From patchwork Fri May 10 23:21:19 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mina Almasry X-Patchwork-Id: 13662055 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 BEAC1C25B5F for ; Fri, 10 May 2024 23:21:54 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 1E6E910E3F4; Fri, 10 May 2024 23:21:52 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.b="lVJ5G2A9"; dkim-atps=neutral Received: from mail-yb1-f202.google.com (mail-yb1-f202.google.com [209.85.219.202]) by gabe.freedesktop.org (Postfix) with ESMTPS id 5BBEF10E419 for ; Fri, 10 May 2024 23:21:50 +0000 (UTC) Received: by mail-yb1-f202.google.com with SMTP id 3f1490d57ef6-de54ccab44aso4705287276.3 for ; Fri, 10 May 2024 16:21:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1715383309; x=1715988109; 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=1L8tb5BTJl8qzNtpL8xP8PFOwKpTMNCekyzgPHzbhj8=; b=lVJ5G2A9Sn1dLbh/SA8LXZD32llNkhBce8uUwPuTtgKGNXFKvKmzF9/F/+/cYvRh6k vkVjI2/Vdk+Usl1KfECmdg0nP8AU2hByhQwk30RzSBCrHuHdluXEarxbi1m3bfFfGrrf eU//KcHB+11CwkfxJqx/iHtDhX12OLOvfzKZFJc41+XPudwH5QSQXPI5CNxHDWLZLJ1H DrbDZTG9Uej4L+S9LvOw0lrzCsLJSKrfEV7bHvYvj01BxIpzGMOWnchTot9B7xFDmfRP 2F1TOJ5NsW31Dwh9NI9cc9u4Ryk/mhwqUObWwbklZtZqZ2lGFrT0U93OwxqenUBTgqj6 DDBw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1715383309; x=1715988109; 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=1L8tb5BTJl8qzNtpL8xP8PFOwKpTMNCekyzgPHzbhj8=; b=Gq562ATF84tDgp6GvTlmJCps09yUTEWOx3xW9sqIKyjeazMOWBP9QMk/W3ys860RRn KM0ko0jolvI+XhzN5xADAv2aePSh3cZn4v4GcXIl4ANjHmpOt1QshHpbKqK8M6Ohk9Uc Ko1AHqDZrM3d/4UHp3CGPlqPK02HMRXimjSgODxYQI20uwH52bVixPFQnNzTSK5RHLFY JLpTWaWZbnEMoVwGoyb4hu+roUf3wjJjlc+CJD6JCty4B3uhk3cAeQ/z6Nqn9WlkpitV OZQn7NZ8IKIexlC0oW+y10fvs47NPkqbV1HkAgyvuwBNFnPqBgGfENO4wGiTOurv1K2y F4UQ== X-Forwarded-Encrypted: i=1; AJvYcCVdJVqfYaCFIKRmnTLmUlkRhzTKWTDntMOsujKFeBnbghspQNCl7lWHsIIidGfrnXfe1Ea9sYcqvSLZTQkf4ZX0f5VZIhw7wMge4VMrtRik X-Gm-Message-State: AOJu0YzcV/l0iwpSdjX8IyuNGefRIwy76POLtzj7wxDuFUBpQFb6+eLP V2jxrGoU0W5gCeWR2Z80dfsSq+ePZgjZab9QKOnekhUEmGSfoR8XU4grqAoPcZ76X/zakFzImrt TZE7okBl2BWB/zLkM6Jobyg== X-Google-Smtp-Source: AGHT+IFY5LsEzMZ5fgcYZDP3XqXP3H3pPyOHLOkRLqtKf21DQjhm0Hv6E7Ow9p23JPKnxpRgymNOb6mqJEhel2ELEg== X-Received: from almasrymina.svl.corp.google.com ([2620:15c:2c4:200:3428:1b4e:e75a:d31b]) (user=almasrymina job=sendgmr) by 2002:a05:6902:1245:b0:de4:c54c:6754 with SMTP id 3f1490d57ef6-dee4f175081mr1010810276.3.1715383309223; Fri, 10 May 2024 16:21:49 -0700 (PDT) Date: Fri, 10 May 2024 16:21:19 -0700 In-Reply-To: <20240510232128.1105145-1-almasrymina@google.com> Mime-Version: 1.0 References: <20240510232128.1105145-1-almasrymina@google.com> X-Mailer: git-send-email 2.45.0.118.g7fe29c98d7-goog Message-ID: <20240510232128.1105145-9-almasrymina@google.com> Subject: [PATCH net-next v9 08/14] memory-provider: dmabuf devmem memory provider 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?= " , Pavel Begunkov , David Wei , Jason Gunthorpe , Yunsheng Lin , Shailend Chand , Harshitha Ramamurthy , Shakeel Butt , Jeroen de Borst , Praveen Kaligineedi , Willem de Bruijn , Kaiyuan Zhang 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" Implement a memory provider that allocates dmabuf devmem in the form of net_iov. The provider receives a reference to the struct netdev_dmabuf_binding via the pool->mp_priv pointer. The driver needs to set this pointer for the provider in the net_iov. The provider obtains a reference on the netdev_dmabuf_binding which guarantees the binding and the underlying mapping remains alive until the provider is destroyed. Usage of PP_FLAG_DMA_MAP is required for this memory provide such that the page_pool can provide the driver