Home » Mailing lists » Devel » [PATCH 1/4] net: Dynamically allocate the per cpu counters for the loopback device.
| [PATCH 1/4] net: Dynamically allocate the per cpu counters for the loopback device. [message #20851] |
Wed, 26 September 2007 23:53  |
ebiederm
Messages: 1354
Registered: February 2006
|
Senior Member |
|
|
This patch add support for dynamically allocating the statistics counters
for the loopback device and adds appropriate device methods for allocating
and freeing the loopback device.
This completes support for creating multiple instances of the loopback
device, in preparation for creating per network namespace instances.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
---
drivers/net/loopback.c | 32 ++++++++++++++++++++++++++++----
1 files changed, 28 insertions(+), 4 deletions(-)
diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index 4b6f7b2..f3018bb 100644
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -62,7 +62,6 @@ struct pcpu_lstats {
unsigned long packets;
unsigned long bytes;
};
-static DEFINE_PER_CPU(struct pcpu_lstats, pcpu_lstats);
#define LOOPBACK_OVERHEAD (128 + MAX_HEADER + 16 + 16)
@@ -134,7 +133,7 @@ static void emulate_large_send_offload(struct sk_buff *skb)
*/
static int loopback_xmit(struct sk_buff *skb, struct net_device *dev)
{
- struct pcpu_lstats *lb_stats;
+ struct pcpu_lstats *pcpu_lstats, *lb_stats;
skb_orphan(skb);
@@ -155,7 +154,8 @@ static int loopback_xmit(struct sk_buff *skb, struct net_device *dev)
dev->last_rx = jiffies;
/* it's OK to use __get_cpu_var() because BHs are off */
- lb_stats = &__get_cpu_var(pcpu_lstats);
+ pcpu_lstats = netdev_priv(dev);
+ lb_stats = per_cpu_ptr(pcpu_lstats, smp_processor_id());
lb_stats->bytes += skb->len;
lb_stats->packets++;
@@ -166,15 +166,17 @@ static int loopback_xmit(struct sk_buff *skb, struct net_device *dev)
static struct net_device_stats *get_stats(struct net_device *dev)
{
+ const struct pcpu_lstats *pcpu_lstats;
struct net_device_stats *stats = &dev->stats;
unsigned long bytes = 0;
unsigned long packets = 0;
int i;
+ pcpu_lstats = netdev_priv(dev);
for_each_possible_cpu(i) {
const struct pcpu_lstats *lb_stats;
- lb_stats = &per_cpu(pcpu_lstats, i);
+ lb_stats = per_cpu_ptr(pcpu_lstats, i);
bytes += lb_stats->bytes;
packets += lb_stats->packets;
}
@@ -198,6 +200,26 @@ static const struct ethtool_ops loopback_ethtool_ops = {
.get_rx_csum = always_on,
};
+static int loopback_dev_init(struct net_device *dev)
+{
+ struct pcpu_lstats *lstats;
+
+ lstats = alloc_percpu(struct pcpu_lstats);
+ if (!lstats)
+ return -ENOMEM;
+
+ dev->priv = lstats;
+ return 0;
+}
+
+static void loopback_dev_free(struct net_device *dev)
+{
+ struct pcpu_lstats *lstats = netdev_priv(dev);
+
+ free_percpu(lstats);
+ free_netdev(dev);
+}
+
/*
* The loopback device is special. There is only one instance and
* it is statically allocated. Don't do this for other devices.
