netdev - Re: [patch net-next V7] net: introduce ethernet teaming device

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Date:	Sat, 12 Nov 2011 01:15:00 +0100
From:	Jiri Pirko <jpirko@...hat.com>
To:	Flavio Leitner <fbl@...hat.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	eric.dumazet@...il.com, bhutchings@...arflare.com,
	shemminger@...tta.com, fubar@...ibm.com, andy@...yhouse.net,
	tgraf@...radead.org, ebiederm@...ssion.com, mirqus@...il.com,
	kaber@...sh.net, greearb@...delatech.com, jesse@...ira.com,
	benjamin.poirier@...il.com, jzupka@...hat.com, ivecera@...hat.com
Subject: Re: [patch net-next V7] net: introduce ethernet teaming device

Fri, Nov 11, 2011 at 08:58:45PM CET, fbl@...hat.com wrote:
>On Fri, 11 Nov 2011 17:05:09 -0200
>Flavio Leitner <fbl@...hat.com> wrote:
>
>> On Fri, 11 Nov 2011 16:04:41 -0200
>> Flavio Leitner <fbl@...hat.com> wrote:
>> 
>> > On Thu, 10 Nov 2011 16:41:38 +0100
>> > Jiri Pirko <jpirko@...hat.com> wrote:
>> > 
>> > > This patch introduces new network device called team. It supposes to be
>> > > very fast, simple, userspace-driven alternative to existing bonding
>> > > driver.
>> > > 
>> > > Userspace library called libteam with couple of demo apps is available
>> > > here:
>> > > https://github.com/jpirko/libteam
>> > > Note it's still in its dipers atm.
>> > > 
>> > > team<->libteam use generic netlink for communication. That and rtnl
>> > > suppose to be the only way to configure team device, no sysfs etc.
>> > > 
>> > > Python binding of libteam was recently introduced.
>> > > Daemon providing arpmon/miimon active-backup functionality will be
>> > > introduced shortly. All what's necessary is already implemented in
>> > > kernel team driver.
>> > > 
>> > > Signed-off-by: Jiri Pirko <jpirko@...hat.com>
>> > > 
>> > > v6->v7:
>> > > 	- transmit and receive functions are not checked in hot paths.
>> > > 	  That also resolves memory leak on transmit when no port is
>> > > 	  present
>> > > 
>> > 
>> > You're right. No need to patch those function names if we use libnl
>> > from git.
>> > 
>> > [...]
>> > > +static void team_vlan_rx_add_vid(struct net_device *dev, uint16_t vid)
>> > > +{
>> > > +	struct team *team = netdev_priv(dev);
>> > > +	struct team_port *port;
>> > > +
>> > > +	rcu_read_lock();
>> > > +	list_for_each_entry_rcu(port, &team->port_list, list) {
>> > > +		const struct net_device_ops *ops = port->dev->netdev_ops;
>> > > +
>> > > +		ops->ndo_vlan_rx_add_vid(port->dev, vid);
>> > 
>> > This causes a oops when enslaving a tg3 device because there is
>> > no ndo_vlan_rx_add_vid().
>> > 
>> Sorry, I should have said when bring team0 up:
>> 
>> [root@...i7 ~]# ip link set team0 up
>> Killed
>> 
>> BUG: unable to handle kernel NULL pointer dereference at           (null)
>> IP: [<          (null)>]           (null)
>> PGD 18ee5b067 PUD 18d9cd067 PMD 0
>> Oops: 0010 [#1] SMP
>> d_timer snd soundcore snd_page_alloc pl2303 usbserial iTCO_wdt iTCO_vendor_support raid0 i2c_i801 pcspkr microcode serio_raw uinput floppy joydev ipv6 autofs4 ata_generic firewire_ohci pata_acpi firewire_core crc_itu_t pata_marvell nouveau ttm drm_kms_helper drm hwmon i2c_algo_bit i2c_core mxm_wmi wmi video [last unloaded: scsi_wait_scan]
>> 
>> Pid: 21877, comm: ip Not tainted 3.2.0-rc1-10901-g40709d7 #31                  /DX58SO
>> RIP: 0010:[<0000000000000000>]  [<          (null)>]           (null)
>> RSP: 0018:ffff88018eecd6a0  EFLAGS: 00010283
>> RAX: ffffffffa02a4370 RBX: ffff8801a4d04500 RCX: 0000000000000e7f
>> RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff880198356000
>> RBP: ffff88018eecd6d8 R08: 0000000000000001 R09: 0000000000000000
>> R10: 0000000000000000 R11: ffff880181d57600 R12: 0000000000000000
>> R13: ffff8801a526f7d8 R14: ffffffffa032f0c0 R15: 0000000000000000
>> FS:  00007f52ae475700(0000) GS:ffff8801afcc0000(0000) knlGS:0000000000000000
>> CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
>> CR2: 0000000000000000 CR3: 00000001983ab000 CR4: 00000000000006e0
>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
>> Process ip (pid: 21877, threadinfo ffff88018eecc000, task ffff88018db8aea0)
>>
>
>I patched the kernel to test if there is ops->ndo_vlan_rx_add_vid before
>call it and works out, no more oopses.

Yes, this should be checked. I missed that. I would like to address this
as follow up patch because I'm sure it's not the last bug in team (I
would be sending Vx of the patch for long time :( )

>
>Well, as there is no active-backup daemon yet (right?), only the link
>notification is sent to team_monitor when I remove the cable from the
>NIC, so I have to switch manually active and backup slaves.

Correct. I plan to do very simple active-backup daemon written in python
in matter of days. Keep pulling libteam git.

>
>ping -f, ssh, and a script to change active slave every second are 
>running in parallel. 
>
>I haven't noticed any other issue so far.

Thanks for testing this Flavio!

Jirka

>fbl
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