netdev - Re: [PATCH net 05/10] net: xdp: don't allow device-bound programs in driver mode

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Message-ID: <20171120140211.2c59595b@cakuba.netronome.com>
Date:   Mon, 20 Nov 2017 14:02:11 -0800
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     David Ahern <dsahern@...il.com>
Cc:     netdev@...r.kernel.org, alexei.starovoitov@...il.com,
        daniel@...earbox.net
Subject: Re: [PATCH net 05/10] net: xdp: don't allow device-bound programs
 in driver mode

On Mon, 20 Nov 2017 07:36:39 -0700, David Ahern wrote:
> On 11/19/17 9:55 PM, Jakub Kicinski wrote:
> > diff --git a/net/core/dev.c b/net/core/dev.c
> > index 09525a27319c..21de2d37a0ba 100644
> > --- a/net/core/dev.c
> > +++ b/net/core/dev.c
> > @@ -7143,6 +7143,13 @@ int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack,
> >  					     bpf_op == ops->ndo_bpf);
> >  		if (IS_ERR(prog))
> >  			return PTR_ERR(prog);
> > +
> > +		if (!(flags & XDP_FLAGS_HW_MODE) &&
> > +		    bpf_prog_is_dev_bound(prog->aux)) {
> > +			NL_SET_ERR_MSG_MOD(extack, "using device-bound program without HW_MODE flag not supported");  
> 
> I don't see dev_change_xdp_fd called by device drivers, so that should
> just be NL_SET_ERR_MSG. Also, "is not supported" sounds better to me
> than just "not supported".

Thanks, I'll give others a couple more hours and respin!