From patchwork Wed Jan 11 04:21:50 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Matthew Wilcox (Oracle)" X-Patchwork-Id: 13095972 X-Patchwork-Delegate: kuba@kernel.org 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 AE277C46467 for ; Wed, 11 Jan 2023 04:24:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235802AbjAKEYa (ORCPT ); Tue, 10 Jan 2023 23:24:30 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34016 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235551AbjAKEXS (ORCPT ); Tue, 10 Jan 2023 23:23:18 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D727213DEE for ; Tue, 10 Jan 2023 20:22:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=cNwP0/WvOKg0Wgjxh7GnXV1CpjoOIUWMfQYwPvXk4mY=; b=geBpLgOanato67yHa3PwwMr+ps J0i+CTTY7BVztaFUBdnUJY794WUJrkIihg+9U1s8Fno1dzuBOmjnkGMtnElTWov/1Owkx3h4pPDmC 7oRwKAxWj8vk0tBCecA+0Lt6LtDOI+MzEKIyJNvqWdQrjboBGe9rbZ6gax3F3GhxUij1ew+mEspBO e7RyNArQeoVnFrkKTa0LAOyMuRDZ6DqlBrtPiMvbIB+FVkEyv1tC2uXzIn2im7Bg2pY74ayVXnyrj V8ki2aGjasVV7gjl1jiEJtrG97Ahy2XxwdNyjrRceRETGqiM0s6wQqyaSTmyz2EzDf/K+kWECVKr4 lQlaDrAA==; Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1pFScy-003nxk-AX; Wed, 11 Jan 2023 04:22:16 +0000 From: "Matthew Wilcox (Oracle)" To: Jesper Dangaard Brouer , Ilias Apalodimas Cc: "Matthew Wilcox (Oracle)" , netdev@vger.kernel.org, linux-mm@kvack.org, Shakeel Butt , Jesper Dangaard Brouer , Jesse Brandeburg Subject: [PATCH v3 02/26] netmem: Add utility functions Date: Wed, 11 Jan 2023 04:21:50 +0000 Message-Id: <20230111042214.907030-3-willy@infradead.org> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20230111042214.907030-1-willy@infradead.org> References: <20230111042214.907030-1-willy@infradead.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org netmem_page() is defined this way to preserve constness. page_netmem() doesn't call compound_head() because netmem users always use the head page; it does include a debugging assert to check that it's true. Signed-off-by: Matthew Wilcox (Oracle) Acked-by: Jesper Dangaard Brouer Reviewed-by: Jesse Brandeburg --- include/net/page_pool.h | 59 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) diff --git a/include/net/page_pool.h b/include/net/page_pool.h index cbea4df54918..414907e67ff6 100644 --- a/include/net/page_pool.h +++ b/include/net/page_pool.h @@ -96,6 +96,65 @@ NETMEM_MATCH(_refcount, _refcount); #undef NETMEM_MATCH static_assert(sizeof(struct netmem) <= sizeof(struct page)); +#define netmem_page(nmem) (_Generic((nmem), \ + const struct netmem *: (const struct page *)nmem, \ + struct netmem *: (struct page *)nmem)) + +static inline struct netmem *page_netmem(struct page *page) +{ + VM_BUG_ON_PAGE(PageTail(page), page); + return (struct netmem *)page; +} + +static inline unsigned long netmem_pfn(const struct netmem *nmem) +{ + return page_to_pfn(netmem_page(nmem)); +} + +static inline unsigned long netmem_nid(const struct netmem *nmem) +{ + return page_to_nid(netmem_page(nmem)); +} + +static inline struct netmem *virt_to_netmem(const void *x) +{ + return page_netmem(virt_to_head_page(x)); +} + +static inline void *netmem_to_virt(const struct netmem *nmem) +{ + return page_to_virt(netmem_page(nmem)); +} + +static inline void *netmem_address(const struct netmem *nmem) +{ + return page_address(netmem_page(nmem)); +} + +static inline int netmem_ref_count(const struct netmem *nmem) +{ + return page_ref_count(netmem_page(nmem)); +} + +static inline void netmem_get(struct netmem *nmem) +{ + struct folio *folio = (struct folio *)nmem; + + folio_get(folio); +} + +static inline void netmem_put(struct netmem *nmem) +{ + struct folio *folio = (struct folio *)nmem; + + folio_put(folio); +} + +static inline bool netmem_is_pfmemalloc(const struct netmem *nmem) +{ + return nmem->pp_magic & BIT(1); +} + /* * Fast allocation side cache array/stack *