@@ -225,6 +247,8 @@ static void loopback_setup(struct net_device *dev)
| NETIF_F_LLTX
| NETIF_F_NETNS_LOCAL,
dev->ethtool_ops = &loopback_ethtool_ops;
+ dev->init = loopback_dev_init;
+ dev->destructor = loopback_dev_free;
}
/* Setup and register the loopback device. */
--
1.5.3.rc6.17.g1911
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| [PATCH 3/4] net ipv4: When possible test for IFF_LOOPBACK and not dev == loopback_dev [message #20853 is a reply to message #20852] |
Wed, 26 September 2007 23:58  |
ebiederm
Messages: 1354
Registered: February 2006
|
Senior Member |
|
|
Now that multiple loopback devices are becoming possible it makes
the code a little cleaner and more maintainable to test if a deivice
is th a loopback device by testing dev->flags & IFF_LOOPBACK instead
of dev == loopback_dev.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
---
net/ipv4/devinet.c | 4 ++--
net/ipv4/ipconfig.c | 10 +++++++---
net/ipv4/ipvs/ip_vs_core.c | 2 +-
3 files changed, 10 insertions(+), 6 deletions(-)
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index e7f2b02..55d199e 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -1059,7 +1059,7 @@ static int inetdev_event(struct notifier_block *this, unsigned long event,
in_dev = inetdev_init(dev);
if (!in_dev)
return notifier_from_errno(-ENOMEM);
- if (dev == loopback_dev) {
+ if (dev->flags & IFF_LOOPBACK) {
IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
}
@@ -1075,7 +1075,7 @@ static int inetdev_event(struct notifier_block *this, unsigned long event,
case NETDEV_UP:
if (dev->mtu < 68)
break;
- if (dev == loopback_dev) {
+ if (dev->flags & IFF_LOOPBACK) {
struct in_ifaddr *ifa;
if ((ifa = inet_alloc_ifa()) != NULL) {
ifa->ifa_local =
diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
index 2d2e0cd..af5d5b3 100644
--- a/net/ipv4/ipconfig.c
+++ b/net/ipv4/ipconfig.c
@@ -190,11 +190,15 @@ static int __init ic_open_devs(void)
rtnl_lock();
/* bring loopback device up first */
- if (dev_change_flags(loopback_dev, loopback_dev->flags | IFF_UP) < 0)
- printk(KERN_ERR "IP-Config: Failed to open %s\n", loopback_dev->name);
+ for_each_netdev(&init_net, dev) {
+ if (!(dev->flags & IFF_LOOPBACK))
+ continue;
+ if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
+ printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
+ }
for_each_netdev(&init_net, dev) {
- if (dev == loopback_dev)
+ if (dev->flags & IFF_LOOPBACK)
continue;
if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
(!(dev->flags & IFF_LOOPBACK) &&
diff --git a/net/ipv4/ipvs/ip_vs_core.c b/net/ipv4/ipvs/ip_vs_core.c
index 7450326..fbca2a2 100644
--- a/net/ipv4/ipvs/ip_vs_core.c
+++ b/net/ipv4/ipvs/ip_vs_core.c
@@ -961,7 +961,7 @@ ip_vs_in(unsigned int hooknum, struct sk_buff **pskb,
* ... don't know why 1st test DOES NOT include 2nd (?)
*/
if (unlikely(skb->pkt_type != PACKET_HOST
- || skb->dev == loopback_dev || skb->sk)) {
+ || skb->dev->flags & IFF_LOOPBACK || skb->sk)) {
IP_VS_DBG(12, "packet type=%d proto=%d daddr=%d.%d.%d.%d ignored\n",
skb->pkt_type,
ip_hdr(skb)->protocol,
--
1.5.3.rc6.17.g1911
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| [PATCH 4/4] net: Make the loopback device per network namespace [message #20854 is a reply to message #20853] |
Thu, 27 September 2007 00:00 |
ebiederm
Messages: 1354
Registered: February 2006
|
Senior Member |
|
|
This patch makes loopback_dev per network namespace. Adding
code to create a different loopback device for each network
namespace and adding the code to free a loopback device
when a network namespace exits.