with the dma-addrs of the devmem. Support for PP_FLAG_DMA_SYNC_DEV is omitted for simplicity & p.order != 0. Signed-off-by: Willem de Bruijn Signed-off-by: Kaiyuan Zhang Signed-off-by: Mina Almasry --- v8: - Use skb_frag_size instead of frag->bv_len to fix patch-by-patch build error v6: - refactor new memory provider functions into net/core/devmem.c (Pavel) v2: - Disable devmem for p.order != 0 v1: - static_branch check in page_is_page_pool_iov() (Willem & Paolo). - PP_DEVMEM -> PP_IOV (David). - Require PP_FLAG_DMA_MAP (Jakub). --- include/net/netmem.h | 15 ++++++ include/net/page_pool/helpers.h | 22 +++++++++ include/net/page_pool/types.h | 2 + net/core/devmem.c | 83 +++++++++++++++++++++++++++++++++ net/core/page_pool.c | 38 +++++++-------- 5 files changed, 138 insertions(+), 22 deletions(-) diff --git a/include/net/netmem.h b/include/net/netmem.h index 4534dee7ec39c..a4a87a46bb216 100644 --- a/include/net/netmem.h +++ b/include/net/netmem.h @@ -122,6 +122,21 @@ static inline struct page *netmem_to_page(netmem_ref netmem) return (__force struct page *)netmem; } +static inline struct net_iov *netmem_to_net_iov(netmem_ref netmem) +{ + if (netmem_is_net_iov(netmem)) + return (struct net_iov *)((__force unsigned long)netmem & + ~NET_IOV); + + DEBUG_NET_WARN_ON_ONCE(true); + return NULL; +} + +static inline netmem_ref net_iov_to_netmem(struct net_iov *niov) +{ + return (__force netmem_ref)((unsigned long)niov | NET_IOV); +} + static inline netmem_ref page_to_netmem(struct page *page) { return (__force netmem_ref)page; diff --git a/include/net/page_pool/helpers.h b/include/net/page_pool/helpers.h index f6f126914c6ee..16cca34b0e297 100644 --- a/include/net/page_pool/helpers.h +++ b/include/net/page_pool/helpers.h @@ -477,4 +477,26 @@ static inline void page_pool_nid_changed(struct page_pool *pool, int new_nid) page_pool_update_nid(pool, new_nid); } +static inline void page_pool_set_pp_info(struct page_pool *pool, + netmem_ref netmem) +{ + 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 + * is allocated from the page allocator and page_pool_fragment_page() + * is dirtying the same cache line as the page->pp_magic above, so + * the overhead is negligible. + */ + page_pool_fragment_netmem(netmem, 1); + if (pool->has_init_callback) + pool->slow.init_callback(netmem, pool->slow.init_arg); +} + +static inline void page_pool_clear_pp_info(netmem_ref netmem) +{ + netmem_clear_pp_magic(netmem); + netmem_set_pp(netmem, NULL); +} #endif /* _NET_PAGE_POOL_HELPERS_H */ diff --git a/include/net/page_pool/types.h b/include/net/page_pool/types.h index c51e45b343f10..7813d0f71f5f6 100644 --- a/include/net/page_pool/types.h +++ b/include/net/page_pool/types.h @@ -141,6 +141,8 @@ struct pp_memory_provider_params { void *mp_priv; }; +extern const struct memory_provider_ops dmabuf_devmem_ops; + struct page_pool { struct page_pool_params_fast p; diff --git a/net/core/devmem.c b/net/core/devmem.c index c455f1825daad..3da5630862290 100644 --- a/net/core/devmem.c +++ b/net/core/devmem.c @@ -155,6 +155,7 @@ int net_devmem_bind_dmabuf_to_queue(struct net_device *dev, u32 rxq_idx, * the driver may read this config while it's creating its * rx-queues. * WRITE_ONCE() here to match the READ_ONCE() in the driver. */ + WRITE_ONCE(rxq->mp_params.mp_ops, &dmabuf_devmem_ops); WRITE_ONCE(rxq->mp_params.mp_priv, binding); err = netdev_rx_queue_restart(dev, rxq_idx); @@ -291,3 +292,85 @@ int net_devmem_bind_dmabuf(struct net_device *dev, unsigned int dmabuf_fd, return err; } #endif + +/*** "Dmabuf devmem memory provider" ***/ + +static int mp_dmabuf_devmem_init(struct page_pool *pool) +{ + struct net_devmem_dmabuf_binding *binding = pool->mp_priv; + + if (!binding) + return -EINVAL; + + if (!