From patchwork Tue Jun 25 19:53:53 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mina Almasry X-Patchwork-Id: 13711914 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 117C1C2BBCA for ; Tue, 25 Jun 2024 19:54:24 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 8F6AE6B00A6; Tue, 25 Jun 2024 15:54:23 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 8A6806B00A8; Tue, 25 Jun 2024 15:54:23 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6AB056B00AA; Tue, 25 Jun 2024 15:54:23 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 489AD6B00A6 for ; Tue, 25 Jun 2024 15:54:23 -0400 (EDT) Received: from smtpin10.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id EF821140569 for ; Tue, 25 Jun 2024 19:54:22 +0000 (UTC) X-FDA: 82270462764.10.F1C44D8 Received: from mail-yw1-f202.google.com (mail-yw1-f202.google.com [209.85.128.202]) by imf12.hostedemail.com (Postfix) with ESMTP id 1BE4440011 for ; Tue, 25 Jun 2024 19:54:20 +0000 (UTC) Authentication-Results: imf12.hostedemail.com; dkim=pass header.d=google.com header.s=20230601 header.b=qsnXO+ex; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf12.hostedemail.com: domain of 3ayB7ZgsKCNIy9AyGFMA6By4CC492.0CA96BIL-AA8Jy08.CF4@flex--almasrymina.bounces.google.com designates 209.85.128.202 as permitted sender) smtp.mailfrom=3ayB7ZgsKCNIy9AyGFMA6By4CC492.0CA96BIL-AA8Jy08.CF4@flex--almasrymina.bounces.google.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1719345244; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=3/CDe0i0ozx/YBNfMyCEFOeTu9/dsYuFtt8yw96UPeo=; b=3gezK7tlN3Hcik0c6Yd32Ed8TJRAV17oorgA8h3RKemDWVrKnpuJgzbdfThMF/lbSs0XBT KF+QU/8R2RaO/ES4HM5Qwax80sEcH7Ki+oBmq2By/yjHkbyJsSqMwggZZ+GO0TwK2KILFh bZlLFymR+GXJTvsg3jLucZ8Wov8c9+Y= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1719345244; a=rsa-sha256; cv=none; b=zydb4zDOQrktZ8j1c2poDFlHGgtYbvcZunNN9qjnRf2DM0suhNkzopHrCEoG05zDLoyr7n 3wwpCAompYcpe6o2OTb2kBIL07xNJ8zvQdZa1Z4lgA1RKt7S/w+Ec+AvWA+mj50J/3u746 7wimtMHG1BaGYXruZk/BUP7jZWWrwAQ= ARC-Authentication-Results: i=1; imf12.hostedemail.com; dkim=pass header.d=google.com header.s=20230601 header.b=qsnXO+ex; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf12.hostedemail.com: domain of 3ayB7ZgsKCNIy9AyGFMA6By4CC492.0CA96BIL-AA8Jy08.CF4@flex--almasrymina.bounces.google.com designates 209.85.128.202 as permitted sender) smtp.mailfrom=3ayB7ZgsKCNIy9AyGFMA6By4CC492.0CA96BIL-AA8Jy08.CF4@flex--almasrymina.bounces.google.com Received: by mail-yw1-f202.google.com with SMTP id 00721157ae682-62f43c95de4so135151117b3.3 for ; Tue, 25 Jun 2024 12:54:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1719345260; x=1719950060; darn=kvack.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=3/CDe0i0ozx/YBNfMyCEFOeTu9/dsYuFtt8yw96UPeo=; b=qsnXO+ex4XmJx+zdHSwnMLf0h9A+pWjG6FtnGC+YE7YXMXAEykDP2tdQwx0Bk7gDnm nEvmvrBnCxELl0ijzT1IANTUwy2Rp/ZSRbSZw0MqiaB3hqfgiGLGnJpfBOhip7JK1Jd1 BNNwTSk6jMH/cywGSnAT15rcENOmofPxTlIVWVRWteZ5x8oqZz+yiVnAoZQp1/YgXh1p wzwHA7ERkX0we6XsdVF1LvDYV+gUj0u4CWrm+o22JdPuke3STKEydj5Qw+b/JFJxejte TSXDM6Q6CkaCZojc7PtA8RgAjUou865KlNBORAID0Cr7Wf/BnprHV3vUAPVH2du5zBbu Q3Xw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1719345260; x=1719950060; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=3/CDe0i0ozx/YBNfMyCEFOeTu9/dsYuFtt8yw96UPeo=; b=XWzXI8y0ULeqNwKazoqrFCl3SgAtIlV1h6yLB1ybDlf7+u57fxJpnKEK6PDZXWhq75 tjSzVUKHUIqWWbbBiZB5DPVgOmoauVuNg4LDkDpsIlAcxLRT4kqwIrXcJJc38gheIVcY kiNswAAxG7uNfF4Jdhbe+RR+nIujJlrj2r9xdwr6nSjZdCfHi7OEjZmfgDJdV+g47h8w HDvAbQX3BDDpW8m6WYe2mWmoPK9uYwcWvLL9qi/qmRM7v3mst4b7wXLWStaFZBkLy2VE QTQ/Yupos62DoPpQgtLBWcIwb1qh5KleZyfSgmI7a2RirjCvuH/6zm3/xNHIOiOABmZ4 sFYw== X-Forwarded-Encrypted: i=1; AJvYcCXRAmMlmcSLUvAQnIUnud2LDHA/8/WrBjD9/zc7cH6NsO1rv2PMjSwLCTDLNvrIK9APSD4MB5y6eu7zFJXgiRW62wc= X-Gm-Message-State: AOJu0YwSXXpC8gvUDWVRu6LLbMdxai5EMVppDiWGHC0oQwtqIfYKdgCJ CvKPqxzSSWQ9XamNZRcdyKTPxugxPcMlrIls4SAn5lPpilgwNA6hfOrXv54cWdLPJ6GpTBBHaXi D4778NIYTlHhWr9elvUflSQ== X-Google-Smtp-Source: AGHT+IEsOk3Pwd1AyzyvlyNzmPSfImAD8W9QkndOn+/vybAya0UvVuhGV3J8C1kkfr+26vUHsmNsE/HAVbKBZLNl4g== X-Received: from almasrymina.c.googlers.com ([fda3:e722:ac3:cc00:20:ed76:c0a8:4bc5]) (user=almasrymina job=sendgmr) by 2002:a05:6902:c0c:b0:e03:320e:5b78 with SMTP id 3f1490d57ef6-e03320e5d45mr621276.2.1719345259907; Tue, 25 Jun 2024 12:54:19 -0700 (PDT) Date: Tue, 25 Jun 2024 19:53:53 +0000 In-Reply-To: <20240625195407.1922912-1-almasrymina@google.com> Mime-Version: 1.0 References: <20240625195407.1922912-1-almasrymina@google.com> X-Mailer: git-send-email 2.45.2.741.gdbec12cfda-goog Message-ID: <20240625195407.1922912-6-almasrymina@google.com> Subject: [PATCH net-next v14 05/13] page_pool: convert to use netmem From: Mina Almasry To: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-alpha@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, sparclinux@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-arch@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org Cc: Mina Almasry , Donald Hunter , Jakub Kicinski , "David S. Miller" , Eric Dumazet , Paolo Abeni , Jonathan Corbet , Richard Henderson , Ivan Kokshaysky , Matt Turner , Thomas Bogendoerfer , "James E.J. Bottomley" , Helge Deller , Andreas Larsson , Jesper Dangaard Brouer , Ilias Apalodimas , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Arnd Bergmann , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Steffen Klassert , Herbert Xu , David Ahern , Willem de Bruijn , Shuah Khan , Sumit Semwal , " =?utf-8?q?Christian_K=C3=B6nig?= " , Bagas Sanjaya , Christoph Hellwig , Nikolay Aleksandrov , Pavel Begunkov , David Wei , Jason Gunthorpe , Yunsheng Lin , Shailend Chand , Harshitha Ramamurthy , Shakeel Butt , Jeroen de Borst , Praveen Kaligineedi , linux-mm@kvack.org, Matthew Wilcox X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 1BE4440011 X-Stat-Signature: ki81fqazr1q4widht9ia4xbg79bb5xij X-Rspam-User: X-HE-Tag: 1719345260-800333 X-HE-Meta: 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 pfgJPzzi 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Abstract the memory type from the page_pool so we can later add support for new memory types. Convert the page_pool to use the new netmem type abstraction, rather than use struct page directly. As of this patch the netmem type is a no-op abstraction: it's always a struct page underneath. All the page pool internals are converted to use struct netmem instead of struct page, and the page pool now exports 2 APIs: 1. The existing struct page API. 2. The new struct netmem API. Keeping the existing API is transitional; we do not want to refactor all the current drivers using the page pool at once. The netmem abstraction is currently a no-op. The page_pool uses page_to_netmem() to convert allocated pages to netmem, and uses netmem_to_page() to convert the netmem back to pages to pass to mm APIs, Follow up patches to this series add non-paged netmem support to the page_pool. This change is factored out on its own to limit the code churn to this 1 patch, for ease of code review. Signed-off-by: Mina Almasry Reviewed-by: Pavel Begunkov --- v13: - Fix allmodconfig build error. NET_IOV was not defined as of this patch. - Removed unnecessary update of page_pool_alloc() API. It now retains it struct page* interface. (Paul). - Fixed comments Pavel pointed to. - Applied reviewed-by from Pavel. v12: - Fix allmodconfig build error. Very recently renesas/ravb_main.c added a dependency on page_pool that I missed in my rebase. The dependency calls page_pool_alloc() directly as it wants to set a custom gfp_mask, which is unique as all other drivers call a wrapper to that function. Fix it by adding netmem_to_page() in the driver. - Fix printing netmem trace printing (Pavel). v11: - Fix typing to remove sparse warning. (Paolo/Steven) v9: - Fix sparse error (Simon). v8: - Fix napi_pp_put_page() taking netmem instead of page to fix patch-by-patch build error. - Add