netdev - Re: [PATCH net] team: team_port_add should check link

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Message-ID: <CADvbK_fbFOhbNs3zs25kwRkJBbMuyvd3NBiBmw1t6H0YMEUjrw@mail.gmail.com>
Date:   Tue, 6 Dec 2016 14:54:28 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Cc:     network dev <netdev@...r.kernel.org>, davem <davem@...emloft.net>,
        Jiri Pirko <jiri@...nulli.us>
Subject: Re: [PATCH net] team: team_port_add should check link_up before
 enable port

On Sat, Dec 3, 2016 at 10:57 PM, Marcelo Ricardo Leitner
<marcelo.leitner@...il.com> wrote:
> On Sat, Dec 03, 2016 at 09:42:11PM +0800, Xin Long 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.
>>
>> Signed-off-by: Xin Long <lucien.xin@...il.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..42004ac 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);
>
> The !! here is not needed anymore, netif_carrier_ok already returns a
> bool.
> static inline bool netif_carrier_ok(const struct net_device *dev)
will repost, thanks.

>
>
>> +     if (linkup)
>> +             team_port_enable(team, port);
>> +
>>       __team_compute_features(team);
>> -     __team_port_change_port_added(port, !!netif_carrier_ok(port_dev));
>> +     __team_port_change_port_added(port, linkup);
>>       __team_options_change_check(team);
>>
>>       netdev_info(dev, "Port device %s added\n", portname);
>> --
>> 2.1.0
>>