From patchwork Wed Feb 17 12:01:21 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Lobakin X-Patchwork-Id: 384253 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 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 D4C8EC433E9 for ; Wed, 17 Feb 2021 12:03:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A111A64E5B for ; Wed, 17 Feb 2021 12:03:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232577AbhBQMDf (ORCPT ); Wed, 17 Feb 2021 07:03:35 -0500 Received: from mail2.protonmail.ch ([185.70.40.22]:40051 "EHLO mail2.protonmail.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232563AbhBQMCZ (ORCPT ); Wed, 17 Feb 2021 07:02:25 -0500 Date: Wed, 17 Feb 2021 12:01:21 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=pm.me; s=protonmail; t=1613563282; bh=uvsje6kXLionjEyqOvW16bSJRxCvIh50mtSZCtnJSvo=; h=Date:To:From:Cc:Reply-To:Subject:In-Reply-To:References:From; b=kl/0zkCDlZIHzDLdP/5tOn1YP0vKzpfihguDgaZk8EWz3aLwjyIeJUELieMqjCIGM StSJiu1OwQS4YKpoRsdNqv3A02k+fmOl2mKE2Q5FWECgR87zDRWXTVugtSju+qTHtZ 3aM1A9OJtge0ioCnQpDpKLx4KO5e9R/ArpWICScYzx6905sMBXVyLUsyBhp9aupr+r YZny4I8Ix59HJ3rWh22kboNLIMswzbjb/2C85/kUPt0rk083qhgQFOwBcaq9VmFxaE NxE0xFKVZXz+rWoEnfT719F74HayUYByBxGwKug0dFRB4baEuZxykwOKdPyyK8rxGx IBOSJ5UkptpFA== To: Daniel Borkmann , Magnus Karlsson From: Alexander Lobakin Cc: "Michael S. Tsirkin" , Jason Wang , "David S. Miller" , Jakub Kicinski , Jonathan Lemon , Alexei Starovoitov , =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= , 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 v7 bpf-next 3/6] net: add priv_flags for allow tx skb without linear Message-ID: <20210217120003.7938-4-alobakin@pm.me> In-Reply-To: <20210217120003.7938-1-alobakin@pm.me> References: <20210217120003.7938-1-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 2c1a642ecdc0..1186ba901ad3 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1518,6 +1518,8 @@ struct net_device_ops { * @IFF_FAILOVER_SLAVE_BIT: device is lower dev of a failover master device * @IFF_L3MDEV_RX_HANDLER_BIT: only invoke the rx handler of L3 master device * @IFF_LIVE_RENAME_OK_BIT: rename is allowed while device is up and running + * @IFF_TX_SKB_NO_LINEAR_BIT: device/driver is capable of xmitting frames with + * skb_headlen(skb) == 0 (data starts from frag0) * * @NETDEV_PRIV_FLAG_COUNT: total priv flags count */ @@ -1553,6 +1555,7 @@ 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, }; @@ -1595,6 +1598,7 @@ 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.