net/netmem.h include in this patch to fix patch-by-patch build error. v6: - Rebased on top of the merged netmem_ref type. Cc: linux-mm@kvack.org Cc: Matthew Wilcox --- include/linux/skbuff_ref.h | 4 +- include/net/netmem.h | 15 ++ include/net/page_pool/helpers.h | 91 ++++++--- include/net/page_pool/types.h | 14 +- include/trace/events/page_pool.h | 30 +-- net/bpf/test_run.c | 5 +- net/core/page_pool.c | 304 +++++++++++++++++-------------- net/core/skbuff.c | 8 +- 8 files changed, 287 insertions(+), 184 deletions(-) diff --git a/include/linux/skbuff_ref.h b/include/linux/skbuff_ref.h index 11f0a40634033..16c241a234728 100644 --- a/include/linux/skbuff_ref.h +++ b/include/linux/skbuff_ref.h @@ -32,13 +32,13 @@ static inline void skb_frag_ref(struct sk_buff *skb, int f) __skb_frag_ref(&skb_shinfo(skb)->frags[f]); } -bool napi_pp_put_page(struct page *page); +bool napi_pp_put_page(netmem_ref netmem); static inline void skb_page_unref(struct page *page, bool recycle) { #ifdef CONFIG_PAGE_POOL - if (recycle && napi_pp_put_page(page)) + if (recycle && napi_pp_put_page(page_to_netmem(page))) return; #endif put_page(page); diff --git a/include/net/netmem.h b/include/net/netmem.h index 01dbdd216fae7..664df8325ece5 100644 --- a/include/net/netmem.h +++ b/include/net/netmem.h @@ -66,4 +66,19 @@ static inline netmem_ref page_to_netmem(struct page *page) return (__force netmem_ref)page; } +static inline int netmem_ref_count(netmem_ref netmem) +{ + return page_ref_count(netmem_to_page(netmem)); +} + +static inline unsigned long netmem_to_pfn(netmem_ref netmem) +{ + return page_to_pfn(netmem_to_page(netmem)); +} + +static inline netmem_ref netmem_compound_head(netmem_ref netmem) +{ + return page_to_netmem(compound_head(netmem_to_page(netmem))); +} + #endif /* _NET_NETMEM_H */ diff --git a/include/net/page_pool/helpers.h b/include/net/page_pool/helpers.h index 873631c79ab16..2b43a893c619d 100644 --- a/include/net/page_pool/helpers.h +++ b/include/net/page_pool/helpers.h @@ -55,6 +55,8 @@ #include #include +#include +#include #ifdef CONFIG_PAGE_POOL_STATS /* Deprecated driver-facing API, use netlink instead */ @@ -212,6 +214,11 @@ page_pool_get_dma_dir(const struct page_pool *pool) return pool->p.dma_dir; } +static inline void page_pool_fragment_netmem(netmem_ref netmem, long nr) +{ + atomic_long_set(&netmem_to_page(netmem)->pp_ref_count, nr); +} + /** * page_pool_fragment_page() - split a fresh page into fragments * @page: page to split @@ -232,11 +239,12 @@ page_pool_get_dma_dir(const struct page_pool *pool) */ static inline void page_pool_fragment_page(struct page *page, long nr) { - atomic_long_set(&page->pp_ref_count, nr); + page_pool_fragment_netmem(page_to_netmem(page), nr); } -static inline long page_pool_unref_page(struct page *page, long nr) +static inline long page_pool_unref_netmem(netmem_ref netmem, long nr) { + struct page *page = netmem_to_page(netmem); long ret; /* If nr == pp_ref_count then we have cleared all remaining @@ -279,15 +287,41 @@ static inline long page_pool_unref_page(struct page *page, long nr) return ret; } +static inline long page_pool_unref_page(struct page *page, long nr) +{ + return page_pool_unref_netmem(page_to_netmem(page), nr); +} + +static inline void page_pool_ref_netmem(netmem_ref netmem) +{ + atomic_long_inc(&netmem_to_page(netmem)->pp_ref_count); +} + static inline void page_pool_ref_page(struct page *page) { - atomic_long_inc(&page->pp_ref_count); + page_pool_ref_netmem(page_to_netmem(page)); } -static inline bool page_pool_is_last_ref(struct page *page) +static inline bool page_pool_is_last_ref(netmem_ref netmem) { /* If page_pool_unref_page() returns 0, we were the last user */ - return page_pool_unref_page(page, 1) == 0; + return page_pool_unref_netmem(netmem, 1) == 0; +} + +static inline void page_pool_put_netmem(struct page_pool *pool, + netmem_ref netmem, + unsigned int dma_sync_size, + bool allow_direct) +{ + /* When page_pool isn't compiled-in, net/core/xdp.c doesn't + * allow registering MEM_TYPE_PAGE_POOL, but shield linker. + */ +#ifdef CONFIG_PAGE_POOL + if (!page_pool_is_last_ref(netmem)) + return; + + page_pool_put_unrefed_netmem(pool, netmem, dma_sync_size, allow_direct); +#endif } /** @@ -308,15 +342,15 @@ static inline void page_pool_put_page(struct page_pool *pool, unsigned int dma_sync_size, bool allow_direct) { - /* When page_pool isn't compiled-in, net/core/xdp.c doesn't - * allow registering MEM_TYPE_PAGE_POOL, but shield linker. - */ -#ifdef CONFIG_PAGE_POOL - if (!page_pool_is_last_ref(page)) - return; + page_pool_put_netmem(pool, page_to_netmem(page), dma_sync_size, + allow_direct); +} - page_pool_put_unrefed_page(pool, page, dma_sync_size, allow_direct); -#endif +static inline void page_pool_put_full_netmem(struct page_pool *pool, + netmem_ref netmem, + bool allow_direct) +{ + page_pool_put_netmem(pool, netmem, -1, allow_direct); } /** @@ -331,7 +365,7 @@ static inline void page_pool_put_page(struct page_pool *pool, static inline void page_pool_put_full_page(struct page_pool *pool, struct page *page, bool allow_direct) { - page_pool_put_page(pool, page, -1, allow_direct); + page_pool_put_netmem(pool, page_to_netmem(page), -1, allow_direct); } /** @@ -365,6 +399,18 @@ static inline void page_pool_free_va(struct page_pool *pool, void *va, page_pool_put_page(pool, virt_to_head_page(va), -1, allow_direct); } +static inline dma_addr_t page_pool_get_dma_addr_netmem(netmem_ref netmem) +{ + struct page *page = netmem_to_page(netmem); + + dma_addr_t ret = page->dma_addr; + + if (PAGE_POOL_32BIT_ARCH_WITH_64BIT_DMA) + ret <<= PAGE_SHIFT; + + return ret; +} + /** * page_pool_get_dma_addr() - Retrieve the stored DMA address. * @page: page allocated from a page pool @@ -374,16 +420,14 @@ static inline void page_pool_free_va(struct page_pool *pool, void *va, */ static inline dma_addr_t page_pool_get_dma_addr(const struct page *page) { - dma_addr_t ret = page->dma_addr; - - if (PAGE_POOL_32BIT_ARCH_WITH_64BIT_DMA) - ret <<= PAGE_SHIFT; - - return ret; + return page_pool_get_dma_addr_netmem(page_to_netmem((struct page *)page)); } -static inline bool page_pool_set_dma_addr(struct page *page, dma_addr_t addr) +static inline bool page_pool_set_dma_addr_netmem(netmem_ref netmem, + dma_addr_t addr) { + struct page *page = netmem_to_page(netmem); + if (PAGE_POOL_32BIT_ARCH_WITH_64BIT_DMA) { page->dma_addr = addr >> PAGE_SHIFT; @@ -419,6 +463,11 @@ static inline void page_pool_dma_sync_for_cpu(const struct page_pool *pool, page_pool_get_dma_dir(pool)); } +static inline bool page_pool_set_dma_addr(struct page *page, dma_addr_t addr) +{ + return page_pool_set_dma_addr_netmem(page_to_netmem(page), addr); +} + static inline bool page_pool_put(struct page_pool *pool) { return refcount_dec_and_test(&pool->user_cnt); diff --git a/include/net/page_pool/types.h b/include/net/page_pool/types.h index 9f3c3ee2ee755..0693117f8d74f 100644 --- a/include/net/page_pool/types.h +++ b/include/net/page_pool/types.h @@ -6,6 +6,7 @@ #include #include #include +#include #define PP_FLAG_DMA_MAP BIT(0) /* Should page_pool do the DMA * map/unmap @@ -40,7 +41,7 @@ #define PP_ALLOC_CACHE_REFILL 64 struct pp_alloc_cache { u32 count; - struct page *cache[PP_ALLOC_CACHE_SIZE]; + netmem_ref cache[PP_ALLOC_CACHE_SIZE]; }; /** @@ -73,7 +74,7 @@ struct page_pool_params { struct net_device *netdev; unsigned int flags; /* private: used by test code only */ - void (*init_callback)(struct page *page, void *arg); + void (*init_callback)(netmem_ref netmem, void *arg); void *init_arg; ); }; @@ -155,7 +156,7 @@ struct page_pool { */ __cacheline_group_begin(frag) __aligned(4 * sizeof(long)); long frag_users; - struct page *frag_page; + netmem_ref frag_page; unsigned int frag_offset; __cacheline_group_end(frag); @@ -226,8 +227,12 @@ struct page_pool { }; struct page *page_pool_alloc_pages(struct page_pool *pool, gfp_t gfp); +netmem_ref