netdev - Re: [PATCH V2 mlx5-next 01/10] net/core: Introduce master_xmit_slave

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Date:   Mon, 20 Apr 2020 11:56:58 -0600
From:   David Ahern <dsahern@...il.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     Maor Gottlieb <maorg@...lanox.com>, davem@...emloft.net,
        jgg@...lanox.com, dledford@...hat.com, j.vosburgh@...il.com,
        vfalico@...il.com, andy@...yhouse.net, kuba@...nel.org,
        leonro@...lanox.com, saeedm@...lanox.com, jiri@...lanox.com,
        linux-rdma@...r.kernel.org, netdev@...r.kernel.org,
        alexr@...lanox.com
Subject: Re: [PATCH V2 mlx5-next 01/10] net/core: Introduce
 master_xmit_slave_get

On 4/20/20 11:54 AM, Jiri Pirko wrote:
> Mon, Apr 20, 2020 at 07:29:15PM CEST, dsahern@...il.com wrote:
>> On 4/20/20 8:01 AM, Jiri Pirko wrote:
>>> Mon, Apr 20, 2020 at 09:54:17AM CEST, maorg@...lanox.com wrote:
>>>> Add new ndo to get the xmit slave of master device.
>>>> User should release the slave when it's not longer needed.
>>>> When slave selection method is based on hash, then the user can ask to
>>>> get the xmit slave assume all the slaves can transmit by setting the
>>>> LAG_FLAGS_HASH_ALL_SLAVES bit in the flags argument.
>>>>
>>>> Signed-off-by: Maor Gottlieb <maorg@...lanox.com>
>>>> ---
>>>> include/linux/netdevice.h |  3 +++
>>>> include/net/lag.h         | 32 ++++++++++++++++++++++++++++++++
>>>> 2 files changed, 35 insertions(+)
>>>>
>>>> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
>>>> index 130a668049ab..e8852f3ad0b6 100644
>>>> --- a/include/linux/netdevice.h
>>>> +++ b/include/linux/netdevice.h
>>>> @@ -1389,6 +1389,9 @@ struct net_device_ops {
>>>> 						 struct netlink_ext_ack *extack);
>>>> 	int			(*ndo_del_slave)(struct net_device *dev,
>>>> 						 struct net_device *slave_dev);
>>>> +	struct net_device*	(*ndo_xmit_get_slave)(struct net_device *master_dev,
>>>> +						      struct sk_buff *skb,
>>>> +						      u16 flags);
>>>
>>> Please adjust the name to:
>>> ndo_get_lag_xmit_slave
>>
>> I disagree. There are multiple master devices and no reason to have a
>> LAG specific get_slave.
> 
> Btw, did you notice that Maor is passing "lag" named values in the flags?
> 

yes. I disagree with enum name, but having LAG in the name of a flag is
fine. To me that is the right place for a LAG specific request of a
generic ndo in core code.