(pool->p.flags & PP_FLAG_DMA_MAP)) + return -EOPNOTSUPP; + + if (pool->p.flags & PP_FLAG_DMA_SYNC_DEV) + return -EOPNOTSUPP; + + if (pool->p.order != 0) + return -E2BIG; + + net_devmem_dmabuf_binding_get(binding); + return 0; +} + +static netmem_ref mp_dmabuf_devmem_alloc_pages(struct page_pool *pool, + gfp_t gfp) +{ + struct net_devmem_dmabuf_binding *binding = pool->mp_priv; + netmem_ref netmem; + struct net_iov *niov; + dma_addr_t dma_addr; + + niov = net_devmem_alloc_dmabuf(binding); + if (!niov) + return 0; + + dma_addr = net_iov_dma_addr(niov); + + netmem = net_iov_to_netmem(niov); + + page_pool_set_pp_info(pool, netmem); + + if (page_pool_set_dma_addr_netmem(netmem, dma_addr)) + goto err_free; + + pool->pages_state_hold_cnt++; + trace_page_pool_state_hold(pool, netmem, pool->pages_state_hold_cnt); + return netmem; + +err_free: + net_devmem_free_dmabuf(niov); + return 0; +} + +static void mp_dmabuf_devmem_destroy(struct page_pool *pool) +{ + struct net_devmem_dmabuf_binding *binding = pool->mp_priv; + + net_devmem_dmabuf_binding_put(binding); +} + +static bool mp_dmabuf_devmem_release_page(struct page_pool *pool, + netmem_ref netmem) +{ + WARN_ON_ONCE(!netmem_is_net_iov(netmem)); + WARN_ON_ONCE(atomic_long_read(netmem_get_pp_ref_count_ref(netmem)) != + 1); + + page_pool_clear_pp_info(netmem); + + net_devmem_free_dmabuf(netmem_to_net_iov(netmem)); + + /* We don't want the page pool put_page()ing our net_iovs. */ + return false; +} + +const struct memory_provider_ops dmabuf_devmem_ops = { + .init = mp_dmabuf_devmem_init, + .destroy = mp_dmabuf_devmem_destroy, + .alloc_pages = mp_dmabuf_devmem_alloc_pages, + .release_page = mp_dmabuf_devmem_release_page, +}; +EXPORT_SYMBOL(dmabuf_devmem_ops); diff --git a/net/core/page_pool.c b/net/core/page_pool.c index 37994b58490d8..3fa30f7ca76a2 100644 --- a/net/core/page_pool.c +++ b/net/core/page_pool.c @@ -13,6 +13,7 @@ #include #include +#include #include #include @@ -21,12 +22,15 @@ #include #include #include +#include +#include #include #include "page_pool_priv.h" DEFINE_STATIC_KEY_FALSE(page_pool_mem_providers); +EXPORT_SYMBOL(page_pool_mem_providers); #define DEFER_TIME (msecs_to_jiffies(1000)) #define DEFER_WARN_INTERVAL (60 * HZ) @@ -179,7 +183,9 @@ static int page_pool_init(struct page_pool *pool, const struct page_pool_params *params, int cpuid) { + const struct memory_provider_ops *mp_ops = NULL; unsigned int ring_qsize = 1024; /* Default */ + void *mp_priv = NULL; int err; memcpy(&pool->p, ¶ms->fast, sizeof(pool->p)); @@ -252,6 +258,16 @@ 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->p.queue) { + mp_ops = READ_ONCE(pool->p.queue->mp_params.mp_ops); + mp_priv = READ_ONCE(pool->p.queue->mp_params.mp_priv); + } + + if (mp_ops && mp_priv) { + pool->mp_ops = mp_ops; + pool->mp_priv = mp_priv; + } + if (pool->mp_ops) { err = pool->mp_ops->init(pool); if (err) { @@ -445,28 +461,6 @@ static bool page_pool_dma_map(struct page_pool *pool, netmem_ref netmem) return false; } -static void page_pool_set_pp_info(struct page_pool *pool, netmem_ref netmem) -{ - 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 - * is allocated from the page allocator and page_pool_fragment_page() - * is dirtying the same cache line as the page->pp_magic above, so - * the overhead is negligible. - */ - page_pool_fragment_netmem(netmem, 1); - if (pool->has_init_callback) - pool->slow.init_callback(netmem, pool->slow.init_arg); -} - -static void page_pool_clear_pp_info(netmem_ref netmem) -{ - netmem_clear_pp_magic(netmem); - netmem_set_pp(netmem, NULL); -} - static struct page *__page_pool_alloc_page_order(struct page_pool *pool, gfp_t gfp) {