This patch modifies all users the loopback_dev so they
access it as init_net.loopback_dev, keeping all of the
code compiling and working. A later pass will be needed to
update the users to use something other than the initial network
namespace.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
---
drivers/net/loopback.c | 26 +++++++++++++++++++++-----
include/linux/netdevice.h | 1 -
include/net/net_namespace.h | 3 +++
net/core/dst.c | 5 +++--
net/decnet/dn_dev.c | 4 ++--
net/decnet/dn_route.c | 14 +++++++-------
net/ipv4/route.c | 18 +++++++++---------
net/ipv4/xfrm4_policy.c | 2 +-
net/ipv6/addrconf.c | 18 +++++++++---------
net/ipv6/netfilter/ip6t_REJECT.c | 2 +-
net/ipv6/route.c | 12 ++++++------
net/ipv6/xfrm6_policy.c | 2 +-
net/xfrm/xfrm_policy.c | 2 +-
13 files changed, 64 insertions(+), 45 deletions(-)
diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index f3018bb..0f9d8c6 100644
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -57,6 +57,7 @@
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/percpu.h>
+#include <net/net_namespace.h>
struct pcpu_lstats {
unsigned long packets;
@@ -252,7 +253,7 @@ static void loopback_setup(struct net_device *dev)
}
/* Setup and register the loopback device. */
-static int __init loopback_init(void)
+static int loopback_net_init(struct net *net)
{
struct net_device *dev;
int err;
@@ -262,12 +263,13 @@ static int __init loopback_init(void)
if (!dev)
goto out;
+ dev->nd_net = net;
err = register_netdev(dev);
if (err)
goto out_free_netdev;
err = 0;
- loopback_dev = dev;
+ net->loopback_dev = dev;
out:
if (err)
@@ -279,7 +281,21 @@ out_free_netdev:
goto out;
}
-fs_initcall(loopback_init);
+static void loopback_net_exit(struct net *net)
+{
+ struct net_device *dev = net->loopback_dev;
+
+ unregister_netdev(dev);
+}
+
+static struct pernet_operations loopback_net_ops = {
+ .init = loopback_net_init,
+ .exit = loopback_net_exit,
+};
+
+static int __init loopback_init(void)
+{
+ return register_pernet_device(&loopback_net_ops);
+}
-struct net_device *loopback_dev;
-EXPORT_SYMBOL(loopback_dev);
+fs_initcall(loopback_init);
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 2088097..71cf409 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -742,7 +742,6 @@ struct packet_type {
#include <linux/interrupt.h>
#include <linux/notifier.h>
-extern struct net_device *loopback_dev; /* The loopback */
extern rwlock_t dev_base_lock; /* Device list lock */
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index 3ea4194..13b0e3b 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -9,6 +9,7 @@
#include <linux/list.h>
struct proc_dir_entry;
+struct net_device;
struct net {
atomic_t count; /* To decided when the network
* namespace should be freed.
@@ -23,6 +24,8 @@ struct net {
struct proc_dir_entry *proc_net_stat;
struct proc_dir_entry *proc_net_root;
+ struct net_device *loopback_dev; /* The loopback */
+
struct list_head dev_base_head;
struct hlist_head *dev_name_head;
struct hlist_head *dev_index_head;
diff --git a/net/core/dst.c b/net/core/dst.c
index ad5ffa1..16958e6 100644
--- a/net/core/dst.c
+++ b/net/core/dst.c
@@ -18,6 +18,7 @@
#include <linux/types.h>
#include <net/net_namespace.h>
+#include <net/net_namespace.h>
#include <net/dst.h>
/*
@@ -278,11 +279,11 @@ static inline void dst_ifdown(struct dst_entry *dst, struct net_device *dev,
