From patchwork Fri Dec 8 00:52:38 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mina Almasry X-Patchwork-Id: 13484555 X-Patchwork-Delegate: kuba@kernel.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="q95z+wyk" Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 702F21989 for ; Thu, 7 Dec 2023 16:53:10 -0800 (PST) Received: by mail-yb1-xb4a.google.com with SMTP id 3f1490d57ef6-db54c11887aso1918747276.1 for ; Thu, 07 Dec 2023 16:53:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1701996789; x=1702601589; 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=SdsQlA52rmqBL7OXbh7npWQi67Syf8S/UwksNo2UDhs=; b=q95z+wyk4H31xzCDd2pjmnTHHhFDhyJRKmdJ59urvQwlbJlWHRMLKw1kdiGNp8Dplp pdgZF2KZZf1mSoDEH9v+iSK7zkalHdgB7c8SDCI3LvY3RZP6jzvSnmteLY4DXOXGU4h+ uMyyFz1mwB8H05lV/zqEauumoXhvaEWLEkVmsdICX7e2oHFSHySbsvXO3Z3pNjD5Uww3 mYpRE2V/fkzJ/hnfYi2oWBnnPHNIfkGa8HxPhaJGbvFYZO5L8Dfc8O75E6yc+6yqwdH7 iHGapPKuvH2M8YrXT9T/WA9TGGkxNvM7UFnIEwLgeEV1Ir4o1bpsh+nKq9geSemdJ/rz UR3Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1701996789; x=1702601589; 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=SdsQlA52rmqBL7OXbh7npWQi67Syf8S/UwksNo2UDhs=; b=r1alFexzVaOrre20j3MDCYBK1IUTGqNH9dGvskZ/y6LkKeZLGo+/YyA1LPWDRE2gRm DClkxyNWcVond6fQ+RZQkkR4A0Lhrb0+T2CmoePpzVKCKYkr8NLMmp4WcwD5KezRYUyi WXvo6HJkPVmkcrhRn437mldSdlORu+jNDtY2Pgl8qlwlXfYO/93CBRziZB6ORDklg/Va DDlmdsaMrXbTBkWGQmGQwHCxiguNKZtK3Li1d8ZLKeU/5KAUL04GuFv9hSPxn7+QGUFg UNaLilKPBLaMXxFHZ3iNLyoRcM7+rdl+VX/pj0kBf7fcC2m5cq3/9vA2QYDMTvifXWq3 kTdA== X-Gm-Message-State: AOJu0YyoJAV42ouEu4ciBufp+XkguePCo3ECil63nJpl37fCwN9UxMOe 6xQ6fxvn+WpNqWHDiEiGiyFTHLXprtmuja0+AQ== X-Google-Smtp-Source: AGHT+IH/gfYr5EUfMzd/NX+8vXC/GoT0BalxzSTTls31g4lmQqKZy/8eIFEENuQk1BoM56tiXZ2me83KTuMQvZ3iJQ== X-Received: from almasrymina.svl.corp.google.com ([2620:15c:2c4:200:f1cf:c733:235b:9fff]) (user=almasrymina job=sendgmr) by 2002:a25:7690:0:b0:db4:6936:48b7 with SMTP id r138-20020a257690000000b00db4693648b7mr52142ybc.2.1701996789635; Thu, 07 Dec 2023 16:53:09 -0800 (PST) Date: Thu, 7 Dec 2023 16:52:38 -0800 In-Reply-To: <20231208005250.2910004-1-almasrymina@google.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20231208005250.2910004-1-almasrymina@google.com> X-Mailer: git-send-email 2.43.0.472.g3155946c3a-goog Message-ID: <20231208005250.2910004-8-almasrymina@google.com> Subject: [net-next v1 07/16] netdev: netdevice devmem allocator From: Mina Almasry To: Shailend Chand , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-arch@vger.kernel.org, linux-kselftest@vger.kernel.org, bpf@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 , Jeroen de Borst , Praveen Kaligineedi , Jesper Dangaard Brouer , Ilias Apalodimas , Arnd Bergmann , David Ahern , Willem de Bruijn , Shuah Khan , Sumit Semwal , " =?utf-8?q?Christian_K=C3=B6nig?= " , Yunsheng Lin , Harshitha Ramamurthy , Shakeel Butt , Willem de Bruijn , Kaiyuan Zhang X-Patchwork-Delegate: kuba@kernel.org Implement netdev devmem allocator. The allocator takes a given struct netdev_dmabuf_binding as input and allocates page_pool_iov from that binding. The allocation simply delegates to the binding's genpool for the allocation logic and wraps the returned memory region in a page_pool_iov struct. page_pool_iov are refcounted and are freed back to the binding when the refcount drops to 0. Signed-off-by: Willem de Bruijn Signed-off-by: Kaiyuan Zhang Signed-off-by: Mina Almasry --- v1: - Rename devmem -> dmabuf (David). --- include/net/devmem.h | 13 ++++++++++++ include/net/page_pool/helpers.h | 28 +++++++++++++++++++++++++ net/core/dev.c | 37 ++++++++++++++++++++++++++++++++- 3 files changed, 77 insertions(+), 1 deletion(-) diff --git a/include/net/devmem.h b/include/net/devmem.h index 29ff125f9815..29bc337c7743 100644 --- a/include/net/devmem.h +++ b/include/net/devmem.h @@ -48,6 +48,9 @@ struct netdev_dmabuf_binding { }; #ifdef CONFIG_DMA_SHARED_BUFFER +struct page_pool_iov * +netdev_alloc_dmabuf(struct netdev_dmabuf_binding *binding); +void netdev_free_dmabuf(struct page_pool_iov *ppiov); void __netdev_dmabuf_binding_free(struct netdev_dmabuf_binding *binding); int netdev_bind_dmabuf(struct net_device *dev, unsigned int dmabuf_fd, struct netdev_dmabuf_binding **out); @@ -55,6 +58,16 @@ void netdev_unbind_dmabuf(struct netdev_dmabuf_binding *binding); int netdev_bind_dmabuf_to_queue(struct net_device *dev, u32 rxq_idx, struct netdev_dmabuf_binding *binding); #else +static inline struct page_pool_iov * +netdev_alloc_dmabuf(struct netdev_dmabuf_binding *binding) +{ + return NULL; +} + +static inline void netdev_free_dmabuf(struct page_pool_iov *ppiov) +{ +} + static inline void __netdev_dmabuf_binding_free(struct netdev_dmabuf_binding *binding) { diff --git a/include/net/page_pool/helpers.h b/include/net/page_pool/helpers.h index 7dc65774cde5..8bfc2d43efd4 100644 --- a/include/net/page_pool/helpers.h +++ b/include/net/page_pool/helpers.h @@ -79,6 +79,34 @@ static inline u64 *page_pool_ethtool_stats_get(u64 *data, void *stats) } #endif +/* page_pool_iov support */ + +static inline struct dmabuf_genpool_chunk_owner * +page_pool_iov_owner(const struct page_pool_iov *ppiov) +{ + return ppiov->owner; +} + +static inline unsigned int page_pool_iov_idx(const struct page_pool_iov *ppiov) +{ + return ppiov - page_pool_iov_owner(ppiov)->ppiovs; +} + +static inline dma_addr_t +page_pool_iov_dma_addr(const struct page_pool_iov *ppiov) +{ + struct dmabuf_genpool_chunk_owner *owner = page_pool_iov_owner(ppiov); + + return owner->base_dma_addr + + ((dma_addr_t)page_pool_iov_idx(ppiov) << PAGE_SHIFT); +} + +static inline struct netdev_dmabuf_binding * +page_pool_iov_binding(const struct page_pool_iov *ppiov) +{ + return page_pool_iov_owner(ppiov)->binding; +} + /** * page_pool_dev_alloc_pages() - allocate a page. * @pool: pool from which to allocate diff --git a/net/core/dev.c b/net/core/dev.c index b8c8be5a912e..30667e4c3b95 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -155,8 +155,8 @@ #include #include #include -#include #include +#include #include "dev.h" #include "net-sysfs.h" @@ -2120,6 +2120,41 @@ static int netdev_restart_rx_queue(struct net_device *dev, int rxq_idx) return err; } +struct page_pool_iov *netdev_alloc_dmabuf(struct netdev_dmabuf_binding *binding) +{ + struct dmabuf_genpool_chunk_owner *owner; + struct page_pool_iov *ppiov; + unsigned long dma_addr; + ssize_t offset; + ssize_t index; + + dma_addr = gen_pool_alloc_owner(binding->chunk_pool, PAGE_SIZE, + (void **)&owner); + if (!dma_addr) + return NULL; + + offset = dma_addr - owner->base_dma_addr; + index = offset / PAGE_SIZE; + ppiov = &owner->ppiovs[index]; + + netdev_dmabuf_binding_get(binding); + + return ppiov; +} + +void netdev_free_dmabuf(struct page_pool_iov *ppiov) +{ + struct netdev_dmabuf_binding *binding = page_pool_iov_binding(ppiov); + unsigned long dma_addr = page_pool_iov_dma_addr(ppiov); + + refcount_set(&ppiov->refcount, 1); + + if (gen_pool_has_addr(binding->chunk_pool, dma_addr, PAGE_SIZE)) + gen_pool_free(binding->chunk_pool, dma_addr, PAGE_SIZE); + + netdev_dmabuf_binding_put(binding); +} + /* Protected by rtnl_lock() */ static DEFINE_XARRAY_FLAGS(netdev_dmabuf_bindings, XA_FLAGS_ALLOC1);