From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="ZDvzT+jQ" Received: from mail-lf1-x131.google.com (mail-lf1-x131.google.com [IPv6:2a00:1450:4864:20::131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A411ACF for ; Tue, 12 Dec 2023 00:12:28 -0800 (PST) Received: by mail-lf1-x131.google.com with SMTP id 2adb3069b0e04-50be3611794so6335901e87.0 for ; Tue, 12 Dec 2023 00:12:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1702368747; x=1702973547; darn=vger.kernel.org; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=cLK67MZ2cMXqVULAwpdm/zZK5C57DrnMrrkfs3M5C2A=; b=ZDvzT+jQKYRl5fjH8/Y0Y/bXhW56+dGYsw+jbmNhgafCApf1iQWv0jnCo607aHTjhW p15FRq7frwgqnkSvUe+9uD8Y2B9Q3Sf+d8EMgtdqc6AuH1uqNwbtzNtiH1lAM6HVHorH ZBssx+/OeaVdHbt+MjpML7Wp1ZCqavgUHnOSC+c1uP3CIret40TWknIPa0fQqxRgJ7pC QGCY+gpPQukFXzkipUOqMf+yxOuryg/uJnYPTOGvlmB15hn/ySakbx9uY5HBqRyheRUY ZpMOGZbda7Z3+va/r6JeUC3BaLBlZaeR0dCDTThdI3VkNY64qhSeJNLykTSHZRwJbVB1 6PtA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1702368747; x=1702973547; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=cLK67MZ2cMXqVULAwpdm/zZK5C57DrnMrrkfs3M5C2A=; b=tjrkcXL/Ok7V4V+vysoNflUCckTXL+zKmc5bObjHECye84ujETkOODYTDRPQKYA0Hf SiMxOEW3lgc0gerZ5zNZKTwnQMH/e1HooXfNGrSzYGo4ScP84w2pzlASkXvUKz8bK5ik AER7+1LMj7CyPLkXHdpDYLpnXp4QBkoAUXVFOuvaEOOFe9+gEWA+v+rZSehuhkiNw0j5 k7a/0qqGlAWi0IxvhAaigO5gLPEfIz72CRpcjtfdrCHf6Ld2/fOGr4VrISHRBP8g89dg 6TFPuxmrqWaNyR2ZzihDzQGDZddmbof+5QH6uhX8VgfLjPfpR79qB/e1JzdGvGCsR5S+ CEZA== X-Gm-Message-State: AOJu0Yw0UQ3ey7z+rc2wiY04ndscC0jbgDsDid418b3qK94jDw6TfpDc ox7O4FEB0RNUjtv5RLSU7JuKiGXF3DF+GxTFAeqalw== X-Google-Smtp-Source: AGHT+IE/4NCAGrcWlk83IyW9mzgbqR3p3HmgUFXHYCCu/8mM+LfWDqVB4qdieN1J9FLWy4acb9y4oFfWbA7pp1ExuZI= X-Received: by 2002:a05:6512:2312:b0:50b:f6d2:8569 with SMTP id o18-20020a056512231200b0050bf6d28569mr2921097lfu.129.1702368746841; Tue, 12 Dec 2023 00:12:26 -0800 (PST) Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <20231208005250.2910004-1-almasrymina@google.com> <20231208005250.2910004-2-almasrymina@google.com> In-Reply-To: <20231208005250.2910004-2-almasrymina@google.com> From: Ilias Apalodimas Date: Tue, 12 Dec 2023 10:11:50 +0200 Message-ID: Subject: Re: [net-next v1 01/16] net: page_pool: factor out releasing DMA from releasing the page To: Mina Almasry Cc: Shailend Chand , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-arch@vger.kernel.org, linux-kselftest@vger.kernel.org, bpf@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Jonathan Corbet , Jeroen de Borst , Praveen Kaligineedi , Jesper Dangaard Brouer , Arnd Bergmann , David Ahern , Willem de Bruijn , Shuah Khan , Sumit Semwal , =?UTF-8?Q?Christian_K=C3=B6nig?= , Yunsheng Lin , Harshitha Ramamurthy , Shakeel Butt Content-Type: text/plain; charset="UTF-8" On Fri, 8 Dec 2023 at 02:52, Mina Almasry wrote: > > From: Jakub Kicinski > > Releasing the DMA mapping will be useful for other types > of pages, so factor it out. Make sure compiler inlines it, > to avoid any regressions. > > Signed-off-by: Jakub Kicinski > Signed-off-by: Mina Almasry > > --- > > This is implemented by Jakub in his RFC: > > https://lore.kernel.org/netdev/f8270765-a27b-6ccf-33ea-cda097168d79@redhat.com/T/ > > I take no credit for the idea or implementation. This is a critical > dependency of device memory TCP and thus I'm pulling it into this series > to make it revewable and mergable. > > --- > net/core/page_pool.c | 25 ++++++++++++++++--------- > 1 file changed, 16 insertions(+), 9 deletions(-) > > diff --git a/net/core/page_pool.c b/net/core/page_pool.c > index c2e7c9a6efbe..ca1b3b65c9b5 100644 > --- a/net/core/page_pool.c > +++ b/net/core/page_pool.c > @@ -548,21 +548,16 @@ s32 page_pool_inflight(const struct page_pool *pool, bool strict) > return inflight; > } > > -/* Disconnects a page (from a page_pool). API users can have a need > - * to disconnect a page (from a page_pool), to allow it to be used as > - * a regular page (that will eventually be returned to the normal > - * page-allocator via put_page). > - */ > -static void page_pool_return_page(struct page_pool *pool, struct page *page) > +static __always_inline > +void __page_pool_release_page_dma(struct page_pool *pool, struct page *page) > { > dma_addr_t dma; > - int count; > > if (!(pool->p.flags & PP_FLAG_DMA_MAP)) > /* Always account for inflight pages, even if we didn't > * map them > */ > - goto skip_dma_unmap; > + return; > > dma = page_pool_get_dma_addr(page); > > @@ -571,7 +566,19 @@ static void page_pool_return_page(struct page_pool *pool, struct page *page) > PAGE_SIZE << pool->p.order, pool->p.dma_dir, > DMA_ATTR_SKIP_CPU_SYNC | DMA_ATTR_WEAK_ORDERING); > page_pool_set_dma_addr(page, 0); > -skip_dma_unmap: > +} > + > +/* Disconnects a page (from a page_pool). API users can have a need > + * to disconnect a page (from a page_pool), to allow it to be used as > + * a regular page (that will eventually be returned to the normal > + * page-allocator via put_page). > + */ > +void page_pool_return_page(struct page_pool *pool, struct page *page) > +{ > + int count; > + > + __page_pool_release_page_dma(pool, page); > + > page_pool_clear_pp_info(page); > > /* This may be the last page returned, releasing the pool, so > -- > 2.43.0.472.g3155946c3a-goog > Reviewed-by: Ilias Apalodimas