udp: Avoid call to compute_score on multiple sites

We've observed a 7-12% performance regression in iperf3 UDP ipv4 and
ipv6 tests with multiple sockets on Zen3 cpus, which we traced back to
commit f0ea27e7bfe1 ("udp: re-score reuseport groups when connected
sockets are present").  The failing tests were those that would spawn
UDP sockets per-cpu on systems that have a high number of cpus.

Unsurprisingly, it is not caused by the extra re-scoring of the reused
socket, but due to the compiler no longer inlining compute_score, once
it has the extra call site in udp4_lib_lookup2.  This is augmented by
the "Safe RET" mitigation for SRSO, needed in our Zen3 cpus.

We could just explicitly inline it, but compute_score() is quite a large
function, around 300b.  Inlining in two sites would almost double
udp4_lib_lookup2, which is a silly thing to do just to workaround a
mitigation.  Instead, this patch shuffles the code a bit to avoid the
multiple calls to compute_score.  Since it is a static function used in
one spot, the compiler can safely fold it in, as it did before, without
increasing the text size.

With this patch applied I ran my original iperf3 testcases.  The failing
cases all looked like this (ipv4):
	iperf3 -c 127.0.0.1 --udp -4 -f K -b $R -l 8920 -t 30 -i 5 -P 64 -O 2

where $R is either 1G/10G/0 (max, unlimited).  I ran 3 times each.
baseline is v6.9-rc3. harmean == harmonic mean; CV == coefficient of
variation.

ipv4:
                 1G                10G                  MAX
	    HARMEAN  (CV)      HARMEAN  (CV)    HARMEAN     (CV)
baseline 1743852.66(0.0208) 1725933.02(0.0167) 1705203.78(0.0386)
patched  1968727.61(0.0035) 1962283.22(0.0195) 1923853.50(0.0256)

ipv6:
                 1G                10G                  MAX
	    HARMEAN  (CV)      HARMEAN  (CV)    HARMEAN     (CV)
baseline 1729020.03(0.0028) 1691704.49(0.0243) 1692251.34(0.0083)
patched  1900422.19(0.0067) 1900968.01(0.0067) 1568532.72(0.1519)

This restores the performance we had before the change above with this
benchmark.  We obviously don't expect any real impact when mitigations
are disabled, but just to be sure it also doesn't regresses:

mitigations=off ipv4:
                 1G                10G                  MAX
	    HARMEAN  (CV)      HARMEAN  (CV)    HARMEAN     (CV)
baseline 3230279.97(0.0066) 3229320.91(0.0060) 2605693.19(0.0697)
patched  3242802.36(0.0073) 3239310.71(0.0035) 2502427.19(0.0882)

Cc: Lorenz Bauer <lmb@isovalent.com>
Fixes: f0ea27e7bfe1 ("udp: re-score reuseport groups when connected sockets are present")
Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 16 insertions, 4 deletions

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index a9466f881f1b..9914e73f4785 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -169,15 +169,21 @@ static struct sock *udp6_lib_lookup2(struct net *net,
 {
 	struct sock *sk, *result;
 	int score, badness;
+	bool need_rescore;
 
 	result = NULL;
 	badness = -1;
 	udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
-		score = compute_score(sk, net, saddr, sport,
-				      daddr, hnum, dif, sdif);
+		need_rescore = false;
+rescore:
+		score = compute_score(need_rescore ? result : sk, net, saddr,
+				      sport, daddr, hnum, dif, sdif);
 		if (score > badness) {
 			badness = score;
 
+			if (need_rescore)
+				continue;
+
 			if (sk->sk_state == TCP_ESTABLISHED) {
 				result = sk;
 				continue;
@@ -198,8 +204,14 @@ static struct sock *udp6_lib_lookup2(struct net *net,
 			if (IS_ERR(result))
 				continue;
 
-			badness = compute_score(sk, net, saddr, sport,
-						daddr, hnum, dif, sdif);
+			/* compute_score is too long of a function to be
+			 * inlined, and calling it again here yields
+			 * measureable overhead for some
+			 * workloads. Work around it by jumping
+			 * backwards to rescore 'result'.
+			 */
+			need_rescore = true;
+			goto rescore;
 		}
 	}
 	return result;