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[
    {
        "id": 96485,
        "web_url": "http://patches.dpdk.org/comment/96485/",
        "msgid": "<b9f807fb-73d2-31c8-c36c-c1d3c58d00e8@ashroe.eu>",
        "date": "2019-05-28T14:01:27",
        "subject": "Re: [dpdk-dev] [PATCH 0/2] Add ABI Version Testing to app/test",
        "submitter": {
            "id": 1310,
            "url": "http://patches.dpdk.org/api/people/1310/",
            "name": "Ray Kinsella",
            "email": "mdr@ashroe.eu"
        },
        "content": "Someone kindly approved it, and saved me sending it again from the right\nemail a/c, thank you.\n\nOn 28/05/2019 13:08, Bruce Richardson wrote:\n> On Tue, May 28, 2019 at 12:51:56PM +0100, Ray Kinsella wrote:\n>> This patchset adds ABI Version Testing functionality to the app/test unit\n>> test framework.\n>>\n>> The patchset is intended to address two issues previously raised during ML\n>> conversations on ABI Stability;\n>> 1. How do we unit test still supported previous ABI Versions.\n>> 2. How to we unit test inline functions from still supported previous ABI\n>> Versions.\n>>\n>> The more obvious way to achieve both of the above is to simply archive\n>> pre-built binaries compiled against previous versions of DPDK for use unit\n>> testing previous ABI Versions, and while this should still be done as an\n>> additional check, this approach does not scale well, must every DPDK\n>> developer have a local copy of these binaries to test with, before\n>> upstreaming changes?\n>>\n>> Instead starting with rte_lpm, I did the following:-\n>>\n>> * I reproduced mostly unmodified unit tests from previous ABI Versions,\n>>   in this case v2.0 and v16.04\n>> * I reproduced the rte_lpm interface header from these previous ABI\n>>   Versions,including the inline functions and remapping symbols to\n>>   appropriate versions.\n>> * I added support for multiple abi versions to the app/test unit test\n>>   framework to allow users to switch between abi versions (set_abi_version),\n>>   without further polluting the already long list of unit tests available in\n>>   app/test.\n>>\n>> The intention here is that, in future as developers need to depreciate\n>> APIs, their associated unit tests may move into the ABI Version testing\n>> mechanism of the app/test instead of being replaced by the latest set of\n>> unit tests as would be the case today.\n>>\n>> ToDo:\n>> * Refactor the v2.0 and v16.04 unit tests to separate functional and\n>>   performance test cases.\n>> * Add support for trigger ABI Version unit tests from the app/test command\n>>   line.\n>>\n> While I admire the goal, given the amount of code that seems to be involved\n> here, I'm not sure if the \"test\" binary is the place to put this. I think\n> it might be better as a separate ABI compatiblity test app.\n\nI did think about that also - the test binary, similar to testpmd is\nvery busy. I sought to mitigate that with set_abi_version command,\nmitigating unit test name collisions etc.\n\nI would have a huge concern about putting it into a separate binary, as\nthese tcs would quickly become forgotten about.\n\n> \n> A separate question is whether this is really necessary to ensure ABI\n> compatibility? \n\nI would argue that we currently have no idea if ABI versioned functions\nactually work? Why offer backward compatibility, if we don't test it?\n\n> Do other projects do this? \n\nThe C++ stdlib is many ways similar to DPDK, ABI compatibility is a well\nunderstood problem over there. See the following presentation Slide 20.\n\nhttps://accu.org/content/conf2015/JonathanWakely-What%20Is%20An%20ABI%20And%20Why%20Is%20It%20So%20Complicated.pdf\n\nThey have a small corpus of TC's for this\n\nhttps://github.com/gcc-mirror/gcc/tree/master/libstdc%2B%2B-v3/testsuite/[backward,abi]\n\n> Is the info from the abi\n> compatiblity checker script already in DPDK, or from other\n> already-available tools not sufficient?\n\nWell this just tells you that you ABI has changed. We don't have\nanything at the moment that tells us that the ABI compatible functions\nactually work ... ?\n\n> \n> /Bruce\n>",
        "headers": {
            "List-Id": "DPDK patches and discussions <dev.dpdk.org>",
            "From": "Ray Kinsella <mdr@ashroe.eu>",
            "List-Help": "<mailto:dev-request@dpdk.org?subject=help>",
            "Date": "Tue, 28 May 2019 15:01:27 +0100",
            "X-Mailman-Version": "2.1.15",
            "List-Archive": "<http://mails.dpdk.org/archives/dev/>",
            "Delivered-To": "patchwork@dpdk.org",
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            "Cc": "vladimir.medvedkin@intel.com, dev@dpdk.org",
            "To": "Bruce Richardson <bruce.richardson@intel.com>,\n\tRay Kinsella <ray.kinsella@intel.com>",
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            "Subject": "Re: [dpdk-dev] [PATCH 0/2] Add ABI Version Testing to app/test",
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