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Date: Thu, 30 Aug 2012 10:05:16 -0400
From: Vlad Yasevich <vyasevic@...hat.com>
To: "Michael S. Tsirkin" <mst@...hat.com>
CC: netdev@...r.kernel.org
Subject: Re: [RFC PATCH bridge 5/5] bridge: Add sysfs interface to display
VLANS
On 08/30/2012 08:27 AM, Michael S. Tsirkin wrote:
> On Thu, Aug 23, 2012 at 03:29:55PM -0400, Vlad Yasevich wrote:
>> Add a binary sysfs file that will dump out vlans currently configured on the
>> port.
>>
>> Signed-off-by: Vlad Yasevich <vyasevic@...hat.com>
>
> So what's the format here? I could not tell.
> List of vlans? Why binary? Why not make it text in that case?
> This would also allow reporting "all" if filtering
> is disabled and "untagged" for untagged packets.
I decided to do binary because text may result in more then page worth
of data. The display tool will know how to display things properly.
-vlad
>
>> ---
>> include/linux/if_bridge.h | 1 +
>> net/bridge/br_if.c | 34 ++++++++++++++++++++++++++++++++++
>> net/bridge/br_private.h | 2 ++
>> net/bridge/br_sysfs_if.c | 28 ++++++++++++++++++++++++++++
>> 4 files changed, 65 insertions(+), 0 deletions(-)
>>
>> diff --git a/include/linux/if_bridge.h b/include/linux/if_bridge.h
>> index ab750dd..d0f869b 100644
>> --- a/include/linux/if_bridge.h
>> +++ b/include/linux/if_bridge.h
>> @@ -20,6 +20,7 @@
>> #define SYSFS_BRIDGE_PORT_SUBDIR "brif"
>> #define SYSFS_BRIDGE_PORT_ATTR "brport"
>> #define SYSFS_BRIDGE_PORT_LINK "bridge"
>> +#define SYSFS_BRIDGE_PORT_VLANS "vlans"
>>
>> #define BRCTL_VERSION 1
>>
>> diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
>> index 90c1038..3963748 100644
>> --- a/net/bridge/br_if.c
>> +++ b/net/bridge/br_if.c
>> @@ -510,6 +510,40 @@ int br_del_port_vlan(struct net_bridge_port *p, unsigned long vlan)
>> return 0;
>> }
>>
>> +size_t br_port_fill_vlans(struct net_bridge_port *p, char* buf,
>> + unsigned long max, unsigned long skip)
>> +{
>> + unsigned long *map;
>> + unsigned short *vid = (unsigned short *)buf;
>> + unsigned short i;
>> + int num = 0;
>> +
>> + if (skip > (VLAN_N_VID+1))
>> + return -EINVAL;
>> +
>> + memset(buf, 0, max * sizeof(unsigned short));
>
> Isn't max is in bytes? why is this safe?
>
>> +
>> + rcu_read_lock();
>> + map = rcu_dereference(p->vlan_map);
>> + if (!map)
>> + goto out;
>> +
>> + for (i = skip + 1; i < VLAN_N_VID + 1; i++) {
>
> Isn't skip in bytes too? Why do you compare it to i which is
> in dwords?
>
>> + if (test_bit(i, map)) {
>> + if (num > max)
>> + goto out;
>> +
>> + *vid = i-1;
>> + vid++;
>> + num++;
>> + }
>> + }
>> +out:
>> + rcu_read_unlock();
>> +
>> + return num*sizeof(unsigned short);
>> +}
>> +
>> void __net_exit br_net_exit(struct net *net)
>> {
>> struct net_device *dev;
>> diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
>> index 5639c1c..cf95cd7 100644
>> --- a/net/bridge/br_private.h
>> +++ b/net/bridge/br_private.h
>> @@ -404,6 +404,8 @@ extern netdev_features_t br_features_recompute(struct net_bridge *br,
>> netdev_features_t features);
>> extern int br_set_port_vlan(struct net_bridge_port *p, unsigned long vid);
>> extern int br_del_port_vlan(struct net_bridge_port *p, unsigned long vid);
>> +extern size_t br_port_fill_vlans(struct net_bridge_port *p, char *buf,
>> + unsigned long max, unsigned long skip);
>>
>> /* br_input.c */
>> extern int br_handle_frame_finish(struct sk_buff *skb);
>> diff --git a/net/bridge/br_sysfs_if.c b/net/bridge/br_sysfs_if.c
>> index 13b36bd..a81e2ef 100644
>> --- a/net/bridge/br_sysfs_if.c
>> +++ b/net/bridge/br_sysfs_if.c
>> @@ -234,6 +234,29 @@ const struct sysfs_ops brport_sysfs_ops = {
>> };
>>
>> /*
>> + * Export the vlan table for a given port as a binary file.
>> + * The records are unsgined shorts.
>> + *
>> + * Returns the number of bytes read.
>> + */
>> +static ssize_t brport_vlans_read(struct file *filp, struct kobject *kobj,
>> + struct bin_attribute *bin_attr,
>> + char *buf, loff_t off, size_t count)
>> +{
>> + struct net_bridge_port *p = to_brport(kobj);
>> +
>> + return br_port_fill_vlans(p, buf,
>> + count/sizeof(unsigned short),
>> + off/sizeof(unsigned short));
>> +}
>> +
>> +static struct bin_attribute port_vlans = {
>> + .attr = { .name = SYSFS_BRIDGE_PORT_VLANS,
>> + .mode = S_IRUGO, },
>> + .read = brport_vlans_read,
>> +};
>> +
>> +/*
>> * Add sysfs entries to ethernet device added to a bridge.
>> * Creates a brport subdirectory with bridge attributes.
>> * Puts symlink in bridge's brif subdirectory
>> @@ -255,6 +278,11 @@ int br_sysfs_addif(struct net_bridge_port *p)
>> return err;
>> }
>>
>> + err = sysfs_create_bin_file(&p->kobj, &port_vlans);
>> + if (err) {
>> + return err;
>> + }
>> +
>> strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
>> return sysfs_create_link(br->ifobj, &p->kobj, p->sysfs_name);
>> }
>> --
>> 1.7.7.6
>>
>> --
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