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Message-ID: <Y70vqm/HlRvqL2Uv@hera>
Date: Tue, 10 Jan 2023 11:28:10 +0200
From: Ilias Apalodimas <ilias.apalodimas@...aro.org>
To: "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc: Jesper Dangaard Brouer <hawk@...nel.org>, netdev@...r.kernel.org,
linux-mm@...ck.org, Shakeel Butt <shakeelb@...gle.com>
Subject: Re: [PATCH v2 04/24] page_pool: Convert page_pool_release_page() to
page_pool_release_netmem()
Hi Matthew,
On Thu, Jan 05, 2023 at 09:46:11PM +0000, Matthew Wilcox (Oracle) wrote:
> Also convert page_pool_clear_pp_info() and trace_page_pool_state_release()
> to take a netmem. Include a wrapper for page_pool_release_page() to
> avoid converting all callers.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> ---
> include/net/page_pool.h | 14 ++++++++++----
> include/trace/events/page_pool.h | 14 +++++++-------
> net/core/page_pool.c | 18 +++++++++---------
> 3 files changed, 26 insertions(+), 20 deletions(-)
>
> diff --git a/include/net/page_pool.h b/include/net/page_pool.h
> index 196b585763d9..480baa22bc50 100644
> --- a/include/net/page_pool.h
> +++ b/include/net/page_pool.h
> @@ -18,7 +18,7 @@
> *
> * API keeps track of in-flight pages, in-order to let API user know
> * when it is safe to dealloactor page_pool object. Thus, API users
> - * must make sure to call page_pool_release_page() when a page is
> + * must make sure to call page_pool_release_netmem() when a page is
> * "leaving" the page_pool. Or call page_pool_put_page() where
> * appropiate. For maintaining correct accounting.
> *
> @@ -354,7 +354,7 @@ struct xdp_mem_info;
> void page_pool_destroy(struct page_pool *pool);
> void page_pool_use_xdp_mem(struct page_pool *pool, void (*disconnect)(void *),
> struct xdp_mem_info *mem);
> -void page_pool_release_page(struct page_pool *pool, struct page *page);
> +void page_pool_release_netmem(struct page_pool *pool, struct netmem *nmem);
> void page_pool_put_page_bulk(struct page_pool *pool, void **data,
> int count);
> #else
> @@ -367,8 +367,8 @@ static inline void page_pool_use_xdp_mem(struct page_pool *pool,
> struct xdp_mem_info *mem)
> {
> }
> -static inline void page_pool_release_page(struct page_pool *pool,
> - struct page *page)
> +static inline void page_pool_release_netmem(struct page_pool *pool,
> + struct netmem *nmem)
> {
> }
>
> @@ -378,6 +378,12 @@ static inline void page_pool_put_page_bulk(struct page_pool *pool, void **data,
> }
> #endif
>
I think it's worth commenting here that page_pool_release_page() is
eventually going to be removed once we convert all drivers and shouldn't
be used anymore
> +static inline void page_pool_release_page(struct page_pool *pool,
> + struct page *page)
> +{
> + page_pool_release_netmem(pool, page_netmem(page));
> +}
> +
> void page_pool_put_defragged_page(struct page_pool *pool, struct page *page,
> unsigned int dma_sync_size,
> bool allow_direct);
> diff --git a/include/trace/events/page_pool.h b/include/trace/events/page_pool.h
> index ca534501158b..113aad0c9e5b 100644
> --- a/include/trace/events/page_pool.h
> +++ b/include/trace/events/page_pool.h
> @@ -42,26 +42,26 @@ TRACE_EVENT(page_pool_release,
> TRACE_EVENT(page_pool_state_release,
>
> TP_PROTO(const struct page_pool *pool,
> - const struct page *page, u32 release),
> + const struct netmem *nmem, u32 release),
>
> - TP_ARGS(pool, page, release),
> + TP_ARGS(pool, nmem, release),
>
> TP_STRUCT__entry(
> __field(const struct page_pool *, pool)
> - __field(const struct page *, page)
> + __field(const struct netmem *, nmem)
> __field(u32, release)
> __field(unsigned long, pfn)
> ),
>
> TP_fast_assign(
> __entry->pool = pool;
> - __entry->page = page;
> + __entry->nmem = nmem;
> __entry->release = release;
> - __entry->pfn = page_to_pfn(page);
> + __entry->pfn = netmem_pfn(nmem);
> ),
>
> - TP_printk("page_pool=%p page=%p pfn=0x%lx release=%u",
> - __entry->pool, __entry->page, __entry->pfn, __entry->release)
> + TP_printk("page_pool=%p nmem=%p pfn=0x%lx release=%u",
> + __entry->pool, __entry->nmem, __entry->pfn, __entry->release)
> );
>
> TRACE_EVENT(page_pool_state_hold,
> diff --git a/net/core/page_pool.c b/net/core/page_pool.c
> index 9b203d8660e4..437241aba5a7 100644
> --- a/net/core/page_pool.c
> +++ b/net/core/page_pool.c
> @@ -336,10 +336,10 @@ static void page_pool_set_pp_info(struct page_pool *pool,
> pool->p.init_callback(page, pool->p.init_arg);
> }
>
> -static void page_pool_clear_pp_info(struct page *page)
> +static void page_pool_clear_pp_info(struct netmem *nmem)
> {
> - page->pp_magic = 0;
> - page->pp = NULL;
> + nmem->pp_magic = 0;
> + nmem->pp = NULL;
> }
>
> static struct page *__page_pool_alloc_page_order(struct page_pool *pool,
> @@ -467,7 +467,7 @@ static s32 page_pool_inflight(struct page_pool *pool)
> * a regular page (that will eventually be returned to the normal
> * page-allocator via put_page).
> */
> -void page_pool_release_page(struct page_pool *pool, struct page *page)
> +void page_pool_release_netmem(struct page_pool *pool, struct netmem *nmem)
> {
> dma_addr_t dma;
> int count;
> @@ -478,23 +478,23 @@ void page_pool_release_page(struct page_pool *pool, struct page *page)
> */
> goto skip_dma_unmap;
>
> - dma = page_pool_get_dma_addr(page);
> + dma = netmem_get_dma_addr(nmem);
>
> /* When page is unmapped, it cannot be returned to our pool */
> dma_unmap_page_attrs(pool->p.dev, dma,
> PAGE_SIZE << pool->p.order, pool->p.dma_dir,
> DMA_ATTR_SKIP_CPU_SYNC);
> - page_pool_set_dma_addr(page, 0);
> + netmem_set_dma_addr(nmem, 0);
> skip_dma_unmap:
> - page_pool_clear_pp_info(page);
> + page_pool_clear_pp_info(nmem);
>
> /* This may be the last page returned, releasing the pool, so
> * it is not safe to reference pool afterwards.
> */
> count = atomic_inc_return_relaxed(&pool->pages_state_release_cnt);
> - trace_page_pool_state_release(pool, page, count);
> + trace_page_pool_state_release(pool, nmem, count);
> }
> -EXPORT_SYMBOL(page_pool_release_page);
> +EXPORT_SYMBOL(page_pool_release_netmem);
>
> /* Return a page to the page allocator, cleaning up our state */
> static void page_pool_return_page(struct page_pool *pool, struct page *page)
> --
> 2.35.1
>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>
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