linux-kernel - Re: [PATCH net-next 07/12] xsk: add generic XSk &xdp

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Message-ID: <20241212181944.37ca3888@kernel.org>
Date: Thu, 12 Dec 2024 18:19:44 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Alexander Lobakin <aleksander.lobakin@...el.com>
Cc: Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni
 <pabeni@...hat.com>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann
 <daniel@...earbox.net>, John Fastabend <john.fastabend@...il.com>, Andrii
 Nakryiko <andrii@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Josh
 Poimboeuf <jpoimboe@...nel.org>, "Jose E. Marchesi"
 <jose.marchesi@...cle.com>, Toke Høiland-Jørgensen
 <toke@...hat.com>, Magnus Karlsson <magnus.karlsson@...el.com>, Maciej
 Fijalkowski <maciej.fijalkowski@...el.com>, Przemek Kitszel
 <przemyslaw.kitszel@...el.com>, Jason Baron <jbaron@...mai.com>, Casey
 Schaufler <casey@...aufler-ca.com>, Nathan Chancellor <nathan@...nel.org>,
 nex.sw.ncis.osdt.itp.upstreaming@...el.com, bpf@...r.kernel.org,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 07/12] xsk: add generic XSk &xdp_buff -> skb
 conversion

On Wed, 11 Dec 2024 18:26:44 +0100 Alexander Lobakin wrote:
> +#else /* !CONFIG_PAGE_POOL */
> +	struct napi_struct *napi;
> +
> +	pp = NULL;
> +	napi = napi_by_id(rxq->napi_id);
> +	if (likely(napi))
> +		skb = napi_alloc_skb(napi, len);
> +	else
> +		skb = __netdev_alloc_skb_ip_align(rxq->dev, len,
> +						  GFP_ATOMIC | __GFP_NOWARN);
> +	if (unlikely(!skb))
> +		return NULL;
> +#endif /* !CONFIG_PAGE_POOL */

What are the chances of having a driver with AF_XDP support 
and without page pool support? I think it's zero :S
Can we kill all the if !CONFIG_PAGE_POOL sections and hide
the entire helper under if CONFIG_PAGE_POLL ?