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Date: Tue, 3 Sep 2013 10:05:26 +0200
From: Veaceslav Falico <vfalico@...hat.com>
To: Jiri Pirko <jiri@...nulli.us>
Cc: netdev@...r.kernel.org, Jay Vosburgh <fubar@...ibm.com>,
Andy Gospodarek <andy@...yhouse.net>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Alexander Duyck <alexander.h.duyck@...el.com>
Subject: Re: [PATCH RFC net-next 06/21] net: create sysfs symlinks for
neighbour devices
On Tue, Sep 03, 2013 at 09:48:53AM +0200, Jiri Pirko wrote:
>Mon, Sep 02, 2013 at 11:39:10PM CEST, vfalico@...hat.com wrote:
>>Also, remove the same functionality from bonding - it will be already done
>>for any device that links to its lower/upper neighbour.
>>
>>The links will be created for dev's kobject, and will look like
>>slave_eth0 for lower device eth0 and upper_bridge0 for upper device
>>bridge0.
>
>The pair should be either slave/master or lower/upper. It's undesirable
>to mix these two. Maybe for compatibility reasons we should leave
>current bonding sysfs files and create proper new generic ones?
I completely agree with the slave/master vs lower/upper logic, and you've
correctly understood why I've chosen this path.
I'm ok with any approach, but it looks weird. I've googled a bit and saw
that people use the slave_eth0...
So dunno what's best option here, really.
>
>I think there should be directories under netdev dir like:
>/sys/class/net/em1-
> |-upper-
> |-bond0(link)
> |-vlanx(link)
>/sys/class/net/bond0-
> |-lower-
> |-em1(link)
> |-em2(link)
>
>
>>
>>CC: Jay Vosburgh <fubar@...ibm.com>
>>CC: Andy Gospodarek <andy@...yhouse.net>
>>CC: "David S. Miller" <davem@...emloft.net>
>>CC: Eric Dumazet <edumazet@...gle.com>
>>CC: Jiri Pirko <jiri@...nulli.us>
>>CC: Alexander Duyck <alexander.h.duyck@...el.com>
>>Signed-off-by: Veaceslav Falico <vfalico@...hat.com>
>>---
>> drivers/net/bonding/bond_main.c | 11 +----------
>> drivers/net/bonding/bond_sysfs.c | 25 -------------------------
>> drivers/net/bonding/bonding.h | 2 --
>> net/core/dev.c | 29 +++++++++++++++++++++++++++++
>> 4 files changed, 30 insertions(+), 37 deletions(-)
>>
>>diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
>>index c50679f..b0b753d 100644
>>--- a/drivers/net/bonding/bond_main.c
>>+++ b/drivers/net/bonding/bond_main.c
>>@@ -1635,15 +1635,11 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
>>
>> read_unlock(&bond->lock);
>>
>>- res = bond_create_slave_symlinks(bond_dev, slave_dev);
>>- if (res)
>>- goto err_detach;
>>-
>> res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
>> new_slave);
>> if (res) {
>> pr_debug("Error %d calling netdev_rx_handler_register\n", res);
>>- goto err_dest_symlinks;
>>+ goto err_detach;
>> }
>>
>> pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
>>@@ -1655,9 +1651,6 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
>> return 0;
>>
>> /* Undo stages on error */
>>-err_dest_symlinks:
>>- bond_destroy_slave_symlinks(bond_dev, slave_dev);
>>-
>> err_detach:
>> if (!USES_PRIMARY(bond->params.mode))
>> bond_hw_addr_flush(bond_dev, slave_dev);
>>@@ -1856,8 +1849,6 @@ static int __bond_release_one(struct net_device *bond_dev,
>> bond_dev->name, slave_dev->name, bond_dev->name);
>>
>> /* must do this from outside any spinlocks */
>>- bond_destroy_slave_symlinks(bond_dev, slave_dev);
>>-
>> vlan_vids_del_by_dev(slave_dev, bond_dev);
>>
>> /* If the mode USES_PRIMARY, then this cases was handled above by
>>diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
>>index 5715277..7b962a2 100644
>>--- a/drivers/net/bonding/bond_sysfs.c
>>+++ b/drivers/net/bonding/bond_sysfs.c
>>@@ -168,31 +168,6 @@ static const struct class_attribute class_attr_bonding_masters = {
>> .namespace = bonding_namespace,
>> };
>>
>>-int bond_create_slave_symlinks(struct net_device *master,
>>- struct net_device *slave)
>>-{
>>- char linkname[IFNAMSIZ+7];
>>- int ret = 0;
>>-
>>- /* create a link from the master to the slave */
>>- sprintf(linkname, "slave_%s", slave->name);
>>- ret = sysfs_create_link(&(master->dev.kobj), &(slave->dev.kobj),
>>- linkname);
>>-
>>- return ret;
>>-
>>-}
>>-
>>-void bond_destroy_slave_symlinks(struct net_device *master,
>>- struct net_device *slave)
>>-{
>>- char linkname[IFNAMSIZ+7];
>>-
>>- sprintf(linkname, "slave_%s", slave->name);
>>- sysfs_remove_link(&(master->dev.kobj), linkname);
>>-}
>>-
>>-
>> /*
>> * Show the slaves in the current bond.
