Re: [PATCH net-next v2] net/sched: actions report errors with extack

[Stephen Hemminger]

On Fri, 9 Feb 2024 13:41:12 -0800
Jakub Kicinski <kuba@xxxxxxxxxx> wrote:

> On Fri, 9 Feb 2024 13:11:19 -0800 Stephen Hemminger wrote:
> > On Thu, 8 Feb 2024 18:27:31 -0800
> > Jakub Kicinski <kuba@xxxxxxxxxx> wrote:
> >   
> > > > -	if (!tb[TCA_ACT_BPF_PARMS])
> > > > +	if (NL_REQ_ATTR_CHECK(extack, nla, tb, TCA_ACT_BPF_PARMS)) {
> > > > +		NL_SET_ERR_MSG(extack, "Missing required attribute");      
> > > 
> > > Please fix the userspace to support missing attr parsing instead.    
> > 
> > I was just addressing the error handling. This keeps the same impact as
> > before, i.e no userspace API change.  
> 
> I mean that NL_REQ_ATTR_CHECK() should be more than enough by itself.
> We have full TC specs in YAML now, we can hack up a script to generate
> reverse parsing tables for iproute2 even if you don't want to go full
> YNL.

Ok, then will take the err msg across all places using NL_REQ_ATTR_CHECK?

Would prefer not to add the complexity of reverse parsing tables, that gets ugly fast.