From: Muhammad Falak R Wani <falakreyaz@gmail.com>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>
Cc: bpf@vger.kernel.org, netdev@vger.kernel.org,
KP Singh <kpsingh@kernel.org>, Yonghong Song <yhs@fb.com>,
Song Liu <songliubraving@fb.com>, Martin KaFai Lau <kafai@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
Jesper Dangaard Brouer <hawk@kernel.org>,
Jakub Kicinski <kuba@kernel.org>,
"David S . Miller" <davem@davemloft.net>,
linux-kernel@vger.kernel.org,
Muhammad Falak R Wani <falakreyaz@gmail.com>
Subject: [PATCH] samples: bpf: add an explict comment to handle nested vlan tagging.
Date: Mon, 9 Aug 2021 12:30:46 +0530 [thread overview]
Message-ID: <20210809070046.32142-1-falakreyaz@gmail.com> (raw)
A codeblock for handling nested vlan trips newbies into thinking it as
duplicate code. Explicitly add a comment to clarify.
Signed-off-by: Muhammad Falak R Wani <falakreyaz@gmail.com>
---
samples/bpf/xdp1_kern.c | 2 ++
samples/bpf/xdp2_kern.c | 2 ++
2 files changed, 4 insertions(+)
diff --git a/samples/bpf/xdp1_kern.c b/samples/bpf/xdp1_kern.c
index 34b64394ed9c..f0c5d95084de 100644
--- a/samples/bpf/xdp1_kern.c
+++ b/samples/bpf/xdp1_kern.c
@@ -57,6 +57,7 @@ int xdp_prog1(struct xdp_md *ctx)
h_proto = eth->h_proto;
+ /* Handle VLAN tagged packet */
if (h_proto == htons(ETH_P_8021Q) || h_proto == htons(ETH_P_8021AD)) {
struct vlan_hdr *vhdr;
@@ -66,6 +67,7 @@ int xdp_prog1(struct xdp_md *ctx)
return rc;
h_proto = vhdr->h_vlan_encapsulated_proto;
}
+ /* Handle double VLAN tagged packet */
if (h_proto == htons(ETH_P_8021Q) || h_proto == htons(ETH_P_8021AD)) {
struct vlan_hdr *vhdr;
diff --git a/samples/bpf/xdp2_kern.c b/samples/bpf/xdp2_kern.c
index c787f4b49646..d8a64ab077b0 100644
--- a/samples/bpf/xdp2_kern.c
+++ b/samples/bpf/xdp2_kern.c
@@ -73,6 +73,7 @@ int xdp_prog1(struct xdp_md *ctx)
h_proto = eth->h_proto;
+ /* Handle VLAN tagged packet */
if (h_proto == htons(ETH_P_8021Q) || h_proto == htons(ETH_P_8021AD)) {
struct vlan_hdr *vhdr;
@@ -82,6 +83,7 @@ int xdp_prog1(struct xdp_md *ctx)
return rc;
h_proto = vhdr->h_vlan_encapsulated_proto;
}
+ /* Handle double VLAN tagged packet */
if (h_proto == htons(ETH_P_8021Q) || h_proto == htons(ETH_P_8021AD)) {
struct vlan_hdr *vhdr;
--
2.17.1
next reply other threads:[~2021-08-09 7:01 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-09 7:00 Muhammad Falak R Wani [this message]
2021-08-10 9:20 ` [PATCH] samples: bpf: add an explict comment to handle nested vlan tagging patchwork-bot+netdevbpf
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