From patchwork Tue Mar 5 02:01:37 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mina Almasry X-Patchwork-Id: 13581485 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id EB36FC48BF6 for ; Tue, 5 Mar 2024 02:02:08 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 9F22A112823; Tue, 5 Mar 2024 02:02:04 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.b="4fg3pNHC"; dkim-atps=neutral Received: from mail-yw1-f202.google.com (mail-yw1-f202.google.com [209.85.128.202]) by gabe.freedesktop.org (Postfix) with ESMTPS id EF845112820 for ; Tue, 5 Mar 2024 02:02:02 +0000 (UTC) Received: by mail-yw1-f202.google.com with SMTP id 00721157ae682-60802b0afd2so47273717b3.1 for ; Mon, 04 Mar 2024 18:02:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1709604122; x=1710208922; darn=lists.freedesktop.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=QOWmAeQMGWMC5aJa64Dg0AHzjb+8gPpNDHS7ziT/3ac=; b=4fg3pNHCVS8+tFc3WL1El2qc5UjGGW57BIc6RLV7ng2v/LjIvFg4OGu+KVr73gRqVv XYCThooyg8C4d1chm6RrfdhVsm5APbdgKizKFk3721tMwwvJ7Gj/jxIWlzqxhVaEnkyP xu8nTMUSdNCDkuiLynNTpLnWQ6VquoQxF5u21DqMMcf0qYogNZQ0nXz7ijyfdoyL5fnn Uv86PYi2p0cMEgaUEoO6HkF+kVr7ebKRd6FczrrFEUv23S9gS5TprdaqtqCM0yTbIFPh 9dD39emADpZwDoCMMFgMlVEFwiy7Q5POz/WwWeRfWJBUGmLDbKJR5s9bOjB1Jljx9E7+ blow== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1709604122; x=1710208922; 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=QOWmAeQMGWMC5aJa64Dg0AHzjb+8gPpNDHS7ziT/3ac=; b=RbaDKi03sD9Xd4ZJHC6KNFfpzEg5MY9R0a44V09DwpaNYyNBCxOhY+wSYyGO+diMc5 UTvA2nO47PezikPR/7yGHn8WcGvudx4m7CYV/5UnMQTh6pUO1zS3tJMPOjEeXe0//2sP 0tkc+FfOAALHF/Wekgq5C9uvkjUttViv0pwe3/cDitr8zDxhnig5gXO3PKoM8W8w3twZ gEFmU9E9g7/ZatX7yXpytqTvQko8hY1DxSmmiNl/ykLga6LhiW6D5fpf+qwi4NM5JV/c ptnTFSEA79DWaU+vrOgejSCBxWPwpyv1uBQ4+NBL3t64QzVm0iujQpfbqGcXYCh6edMo hrfQ== X-Forwarded-Encrypted: i=1; AJvYcCVxxeXnLOBKvJfD1Re91ubzq8wK6tyn3YDXgS1DSwKVcNXTLGhnaS6XFUEd6dTFbx8sxonZ0r3JfVLteAXCG7wgUjQQoCeMhORc+ykN81Z2 X-Gm-Message-State: AOJu0YyUc3s3zErBNf+2BUp3m0j15hx6R4XUdDOhNNq1fOxf8drQajbk xwzVbMD0z7EWVmYhOYwBpNZHNsdoVztV7WIRyqlxH0nAcCWrUQXstWSHxCOju4PP3EGpjyBA89b qsIJIlo+JWuJGo8L5nGkF6Q== X-Google-Smtp-Source: AGHT+IG6KeWQw0XbqPbYmQM0P/6OwcAsrFu5mozN13W1clztdP6zot9Fisjb9bkCfEQNwnMXpfHNCZGrzpwJASvg9w== X-Received: from almasrymina.svl.corp.google.com ([2620:15c:2c4:200:b614:914c:63cd:3830]) (user=almasrymina job=sendgmr) by 2002:a81:4c93:0:b0:609:3a33:bacc with SMTP id z141-20020a814c93000000b006093a33baccmr264479ywa.5.1709604121833; Mon, 04 Mar 2024 18:02:01 -0800 (PST) Date: Mon, 4 Mar 2024 18:01:37 -0800 In-Reply-To: <20240305020153.2787423-1-almasrymina@google.com> Mime-Version: 1.0 References: <20240305020153.2787423-1-almasrymina@google.com> X-Mailer: git-send-email 2.44.0.rc1.240.g4c46232300-goog Message-ID: <20240305020153.2787423-3-almasrymina@google.com> Subject: [RFC PATCH net-next v6 02/15] net: page_pool: create hooks for custom page providers 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 , "David S. Miller" , Eric Dumazet , Jakub Kicinski , 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 , David Ahern , Willem de Bruijn , Shuah Khan , Sumit Semwal , " =?utf-8?q?Christian_K=C3=B6nig?= " , Pavel Begunkov , David Wei , Jason Gunthorpe , Yunsheng Lin , Shailend Chand , Harshitha Ramamurthy , Shakeel Butt , Jeroen de Borst , Praveen Kaligineedi X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Jakub Kicinski The page providers which try to reuse the same pages will need to hold onto the ref, even if page gets released from the pool - as in releasing the page from the pp just transfers the "ownership" reference from pp to the provider, and provider will wait for other references to be gone before feeding this page back into the pool. 