From patchwork Sat Aug 31 00:43:04 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mina Almasry X-Patchwork-Id: 13785809 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 6BEABCA101B for ; Sat, 31 Aug 2024 00:43:35 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7236210E78B; Sat, 31 Aug 2024 00:43:33 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.b="XP3XmiWn"; dkim-atps=neutral Received: from mail-yw1-f202.google.com (mail-yw1-f202.google.com [209.85.128.202]) by gabe.freedesktop.org (Postfix) with ESMTPS id 096BC10E78B for ; Sat, 31 Aug 2024 00:43:31 +0000 (UTC) Received: by mail-yw1-f202.google.com with SMTP id 00721157ae682-6b3fec974e5so45325907b3.1 for ; Fri, 30 Aug 2024 17:43:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1725065010; x=1725669810; 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=SPsEhcMOBNHkoRP+dE+c2ouSgpLWKznnjXqaGgh0L3g=; b=XP3XmiWngtTmEOa6B3+ifC1ONBm8F/KMNlpJ7vdqn+0+0bPNIML25GaQ8OgRV1EJoN 9KlubZWsQmfo5wYwFglJRB7e6SwYG6Px60Sn+3IEvzfkXsFS4POcb+p0vo1fixJs96oY 6Rs9DHFpVTSzFAqyMQ3Vw3NovEFrYVpDcQcEkXaTHiKZkRgELnz8GWnOD4SLWpZ6zRg5 yG5aV0kmxVoDTh+1tIfeNNebkyuQdlOFlUFJ+INN40uFeLhg1bcUoWkfP5fJteCawon1 Vatxce1GRnkW0+ltAZoeL80Gf1nMZZhDN2gpr6eknQG9jbkGaDfYlc9gd93t8qYPmmu8 tM9w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1725065010; x=1725669810; 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=SPsEhcMOBNHkoRP+dE+c2ouSgpLWKznnjXqaGgh0L3g=; b=a/Z+CjOaLygXtfE2HuPSe9I9HF/u7WLA4yOejkXoSux9OwryAqBzgFFXrpk9/ba7KN f14haDvCDGRyOBu/2uGNIRNx67YyL9E1tvpDKwwP6RIEmNdSuIVa8xKlqbjkaY89Fr8m hRrRwX/9LpvpUYV7aqfUxesjX8J14OR4QeIkAogdMr/eJ0mJ4S2GkxR4L1yMuTKucDnw ZcS9sLeCTp24giJ4nvnOB7uFeZnoZtZZhYc68lT8DK7dW4h4ixpl1lzmWpi8+wqV4htZ 4QOq6Rq01BiHXyxhM3cs1sOa+kCQGdY2fTs7zDvyiKssn7+OIvDCDpnzyNIjUxRE5+Nf AaZQ== X-Forwarded-Encrypted: i=1; AJvYcCXLnDNmqr0ykJFkwfbps0grYyciI8ZitCP2XqpY3BUVycTOtaRhmjHfSjfykDPZB2tjqrhBAUTCChI=@lists.freedesktop.org X-Gm-Message-State: AOJu0YyDVKiGuaMOdppr6Y6OxvqZZISg4cgqGM6QA9zvxTDV/BpVS0pU cOwGscHeKwLKSCzx1V8zkVhxG/F9GQDf/iBnAvInI5RL/8uWJIHZIyUGb9t7DvFNFNCEVY8c8oK 84ZRJgKEGPpbvOR9DMUafhw== X-Google-Smtp-Source: AGHT+IExLKA/WuEj64lWpm3GfmhCMlDgrQkLH3kCViC7zyNP0YVC0+jlo63IhVC0FND18WtuyQDn/hZn2vCdRjXnPQ== X-Received: from almasrymina.c.googlers.com ([fda3:e722:ac3:cc00:20:ed76:c0a8:4bc5]) (user=almasrymina job=sendgmr) by 2002:a05:690c:6d8b:b0:6be:9d4a:f097 with SMTP id 00721157ae682-6d40fc1ee69mr1566627b3.7.1725065009897; Fri, 30 Aug 2024 17:43:29 -0700 (PDT) Date: Sat, 31 Aug 2024 00:43:04 +0000 In-Reply-To: <20240831004313.3713467-1-almasrymina@google.com> Mime-Version: 1.0 References: <20240831004313.3713467-1-almasrymina@google.com> X-Mailer: git-send-email 2.46.0.469.g59c65b2a67-goog Message-ID: <20240831004313.3713467-5-almasrymina@google.com> Subject: [PATCH net-next v24 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 , Steffen Klassert , Herbert Xu , David Ahern , Willem de Bruijn , " =?utf-8?b?QmrDtnJu?= =?utf-8?b?IFTDtnBlbA==?= " , Magnus Karlsson , Maciej Fijalkowski , Jonathan Lemon , Shuah Khan , Alexei Starovoitov , Daniel Borkmann , John Fastabend , 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 , Bagas Sanjaya , Christoph Hellwig , Nikolay Aleksandrov , Taehee Yoo , 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 Reviewed-by: Jakub Kicinski --- v23: - WARN_ON when we don't see the dma_addr in the gen_pool (Jakub) v20: - Removed dma_addr field in dmabuf_genpool_chunk_owner not used in this patch (moved to later patch where it's used). 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 | 17 +++++++++++++++++ net/core/devmem.c | 41 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 71 insertions(+) diff --git a/include/net/devmem.h b/include/net/devmem.h index 3e406b6bfcf3..d315028c1499 100644 --- a/include/net/devmem.h +++ b/include/net/devmem.h @@ -73,7 +73,20 @@ int net_devmem_bind_dmabuf_to_queue(struct net_device *dev, u32 rxq_idx, struct net_devmem_dmabuf_binding *binding, struct netlink_ext_ack *extack); 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..0fbc0999091a 100644 --- a/include/net/netmem.h +++ b/include/net/netmem.h @@ -16,6 +16,23 @@ struct net_iov { struct dmabuf_genpool_chunk_owner *owner; }; +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 3b8fa6a50147..ad222d108d37 100644 --- a/net/core/devmem.c +++ b/net/core/devmem.c @@ -33,6 +33,14 @@ 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; @@ -55,6 +63,39 @@ 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 (WARN_ON(!gen_pool_has_addr(binding->chunk_pool, dma_addr, + PAGE_SIZE))) + return; + + 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;