From patchwork Mon Nov 6 02:44:04 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mina Almasry X-Patchwork-Id: 13446236 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7DFA4C001B5 for ; Mon, 6 Nov 2023 02:45:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230217AbjKFCpB (ORCPT ); Sun, 5 Nov 2023 21:45:01 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41304 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230247AbjKFCow (ORCPT ); Sun, 5 Nov 2023 21:44:52 -0500 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 415C1134 for ; Sun, 5 Nov 2023 18:44:30 -0800 (PST) Received: by mail-yb1-xb49.google.com with SMTP id 3f1490d57ef6-d99ec34829aso4628683276.1 for ; Sun, 05 Nov 2023 18:44:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1699238669; x=1699843469; 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=zCln+P1ZLV/9SicyKW3j3Qj5ciapVl1fP7AJwqOPEjI=; b=YM1SEkq3uLkxlOuZL1VwFYmCBgjwqqpM8fBxRsaBTEy60dJ8XtbpbtQaaAxjD7HbFu g52d2hu5Vg6ifDN7YHs32I9K3GIv2Qd5wLNhAH/diZUToVYlgJu/OyTZOpJSxXcCAzvt Gwi1PZolJ8PvTWdsSKlJDDCzw4GNwXv0AN7cWW012U6w7cq0Q87y9MAbaHHV0EgpPNPe cBQpVXfq6A0DlhOT47C7P/06a3wQDPhtlJY4+II2nLCjUusdZOZgjsvTkjZaIAlQDZPu EXQjGMy9+0bXLt2elR/AhrrHlV3AaGPcasehjxjy1yTkvXTC6SqNSuFWE2hlNZVrl9rg SIqA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1699238669; x=1699843469; 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=zCln+P1ZLV/9SicyKW3j3Qj5ciapVl1fP7AJwqOPEjI=; b=ScnOmwbm9b+W6hDF0K7Of966PKkoW9b1PHGDo3OGs5vJ6xzHi//1PlZyh0sp3BO+ix 64GeMfwdTgefsjKmv7lBC6E+fiLWjyfU4emsfCSv28x8cJzIl2K8HLuNiJJNaft12VD7 kKQd/fzXZLKUBm5JVPOzuCpYz2gahnyjTt4XoeWxRT83/vsRhHS/iGhTw0xcYftGlPPs hF1sqgTBIWHqrmi14aMUJx0Kekgu2a3mxH2QqMYPZVmf5yXTp+ag9RbJ+ZHzCipOiu65 ZSpQiVymNauRyN462e/g32h2OYAWwecWiNAJeRSEW78TKwOtUgaqxxTP+LiTyKDyILis 8EnA== X-Gm-Message-State: AOJu0YyIclL/2DZTwOaqciOyvAZHPR8SMFsRj0pjzwxDM7Y59l1WRnPi h4hZnPvOxefni98wrlFpbhuipU2EQ1d7o6JhFA== X-Google-Smtp-Source: AGHT+IFZen1iqDzFOOtrS1FJ3xpxQBaOHPO073Jp0lQAOyUF53fYpT9RjFB9mOvm7AmbRG1CjowhqVQUNAxlAUzmOA== X-Received: from almasrymina.svl.corp.google.com ([2620:15c:2c4:200:35de:fff:97b7:db3e]) (user=almasrymina job=sendgmr) by 2002:a25:7909:0:b0:da3:ab41:304a with SMTP id u9-20020a257909000000b00da3ab41304amr308351ybc.4.1699238669418; Sun, 05 Nov 2023 18:44:29 -0800 (PST) Date: Sun, 5 Nov 2023 18:44:04 -0800 In-Reply-To: <20231106024413.2801438-1-almasrymina@google.com> Mime-Version: 1.0 References: <20231106024413.2801438-1-almasrymina@google.com> X-Mailer: git-send-email 2.42.0.869.gea05f2083d-goog Message-ID: <20231106024413.2801438-6-almasrymina@google.com> Subject: [RFC PATCH v3 05/12] netdev: netdevice devmem allocator From: Mina Almasry To: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org Cc: Mina Almasry , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Jesper Dangaard Brouer , Ilias Apalodimas , Arnd Bergmann , David Ahern , Willem de Bruijn , Shuah Khan , Sumit Semwal , " =?utf-8?q?Christian_K=C3=B6nig?= " , Shakeel Butt , Jeroen de Borst , Praveen Kaligineedi , Willem de Bruijn , Kaiyuan Zhang Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Implement netdev devmem allocator. The allocator takes a given struct netdev_dmabuf_binding as input and allocates page_pool_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 page_pool_iov struct. page_pool_iov are refcounted and are freed back to the binding when the refcount drops to 0. Signed-off-by: Willem de Bruijn Signed-off-by: Kaiyuan Zhang Signed-off-by: Mina Almasry --- include/linux/netdevice.h | 13 ++++++++++++ include/net/page_pool/helpers.h | 28 +++++++++++++++++++++++++ net/core/dev.c | 37 +++++++++++++++++++++++++++++++++ 3 files changed, 78 insertions(+) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index eeeda849115c..1c351c138a5b 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -843,6 +843,9 @@ struct netdev_dmabuf_binding { }; #ifdef CONFIG_DMA_SHARED_BUFFER +struct page_pool_iov * +netdev_alloc_devmem(struct netdev_dmabuf_binding *binding); +void netdev_free_devmem(struct page_pool_iov *ppiov); void __netdev_devmem_binding_free(struct netdev_dmabuf_binding *binding); int netdev_bind_dmabuf(struct net_device *dev, unsigned int dmabuf_fd, struct netdev_dmabuf_binding **out); @@ -850,6 +853,16 @@ void netdev_unbind_dmabuf(struct netdev_dmabuf_binding *binding); int netdev_bind_dmabuf_to_queue(struct net_device *dev, u32 rxq_idx, struct netdev_dmabuf_binding *binding); #else +static inline struct page_pool_iov * +netdev_alloc_devmem(struct netdev_dmabuf_binding *binding) +{ + return NULL; +} + +static inline void netdev_free_devmem(struct page_pool_iov *ppiov) +{ +} + static inline void __netdev_devmem_binding_free(struct netdev_dmabuf_binding *binding) { diff --git a/include/net/page_pool/helpers.h b/include/net/page_pool/helpers.h index 4ebd544ae977..78cbb040af94 100644 --- a/include/net/page_pool/helpers.h +++ b/include/net/page_pool/helpers.h @@ -83,6 +83,34 @@ static inline u64 *page_pool_ethtool_stats_get(u64 *data, void *stats) } #endif +/* page_pool_iov support */ + +static inline struct dmabuf_genpool_chunk_owner * +page_pool_iov_owner(const struct page_pool_iov *ppiov) +{ + return ppiov->owner; +} + +static inline unsigned int page_pool_iov_idx(const struct page_pool_iov *ppiov) +{ + return ppiov - page_pool_iov_owner(ppiov)->ppiovs; +} + +static inline dma_addr_t +page_pool_iov_dma_addr(const struct page_pool_iov *ppiov) +{ + struct dmabuf_genpool_chunk_owner *owner = page_pool_iov_owner(ppiov); + + return owner->base_dma_addr + + ((dma_addr_t)page_pool_iov_idx(ppiov) << PAGE_SHIFT); +} + +static inline struct netdev_dmabuf_binding * +page_pool_iov_binding(const struct page_pool_iov *ppiov) +{ + return page_pool_iov_owner(ppiov)->binding; +} + /** * page_pool_dev_alloc_pages() - allocate a page. * @pool: pool from which to allocate diff --git a/net/core/dev.c b/net/core/dev.c index c8c3709d42c8..2315bbc03ec8 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -156,6 +156,7 @@ #include #include #include +#include #include "dev.h" #include "net-sysfs.h" @@ -2077,6 +2078,42 @@ void __netdev_devmem_binding_free(struct netdev_dmabuf_binding *binding) kfree(binding); } +struct page_pool_iov *netdev_alloc_devmem(struct netdev_dmabuf_binding *binding) +{ + struct dmabuf_genpool_chunk_owner *owner; + struct page_pool_iov *ppiov; + unsigned long dma_addr; + 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; + ppiov = &owner->ppiovs[index]; + + netdev_devmem_binding_get(binding); + + return ppiov; +} + +void netdev_free_devmem(struct page_pool_iov *ppiov) +{ + struct netdev_dmabuf_binding *binding = page_pool_iov_binding(ppiov); + + refcount_set(&ppiov->refcount, 1); + + if (gen_pool_has_addr(binding->chunk_pool, + page_pool_iov_dma_addr(ppiov), PAGE_SIZE)) + gen_pool_free(binding->chunk_pool, + page_pool_iov_dma_addr(ppiov), PAGE_SIZE); + + netdev_devmem_binding_put(binding); +} + void netdev_unbind_dmabuf(struct netdev_dmabuf_binding *binding) { struct netdev_rx_queue *rxq;