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{
    "id": 313,
    "url": "http://patches.dpdk.org/api/patches/313/",
    "web_url": "http://patches.dpdk.org/patch/313/",
    "project": {
        "id": 1,
        "url": "http://patches.dpdk.org/api/projects/1/",
        "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": "<1409812499-15656-1-git-send-email-changchun.ouyang@intel.com>",
    "date": "2014-09-04T06:34:59",
    "name": "[dpdk-dev] virtio: Fix vring entry number issue",
    "commit_ref": null,
    "pull_url": null,
    "state": "superseded",
    "archived": true,
    "hash": "df311bdc699d145ee06a236f441cf3b1021c6b2c",
    "submitter": {
        "id": 31,
        "url": "http://patches.dpdk.org/api/people/31/",
        "name": "Ouyang Changchun",
        "email": "changchun.ouyang@intel.com"
    },
    "delegate": null,
    "mbox": "http://patches.dpdk.org/patch/313/mbox/",
    "series": [],
    "comments": "http://patches.dpdk.org/api/patches/313/comments/",
    "check": "pending",
    "checks": "http://patches.dpdk.org/api/patches/313/checks/",
    "tags": {},
    "headers": {
        "Return-Path": "<couyang@shecgisg004.sh.intel.com>",
        "X-BeenThere": "dev@dpdk.org",
        "X-Mailman-Version": "2.1.15",
        "X-IronPort-AV": "E=Sophos;i=\"5.04,464,1406617200\"; d=\"scan'208\";a=\"594370834\"",
        "From": "Ouyang Changchun <changchun.ouyang@intel.com>",
        "List-Archive": "<http://dpdk.org/ml/archives/dev/>",
        "Date": "Thu,  4 Sep 2014 14:34:59 +0800",
        "List-Help": "<mailto:dev-request@dpdk.org?subject=help>",
        "X-ExtLoop1": "1",
        "List-Post": "<mailto:dev@dpdk.org>",
        "List-Subscribe": "<http://dpdk.org/ml/listinfo/dev>,\n\t<mailto:dev-request@dpdk.org?subject=subscribe>",
        "List-Id": "patches and discussions about DPDK <dev.dpdk.org>",
        "X-List-Received-Date": "Thu, 04 Sep 2014 06:30:35 -0000",
        "Precedence": "list",
        "Message-Id": "<1409812499-15656-1-git-send-email-changchun.ouyang@intel.com>",
        "List-Unsubscribe": "<http://dpdk.org/ml/options/dev>,\n\t<mailto:dev-request@dpdk.org?subject=unsubscribe>",
        "Received": [
            "from mga11.intel.com (mga11.intel.com [192.55.52.93])\n\tby dpdk.org (Postfix) with ESMTP id C3E15685B\n\tfor <dev@dpdk.org>; Thu,  4 Sep 2014 08:30:34 +0200 (CEST)",
            "from fmsmga002.fm.intel.com ([10.253.24.26])\n\tby fmsmga102.fm.intel.com with ESMTP; 03 Sep 2014 23:35:13 -0700",
            "from shvmail01.sh.intel.com ([10.239.29.42])\n\tby fmsmga002.fm.intel.com with ESMTP; 03 Sep 2014 23:35:10 -0700",
            "from shecgisg004.sh.intel.com (shecgisg004.sh.intel.com\n\t[10.239.29.89])\n\tby shvmail01.sh.intel.com with ESMTP id s846Z8TB013752;\n\tThu, 4 Sep 2014 14:35:08 +0800",
            "from shecgisg004.sh.intel.com (localhost [127.0.0.1])\n\tby shecgisg004.sh.intel.com (8.13.6/8.13.6/SuSE Linux 0.8) with ESMTP\n\tid s846Z6Fw015759; Thu, 4 Sep 2014 14:35:08 +0800",
            "(from couyang@localhost)\n\tby shecgisg004.sh.intel.com (8.13.6/8.13.6/Submit) id s846Z1vK015755; \n\tThu, 4 Sep 2014 14:35:01 +0800"
        ],
        "X-Mailer": "git-send-email 1.7.0.7",
        "To": "dev@dpdk.org",
        "Subject": "[dpdk-dev] [PATCH] virtio: Fix vring entry number issue"
    },
    "content": "Fix one issue in virtio TX: it needs one more vring entry to hold the virtio header when transmitting packets, it is used later to determine whether to free more entries from used vring.\n\nSigned-off-by: Changchun Ouyang <changchun.ouyang@intel.com>\nReviewed-by: Huawei Xie <huawei.xie@intel.com>\nTested-by: Jingguo Fu <jingguox.fu@intel.com>\n---\n lib/librte_pmd_virtio/virtio_rxtx.c | 3 ++-\n 1 file changed, 2 insertions(+), 1 deletion(-)",
    "diff": "diff --git a/lib/librte_pmd_virtio/virtio_rxtx.c b/lib/librte_pmd_virtio/virtio_rxtx.c\nindex 0b10108..b1c189c 100644\n--- a/lib/librte_pmd_virtio/virtio_rxtx.c\n+++ b/lib/librte_pmd_virtio/virtio_rxtx.c\n@@ -699,7 +699,8 @@ virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)\n \tnum = (uint16_t)(likely(nb_used < VIRTIO_MBUF_BURST_SZ) ? nb_used : VIRTIO_MBUF_BURST_SZ);\n \n \twhile (nb_tx < nb_pkts) {\n-\t\tint need = tx_pkts[nb_tx]->pkt.nb_segs - txvq->vq_free_cnt;\n+\t\t/* Need one more entry for virtio header. */\n+\t\tint need = tx_pkts[nb_tx]->pkt.nb_segs - txvq->vq_free_cnt + 1;\n \t\tint deq_cnt = RTE_MIN(need, (int)num);\n \n \t\tnum -= (deq_cnt > 0) ? deq_cnt : 0;\n",
    "prefixes": [
        "dpdk-dev"
    ]
}