if (!unregister) {
dst->input = dst->output = dst_discard;
} else {
- dst->dev = loopback_dev;
+ dst->dev = init_net.loopback_dev;
dev_hold(dst->dev);
dev_put(dev);
if (dst->neighbour && dst->neighbour->dev == dev) {
- dst->neighbour->dev = loopback_dev;
+ dst->neighbour->dev = init_net.loopback_dev;
dev_put(dev);
dev_hold(dst->neighbour->dev);
}
diff --git a/net/decnet/dn_dev.c b/net/decnet/dn_dev.c
index bcaf4c5..26130af 100644
--- a/net/decnet/dn_dev.c
+++ b/net/decnet/dn_dev.c
@@ -869,10 +869,10 @@ last_chance:
rv = dn_dev_get_first(dev, addr);
read_unlock(&dev_base_lock);
dev_put(dev);
- if (rv == 0 || dev == loopback_dev)
+ if (rv == 0 || dev == init_net.loopback_dev)
return rv;
}
- dev = loopback_dev;
+ dev = init_net.loopback_dev;
dev_hold(dev);
goto last_chance;
}
diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c
index 96fe0aa..b7ebf99 100644
--- a/net/decnet/dn_route.c
+++ b/net/decnet/dn_route.c
@@ -887,7 +887,7 @@ static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *old
.scope = RT_SCOPE_UNIVERSE,
} },
.mark = oldflp->mark,
- .iif = loopback_dev->ifindex,
+ .iif = init_net.loopback_dev->ifindex,
.oif = oldflp->oif };
struct dn_route *rt = NULL;
struct net_device *dev_out = NULL, *dev;
@@ -904,7 +904,7 @@ static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *old
"dn_route_output_slow: dst=%04x src=%04x mark=%d"
" iif=%d oif=%d\n", dn_ntohs(oldflp->fld_dst),
dn_ntohs(oldflp->fld_src),
- oldflp->mark, loopback_dev->ifindex, oldflp->oif);
+ oldflp->mark, init_net.loopback_dev->ifindex, oldflp->oif);
/* If we have an output interface, verify its a DECnet device */
if (oldflp->oif) {
@@ -957,7 +957,7 @@ source_ok:
err = -EADDRNOTAVAIL;
if (dev_out)
dev_put(dev_out);
- dev_out = loopback_dev;
+ dev_out = init_net.loopback_dev;
dev_hold(dev_out);
if (!fl.fld_dst) {
fl.fld_dst =
@@ -966,7 +966,7 @@ source_ok:
if (!fl.fld_dst)
goto out;
}
- fl.oif = loopback_dev->ifindex;
+ fl.oif = init_net.loopback_dev->ifindex;
res.type = RTN_LOCAL;
goto make_route;
}
@@ -1012,7 +1012,7 @@ source_ok:
if (dev_out)
dev_put(dev_out);
if (dn_dev_islocal(neigh->dev, fl.fld_dst)) {
- dev_out = loopback_dev;
+ dev_out = init_net.loopback_dev;
res.type = RTN_LOCAL;
} else {
dev_out = neigh->dev;
@@ -1033,7 +1033,7 @@ source_ok:
/* Possible improvement - check all devices for local addr */
if (dn_dev_islocal(dev_out, fl.fld_dst)) {
dev_put(dev_out);
- dev_out = loopback_dev;
+ dev_out = init_net.loopback_dev;
dev_hold(dev_out);
res.type = RTN_LOCAL;
goto select_source;
@@ -1069,7 +1069,7 @@ select_source:
fl.fld_src = fl.fld_dst;
if (dev_out)
dev_put(dev_out);
- dev_out = loopback_dev;
+ dev_out = init_net.loopback_dev;
dev_hold(dev_out);
fl.oif = dev_out->ifindex;
if (res.fi)
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index ca2878d..2a9b363 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1402,8 +1402,8 @@ static void ipv4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
{
struct rtable *rt = (struct rtable *) dst;
struct in_device *idev = rt->idev;
- if (dev != loopback_dev && idev && idev->dev == dev) {
- struct in_device *loopback_idev = in_dev_get(loopback_dev);
+ if (dev != init_net.loopback_dev && idev && idev->dev == dev) {
+ struct in_device *loopback_idev = in_dev_get(init_net.loopback_dev);
if (loopback_idev) {
rt->idev = loopback_idev;
