netdev - Re: [PATCH v6 net-next 1/5] net: add generic per-cpu page

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Message-ID: <ZbefjZvKUMtaCbm1@lore-desk>
Date: Mon, 29 Jan 2024 13:52:29 +0100
From: Lorenzo Bianconi <lorenzo.bianconi@...hat.com>
To: Toke Høiland-Jørgensen <toke@...hat.com>
Cc: Lorenzo Bianconi <lorenzo@...nel.org>, netdev@...r.kernel.org,
	davem@...emloft.net, kuba@...nel.org, edumazet@...gle.com,
	pabeni@...hat.com, bpf@...r.kernel.org,
	willemdebruijn.kernel@...il.com, jasowang@...hat.com,
	sdf@...gle.com, hawk@...nel.org, ilias.apalodimas@...aro.org
Subject: Re: [PATCH v6 net-next 1/5] net: add generic per-cpu page_pool
 allocator

> Lorenzo Bianconi <lorenzo@...nel.org> writes:
> 
> > Introduce generic percpu page_pools allocator.
> > Moreover add page_pool_create_percpu() and cpuid filed in page_pool struct
> > in order to recycle the page in the page_pool "hot" cache if
> > napi_pp_put_page() is running on the same cpu.
> > This is a preliminary patch to add xdp multi-buff support for xdp running
> > in generic mode.
> >
> > Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> > ---
> >  include/net/page_pool/types.h |  3 +++
> >  net/core/dev.c                | 40 +++++++++++++++++++++++++++++++++++
> >  net/core/page_pool.c          | 23 ++++++++++++++++----
> >  net/core/skbuff.c             |  5 +++--
> >  4 files changed, 65 insertions(+), 6 deletions(-)
> >
> > diff --git a/include/net/page_pool/types.h b/include/net/page_pool/types.h
> > index 76481c465375..3828396ae60c 100644
> > --- a/include/net/page_pool/types.h
> > +++ b/include/net/page_pool/types.h
> > @@ -128,6 +128,7 @@ struct page_pool_stats {
> >  struct page_pool {
> >  	struct page_pool_params_fast p;
> >  
> > +	int cpuid;
> >  	bool has_init_callback;
> >  
> >  	long frag_users;
> > @@ -203,6 +204,8 @@ struct page *page_pool_alloc_pages(struct page_pool *pool, gfp_t gfp);
> >  struct page *page_pool_alloc_frag(struct page_pool *pool, unsigned int *offset,
> >  				  unsigned int size, gfp_t gfp);
> >  struct page_pool *page_pool_create(const struct page_pool_params *params);
> > +struct page_pool *page_pool_create_percpu(const struct page_pool_params *params,
> > +					  int cpuid);
> >  
> >  struct xdp_mem_info;
> >  
> > diff --git a/net/core/dev.c b/net/core/dev.c
> > index cb2dab0feee0..bf9ec740b09a 100644
> > --- a/net/core/dev.c
> > +++ b/net/core/dev.c
> > @@ -153,6 +153,8 @@
> >  #include <linux/prandom.h>
> >  #include <linux/once_lite.h>
> >  #include <net/netdev_rx_queue.h>
> > +#include <net/page_pool/types.h>
> > +#include <net/page_pool/helpers.h>
> >  
> >  #include "dev.h"
> >  #include "net-sysfs.h"
> > @@ -442,6 +444,8 @@ static RAW_NOTIFIER_HEAD(netdev_chain);
> >  DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
> >  EXPORT_PER_CPU_SYMBOL(softnet_data);
> >  
> > +DEFINE_PER_CPU_ALIGNED(struct page_pool *, page_pool);
> 
> I think we should come up with a better name than just "page_pool" for
> this global var. In the code below it looks like it's a local variable
> that's being referenced. Maybe "global_page_pool" or "system_page_pool"
> or something along those lines?

ack, I will fix it. system_page_pool seems better, agree?

Regards,
Lorenzo

> 
> -Toke
> 

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