linux-kernel - Re: [net-next,v4,05/13] octeontx2-af: npc: cn20k: Allocate default MCAM indexes

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Message-ID: <20260119093245.0544f5ce@kernel.org>
Date: Mon, 19 Jan 2026 09:32:45 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Ratheesh Kannoth <rkannoth@...vell.com>
Cc: <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: Re: [net-next,v4,05/13] octeontx2-af: npc: cn20k: Allocate default
 MCAM indexes

On Mon, 19 Jan 2026 09:12:32 +0530 Ratheesh Kannoth wrote:
> > > -	if (attach->nixlf)
> > > +	if (attach->nixlf) {
> > >  		rvu_attach_block(rvu, pcifunc, BLKTYPE_NIX, 1, attach);
> > > +		if (is_cn20k(rvu->pdev)) {
> > > +			err = npc_cn20k_dft_rules_alloc(rvu, pcifunc);
> > > +			if (err)
> > > +				goto exit;  
> >                         ^^^^
> >
> > When npc_cn20k_dft_rules_alloc() fails after rvu_attach_block() has
> > already attached the NIX LF, the error path jumps to exit without
> > detaching NIX. The caller (otx2_init_rsrc in otx2_pf.c) assumes that on
> > error nothing was attached, so it does not call otx2_detach_resources().
> >
> > Could this leave NIX LF attached without proper cleanup on allocation
> > failure?  
> There is no proper error handling done for rvu_attach_block function (in existing code)
> We can address this later as different patch ?

Different patch, yes, but _before_ these patches are merged.