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: 13661993 Received: from mail-yb1-f201.google.com (mail-yb1-f201.google.com [209.85.219.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E7BE917F38B for ; Fri, 10 May 2024 23:21:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715383317; cv=none; b=KVlf9gAFjnRJdfAuEyiRa/2hGe5SqFwMEoyLyrT6mp+1muk4BO6Zey2vUUZLksQCxL9gsrhV28ZbuAHwsZYLWl3q6Vm9bAqiE+YqrSIGiLyuiRPKeb1bC/bAJYIaKCAgIDkxHtiwrFRsO5m6YsVTkYrZ+0CWyRSJZWbAyDdkVRc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715383317; c=relaxed/simple; bh=2d0/Ec8J5oxlK7jwkzSGlvzCADCXupMSdZexrE0CbsY=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=hSQj8zDJmdR1G6f4PUyVbeVquWm/U8QL+xAndp4XWoyiQFvi0oEmkIwWdTYRdN0x27l+OvUdwvgY7yamJe6aFOXC7Q2OQNA7lFm5rV8sOcVNM3ZAcL+ndSgyBBoUR3Bw6RE1zGUC/BNpnlTK7e4FBLodgep6xzdsbph635TqNsc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--almasrymina.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=c/A0RSh3; arc=none smtp.client-ip=209.85.219.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--almasrymina.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="c/A0RSh3" Received: by mail-yb1-f201.google.com with SMTP id 3f1490d57ef6-dee5f035dd6so1163907276.0 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=vger.kernel.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=c/A0RSh3+9rwIRI+YSQO8IIQDqU5ioaAIe4nrjg6919cF32TpIdYhcLK+Y5g3Nn+1E Y2M/CsbuSuOsHAZbpfSNmVLGgXSneaRUZ09OkodOOP7q7St+ovLMg75RJbx+VmUEkUoP 1gXsqHE8ZxCGuygarAxWe7KPsQI/j7E/ZSa+MCKu7xO0w4LW3BzVJbOmAGeC4prAMXGz 172wT0rJ0N750EU99SP7kxOm4EL+oV8WV00VjHevPw1xE2l2fen5Eahu6PjVFsWjRrQ4 ayTTK5pn8LPc3OJ9qlKCt3e7slz8/d+DiTMJ6rNcZIHzn5gJgNgA1anxDagWJ4vo7hOl IHHg== 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=Jz0k1UFVT2Acdu78HbJlSGTkj3QCwczvb5y7IWF2BLHR6oYHjUSMCWbcNBSrmxjU2Y wU2u4HOF/IW9zGPec/ChXPGMFmmTgTdkdE2koY+63xnWQ6iZ2TyCkfXn9bCZbNLxzyak /AUQyNKSRE6lh+yfh3bcyFiv5Ee2TwI7XBdOEv0Ni0eW/Ua/lZkRjDwI7D/nOufIyVLZ T5uNGLd3KOkGBvBBft0Zq6yDMfcf1ObDu8F2VVkdLgByQUEeg2DqrPuPvFXkV3OVVtu1 rsUFV967Aj67Gvk6Y+neQmClBRPH5Y7Tn4w4h0DmNWoAsbFKWP4LryKXBaJqhpjcsABZ q41Q== X-Forwarded-Encrypted: i=1; AJvYcCVYA/k3aOzY32TTinNFYN9XLCNVXJDp1t5HYKgtyhm9Q2rFbacAJy9o/h97TGyfWJcTNUVyayS6fA90Z5it+iewKv8EzDb9cbR9v0VuezmS X-Gm-Message-State: AOJu0YxHYOFlLqY/h8Y8H1FVTmirzHEicKPbDwSkwxVbnTag2qXL61pa pJ1UmHafNoCgA0RYhyeaPQ96y778AOLGorWZ8xvYzTMK/kbTPa7T6CjZCpKCZmebgkopXspDVLF E+aNHkOFLEGL5i1J0vxmfzA== 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> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 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) {