From patchwork Tue Feb 16 17:27:29 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Lobakin X-Patchwork-Id: 384294 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5A66EC4332D for ; Tue, 16 Feb 2021 17:28:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3ABA164E68 for ; Tue, 16 Feb 2021 17:28:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231135AbhBPR2d (ORCPT ); Tue, 16 Feb 2021 12:28:33 -0500 Received: from mail2.protonmail.ch ([185.70.40.22]:37450 "EHLO mail2.protonmail.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230166AbhBPR2T (ORCPT ); Tue, 16 Feb 2021 12:28:19 -0500 Date: Tue, 16 Feb 2021 17:27:29 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=pm.me; s=protonmail; t=1613496456; bh=QDosC33QktE2waBddw6zce1oGZOsZXv08mklFMTqals=; h=Date:To:From:Cc:Reply-To:Subject:In-Reply-To:References:From; b=Cew1qXA8sVizRsOO/sBB08Vvi2RQzlKUQKMjMedo4Dx6bqGc/ncLYLbpnVK8nCf0g xIdN0fBBx2xlZNBnv6oc7YLH6k8L6zzsW3AJUO3BKA/+Hqf/RRzvYX1feYv0y14JCc ukS8L2DrQc7Lp/vGIyR17NZgwVD/oBMAforC5kkw+MraAvrhOW+50mdE2odpVNNfDB /1wGWTK6dhfVVlUKC78p6qi0tOMEPd9s3edjarQHQcYNwtjMtAirCyi528sY6jjttY rWPEudmx75po4cj/tpbk6OfBXXAvLjHSD+p3+xzU49ywOD7eav8CE0o8PyOlCR76UF QKeHA9ZAqsuLA== To: Magnus Karlsson , =?utf-8?q?Bj=C3=B6rn_T?= =?utf-8?b?w7ZwZWw=?= From: Alexander Lobakin Cc: "Michael S. Tsirkin" , Jason Wang , "David S. Miller" , Jakub Kicinski , Jonathan Lemon , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , KP Singh , Paolo Abeni , Eric Dumazet , Xuan Zhuo , Dust Li , Alexander Lobakin , virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org Reply-To: Alexander Lobakin Subject: [PATCH v6 bpf-next 3/6] net: add priv_flags for allow tx skb without linear Message-ID: <20210216172640.374487-4-alobakin@pm.me> In-Reply-To: <20210216172640.374487-1-alobakin@pm.me> References: <20210216172640.374487-1-alobakin@pm.me> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Xuan Zhuo In some cases, we hope to construct skb directly based on the existing memory without copying data. In this case, the page will be placed directly in the skb, and the linear space of skb is empty. But unfortunately, many the network card does not support this operation. For example Mellanox Technologies MT27710 Family [ConnectX-4 Lx] will get the following error message: mlx5_core 0000:3b:00.1 eth1: Error cqe on cqn 0x817, ci 0x8, qn 0x1dbb, opcode 0xd, syndrome 0x1, vendor syndrome 0x68 00000000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00000030: 00 00 00 00 60 10 68 01 0a 00 1d bb 00 0f 9f d2 WQE DUMP: WQ size 1024 WQ cur size 0, WQE index 0xf, len: 64 00000000: 00 00 0f 0a 00 1d bb 03 00 00 00 08 00 00 00 00 00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00000020: 00 00 00 2b 00 08 00 00 00 00 00 05 9e e3 08 00 00000030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 mlx5_core 0000:3b:00.1 eth1: ERR CQE on SQ: 0x1dbb So a priv_flag is added here to indicate whether the network card supports this feature. Signed-off-by: Xuan Zhuo Suggested-by: Alexander Lobakin [ alobakin: give a new flag more detailed description ] Signed-off-by: Alexander Lobakin --- include/linux/netdevice.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 0a9b2b31f411..ecaf67efab5b 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1525,6 +1525,8 @@ struct net_device_ops { * @IFF_FAILOVER_SLAVE: device is lower dev of a failover master device * @IFF_L3MDEV_RX_HANDLER: only invoke the rx handler of L3 master device * @IFF_LIVE_RENAME_OK: rename is allowed while device is up and running + * @IFF_TX_SKB_NO_LINEAR: device/driver is capable of xmitting frames with + * skb_headlen(skb) == 0 (data starts from frag0) */ enum netdev_priv_flags { IFF_802_1Q_VLAN_BIT, @@ -1558,6 +1560,7 @@ enum netdev_priv_flags { IFF_FAILOVER_SLAVE_BIT, IFF_L3MDEV_RX_HANDLER_BIT, IFF_LIVE_RENAME_OK_BIT, + IFF_TX_SKB_NO_LINEAR_BIT, NETDEV_PRIV_FLAG_COUNT, }; @@ -1600,6 +1603,7 @@ static_assert(sizeof(netdev_priv_flags_t) * BITS_PER_BYTE >= #define IFF_FAILOVER_SLAVE __IFF(FAILOVER_SLAVE) #define IFF_L3MDEV_RX_HANDLER __IFF(L3MDEV_RX_HANDLER) #define IFF_LIVE_RENAME_OK __IFF(LIVE_RENAME_OK) +#define IFF_TX_SKB_NO_LINEAR __IFF(TX_SKB_NO_LINEAR) /** * struct net_device - The DEVICE structure.