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Message-ID: <CAC_iWjJQ0H90xfD1Jq-DZTPC-GwOh+WMiC24=HnerEkqbF=FDA@mail.gmail.com>
Date: Tue, 13 Feb 2024 09:33:58 +0200
From: Ilias Apalodimas <ilias.apalodimas@...aro.org>
To: Lorenzo Bianconi <lorenzo@...nel.org>
Cc: netdev@...r.kernel.org, lorenzo.bianconi@...hat.com, davem@...emloft.net,
kuba@...nel.org, edumazet@...gle.com, pabeni@...hat.com, bpf@...r.kernel.org,
toke@...hat.com, willemdebruijn.kernel@...il.com, jasowang@...hat.com,
sdf@...gle.com, hawk@...nel.org, linyunsheng@...wei.com
Subject: Re: [PATCH v8 net-next 1/4] net: add generic percpu page_pool allocator
On Mon, 5 Feb 2024 at 13:35, Lorenzo Bianconi <lorenzo@...nel.org> wrote:
>
> 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.
>
> Acked-by: Jesper Dangaard Brouer <hawk@...nel.org>
> Reviewed-by: Toke Hoiland-Jorgensen <toke@...hat.com>
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> ---
> include/net/page_pool/types.h | 3 +++
> net/core/dev.c | 45 +++++++++++++++++++++++++++++++++++
> net/core/page_pool.c | 23 ++++++++++++++----
> net/core/skbuff.c | 5 ++--
> 4 files changed, 70 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 27ba057d06c4..235421d313c3 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"
> @@ -450,6 +452,12 @@ static RAW_NOTIFIER_HEAD(netdev_chain);
> DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
> EXPORT_PER_CPU_SYMBOL(softnet_data);
>
> +/* Page_pool has a lockless array/stack to alloc/recycle pages.
> + * PP consumers must pay attention to run APIs in the appropriate context
> + * (e.g. NAPI context).
> + */
> +static DEFINE_PER_CPU_ALIGNED(struct page_pool *, system_page_pool);
> +
> #ifdef CONFIG_LOCKDEP
> /*
> * register_netdevice() inits txq->_xmit_lock and sets lockdep class
> @@ -11697,6 +11705,27 @@ static void __init net_dev_struct_check(void)
> *
> */
>
> +/* We allocate 256 pages for each CPU if PAGE_SHIFT is 12 */
> +#define SYSTEM_PERCPU_PAGE_POOL_SIZE ((1 << 20) / PAGE_SIZE)
> +
> +static int net_page_pool_create(int cpuid)
> +{
> +#if IS_ENABLED(CONFIG_PAGE_POOL)
> + struct page_pool_params page_pool_params = {
> + .pool_size = SYSTEM_PERCPU_PAGE_POOL_SIZE,
> + .nid = NUMA_NO_NODE,
> + };
> + struct page_pool *pp_ptr;
> +
> + pp_ptr = page_pool_create_percpu(&page_pool_params, cpuid);
> + if (IS_ERR(pp_ptr))
> + return -ENOMEM;
> +
> + per_cpu(system_page_pool, cpuid) = pp_ptr;
> +#endif
> + return 0;
> +}
> +
> /*
> * This is called single threaded during boot, so no need
> * to take the rtnl semaphore.
> @@ -11749,6 +11778,9 @@ static int __init net_dev_init(void)
> init_gro_hash(&sd->backlog);
> sd->backlog.poll = process_backlog;
> sd->backlog.weight = weight_p;
> +
> + if (net_page_pool_create(i))
> + goto out;
> }
>
> dev_boot_phase = 0;
> @@ -11776,6 +11808,19 @@ static int __init net_dev_init(void)
> WARN_ON(rc < 0);
> rc = 0;
> out:
> + if (rc < 0) {
> + for_each_possible_cpu(i) {
> + struct page_pool *pp_ptr;
> +
> + pp_ptr = per_cpu(system_page_pool, i);
> + if (!pp_ptr)
> + continue;
> +
> + page_pool_destroy(pp_ptr);
> + per_cpu(system_page_pool, i) = NULL;
> + }
> + }
> +
> return rc;
> }
>
> diff --git a/net/core/page_pool.c b/net/core/page_pool.c
> index 4933762e5a6b..89c835fcf094 100644
> --- a/net/core/page_pool.c
> +++ b/net/core/page_pool.c
> @@ -171,13 +171,16 @@ static void page_pool_producer_unlock(struct page_pool *pool,
> }
>
> static int page_pool_init(struct page_pool *pool,
> - const struct page_pool_params *params)
> + const struct page_pool_params *params,
> + int cpuid)
> {
> unsigned int ring_qsize = 1024; /* Default */
>
> memcpy(&pool->p, ¶ms->fast, sizeof(pool->p));
> memcpy(&pool->slow, ¶ms->slow, sizeof(pool->slow));
>
> + pool->cpuid = cpuid;
> +
> /* Validate only known flags were used */
> if (pool->p.flags & ~(PP_FLAG_ALL))
> return -EINVAL;
> @@ -253,10 +256,12 @@ static void page_pool_uninit(struct page_pool *pool)
> }
>
> /**
> - * page_pool_create() - create a page pool.
> + * page_pool_create_percpu() - create a page pool for a given cpu.
> * @params: parameters, see struct page_pool_params
> + * @cpuid: cpu identifier
> */
> -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 page_pool *pool;
> int err;
> @@ -265,7 +270,7 @@ struct page_pool *page_pool_create(const struct page_pool_params *params)
> if (!pool)
> return ERR_PTR(-ENOMEM);
>
> - err = page_pool_init(pool, params);
> + err = page_pool_init(pool, params, cpuid);
> if (err < 0)
> goto err_free;
>
> @@ -282,6 +287,16 @@ struct page_pool *page_pool_create(const struct page_pool_params *params)
> kfree(pool);
> return ERR_PTR(err);
> }
> +EXPORT_SYMBOL(page_pool_create_percpu);
> +
> +/**
> + * page_pool_create() - create a page pool
> + * @params: parameters, see struct page_pool_params
> + */
> +struct page_pool *page_pool_create(const struct page_pool_params *params)
> +{
> + return page_pool_create_percpu(params, -1);
> +}
> EXPORT_SYMBOL(page_pool_create);
>
> static void page_pool_return_page(struct page_pool *pool, struct page *page);
> diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> index edbbef563d4d..9e5eb47b4025 100644
> --- a/net/core/skbuff.c
> +++ b/net/core/skbuff.c
> @@ -923,9 +923,10 @@ bool napi_pp_put_page(struct page *page, bool napi_safe)
> */
> if (napi_safe || in_softirq()) {
> const struct napi_struct *napi = READ_ONCE(pp->p.napi);
> + unsigned int cpuid = smp_processor_id();
>
> - allow_direct = napi &&
> - READ_ONCE(napi->list_owner) == smp_processor_id();
> + allow_direct = napi && READ_ONCE(napi->list_owner) == cpuid;
> + allow_direct |= (pp->cpuid == cpuid);
> }
>
> /* Driver set this to memory recycling info. Reset it on recycle.
> --
> 2.43.0
>
Acked-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>
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