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Date: Sat, 8 Apr 2017 20:10:58 +0200
From: Oliver Hartkopp <socketcan@...tkopp.net>
To: Mario Kicherer <dev@...herer.org>, netdev@...r.kernel.org,
linux-can@...r.kernel.org, mkl@...gutronix.de
Subject: Re: [PATCH net-next v2] can: initial support for network namespaces
Hi Mario,
I started to convert the statistics ... but there's some code adaption
missing in proc.c
Is this the right way to start?
diff --git a/include/net/netns/can.h b/include/net/netns/can.h
index e8beba772f1a..a8866ae1788f 100644
--- a/include/net/netns/can.h
+++ b/include/net/netns/can.h
@@ -8,6 +8,8 @@
#include <linux/spinlock.h>
struct dev_rcv_lists;
+struct s_stats;
+struct s_pstats;
struct netns_can {
#if IS_ENABLED(CONFIG_PROC_FS)
@@ -26,6 +28,8 @@ struct netns_can {
/* receive filters subscribed for 'all' CAN devices */
struct dev_rcv_lists *can_rx_alldev_list;
spinlock_t can_rcvlists_lock;
+ struct s_stats *can_stats; /* packet statistics */
+ struct s_pstats *can_pstats; /* receive list statistics */
};
#endif /* __NETNS_CAN_H__ */
diff --git a/net/can/af_can.c b/net/can/af_can.c
index abf7d854a94d..db35d6a5ac26 100644
--- a/net/can/af_can.c
+++ b/net/can/af_can.c
@@ -84,8 +84,6 @@ static const struct can_proto *proto_tab[CAN_NPROTO]
__read_mostly;
static DEFINE_MUTEX(proto_tab_lock);
struct timer_list can_stattimer; /* timer for statistics update */
-struct s_stats can_stats; /* packet statistics */
-struct s_pstats can_pstats; /* receive list statistics */
static atomic_t skbcounter = ATOMIC_INIT(0);
@@ -223,6 +221,7 @@ int can_send(struct sk_buff *skb, int loop)
{
struct sk_buff *newskb = NULL;
struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
+ struct net *net = dev_net(skb->dev);
int err = -EINVAL;
if (skb->len == CAN_MTU) {
@@ -311,8 +310,8 @@ int can_send(struct sk_buff *skb, int loop)
netif_rx_ni(newskb);
/* update statistics */
- can_stats.tx_frames++;
- can_stats.tx_frames_delta++;
+ net->can.can_stats->tx_frames++;
+ net->can.can_stats->tx_frames_delta++;
return 0;
@@ -501,9 +500,9 @@ int can_rx_register(struct net *net, struct
net_device *dev, canid_t can_id,
hlist_add_head_rcu(&r->list, rl);
d->entries++;
- can_pstats.rcv_entries++;
- if (can_pstats.rcv_entries_max < can_pstats.rcv_entries)
- can_pstats.rcv_entries_max = can_pstats.rcv_entries;
+ net->can.can_pstats->rcv_entries++;
+ if (net->can.can_pstats->rcv_entries_max <
net->can.can_pstats->rcv_entries)
+ net->can.can_pstats->rcv_entries_max = net->can.can_pstats->rcv_entries;
} else {
kmem_cache_free(rcv_cache, r);
err = -ENODEV;
@@ -591,8 +590,8 @@ void can_rx_unregister(struct net *net, struct
net_device *dev, canid_t can_id,
hlist_del_rcu(&r->list);
d->entries--;
- if (can_pstats.rcv_entries > 0)
- can_pstats.rcv_entries--;
+ if (net->can.can_pstats->rcv_entries > 0)
+ net->can.can_pstats->rcv_entries--;
/* remove device structure requested by NETDEV_UNREGISTER */
if (d->remove_on_zero_entries && !d->entries) {
@@ -686,11 +685,12 @@ static int can_rcv_filter(struct dev_rcv_lists *d,
struct sk_buff *skb)
static void can_receive(struct sk_buff *skb, struct net_device *dev)
{
struct dev_rcv_lists *d;
+ struct net *net = dev_net(dev);
int matches;
/* update statistics */
- can_stats.rx_frames++;
- can_stats.rx_frames_delta++;
+ net->can.can_stats->rx_frames++;
+ net->can.can_stats->rx_frames_delta++;
/* create non-zero unique skb identifier together with *skb */
while (!(can_skb_prv(skb)->skbcnt))
@@ -699,10 +699,10 @@ static void can_receive(struct sk_buff *skb,
struct net_device *dev)
rcu_read_lock();
/* deliver the packet to sockets listening on all devices */
- matches = can_rcv_filter(dev_net(dev)->can.can_rx_alldev_list, skb);
+ matches = can_rcv_filter(net->can.can_rx_alldev_list, skb);
/* find receive list for this device */
- d = find_dev_rcv_lists(dev_net(dev), dev);
+ d = find_dev_rcv_lists(net, dev);
if (d)
matches += can_rcv_filter(d, skb);
@@ -712,8 +712,8 @@ static void can_receive(struct sk_buff *skb, struct
net_device *dev)
consume_skb(skb);
if (matches > 0) {
- can_stats.matches++;
- can_stats.matches_delta++;
+ net->can.can_stats->matches++;
+ net->can.can_stats->matches_delta++;
}
}
@@ -878,6 +878,9 @@ static int can_pernet_init(struct net *net)
net->can.can_rx_alldev_list =
kzalloc(sizeof(struct dev_rcv_lists), GFP_KERNEL);
