From patchwork Tue Aug 20 06:04:47 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mina Almasry X-Patchwork-Id: 13769429 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 F3F87C5320E for ; Tue, 20 Aug 2024 06:05:16 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 2CD0410E4C1; Tue, 20 Aug 2024 06:05:16 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.b="pjMiMpp4"; dkim-atps=neutral Received: from mail-pf1-f201.google.com (mail-pf1-f201.google.com [209.85.210.201]) by gabe.freedesktop.org (Postfix) with ESMTPS id 62A7910E4BB for ; Tue, 20 Aug 2024 06:05:06 +0000 (UTC) Received: by mail-pf1-f201.google.com with SMTP id d2e1a72fcca58-70eb4de4eb9so4852484b3a.2 for ; Mon, 19 Aug 2024 23:05:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1724133906; x=1724738706; 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=10IGmDK6vVQONppS0ZoKRqZPmK4GV7o8/7Q997RBAno=; b=pjMiMpp4d6vsqPkmnYaPPszVQWRl/c8r0DM0wIPNnulpLSPJZ0IurA3E1AciY0Ayhh pmhpHH9t2aELt33OSxJExW+wavJZQwqNiCGR1ABtX61uZvKuGJADCQwYMXAx4GU1gBlv G2L/CHjzPYSKkoIWS1LeNivS9jyQ2vwLwx6vsMcUtQ0etDlvexaNu6V2XhGfLe1CWSd0 6WFJPmX//rZPIPmWR/7zle/lf53bH1iGxYmnKU7tQGoUYa4Mji9EQBNmNGRHVrokFTEK 0UufkGLLUtpTnzsslCVHLs2/5ofZf14xGrq0mVQv6YCQTnxxat8kCsDZeU+AeIfIo281 bIfw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1724133906; x=1724738706; 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=10IGmDK6vVQONppS0ZoKRqZPmK4GV7o8/7Q997RBAno=; b=bTtOseCQyx1jXGJk4oFUhHxCoGC3kba4IksUUgCDWkm1+0qfTE6JDHTvXKVJW10lrq XSb49wMATuS3RIf+VcXNYhwyt49RHj8ydc6EJWx/N55qLskzy32dwT6btVip5hjz3ea4 2M/I2uilaCLxK16nJj+ANpLEZDqnmfEkOq+oHkgsaFn5Y7vNtPViJ3NYey1Y07WsnVt6 zVsnfX9yMiK9tPCHDSFhGWQRwkKhe1hMgOByrkDSF0i0vwE1utgRCAnIgxhWdH8fvdYj 5IDkwYRl1RYvTSxDgqVyPbUv5hWXT57xSaodaH0/LuuIiNQtBvuRIwu0V0Y5ytqZ7BVf FXmQ== X-Forwarded-Encrypted: i=1; AJvYcCU6wpWrvcMH2dK6tnG0ExEGSb0Sxbhuwfwqr1aYVNyZu00nY+o0m3nZG6JAjl2VsXyK4bkn/luKkzE=@lists.freedesktop.org X-Gm-Message-State: AOJu0YzTktmVQcZb208b8tOqE1x6tCdD2Bk85SW0C6y0e0hMRaxfAIok QGEZkS1q96u7aBczFjfhzfVdwcKjIiBNhL5Ljh98I4ldREsdxM/e5yQcCd84j8s7jaPmYLEPydn VJpbXyM6hf9pGH0kyGGmF6w== X-Google-Smtp-Source: AGHT+IGGDDJJOlW/qbbvZl0spAXBnd1H/egjrD+ZFgYp/a6xssIRDA3pdPhIjGNJKo3CWfILJy2FFl1udqpvsNd8iA== X-Received: from almasrymina.c.googlers.com ([fda3:e722:ac3:cc00:20:ed76:c0a8:4bc5]) (user=almasrymina job=sendgmr) by 2002:a05:6a00:6f14:b0:706:3153:978a with SMTP id d2e1a72fcca58-713c82bafe2mr169807b3a.6.1724133905516; Mon, 19 Aug 2024 23:05:05 -0700 (PDT) Date: Tue, 20 Aug 2024 06:04:47 +0000 In-Reply-To: <20240820060456.1485518-1-almasrymina@google.com> Mime-Version: 1.0 References: <20240820060456.1485518-1-almasrymina@google.com> X-Mailer: git-send-email 2.46.0.184.g6999bdac58-goog Message-ID: <20240820060456.1485518-5-almasrymina@google.com> Subject: [PATCH net-next v21 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 , 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 , 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 --- 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 0787311a8cdf..831a637a86f4 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;