkling validation checks across the drivers because
some reconfiguration path may occasionally yield a bad packet, or it's
hard to do something right with BPF.

  parent reply	other threads:[~2020-10-09 16:33 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-08 14:08 [PATCH bpf-next V3 0/6] bpf: New approach for BPF MTU handling Jesper Dangaard Brouer
2020-10-08 14:09 ` [PATCH bpf-next V3 1/6] bpf: Remove MTU check in __bpf_skb_max_len Jesper Dangaard Brouer
2020-10-09 16:12   ` Daniel Borkmann
2020-10-09 18:26     ` Maciej Żenczykowski
2020-10-10 10:25     ` Jesper Dangaard Brouer
2020-10-08 14:09 ` [PATCH bpf-next V3 2/6] bpf: bpf_fib_lookup return MTU value as output when looked up Jesper Dangaard Brouer
2020-10-09  4:05   ` David Ahern
2020-10-08 14:09 ` [PATCH bpf-next V3 3/6] bpf: add BPF-helper for MTU checking Jesper Dangaard Brouer
2020-10-09 23:29   ` Maciej Żenczykowski
2020-10-21 11:32     ` Jesper Dangaard Brouer
2020-10-12 15:54   ` Lorenz Bauer
2020-10-08 14:09 ` [PATCH bpf-next V3 4/6] bpf: make it possible to identify BPF redirected SKBs Jesper Dangaard Brouer
2020-10-09 16:47   ` Daniel Borkmann
2020-10-09 18:33     ` Maciej Żenczykowski
2020-10-10 11:09       ` Jesper Dangaard Brouer
2020-10-12 21:04         ` Maciej Żenczykowski
2020-10-08 14:09 ` [PATCH bpf-next V3 5/6] bpf: drop MTU check when doing TC-BPF redirect to ingress Jesper Dangaard Brouer
2020-10-09 23:17   ` Maciej Żenczykowski
2020-10-08 14:09 ` [PATCH bpf-next V3 6/6] net: inline and splitup is_skb_forwardable Jesper Dangaard Brouer
2020-10-09 16:33 ` Jakub Kicinski [this message]
2020-10-09 20:49   ` [PATCH bpf-next V3 0/6] bpf: New approach for BPF MTU handling John Fastabend
2020-10-09 21:07     ` Alexei Starovoitov
2020-10-09 21:57       ` Maciej Żenczykowski
2020-10-09 23:00     ` Jakub Kicinski
2020-10-10 10:44       ` Jesper Dangaard Brouer
2020-10-10 16:32         ` Jakub Kicinski
2020-10-10 23:52           ` John Fastabend
2020-10-11 23:30             ` Jakub Kicinski
2020-10-13 20:40           ` Jesper Dangaard Brouer
2020-10-13 23:07             ` Jakub Kicinski
2020-10-13 23:37               ` Alexei Starovoitov
2020-10-13 23:54                 ` Maciej Żenczykowski

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