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; I only added minor edits to make this workable with device memory TCP, and removed some hacky test code. This is a critical dependency of device memory TCP and thus I'm pulling it into this series to make it revewable and mergeable. RFC v3 -> v1 - Removed unusued mem_provider. (Yunsheng). - Replaced memory_provider & mp_priv with netdev_rx_queue (Jakub). --- include/net/page_pool/types.h | 12 ++++++++++ net/core/page_pool.c | 43 +++++++++++++++++++++++++++++++---- 2 files changed, 50 insertions(+), 5 deletions(-) diff --git a/include/net/page_pool/types.h b/include/net/page_pool/types.h index 5e43a08d3231..ffe5f31fb0da 100644 --- a/include/net/page_pool/types.h +++ b/include/net/page_pool/types.h @@ -52,6 +52,7 @@ struct pp_alloc_cache { * @dev: device, for DMA pre-mapping purposes * @netdev: netdev this pool will serve (leave as NULL if none or multiple) * @napi: NAPI which is the sole consumer of pages, otherwise NULL + * @queue: struct netdev_rx_queue this page_pool is being created for. * @dma_dir: DMA mapping direction * @max_len: max DMA sync memory size for PP_FLAG_DMA_SYNC_DEV * @offset: DMA sync address offset for PP_FLAG_DMA_SYNC_DEV @@ -64,6 +65,7 @@ struct page_pool_params { int nid; struct device *dev; struct napi_struct *napi; + struct netdev_rx_queue *queue; enum dma_data_direction dma_dir; unsigned int max_len; unsigned int offset; @@ -126,6 +128,13 @@ struct page_pool_stats { }; #endif +struct memory_provider_ops { + int (*init)(struct page_pool *pool); + void (*destroy)(struct page_pool *pool); + struct page *(*alloc_pages)(struct page_pool *pool, gfp_t gfp); + bool (*release_page)(struct page_pool *pool, struct page *page); +}; + struct page_pool { struct page_pool_params_fast p; @@ -176,6 +185,9 @@ struct page_pool { */ struct ptr_ring ring; + void *mp_priv; + const struct memory_provider_ops *mp_ops; + #ifdef CONFIG_PAGE_POOL_STATS /* recycle stats are per-cpu to avoid locking */ struct page_pool_recycle_stats __percpu *recycle_stats; diff --git a/net/core/page_pool.c b/net/core/page_pool.c index d706fe5548df..8776fcad064a 100644 --- a/net/core/page_pool.c +++ b/net/core/page_pool.c @@ -25,6 +25,8 @@ #include "page_pool_priv.h" +static DEFINE_STATIC_KEY_FALSE(page_pool_mem_providers); + #define DEFER_TIME (msecs_to_jiffies(1000)) #define DEFER_WARN_INTERVAL (60 * HZ) @@ -177,6 +179,7 @@ static int page_pool_init(struct page_pool *pool, int cpuid) { unsigned int ring_qsize = 1024; /* Default */ + int err; memcpy(&pool->p, ¶ms->fast, sizeof(pool->p)); memcpy(&pool->slow, ¶ms->slow, sizeof(pool->slow)); @@ -248,10 +251,25 @@ static int page_pool_init(struct page_pool *pool, /* Driver calling page_pool_create() also call page_pool_destroy() */ refcount_set(&pool->user_cnt, 1); + if (pool->mp_ops) { + err = pool->mp_ops->init(pool); + if (err) { + pr_warn("%s() mem-provider init failed %d\n", + __func__, err); + goto free_ptr_ring; + } + + static_branch_inc(&page_pool_mem_providers); + } + if (pool->p.flags & PP_FLAG_DMA_MAP) get_device(pool->p.dev); return 0; + +free_ptr_ring: + ptr_ring_cleanup(&pool->ring, NULL); + return err; } static void page_pool_uninit(struct page_pool *pool) @@ -546,7 +564,10 @@ struct page *page_pool_alloc_pages(struct page_pool *pool, gfp_t gfp) return page; /* Slow-path: cache empty, do real allocation */ - page = __page_pool_alloc_pages_slow(pool, gfp); + if (static_branch_unlikely(&page_pool_mem_providers) && pool->mp_ops) + page = pool->mp_ops->alloc_pages(pool, gfp); + else + page = __page_pool_alloc_pages_slow(pool, gfp); return page; } EXPORT_SYMBOL(page_pool_alloc_pages); @@ -603,10 +624,13 @@ void __page_pool_release_page_dma(struct page_pool *pool, struct page *page) void page_pool_return_page(struct page_pool *pool, struct page *page) { int count; + bool put; - __page_pool_release_page_dma(pool, page); - - page_pool_clear_pp_info(page); + put = true; + if (static_branch_unlikely(&page_pool_mem_providers) && pool->mp_ops) + put = pool->mp_ops->release_page(pool, page); + else + __page_pool_release_page_dma(pool, page); /* This may be the last page returned, releasing the pool, so * it is not safe to reference pool afterwards. @@ -614,7 +638,10 @@ void page_pool_return_page(struct page_pool *pool, struct page *page) count = atomic_inc_return_relaxed(&pool->pages_state_release_cnt); trace_page_pool_state_release(pool, page, count); - put_page(page); + if (put) { + page_pool_clear_pp_info(page); + put_page(page); + } /* 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). @@ -884,6 +911,12 @@ static void __page_pool_destroy(struct page_pool *pool) page_pool_unlist(pool); page_pool_uninit(pool); + + if (pool->mp_ops) { + pool->mp_ops->destroy(pool); + static_branch_dec(&page_pool_mem_providers); + } + kfree(pool); }