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

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Message-ID: <20200420174124.GS6581@nanopsycho.orion>
Date:   Mon, 20 Apr 2020 19:41:24 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     David Ahern <dsahern@...il.com>
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

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.

Do you have usecase for any other non-lag master type device?
Note the ndo name can change whenever needed. I think the name should
reflect the usage.