page_pool_alloc_netmem(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); +netmem_ref page_pool_alloc_frag_netmem(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); @@ -257,6 +262,9 @@ static inline void page_pool_put_page_bulk(struct page_pool *pool, void **data, } #endif +void page_pool_put_unrefed_netmem(struct page_pool *pool, netmem_ref netmem, + unsigned int dma_sync_size, + bool allow_direct); void page_pool_put_unrefed_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 6834356b2d2ae..543e54e432a18 100644 --- a/include/trace/events/page_pool.h +++ b/include/trace/events/page_pool.h @@ -42,51 +42,53 @@ TRACE_EVENT(page_pool_release, TRACE_EVENT(page_pool_state_release, TP_PROTO(const struct page_pool *pool, - const struct page *page, u32 release), + netmem_ref netmem, u32 release), - TP_ARGS(pool, page, release), + TP_ARGS(pool, netmem, release), TP_STRUCT__entry( __field(const struct page_pool *, pool) - __field(const struct page *, page) + __field(unsigned long, netmem) __field(u32, release) __field(unsigned long, pfn) ), TP_fast_assign( __entry->pool = pool; - __entry->page = page; + __entry->netmem = (__force unsigned long)netmem; __entry->release = release; - __entry->pfn = page_to_pfn(page); + __entry->pfn = netmem_to_pfn(netmem); ), - 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 netmem=%p pfn=0x%lx release=%u", + __entry->pool, (void *)__entry->netmem, + __entry->pfn, __entry->release) ); TRACE_EVENT(page_pool_state_hold, TP_PROTO(const struct page_pool *pool, - const struct page *page, u32 hold), + netmem_ref netmem, u32 hold), - TP_ARGS(pool, page, hold), + TP_ARGS(pool, netmem, hold), TP_STRUCT__entry( __field(const struct page_pool *, pool) - __field(const struct page *, page) + __field(unsigned long, netmem) __field(u32, hold) __field(unsigned long, pfn) ), TP_fast_assign( __entry->pool = pool; - __entry->page = page; + __entry->netmem = (__force unsigned long)netmem; __entry->hold = hold; - __entry->pfn = page_to_pfn(page); + __entry->pfn = netmem_to_pfn(netmem); ), - TP_printk("page_pool=%p page=%p pfn=0x%lx hold=%u", - __entry->pool, __entry->page, __entry->pfn, __entry->hold) + TP_printk("page_pool=%p netmem=%p pfn=0x%lx hold=%u", + __entry->pool, (void *)__entry->netmem, + __entry->pfn, __entry->hold) ); TRACE_EVENT(page_pool_update_nid, diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c index a6d7f790cdda8..26417ab34ff49 100644 --- a/net/bpf/test_run.c +++ b/net/bpf/test_run.c @@ -127,9 +127,10 @@ struct xdp_test_data { #define TEST_XDP_FRAME_SIZE (PAGE_SIZE - sizeof(struct xdp_page_head)) #define TEST_XDP_MAX_BATCH 256 -static void xdp_test_run_init_page(struct page *page, void *arg) +static void xdp_test_run_init_page(netmem_ref netmem, void *arg) { - struct xdp_page_head *head = phys_to_virt(page_to_phys(page)); + struct xdp_page_head *head = + phys_to_virt(page_to_phys(netmem_to_page(netmem))); struct xdp_buff *new_ctx, *orig_ctx; u32 headroom = XDP_PACKET_HEADROOM; struct xdp_test_data *xdp = arg; diff --git a/net/core/page_pool.c b/net/core/page_pool.c index 3927a0a7fa9a8..a5957d3359762 100644 --- a/net/core/page_pool.c +++ b/net/core/page_pool.c @@ -327,19 +327,18 @@ struct page_pool *page_pool_create(const struct page_pool_params *params) } EXPORT_SYMBOL(page_pool_create); -static void page_pool_return_page(struct page_pool *pool, struct page *page); +static void page_pool_return_page(struct page_pool *pool, netmem_ref netmem); -noinline -static struct page *page_pool_refill_alloc_cache(struct page_pool *pool) +static noinline netmem_ref page_pool_refill_alloc_cache(struct page_pool *pool) { struct ptr_ring *r = &pool->ring; - struct page *page; + netmem_ref netmem; int pref_nid; /* preferred NUMA node */ /* Quicker fallback, avoid locks when ring is empty */ if (__ptr_ring_empty(r)) { alloc_stat_inc(pool, empty); - return NULL; + return 0; } /* Softirq guarantee CPU and thus NUMA node is stable. This, @@ -354,57 +353,57 @@ static struct page *page_pool_refill_alloc_cache(struct page_pool *pool) /* Refill alloc array, but only if NUMA match */ do { - page = __ptr_ring_consume(r); - if (unlikely(!page)) + netmem = (__force netmem_ref)__ptr_ring_consume(r); + if (unlikely(!netmem)) break; - if (likely(page_to_nid(page) == pref_nid)) { - pool->alloc.cache[pool->alloc.count++] = page; + if (likely(page_to_nid(netmem_to_page(netmem)) == pref_nid)) { + pool->alloc.cache[pool->alloc.count++] = netmem; } else { /* NUMA mismatch; * (1) release 1 page to page-allocator and * (2) break out to fallthrough to alloc_pages_node. * This limit stress on page buddy alloactor. */ - page_pool_return_page(pool, page); + page_pool_return_page(pool, netmem); alloc_stat_inc(pool, waive); - page = NULL; + netmem = 0; break; } } while (pool->alloc.count < PP_ALLOC_CACHE_REFILL); /* Return last page */ if (likely(pool->alloc.count > 0)) { - page = pool->alloc.cache[--pool->alloc.count]; + netmem = pool->alloc.cache[--pool->alloc.count]; alloc_stat_inc(pool, refill); } - return page; + return netmem; } /* fast path */ -static struct page *__page_pool_get_cached(struct page_pool *pool) +static netmem_ref __page_pool_get_cached(struct page_pool *pool) { - struct page *page; + netmem_ref netmem; /* Caller MUST guarantee safe non-concurrent access, e.g. softirq */ if (likely(pool->alloc.count)) { /* Fast-path */ - page = pool->alloc.cache[--pool->alloc.count]; + netmem = pool->alloc.cache[--pool->alloc.count]; alloc_stat_inc(pool, fast); } else { - page = page_pool_refill_alloc_cache(pool); + netmem = page_pool_refill_alloc_cache(pool); } - return page; + return netmem; } static void __page_pool_dma_sync_for_device(const struct page_pool *pool, - const struct page *page, + netmem_ref netmem, u32 dma_sync_size) { #if defined(CONFIG_HAS_DMA) && defined(CONFIG_DMA_NEED_SYNC) - dma_addr_t dma_addr = page_pool_get_dma_addr(page); + dma_addr_t dma_addr = page_pool_get_dma_addr_netmem(netmem); dma_sync_size = min(dma_sync_size, pool->p.max_len); __dma_sync_single_for_device(pool->p.dev, dma_addr + pool->p.offset, @@ -414,14 +413,14 @@ static void __page_pool_dma_sync_for_device(const struct page_pool *pool, static __always_inline void page_pool_dma_sync_for_device(const struct page_pool *pool, - const struct page *page, + netmem_ref netmem, u32 dma_sync_size) { if (pool->dma_sync && dma_dev_need_sync(pool->p.dev)) - __page_pool_dma_sync_for_device(pool, page, dma_sync_size); + __page_pool_dma_sync_for_device(pool, netmem, dma_sync_size); } -static bool page_pool_dma_map(struct page_pool *pool, struct page *page) +static bool page_pool_dma_map(struct page_pool *pool, netmem_ref netmem) { dma_addr_t dma; @@ -430,17 +429,17 @@ static bool page_pool_dma_map(struct page_pool *pool, struct page *page) * into page private data (i.e 32bit cpu with 64bit DMA caps) * This mapping is kept for lifetime of page, until leaving pool. */ - dma = dma_map_page_attrs(pool->p.dev, page, 0, - (PAGE_SIZE << pool->p.order), - pool->p.dma_dir, DMA_ATTR_SKIP_CPU_SYNC | - DMA_ATTR_WEAK_ORDERING); + dma = dma_map_page_attrs(pool->p.dev, netmem_to_page(netmem), 0, + (PAGE_SIZE << pool->p.order), pool->p.dma_dir, + DMA_ATTR_SKIP_CPU_SYNC | + DMA_ATTR_WEAK_ORDERING); if (dma_mapping_error(pool->p.dev, dma)) return false; - if (page_pool_set_dma_addr(page, dma)) + if (page_pool_set_dma_addr_netmem(netmem, dma)) goto unmap_failed; - page_pool_dma_sync_for_device(pool, page, pool->p.max_len); + page_pool_dma_sync_for_device(pool, netmem, pool->p.max_len); return true; @@ -452,9 +451,10 @@ static bool page_pool_dma_map(struct page_pool *pool, struct page *page) return false; } -static void page_pool_set_pp_info(struct page_pool *pool, - struct page *page) +static void page_pool_set_pp_info(struct page_pool *pool, netmem_ref netmem) { + struct page *page = netmem_to_page(netmem); + page->pp = pool; page->pp_magic |= PP_SIGNATURE; @@ -464,13 +464,15 @@ static void page_pool_set_pp_info(struct