netdev - Re: [PATCH net-next 03/24] net: Use __napi_alloc_frag

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Date: Mon, 18 Dec 2023 08:48:56 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>, 
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>, Boqun Feng
 <boqun.feng@...il.com>,  Daniel Borkmann <daniel@...earbox.net>, Eric
 Dumazet <edumazet@...gle.com>, Frederic Weisbecker <frederic@...nel.org>,
 Ingo Molnar <mingo@...hat.com>, Jakub Kicinski <kuba@...nel.org>, Peter
 Zijlstra <peterz@...radead.org>, Thomas Gleixner <tglx@...utronix.de>,
 Waiman Long <longman@...hat.com>, Will Deacon <will@...nel.org>
Subject: Re: [PATCH net-next 03/24] net: Use __napi_alloc_frag_align()
 instead of open coding it.

On Fri, 2023-12-15 at 18:07 +0100, Sebastian Andrzej Siewior wrote:
> The else condition within __netdev_alloc_frag_align() is an open coded
> __napi_alloc_frag_align().
> 
> Use __napi_alloc_frag_align() instead of open coding it.
> 
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> ---
>  net/core/skbuff.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> index b157efea5dea8..de9397e45718a 100644
> --- a/net/core/skbuff.c
> +++ b/net/core/skbuff.c
> @@ -311,11 +311,8 @@ void *__netdev_alloc_frag_align(unsigned int fragsz, unsigned int align_mask)
>  
>  		data = page_frag_alloc_align(nc, fragsz, GFP_ATOMIC, align_mask);
>  	} else {
> -		struct napi_alloc_cache *nc;
> -
>  		local_bh_disable();
> -		nc = this_cpu_ptr(&napi_alloc_cache);
> -		data = page_frag_alloc_align(&nc->page, fragsz, GFP_ATOMIC, align_mask);

There is a:

	fragsz = SKB_DATA_ALIGN(fragsz);

statement just before the enclosing 'if'. I would consider moving such
assignment inside the 'then' branch - since __napi_alloc_frag_align()
already include that.

/P