linux-kernel - [PATCH bpf-next] bpf: Allow to use kfunc XDP hints and frags together

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Message-ID: <20230914083716.57443-1-larysa.zaremba@intel.com>
Date:   Thu, 14 Sep 2023 10:37:11 +0200
From:   Larysa Zaremba <larysa.zaremba@...el.com>
To:     bpf@...r.kernel.org
Cc:     Larysa Zaremba <larysa.zaremba@...el.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>,
        Yonghong Song <yonghong.song@...ux.dev>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH bpf-next] bpf: Allow to use kfunc XDP hints and frags together

There is no fundamental reason, why multi-buffer XDP and XDP kfunc RX hints
cannot coexist in a single program.

Allow those features to be used together by modifying the flags conditions.

Suggested-by: Stanislav Fomichev <sdf@...gle.com>
Link: https://lore.kernel.org/bpf/CAKH8qBuzgtJj=OKMdsxEkyML36VsAuZpcrsXcyqjdKXSJCBq=Q@mail.gmail.com/
Signed-off-by: Larysa Zaremba <larysa.zaremba@...el.com>
---
 kernel/bpf/offload.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/kernel/bpf/offload.c b/kernel/bpf/offload.c
index ee35f33a96d1..43aded96c79b 100644
--- a/kernel/bpf/offload.c
+++ b/kernel/bpf/offload.c
@@ -232,7 +232,11 @@ int bpf_prog_dev_bound_init(struct bpf_prog *prog, union bpf_attr *attr)
 	    attr->prog_type != BPF_PROG_TYPE_XDP)
 		return -EINVAL;
 
-	if (attr->prog_flags & ~BPF_F_XDP_DEV_BOUND_ONLY)
+	if (attr->prog_flags & ~(BPF_F_XDP_DEV_BOUND_ONLY | BPF_F_XDP_HAS_FRAGS))
+		return -EINVAL;
+
+	if (attr->prog_flags & BPF_F_XDP_HAS_FRAGS &&
+	    !(attr->prog_flags & BPF_F_XDP_DEV_BOUND_ONLY))
 		return -EINVAL;
 
 	if (attr->prog_type == BPF_PROG_TYPE_SCHED_CLS &&
-- 
2.41.0