From: Jakub Kicinski <kuba@kernel.org>
To: "Song, Yoong Siang" <yoong.siang.song@intel.com>
Cc: "David S . Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Paolo Abeni <pabeni@redhat.com>, Simon Horman <horms@kernel.org>,
Jonathan Corbet <corbet@lwn.net>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
"Jesper Dangaard Brouer" <hawk@kernel.org>,
John Fastabend <john.fastabend@gmail.com>,
Stanislav Fomichev <sdf@fomichev.me>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <martin.lau@linux.dev>,
Eduard Zingerman <eddyz87@gmail.com>, Song Liu <song@kernel.org>,
Yonghong Song <yonghong.song@linux.dev>,
KP Singh <kpsingh@kernel.org>, Hao Luo <haoluo@google.com>,
Jiri Olsa <jolsa@kernel.org>, Mykola Lysenko <mykolal@fb.com>,
Shuah Khan <shuah@kernel.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"bpf@vger.kernel.org" <bpf@vger.kernel.org>,
"linux-kselftest@vger.kernel.org"
<linux-kselftest@vger.kernel.org>
Subject: Re: [PATCH bpf-next 0/2] Clarify and Enhance XDP Rx Metadata Handling
Date: Mon, 7 Jul 2025 18:44:49 -0700 [thread overview]
Message-ID: <20250707184449.42736a0a@kernel.org> (raw)
In-Reply-To: <IA3PR11MB9254DC4B7984E014206A1FBFD84EA@IA3PR11MB9254.namprd11.prod.outlook.com>
On Tue, 8 Jul 2025 01:34:13 +0000 Song, Yoong Siang wrote:
> >For normal XDP my understanding is that its the driver's responsibility
> >to move the "reserved" stuff out of place before presenting the frame to
> >program.
>
> Is it means that driver needs to move out the "reserved" stuff before XDP program
> and then move back the stuff after XDP program for certain situation, like XDP_PASS?
Why would the driver need to move it back?
On XDP_PASS an skb is constructed, so the metadata should
be transferred to the skb. There is no need to copy it back
as a prepend.
next prev parent reply other threads:[~2025-07-08 1:44 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-01 4:29 [PATCH bpf-next 0/2] Clarify and Enhance XDP Rx Metadata Handling Song Yoong Siang
2025-07-01 4:29 ` [PATCH bpf-next 1/2] doc: clarify XDP Rx metadata layout and bpf_xdp_adjust_meta usage Song Yoong Siang
2025-07-01 4:29 ` [PATCH bpf-next 2/2] selftests/bpf: Enhance XDP Rx Metadata Handling Song Yoong Siang
2025-07-01 16:31 ` Stanislav Fomichev
2025-07-02 2:23 ` Song, Yoong Siang
2025-07-02 3:55 ` Song, Yoong Siang
2025-07-02 15:18 ` Stanislav Fomichev
2025-07-02 15:56 ` Song, Yoong Siang
2025-07-02 16:04 ` Stanislav Fomichev
2025-07-02 16:17 ` Song, Yoong Siang
2025-07-07 20:55 ` [PATCH bpf-next 0/2] Clarify and " Jakub Kicinski
2025-07-08 1:34 ` Song, Yoong Siang
2025-07-08 1:44 ` Jakub Kicinski [this message]
2025-07-08 2:06 ` Song, Yoong Siang
2025-07-08 2:17 ` Jakub Kicinski
2025-07-08 2:32 ` Song, Yoong Siang
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