From patchwork Mon Dec 18 02:40:08 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mina Almasry X-Patchwork-Id: 13497482 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 E1AD4C35274 for ; Mon, 18 Dec 2023 19:27:36 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 2068510E08A; Mon, 18 Dec 2023 19:27:36 +0000 (UTC) Received: from mail-pj1-f73.google.com (mail-pj1-f73.google.com [209.85.216.73]) by gabe.freedesktop.org (Postfix) with ESMTPS id 6C18110E08A for ; Mon, 18 Dec 2023 19:27:34 +0000 (UTC) Received: by mail-pj1-f73.google.com with SMTP id 98e67ed59e1d1-28b0fe75032so3809791a91.3 for ; Mon, 18 Dec 2023 11:27:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1702927654; x=1703532454; 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=+YH1G0kDpPKfZZEjFhgAU3QdHJHUSt1BHlcFmevn2mU=; b=ANcRok47Ps1zFrmFo5Q+XU2I5ADbP0MJ2pk3554Gp5aFQRYxyaK34nyTqBzuMimyBl s/aTC6HdFR53lx2dXn0Tb2p2pEHsa0zT2bjEL+gXcYELAAw/rDyc8I5cgRh5bkUyYRu6 /+1ChpAVTf1MmNCXIJQExjEs5z/YjwVeUFm4YgOarLXRY+wgR2rmE1Vz4NKqZ+cojxL4 jZblQApnaNUrfwFL5YaU00k2qzWv5lhts3iW7wEzD6O6nHhrNvpOtyWj5SSZAA+Ik3lg LwKIaR/+TC3HwyBvhz9NwKqpXthvaj9KO0HeY7SuvIzM/Pa63wZQEsuyCfKvxDiyC5jD md8A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1702927654; x=1703532454; 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=+YH1G0kDpPKfZZEjFhgAU3QdHJHUSt1BHlcFmevn2mU=; b=OEITKT0CmHzn9uKpUQVkKWaogJ0PFTWyqgBJepl/d+1DcG8XtRQ4+HdXj3+y3BBn7W uDSlwfRauIJGa0eM9n/8mODNwPlw/JXuvZBiOZK/J0IM5QkInHnuzMW2Mx0q8rpiEiak gBKYbMi+QvkPAKIHDVYwmEwY0PMKddYJJrL/Mp1jvWI7yndQBNYJn8KSUH4jK0zfpY6Y 0HjWE91/pcf5UoO/9ArPi4ZVFMVU0laXb7tSt9I2NkQcRBYj+4krfpsDUyouXIuqSz8/ ymomedpgM56wLSX8AHhxBy4tWDosocpSi/wWT0l6247XgbAwRwgDQhH04rEbEvIHXFM/ f5Jg== X-Gm-Message-State: AOJu0YxVlb+7OvVXRZVYIrBfZV0lzHtTUU6yY0E+FjiJAyp5D9gt5pCW 9wYlTB8WSKXJJ/qvqGoqJ/X3l+LgApJ0qsgolw== X-Google-Smtp-Source: AGHT+IGyNVyC8TQYcSl7tOFIP1crxw1OFLyn3GH7wrDXvkjGpNa9AqliMNlbsLNzaUBAWjdn+tFONPSoDQnsGxxJ6Q== X-Received: from almasrymina.svl.corp.google.com ([2620:15c:2c4:200:5cbf:3534:fb34:758e]) (user=almasrymina job=sendgmr) by 2002:a25:2e0a:0:b0:dbc:c4a7:3bf7 with SMTP id u10-20020a252e0a000000b00dbcc4a73bf7mr1342548ybu.1.1702867230794; Sun, 17 Dec 2023 18:40:30 -0800 (PST) Date: Sun, 17 Dec 2023 18:40:08 -0800 In-Reply-To: <20231218024024.3516870-1-almasrymina@google.com> Mime-Version: 1.0 References: <20231218024024.3516870-1-almasrymina@google.com> X-Mailer: git-send-email 2.43.0.472.g3155946c3a-goog Message-ID: <20231218024024.3516870-2-almasrymina@google.com> Subject: [RFC PATCH net-next v5 01/14] net: page_pool: create hooks for custom page providers From: Mina Almasry To: Mathieu Desnoyers , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , 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 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: , Cc: Pavel Begunkov , Alexei Starovoitov , "James E.J. Bottomley" , Eric Dumazet , Shuah Khan , Sumit Semwal , Mina Almasry , Willem de Bruijn , Jeroen de Borst , Daniel Borkmann , Jonathan Corbet , Helge Deller , Andrii Nakryiko , Jason Gunthorpe , Jakub Kicinski , Matt Turner , Paolo Abeni , Jesper Dangaard Brouer , Arnd Bergmann , Richard Henderson , Steven Rostedt , Shailend Chand , Ivan Kokshaysky , Harshitha Ramamurthy , Praveen Kaligineedi , Thomas Bogendoerfer , David Ahern , Ilias Apalodimas , David Wei , =?utf-8?q?Christian_K=C3=B6nig?= , Yunsheng Lin , Masami Hiramatsu , Shakeel Butt , "David S. Miller" 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 76481c465375..4c090e86e550 100644 --- a/include/net/page_pool/types.h +++ b/include/net/page_pool/types.h @@ -51,6 +51,7 @@ 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 @@ -63,6 +64,7 @@ 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; @@ -125,6 +127,13 @@ 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; @@ -174,6 +183,9 @@ 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 dd5a72533f2b..45bb4210412d 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) @@ -174,6 +176,7 @@ static int page_pool_init(struct page_pool *pool, const struct page_pool_params *params) { unsigned int ring_qsize = 1024; /* Default */ + int err; memcpy(&pool->p, ¶ms->fast, sizeof(pool->p)); memcpy(&pool->slow, ¶ms->slow, sizeof(pool->slow)); @@ -234,10 +237,25 @@ 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) @@ -519,7 +537,10 @@ 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); @@ -576,10 +597,13 @@ 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. @@ -587,7 +611,10 @@ 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). @@ -857,6 +884,12 @@ 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); }