From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <shaklee3@gmail.com>
Received: from mail-vk0-f54.google.com (mail-vk0-f54.google.com
 [209.85.213.54]) by dpdk.org (Postfix) with ESMTP id DB75CADCB
 for <users@dpdk.org>; Thu, 23 Jun 2016 01:37:19 +0200 (CEST)
Received: by mail-vk0-f54.google.com with SMTP id c2so53086954vkg.1
 for <users@dpdk.org>; Wed, 22 Jun 2016 16:37:19 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
 h=mime-version:from:date:message-id:subject:to;
 bh=J3zOKIa0rfal892h3O/wvfcXS52RQjRFlYtPblIWsmI=;
 b=GPeab3bj/TgkHjqlEwKpOQkUBvOlyNicGLKbWc0GweRRwU45ZE4ultMCPszXzLrdNK
 V4Q7JWsFXP0np2YPm43/MZt/te57uat/OFU7D/mNfYVI2B5JU8zufJJT0zf4/vp3EXqO
 Iv5FPutXScwZvJ7+x2aMZtlcD2rQxaK/IN3BRW7ayDanu3uwqpycBIqlNW8NsTRTseGL
 dIfw74MGEYn1cwitxiIAp8xb8+sug3hqEHgCez2oou6hXZQd8EKnGqvQqFZatl3zZTLD
 M1mx+BHyp6tatjzjaVc1+3PN6cZg5DlSE4GDl6g/WuhGz0LOTMv3Ai3cJEY58UrIhE+W
 HNzA==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=1e100.net; s=20130820;
 h=x-gm-message-state:mime-version:from:date:message-id:subject:to;
 bh=J3zOKIa0rfal892h3O/wvfcXS52RQjRFlYtPblIWsmI=;
 b=bSRT7wRtA4WRxU6llr2xNREPFLyPqmJ0Vqfhpf4mZzq1pD0ymSFL/JbhOhZSopX5x9
 +dR+WIXd6Nwv/Z4D0nH+TauYsZrm6/0gVK1lrFt6bSELemxyzoO1jzC8ui6pfKQNOa47
 0OPhN1OxiP7I7Vt5W5AxBlqiHwHc6upCTOMjeuKmPQkgpGOe8Dr6BFIj2Usw8kXALbVh
 Wz6EPqZPV66oHMQ7X8qYt+GAgK+Up2imsiLyRWXRBRSQfC1opvP0yJiTjWqMY0u0kDSf
 AlrAUgDWmhiQUQW1td+AX5ZUMcVo8KvArNAf/f60HqyaKek4drNZLbby1LzjUAkO6axQ
 vdpQ==
X-Gm-Message-State: ALyK8tJetymSyTR8EByIZzqxeaHXE7ADsxcNdvuUjCfHmzNSNEzata42zjW23sPTDHUNsptcERsmtUy1hDZHnQ==
X-Received: by 10.31.224.132 with SMTP id x126mr7533018vkg.39.1466638639128;
 Wed, 22 Jun 2016 16:37:19 -0700 (PDT)
MIME-Version: 1.0
Received: by 10.159.37.183 with HTTP; Wed, 22 Jun 2016 16:37:18 -0700 (PDT)
From: Cliff Burdick <shaklee3@gmail.com>
Date: Wed, 22 Jun 2016 16:37:18 -0700
Message-ID: <CA+Gp1nbrbmFXD49mVkT6rLwzcJUWXXXrPZ0J8GPK5cc-421v-g@mail.gmail.com>
To: users <users@dpdk.org>
Content-Type: text/plain; charset=UTF-8
X-Content-Filtered-By: Mailman/MimeDel 2.1.15
Subject: [dpdk-users] TX UDP Checksum
X-BeenThere: users@dpdk.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: usage discussions <users.dpdk.org>
List-Unsubscribe: <http://dpdk.org/ml/options/users>,
 <mailto:users-request@dpdk.org?subject=unsubscribe>
List-Archive: <http://dpdk.org/ml/archives/users/>
List-Post: <mailto:users@dpdk.org>
List-Help: <mailto:users-request@dpdk.org?subject=help>
List-Subscribe: <http://dpdk.org/ml/listinfo/users>,
 <mailto:users-request@dpdk.org?subject=subscribe>
X-List-Received-Date: Wed, 22 Jun 2016 23:37:20 -0000

Hi, I'm trying to figure out how to get the TX UDP checksum offloading
working on my i40e by using the only example I can find in the csumonly.c
file from testpmd. I have a ethernet + vlan header, followed by 20 bytes of
IP, then UDP + 1000 bytes of my payload. The IP HCS is calculating
correctly using rte_ipv4_cksum(). Here is what I'm currently doing while
setting up the mbuf:

pkt->l2_len = 18;
pkt->l3_len = 20;
pkt->ol_flags = (PKT_TX_UDP_CKSUM);
customMsg *msg = rte_pktmbuf_mtod(pkt, customMsg *);
... Fill in IP headers and all UDP headers
msg->udp.dgram_cksum = 0;
msg->udp.dgram_cksum = rte_ipv4_phdr_cksum(&msg->ip, pkt->ol_flags);

The UDP checksum reported by wireshark is incorrect. Am I on the right
track for offloading this or is there something I'm missing? I'd ideally
like to offload IP onto the card as well, but that was failing too. I was
setting IP in the ol_flags and setting the checksum to 0 as per the example.