Re: [PATCHv2 net] team: team_port_add should check link_up before enable port

[Xin Long <lucien.xin@gmail.com>]

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On Tue, Dec 6, 2016 at 4:22 PM, Jiri Pirko <jiri@resnulli.us> wrote:
> Tue, Dec 06, 2016 at 08:29:08AM CET, lucien.xin@gmail.com wrote:
>>Now when users add a nic to team dev, the option 'enable' of the port
>>is true by default, as team_port_enable enables it after dev_open in
>>team_port_add.
>>
>>But even if the port_dev has no carrier, like it's cable was unpluged,
>>the port is still enabled. It leads to that team dev couldn't work well
>>if this port was chosen to connect, and has no chance to change to use
>>other ports if link_watch is ethtool.
>>
>>This patch is to enable the port only when the port_dev has carrier in
>>team_port_add.
>>
>>v1 -> v2:
>>  use netif_carrier_ok() instead of !!netif_carrier_ok(), as it returns
>>  bool now.
>>
>>Signed-off-by: Xin Long <lucien.xin@gmail.com>
>>---
>> drivers/net/team/team.c | 8 ++++++--
>> 1 file changed, 6 insertions(+), 2 deletions(-)
>>
>>diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
>>index a380649..4bc0103 100644
>>--- a/drivers/net/team/team.c
>>+++ b/drivers/net/team/team.c
>>@@ -1140,6 +1140,7 @@ static int team_port_add(struct team *team, struct net_device *port_dev)
>>       struct net_device *dev = team->dev;
>>       struct team_port *port;
>>       char *portname = port_dev->name;
>>+      bool linkup;
>>       int err;
>>
>>       if (port_dev->flags & IFF_LOOPBACK) {
>>@@ -1249,9 +1250,12 @@ static int team_port_add(struct team *team, struct net_device *port_dev)
>>
>>       port->index = -1;
>>       list_add_tail_rcu(&port->list, &team->port_list);
>>-      team_port_enable(team, port);
>>+      linkup = netif_carrier_ok(port_dev);
>>+      if (linkup)
>>+              team_port_enable(team, port);
>
> This is obviously wrong change. It you use a simple setup without
> userspace part (e.g. round robin), The port gets never enabled.
> team_port_enabl is called from here and team_port_en_option_set.
yes, without userspace part, that would be a problem.

>
> By default, all ports should be enabled. Only in case the userspace
> daemon decides to disable, it does so.
>
> Could you send me the exact configuration where you see the issue?
attachment is the scripts,

# ./setup.sh
# ip netns exec ns1 ./team1.sh
# ./team0.sh
# ping 192.168.11.3

the issue is team0 cannot switch to veth2, even if the veth0 has no carrier.

> This should be definitelly fixed in user part.
now it can disable/enable it in lw_ethtool_event_watch_port_changed()
when receive event from kernel, but at the beginning, the first event from
adding port will not going to team_port_en_option_set, as new_link_up
== common_ppriv->link_up in lw_ethtool_event_watch_port_changed().

maybe it should be fixed there ?

>
> Thanks.

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