netdev - Re: [PATCH net-next v1 1/2] page_pool: reintroduce page_pool_unlink

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Date: Tue, 25 Jun 2024 17:10:32 -0700
From: David Wei <dw@...idwei.uk>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Michael Chan <michael.chan@...adcom.com>,
 Andy Gospodarek <andrew.gospodarek@...adcom.com>,
 Jesper Dangaard Brouer <hawk@...nel.org>,
 Ilias Apalodimas <ilias.apalodimas@...aro.org>, netdev@...r.kernel.org,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH net-next v1 1/2] page_pool: reintroduce
 page_pool_unlink_napi()

On 2024-06-25 16:39, Jakub Kicinski wrote:
> On Tue, 25 Jun 2024 12:55:21 -0700 David Wei wrote:
>>  #ifdef CONFIG_PAGE_POOL
>> +void page_pool_unlink_napi(struct page_pool *pool);
>>  void page_pool_destroy(struct page_pool *pool);
>>  void page_pool_use_xdp_mem(struct page_pool *pool, void (*disconnect)(void *),
>>  			   const struct xdp_mem_info *mem);
>>  void page_pool_put_page_bulk(struct page_pool *pool, void **data,
>>  			     int count);
>>  #else
>> +static inline void page_pool_unlink_napi(struct page_pool *pool)
>> +{
>> +}
> 
> All callers must select PAGE_POOL, I don't think we need the empty
> static inline in this particular case.

Got it, I'll remove this.

> 
>>  static inline void page_pool_destroy(struct page_pool *pool)
>>  {
>>  }
>> diff --git a/net/core/page_pool.c b/net/core/page_pool.c
>> index 3927a0a7fa9a..ec274dde0e32 100644
>> --- a/net/core/page_pool.c
>> +++ b/net/core/page_pool.c
>> @@ -1021,6 +1021,11 @@ static void page_pool_disable_direct_recycling(struct page_pool *pool)
>>  	 */
>>  	WRITE_ONCE(pool->cpuid, -1);
>>  
>> +	page_pool_unlink_napi(pool);
> 
> No need to split page_pool_disable_direct_recycling()
> into two, we can write cpuid, it won't hurt.

Ah, I see.

> 
> The purpose of the function didn't really change when Olek
> renamed it. Unlinking NAPI is also precisely to prevent recycling.
> So you can either export page_pool_disable_direct_recycling()
> add a wrapper called page_pool_unlink_napi(), or come up with
> another name... But there's no need to split it.

Thanks for the suggestions. I'll export
page_pool_disable_direct_recycling().

> 
>> +}
>> +
>> +void page_pool_unlink_napi(struct page_pool *pool)
>> +{
>>  	if (!pool->p.napi)
>>  		return;
>>  
>> @@ -1032,6 +1037,7 @@ static void p