page_pool *pool, * is dirtying the same cache line as the page->pp_magic above, so * the overhead is negligible. */ - page_pool_fragment_page(page, 1); + page_pool_fragment_netmem(netmem, 1); if (pool->has_init_callback) - pool->slow.init_callback(page, pool->slow.init_arg); + pool->slow.init_callback(netmem, pool->slow.init_arg); } -static void page_pool_clear_pp_info(struct page *page) +static void page_pool_clear_pp_info(netmem_ref netmem) { + struct page *page = netmem_to_page(netmem); + page->pp_magic = 0; page->pp = NULL; } @@ -485,34 +487,34 @@ static struct page *__page_pool_alloc_page_order(struct page_pool *pool, if (unlikely(!page)) return NULL; - if (pool->dma_map && unlikely(!page_pool_dma_map(pool, page))) { + if (pool->dma_map && unlikely(!page_pool_dma_map(pool, page_to_netmem(page)))) { put_page(page); return NULL; } alloc_stat_inc(pool, slow_high_order); - page_pool_set_pp_info(pool, page); + page_pool_set_pp_info(pool, page_to_netmem(page)); /* Track how many pages are held 'in-flight' */ pool->pages_state_hold_cnt++; - trace_page_pool_state_hold(pool, page, pool->pages_state_hold_cnt); + trace_page_pool_state_hold(pool, page_to_netmem(page), + pool->pages_state_hold_cnt); return page; } /* slow path */ -noinline -static struct page *__page_pool_alloc_pages_slow(struct page_pool *pool, - gfp_t gfp) +static noinline netmem_ref __page_pool_alloc_pages_slow(struct page_pool *pool, + gfp_t gfp) { const int bulk = PP_ALLOC_CACHE_REFILL; unsigned int pp_order = pool->p.order; bool dma_map = pool->dma_map; - struct page *page; + netmem_ref netmem; int i, nr_pages; /* Don't support bulk alloc for high-order pages */ if (unlikely(pp_order)) - return __page_pool_alloc_page_order(pool, gfp); + return page_to_netmem(__page_pool_alloc_page_order(pool, gfp)); /* Unnecessary as alloc cache is empty, but guarantees zero count */ if (unlikely(pool->alloc.count > 0)) @@ -521,56 +523,63 @@ static struct page *__page_pool_alloc_pages_slow(struct page_pool *pool, /* Mark empty alloc.cache slots "empty" for alloc_pages_bulk_array */ memset(&pool->alloc.cache, 0, sizeof(void *) * bulk); - nr_pages = alloc_pages_bulk_array_node(gfp, pool->p.nid, bulk, - pool->alloc.cache); + nr_pages = alloc_pages_bulk_array_node(gfp, + pool->p.nid, bulk, + (struct page **)pool->alloc.cache); if (unlikely(!nr_pages)) - return NULL; + return 0; /* Pages have been filled into alloc.cache array, but count is zero and * page element have not been (possibly) DMA mapped. */ for (i = 0; i < nr_pages; i++) { - page = pool->alloc.cache[i]; - if (dma_map && unlikely(!page_pool_dma_map(pool, page))) { - put_page(page); + netmem = pool->alloc.cache[i]; + if (dma_map && unlikely(!page_pool_dma_map(pool, netmem))) { + put_page(netmem_to_page(netmem)); continue; } - page_pool_set_pp_info(pool, page); - pool->alloc.cache[pool->alloc.count++] = page; + page_pool_set_pp_info(pool, netmem); + pool->alloc.cache[pool->alloc.count++] = netmem; /* Track how many pages are held 'in-flight' */ pool->pages_state_hold_cnt++; - trace_page_pool_state_hold(pool, page, + trace_page_pool_state_hold(pool, netmem, pool->pages_state_hold_cnt); } /* Return last page */ if (likely(pool->alloc.count > 0)) { - page = pool->alloc.cache[--pool->alloc.count]; + netmem = pool->alloc.cache[--pool->alloc.count]; alloc_stat_inc(pool, slow); } else { - page = NULL; + netmem = 0; } /* When page just alloc'ed is should/must have refcnt 1. */ - return page; + return netmem; } /* For using page_pool replace: alloc_pages() API calls, but provide * synchronization guarantee for allocation side. */ -struct page *page_pool_alloc_pages(struct page_pool *pool, gfp_t gfp) +netmem_ref page_pool_alloc_netmem(struct page_pool *pool, gfp_t gfp) { - struct page *page; + netmem_ref netmem; /* Fast-path: Get a page from cache */ - page = __page_pool_get_cached(pool); - if (page) - return page; + netmem = __page_pool_get_cached(pool); + if (netmem) + return netmem; /* Slow-path: cache empty, do real allocation */ - page = __page_pool_alloc_pages_slow(pool, gfp); - return page; + netmem = __page_pool_alloc_pages_slow(pool, gfp); + return netmem; +} +EXPORT_SYMBOL(page_pool_alloc_netmem); + +struct page *page_pool_alloc_pages(struct page_pool *pool, gfp_t gfp) +{ + return netmem_to_page(page_pool_alloc_netmem(pool, gfp)); } EXPORT_SYMBOL(page_pool_alloc_pages); ALLOW_ERROR_INJECTION(page_pool_alloc_pages, NULL); @@ -599,8 +608,8 @@ s32 page_pool_inflight(const struct page_pool *pool, bool strict) return inflight; } -static __always_inline -void __page_pool_release_page_dma(struct page_pool *pool, struct page *page) +static __always_inline void __page_pool_release_page_dma(struct page_pool *pool, + netmem_ref netmem) { dma_addr_t dma; @@ -610,13 +619,13 @@ void __page_pool_release_page_dma(struct page_pool *pool, struct page *page) */ return; - dma = page_pool_get_dma_addr(page); + dma = page_pool_get_dma_addr_netmem(netmem); /* 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 | DMA_ATTR_WEAK_ORDERING); - page_pool_set_dma_addr(page, 0); + page_pool_set_dma_addr_netmem(netmem, 0); } /* Disconnects a page (from a page_pool). API users can have a need @@ -624,35 +633,34 @@ void __page_pool_release_page_dma(struct page_pool *pool, struct page *page) * 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) +void page_pool_return_page(struct page_pool *pool, netmem_ref netmem) { int count; - __page_pool_release_page_dma(pool, page); - - page_pool_clear_pp_info(page); + __page_pool_release_page_dma(pool, netmem); /* 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, netmem, count); - put_page(page); + page_pool_clear_pp_info(netmem); + put_page(netmem_to_page(netmem)); /* An optimization would be to call __free_pages(page, pool->p.order) * knowing page is not part of page-cache (thus avoiding a * __page_cache_release() call). */ } -static bool page_pool_recycle_in_ring(struct page_pool *pool, struct page *page) +static bool page_pool_recycle_in_ring(struct page_pool *pool, netmem_ref netmem) { int ret; /* BH protection not needed if current is softirq */ if (in_softirq()) - ret = ptr_ring_produce(&pool->ring, page); + ret = ptr_ring_produce(&pool->ring, (__force void *)netmem); else - ret = ptr_ring_produce_bh(&pool->ring, page); + ret = ptr_ring_produce_bh(&pool->ring, (__force void *)netmem); if (!ret) { recycle_stat_inc(pool, ring); @@ -667,7 +675,7 @@ static bool page_pool_recycle_in_ring(struct page_pool *pool, struct page *page) * * Caller must provide appropriate safe context. */ -static bool page_pool_recycle_in_cache(struct page *page, +static bool page_pool_recycle_in_cache(netmem_ref netmem, struct page_pool *pool) { if (unlikely(pool->alloc.count == PP_ALLOC_CACHE_SIZE)) { @@ -676,14 +684,15 @@ static bool page_pool_recycle_in_cache(struct page *page, } /* Caller MUST have verified/know (page_ref_count(page) == 1) */ - pool->alloc.cache[pool->alloc.count++] = page; + pool->alloc.cache[pool->alloc.count++] = netmem; recycle_stat_inc(pool, cached); return true; } -static bool __page_pool_page_can_be_recycled(const struct page *page) +static bool __page_pool_page_can_be_recycled(netmem_ref netmem) { - return page_ref_count(page) == 1 && !page_is_pfmemalloc(page); + return page_ref_count(netmem_to_page(netmem)) == 1 && + !page_is_pfmemalloc(netmem_to_page(netmem)); } /* If the page refcnt == 1, this will try to recycle the page. @@ -692,8 +701,8 @@ static bool __page_pool_page_can_be_recycled(const struct page *page) * If the page refcnt != 1, then the page will be returned to memory * subsystem. */ -static __always_inline struct page * -__page_pool_put_page(struct page_pool *pool, struct page *page, +static __always_inline netmem_ref +__page_pool_put_page(struct page_pool *pool, netmem_ref netmem, unsigned int dma_sync_size, bool allow_direct) { lockdep_assert_no_hardirq(); @@ -707,16 +716,16 @@ __page_pool_put_page(struct