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GET /api/patches/1242/?format=api
{ "id": 1242, "url": "https://patches.dpdk.org/api/patches/1242/?format=api", "web_url": "https://patches.dpdk.org/project/dpdk/patch/1415635166-1364-5-git-send-email-olivier.matz@6wind.com/", "project": { "id": 1, "url": "https://patches.dpdk.org/api/projects/1/?format=api", "name": "DPDK", "link_name": "dpdk", "list_id": "dev.dpdk.org", "list_email": "dev@dpdk.org", "web_url": "http://core.dpdk.org", "scm_url": "git://dpdk.org/dpdk", "webscm_url": "http://git.dpdk.org/dpdk", "list_archive_url": "https://inbox.dpdk.org/dev", "list_archive_url_format": "https://inbox.dpdk.org/dev/{}", "commit_url_format": "" }, "msgid": "<1415635166-1364-5-git-send-email-olivier.matz@6wind.com>", "list_archive_url": "https://inbox.dpdk.org/dev/1415635166-1364-5-git-send-email-olivier.matz@6wind.com", "date": "2014-11-10T15:59:18", "name": "[dpdk-dev,04/12] mbuf: add help about TX checksum flags", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": true, "hash": "49483b962168490334a0748680869d11f8200434", "submitter": { "id": 8, "url": "https://patches.dpdk.org/api/people/8/?format=api", "name": "Olivier Matz", "email": "olivier.matz@6wind.com" }, "delegate": null, "mbox": "https://patches.dpdk.org/project/dpdk/patch/1415635166-1364-5-git-send-email-olivier.matz@6wind.com/mbox/", "series": [], "comments": "https://patches.dpdk.org/api/patches/1242/comments/", "check": "pending", "checks": "https://patches.dpdk.org/api/patches/1242/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<dev-bounces@dpdk.org>", "X-Original-To": "patchwork@dpdk.org", "Delivered-To": "patchwork@dpdk.org", "Received": [ "from [92.243.14.124] (localhost [IPv6:::1])\n\tby dpdk.org (Postfix) with ESMTP id 0D8947F71;\n\tMon, 10 Nov 2014 16:50:12 +0100 (CET)", "from mail-wi0-f171.google.com (mail-wi0-f171.google.com\n\t[209.85.212.171]) by dpdk.org (Postfix) with ESMTP id BFCDB7F58\n\tfor <dev@dpdk.org>; Mon, 10 Nov 2014 16:50:06 +0100 (CET)", "by mail-wi0-f171.google.com with SMTP id r20so10933438wiv.10\n\tfor <dev@dpdk.org>; Mon, 10 Nov 2014 07:59:52 -0800 (PST)", "from glumotte.dev.6wind.com (guy78-3-82-239-227-177.fbx.proxad.net.\n\t[82.239.227.177]) by mx.google.com with ESMTPSA id\n\tll2sm10966561wjb.11.2014.11.10.07.59.51 for <multiple recipients>\n\t(version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128);\n\tMon, 10 Nov 2014 07:59:52 -0800 (PST)" ], "X-Google-DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed;\n\td=1e100.net; s=20130820;\n\th=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to\n\t:references;\n\tbh=qvIMZXojNxfkDsroejjkbaBHiMfR7gJn9nJd//Ty6wA=;\n\tb=JqKrNykfxa6OJ+zf1S2gZAGGwQCuwt1HwZw/IAcKvs/Rqr3k8g+mVCAJx+1n7rK7y9\n\tP/oJianHbVJgLpOxbcWlScX9oXUQXiaFwm/dVPoYkJoXmKXyxbvIvLt9XW8/J7d6+VrQ\n\tKwwg47GrvBY8nEIJjeIS6gvUsJiWsw1p8NlyWyP7Gb9vAj+szUTyDRl8UK+p78oKaAi/\n\tnJmxkT0c9oXgPo6zKbFKKQOwPKEveZr0yRfvfIP+dT9ld/8RxeKZjokFqf3KkLvGbIFa\n\tIGvp2zxX9QgZxJMMFBC4Jnc1zHMDN45sCl/WcZ35JG6tQXqxtGQ1rKf5xByWdap8eZja\n\t5z/w==", "X-Gm-Message-State": "ALoCoQksasK20R3+KCsoAEgdTnZXR2AShhXxEgeY0McQvQAQflEuQauDtmlC0hJ2+kOHIWgUEXQy", "X-Received": "by 10.195.12.136 with SMTP id eq8mr42606754wjd.77.1415635192609; \n\tMon, 10 Nov 2014 07:59:52 -0800 (PST)", "From": "Olivier Matz <olivier.matz@6wind.com>", "To": "dev@dpdk.org", "Date": "Mon, 10 Nov 2014 16:59:18 +0100", "Message-Id": "<1415635166-1364-5-git-send-email-olivier.matz@6wind.com>", "X-Mailer": "git-send-email 2.1.0", "In-Reply-To": "<1415635166-1364-1-git-send-email-olivier.matz@6wind.com>", "References": "<1415635166-1364-1-git-send-email-olivier.matz@6wind.com>", "Cc": "jigsaw@gmail.com", "Subject": "[dpdk-dev] [PATCH 04/12] mbuf: add help about TX checksum flags", "X-BeenThere": "dev@dpdk.org", "X-Mailman-Version": "2.1.15", "Precedence": "list", "List-Id": "patches and discussions about DPDK <dev.dpdk.org>", "List-Unsubscribe": "<http://dpdk.org/ml/options/dev>,\n\t<mailto:dev-request@dpdk.org?subject=unsubscribe>", "List-Archive": "<http://dpdk.org/ml/archives/dev/>", "List-Post": "<mailto:dev@dpdk.org>", "List-Help": "<mailto:dev-request@dpdk.org?subject=help>", "List-Subscribe": "<http://dpdk.org/ml/listinfo/dev>,\n\t<mailto:dev-request@dpdk.org?subject=subscribe>", "Errors-To": "dev-bounces@dpdk.org", "Sender": "\"dev\" <dev-bounces@dpdk.org>" }, "content": "Describe how to use hardware checksum API.\n\nSigned-off-by: Olivier Matz <olivier.matz@6wind.com>\n---\n lib/librte_mbuf/rte_mbuf.h | 25 +++++++++++++++++--------\n 1 file changed, 17 insertions(+), 8 deletions(-)", "diff": "diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h\nindex be15168..96e322b 100644\n--- a/lib/librte_mbuf/rte_mbuf.h\n+++ b/lib/librte_mbuf/rte_mbuf.h\n@@ -95,19 +95,28 @@ extern \"C\" {\n #define PKT_RX_TUNNEL_IPV6_HDR (1ULL << 12) /**< RX tunnel packet with IPv6 header. */\n \n #define PKT_TX_VLAN_PKT (1ULL << 55) /**< TX packet is a 802.1q VLAN packet. */\n-#define PKT_TX_IP_CKSUM (1ULL << 54) /**< IP cksum of TX pkt. computed by NIC. */\n+\n+/**\n+ * Enable hardware computation of IP cksum. To use it:\n+ * - fill l2_len and l3_len in mbuf\n+ * - set the flags PKT_TX_IP_CKSUM\n+ * - set the ip checksum to 0 in IP header\n+ */\n+#define PKT_TX_IP_CKSUM (1ULL << 54)\n #define PKT_TX_IPV4_CSUM PKT_TX_IP_CKSUM /**< Alias of PKT_TX_IP_CKSUM. */\n #define PKT_TX_IPV4 PKT_RX_IPV4_HDR /**< IPv4 with no IP checksum offload. */\n #define PKT_TX_IPV6 PKT_RX_IPV6_HDR /**< IPv6 packet */\n \n-/*\n- * Bits 52+53 used for L4 packet type with checksum enabled.\n- * 00: Reserved\n- * 01: TCP checksum\n- * 10: SCTP checksum\n- * 11: UDP checksum\n+/**\n+ * Bits 52+53 used for L4 packet type with checksum enabled: 00: Reserved,\n+ * 01: TCP checksum, 10: SCTP checksum, 11: UDP checksum. To use hardware\n+ * L4 checksum offload, the user needs to:\n+ * - fill l2_len and l3_len in mbuf\n+ * - set the flags PKT_TX_TCP_CKSUM, PKT_TX_SCTP_CKSUM or PKT_TX_UDP_CKSUM\n+ * - calculate the pseudo header checksum and set it in the L4 header (only\n+ * for TCP or UDP). For SCTP, set the crc field to 0.\n */\n-#define PKT_TX_L4_NO_CKSUM (0ULL << 52) /**< Disable L4 cksum of TX pkt. */\n+#define PKT_TX_L4_NO_CKSUM (0ULL << 52) /* Disable L4 cksum of TX pkt. */\n #define PKT_TX_TCP_CKSUM (1ULL << 52) /**< TCP cksum of TX pkt. computed by NIC. */\n #define PKT_TX_SCTP_CKSUM (2ULL << 52) /**< SCTP cksum of TX pkt. computed by NIC. */\n #define PKT_TX_UDP_CKSUM (3ULL << 52) /**< UDP cksum of TX pkt. computed by NIC. */\n", "prefixes": [ "dpdk-dev", "04/12" ] }