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{
    "id": 352,
    "url": "https://patches.dpdk.org/api/patches/352/?format=api",
    "web_url": "https://patches.dpdk.org/patch/352/",
    "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"
    },
    "msgid": "<1410441347-22840-12-git-send-email-bruce.richardson@intel.com>",
    "date": "2014-09-11T13:15:45",
    "name": "[dpdk-dev,v2,11/13] mbuf: move l2_len and l3_len to second cache line",
    "commit_ref": "",
    "pull_url": "",
    "state": "accepted",
    "archived": true,
    "hash": "37ba4a46a1e33c00debc5561f450fa0b0a86a8b3",
    "submitter": {
        "id": 20,
        "url": "https://patches.dpdk.org/api/people/20/?format=api",
        "name": "Bruce Richardson",
        "email": "bruce.richardson@intel.com"
    },
    "delegate": null,
    "mbox": "https://patches.dpdk.org/patch/352/mbox/",
    "series": [],
    "comments": "https://patches.dpdk.org/api/patches/352/comments/",
    "check": "pending",
    "checks": "https://patches.dpdk.org/api/patches/352/checks/",
    "tags": {},
    "headers": {
        "List-Archive": "<http://dpdk.org/ml/archives/dev/>",
        "Return-Path": "<dev-bounces@dpdk.org>",
        "Message-Id": "<1410441347-22840-12-git-send-email-bruce.richardson@intel.com>",
        "X-Mailer": "git-send-email 1.7.4.1",
        "To": "dev@dpdk.org",
        "List-Subscribe": "<http://dpdk.org/ml/listinfo/dev>,\r\n\t<mailto:dev-request@dpdk.org?subject=subscribe>",
        "Received": [
            "from [92.243.14.124] (localhost [IPv6:::1])\r\n\tby dpdk.org (Postfix) with ESMTP id AA268B3C4;\r\n\tThu, 11 Sep 2014 15:11:37 +0200 (CEST)",
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            "from sivswdev02.ir.intel.com (localhost [127.0.0.1])\r\n\tby sivswdev02.ir.intel.com with ESMTP id s8BDFn9o023682;\r\n\tThu, 11 Sep 2014 14:15:49 +0100",
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        ],
        "X-BeenThere": "dev@dpdk.org",
        "List-Unsubscribe": "<http://dpdk.org/ml/options/dev>,\r\n\t<mailto:dev-request@dpdk.org?subject=unsubscribe>",
        "Subject": "[dpdk-dev] [PATCH v2 11/13] mbuf: move l2_len and l3_len to second\r\n\tcache line",
        "In-Reply-To": "<1410441347-22840-1-git-send-email-bruce.richardson@intel.com>",
        "List-Id": "patches and discussions about DPDK <dev.dpdk.org>",
        "List-Post": "<mailto:dev@dpdk.org>",
        "Date": "Thu, 11 Sep 2014 14:15:45 +0100",
        "X-ExtLoop1": "1",
        "Precedence": "list",
        "From": "Bruce Richardson <bruce.richardson@intel.com>",
        "X-IronPort-AV": "E=Sophos;i=\"5.04,505,1406617200\"; d=\"scan'208\";a=\"598051486\"",
        "References": "<1409759378-10113-1-git-send-email-bruce.richardson@intel.com>\r\n\t<1410441347-22840-1-git-send-email-bruce.richardson@intel.com>",
        "X-Original-To": "patchwork@dpdk.org",
        "Sender": "\"dev\" <dev-bounces@dpdk.org>",
        "Errors-To": "dev-bounces@dpdk.org",
        "List-Help": "<mailto:dev-request@dpdk.org?subject=help>",
        "Delivered-To": "patchwork@dpdk.org",
        "X-Mailman-Version": "2.1.15"
    },
    "content": "The l2_len and l3_len fields are used for TX offloads and so should be\nput on the second cache line, along with the other fields only used on\nTX.\n\nUpdates in V2:\n* The l2 and l3 lengths can be accessed as a single uint16_t for\n  performance, as well as individually.\n\nSigned-off-by: Bruce Richardson <bruce.richardson@intel.com>\n---\n lib/librte_mbuf/rte_mbuf.h | 16 +++++++++-------\n 1 file changed, 9 insertions(+), 7 deletions(-)",
    "diff": "diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h\r\nindex 508021b..1c6e115 100644\r\n--- a/lib/librte_mbuf/rte_mbuf.h\r\n+++ b/lib/librte_mbuf/rte_mbuf.h\r\n@@ -159,13 +159,7 @@ struct rte_mbuf {\r\n \tuint16_t reserved2;       /**< Unused field. Required for padding */\r\n \tuint16_t data_len;        /**< Amount of data in segment buffer. */\r\n \tuint32_t pkt_len;         /**< Total pkt len: sum of all segments. */\r\n-\tunion {\r\n-\t\tuint16_t l2_l3_len; /**< combined l2/l3 lengths as single var */\r\n-\t\tstruct {\r\n-\t\t\tuint16_t l3_len:9;      /**< L3 (IP) Header Length. */\r\n-\t\t\tuint16_t l2_len:7;      /**< L2 (MAC) Header Length. */\r\n-\t\t};\r\n-\t};\r\n+\tuint16_t reserved;\r\n \tuint16_t vlan_tci;        /**< VLAN Tag Control Identifier (CPU order) */\r\n \tunion {\r\n \t\tuint32_t rss;     /**< RSS hash result if RSS enabled */\r\n@@ -181,6 +175,14 @@ struct rte_mbuf {\r\n \tstruct rte_mempool *pool; /**< Pool from which mbuf was allocated. */\r\n \tstruct rte_mbuf *next;    /**< Next segment of scattered packet. */\r\n \r\n+\t/* fields to support TX offloads */\r\n+\tunion {\r\n+\t\tuint16_t l2_l3_len; /**< combined l2/l3 lengths as single var */\r\n+\t\tstruct {\r\n+\t\t\tuint16_t l3_len:9;      /**< L3 (IP) Header Length. */\r\n+\t\t\tuint16_t l2_len:7;      /**< L2 (MAC) Header Length. */\r\n+\t\t};\r\n+\t};\r\n } __rte_cache_aligned;\r\n \r\n /**\r\n",
    "prefixes": [
        "dpdk-dev",
        "v2",
        "11/13"
    ]
}