page_pool *pool, struct page *page, * page is NOT reusable when allocated when system is under * some pressure. (page_is_pfmemalloc) */ - if (likely(__page_pool_page_can_be_recycled(page))) { + if (likely(__page_pool_page_can_be_recycled(netmem))) { /* Read barrier done in page_ref_count / READ_ONCE */ - page_pool_dma_sync_for_device(pool, page, dma_sync_size); + page_pool_dma_sync_for_device(pool, netmem, dma_sync_size); - if (allow_direct && page_pool_recycle_in_cache(page, pool)) - return NULL; + if (allow_direct && page_pool_recycle_in_cache(netmem, pool)) + return 0; /* Page found as candidate for recycling */ - return page; + return netmem; } /* Fallback/non-XDP mode: API user have elevated refcnt. * @@ -732,9 +741,9 @@ __page_pool_put_page(struct page_pool *pool, struct page *page, * will be invoking put_page. */ recycle_stat_inc(pool, released_refcnt); - page_pool_return_page(pool, page); + page_pool_return_page(pool, netmem); - return NULL; + return 0; } static bool page_pool_napi_local(const struct page_pool *pool) @@ -760,19 +769,28 @@ static bool page_pool_napi_local(const struct page_pool *pool) return napi && READ_ONCE(napi->list_owner) == cpuid; } -void page_pool_put_unrefed_page(struct page_pool *pool, struct page *page, - unsigned int dma_sync_size, bool allow_direct) +void page_pool_put_unrefed_netmem(struct page_pool *pool, netmem_ref netmem, + unsigned int dma_sync_size, bool allow_direct) { if (!allow_direct) allow_direct = page_pool_napi_local(pool); - page = __page_pool_put_page(pool, page, dma_sync_size, allow_direct); - if (page && !page_pool_recycle_in_ring(pool, page)) { + netmem = + __page_pool_put_page(pool, netmem, dma_sync_size, allow_direct); + if (netmem && !page_pool_recycle_in_ring(pool, netmem)) { /* Cache full, fallback to free pages */ recycle_stat_inc(pool, ring_full); - page_pool_return_page(pool, page); + page_pool_return_page(pool, netmem); } } +EXPORT_SYMBOL(page_pool_put_unrefed_netmem); + +void page_pool_put_unrefed_page(struct page_pool *pool, struct page *page, + unsigned int dma_sync_size, bool allow_direct) +{ + page_pool_put_unrefed_netmem(pool, page_to_netmem(page), dma_sync_size, + allow_direct); +} EXPORT_SYMBOL(page_pool_put_unrefed_page); /** @@ -800,16 +818,16 @@ void page_pool_put_page_bulk(struct page_pool *pool, void **data, allow_direct = page_pool_napi_local(pool); for (i = 0; i < count; i++) { - struct page *page = virt_to_head_page(data[i]); + netmem_ref netmem = page_to_netmem(virt_to_head_page(data[i])); /* It is not the last user for the page frag case */ - if (!page_pool_is_last_ref(page)) + if (!page_pool_is_last_ref(netmem)) continue; - page = __page_pool_put_page(pool, page, -1, allow_direct); + netmem = __page_pool_put_page(pool, netmem, -1, allow_direct); /* Approved for bulk recycling in ptr_ring cache */ - if (page) - data[bulk_len++] = page; + if (netmem) + data[bulk_len++] = (__force void *)netmem; } if (!bulk_len) @@ -835,98 +853,106 @@ void page_pool_put_page_bulk(struct page_pool *pool, void **data, * since put_page() with refcnt == 1 can be an expensive operation */ for (; i < bulk_len; i++) - page_pool_return_page(pool, data[i]); + page_pool_return_page(pool, (__force netmem_ref)data[i]); } EXPORT_SYMBOL(page_pool_put_page_bulk); -static struct page *page_pool_drain_frag(struct page_pool *pool, - struct page *page) +static netmem_ref page_pool_drain_frag(struct page_pool *pool, + netmem_ref netmem) { long drain_count = BIAS_MAX - pool->frag_users; /* Some user is still using the page frag */ - if (likely(page_pool_unref_page(page, drain_count))) - return NULL; + if (likely(page_pool_unref_netmem(netmem, drain_count))) + return 0; - if (__page_pool_page_can_be_recycled(page)) { - page_pool_dma_sync_for_device(pool, page, -1); - return page; + if (__page_pool_page_can_be_recycled(netmem)) { + page_pool_dma_sync_for_device(pool, netmem, -1); + return netmem; } - page_pool_return_page(pool, page); - return NULL; + page_pool_return_page(pool, netmem); + return 0; } static void page_pool_free_frag(struct page_pool *pool) { long drain_count = BIAS_MAX - pool->frag_users; - struct page *page = pool->frag_page; + netmem_ref netmem = pool->frag_page; - pool->frag_page = NULL; + pool->frag_page = 0; - if (!page || page_pool_unref_page(page, drain_count)) + if (!netmem || page_pool_unref_netmem(netmem, drain_count)) return; - page_pool_return_page(pool, page); + page_pool_return_page(pool, netmem); } -struct page *page_pool_alloc_frag(struct page_pool *pool, - unsigned int *offset, - unsigned int size, gfp_t gfp) +netmem_ref page_pool_alloc_frag_netmem(struct page_pool *pool, + unsigned int *offset, unsigned int size, + gfp_t gfp) { unsigned int max_size = PAGE_SIZE << pool->p.order; - struct page *page = pool->frag_page; + netmem_ref netmem = pool->frag_page; if (WARN_ON(size > max_size)) - return NULL; + return 0; size = ALIGN(size, dma_get_cache_alignment()); *offset = pool->frag_offset; - if (page && *offset + size > max_size) { - page = page_pool_drain_frag(pool, page); - if (page) { + if (netmem && *offset + size > max_size) { + netmem = page_pool_drain_frag(pool, netmem); + if (netmem) { alloc_stat_inc(pool, fast); goto frag_reset; } } - if (!page) { - page = page_pool_alloc_pages(pool, gfp); - if (unlikely(!page)) { - pool->frag_page = NULL; - return NULL; + if (!netmem) { + netmem = page_pool_alloc_netmem(pool, gfp); + if (unlikely(!netmem)) { + pool->frag_page = 0; + return 0; } - pool->frag_page = page; + pool->frag_page = netmem; frag_reset: pool->frag_users = 1; *offset = 0; pool->frag_offset = size; - page_pool_fragment_page(page, BIAS_MAX); - return page; + page_pool_fragment_netmem(netmem, BIAS_MAX); + return netmem; } pool->frag_users++; pool->frag_offset = *offset + size; alloc_stat_inc(pool, fast); - return page; + return netmem; +} +EXPORT_SYMBOL(page_pool_alloc_frag_netmem); + +struct page *page_pool_alloc_frag(struct page_pool *pool, unsigned int *offset, + unsigned int size, gfp_t gfp) +{ + return netmem_to_page(page_pool_alloc_frag_netmem(pool, offset, size, + gfp)); } EXPORT_SYMBOL(page_pool_alloc_frag); static void page_pool_empty_ring(struct page_pool *pool) { - struct page *page; + netmem_ref netmem; /* Empty recycle ring */ - while ((page = ptr_ring_consume_bh(&pool->ring))) { + while ((netmem = (__force netmem_ref)ptr_ring_consume_bh(&pool->ring))) { /* Verify the refcnt invariant of cached pages */ - if (!(page_ref_count(page) == 1)) + if (!(page_ref_count(netmem_to_page(netmem)) == 1)) pr_crit("%s() page_pool refcnt %d violation\n", - __func__, page_ref_count(page)); + __func__, netmem_ref_count(netmem)); - page_pool_return_page(pool, page); + page_pool_return_page(pool, netmem); } } @@ -942,7 +968,7 @@ static void __page_pool_destroy(struct page_pool *pool) static void page_pool_empty_alloc_cache_once(struct page_pool *pool) { - struct page *page; + netmem_ref netmem; if (pool->destroy_cnt) return; @@ -952,8 +978,8 @@ static void page_pool_empty_alloc_cache_once(struct page_pool *pool) * call concurrently. */ while (pool->alloc.count) { - page = pool->alloc.cache[--pool->alloc.count]; - page_pool_return_page(pool, page); + netmem = pool->alloc.cache[--pool->alloc.count]; + page_pool_return_page(pool, netmem); } } @@ -1059,15 +1085,15 @@ EXPORT_SYMBOL(page_pool_destroy); /* Caller must provide appropriate safe context, e.g. NAPI. */ void page_pool_update_nid(struct page_pool *pool, int new_nid) { - struct page *page; + netmem_ref netmem; trace_page_pool_update_nid(pool, new_nid); pool->p.nid = new_nid; /* Flush pool alloc cache, as refill will check NUMA node */ while (pool->alloc.count) { - page = pool->alloc.cache[--pool->alloc.count]; - page_pool_return_page(pool, page); + netmem = pool->alloc.cache[--pool->alloc.count]; + page_pool_return_page(pool, netmem); } } EXPORT_SYMBOL(page_pool_update_nid); diff --git a/net/core/skbuff.c b/net/core/skbuff.c