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Date: Thu, 11 Jun 2026 13:39:10 -0700
From: Jakub Kicinski <kuba@kernel.org>
To: Florian Westphal <fw@strlen.de>
Cc: <netdev@vger.kernel.org>, <netfilter-devel@vger.kernel.org>
Subject: Re: [PATCH net-next 1/2] netdevsim: tc: allow to test nf_tables
 offload control plane code
Message-ID: <20260611133910.2887266f@kernel.org>
In-Reply-To: <20260610175906.1767-2-fw@strlen.de>
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	<20260610175906.1767-2-fw@strlen.de>
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On Wed, 10 Jun 2026 19:58:43 +0200 Florian Westphal wrote:
> @@ -73,7 +86,10 @@ nsim_setup_tc(struct net_device *dev, enum tc_setup_type type, void *type_data)
>  						  &nsim_block_cb_list,
>  						  nsim_setup_tc_block_cb,
>  						  ns, ns, true);
> +	case TC_SETUP_FT:
> +		return 0;
>  	default:
>  		return -EOPNOTSUPP;
>  	}
>  }
> +ALLOW_ERROR_INJECTION(nsim_setup_tc, ERRNO);

As you probably seen other netdevsim offloads use explicit debugfs 
files to "fail operation X". Slightly easier to deal with, and
netdevsim is a test harness anyway. But entirely up to you.