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[
    {
        "id": 94491,
        "web_url": "http://patches.dpdk.org/comment/94491/",
        "msgid": "<6a63d9fa-0634-8184-252e-40e0ff5ce203@intel.com>",
        "date": "2019-04-04T16:13:05",
        "subject": "Re: [dpdk-dev] [PATCH v11 0/1] Introduce AF_XDP PMD",
        "submitter": {
            "id": 324,
            "url": "http://patches.dpdk.org/api/people/324/",
            "name": "Ferruh Yigit",
            "email": "ferruh.yigit@intel.com"
        },
        "content": "On 4/4/2019 9:51 AM, Xiaolong Ye wrote:\n> Overview\n> ========\n> \n> This patchset adds a new PMD driver for AF_XDP which is a proposed\n> faster version of AF_PACKET interface in Linux, see below links [1] [2] for\n> details of AF_XDP introduction:\n> \n> AF_XDP roadmap\n> ==============\n> - AF_XDP is included in upstream kernel since 4.18, and AF_XDP support\n>   in libbpf has been merged in v5.1-rc1.\n> - Now i40e and ixgbe drivers have supported zero copy mode.\n> \n> Change logs\n> ===========\n> v11:\n> \n> - fix the meson build issue\n> \n> v10:\n> \n> - refine the Makefile, remove RTE_KERNELDIR related CFLAGS \n> - add a new internal file af_xdp_deps.h to handle the dependency for\n>   asm/barrier.h\n> - fix a typo observed by Stephen\n> - rename xsk.h to bpf/xsk.h as xsk.h is assumed to be installed in\n>   /usr/local/include/bpf\n> - add libbpf build steps in af_xdp.rst\n> \n> \n> v9:\n> - adjust header files order according to Stephen's suggestion\n> \n> v8:\n> - address Ferruh's comments on V7\n> - replace posix_memalign with rte_memzone_reserve_aligned to get better\n>   performance\n> - keep the first patch only as Oliver suggested as zero copy part\n>   implementation is still in suspense, we may provide the related patch\n>   later.\n> \n> v7:\n> - mention mtu limitation in af_xdp.rst\n> - fix the vdev name in af_xdp.rst\n> \n> V6:\n> \n> - remove the newline in AF_XDP_LOG definition to avoid double new lines\n>   issue.\n> - rename MEMPOOL_F_PAGE_ALIGN to MEMPOOL_CHUNK_F_PAGE_ALIGN.\n> \n> V5:\n> \n> - disable AF_XDP pmd by default due to it requires kernel more recent\n>   than minimum kernel version supported by DPDK\n> - address other review comments of Maxime\n> \n> V4:\n> \n> - change vdev name to net_af_xdp\n> - adopt dynamic log type for all logging\n> - Fix other style issues raised by Stephen\n> \n> V3:\n> \n> - Fix all style issues pointed by Stephen, Mattias, David.\n> - Drop the testpmd change as we'll adopt Jerin's suggestion to add a new\n>   mempool driver to handle the application use of AF_XDP's zero copy feature.\n> \n> V2:\n> - Fix a NULL pointer reference crash issue\n> - Fix txonly stop sending traffic in zc mode\n> - Refactor rte_mbuf.c to avoid ABI breakage.\n> - Fix multiple style issues pointed by Ferruh, David, Stephen, Luca.\n> \n> changes vs RFC sent by Qi last Aug:\n> \n> - Re-work base on AF_XDP's interface changes since the new libbpf has\n>   provided higher-level APIs that hide many of the details of the AP_XDP\n>   uapi. After the rework, it helps to reduce 300+ lines of code.\n> \n> - multi-queues is not supported due to current libbpf doesn't support\n>   multi-sockets on a single umem.\n> \n> - No extra steps to load xdp program manually, since the current behavior of\n>   libbpf would load a default xdp program when user calls xsk_socket__create.\n>   userspace application only needs to handle the cleanup.\n> \n> How to try\n> ==========\n> \n> 1. take the kernel >= v5.1-rc1, build kernel and replace your host\n>    kernel with it.\n>    \n>    make sure you turn on XDP sockets when compiling\n> \n>    Networking support -->\n>         Networking options -->\n>                 [ * ] XDP sockets\n>    \n> 2. build & install libbpf in tools/lib/bpf\n> \n>    cd tools/lib/bpf\n>    make install_lib\n>    make install_headers\n> \n> 3. ethtool -L enp59s0f0 combined 1\n> \n> 4. extra step to build dpdk\n> \n>    explicitly enable AF_XDP pmd by adding below line to\n>    config/common_linux\n> \n>    CONFIG_RTE_LIBRTE_PMD_AF_XDP=y\n> \n> 5. start testpmd\n> \n>    ./build/app/testpmd -c 0xc -n 4 --vdev net_af_xdp,iface=enp59s0f0,queue=0 -- -i --rxq=1 --txq=1\n> \n>     in this case, default xdp program will be loaded and linked to queue 0 of enp59s0f0,\n>     network traffics travel to queue 0 will be redirected to af_xdp socket.\n> \n> Xiaolong Ye (1):\n>   net/af_xdp: introduce AF XDP PMD driver\n\nReviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>",
        "headers": {
            "List-Id": "DPDK patches and discussions <dev.dpdk.org>",
            "From": "Ferruh Yigit <ferruh.yigit@intel.com>",
            "List-Help": "<mailto:dev-request@dpdk.org?subject=help>",
            "Date": "Thu, 4 Apr 2019 17:13:05 +0100",
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            "Cc": "Qi Zhang <qi.z.zhang@intel.com>,\n\tKarlsson Magnus <magnus.karlsson@intel.com>,\n\tTopel Bjorn <bjorn.topel@intel.com>,\n\tMaxime Coquelin <maxime.coquelin@redhat.com>,\n\tBruce Richardson <bruce.richardson@intel.com>,\n\tAnanyev Konstantin <konstantin.ananyev@intel.com>,\n\tDavid Marchand <david.marchand@redhat.com>,\n\tAndrew Rybchenko <arybchenko@solarflare.com>,\n\tOlivier Matz <olivier.matz@6wind.com>",
            "To": "Xiaolong Ye <xiaolong.ye@intel.com>, dev@dpdk.org,\n\tStephen Hemminger <stephen@networkplumber.org>,\n\tLuca Boccassi <bluca@debian.org>",
            "User-Agent": "Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101\n\tThunderbird/60.6.1",
            "References": "<20190301080947.91086-1-xiaolong.ye@intel.com>\n\t<20190404085113.16732-1-xiaolong.ye@intel.com>",
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            "X-Amp-File-Uploaded": "False",
            "Subject": "Re: [dpdk-dev] [PATCH v11 0/1] Introduce AF_XDP PMD",
            "In-Reply-To": "<20190404085113.16732-1-xiaolong.ye@intel.com>",
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]