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-rw-r--r--net/can/af_can.c118
-rw-r--r--net/can/af_can.h4
-rw-r--r--net/can/proc.c93
3 files changed, 96 insertions, 119 deletions
diff --git a/net/can/af_can.c b/net/can/af_can.c
index 51adc4c2b86..bc18b084ffd 100644
--- a/net/can/af_can.c
+++ b/net/can/af_can.c
@@ -77,8 +77,8 @@ static int stats_timer __read_mostly = 1;
module_param(stats_timer, int, S_IRUGO);
MODULE_PARM_DESC(stats_timer, "enable timer for statistics (default:on)");
-HLIST_HEAD(can_rx_dev_list);
-static struct dev_rcv_lists can_rx_alldev_list;
+/* receive filters subscribed for 'all' CAN devices */
+struct dev_rcv_lists can_rx_alldev_list;
static DEFINE_SPINLOCK(can_rcvlists_lock);
static struct kmem_cache *rcv_cache __read_mostly;
@@ -292,28 +292,10 @@ EXPORT_SYMBOL(can_send);
static struct dev_rcv_lists *find_dev_rcv_lists(struct net_device *dev)
{
- struct dev_rcv_lists *d = NULL;
- struct hlist_node *n;
-
- /*
- * find receive list for this device
- *
- * The hlist_for_each_entry*() macros curse through the list
- * using the pointer variable n and set d to the containing
- * struct in each list iteration. Therefore, after list
- * iteration, d is unmodified when the list is empty, and it
- * points to last list element, when the list is non-empty
- * but no match in the loop body is found. I.e. d is *not*
- * NULL when no match is found. We can, however, use the
- * cursor variable n to decide if a match was found.
- */
-
- hlist_for_each_entry_rcu(d, n, &can_rx_dev_list, list) {
- if (d->dev == dev)
- break;
- }
-
- return n ? d : NULL;
+ if (!dev)
+ return &can_rx_alldev_list;
+ else
+ return (struct dev_rcv_lists *)dev->ml_priv;
}
/**
@@ -468,16 +450,6 @@ int can_rx_register(struct net_device *dev, canid_t can_id, canid_t mask,
EXPORT_SYMBOL(can_rx_register);
/*
- * can_rx_delete_device - rcu callback for dev_rcv_lists structure removal
- */
-static void can_rx_delete_device(struct rcu_head *rp)
-{
- struct dev_rcv_lists *d = container_of(rp, struct dev_rcv_lists, rcu);
-
- kfree(d);
-}
-
-/*
* can_rx_delete_receiver - rcu callback for single receiver entry removal
*/
static void can_rx_delete_receiver(struct rcu_head *rp)
@@ -541,7 +513,6 @@ void can_rx_unregister(struct net_device *dev, canid_t can_id, canid_t mask,
"dev %s, id %03X, mask %03X\n",
DNAME(dev), can_id, mask);
r = NULL;
- d = NULL;
goto out;
}
@@ -552,10 +523,10 @@ void can_rx_unregister(struct net_device *dev, canid_t can_id, canid_t mask,
can_pstats.rcv_entries--;
/* remove device structure requested by NETDEV_UNREGISTER */
- if (d->remove_on_zero_entries && !d->entries)
- hlist_del_rcu(&d->list);
- else
- d = NULL;
+ if (d->remove_on_zero_entries && !d->entries) {
+ kfree(d);
+ dev->ml_priv = NULL;
+ }
out:
spin_unlock(&can_rcvlists_lock);
@@ -563,10 +534,6 @@ void can_rx_unregister(struct net_device *dev, canid_t can_id, canid_t mask,
/* schedule the receiver item for deletion */
if (r)
call_rcu(&r->rcu, can_rx_delete_receiver);
-
- /* schedule the device structure for deletion */
- if (d)
- call_rcu(&d->rcu, can_rx_delete_device);
}
EXPORT_SYMBOL(can_rx_unregister);
@@ -780,48 +747,35 @@ static int can_notifier(struct notifier_block *nb, unsigned long msg,
case NETDEV_REGISTER:
- /*
- * create new dev_rcv_lists for this device
- *
- * N.B. zeroing the struct is the correct initialization
- * for the embedded hlist_head structs.
- * Another list type, e.g. list_head, would require
- * explicit initialization.
