From: Jakub Kicinski <kuba@kernel.org>
To: Lorenzo Bianconi <lorenzo@kernel.org>
Cc: Jesper Dangaard Brouer <hawk@kernel.org>,
Stanislav Fomichev <stfomichev@gmail.com>,
bpf@vger.kernel.org, netdev@vger.kernel.org,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <borkmann@iogearbox.net>,
Eric Dumazet <eric.dumazet@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
Paolo Abeni <pabeni@redhat.com>,
sdf@fomichev.me, kernel-team@cloudflare.com,
arthur@arthurfabre.com, jakub@cloudflare.com,
Jesse Brandeburg <jbrandeburg@cloudflare.com>
Subject: Re: [PATCH bpf-next V2 0/7] xdp: Allow BPF to set RX hints for XDP_REDIRECTed packets
Date: Tue, 5 Aug 2025 16:54:14 -0700 [thread overview]
Message-ID: <20250805165414.032db0b1@kernel.org> (raw)
In-Reply-To: <aJIEvK0CU_BqqgPQ@lore-rh-laptop>
On Tue, 5 Aug 2025 15:18:52 +0200 Lorenzo Bianconi wrote:
> > I was thinking of doing the SET on the veth side. Basically the
> > metadata has to be understood by the stack only at the xdp->skb
> > transition point. So we can delay the SET until that moment, carrying
> > the information in program-specific format.
>
> ack, I am fine to delay the translation of the HW metadata from a HW
> specific format (the one contained in the DMA descriptor) to the network one
> when they are consumed to create the SKB (the veth driver in this case) but I
> guess we need to copy the info contained in the DMA descriptor into a buffer
> that is still valid when veth driver consumes them since the DMA descriptor
> can be no longer available at that time. Do you agree or am I missing
> something?
That's right, we need to carry the metadata we need with the packet
(in an XDP program-specific md prepend, presumably).
next prev parent reply other threads:[~2025-08-05 23:54 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-02 14:58 [PATCH bpf-next V2 0/7] xdp: Allow BPF to set RX hints for XDP_REDIRECTed packets Jesper Dangaard Brouer
2025-07-02 14:58 ` [PATCH bpf-next V2 1/7] net: xdp: Add xdp_rx_meta structure Jesper Dangaard Brouer
2025-07-17 9:19 ` Jakub Sitnicki
2025-07-17 14:40 ` Jesper Dangaard Brouer
2025-07-18 10:33 ` Jakub Sitnicki
2025-07-02 14:58 ` [PATCH bpf-next V2 2/7] selftests/bpf: Adjust test for maximum packet size in xdp_do_redirect Jesper Dangaard Brouer
2025-07-02 14:58 ` [PATCH bpf-next V2 3/7] net: xdp: Add kfuncs to store hw metadata in xdp_buff Jesper Dangaard Brouer
2025-07-03 11:41 ` Jesper Dangaard Brouer
2025-07-03 12:26 ` Lorenzo Bianconi
2025-07-02 14:58 ` [PATCH bpf-next V2 4/7] net: xdp: Set skb hw metadata from xdp_frame Jesper Dangaard Brouer
2025-07-02 14:58 ` [PATCH bpf-next V2 5/7] net: veth: Read xdp metadata from rx_meta struct if available Jesper Dangaard Brouer
2025-07-17 12:11 ` Jakub Sitnicki
2025-07-02 14:58 ` [PATCH bpf-next V2 6/7] bpf: selftests: Add rx_meta store kfuncs selftest Jesper Dangaard Brouer
2025-07-23 9:24 ` Bouska, Zdenek
2025-07-02 14:58 ` [PATCH bpf-next V2 7/7] net: xdp: update documentation for xdp-rx-metadata.rst Jesper Dangaard Brouer
2025-07-02 16:05 ` [PATCH bpf-next V2 0/7] xdp: Allow BPF to set RX hints for XDP_REDIRECTed packets Stanislav Fomichev
2025-07-03 11:17 ` Jesper Dangaard Brouer
2025-07-07 14:40 ` Stanislav Fomichev
2025-07-09 9:31 ` Lorenzo Bianconi
2025-07-11 16:04 ` Stanislav Fomichev
2025-07-16 11:17 ` Lorenzo Bianconi
2025-07-16 21:20 ` Jakub Kicinski
2025-07-17 13:08 ` Jesper Dangaard Brouer
2025-07-18 1:25 ` Jakub Kicinski
2025-07-18 10:56 ` Jesper Dangaard Brouer
2025-07-22 1:13 ` Jakub Kicinski
2025-07-28 10:53 ` Lorenzo Bianconi
2025-07-28 16:29 ` Jakub Kicinski
2025-07-29 11:15 ` Jesper Dangaard Brouer
2025-07-29 19:47 ` Martin KaFai Lau
2025-07-31 16:27 ` Jesper Dangaard Brouer
2025-08-01 20:38 ` Jakub Kicinski
2025-08-04 13:18 ` Jesper Dangaard Brouer
2025-08-06 0:28 ` Jakub Kicinski
2025-08-07 18:26 ` Jesper Dangaard Brouer
2025-08-06 1:24 ` Martin KaFai Lau
2025-08-07 19:07 ` Jesper Dangaard Brouer
2025-08-13 2:59 ` Martin KaFai Lau
2025-07-31 21:18 ` Lorenzo Bianconi
2025-08-01 20:40 ` Jakub Kicinski
2025-08-05 13:18 ` Lorenzo Bianconi
2025-08-05 23:54 ` Jakub Kicinski [this message]
2025-07-18 9:55 ` Lorenzo Bianconi
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