netdev - [PATCH bpf-next v2 09/13] selftests/bpf: move ip checksum helper to network helpers

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Message-Id: <20241114-flow_dissector-v2-9-ee4a3be3de65@bootlin.com>
Date: Thu, 14 Nov 2024 22:50:40 +0100
From: Alexis Lothoré (eBPF Foundation) <alexis.lothore@...tlin.com>
To: Andrii Nakryiko <andrii@...nel.org>, 
 Eduard Zingerman <eddyz87@...il.com>, Mykola Lysenko <mykolal@...com>, 
 Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
 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@...ichev.me>, Hao Luo <haoluo@...gle.com>, 
 Jiri Olsa <jolsa@...nel.org>, Shuah Khan <shuah@...nel.org>, 
 "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
 Jesper Dangaard Brouer <hawk@...nel.org>
Cc: ebpf@...uxfoundation.org, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 Bastien Curutchet <bastien.curutchet@...tlin.com>, bpf@...r.kernel.org, 
 linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org, 
 netdev@...r.kernel.org, 
 Alexis Lothoré (eBPF Foundation) <alexis.lothore@...tlin.com>
Subject: [PATCH bpf-next v2 09/13] selftests/bpf: move ip checksum helper
 to network helpers

xdp_metadata test has a small helper computing ipv checksums to allow
manually building packets.

Move this helper to network_helpers to share it with other tests.

Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@...tlin.com>
---
Changes in v2:
- new patch
---
 tools/testing/selftests/bpf/network_helpers.h      | 23 ++++++++++++++++++++++
 .../selftests/bpf/prog_tests/xdp_metadata.c        | 19 +-----------------
 2 files changed, 24 insertions(+), 18 deletions(-)

diff --git a/tools/testing/selftests/bpf/network_helpers.h b/tools/testing/selftests/bpf/network_helpers.h
index c72c16e1aff825439896b38e59962ffafe92dc71..c9b72960c651ab9fb249f6eb9e153b8416b7a488 100644
--- a/tools/testing/selftests/bpf/network_helpers.h
+++ b/tools/testing/selftests/bpf/network_helpers.h
@@ -104,6 +104,29 @@ static __u16 csum_fold(__u32 csum)
 	return (__u16)~csum;
 }

+static unsigned long add_csum_hword(const __u16 *start, int num_u16)
+{
+	unsigned long sum = 0;
+	int i;
+
+	for (i = 0; i < num_u16; i++)
+		sum += start[i];
+
+	return sum;
+}
+
+static inline __sum16 build_ip_csum(struct iphdr *iph)
+{
+	__u32 sum = 0;
+	__u16 *p;
+
+	iph->check = 0;
+	p = (void *)iph;
+	sum = add_csum_hword(p, iph->ihl << 1);
+
+	return csum_fold(sum);
+}
+
 static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
 					__u32 len, __u8 proto,
 					__wsum csum)
diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
index c87ee2bf558c1a7fb726cae0aa7b3d3735fb1aac..7f8e161655336127e5bd7a573d1a09db85a92f53 100644
--- a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
+++ b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
@@ -133,23 +133,6 @@ static void close_xsk(struct xsk *xsk)
 	munmap(xsk->umem_area, UMEM_SIZE);
 }

-static void ip_csum(struct iphdr *iph)
-{
-	__u32 sum = 0;
-	__u16 *p;
-	int i;
-
-	iph->check = 0;
-	p = (void *)iph;
-	for (i = 0; i < sizeof(*iph) / sizeof(*p); i++)
-		sum += p[i];
-
-	while (sum >> 16)
-		sum = (sum & 0xffff) + (sum >> 16);
-
-	iph->check = ~sum;
-}
-
 static int generate_packet(struct xsk *xsk, __u16 dst_port)
 {
 	struct xsk_tx_metadata *meta;
@@ -192,7 +175,7 @@ static int generate_packet(struct xsk *xsk, __u16 dst_port)
 	iph->protocol = IPPROTO_UDP;
 	ASSERT_EQ(inet_pton(FAMILY, TX_ADDR, &iph->saddr), 1, "inet_pton(TX_ADDR)");
 	ASSERT_EQ(inet_pton(FAMILY, RX_ADDR, &iph->daddr), 1, "inet_pton(RX_ADDR)");
-	ip_csum(iph);
+	iph->check = build_ip_csum(iph);

 	udph->source = htons(UDP_SOURCE_PORT);
 	udph->dest = htons(dst_port);

-- 
2.47.0