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[src/trunk]: src/sys/arch/xen/xen xennetback(4): Fix membars in xennetback_rx...
details: https://anonhg.NetBSD.org/src/rev/0c0b4f9cf490
branches: trunk
changeset: 373720:0c0b4f9cf490
user: riastradh <riastradh%NetBSD.org@localhost>
date: Sat Feb 25 00:34:25 2023 +0000
description:
xennetback(4): Fix membars in xennetback_rx_copy_process.
- No need for barrier around touching req_cons and rsp_prod_pvt,
which are private.
- RING_PUSH_RESPONSES_AND_CHECK_NOTIFY already issues xen_wmb, no
need to add one explicitly.
- After pushing responses, must issue xen_wmb (not xen_rmb) before
hypervisor_notify_via_evtchn.
diffstat:
sys/arch/xen/xen/xennetback_xenbus.c | 7 +++----
1 files changed, 3 insertions(+), 4 deletions(-)
diffs (34 lines):
diff -r 9987aaf6694a -r 0c0b4f9cf490 sys/arch/xen/xen/xennetback_xenbus.c
--- a/sys/arch/xen/xen/xennetback_xenbus.c Sat Feb 25 00:34:13 2023 +0000
+++ b/sys/arch/xen/xen/xennetback_xenbus.c Sat Feb 25 00:34:25 2023 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: xennetback_xenbus.c,v 1.109 2023/02/25 00:34:13 riastradh Exp $ */
+/* $NetBSD: xennetback_xenbus.c,v 1.110 2023/02/25 00:34:25 riastradh Exp $ */
/*
* Copyright (c) 2006 Manuel Bouyer.
@@ -25,7 +25,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: xennetback_xenbus.c,v 1.109 2023/02/25 00:34:13 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: xennetback_xenbus.c,v 1.110 2023/02/25 00:34:25 riastradh Exp $");
#include <sys/types.h>
#include <sys/param.h>
@@ -1022,14 +1022,13 @@
}
/* update pointer */
- xen_rmb();
xneti->xni_rxring.req_cons += queued;
xneti->xni_rxring.rsp_prod_pvt += queued;
RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&xneti->xni_rxring, notify);
/* send event */
if (notify) {
- xen_rmb();
+ xen_wmb();
XENPRINTF(("%s receive event\n",
xneti->xni_if.if_xname));
hypervisor_notify_via_evtchn(xneti->xni_evtchn);
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