Patch Detail

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{
    "id": 27119,
    "url": "http://patches.dpdk.org/api/patches/27119/?format=api",
    "web_url": "http://patches.dpdk.org/project/dpdk/patch/20170724084004.25542-2-santosh.shukla@caviumnetworks.com/",
    "project": {
        "id": 1,
        "url": "http://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": "<20170724084004.25542-2-santosh.shukla@caviumnetworks.com>",
    "list_archive_url": "https://inbox.dpdk.org/dev/20170724084004.25542-2-santosh.shukla@caviumnetworks.com",
    "date": "2017-07-24T08:39:53",
    "name": "[dpdk-dev,v5,01/12] eal/pci: introduce PCI driver iova as va flag",
    "commit_ref": null,
    "pull_url": null,
    "state": "superseded",
    "archived": true,
    "hash": "5ec5da57ffce68f95eeb4232c4adde6af0f052d8",
    "submitter": {
        "id": 480,
        "url": "http://patches.dpdk.org/api/people/480/?format=api",
        "name": "Santosh Shukla",
        "email": "santosh.shukla@caviumnetworks.com"
    },
    "delegate": null,
    "mbox": "http://patches.dpdk.org/project/dpdk/patch/20170724084004.25542-2-santosh.shukla@caviumnetworks.com/mbox/",
    "series": [],
    "comments": "http://patches.dpdk.org/api/patches/27119/comments/",
    "check": "success",
    "checks": "http://patches.dpdk.org/api/patches/27119/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 D8A9358CB;\n\tMon, 24 Jul 2017 10:42:07 +0200 (CEST)",
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        ],
        "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed;\n\td=CAVIUMNETWORKS.onmicrosoft.com; s=selector1-cavium-com;\n\th=From:Date:Subject:Message-ID:Content-Type:MIME-Version;\n\tbh=R3S6mwn48WEG8t+Y2l3BTq8h9CilRk9HCJ3gyJZbp+Y=;\n\tb=D0Ae77cHmjhkJ7M3W4SSlDMWt3NI+PjR4Ha0yZwHQvX0xziBipUWcZ5kxXnOGMSZBOvCMJu4dM31p563sa+6HoZfGTxcTNX9DAdnhLq/6xclNg7UGH6SxmhZOG9OFIYbeRNhEHEWNJ1kY4XoRxyErKCvieXIe+aqYeWXoJCJr9E=",
        "Authentication-Results": "spf=none (sender IP is )\n\tsmtp.mailfrom=Santosh.Shukla@cavium.com; ",
        "From": "Santosh Shukla <santosh.shukla@caviumnetworks.com>",
        "To": "thomas@monjalon.net,\n\tdev@dpdk.org",
        "Cc": "hemant.agrawal@nxp.com, bruce.richardson@intel.com,\n\tjerin.jacob@caviumnetworks.com, shreyansh.jain@nxp.com,\n\tgaetan.rivet@6wind.com, sergio.gonzalez.monroy@intel.com,\n\tanatoly.burakov@intel.com, stephen@networkplumber.org,\n\tmaxime.coquelin@redhat.com, olivier.matz@6wind.com,\n\tSantosh Shukla <santosh.shukla@caviumnetworks.com>",
        "Date": "Mon, 24 Jul 2017 14:09:53 +0530",
        "Message-Id": "<20170724084004.25542-2-santosh.shukla@caviumnetworks.com>",
        "X-Mailer": "git-send-email 2.11.0",
        "In-Reply-To": "<20170724084004.25542-1-santosh.shukla@caviumnetworks.com>",
        "References": "<20170718055950.10208-1-santosh.shukla@caviumnetworks.com>\n\t<20170724084004.25542-1-santosh.shukla@caviumnetworks.com>",
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        "Subject": "[dpdk-dev] [PATCH v5 01/12] eal/pci: introduce PCI driver iova as\n\tva flag",
        "X-BeenThere": "dev@dpdk.org",
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        "List-Id": "DPDK patches and discussions <dev.dpdk.org>",
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    },
    "content": "Introducing RTE_PCI_DRV_IOVA_AS_VA flag. Flag used when driver needs\nto operate in iova=va mode.\n\nWhy driver need iova=va mapping?\n\nOn NPU style co-processors like Octeontx, the buffer recycling has been\ndone in HW, unlike SW model. Here is the data flow:\n1) On control path, Fill the HW mempool with buffers(iova as pa address)\n2) on rx_burst, HW gives you IOVA address(iova as pa address)\n3) As application expects VA to operate on it, rx_burst() needs to\nconvert to _va from _pa. Which is very expensive.\nInstead of that if iova as va mapping, we can avoid the cost of\nconverting with help of IOMMU/SMMU.\n\nSigned-off-by: Santosh Shukla <santosh.shukla@caviumnetworks.com>\nSigned-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>\nReviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>\n---\nv3 --> v4:\n- Renamed RTE_PCI_DRV_NEED_IOVA_VA to RTE_PCI_DRV_IOVA_AS_VA.\n(Suggested by Maxime)\n\n lib/librte_eal/common/include/rte_pci.h | 2 ++\n 1 file changed, 2 insertions(+)",
    "diff": "diff --git a/lib/librte_eal/common/include/rte_pci.h b/lib/librte_eal/common/include/rte_pci.h\nindex 8b123391c..743392f91 100644\n--- a/lib/librte_eal/common/include/rte_pci.h\n+++ b/lib/librte_eal/common/include/rte_pci.h\n@@ -202,6 +202,8 @@ struct rte_pci_bus {\n #define RTE_PCI_DRV_INTR_RMV 0x0010\n /** Device driver needs to keep mapped resources if unsupported dev detected */\n #define RTE_PCI_DRV_KEEP_MAPPED_RES 0x0020\n+/** Device driver supports iova as va */\n+#define RTE_PCI_DRV_IOVA_AS_VA 0X0040\n \n /**\n  * A structure describing a PCI mapping.\n",
    "prefixes": [
        "dpdk-dev",
        "v5",
        "01/12"
    ]
}