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Date:   Fri, 24 Jul 2020 22:54:57 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     netdev@...r.kernel.org
Cc:     bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        jakub@...udflare.com, kuniyu@...zon.co.jp, davem@...emloft.net,
        kuba@...nel.org, Willem de Bruijn <willemb@...gle.com>
Subject: [PATCH bpf-next] udp: reduce merge conflict on udp[46]_lib_lookup2

From: Willem de Bruijn <willemb@...gle.com>

Commit efc6b6f6c311 ("udp: Improve load balancing for SO_REUSEPORT.")

in net conflicts with

Commit 72f7e9440e9b ("udp: Run SK_LOOKUP BPF program on socket lookup")

in bpf-next.

Commit 4a0e87bb1836 ("udp: Don't discard reuseport selection when group
has connections")

also in bpf-next reduces the conflict.

Further simplify by applying the main change of the first commit to
bpf-next. After this a conflict remains, but the bpf-next side can be
taken as is.

Now unused variable reuseport_result added in net must also be
removed. That applies without a conflict, so is harder to spot.

Link: http://patchwork.ozlabs.org/project/netdev/patch/20200722165227.51046-1-kuniyu@amazon.co.jp/
Signed-off-by: Willem de Bruijn <willemb@...gle.com>
---
 net/ipv4/udp.c | 3 ++-
 net/ipv6/udp.c | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 9397690b3737..67f8e880d7f3 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -448,7 +448,8 @@ static struct sock *udp4_lib_lookup2(struct net *net,
 				return result;
 
 			badness = score;
-			result = sk;
+			if (!result)
+				result = sk;
 		}
 	}
 	return result;
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index ed282b0fe8ac..827a01b50b9b 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -180,8 +180,9 @@ static struct sock *udp6_lib_lookup2(struct net *net,
 			if (result && !reuseport_has_conns(sk, false))
 				return result;
 
-			result = sk;
 			badness = score;
+			if (!result)
+				result = sk;
 		}
 	}
 	return result;
-- 
2.28.0.rc0.142.g3c755180ce-goog

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