- */
-
+ /* create new dev_rcv_lists for this device */
d = kzalloc(sizeof(*d), GFP_KERNEL);
if (!d) {
printk(KERN_ERR
"can: allocation of receive list failed\n");
return NOTIFY_DONE;
}
- d->dev = dev;
-
- spin_lock(&can_rcvlists_lock);
- hlist_add_head_rcu(&d->list, &can_rx_dev_list);
- spin_unlock(&can_rcvlists_lock);
+ BUG_ON(dev->ml_priv);
+ dev->ml_priv = d;
break;
case NETDEV_UNREGISTER:
spin_lock(&can_rcvlists_lock);
- d = find_dev_rcv_lists(dev);
+ d = dev->ml_priv;
if (d) {
- if (d->entries) {
+ if (d->entries)
d->remove_on_zero_entries = 1;
- d = NULL;
- } else
- hlist_del_rcu(&d->list);
+ else {
+ kfree(d);
+ dev->ml_priv = NULL;
+ }
} else
printk(KERN_ERR "can: notifier: receive list not "
"found for dev %s\n", dev->name);
spin_unlock(&can_rcvlists_lock);
- if (d)
- call_rcu(&d->rcu, can_rx_delete_device);
-
break;
}
@@ -853,21 +807,13 @@ static __init int can_init(void)
{
printk(banner);
+ memset(&can_rx_alldev_list, 0, sizeof(can_rx_alldev_list));
+
rcv_cache = kmem_cache_create("can_receiver", sizeof(struct receiver),
0, 0, NULL);
if (!rcv_cache)
return -ENOMEM;
- /*
- * Insert can_rx_alldev_list for reception on all devices.
- * This struct is zero initialized which is correct for the
- * embedded hlist heads, the dev pointer, and the entries counter.
- */
-
- spin_lock(&can_rcvlists_lock);
- hlist_add_head_rcu(&can_rx_alldev_list.list, &can_rx_dev_list);
- spin_unlock(&can_rcvlists_lock);
-
if (stats_timer) {
/* the statistics are updated every second (timer triggered) */
setup_timer(&can_stattimer, can_stat_update, 0);
@@ -887,8 +833,7 @@ static __init int can_init(void)
static __exit void can_exit(void)
{
- struct dev_rcv_lists *d;
- struct hlist_node *n, *next;
+ struct net_device *dev;
if (stats_timer)
del_timer(&can_stattimer);
@@ -900,14 +845,19 @@ static __exit void can_exit(void)
unregister_netdevice_notifier(&can_netdev_notifier);
sock_unregister(PF_CAN);
- /* remove can_rx_dev_list */
- spin_lock(&can_rcvlists_lock);
- hlist_del(&can_rx_alldev_list.list);
- hlist_for_each_entry_safe(d, n, next, &can_rx_dev_list, list) {
- hlist_del(&d->list);
- kfree(d);
+ /* remove created dev_rcv_lists from still registered CAN devices */
+ rcu_read_lock();
+ for_each_netdev_rcu(&init_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;
+ }
}
- spin_unlock(&can_rcvlists_lock);
+ rcu_read_unlock();
rcu_barrier(); /* Wait for completion of call_rcu()'s */
diff --git a/net/can/af_can.h b/net/can/af_can.h
index 18f91e37cc3..34253b84e30 100644
--- a/net/can/af_can.h
+++ b/net/can/af_can.h
@@ -63,10 +63,8 @@ struct receiver {
enum { RX_ERR, RX_ALL, RX_FIL, RX_INV, RX_EFF, RX_MAX };
+/* per device receive filters linked at dev->ml_priv */
struct dev_rcv_lists {
- struct hlist_node list;
- struct rcu_head rcu;
- struct net_device *dev;
struct hlist_head rx[RX_MAX];
struct hlist_head rx_sff[0x800];
int remove_on_zero_entries;
diff --git a/net/can/proc.c b/net/can/proc.c
index 9b9ad29be56..f4265cc9c3f 100644
--- a/net/can/proc.c
+++ b/net/can/proc.c
@@ -45,6 +45,7 @@
#include <linux/proc_fs.h>
#include <linux/list.h>
#include <linux/rcupdate.h>
+#include <linux/if_arp.h>
#include <linux/can/core.h>
#include "af_can.h"
@@ -84,6 +85,9 @@ static const char rx_list_name[][8] = {
[RX_EFF] = "rx_eff",
};
+/* receive filters subscribed for 'all' CAN devices */
+extern struct dev_rcv_lists can_rx_alldev_list;
+
/*
* af_can statistics stuff
*/
@@ -190,10 +194,6 @@ void can_stat_update(unsigned long data)
/*
* proc read functions
- *
- * From known use-cases we expect about 10 entries in a receive list to be
- * printed in the proc_fs. So PAGE_SIZE is definitely enough space here.
- *
*/
static void can_print_rcvlist(struct seq_file *m, struct hlist_head *rx_list,
@@ -202,7 +202,6 @@ static void can_print_rcvlist(struct seq_file *m, struct hlist_head *rx_list,
struct receiver *r;
struct hlist_node *n;
- rcu_read_lock();
hlist_for_each_entry_rcu(r, n, rx_list, list) {
char *fmt = (r->can_id & CAN_EFF_FLAG)?
