From patchwork Fri Jun 7 00:51:14 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mina Almasry X-Patchwork-Id: 13689149 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 EC63DC27C5E for ; Fri, 7 Jun 2024 00:51:45 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 8AE9910EB43; Fri, 7 Jun 2024 00:51:41 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.b="y987jBq4"; dkim-atps=neutral Received: from mail-yb1-f201.google.com (mail-yb1-f201.google.com [209.85.219.201]) by gabe.freedesktop.org (Postfix) with ESMTPS id 6C38F10EB3B for ; Fri, 7 Jun 2024 00:51:40 +0000 (UTC) Received: by mail-yb1-f201.google.com with SMTP id 3f1490d57ef6-df4d62ff39fso2750404276.2 for ; Thu, 06 Jun 2024 17:51:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1717721499; x=1718326299; 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=Sw3eENSKZOREyTuRzprxy+gOxF7vJnH6YZ6ILVdRvdg=; b=y987jBq4bt4MTrWS4ZC6xo5W4R0ozFSkxWx81n+5ioEdu6q8Lb6SX2CNcehpn/irLu 1FV7hSQVPNVGff5ViPleOQg1a0jZHnMDvpdlmKoWovw2VBe/JNWBXUq1txF/XOYO2Cis ordjFpPp1FIe88l63gXMcWhV4xfW8wNBD3eOHbP6+Fj6cDG3ne1G/GFJ0HzLTrgTHVaW JLvLALoe/xp1v9dmkhF3h5tnG5SyjOt7oaETV7+NBwsbcv/ktSgkX4hJDgthOzP9EafC VkZ1Yj0y0On+K/hUFZuPkPIYQzRA8Sa3lWkDulyoowq0lEeXEQ34hMPSU/DfzhGHVU+R WSxg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1717721499; x=1718326299; 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=Sw3eENSKZOREyTuRzprxy+gOxF7vJnH6YZ6ILVdRvdg=; b=YcnfeT3m77zp9JblIlhCPk1h6z3acgLGvpKBeG0UHbNAjvtrn/DwbVzL+nziltjp0O KrvRNGqGM2rVx4FVZUeImJl4JZJq9o65If8ibmRzJNElx66oPzzQmh2MM2XhRupxGm7E /8H02bwM9UQFKUN5y9fMnJEonoqSMQzlRXAJMA0278O84++bdPTo12nUzuBU0Tip1deQ ZIH77vGTmhmNR6/CL1cogpOZwlv8/S2urmItUSXX5M4IMu1gL2p8Bz3qdLyB0Hmf6WNQ 082C0cnJ/Ib+bMHHX1gr/Efxx5Lz/CK8Ug9bbr6ddfr5zcssqN5hA1p0QBnwraVC8UiY kdWA== X-Forwarded-Encrypted: i=1; AJvYcCViBaJjiAvQ2GsxtWAvkoi11TD3j4HX/BjWxo+dawWtFnq8+t2hv1oS1IitMX811FFv1qZ/o8KJ/IlDrhdTNh5GpOyrBpsHPtLODt/TuD2a X-Gm-Message-State: AOJu0Yys+i8deEZsCatKGqMl8GOfFG6/qfyHvAt0dnJijzf5/5Mn1RrQ 5T/qm9BWqTDmLgxhyRIWXHWvjUXntWePRtUpjw2l8Seoa9Mx3kWkAtPlrvpG0N09XUNYVKdeLsZ zQLW4hUXf31HHfffzEL1/6A== X-Google-Smtp-Source: AGHT+IEazNJIZBQ50ocVOjhQPgwUQswhBjaLJAiCaJs3j6ybn0wNCcPnLF8Jm4fihz8jJR+KVFdPdpFA0cvd2xOTfA== X-Received: from almasrymina.c.googlers.com ([fda3:e722:ac3:cc00:20:ed76:c0a8:4bc5]) (user=almasrymina job=sendgmr) by 2002:a05:6902:1024:b0:dfa:56fa:bb4e with SMTP id 3f1490d57ef6-dfaf64ea21fmr294425276.1.1717721499361; Thu, 06 Jun 2024 17:51:39 -0700 (PDT) Date: Fri, 7 Jun 2024 00:51:14 +0000 In-Reply-To: <20240607005127.3078656-1-almasrymina@google.com> Mime-Version: 1.0 References: <20240607005127.3078656-1-almasrymina@google.com> X-Mailer: git-send-email 2.45.2.505.gda0bf45e8d-goog Message-ID: <20240607005127.3078656-5-almasrymina@google.com> Subject: [PATCH net-next v11 04/13] netdev: netdevice devmem allocator 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?= " , Bagas Sanjaya , Christoph Hellwig , Nikolay Aleksandrov , 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 netdev devmem allocator. The allocator takes a given struct netdev_dmabuf_binding as input and allocates net_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 net_iov struct. Signed-off-by: Willem de Bruijn Signed-off-by: Kaiyuan Zhang Signed-off-by: Mina Almasry --- v11: - Fix extraneous inline directive (Paolo) v8: - Rename netdev_dmabuf_binding -> net_devmem_dmabuf_binding to avoid patch-by-patch build error. - Move niov->pp_magic/pp/pp_ref_counter usage to later patch to avoid patch-by-patch build error. v7: - netdev_ -> net_devmem_* naming (Yunsheng). v6: - Add comment on net_iov_dma_addr to explain why we don't use niov->dma_addr (Pavel) - Refactor new functions into net/core/devmem.c (Pavel) v1: - Rename devmem -> dmabuf (David). --- include/net/devmem.h | 13 +++++++++++++ include/net/netmem.h | 18 ++++++++++++++++++ net/core/devmem.