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[src/trunk]: src/sys/net Ifdef out fast path that relies on atomic 64-bit loa...
details: https://anonhg.NetBSD.org/src/rev/b05ee743f846
branches: trunk
changeset: 975091:b05ee743f846
user: riastradh <riastradh%NetBSD.org@localhost>
date: Fri Aug 21 07:05:25 2020 +0000
description:
Ifdef out fast path that relies on atomic 64-bit load/store.
(Really this sliding window business could probably be done with
32-bit sequence numbers and careful detection of wraparound, but
that's a little more effort to work out -- let's just unbreak the
builds for now.)
diffstat:
sys/net/if_wg.c | 10 ++++++++--
1 files changed, 8 insertions(+), 2 deletions(-)
diffs (41 lines):
diff -r 4d41f456a7ef -r b05ee743f846 sys/net/if_wg.c
--- a/sys/net/if_wg.c Fri Aug 21 07:04:31 2020 +0000
+++ b/sys/net/if_wg.c Fri Aug 21 07:05:25 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: if_wg.c,v 1.19 2020/08/20 21:36:21 riastradh Exp $ */
+/* $NetBSD: if_wg.c,v 1.20 2020/08/21 07:05:25 riastradh Exp $ */
/*
* Copyright (C) Ryota Ozaki <ozaki.ryota%gmail.com@localhost>
@@ -43,7 +43,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_wg.c,v 1.19 2020/08/20 21:36:21 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_wg.c,v 1.20 2020/08/21 07:05:25 riastradh Exp $");
#ifdef _KERNEL_OPT
#include "opt_inet.h"
@@ -372,8 +372,10 @@
* If it's more than one window older than the highest sequence
* number we've seen, reject.
*/
+#ifdef __HAVE_ATOMIC64_LOADSTORE
if (S + SLIWIN_NPKT < atomic_load_relaxed(&W->T))
return EAUTH;
+#endif
/*
* Otherwise, we need to take the lock to decide, so don't
@@ -406,7 +408,11 @@
for (k = 0; k < MIN(j - i, SLIWIN_WORDS); k++)
W->B[(i + k + 1) % SLIWIN_WORDS] = 0;
+#ifdef __HAVE_ATOMIC64_LOADSTORE
atomic_store_relaxed(&W->T, S);
+#else
+ W->T = S;
+#endif
}
/* Test and set the bit -- if already set, reject. */
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