From patchwork Mon Aug 19 03:54:39 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mina Almasry X-Patchwork-Id: 13767768 X-Patchwork-Delegate: kuba@kernel.org Received: from mail-yb1-f202.google.com (mail-yb1-f202.google.com [209.85.219.202]) (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 BC88C14A0A4 for ; Mon, 19 Aug 2024 03:54:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724039704; cv=none; b=jr55l4rUFAhNZ6Xi2paMSaxUcPKgMysP2CMGD5L3TSHmrq8QdUp5LKpY9/gAnNDj7kSl9ZzCHD4fLcWxgzl4t/JIybn50VP482XtkJO971/eS32N+vP5UFTQQprWmH6d7DXlbAmCZlbyNuuGHKklUuvio8a5PmEhNvsepQMfP9U= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724039704; c=relaxed/simple; bh=KwO45KqZd3TIhgCMntDmXTBc/ls6/ytjjlj+mvPmjhs=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=H9DZHOQStE1AVc3WiGsIpRkffp+IYf1//hqMcH7c0EKkejqNrv4u3ZRK3NpMk8Y3WtniCiiAruWwuVzN9Tz+jmRjaqdIDuNrOilWb8JFBKkc133AyhSFPEXsHHJY6VJ1DyFvmIRGOBTyvgDyZPl+xD3/W6BVRVdXDMmMWSPD178= 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=kB/qdbf5; arc=none smtp.client-ip=209.85.219.202 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="kB/qdbf5" Received: by mail-yb1-f202.google.com with SMTP id 3f1490d57ef6-e0bbd1ca079so7093059276.2 for ; Sun, 18 Aug 2024 20:54:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1724039698; x=1724644498; 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=Jo0cwDcH2XdL72jwowPP5DRqM80W+FJfKPsKZaD7qTk=; b=kB/qdbf5Y3wIT5jAFx64fFkNKq/dIbTIeoXQzjW0wT/Ap0eYoH71/M/Za1sl+N/pId GPJ93zjXGBCnbKQSM/Rkbqy5WnSk3kI6PRYTbDy12aD3npUkl0J5gI7naRxw1K/Mb2Gw /mtrPQOsLNZ+IfOBAaM4IXfH0ZuSreeurxBMC/5IFroGew5FABLtutwu9IXgBTHjvT7o pLdEekx07siYAlSQOeJnZn+9e0Bji38CktDL8Gei7fw78vkEZYH+8bg+Oo1FJr4EaYlu ujCxAWDcVHJ162wB6RyEDm06sbS84t+2uzGmdJR/jPSo99NiClNObYnPdMBYgq1B5im3 MLqA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1724039698; x=1724644498; 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=Jo0cwDcH2XdL72jwowPP5DRqM80W+FJfKPsKZaD7qTk=; b=cGRMvboUbq6CWTBzGQvzi1m/HHZnT/88/eIRHEXXXtueOfiPrZB23hHbyUnLG0vpIe qAvNoXo+6Z71UlGAAHcfJZB5g7aMnkdyTxKmdWPdXO1zSvYB1NkF2WD0BsGGRLa1qjlA 4xdfCo1qy1/ZhGxs7kCwRhj5PBPEeJ6elfTCLNKzoGnDbB4BTvZpXbI7uFIYiShLqvVw tyC+wxFGdtrOkzvIM5mJCV28PkttvTCSsXHOb5q0bVK+sV+keiQAjutF9HhF7Jxn7gWt AQHcVtZ9ipKK6swFxNlKRtSvngu2GDmDyTylxMaUWRhhNHAVYwoRd+jPTHdKvcc8QXeg BBKA== X-Forwarded-Encrypted: i=1; AJvYcCVSnCEBcJt1Q57+k4ujPM5FYwucivWaNxCwUWYUu9qdKTe2avXaTKWxXRNGenIFrSQTgMv0UhxWbcyciDCr4xv+aqhR X-Gm-Message-State: AOJu0YxOInZIO7PdQygsRACv91ogPo/164ZFIH70Y3eTI6+hwJHObs21 ZlPhhuI8gbQmJEaK3WLx0f42CJBfAYlAQHxfcSvyF65I84BnuPCu2jMxN76uXzmc51/LGNRen4H PH+qrDoXtts/biXOIw8Np7Q== X-Google-Smtp-Source: AGHT+IGmr9yxY0yuW7dSCL0cdDg1UGR/aZSNn2kgjWeeWCZpXBirfO1kJPAcLTyUK/CeC4h835Zv1Jo9aVRKw1dL5Q== X-Received: from almasrymina.c.googlers.com ([fda3:e722:ac3:cc00:20:ed76:c0a8:4bc5]) (user=almasrymina job=sendgmr) by 2002:a25:8007:0:b0:e11:5be8:323c with SMTP id 3f1490d57ef6-e1180f8abdbmr74381276.10.1724039697567; Sun, 18 Aug 2024 20:54:57 -0700 (PDT) Date: Mon, 19 Aug 2024 03:54:39 +0000 In-Reply-To: <20240819035448.2473195-1-almasrymina@google.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240819035448.2473195-1-almasrymina@google.com> X-Mailer: git-send-email 2.46.0.184.g6999bdac58-goog Message-ID: <20240819035448.2473195-5-almasrymina@google.com> Subject: [PATCH net-next v20 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-Patchwork-Delegate: kuba@kernel.org 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 --- 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 | 38 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 68 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..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 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;