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 75 insertions(+) diff --git a/include/net/devmem.h b/include/net/devmem.h index eaf3fd965d7a8..b65795a8f8f13 100644 --- a/include/net/devmem.h +++ b/include/net/devmem.h @@ -68,7 +68,20 @@ int net_devmem_bind_dmabuf(struct net_device *dev, unsigned int dmabuf_fd, void net_devmem_unbind_dmabuf(struct net_devmem_dmabuf_binding *binding); int net_devmem_bind_dmabuf_to_queue(struct net_device *dev, u32 rxq_idx, struct net_devmem_dmabuf_binding *binding); +struct net_iov * +net_devmem_alloc_dmabuf(struct net_devmem_dmabuf_binding *binding); +void net_devmem_free_dmabuf(struct net_iov *ppiov); #else +static inline struct net_iov * +net_devmem_alloc_dmabuf(struct net_devmem_dmabuf_binding *binding) +{ + return NULL; +} + +static inline void net_devmem_free_dmabuf(struct net_iov *ppiov) +{ +} + static inline void __net_devmem_dmabuf_binding_free(struct net_devmem_dmabuf_binding *binding) { diff --git a/include/net/netmem.h b/include/net/netmem.h index 72e932a1a9489..01dbdd216fae7 100644 --- a/include/net/netmem.h +++ b/include/net/netmem.h @@ -14,8 +14,26 @@ struct net_iov { struct dmabuf_genpool_chunk_owner *owner; + unsigned long dma_addr; }; +static inline struct dmabuf_genpool_chunk_owner * +net_iov_owner(const struct net_iov *niov) +{ + return niov->owner; +} + +static inline unsigned int net_iov_idx(const struct net_iov *niov) +{ + return niov - net_iov_owner(niov)->niovs; +} + +static inline struct net_devmem_dmabuf_binding * +net_iov_binding(const struct net_iov *niov) +{ + return net_iov_owner(niov)->binding; +} + /* netmem */ /** diff --git a/net/core/devmem.c b/net/core/devmem.c index 951a06004c430..b53ea67c020d3 100644 --- a/net/core/devmem.c +++ b/net/core/devmem.c @@ -32,6 +32,14 @@ static void net_devmem_dmabuf_free_chunk_owner(struct gen_pool *genpool, kfree(owner); } +static dma_addr_t net_devmem_get_dma_addr(const struct net_iov *niov) +{ + struct dmabuf_genpool_chunk_owner *owner = net_iov_owner(niov); + + return owner->base_dma_addr + + ((dma_addr_t)net_iov_idx(niov) << PAGE_SHIFT); +} + void __net_devmem_dmabuf_binding_free(struct net_devmem_dmabuf_binding *binding) { size_t size, avail; @@ -54,6 +62,42 @@ void __net_devmem_dmabuf_binding_free(struct net_devmem_dmabuf_binding *binding) kfree(binding); } +struct net_iov * +net_devmem_alloc_dmabuf(struct net_devmem_dmabuf_binding *binding) +{ + struct dmabuf_genpool_chunk_owner *owner; + unsigned long dma_addr; + struct net_iov *niov; + 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; + niov = &owner->niovs[index]; + + niov->dma_addr = 0; + + net_devmem_dmabuf_binding_get(binding); + + return niov; +} + +void net_devmem_free_dmabuf(struct net_iov *niov) +{ + struct net_devmem_dmabuf_binding *binding = net_iov_binding(niov); + unsigned long dma_addr = net_devmem_get_dma_addr(niov); + + if (gen_pool_has_addr(binding->chunk_pool, dma_addr, PAGE_SIZE)) + gen_pool_free(binding->chunk_pool, dma_addr, PAGE_SIZE); + + net_devmem_dmabuf_binding_put(binding); +} + /* Protected by rtnl_lock() */ static DEFINE_XARRAY_FLAGS(net_devmem_dmabuf_bindings, XA_FLAGS_ALLOC1);