From patchwork Tue Mar 26 22:50:33 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mina Almasry X-Patchwork-Id: 13605283 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 E9A0ACD11DF for ; Tue, 26 Mar 2024 22:51:06 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 02F5D10F455; Tue, 26 Mar 2024 22:51:04 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.b="rPGvzTa0"; dkim-atps=neutral Received: from mail-yw1-f201.google.com (mail-yw1-f201.google.com [209.85.128.201]) by gabe.freedesktop.org (Postfix) with ESMTPS id 67ACD10F453 for ; Tue, 26 Mar 2024 22:51:00 +0000 (UTC) Received: by mail-yw1-f201.google.com with SMTP id 00721157ae682-610c23abd1fso117458987b3.0 for ; Tue, 26 Mar 2024 15:51:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1711493459; x=1712098259; 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=SMZD5Fx+tGtryKNtQbebtNncYR/IyHsK1jvhbQ4zNC0=; b=rPGvzTa0ty+2fhqqFXb1/sTgIS0T7qnlx3D+RZ+J1lke6DNiWLgjofe7LGxofz1YBp aTBr93VoOWsABFDLe3GieNNezeL5nvCKICzYY0p3BuKbggS6SgU6YeLkvqK+RAoAnkDE 6PT8BbNnsO+bdS5mAKEw7rRAAin5aq1Uuu34+IJyVC/i0oiWkWVd9n4/DbWf41Ge1KqE /8fZpKAEepJlHRgibBtOcLz9Stv7p0/iYNPKrsJoPxHEkgiS3kXThsVJY3u8/6onps7c nyH1X21ADM+zBWDFpenFvgiyXnwaeA7b2Ef1eUKjf20/bLcRLmrJ8KHCrMER5yvwE14+ h1Tg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1711493459; x=1712098259; 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=SMZD5Fx+tGtryKNtQbebtNncYR/IyHsK1jvhbQ4zNC0=; b=JnN0XYHFBcAFrjEr8hWekf4YE6MHmqFJHx1/xVYuonb3oZcTpStHJhS49rNWm6FUyG sIw7bAg0BiQvMBGQjkYAJTpl95f9qwmHEfC3mGZnjzKKMt1SJoKCYKTUKml9GgM46FdV ORjk7ttBTvYfjTEAY48xQzWEK37hoPKkC58gtBqANaaiMzlMPoVbVHL4RB7kLUDzxAMv y0BKNiqRx5U1k9ZEIJ/7L2zYiCPm600SEAXV9gssChknz/rVeCRnJdzI9L9D393ExGzS JdBb4oQbFL2ZzKDdPQyu/7sgfG/jZX7UyTb8KdKi/n8wvpm1I/BOL1bDiYn4nSYc676k Ajcg== X-Forwarded-Encrypted: i=1; AJvYcCWIoAyOT3KXAvuRuE1c+FaCWmlam/rcHxsKv95sm5s107KwKWR74agzdatGLWR/P7ss9e+IKGEc9Ptsu7838dKMqa5CiIbblketJNIKODj9 X-Gm-Message-State: AOJu0YzhPfREYU10C6qqkuB6HJMJGNQi9lZfpXr4xwTHjp+eXLvv5a34 +SVUZ29NLBqaNnPRWoxqJGLjaLncb5Brw2aJ+T6aAw/3Zsq8X62UeC19+VuGzaiZIZ9ezHSDgKC P04eyZo+RB5mUWL/0T1Gz1Q== X-Google-Smtp-Source: AGHT+IFAQfttRh2pNYlXWLt+EOdXQRceatfuqBvwy9vDrsaE8gKW4y3sNLbrewXKEgB8QVJyf+/9FjZgyaYm4vdq1Q== X-Received: from almasrymina.svl.corp.google.com ([2620:15c:2c4:200:c51e:bdd0:7cc8:695c]) (user=almasrymina job=sendgmr) by 2002:a05:6902:1021:b0:dc7:49a9:6666 with SMTP id x1-20020a056902102100b00dc749a96666mr3625631ybt.3.1711493459258; Tue, 26 Mar 2024 15:50:59 -0700 (PDT) Date: Tue, 26 Mar 2024 15:50:33 -0700 In-Reply-To: <20240326225048.785801-1-almasrymina@google.com> Mime-Version: 1.0 References: <20240326225048.785801-1-almasrymina@google.com> X-Mailer: git-send-email 2.44.0.396.g6e790dbe36-goog Message-ID: <20240326225048.785801-3-almasrymina@google.com> Subject: [RFC PATCH net-next v7 02/14] 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 , Steffen Klassert , Herbert Xu , 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 dd364d738c00..795b7ff1c01f 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). @@ -889,6 +916,12 @@ 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); }