From patchwork Thu Jul 16 22:16:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Bianconi X-Patchwork-Id: 1330593 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: incoming-bpf@patchwork.ozlabs.org Delivered-To: patchwork-incoming-bpf@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=bpf-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=kernel.org Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=default header.b=f3lTC/Zk; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4B79bV1QFRz9sR4 for ; Fri, 17 Jul 2020 09:35:18 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726691AbgGPXfR (ORCPT ); Thu, 16 Jul 2020 19:35:17 -0400 Received: from mail.kernel.org ([198.145.29.99]:42510 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726243AbgGPXfR (ORCPT ); Thu, 16 Jul 2020 19:35:17 -0400 Received: from localhost.localdomain.com (unknown [151.48.133.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id D516B207FB; Thu, 16 Jul 2020 22:17:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594937823; bh=DH8W/hh60f/yucHMLcmPgq4bufUV9mRBqjqUBraxbyQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=f3lTC/ZknJc5U1fwCnniqkFGCXu2TCRNOkEKrxt4IU8j6qis4yBhUWqck+pVpwImz SLKkNibEA8wGTBENNOd2W6j5D6nYujr+SOQ2PTtDLOQo8VaA4qKFIyH61r3EQ3kKp4 I5S+cHUYzDWpjRZyn8MrJDlOPBZUAOIwcCxmj2zA= From: Lorenzo Bianconi To: netdev@vger.kernel.org Cc: davem@davemloft.net, bpf@vger.kernel.org, kuba@kernel.org, ilias.apalodimas@linaro.org, lorenzo.bianconi@redhat.com, brouer@redhat.com, echaudro@redhat.com, sameehj@amazon.com Subject: [PATCH v2 net-next 1/6] xdp: introduce xdp_get_shared_info_from_{buff, frame} utility routines Date: Fri, 17 Jul 2020 00:16:29 +0200 Message-Id: <45a48fd7b97a3ada0bbbf017ec9c4b74ac6e5798.1594936660.git.lorenzo@kernel.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: References: MIME-Version: 1.0 Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Introduce xdp_get_shared_info_from_{buff,frame} utility routines to get skb_shared_info from xdp buffer/frame pointer. xdp_get_shared_info_from_{buff,frame} will be used to implement xdp multi-buffer support Signed-off-by: Lorenzo Bianconi --- include/net/xdp.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/include/net/xdp.h b/include/net/xdp.h index 609f819ed08b..d3005bef812f 100644 --- a/include/net/xdp.h +++ b/include/net/xdp.h @@ -85,6 +85,12 @@ struct xdp_buff { ((xdp)->data_hard_start + (xdp)->frame_sz - \ SKB_DATA_ALIGN(sizeof(struct skb_shared_info))) +static inline struct skb_shared_info * +xdp_get_shared_info_from_buff(struct xdp_buff *xdp) +{ + return (struct skb_shared_info *)xdp_data_hard_end(xdp); +} + struct xdp_frame { void *data; u16 len; @@ -98,6 +104,15 @@ struct xdp_frame { struct net_device *dev_rx; /* used by cpumap */ }; +static inline struct skb_shared_info * +xdp_get_shared_info_from_frame(struct xdp_frame *frame) +{ + void *data_hard_start = frame->data - frame->headroom - sizeof(*frame); + + return (struct skb_shared_info *)(data_hard_start + frame->frame_sz - + SKB_DATA_ALIGN(sizeof(struct skb_shared_info))); +} + /* Clear kernel pointers in xdp_frame */ static inline void xdp_scrub_frame(struct xdp_frame *frame) {