+ net->can.can_stats = kzalloc(sizeof(struct s_stats), GFP_KERNEL);
+ net->can.can_pstats = kzalloc(sizeof(struct s_pstats), GFP_KERNEL);
+
if (IS_ENABLED(CONFIG_PROC_FS))
can_init_proc(net);
diff --git a/net/can/af_can.h b/net/can/af_can.h
index f273c9d9b129..10d46bd2e9ea 100644
--- a/net/can/af_can.h
+++ b/net/can/af_can.h
@@ -110,9 +110,6 @@ struct s_pstats {
unsigned long rcv_entries_max;
};
-/* receive filters subscribed for 'all' CAN devices */
-extern struct dev_rcv_lists can_rx_alldev_list;
-
/* function prototypes for the CAN networklayer procfs (proc.c) */
void can_init_proc(struct net *net);
void can_remove_proc(struct net *net);
@@ -120,8 +117,5 @@ void can_stat_update(unsigned long data);
/* structures and variables from af_can.c needed in proc.c for reading */
extern struct timer_list can_stattimer; /* timer for statistics
update */
-extern struct s_stats can_stats; /* packet statistics */
-extern struct s_pstats can_pstats; /* receive list statistics */
-extern struct hlist_head can_rx_dev_list; /* rx dispatcher structures */
#endif /* AF_CAN_H */
On 04/08/2017 07:24 PM, Oliver Hartkopp wrote:
> Hello Mario,
>
> unfortunately Marc pushed this patch before I finally was able to review
> it ... :-(
>
> Some questions:
>
> On 02/21/2017 12:19 PM, Mario Kicherer wrote:
>> This patch adds initial support for network namespaces. The changes only
>> enable support in the CAN raw, proc and af_can code. GW and BCM still
>> have their checks that ensure that they are used only from the main
>> namespace.
>>
>> The patch boils down to moving the global structures, i.e. the global
>> filter list and their /proc stats, into a per-namespace structure and
>> passing
>> around the corresponding "struct net" in a lot of different places.
>
> (..)
>
>> diff --git a/include/net/netns/can.h b/include/net/netns/can.h
>> new file mode 100644
>> index 0000000..e8beba7
>> --- /dev/null
>> +++ b/include/net/netns/can.h
>> @@ -0,0 +1,31 @@
>> +/*
>> + * can in net namespaces
>> + */
>> +
>> +#ifndef __NETNS_CAN_H__
>> +#define __NETNS_CAN_H__
>> +
>> +#include <linux/spinlock.h>
>> +
>> +struct dev_rcv_lists;
>> +
>> +struct netns_can {
>> +#if IS_ENABLED(CONFIG_PROC_FS)
>> + struct proc_dir_entry *proc_dir;
>> + struct proc_dir_entry *pde_version;
>> + struct proc_dir_entry *pde_stats;
>> + struct proc_dir_entry *pde_reset_stats;
>> + struct proc_dir_entry *pde_rcvlist_all;
>> + struct proc_dir_entry *pde_rcvlist_fil;
>> + struct proc_dir_entry *pde_rcvlist_inv;
>> + struct proc_dir_entry *pde_rcvlist_sff;
>> + struct proc_dir_entry *pde_rcvlist_eff;
>> + struct proc_dir_entry *pde_rcvlist_err;
>> +#endif
>> +
>> + /* receive filters subscribed for 'all' CAN devices */
>> + struct dev_rcv_lists *can_rx_alldev_list;
>> + spinlock_t can_rcvlists_lock;
>
> You didn't include the statistics here:
>
> + struct s_stats *can_stats; /* packet statistics */
> + struct s_pstats *can_pstats; /* receive list statistics */
>
> which need to be per-net too, right?
>
> (..)
>> @@ -877,6 +871,41 @@ static int can_notifier(struct notifier_block
>> *nb, unsigned long msg,
>> return NOTIFY_DONE;
>> }
>>
>> +int can_pernet_init(struct net *net)
>> +{
>> + net->can.can_rcvlists_lock =
>> + __SPIN_LOCK_UNLOCKED(net->can.can_rcvlists_lock);
>> + net->can.can_rx_alldev_list =
>> + kzalloc(sizeof(struct dev_rcv_lists), GFP_KERNEL);
>> + memset(net->can.can_rx_alldev_list, 0, sizeof(struct
>> dev_rcv_lists));
>> +
>> + if (IS_ENABLED(CONFIG_PROC_FS))
>> + can_init_proc(net);
>> +
>> + return 0;
>> +}
>> +
>> +void can_pernet_exit(struct net *net)
>> +{
>> + struct net_device *dev;
>> +
>> + if (IS_ENABLED(CONFIG_PROC_FS))
>> + can_remove_proc(net);
>> +
>> + /* remove created dev_rcv_lists from still registered CAN devices */
>> + rcu_read_lock();
>> + for_each_netdev_rcu(net, dev) {
>> + if (dev->type == ARPHRD_CAN && dev->ml_priv) {
>> + struct dev_rcv_lists *d = dev->ml_priv;
>> +
>> + BUG_ON(d->entries);
>> + kfree(d);
>> + dev->ml_priv = NULL;
>> + }
>> + }
>> + rcu_read_unlock();
>
> You do a kzalloc(sizeof(struct dev_rcv_lists), GFP_KERNEL) in
> can_pernet_init().
>
> Doesn't it need a kfree(net->can.can_rx_alldev_list) then??
>
> Regards,
> Oliver
> --
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View attachment "can_netns_stats.patch" of type "text/x-patch" (5164 bytes)
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