linux-kernel - [PATCH RFC bpf-next 39/52] net, xdp: make &xdp_attachment

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Date:   Tue, 28 Jun 2022 21:47:59 +0200
From:   Alexander Lobakin <alexandr.lobakin@...el.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>
Cc:     Alexander Lobakin <alexandr.lobakin@...el.com>,
        Larysa Zaremba <larysa.zaremba@...el.com>,
        Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Björn Töpel <bjorn@...nel.org>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Toke Hoiland-Jorgensen <toke@...hat.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        John Fastabend <john.fastabend@...il.com>,
        Yajun Deng <yajun.deng@...ux.dev>,
        Willem de Bruijn <willemb@...gle.com>, bpf@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        xdp-hints@...-project.net
Subject: [PATCH RFC bpf-next 39/52] net, xdp: make &xdp_attachment_info a bit more useful in drivers

Add a new field which will store an arbitrary 'driver cookie', the
closest usage is to store enum there corresponding to the metadata
types supported by a driver to shortcut them on hotpath.
In fact, it's just reusing the 4-byte padding at the end.
Also, make it possible to store BTF ID in LE rather than CPU
byteorder, so that drivers could save some cycles on [potential]
byteswapping on hotpath.

Signed-off-by: Alexander Lobakin <alexandr.lobakin@...el.com>
---
 include/net/xdp.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/net/xdp.h b/include/net/xdp.h
index d1fd809655be..5762ce18885f 100644
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -380,8 +380,12 @@ void xdp_unreg_mem_model(struct xdp_mem_info *mem);
 
 struct xdp_attachment_info {
 	struct bpf_prog *prog;
-	u64 btf_id;
+	union {
+		__le64 btf_id_le;
+		u64 btf_id;
+	};
 	u32 meta_thresh;
+	u32 drv_cookie;
 };
 
 struct netdev_bpf;
-- 
2.36.1