From patchwork Fri May 10 23:21:16 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mina Almasry X-Patchwork-Id: 13662051 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 57661C25B75 for ; Fri, 10 May 2024 23:21:49 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 09DEF10E31F; Fri, 10 May 2024 23:21:46 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.b="XQfkapba"; 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 93A5A10E31F for ; Fri, 10 May 2024 23:21:44 +0000 (UTC) Received: by mail-yb1-f201.google.com with SMTP id 3f1490d57ef6-de60cd96bf3so5472251276.0 for ; Fri, 10 May 2024 16:21:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1715383303; x=1715988103; 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=cIFstNeC3q4oijsFM3RKN1NWrYB3uLBgK62pDGvDUGc=; b=XQfkapbahdjm+Kqv/8RjwIF4zcI4Su9W0G2WkSwpCZHHXrBfyPkehQ4XoB9l/v3IDt inFjZqFQ60GJbY20Jp/q2rjtHf2Jz6GMBsqIoKdCRNL2QdZGbwSkl3oK5yR9aYUXhQyG YsJIcG9UDtX05TFiqs7wbG5aKch5zOGyYN9tu9Nm3jwSXhhpqwAWN49bZOtPt0RK/uJL uZDfqqbxI0mat1cWn4dtoW6prvhnJxrRtxnb+NwmegimUNIt3BgsWDX1fB7kVqBEyziS sIo5XDxw9uFnJkJr5klWElpVp7KNHGzxPm0oZIwVtHGcMuEozEMIboo4H/oobbRy3Ia+ nkaA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1715383303; x=1715988103; 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=cIFstNeC3q4oijsFM3RKN1NWrYB3uLBgK62pDGvDUGc=; b=AeXXFOys7xjhP73cGvLyWOqNoo6Dtp3MdBmVdB74r6b5hTm+SvSpq36o9IqXKYYpQF VTkC0Dgu8nqo/JhmAI2ehsSn9tXV1JHDGZ+RCu1UfRhd61Kf3W9R4jyu5ol/tiB54oOt psHvo3NX8+3kmG65LE8J1f0w2ZoXaV8IIylfBN6kwbjmLLq2JS2eGZBmXacAts/HjzfL TJd4yjbBIRxIHQEdkilgDtKx96uWTaOjRQ85FNvQm/CjpNMcxO322INeCJiQ8H8XbHmD oSa74cilUB4XRYgxArMz1TyMQey4lNxu600RMKGYsNn3+uAzZJQuhQn4n8BJmBTSQQQJ p6pw== X-Forwarded-Encrypted: i=1; AJvYcCV17q49UQF4xRHPVysUhVhuxWiR5e3EpJljny/Uk+dzXSWazSsNqFzMAFPtxBZwGQsTPCTvqL3PUtEfjRoOR7+pUu7JeeOCkjAwjv0G/dWv X-Gm-Message-State: AOJu0YylKoXVmmSGu8cEPftNLPMRjXh/9SctYlx4KzyOewS3cnMIQ5vm nLQ9vl5W4TeQI6GJo1nseDaDjDZW3aX/pMYhDTIBLpKdXOr5F+xGHlDlfWKL8j4/lX9+3eH+OG8 4LdJnn1gOb6KcxdGZ/cnhtg== X-Google-Smtp-Source: AGHT+IFrc3bI3foVbausGan6NBITnYL6pdSmGDzjUj2i/pl14yjDYPvAtCSQjWtnD/i8zjBBRDIlHe/eew2c9slsjQ== X-Received: from almasrymina.svl.corp.google.com ([2620:15c:2c4:200:3428:1b4e:e75a:d31b]) (user=almasrymina job=sendgmr) by 2002:a05:6902:1004:b0:dbe:d0a9:2be3 with SMTP id 3f1490d57ef6-dee4e558e2dmr1178479276.3.1715383303176; Fri, 10 May 2024 16:21:43 -0700 (PDT) Date: Fri, 10 May 2024 16:21:16 -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: <20240510232128.1105145-6-almasrymina@google.com> Subject: [PATCH net-next v9 05/14] 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?= " , 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 --- 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 | 40 ++++++++++++++++++++++++++++++++++++++++ net/core/devmem.c | 36 ++++++++++++++++++++++++++++++++++++ 3 files changed, 89 insertions(+) diff --git a/include/net/devmem.h b/include/net/devmem.h index fa03bdabdffd9..cd3186f5d1fbd 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..33014370a8858 100644 --- a/include/net/netmem.h +++ b/include/net/netmem.h @@ -14,8 +14,48 @@ 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; +} + +/* This returns the absolute dma_addr_t calculated from + * net_iov_owner(niov)->owner->base_dma_addr, not the page_pool-owned + * niov->dma_addr. + * + * The absolute dma_addr_t is a dma_addr_t that is always uncompressed. + * + * The page_pool-owner niov->dma_addr is the absolute dma_addr compressed into + * an unsigned long. Special handling is done when the unsigned long is 32-bit + * but the dma_addr_t is 64-bit. + * + * In general code looking for the dma_addr_t should use net_iov_dma_addr(), + * while page_pool code looking for the unsigned long dma_addr which mirrors + * the field in struct page should use niov->dma_addr. + */ +static inline dma_addr_t net_iov_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); +} + +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 d82f92d7cf9ce..1f90e23a81441 100644 --- a/net/core/devmem.c +++ b/net/core/devmem.c @@ -54,6 +54,42 @@ 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_iov_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);