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[bpf-next,v3,10/14] selftests/bpf: document pseudo-header checksum helpers

Message ID 20241120-flow_dissector-v3-10-45b46494f937@bootlin.com (mailing list archive)
State New
Delegated to: BPF
Headers show
Series selftests/bpf: migrate test_flow_dissector.sh to test_progs | expand

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netdev/check_selftest success No net selftest shell script
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Commit Message

Alexis Lothoré (eBPF Foundation) Nov. 20, 2024, 7:43 a.m. UTC 
network_helpers.h provides helpers to compute checksum for pseudo
headers but no helpers to compute the global checksums.

Before adding those, clarify csum_tcpudp_magic and csum_ipv6_magic
purpose by adding some documentation.

Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com>
---
Changes in v3:
- instead of renaming the helpers, keep the original name (which is in
  sync with kernel helpers), and rather add documentation

Changes in v2:
- new patch
---
 tools/testing/selftests/bpf/network_helpers.h | 30 +++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

Comments

Stanislav Fomichev Nov. 20, 2024, 3:55 p.m. UTC | #1 
On 11/20, Alexis Lothoré (eBPF Foundation) wrote:
> network_helpers.h provides helpers to compute checksum for pseudo
> headers but no helpers to compute the global checksums.
> 
> Before adding those, clarify csum_tcpudp_magic and csum_ipv6_magic
> purpose by adding some documentation.
> 
> Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com>

Acked-by: Stanislav Fomichev <sdf@fomichev.me>
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/network_helpers.h b/tools/testing/selftests/bpf/network_helpers.h
index 5ef909f766eb9ac2dd5be67b99245b4676ce4f5f..6ca636643ea2b77fb5cc459b03bf7f8c4f749377 100644
--- a/tools/testing/selftests/bpf/network_helpers.h
+++ b/tools/testing/selftests/bpf/network_helpers.h
@@ -128,6 +128,21 @@  static inline __sum16 build_ip_csum(struct iphdr *iph)
 	return csum_fold(sum);
 }
 
+/**
+ * csum_tcpudp_magic - compute IP pseudo-header checksum
+ *
+ * Compute the IPv4 pseudo header checksum. The helper can take a
+ * accumulated sum from the transport layer to accumulate it and directly
+ * return the transport layer
+ *
+ * @saddr: IP source address
+ * @daddr: IP dest address
+ * @len: IP data size
+ * @proto: transport layer protocol
+ * @csum: The accumulated partial sum to add to the computation
+ *
+ * Returns the folded sum
+ */
 static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
 					__u32 len, __u8 proto,
 					__wsum csum)
@@ -143,6 +158,21 @@  static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
 	return csum_fold((__u32)s);
 }
 
+/**
+ * csum_ipv6_magic - compute IPv6 pseudo-header checksum
+ *
+ * Compute the ipv6 pseudo header checksum. The helper can take a
+ * accumulated sum from the transport layer to accumulate it and directly
+ * return the transport layer
+ *
+ * @saddr: IPv6 source address
+ * @daddr: IPv6 dest address
+ * @len: IPv6 data size
+ * @proto: transport layer protocol
+ * @csum: The accumulated partial sum to add to the computation
+ *
+ * Returns the folded sum
+ */
 static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
 				      const struct in6_addr *daddr,
 					__u32 len, __u8 proto,