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From: Joe Stringer <joe@wand.net.nz>
To: bpf@vger.kernel.org
Cc: netdev@vger.kernel.org, daniel@iogearbox.net, ast@kernel.org,
	eric.dumazet@gmail.com, lmb@cloudflare.com, kafai@fb.com
Subject: [PATCHv2 bpf-next 2/5] bpf: Prefetch established socket destinations
Date: Tue, 24 Mar 2020 22:57:42 -0700	[thread overview]
Message-ID: <20200325055745.10710-3-joe@wand.net.nz> (raw)
In-Reply-To: <20200325055745.10710-1-joe@wand.net.nz>

Enhance the sk_assign logic to temporarily store the socket
receive destination, to save the route lookup later on. The dst
reference is kept alive by the caller's socket reference.

Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Joe Stringer <joe@wand.net.nz>
---
v2: Provide cookie to dst_check() for IPv6 case
v1: Initial version
---
 net/core/filter.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/net/core/filter.c b/net/core/filter.c
index f7f9b6631f75..0fada7fe9b75 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -5876,6 +5876,21 @@ BPF_CALL_3(bpf_sk_assign, struct sk_buff *, skb, struct sock *, sk, u64, flags)
 	skb_orphan(skb);
 	skb->sk = sk;
 	skb->destructor = sock_pfree;
+	if (sk_fullsock(sk)) {
+		struct dst_entry *dst = READ_ONCE(sk->sk_rx_dst);
+		u32 cookie = 0;
+
+#if IS_ENABLED(CONFIG_IPV6)
+		if (sk->sk_family == AF_INET6)
+			cookie = inet6_sk(sk)->rx_dst_cookie;
+#endif
+		if (dst)
+			dst = dst_check(dst, cookie);
+		if (dst) {
+			skb_dst_drop(skb);
+			skb_dst_set_noref(skb, dst);
+		}
+	}
 
 	return 0;
 }
-- 
2.20.1


  parent reply	other threads:[~2020-03-25  5:58 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-25  5:57 [PATCHv2 bpf-next 0/5] Add bpf_sk_assign eBPF helper Joe Stringer
2020-03-25  5:57 ` [PATCHv2 bpf-next 1/5] bpf: Add socket assign support Joe Stringer
2020-03-26  6:23   ` Martin KaFai Lau
2020-03-26  6:31     ` Joe Stringer
2020-03-26 10:24   ` Lorenz Bauer
2020-03-26 22:52     ` Joe Stringer
2020-03-27  2:40       ` Joe Stringer
2020-03-25  5:57 ` Joe Stringer [this message]
2020-03-26 21:11   ` [PATCHv2 bpf-next 2/5] bpf: Prefetch established socket destinations Alexei Starovoitov
2020-03-26 21:45     ` Joe Stringer
2020-03-25  5:57 ` [PATCHv2 bpf-next 3/5] net: Track socket refcounts in skb_steal_sock() Joe Stringer
2020-03-25  5:57 ` [PATCHv2 bpf-next 4/5] bpf: Don't refcount LISTEN sockets in sk_assign() Joe Stringer
2020-03-25 10:29   ` Lorenz Bauer
2020-03-25 20:46     ` Joe Stringer
2020-03-26 10:20       ` Lorenz Bauer
2020-03-26 21:37         ` Joe Stringer
2020-03-25  5:57 ` [PATCHv2 bpf-next 5/5] selftests: bpf: add test for sk_assign Joe Stringer
2020-03-25 10:35   ` Lorenz Bauer
2020-03-25 20:55     ` Joe Stringer
2020-03-26  6:25       ` Martin KaFai Lau
2020-03-26  6:38         ` Joe Stringer
2020-03-26 23:39           ` Joe Stringer
2020-03-25 18:17   ` Yonghong Song
2020-03-25 21:20     ` Joe Stringer
2020-03-25 22:00       ` Yonghong Song
2020-03-25 23:07         ` Joe Stringer
2020-03-26 10:13     ` Lorenz Bauer
2020-03-26 21:07       ` call for bpf progs. " Alexei Starovoitov
2020-03-26 23:14         ` Yonghong Song
2020-03-27 10:02         ` Lorenz Bauer
2020-03-27 16:08           ` Alexei Starovoitov
2020-03-27 19:06         ` Joe Stringer
2020-03-27 20:16           ` Daniel Borkmann
2020-03-27 22:24             ` Alexei Starovoitov
2020-03-28  0:17           ` Andrii Nakryiko
2020-03-26  2:04   ` Andrii Nakryiko
2020-03-26  2:16   ` Andrii Nakryiko
2020-03-26  5:28     ` Joe Stringer
2020-03-26  6:31       ` Martin KaFai Lau
2020-03-26 19:36       ` Andrii Nakryiko
2020-03-26 21:38         ` Joe Stringer

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