index eb9a7e65b5c81..6acab82d2e1c9 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -1015,8 +1015,10 @@ int skb_cow_data_for_xdp(struct page_pool *pool, struct sk_buff **pskb, EXPORT_SYMBOL(skb_cow_data_for_xdp); #if IS_ENABLED(CONFIG_PAGE_POOL) -bool napi_pp_put_page(struct page *page) +bool napi_pp_put_page(netmem_ref netmem) { + struct page *page = netmem_to_page(netmem); + page = compound_head(page); /* page->pp_magic is OR'ed with PP_SIGNATURE after the allocation @@ -1029,7 +1031,7 @@ bool napi_pp_put_page(struct page *page) if (unlikely(!is_pp_page(page))) return false; - page_pool_put_full_page(page->pp, page, false); + page_pool_put_full_netmem(page->pp, page_to_netmem(page), false); return true; } @@ -1040,7 +1042,7 @@ static bool skb_pp_recycle(struct sk_buff *skb, void *data) { if (!IS_ENABLED(CONFIG_PAGE_POOL) || !skb->pp_recycle) return false; - return napi_pp_put_page(virt_to_page(data)); + return napi_pp_put_page(page_to_netmem(virt_to_page(data))); } /** From patchwork Tue Jun 25 19:53:54 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mina Almasry X-Patchwork-Id: 13711915 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 090A0C30659 for ; Tue, 25 Jun 2024 19:54:25 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 882656B0083; Tue, 25 Jun 2024 15:54:25 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 833446B00A8; Tue, 25 Jun 2024 15:54:25 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 65D6E6B00AA; Tue, 25 Jun 2024 15:54:25 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id 472F26B0083 for ; Tue, 25 Jun 2024 15:54:25 -0400 (EDT) Received: from smtpin01.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id F229F405A5 for ; Tue, 25 Jun 2024 19:54:24 +0000 (UTC) X-FDA: 82270462848.01.74F5700 Received: from mail-yb1-f202.google.com (mail-yb1-f202.google.com [209.85.219.202]) by imf04.hostedemail.com (Postfix) with ESMTP id E9C3B4000C for ; Tue, 25 Jun 2024 19:54:22 +0000 (UTC) Authentication-Results: imf04.hostedemail.com; dkim=pass header.d=google.com header.s=20230601 header.b=g4VLDuJb; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf04.hostedemail.com: domain of 3bSB7ZgsKCNQ0BC0IHOC8D06EE6B4.2ECB8DKN-CCAL02A.EH6@flex--almasrymina.bounces.google.com designates 209.85.219.202 as permitted sender) smtp.mailfrom=3bSB7ZgsKCNQ0BC0IHOC8D06EE6B4.2ECB8DKN-CCAL02A.EH6@flex--almasrymina.bounces.google.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1719345251; a=rsa-sha256; cv=none; b=N42MQ4lEll8uqKdItNro1rIU+NBJ/vakJMR6WOHMa0aZp3DZkL1MCZnl3E1fUduGXgAuI3 igtweTxrcn9HvBg89Ug7wj9WCgYbpSGuvu9wQTA0X9X5ZlhFK/JLYGLBIYhKF1HTLDrdmV KKkY8kfqWETlwdaeXYR4n/VUTrj+aa8= ARC-Authentication-Results: i=1; imf04.hostedemail.com; dkim=pass header.d=google.com header.s=20230601 header.b=g4VLDuJb; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf04.hostedemail.com: domain of 3bSB7ZgsKCNQ0BC0IHOC8D06EE6B4.2ECB8DKN-CCAL02A.EH6@flex--almasrymina.bounces.google.com designates 209.85.219.202 as permitted sender) smtp.mailfrom=3bSB7ZgsKCNQ0BC0IHOC8D06EE6B4.2ECB8DKN-CCAL02A.EH6@flex--almasrymina.bounces.google.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1719345251; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=bjAPzILbUVYRx+zz2CY188tcZ4jHaRy/nuInVrVQQH4=; b=viMme1DfklcDBrA6GLNefsURwd+q4NOoA7lwO45FjZ1m+3a3n4nPXO7RuilR6ovHijUYnT opM6C9X0RlNpXekjCmd8mksY1B0NOa9/ts8/uPgWx1685T9j7ar2PtxEVuQOZG9AnC3/XS tNbUjohrXIeYoORY6xSB/LRApvQ72Z8= Received: by mail-yb1-f202.google.com with SMTP id 3f1490d57ef6-dfeff1ae480so11394144276.2 for ; Tue, 25 Jun 2024 12:54:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1719345262; x=1719950062; darn=kvack.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=bjAPzILbUVYRx+zz2CY188tcZ4jHaRy/nuInVrVQQH4=; b=g4VLDuJbDAYJmT+gaFW32DayhJPcK/DDFpwhNuKC1t1EIeSPMhdL+ExcUr2BoauVPW yn2QhvyJO+s9YHU8suB429ifJ7Jp3LmP965UgkYMA5HwZWFqDa95zbUKzkQfeLSMCdDg +Lp3DpQnXbwCN3i5zYIti7mNzgJBSX+Cz97f55Lrhu3ZLM/bWes7ucLDRcoSCNcNlyc0 8SvI0XmpBQsQQZYP/o+gOi4X8CTu9eSYjjY0Cji1fX+vPICWKfHtt76x/Xbhv+oXiznA PdF4AezEonQI9+hDflSqeDhAEmhXFUpw6lj8d3EyoBTkXY2K/jB3xF0WfVAYWj2RP0nw Z/Hg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1719345262; x=1719950062; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=bjAPzILbUVYRx+zz2CY188tcZ4jHaRy/nuInVrVQQH4=; b=Mvnhym2curXq5TbjBgSULhaXXiCKA7oMNlUBJqpNzS8swuL00yiiCzxGjgyg1knvTA c4krS1eiiFhwomJJyGsxGf1x4E4zr9mD0tQGEDjlspV77TsM3RzIlQtBYMW3AtuekuOS qKLNvH5tLb3PU8E5urQREMN/HLVHe9NRlsuUE6D5Lkr8U7+uyYLK3heEiBO6AMgrON3y mZvYl7lYjlHypjGVpXMmjbfK6l2nOUVbgVpfOIZN7s/x2tcbhs/gZItSe+SYdgTceeUh JBFOp7fmeF8xETLSbtRJJOR1IshlilFtm0an53pUjXK5NSNEy5EE/Egmz9VUcjFzsvts Qw0A== X-Forwarded-Encrypted: i=1; AJvYcCWDUblOHNDOgVcSJFM+f2HqcJAa6IQajigT42hxrp/nWhbCVM1f7KZ7vvdzwkhS4MZvDE1FW/v2cg/+KV1EF2iDYwA= X-Gm-Message-State: AOJu0Yx48LaPhziLPN3GgOy9ToVZQzc3q5rBz3BWITHRA3pJ08pKpmiq xEQjoF73TCC6NuUn/GsanR3Waj6Fgska0g5blMbyec9UQVSRUwy9pNZ/VZ0fKpR1mHnzOhqcHbW ia5Wu/YaoKRDexZO/ZiwZqQ== X-Google-Smtp-Source: AGHT+IF0qDZz+xjY3OMttW/qKvt0MNTmtgQ4zuCxT0uz8+oubiBPWsrSJ3f7nVcrdkpHTu2xsXweJK3qKbGGQGlgsA== X-Received: from almasrymina.c.googlers.com ([fda3:e722:ac3:cc00:20:ed76:c0a8:4bc5]) (user=almasrymina job=sendgmr) by 2002:a05:6902:1026:b0:dfa:6ea5:c8d5 with SMTP id 3f1490d57ef6-e0303fbf0famr220970276.10.1719345261897; Tue, 25 Jun 2024 12:54:21 -0700 (PDT) Date: Tue, 25 Jun 2024 19:53:54 +0000 In-Reply-To: <20240625195407.1922912-1-almasrymina@google.com> Mime-Version: 1.0 References: <20240625195407.1922912-1-almasrymina@google.com> X-Mailer: git-send-email 2.45.2.741.gdbec12cfda-goog Message-ID: <20240625195407.1922912-7-almasrymina@google.com> Subject: [PATCH net-next v14 06/13] page_pool: devmem support From: Mina Almasry To: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-alpha@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, sparclinux@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-arch@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org Cc: Mina Almasry , Donald Hunter , Jakub Kicinski , "David S. Miller" , Eric Dumazet , Paolo Abeni , Jonathan Corbet , Richard Henderson , Ivan Kokshaysky , Matt Turner , Thomas Bogendoerfer , "James E.J. Bottomley" , Helge Deller , Andreas Larsson , Jesper Dangaard Brouer , Ilias Apalodimas , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Arnd Bergmann , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Steffen Klassert , Herbert Xu , David Ahern , Willem de Bruijn , Shuah Khan , Sumit Semwal , " =?utf-8?q?Christian_K=C3=B6nig?= " , Bagas Sanjaya , Christoph Hellwig , Nikolay Aleksandrov , Pavel Begunkov , David Wei , Jason Gunthorpe , Yunsheng Lin , Shailend Chand , Harshitha Ramamurthy , Shakeel Butt , Jeroen de Borst , Praveen Kaligineedi , linux-mm@kvack.org, Matthew Wilcox X-Rspamd-Queue-Id: E9C3B4000C X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: eyfta1nat9ue1obf4xfaednqoxwtm6jd X-HE-Tag: 1719345262-226262 X-HE-Meta: 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 fyuGCOlU 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Convert netmem to be a union of struct page and struct netmem. Overload the LSB of struct netmem* to indicate that it's a net_iov, otherwise it's a page. Currently these entries in struct page are rented by the page_pool and used exclusively by the net stack: struct { unsigned long pp_magic; struct page_pool *pp; unsigned long _pp_mapping_pad; unsigned long dma_addr; atomic_long_t pp_ref_count; }; Mirror these (and only these) entries into struct net_iov and implement netmem helpers that can access these common fields regardless of whether the underlying type is page or net_iov. Implement checks for net_iov in netmem helpers which delegate to mm APIs, to ensure net_iov are never passed to the mm stack. Signed-off-by: Mina Almasry Reviewed-by: Pavel Begunkov --- v13: - Move NET_IOV dependent changes to this patch. - Fixed comment (Pavel) - Applied Reviewed-by from Pavel. v9: https://lore.kernel.org/netdev/20240403002053.2376017-8-almasrymina@google.com/ - Remove CONFIG checks in netmem_is_net_iov() (Pavel/David/Jens) v7: - Remove static_branch_unlikely from netmem_to_net_iov(). We're getting better results from the fast path in bench_page_pool_simple tests without the static_branch_unlikely, and the addition of static_branch_unlikely doesn't improve performance of devmem TCP. Additionally only check netmem_to_net_iov() if CONFIG_DMA_SHARED_BUFFER is enabled, otherwise dmabuf net_iovs cannot exist anyway. net-next base: 8 cycle fast path. with static_branch_unlikely: 10 cycle fast path. without static_branch_unlikely: 9 cycle fast path. CONFIG_DMA_SHARED_BUFFER disabled: 8 cycle fast path as baseline. Performance of devmem TCP is at 95% line rate is regardless of static_branch_unlikely or not. v6: - Rebased on top of the merged netmem_ref type. - Rebased on top of the merged skb_pp_frag_ref() changes. v5: - Use netmem instead of page* with LSB set. - Use pp_ref_count for refcounting net_iov. - Removed many of the custom checks for netmem. v1: - Disable fragmentation support for iov properly. - fix napi_pp_put_page() path (Yunsheng). - Use pp_frag_count for devmem refcounting. Cc: linux-mm@kvack.org Cc: Matthew Wilcox --- include/net/netmem.h | 137 +++++++++++++++++++++++++++++-- include/net/page_pool/helpers.h | 25 +++--- include/trace/events/page_pool.h | 8 +- net/core/devmem.c | 3 + net/core/page_pool.c | 24 +++--- net/core/skbuff.c | 22 +++-- 6 files changed, 171 insertions(+), 48 deletions(-) diff --git a/include/net/netmem.h b/include/net/netmem.h index 664df8325ece5..35ad237fdf29e 100644 --- a/include/net/netmem.h +++ b/include/net/netmem.h @@ -9,14 +9,51 @@ #define _NET_NETMEM_H #include +#include /* net_iov */ +DECLARE_STATIC_KEY_FALSE(page_pool_mem_providers); + +/* We overload the LSB of the struct page pointer to indicate whether it's + * a page or net_iov. + */ +#define NET_IOV 0x01UL + struct net_iov { + unsigned long __unused_padding; + unsigned long pp_magic; + struct page_pool *pp; struct dmabuf_genpool_chunk_owner *owner; unsigned long dma_addr; + atomic_long_t pp_ref_count; }; +/* These fields in struct page are used by the page_pool and net stack: + * + * struct { + * unsigned long pp_magic; + * struct page_pool *pp; + * unsigned long _pp_mapping_pad; + * unsigned long dma_addr; + * atomic_long_t pp_ref_count; + * }; + * + * We mirror the page_pool fields here so the page_pool can access these fields + * without worrying whether the underlying fields belong to a page or net_iov. + * + * The non-net stack fields of struct page are private to the mm stack and must + * never be mirrored to net_iov. + */ +#define NET_IOV_ASSERT_OFFSET(pg, iov) \ + static_assert(offsetof(struct page, pg) == \ + offsetof(struct net_iov, iov)) +NET_IOV_ASSERT_OFFSET(pp_magic, pp_magic); +NET_IOV_ASSERT_OFFSET(pp, pp); +NET_IOV_ASSERT_OFFSET(dma_addr, dma_addr); +NET_IOV_ASSERT_OFFSET(pp_ref_count, pp_ref_count); +#undef NET_IOV_ASSERT_OFFSET + static inline struct dmabuf_genpool_chunk_owner * net_iov_owner(const struct net_iov *niov) { @@ -47,20 +84,22 @@ net_iov_binding(const struct net_iov *niov) */ typedef unsigned long __bitwise netmem_ref; +static inline bool netmem_is_net_iov(const netmem_ref netmem) +{ + return (__force unsigned long)netmem & NET_IOV; +} + /* This conversion fails (returns NULL) if the netmem_ref is not struct page * backed. - * - * Currently struct page is the only possible netmem, and this helper never - * fails. */ static inline struct page *netmem_to_page(netmem_ref netmem) { + if (WARN_ON_ONCE(netmem_is_net_iov(netmem))) + return NULL; + return (__force struct page *)netmem; } -/* Converting from page to netmem is always safe, because a page can always be - * a netmem. - */ static inline netmem_ref page_to_netmem(struct page *page) { return (__force netmem_ref)page; @@ -68,17 +107,103 @@ static inline netmem_ref page_to_netmem(struct page *page) static inline int netmem_ref_count(netmem_ref netmem) { + /* The non-pp refcount of net_iov is always 1. On net_iov, we only + * support pp refcounting which uses the pp_ref_count field. + */ + if (netmem_is_net_iov(netmem)) + return 1; + return page_ref_count(netmem_to_page(netmem)); } static inline unsigned long netmem_to_pfn(netmem_ref netmem) { + if (netmem_is_net_iov(netmem)) + return 0; + return page_to_pfn(netmem_to_page(netmem)); } +static inline struct net_iov *__netmem_clear_lsb(netmem_ref netmem) +{ + return (struct net_iov *)((__force unsigned long)netmem & ~NET_IOV); +} + +static inline unsigned long netmem_get_pp_magic(netmem_ref netmem) +{ + return __netmem_clear_lsb(netmem)->pp_magic; +} + +static inline void netmem_or_pp_magic(netmem_ref netmem, unsigned long pp_magic) +{ + __netmem_clear_lsb(netmem)->pp_magic |= pp_magic; +} + +static inline void netmem_clear_pp_magic(netmem_ref netmem) +{ + __netmem_clear_lsb(netmem)->pp_magic = 0; +} + +static inline struct page_pool *netmem_get_pp(netmem_ref netmem) +{ + return __netmem_clear_lsb(netmem)->pp; +} + +static inline void netmem_set_pp(netmem_ref netmem, struct page_pool *pool) +{ + __netmem_clear_lsb(netmem)->pp = pool; +} + +static inline unsigned long netmem_get_dma_addr(netmem_ref netmem) +{ + return __netmem_clear_lsb(netmem)->dma_addr; +} + +static inline void netmem_set_dma_addr(netmem_ref netmem, + unsigned long dma_addr) +{ + __netmem_clear_lsb(netmem)->dma_addr = dma_addr; +} + +static inline atomic_long_t *netmem_get_pp_ref_count_ref(netmem_ref netmem) +{ + return &__netmem_clear_lsb(netmem)->pp_ref_count; +} + +static inline bool netmem_is_pref_nid(netmem_ref netmem, int pref_nid) +{ + /* Assume net_iov are on the preferred node without actually + * checking... + * + * This check is only used to check for recycling memory in the page + * pool's fast paths. Currently the only implementation of net_iov + * is dmabuf device memory. It's a deliberate decision by the user to + * bind a certain dmabuf to a certain netdev, and the netdev rx queue + * would not be able to reallocate memory from another dmabuf that + * exists on the preferred node, so, this check doesn't make much sense + * in this case. Assume all net_iovs can be recycled for now. + */ + if (netmem_is_net_iov(netmem)) + return true; + + return page_to_nid(netmem_to_page(netmem)) == pref_nid; +} + static inline netmem_ref netmem_compound_head(netmem_ref netmem) { + /* niov are never compounded */ + if (netmem_is_net_iov(netmem)) + return netmem; + return page_to_netmem(compound_head(netmem_to_page(netmem))); } +static inline void *netmem_address(netmem_ref netmem) +{ + if (netmem_is_net_iov(netmem)) + return NULL; + + return page_address(netmem_to_page(netmem)); +} + #endif /* _NET_NETMEM_H */ diff --git a/include/net/page_pool/helpers.h b/include/net/page_pool/helpers.h index 2b43a893c619d..0c95594ce8e1c 100644 --- a/include/net/page_pool/helpers.h +++ b/include/net/page_pool/helpers.h @@ -216,7 +216,7 @@ page_pool_get_dma_dir(const struct page_pool *pool) static inline void page_pool_fragment_netmem(netmem_ref netmem, long nr) { - atomic_long_set(&netmem_to_page(netmem)->pp_ref_count, nr); + atomic_long_set(netmem_get_pp_ref_count_ref(netmem), nr); } /** @@ -244,7 +244,7 @@ static inline void page_pool_fragment_page(struct page *page, long nr) static inline long page_pool_unref_netmem(netmem_ref netmem, long nr) { - struct page *page = netmem_to_page(netmem); + atomic_long_t *pp_ref_count = netmem_get_pp_ref_count_ref(netmem); long ret; /* If nr == pp_ref_count then we have cleared all remaining @@ -261,19 +261,19 @@ static inline long page_pool_unref_netmem(netmem_ref netmem, long nr) * initially, and only overwrite it when the page is partitioned into * more than one piece. */ - if (atomic_long_read(&page->pp_ref_count) == nr) { + if (atomic_long_read(pp_ref_count) == nr) { /* As we have ensured nr is always one for constant case using * the BUILD_BUG_ON(), only need to handle the non-constant case * here for pp_ref_count draining, which is a rare case. */ BUILD_BUG_ON(__builtin_constant_p(nr) && nr != 1); if (!