netdev - [PATCH net-next 23/27] udp/ipv6: optimise out daddr reassignment

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Message-Id: <24a4aec56b6a94c1d54a0e81bc0af6efd29fd622.1648981571.git.asml.silence@gmail.com>
Date:   Sun,  3 Apr 2022 14:06:35 +0100
From:   Pavel Begunkov <asml.silence@...il.com>
To:     netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Eric Dumazet <edumazet@...gle.com>, Wei Liu <wei.liu@...nel.org>,
        Paul Durrant <paul@....org>,
        Pavel Begunkov <asml.silence@...il.com>
Subject: [PATCH net-next 23/27] udp/ipv6: optimise out daddr reassignment

There is nothing that checks daddr placement in udpv6_sendmsg(), so the
check reassigning it to ->sk_v6_daddr looks like a not needed anymore
artifact from the past. Remove it.

Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
---
 net/ipv6/udp.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index cbb11316a526..2b5a3ed3f138 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1417,14 +1417,6 @@ int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 			}
 		}
 
-		/*
-		 * Otherwise it will be difficult to maintain
-		 * sk->sk_dst_cache.
-		 */
-		if (sk->sk_state == TCP_ESTABLISHED &&
-		    ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
-			daddr = &sk->sk_v6_daddr;
-
 		if (addr_len >= sizeof(struct sockaddr_in6) &&
 		    sin6->sin6_scope_id &&
 		    __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
-- 
2.35.1