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From: Stanislav Fomichev <sdf@google.com>
To: bpf@vger.kernel.org
Cc: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
	martin.lau@linux.dev, song@kernel.org, yhs@fb.com,
	john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com,
	haoluo@google.com, jolsa@kernel.org, kuba@kernel.org,
	toke@kernel.org, willemb@google.com, dsahern@kernel.org,
	magnus.karlsson@intel.com, bjorn@kernel.org,
	maciej.fijalkowski@intel.com, hawk@kernel.org,
	yoong.siang.song@intel.com, netdev@vger.kernel.org,
	xdp-hints@xdp-project.net
Subject: [xdp-hints] [PATCH bpf-next v2 6/9] selftests/bpf: Add csum helpers
Date: Thu, 14 Sep 2023 14:04:49 -0700	[thread overview]
Message-ID: <20230914210452.2588884-7-sdf@google.com> (raw)
In-Reply-To: <20230914210452.2588884-1-sdf@google.com>

Checksum helpers will be used to calculate pseudo-header checksum in
AF_XDP metadata selftests.

The helpers are mirroring existing kernel ones:
- csum_tcpudp_magic : IPv4 pseudo header csum
- csum_ipv6_magic : IPv6 pseudo header csum
- csum_fold : fold csum and do one's complement

Signed-off-by: Stanislav Fomichev <sdf@google.com>
---
 tools/testing/selftests/bpf/network_helpers.h | 43 +++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/tools/testing/selftests/bpf/network_helpers.h b/tools/testing/selftests/bpf/network_helpers.h
index 5eccc67d1a99..654a854c9fb2 100644
--- a/tools/testing/selftests/bpf/network_helpers.h
+++ b/tools/testing/selftests/bpf/network_helpers.h
@@ -70,4 +70,47 @@ struct nstoken;
  */
 struct nstoken *open_netns(const char *name);
 void close_netns(struct nstoken *token);
+
+static __u16 csum_fold(__u32 csum)
+{
+	csum = (csum & 0xffff) + (csum >> 16);
+	csum = (csum & 0xffff) + (csum >> 16);
+
+	return (__u16)~csum;
+}
+
+static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
+					__u32 len, __u8 proto,
+					__wsum csum)
+{
+	__u64 s = csum;
+
+	s += (__u32)saddr;
+	s += (__u32)daddr;
+	s += htons(proto + len);
+	s = (s & 0xffffffff) + (s >> 32);
+	s = (s & 0xffffffff) + (s >> 32);
+
+	return csum_fold((__u32)s);
+}
+
+static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
+				      const struct in6_addr *daddr,
+					__u32 len, __u8 proto,
+					__wsum csum)
+{
+	__u64 s = csum;
+	int i;
+
+	for (i = 0; i < 4; i++)
+		s += (__u32)saddr->s6_addr32[i];
+	for (i = 0; i < 4; i++)
+		s += (__u32)daddr->s6_addr32[i];
+	s += htons(proto + len);
+	s = (s & 0xffffffff) + (s >> 32);
+	s = (s & 0xffffffff) + (s >> 32);
+
+	return csum_fold((__u32)s);
+}
+
 #endif
-- 
2.42.0.459.ge4e396fd5e-goog


  parent reply	other threads:[~2023-09-14 21:05 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-09-14 21:04 [xdp-hints] [PATCH bpf-next v2 0/9] xsk: TX metadata Stanislav Fomichev
2023-09-14 21:04 ` [xdp-hints] [PATCH bpf-next v2 1/9] xsk: Support tx_metadata_len Stanislav Fomichev
2023-09-14 21:04 ` [xdp-hints] [PATCH bpf-next v2 2/9] xsk: add TX timestamp and TX checksum offload support Stanislav Fomichev
2023-09-15  1:29   ` [xdp-hints] " kernel test robot
2023-09-15  1:30   ` Vinicius Costa Gomes
2023-09-15 16:25     ` Stanislav Fomichev
2023-09-15  9:44   ` kernel test robot
2023-09-14 21:04 ` [xdp-hints] [PATCH bpf-next v2 3/9] tools: ynl: print xsk-features from the sample Stanislav Fomichev
2023-09-14 21:04 ` [xdp-hints] [PATCH bpf-next v2 4/9] net/mlx5e: Implement AF_XDP TX timestamp and checksum offload Stanislav Fomichev
2023-09-15  2:44   ` [xdp-hints] " kernel test robot
2023-09-14 21:04 ` [xdp-hints] [PATCH bpf-next v2 5/9] selftests/xsk: Support tx_metadata_len Stanislav Fomichev
2023-09-14 21:04 ` Stanislav Fomichev [this message]
2023-09-14 21:04 ` [xdp-hints] [PATCH bpf-next v2 7/9] selftests/bpf: Add TX side to xdp_metadata Stanislav Fomichev
2023-09-14 21:04 ` [xdp-hints] [PATCH bpf-next v2 8/9] selftests/bpf: Add TX side to xdp_hw_metadata Stanislav Fomichev
2023-09-14 21:04 ` [xdp-hints] [PATCH bpf-next v2 9/9] xsk: document tx_metadata_len layout Stanislav Fomichev

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