From mboxrd@z Thu Jan 1 00:00:00 1970 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 7F087C54EBC for ; Wed, 4 Jan 2023 22:01:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240507AbjADWBU (ORCPT ); Wed, 4 Jan 2023 17:01:20 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60824 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240457AbjADWAj (ORCPT ); Wed, 4 Jan 2023 17:00:39 -0500 Received: from mail-pf1-x44a.google.com (mail-pf1-x44a.google.com [IPv6:2607:f8b0:4864:20::44a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4760C41D78 for ; Wed, 4 Jan 2023 14:00:15 -0800 (PST) Received: by mail-pf1-x44a.google.com with SMTP id bx21-20020a056a00429500b00582d85bb03bso2516269pfb.16 for ; Wed, 04 Jan 2023 14:00:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=content-transfer-encoding:cc:to:from:subject:message-id:references :mime-version:in-reply-to:date:from:to:cc:subject:date:message-id :reply-to; bh=rfJO+GQYze9TOg5vw18ss4rmZmF2LBjdqaB1j+Nx9Ls=; b=UgN+5U7AwdFy3wokiMPqJj/3rNQgM6rvQldU9Tt3xkUhVJtG9QQSI/KXwWNUZQhsUh p2ReVJKVGsvUbq9CY076DBiojhMMBzlGzc/dKnpStfAKWsZpDUZq6IvevSxzjjKpflq3 qptZ+jCRCpZQUtYPiWSiLrwSLksWamrIIuQv4x0XN3nD5AqR1B/w1JieR023nUH/EsvG Y19AJkmB0bGeJiOqrVceZvUwMx/MP89Np1kCP2+rIK82be9+FGW3+1qXBBJ7wv+bv6xf EodrnF5G0ybZAyYmtS/ueMSCVd9NWThnMpDiA7UBYekYT3LK6vY0JiXmLmkjbJmjn+p/ oP7A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding: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=rfJO+GQYze9TOg5vw18ss4rmZmF2LBjdqaB1j+Nx9Ls=; b=2LcWD0fPGbh+dnm7uru3wVneB0NPaTatv01DPKEOGXI7gg45FdctIGLeW/swVUM9Kh 4LU5IhXeT+w8aAPEU3w/0VgqKyvY3RZZd0ltSwbnYbPq5uX6/JdyasakteA0qoo/trNw NL4yvF+QmxKWL2M+BG5J0fYfjuWvrAuxvSic3uuWq0w1hJzdli6Y6qyMCMeuv4IjRgJh wGFMBnPakW3Za2Z22lE62/ajsjmePs8pX5d7vwBl6u3CdorrHgDWzoeVuqVULGEMS0ey 7mP4V5ZGhKlHCt0E41nThdRoHiklqB/ZjpzDnvmr88tGJgmESJoDp08vNHDysGTWDUzm 2KIg== X-Gm-Message-State: AFqh2kohWYsexklBGSg0z5repL4r99t3NKamkEiyxwtSDDAC8BnFVnLn t0XX87Oc8o02dPQypRIT5849CmUyj7MUMpiRPQQ1pcRwChc5N+0eOhi7SsHBXeystGoznpGphHH sWYjpstn70Ic/xRWn5izT2N5j+Jc52pU6ichRXdG/erip+kIBfw== X-Google-Smtp-Source: AMrXdXsNC3IVgkpL/uKDWGz/ihEARird1EJTq8ulZNnDQhJD9yhVjeTzP3t4jP0aU+IWL/EwWYE+MQs= X-Received: from sdf.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5935]) (user=sdf job=sendgmr) by 2002:a17:902:d585:b0:189:af2b:ebb1 with SMTP id k5-20020a170902d58500b00189af2bebb1mr2847509plh.35.1672869614304; Wed, 04 Jan 2023 14:00:14 -0800 (PST) Date: Wed, 4 Jan 2023 13:59:46 -0800 In-Reply-To: <20230104215949.529093-1-sdf@google.com> Mime-Version: 1.0 References: <20230104215949.529093-1-sdf@google.com> X-Mailer: git-send-email 2.39.0.314.g84b9a713c41-goog Message-ID: <20230104215949.529093-15-sdf@google.com> Subject: [PATCH bpf-next v6 14/17] xsk: Add cb area to struct xdp_buff_xsk From: Stanislav Fomichev To: bpf@vger.kernel.org Cc: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev, song@kernel.org, yhs@fb.com, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com, haoluo@google.com, jolsa@kernel.org, "=?UTF-8?q?Toke=20H=C3=B8iland-J=C3=B8rgensen?=" , David Ahern , Jakub Kicinski , Willem de Bruijn , Jesper Dangaard Brouer , Anatoly Burakov , Alexander Lobakin , Magnus Karlsson , Maryam Tahhan , xdp-hints@xdp-project.net, netdev@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org From: Toke H=C3=B8iland-J=C3=B8rgensen Add an area after the xdp_buff in struct xdp_buff_xsk that drivers can use to stash extra information to use in metadata kfuncs. The maximum size of 24 bytes means the full xdp_buff_xsk structure will take up exactly two cache lines (with the cb field spanning both). Also add a macro drivers can use to check their own wrapping structs against the available size. Cc: John Fastabend Cc: David Ahern Cc: Martin KaFai Lau Cc: Jakub Kicinski Cc: Willem de Bruijn Cc: Jesper Dangaard Brouer Cc: Anatoly Burakov Cc: Alexander Lobakin Cc: Magnus Karlsson Cc: Maryam Tahhan Cc: xdp-hints@xdp-project.net Cc: netdev@vger.kernel.org Suggested-by: Jakub Kicinski Signed-off-by: Toke H=C3=B8iland-J=C3=B8rgensen Signed-off-by: Stanislav Fomichev --- include/net/xsk_buff_pool.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/include/net/xsk_buff_pool.h b/include/net/xsk_buff_pool.h index f787c3f524b0..3e952e569418 100644 --- a/include/net/xsk_buff_pool.h +++ b/include/net/xsk_buff_pool.h @@ -19,8 +19,11 @@ struct xdp_sock; struct device; struct page; =20 +#define XSK_PRIV_MAX 24 + struct xdp_buff_xsk { struct xdp_buff xdp; + u8 cb[XSK_PRIV_MAX]; dma_addr_t dma; dma_addr_t frame_dma; struct xsk_buff_pool *pool; @@ -28,6 +31,8 @@ struct xdp_buff_xsk { struct list_head free_list_node; }; =20 +#define XSK_CHECK_PRIV_TYPE(t) BUILD_BUG_ON(sizeof(t) > offsetofend(struct= xdp_buff_xsk, cb)) + struct xsk_dma_map { dma_addr_t *dma_pages; struct device *dev; --=20 2.39.0.314.g84b9a713c41-goog