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Create if_slowtimo (if_watchdog) callout for each interface 

This change is to obviate the need to run if_slowtimo callbacks that
may sleep inside IFNET_FOREACH. And also by this change we can turn
on MPSAFE of callouts individually.

Discussed with uebayasi@ and riastradh@.
This commit is contained in:
ozaki-r 2014-11-26 07:43:04 +00:00
parent c474a8e4a5
commit 3f6a7c52ac
2 changed files with 27 additions and 18 deletions
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39
sys/net/if.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: if.c,v 1.295 2014/11/26 07:22:05 ozaki-r Exp $ */
/* $NetBSD: if.c,v 1.296 2014/11/26 07:43:04 ozaki-r Exp $ */
/*-
* Copyright (c) 1999, 2000, 2001, 2008 The NetBSD Foundation, Inc.
@ -90,7 +90,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if.c,v 1.295 2014/11/26 07:22:05 ozaki-r Exp $");
__KERNEL_RCSID(0, "$NetBSD: if.c,v 1.296 2014/11/26 07:43:04 ozaki-r Exp $");
#include "opt_inet.h"
@ -168,8 +168,6 @@ static kmutex_t if_clone_mtx;
static struct ifaddr ** ifnet_addrs = NULL;
static callout_t if_slowtimo_ch;
struct ifnet *lo0ifp;
int ifqmaxlen = IFQ_MAXLEN;
@ -236,9 +234,6 @@ ifinit(void)
sysctl_net_pktq_setup(NULL, PF_INET6);
#endif
callout_init(&if_slowtimo_ch, 0);
if_slowtimo(NULL);
if_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK,
if_listener_cb, NULL);
@ -638,6 +633,12 @@ if_attach(ifnet_t *ifp)
/* Announce the interface. */
rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
if (ifp->if_slowtimo != NULL) {
callout_init(&ifp->if_slowtimo_ch, 0);
callout_setfunc(&ifp->if_slowtimo_ch, if_slowtimo, ifp);
if_slowtimo(ifp);
}
}
void
@ -737,6 +738,11 @@ if_detach(struct ifnet *ifp)
s = splnet();
if (ifp->if_slowtimo != NULL) {
callout_halt(&ifp->if_slowtimo_ch, NULL);
callout_destroy(&ifp->if_slowtimo_ch);
}
/*
* Do an if_down() to give protocols a chance to do something.
*/
@ -1494,24 +1500,23 @@ if_up(struct ifnet *ifp)
}
/*
* Handle interface slowtimo timer routines. Called
* from softclock, we decrement timers (if set) and
* Handle interface slowtimo timer routine. Called
* from softclock, we decrement timer (if set) and
* call the appropriate interface routine on expiration.
*/
static void
if_slowtimo(void *arg)
{
struct ifnet *ifp;
struct ifnet *ifp = arg;
int s = splnet();
IFNET_FOREACH(ifp) {
if (ifp->if_timer == 0 || --ifp->if_timer)
continue;
if (ifp->if_slowtimo != NULL)
(*ifp->if_slowtimo)(ifp);
}
KASSERT(ifp->if_slowtimo != NULL);
if (ifp->if_timer != 0 && --ifp->if_timer == 0)
(*ifp->if_slowtimo)(ifp);
splx(s);
callout_reset(&if_slowtimo_ch, hz / IFNET_SLOWHZ, if_slowtimo, NULL);
callout_schedule(&ifp->if_slowtimo_ch, hz / IFNET_SLOWHZ);
}
/*

6
sys/net/if.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: if.h,v 1.177 2014/11/26 07:22:05 ozaki-r Exp $ */
/* $NetBSD: if.h,v 1.178 2014/11/26 07:43:04 ozaki-r Exp $ */
/*-
* Copyright (c) 1999, 2000, 2001 The NetBSD Foundation, Inc.
@ -214,6 +214,7 @@ struct ifnet_lock;
#ifdef _KERNEL
#include <sys/condvar.h>
#include <sys/percpu.h>
#include <sys/callout.h>
struct ifnet_lock {
kmutex_t il_lock; /* Protects the critical section. */
@ -342,6 +343,9 @@ typedef struct ifnet {
const struct sockaddr *);
int (*if_setflags)(struct ifnet *, const short);
struct ifnet_lock *if_ioctl_lock;
#ifdef _KERNEL /* XXX kvm(3) */
callout_t if_slowtimo_ch;
#endif
} ifnet_t;
#define if_mtu if_data.ifi_mtu