" %-5s %08X %08x %08x %08x %8ld %s\n" :
@@ -212,7 +211,6 @@ static void can_print_rcvlist(struct seq_file *m, struct hlist_head *rx_list,
(unsigned long)r->func, (unsigned long)r->data,
r->matches, r->ident);
}
- rcu_read_unlock();
}
static void can_print_recv_banner(struct seq_file *m)
@@ -346,24 +344,39 @@ static const struct file_operations can_version_proc_fops = {
.release = single_release,
};
+static inline void can_rcvlist_proc_show_one(struct seq_file *m, int idx,
+ struct net_device *dev,
+ struct dev_rcv_lists *d)
+{
+ if (!hlist_empty(&d->rx[idx])) {
+ can_print_recv_banner(m);
+ can_print_rcvlist(m, &d->rx[idx], dev);
+ } else
+ seq_printf(m, " (%s: no entry)\n", DNAME(dev));
+
+}
+
static int can_rcvlist_proc_show(struct seq_file *m, void *v)
{
/* double cast to prevent GCC warning */
int idx = (int)(long)m->private;
+ struct net_device *dev;
struct dev_rcv_lists *d;
- struct hlist_node *n;
seq_printf(m, "\nreceive list '%s':\n", rx_list_name[idx]);
rcu_read_lock();
- hlist_for_each_entry_rcu(d, n, &can_rx_dev_list, list) {
- if (!hlist_empty(&d->rx[idx])) {
- can_print_recv_banner(m);
- can_print_rcvlist(m, &d->rx[idx], d->dev);
- } else
- seq_printf(m, " (%s: no entry)\n", DNAME(d->dev));
+ /* receive list for 'all' CAN devices (dev == NULL) */
+ d = &can_rx_alldev_list;
+ can_rcvlist_proc_show_one(m, idx, NULL, d);
+
+ /* receive list for registered CAN devices */
+ for_each_netdev_rcu(&init_net, dev) {
+ if (dev->type == ARPHRD_CAN && dev->ml_priv)
+ can_rcvlist_proc_show_one(m, idx, dev, dev->ml_priv);
}
+
rcu_read_unlock();
seq_putc(m, '\n');
@@ -383,34 +396,50 @@ static const struct file_operations can_rcvlist_proc_fops = {
.release = single_release,
};
+static inline void can_rcvlist_sff_proc_show_one(struct seq_file *m,
+ struct net_device *dev,
+ struct dev_rcv_lists *d)
+{
+ int i;
+ int all_empty = 1;
+
+ /* check wether at least one list is non-empty */
+ for (i = 0; i < 0x800; i++)
+ if (!hlist_empty(&d->rx_sff[i])) {
+ all_empty = 0;
+ break;
+ }
+
+ if (!all_empty) {
+ can_print_recv_banner(m);
+ for (i = 0; i < 0x800; i++) {
+ if (!hlist_empty(&d->rx_sff[i]))
+ can_print_rcvlist(m, &d->rx_sff[i], dev);
+ }
+ } else
+ seq_printf(m, " (%s: no entry)\n", DNAME(dev));
+}
+
static int can_rcvlist_sff_proc_show(struct seq_file *m, void *v)
{
+ struct net_device *dev;
struct dev_rcv_lists *d;
- struct hlist_node *n;
/* RX_SFF */
seq_puts(m, "\nreceive list 'rx_sff':\n");
rcu_read_lock();
- hlist_for_each_entry_rcu(d, n, &can_rx_dev_list, list) {
- int i, all_empty = 1;
- /* check wether at least one list is non-empty */
- for (i = 0; i < 0x800; i++)
- if (!hlist_empty(&d->rx_sff[i])) {
- all_empty = 0;
- break;
- }
-
- if (!all_empty) {
- can_print_recv_banner(m);
- for (i = 0; i < 0x800; i++) {
- if (!hlist_empty(&d->rx_sff[i]))
- can_print_rcvlist(m, &d->rx_sff[i],
- d->dev);
- }
- } else
- seq_printf(m, " (%s: no entry)\n", DNAME(d->dev));
+
+ /* sff receive list for 'all' CAN devices (dev == NULL) */
+ d = &can_rx_alldev_list;
+ can_rcvlist_sff_proc_show_one(m, NULL, d);
+
+ /* sff receive list for registered CAN devices */
+ for_each_netdev_rcu(&init_net, dev) {
+ if (dev->type == ARPHRD_CAN && dev->ml_priv)
+ can_rcvlist_sff_proc_show_one(m, dev, dev->ml_priv);
}
+
rcu_read_unlock();
seq_putc(m, '\n');
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-03 16:53:54 +0000