>> */
>>diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
>>index 4abc925..f7a167d 100644
>>--- a/drivers/net/bonding/bonding.h
>>+++ b/drivers/net/bonding/bonding.h
>>@@ -455,8 +455,6 @@ int bond_create(struct net *net, const char *name);
>> int bond_create_sysfs(struct bond_net *net);
>> void bond_destroy_sysfs(struct bond_net *net);
>> void bond_prepare_sysfs_group(struct bonding *bond);
>>-int bond_create_slave_symlinks(struct net_device *master, struct net_device *slave);
>>-void bond_destroy_slave_symlinks(struct net_device *master, struct net_device *slave);
>> int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);
>> int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
>> void bond_mii_monitor(struct work_struct *);
>>diff --git a/net/core/dev.c b/net/core/dev.c
>>index 7eecf35..1c3e98d 100644
>>--- a/net/core/dev.c
>>+++ b/net/core/dev.c
>>@@ -4580,6 +4580,7 @@ static int __netdev_adjacent_dev_insert(struct net_device *dev,
>> bool upper, void *private)
>> {
>> struct netdev_adjacent *adj, *neigh = NULL;
>>+ char linkname[IFNAMSIZ+7];
>> int ret;
>>
>> adj = __netdev_find_adj(dev, adj_dev, upper, false);
>>@@ -4628,6 +4629,16 @@ static int __netdev_adjacent_dev_insert(struct net_device *dev,
>> */
>> if (master)
>> neigh->private = private;
>>+
>>+ sprintf(linkname, "slave_%s", adj_dev->name);
>>+ ret = sysfs_create_link(&(dev->dev.kobj),
>>+ &(adj_dev->dev.kobj),
>>+ linkname);
>>+ if (ret) {
>>+ kfree(neigh);
>>+ kfree(adj);
>>+ return ret;
>>+ }
>> list_add_tail_rcu(&neigh->list,
>> &dev->neighbour_dev_list.lower);
>> }
>>@@ -4635,10 +4646,24 @@ static int __netdev_adjacent_dev_insert(struct net_device *dev,
>> return 0;
>> }
>>
>>+ /* it's upper neighbour, we don't care if it's master or not */
>>+ if (neigh) {
>>+ sprintf(linkname, "upper_%s", adj_dev->name);
>>+ ret = sysfs_create_link(&(dev->dev.kobj), &(adj_dev->dev.kobj),
>>+ linkname);
>>+ if (ret) {
>>+ kfree(neigh);
>>+ kfree(adj);
>>+ return ret;
>>+ }
>>+ }
>>+
>> /* Ensure that master upper link is always the first item in list. */
>> if (master) {
>> ret = sysfs_create_link(&(dev->dev.kobj), &(adj_dev->dev.kobj), "master");
>> if (ret) {
>>+ if (neigh)
>>+ sysfs_remove_link(&(dev->dev.kobj), linkname);
>> kfree(neigh);
>> kfree(adj);
>> return ret;
>>@@ -4678,6 +4703,7 @@ void __netdev_adjacent_dev_remove(struct net_device *dev,
>> struct net_device *adj_dev, bool upper)
>> {
>> struct netdev_adjacent *adj, *neighbour;
>>+ char linkname[IFNAMSIZ+7];
>>
>> if (upper) {
>> adj = __netdev_find_upper(dev, adj_dev);
>>@@ -4725,6 +4751,9 @@ void __netdev_adjacent_dev_remove(struct net_device *dev,
>> list_del_rcu(&neighbour->list);
>> if (neighbour->master && upper)
>> sysfs_remove_link(&(dev->dev.kobj), "master");
>>+ sprintf(linkname, "%s_%s", upper ? "upper" : "slave",
>>+ adj_dev->name);
>>+ sysfs_remove_link(&(dev->dev.kobj), linkname);
>> dev_put(adj_dev);
>> kfree_rcu(neighbour, rcu);
>> }
>>--
>>1.8.4
>>
--
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