netdev - Re: [PATCH V6 mlx5-next 11/16] RDMA/core: Add LAG functionality

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Date:   Wed, 29 Apr 2020 12:01:43 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Maor Gottlieb <maorg@...lanox.com>
Cc:     davem@...emloft.net, dledford@...hat.com, j.vosburgh@...il.com,
        vfalico@...il.com, andy@...yhouse.net, kuba@...nel.org,
        jiri@...lanox.com, dsahern@...nel.org, leonro@...lanox.com,
        saeedm@...lanox.com, linux-rdma@...r.kernel.org,
        netdev@...r.kernel.org, alexr@...lanox.com
Subject: Re: [PATCH V6 mlx5-next 11/16] RDMA/core: Add LAG functionality

On Wed, Apr 29, 2020 at 12:01:07PM +0300, Maor Gottlieb wrote:
> 
> On 4/29/2020 2:30 AM, Jason Gunthorpe wrote:
> > On Tue, Apr 28, 2020 at 08:15:25PM -0300, Jason Gunthorpe wrote:
> > > On Sun, Apr 26, 2020 at 10:17:12AM +0300, Maor Gottlieb wrote:
> > > > +int rdma_lag_get_ah_roce_slave(struct ib_device *device,
> > > > +			       struct rdma_ah_attr *ah_attr,
> > > > +			       struct net_device **xmit_slave)
> > > Please do not use ** and also return int. The function should return
> > > net_device directly and use ERR_PTR()
> 
> How about return NULL in failure as well (will add debug print)? Not fail
> the flow if we didn't succeed to get the slave, let the lower driver to do
> it if it would like to.

A NULL return indicating success but 'not found' is fine.

Jason