__builtin_constant_p(nr)) - atomic_long_set(&page->pp_ref_count, 1); + atomic_long_set(pp_ref_count, 1); return 0; } - ret = atomic_long_sub_return(nr, &page->pp_ref_count); + ret = atomic_long_sub_return(nr, pp_ref_count); WARN_ON(ret < 0); /* We are the last user here too, reset pp_ref_count back to 1 to @@ -282,7 +282,7 @@ static inline long page_pool_unref_netmem(netmem_ref netmem, long nr) * page_pool_unref_page() currently. */ if (unlikely(!ret)) - atomic_long_set(&page->pp_ref_count, 1); + atomic_long_set(pp_ref_count, 1); return ret; } @@ -401,9 +401,7 @@ static inline void page_pool_free_va(struct page_pool *pool, void *va, static inline dma_addr_t page_pool_get_dma_addr_netmem(netmem_ref netmem) { - struct page *page = netmem_to_page(netmem); - - dma_addr_t ret = page->dma_addr; + dma_addr_t ret = netmem_get_dma_addr(netmem); if (PAGE_POOL_32BIT_ARCH_WITH_64BIT_DMA) ret <<= PAGE_SHIFT; @@ -426,18 +424,17 @@ static inline dma_addr_t page_pool_get_dma_addr(const struct page *page) static inline bool page_pool_set_dma_addr_netmem(netmem_ref netmem, dma_addr_t addr) { - struct page *page = netmem_to_page(netmem); - if (PAGE_POOL_32BIT_ARCH_WITH_64BIT_DMA) { - page->dma_addr = addr >> PAGE_SHIFT; + netmem_set_dma_addr(netmem, addr >> PAGE_SHIFT); /* We assume page alignment to shave off bottom bits, * if this "compression" doesn't work we need to drop. */ - return addr != (dma_addr_t)page->dma_addr << PAGE_SHIFT; + return addr != (dma_addr_t)netmem_get_dma_addr(netmem) + << PAGE_SHIFT; } - page->dma_addr = addr; + netmem_set_dma_addr(netmem, addr); return false; } diff --git a/include/trace/events/page_pool.h b/include/trace/events/page_pool.h index 543e54e432a18..845c5f1f62f95 100644 --- a/include/trace/events/page_pool.h +++ b/include/trace/events/page_pool.h @@ -60,9 +60,9 @@ TRACE_EVENT(page_pool_state_release, __entry->pfn = netmem_to_pfn(netmem); ), - TP_printk("page_pool=%p netmem=%p pfn=0x%lx release=%u", + TP_printk("page_pool=%p netmem=%p is_net_iov=%lu pfn=0x%lx release=%u", __entry->pool, (void *)__entry->netmem, - __entry->pfn, __entry->release) + __entry->netmem & NET_IOV, __entry->pfn, __entry->release) ); TRACE_EVENT(page_pool_state_hold, @@ -86,9 +86,9 @@ TRACE_EVENT(page_pool_state_hold, __entry->pfn = netmem_to_pfn(netmem); ), - TP_printk("page_pool=%p netmem=%p pfn=0x%lx hold=%u", + TP_printk("page_pool=%p netmem=%p is_net_iov=%lu, pfn=0x%lx hold=%u", __entry->pool, (void *)__entry->netmem, - __entry->pfn, __entry->hold) + __entry->netmem & NET_IOV, __entry->pfn, __entry->hold) ); TRACE_EVENT(page_pool_update_nid, diff --git a/net/core/devmem.c b/net/core/devmem.c index aeee25c91b844..0da3295188f68 100644 --- a/net/core/devmem.c +++ b/net/core/devmem.c @@ -80,7 +80,10 @@ net_devmem_alloc_dmabuf(struct net_devmem_dmabuf_binding *binding) index = offset / PAGE_SIZE; niov = &owner->niovs[index]; + niov->pp_magic = 0; + niov->pp = NULL; niov->dma_addr = 0; + atomic_long_set(&niov->pp_ref_count, 0); net_devmem_dmabuf_binding_get(binding); diff --git a/net/core/page_pool.c b/net/core/page_pool.c index a5957d3359762..e65476e9956f3 100644 --- a/net/core/page_pool.c +++ b/net/core/page_pool.c @@ -26,6 +26,8 @@ #include "page_pool_priv.h" +DEFINE_STATIC_KEY_FALSE(page_pool_mem_providers); + #define DEFER_TIME (msecs_to_jiffies(1000)) #define DEFER_WARN_INTERVAL (60 * HZ) @@ -357,7 +359,7 @@ static noinline netmem_ref page_pool_refill_alloc_cache(struct page_pool *pool) if (unlikely(!netmem)) break; - if (likely(page_to_nid(netmem_to_page(netmem)) == pref_nid)) { + if (likely(netmem_is_pref_nid(netmem, pref_nid))) { pool->alloc.cache[pool->alloc.count++] = netmem; } else { /* NUMA mismatch; @@ -453,10 +455,8 @@ static bool page_pool_dma_map(struct page_pool *pool, netmem_ref netmem) static void page_pool_set_pp_info(struct page_pool *pool, netmem_ref netmem) { - struct page *page = netmem_to_page(netmem); - - page->pp = pool; - page->pp_magic |= PP_SIGNATURE; + netmem_set_pp(netmem, pool); + netmem_or_pp_magic(netmem, PP_SIGNATURE); /* Ensuring all pages have been split into one fragment initially: * page_pool_set_pp_info() is only called once for every page when it @@ -471,10 +471,8 @@ static void page_pool_set_pp_info(struct page_pool *pool, netmem_ref netmem) static void page_pool_clear_pp_info(netmem_ref netmem) { - struct page *page = netmem_to_page(netmem); - - page->pp_magic = 0; - page->pp = NULL; + netmem_clear_pp_magic(netmem); + netmem_set_pp(netmem, NULL); } static struct page *__page_pool_alloc_page_order(struct page_pool *pool, @@ -691,8 +689,9 @@ static bool page_pool_recycle_in_cache(netmem_ref netmem, static bool __page_pool_page_can_be_recycled(netmem_ref netmem) { - return page_ref_count(netmem_to_page(netmem)) == 1 && - !page_is_pfmemalloc(netmem_to_page(netmem)); + return netmem_is_net_iov(netmem) || + (page_ref_count(netmem_to_page(netmem)) == 1 && + !page_is_pfmemalloc(netmem_to_page(netmem))); } /* If the page refcnt == 1, this will try to recycle the page. @@ -727,6 +726,7 @@ __page_pool_put_page(struct page_pool *pool, netmem_ref netmem, /* Page found as candidate for recycling */ return netmem; } + /* Fallback/non-XDP mode: API user have elevated refcnt. * * Many drivers split up the page into fragments, and some @@ -948,7 +948,7 @@ static void page_pool_empty_ring(struct page_pool *pool) /* Empty recycle ring */ while ((netmem = (__force netmem_ref)ptr_ring_consume_bh(&pool->ring))) { /* Verify the refcnt invariant of cached pages */ - if (!(page_ref_count(netmem_to_page(netmem)) == 1)) + if (!(netmem_ref_count(netmem) == 1)) pr_crit("%s() page_pool refcnt %d violation\n", __func__, netmem_ref_count(netmem)); diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 6acab82d2e1c9..c03d53ec69bee 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -917,9 +917,9 @@ static void skb_clone_fraglist(struct sk_buff *skb) skb_get(list); } -static bool is_pp_page(struct page *page) +static bool is_pp_netmem(netmem_ref netmem) { - return (page->pp_magic & ~0x3UL) == PP_SIGNATURE; + return (netmem_get_pp_magic(netmem) & ~0x3UL) == PP_SIGNATURE; } int skb_pp_cow_data(struct page_pool *pool, struct sk_buff **pskb, @@ -1017,9 +1017,7 @@ EXPORT_SYMBOL(skb_cow_data_for_xdp); #if IS_ENABLED(CONFIG_PAGE_POOL) bool napi_pp_put_page(netmem_ref netmem) { - struct page *page = netmem_to_page(netmem); - - page = compound_head(page); + netmem = netmem_compound_head(netmem); /* page->pp_magic is OR'ed with PP_SIGNATURE after the allocation * in order to preserve any existing bits, such as bit 0 for the @@ -1028,10 +1026,10 @@ bool napi_pp_put_page(netmem_ref netmem) * and page_is_pfmemalloc() is checked in __page_pool_put_page() * to avoid recycling the pfmemalloc page. */ - if (unlikely(!is_pp_page(page))) + if (unlikely(!is_pp_netmem(netmem))) return false; - page_pool_put_full_netmem(page->pp, page_to_netmem(page), false); + page_pool_put_full_netmem(netmem_get_pp(netmem), netmem, false); return true; } @@ -1058,7 +1056,7 @@ static bool skb_pp_recycle(struct sk_buff *skb, void *data) static int skb_pp_frag_ref(struct sk_buff *skb) { struct skb_shared_info *shinfo; - struct page *head_page; + netmem_ref head_netmem; int i; if (!skb->pp_recycle) @@ -1067,11 +1065,11 @@ static int skb_pp_frag_ref(struct sk_buff *skb) shinfo = skb_shinfo(skb); for (i = 0; i < shinfo->nr_frags; i++) { - head_page = compound_head(skb_frag_page(&shinfo->frags[i])); - if (likely(is_pp_page(head_page))) - page_pool_ref_page(head_page); + head_netmem = netmem_compound_head(shinfo->frags[i].netmem); + if (likely(is_pp_netmem(head_netmem))) + page_pool_ref_netmem(head_netmem); else - page_ref_inc(head_page); + page_ref_inc(netmem_to_page(head_netmem)); } return 0; }