in_dev_put(idev);
@@ -1555,7 +1555,7 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
#endif
rth->rt_iif =
rth->fl.iif = dev->ifindex;
- rth->u.dst.dev = loopback_dev;
+ rth->u.dst.dev = init_net.loopback_dev;
dev_hold(rth->u.dst.dev);
rth->idev = in_dev_get(rth->u.dst.dev);
rth->fl.oif = 0;
@@ -1812,7 +1812,7 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
if (res.type == RTN_LOCAL) {
int result;
result = fib_validate_source(saddr, daddr, tos,
- loopback_dev->ifindex,
+ init_net.loopback_dev->ifindex,
dev, &spec_dst, &itag);
if (result < 0)
goto martian_source;
@@ -1879,7 +1879,7 @@ local_input:
#endif
rth->rt_iif =
rth->fl.iif = dev->ifindex;
- rth->u.dst.dev = loopback_dev;
+ rth->u.dst.dev = init_net.loopback_dev;
dev_hold(rth->u.dst.dev);
rth->idev = in_dev_get(rth->u.dst.dev);
rth->rt_gateway = daddr;
@@ -2149,7 +2149,7 @@ static int ip_route_output_slow(struct rtable **rp, const struct flowi *oldflp)
RT_SCOPE_UNIVERSE),
} },
.mark = oldflp->mark,
- .iif = loopback_dev->ifindex,
+ .iif = init_net.loopback_dev->ifindex,
.oif = oldflp->oif };
struct fib_result res;
unsigned flags = 0;
@@ -2243,9 +2243,9 @@ static int ip_route_output_slow(struct rtable **rp, const struct flowi *oldflp)
fl.fl4_dst = fl.fl4_src = htonl(INADDR_LOOPBACK);
if (dev_out)
dev_put(dev_out);
- dev_out = loopback_dev;
+ dev_out = init_net.loopback_dev;
dev_hold(dev_out);
- fl.oif = loopback_dev->ifindex;
+ fl.oif = init_net.loopback_dev->ifindex;
res.type = RTN_LOCAL;
flags |= RTCF_LOCAL;
goto make_route;
@@ -2290,7 +2290,7 @@ static int ip_route_output_slow(struct rtable **rp, const struct flowi *oldflp)
fl.fl4_src = fl.fl4_dst;
if (dev_out)
dev_put(dev_out);
- dev_out = loopback_dev;
+ dev_out = init_net.loopback_dev;
dev_hold(dev_out);
fl.oif = dev_o
...
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| Re: [PATCH 1/4] net: Dynamically allocate the per cpu counters for the loopback device. [message #20918 is a reply to message #20917] |
Thu, 27 September 2007 20:56 |
davem
Messages: 463
Registered: February 2006
|
Senior Member |
|
|
From: ebiederm@xmission.com (Eric W. Biederman)
Date: Thu, 27 Sep 2007 14:44:37 -0600
> David Miller <davem@davemloft.net> writes:
>
> > From: ebiederm@xmission.com (Eric W. Biederman)
> > Date: Thu, 27 Sep 2007 01:48:00 -0600
> >
> >> I'm not doing get_cpu/put_cpu so does the comment make sense
> >> in relationship to per_cpu_ptr?
> >
> > It is possible. But someone would need to go check for
> > sure.
>
> Verified.
>
> hard_start_xmit is called inside of a
> rcu_read_lock_bh(),rcu_read_unlock_bh() pair. Which means
> the code will only run on one cpu.
>
> Therefore we do not need get_cpu/put_cpu.
>
> In addition per_cpu_ptr is valid. As it is just a lookup
> into a NR_CPUS sized array by smp_processor_id() to return
> the address of the specific cpu.
>
> The only difference between per_cpu_ptr and __get_cpu_var()
> are the implementation details between statically allocated
> and dynamically allocated per cpu state.
>
> So the comment is still valid, and still interesting it just
> should say per_cpu_ptr instead of __get_cpu_var.
>
> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
I've already removed the comment, so you'll have to give
me a patch that adds it back with the new content :-)
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