netdev - [PATCHv3 bpf 2/2] bpf: Improve socket lookup reuseport documentation

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Date:   Fri, 30 Nov 2018 15:32:21 -0800
From:   Joe Stringer <joe@...d.net.nz>
To:     daniel@...earbox.net, ast@...nel.org
Cc:     netdev@...r.kernel.org, dsahern@...il.com,
        nicolas.dichtel@...nd.com
Subject: [PATCHv3 bpf 2/2] bpf: Improve socket lookup reuseport documentation

Improve the wording around socket lookup for reuseport sockets, and
ensure that both bpf.h headers are in sync.

Signed-off-by: Joe Stringer <joe@...d.net.nz>
---
 include/uapi/linux/bpf.h       | 4 ++++
 tools/include/uapi/linux/bpf.h | 8 ++++----
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index ad68b472dad2..47f620b5cc5c 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -2203,6 +2203,8 @@ union bpf_attr {
  *		**CONFIG_NET** configuration option.
  *	Return
  *		Pointer to *struct bpf_sock*, or NULL in case of failure.
+ *		For sockets with reuseport option, the *struct bpf_sock*
+ *		result is from reuse->socks[] using the hash of the tuple.
  *
  * struct bpf_sock *bpf_sk_lookup_udp(void *ctx, struct bpf_sock_tuple *tuple, u32 tuple_size, u64 netns, u64 flags)
  *	Description
@@ -2237,6 +2239,8 @@ union bpf_attr {
  *		**CONFIG_NET** configuration option.
  *	Return
  *		Pointer to *struct bpf_sock*, or NULL in case of failure.
+ *		For sockets with reuseport option, the *struct bpf_sock*
+ *		result is from reuse->socks[] using the hash of the tuple.
  *
  * int bpf_sk_release(struct bpf_sock *sk)
  *	Description
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index de2072ef475b..47f620b5cc5c 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -2203,8 +2203,8 @@ union bpf_attr {
  *		**CONFIG_NET** configuration option.
  *	Return
  *		Pointer to *struct bpf_sock*, or NULL in case of failure.
- *		For sockets with reuseport option, *struct bpf_sock*
- *		return is from reuse->socks[] using hash of the packet.
+ *		For sockets with reuseport option, the *struct bpf_sock*
+ *		result is from reuse->socks[] using the hash of the tuple.
  *
  * struct bpf_sock *bpf_sk_lookup_udp(void *ctx, struct bpf_sock_tuple *tuple, u32 tuple_size, u64 netns, u64 flags)
  *	Description
@@ -2239,8 +2239,8 @@ union bpf_attr {
  *		**CONFIG_NET** configuration option.
  *	Return
  *		Pointer to *struct bpf_sock*, or NULL in case of failure.
- *		For sockets with reuseport option, *struct bpf_sock*
- *		return is from reuse->socks[] using hash of the packet.
+ *		For sockets with reuseport option, the *struct bpf_sock*
+ *		result is from reuse->socks[] using the hash of the tuple.
  *
  * int bpf_sk_release(struct bpf_sock *sk)
  *	Description
-- 
2.19.1