From patchwork Tue Sep 10 17:14:48 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mina Almasry X-Patchwork-Id: 13799082 Received: from mail-yw1-f201.google.com (mail-yw1-f201.google.com [209.85.128.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 521F41A38CD for ; Tue, 10 Sep 2024 17:15:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725988516; cv=none; b=LPAuh8e3BB8xCJs8XutileZdtOatQJOy7UtX60EP+J5NCfLRzu8m9RfcdEWLuDW7pNIU3FUKmToHC+BjNsOdSplKGEFKrqAxNUtRKDZ7alZJmVGWMlhMWhpmkoNu/kkFFYEgbF0+A+zv7AuUYh8SfyjcYj2vSYpkXsiFNt1tlAU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725988516; c=relaxed/simple; bh=MKkGxA3WqicLDk+3KCIQS97Cqppi5eNjK5EKzCTQ1VE=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=olVQF55y4mESyjh0rhZ3ZOZfOBAJffnQpRbiQih3WVs/EC7TOrv4HE4n/p261ybbbDwFo26I5BOdX9F8qvAzIVuHOiFmHcMyrU9ERjjwDLKrBPGKYDHny3Zkkb5I7bLZBNti1f82wy35ISmQoEY7SvRTsj1IH0KFE0DNbJhDlss= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--almasrymina.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=DGgYd3O8; arc=none smtp.client-ip=209.85.128.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--almasrymina.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="DGgYd3O8" Received: by mail-yw1-f201.google.com with SMTP id 00721157ae682-690404fd230so28348967b3.3 for ; Tue, 10 Sep 2024 10:15:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1725988509; x=1726593309; 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=VPRoHm5ctqVLQP6zA14FlIWbVV3YFsM8Hl9EN9iSjUU=; b=DGgYd3O8L5+kgsThfQp6SU5dN+4X3Pv0hob58VhNRsN19mEj0eomOkQvjrZIB2IljC pZ5MlXdZ3KX+V0TTIgG+QLxKKPvBOc+ORJHxmVl6DHY+G9t7TUAsCFb5ZEOEZwY+6S4H zLCX5d4TnPz73oRMq5EiHFTFexO59wvpYkOkE2JEQY7oH6OFgDt7/Allrepd1EEypC53 y59V6i7icSPGkhVNnophLIQV+vKSu1jleQJyp/FSjRpKim2ClZISxXTRWGK4+UDTEd4V OGIhrY8Nq44vvzqTDFMU3ECxx6cjnAP+BYC25Vka1QEqf4NPb1qloMFFtlBYZyP2pbAN D09w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1725988509; x=1726593309; 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=VPRoHm5ctqVLQP6zA14FlIWbVV3YFsM8Hl9EN9iSjUU=; b=L+Levg0/VIxrhky/G8PBXs2ipoVWsQeD1MJfzX1VP5qkv2aaw2DekDLw/coRXrG/zu LzrpD+3PG0VLhd/vqEXnntr4oKvGJ8Id6HAWXLBVHrMd0w4CWCfaxVTfxSWSOEIcbOgp 5oNRifWkgKdqCg7d7V5rIuCCO83wUn+uwdnqYhq9T6F5WYRODL5P3jJpZk4KseTTqUyd bt8csmwG7FrZhCwHaoEyCipz2+adtLzl9a0GTl+8l6TqEQhOQv/neCn4mNLSKDpiS2S9 OQQXDQJeBh/K9k17mLgxlLKb+jwgVmpioeLVmjZTuGMAOt12JkrN4u/Nufjaa71mbdSw q7Qw== X-Forwarded-Encrypted: i=1; AJvYcCW5tFuju8c5i7aRLcdrJwCeiaz6TVXwWkashK2lJk5Um6lkseJtsZm9zwt5dd6ZrOpBCy0z0bLYfGMliQ==@vger.kernel.org X-Gm-Message-State: AOJu0YzZZ6LtWwB7zmLLdj8BFvNrJ4QY5QeXpQYeR1kAeCOYETgtsWw/ DHHE64gdXlkEL86SvdL2U5GauCGSO3ZgtyHsth5+VUQRniuObzZXqL0AmW8fUGksSeBrCOO3wOJ OqLbh4yMpg5BWJjcwcGc55g== X-Google-Smtp-Source: AGHT+IHBMQkcGr1YCCW3qFhgLQf69bwnUCWoN0wW6h2xW02h5QE5a99PC3GYqOf2BN0aqXHaJhlcjU6ZEKPx90xt1w== X-Received: from almasrymina.c.googlers.com ([fda3:e722:ac3:cc00:20:ed76:c0a8:4bc5]) (user=almasrymina job=sendgmr) by 2002:a05:690c:2c12:b0:66a:764f:e57f with SMTP id 00721157ae682-6dba6e28b59mr37067b3.7.1725988509066; Tue, 10 Sep 2024 10:15:09 -0700 (PDT) Date: Tue, 10 Sep 2024 17:14:48 +0000 In-Reply-To: <20240910171458.219195-1-almasrymina@google.com> Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240910171458.219195-1-almasrymina@google.com> X-Mailer: git-send-email 2.46.0.598.g6f2099f65c-goog Message-ID: <20240910171458.219195-5-almasrymina@google.com> Subject: [PATCH net-next v26 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 , "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 , " =?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 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). fix allocator --- net/core/devmem.c | 41 +++++++++++++++++++++++++++++++++++++++++ net/core/devmem.h | 34 ++++++++++++++++++++++++++++++++++ 2 files changed, 75 insertions(+) diff --git a/net/core/devmem.c b/net/core/devmem.c index 8dd7beb080d2..9beb03763dc9 100644 --- a/net/core/devmem.c +++ b/net/core/devmem.c @@ -34,6 +34,14 @@ 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; @@ -56,6 +64,39 @@ 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; diff --git a/net/core/devmem.h b/net/core/devmem.h index c50f91d858dd..b1db4877cff9 100644 --- a/net/core/devmem.h +++ b/net/core/devmem.h @@ -74,6 +74,23 @@ int net_devmem_bind_dmabuf_to_queue(struct net_device *dev, u32 rxq_idx, struct netlink_ext_ack *extack); void dev_dmabuf_uninstall(struct net_device *dev); +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; +} + static inline void net_devmem_dmabuf_binding_get(struct net_devmem_dmabuf_binding *binding) { @@ -89,7 +106,13 @@ net_devmem_dmabuf_binding_put(struct net_devmem_dmabuf_binding *binding) __net_devmem_dmabuf_binding_free(binding); } +struct net_iov * +net_devmem_alloc_dmabuf(struct net_devmem_dmabuf_binding *binding); +void net_devmem_free_dmabuf(struct net_iov *ppiov); + #else +struct net_devmem_dmabuf_binding; + static inline void __net_devmem_dmabuf_binding_free(struct net_devmem_dmabuf_binding *binding) { @@ -119,6 +142,17 @@ net_devmem_bind_dmabuf_to_queue(struct net_device *dev, u32 rxq_idx, static inline void dev_dmabuf_uninstall(struct net_device *dev) { } + +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) +{ +} + #endif #endif /* _NET_DEVMEM_H */