From patchwork Tue Oct 13 07:27:28 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xin Long X-Patchwork-Id: 11835079 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 X-Spam-Level: X-Spam-Status: No, score=-12.6 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 5A5F5C433DF for ; Tue, 13 Oct 2020 07:28:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1E5C520872 for ; Tue, 13 Oct 2020 07:28:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="IneJXeAP" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390133AbgJMH2Q (ORCPT ); Tue, 13 Oct 2020 03:28:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55424 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390091AbgJMH2Q (ORCPT ); Tue, 13 Oct 2020 03:28:16 -0400 Received: from mail-pl1-x62e.google.com (mail-pl1-x62e.google.com [IPv6:2607:f8b0:4864:20::62e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E7D72C0613D0; Tue, 13 Oct 2020 00:28:15 -0700 (PDT) Received: by mail-pl1-x62e.google.com with SMTP id d23so10200440pll.7; Tue, 13 Oct 2020 00:28:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :in-reply-to:references; bh=5n9MDJ2fdPNgSTG4tMoW/SRIt8/WSpHVsbv6RmWVU3Y=; b=IneJXeAP2AYogjJidckSS6L0uH6PzRtuh2cbtkEIe+QHUxglenWggeRo9YbTCQKGFD ZAJRVJEYSm/jajfnXKgdqb8QGBQvWUYlCdpihA2cnkFhyEMnIIz3ZKXI/g20reV8LIwD 05lULbBQ+TVleetRadD+/ruiC3jxeWMiCdOgtXSrp2nNrPBqc3b0UcN0izVZf8qyO967 8h2lBr9AfvKNL95rTZO8PBHv+/BDq23/oA03PMeveySDOfK1rI23EyfAErqpuUltU/rB qj3djH53VHvR38OE+2jgR1C5jjmruEzbdR01Jza8T90/ZS+1Fp+jVv+ht+XFdlzUzoln Dd/Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:in-reply-to:references; bh=5n9MDJ2fdPNgSTG4tMoW/SRIt8/WSpHVsbv6RmWVU3Y=; b=iM6UOh0EEngvDEP94U7fNQkPvB/mEuJk3FY8Iq5vLDvvUlSA5idNAMCubnBvfgI8a7 /cCnJEFDg3MIvDvd5ptjaKHt1fyybUD40VO2NDZvW95t1o3eWNAJN/eOHY63Hl+VYqhl UChPZb8XdzCOdbYipatleBnODGE7024NIztf2MkUjAEXMsiKe/P95ukfCfRFTei+qthG ftKqGfQKHPaI3EAObPZaLl7WmGpMfRMRemUP+keqmn5vCvIPINBIotG+l8pci5q7UELn dZSZ+ZoHDrbDlKEs+9XAKBAECRjG4bX+lMXQnK1+LFPTo99CatZHdx5zC8Vf4keaBO5G zV9Q== X-Gm-Message-State: AOAM531f0TqGSWhAyfZ2RFOCTEHOEblAvlg+bnSm5T4mmWGtJVuGi5ac 72l5P17tAinqmFqgXCuIc5LeyxcmH/g= X-Google-Smtp-Source: ABdhPJxo+/Jpy23MnxFz6eP3WmtW9zAnNtIjs6ZxK8+xmMCYe2/HmmfkIiIzxSRHcWEhyzTUwpYWrg== X-Received: by 2002:a17:90a:1903:: with SMTP id 3mr24682806pjg.74.1602574095104; Tue, 13 Oct 2020 00:28:15 -0700 (PDT) Received: from localhost ([209.132.188.80]) by smtp.gmail.com with ESMTPSA id n19sm21961236pfu.24.2020.10.13.00.28.13 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 13 Oct 2020 00:28:14 -0700 (PDT) From: Xin Long To: network dev , linux-sctp@vger.kernel.org Cc: Marcelo Ricardo Leitner , Neil Horman , Michael Tuexen , davem@davemloft.net, gnault@redhat.com, pabeni@redhat.com, willemdebruijn.kernel@gmail.com Subject: [PATCHv3 net-next 03/16] udp: support sctp over udp in skb_udp_tunnel_segment Date: Tue, 13 Oct 2020 15:27:28 +0800 Message-Id: X-Mailer: git-send-email 2.1.0 In-Reply-To: References: In-Reply-To: References: Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org For the gso of sctp over udp packets, sctp_gso_segment() will be called in skb_udp_tunnel_segment(), we need to set transport_header to sctp header. As all the current HWs can't handle both crc checksum and udp checksum at the same time, the crc checksum has to be done in sctp_gso_segment() by removing the NETIF_F_SCTP_CRC flag from the features. Meanwhile, if the HW can't do udp checksum, csum and csum_start has to be set correctly, and udp checksum will be done in __skb_udp_tunnel_segment() by calling gso_make_checksum(). Thanks to Paolo, Marcelo and Guillaume for helping with this one. v1->v2: - no change. v2->v3: - remove the he NETIF_F_SCTP_CRC flag from the features. - set csum and csum_start in sctp_gso_make_checksum(). Signed-off-by: Xin Long --- net/ipv4/udp_offload.c | 3 +++ net/sctp/offload.c | 6 +++++- 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c index e67a66f..4d31255 100644 --- a/net/ipv4/udp_offload.c +++ b/net/ipv4/udp_offload.c @@ -49,6 +49,7 @@ static struct sk_buff *__skb_udp_tunnel_segment(struct sk_buff *skb, __skb_pull(skb, tnl_hlen); skb_reset_mac_header(skb); skb_set_network_header(skb, skb_inner_network_offset(skb)); + skb_set_transport_header(skb, skb_inner_transport_offset(skb)); skb->mac_len = skb_inner_network_offset(skb); skb->protocol = new_protocol; @@ -67,6 +68,8 @@ static struct sk_buff *__skb_udp_tunnel_segment(struct sk_buff *skb, (NETIF_F_HW_CSUM | NETIF_F_IP_CSUM)))); features &= skb->dev->hw_enc_features; + /* CRC checksum can't be handled by HW when it's a udp tunneling packet. */ + features &= ~NETIF_F_SCTP_CRC; /* The only checksum offload we care about from here on out is the * outer one so strip the existing checksum feature flags and diff --git a/net/sctp/offload.c b/net/sctp/offload.c index 74847d6..9f6f818 100644 --- a/net/sctp/offload.c +++ b/net/sctp/offload.c @@ -27,7 +27,11 @@ static __le32 sctp_gso_make_checksum(struct sk_buff *skb) { skb->ip_summed = CHECKSUM_NONE; skb->csum_not_inet = 0; - gso_reset_checksum(skb, ~0); + /* csum and csum_start in gso cb may be needed to do the udp + * checksum when it's a udp tunneling packet. + */ + SKB_GSO_CB(skb)->csum = (__force __wsum)~0; + SKB_GSO_CB(skb)->csum_start = skb_headroom(skb) + skb->len; return sctp_compute_cksum(skb, skb_transport_offset(skb)); }