From patchwork Tue Aug 13 21:13:06 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mina Almasry X-Patchwork-Id: 13762549 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 9DC96C52D7D for ; Tue, 13 Aug 2024 21:13:33 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 2431F10E37F; Tue, 13 Aug 2024 21:13:33 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.b="cwopVIFR"; 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 0FC9E10E361 for ; Tue, 13 Aug 2024 21:13:28 +0000 (UTC) Received: by mail-yb1-f202.google.com with SMTP id 3f1490d57ef6-e11368fa2e3so3344758276.3 for ; Tue, 13 Aug 2024 14:13:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1723583607; x=1724188407; darn=lists.freedesktop.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=pReH0PE9oeGpiCITTNC9APQoZ9JJ2biqbIokrL2YiRQ=; b=cwopVIFRAzKf3f5E7ZJZ9VicSrYx3/4udxr5yzvO87/lag+8MrPN2GvNOWu46RgMos Wc8cQFLpx5Bfz8SSvYNtWKrF60jkA+yfU7u+oqDGZmQOxWXI0b4UzQbrDHZptMBDRpJX 5XS5kstXK+/kmy0jfYW2JH/3yGsJOX3ox30piwEPIp34pPNCMymTdXj6qoaQfgnMPr1v pfC+4VLRmvzZtF/anbOPlEy+W4/w+cLcZCQtcDiwgvq23AiITraEBSoISbyzyL2+n4aY txyxmrIbV1G+O8n7pBO7YtCnkSO3AMpXnO6N6kx/Y86hhC/KY5fW/PBHdXwkMJUqG/Zm 9RVw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1723583607; x=1724188407; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=pReH0PE9oeGpiCITTNC9APQoZ9JJ2biqbIokrL2YiRQ=; b=Ik4p9clc3XXAowFWz5U7xXG5gSPpPqDVbQ/YgKvGr29q7xbzsjwAV8yfY40zXt4OQ0 k3CClApcRu1O9oblcXDa2pvN5WxmRb+k5zDGc8a8blGydRirDUxnld2F/3odT8BYZHdQ VsmNDQF7NFW8wqqO7XFOYmFaCEFoA/BOO/FrwtNrS5NwOMjFp5p3jpgZmcrH4kwetlL7 cPYgHmy6gLq0ojlXyRs/rn6hyjhKgTDIgq7bvupfb/5QhipST+Hhr6DzhX9wG5y42+iB c2+Dpt/JWDNT1T8L1CRUOL9xesaK187edST5cQIA+JgppUXuXEnnCdljCECmfnklm7rJ F2og== X-Forwarded-Encrypted: i=1; AJvYcCXGt09ovfo9SSqKGbaixmSCWoR4+6mXirWIMh8vSfIGxoybA9/W6YkLhzRAySEme/etNex0Ywq56mMknbshI5OJHK74aOJdl8m8XWBCWFSQ X-Gm-Message-State: AOJu0YxjtWielEsfIWCUuwc0qqMN3WUuGABlTIDy1TCM5+K+EQyiLzwr 11ic0J2puz/AwDqITybD/GpAN9eY2FcJWyC6G4yJb70Gtu5/0v7zY6smb1t4c8G7YuspeZZYwMl 8FrBG3+xhH5MOngk1LMpadg== X-Google-Smtp-Source: AGHT+IGdJoog7C17gJZ3u9Mpmuua4ar/NqVjMJg9n8lbmms2x4B+H8pC3SjfeFBjN3NNb2AWH75VreoswTsb/e9XUw== X-Received: from almasrymina.c.googlers.com ([fda3:e722:ac3:cc00:20:ed76:c0a8:4bc5]) (user=almasrymina job=sendgmr) by 2002:a25:c584:0:b0:e0b:a2a7:df77 with SMTP id 3f1490d57ef6-e1155a42e03mr1453276.2.1723583606874; Tue, 13 Aug 2024 14:13:26 -0700 (PDT) Date: Tue, 13 Aug 2024 21:13:06 +0000 Mime-Version: 1.0 X-Mailer: git-send-email 2.46.0.76.ge559c4bf1a-goog Message-ID: <20240813211317.3381180-5-almasrymina@google.com> Subject: [PATCH net-next v19 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, 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 , Donald Hunter , 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 , Steffen Klassert , Herbert Xu , David Ahern , Willem de Bruijn , Shuah Khan , Alexei Starovoitov , Daniel Borkmann , John Fastabend , Sumit Semwal , " =?utf-8?q?Christian_K=C3=B6nig?= " , Bagas Sanjaya , Christoph Hellwig , Nikolay Aleksandrov , Taehee Yoo , 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 Reviewed-by: Pavel Begunkov --- v19: - Don't reset dma_addr on allocation/free (Jakub) v17: - Don't acquire a binding ref for every allocation (Jakub). 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 | 38 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 69 insertions(+) diff --git a/include/net/devmem.h b/include/net/devmem.h index c7bd6a0a6b9e..2e7cc46d4d3c 100644 --- a/include/net/devmem.h +++ b/include/net/devmem.h @@ -69,7 +69,20 @@ 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); void dev_dmabuf_uninstall(struct net_device *dev); +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 41e96c2f94b5..664df8325ece 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 1b693424c17d..88d188149148 100644 --- a/net/core/devmem.c +++ b/net/core/devmem.c @@ -35,6 +35,14 @@ 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; @@ -57,6 +65,36 @@ 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]; + + 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); +} + void net_devmem_unbind_dmabuf(struct net_devmem_dmabuf_binding *binding) { struct netdev_rx_queue *rxq;