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Feb 2020 08:51:17 +0000 To: Ferruh Yigit , Neil Horman , John McNamara , "Marko Kovacevic" CC: , Thomas Monjalon , Bruce Richardson , Akhil Goyal , "Konstantin Ananyev" , David Marchand , Jerin Jacob , Ori Kam References: <20200130142003.2645765-1-ferruh.yigit@intel.com> <0fef6f04-1712-b502-245c-17986c604039@intel.com> From: Andrew Rybchenko Autocrypt: addr=arybchenko@solarflare.com; keydata= mQINBF2681gBEACbdTxu8eLL3UX2oAelsnK9GkeaJeUYSOHPJQpV7RL/iaIskqTwBRnhjXt7 j9UEwGA+omnOmqQMpeQTb/F9Ma2dYE+Hw4/t/1KVjxr3ehFaASvwR4fWJfO4e2l/Rk4rG6Yi 5r6CWU2y8su2654Fr8KFc+cMGOAgKoZTZHZsRy5lHpMlemeF+VZkv8L5sYJWPnsypgqlCG3h v6lbtfZs+QqYbFH6bqoZwBAl5irmxywGR7ZJr1GLUZZ1lfdazSY8r6Vz0/Ip/KVxGu2uxo81 QCsAj0ZsQtwji9Sds/prTiPrIjx8Fc/tfbnAuVuPcnPbczwCJACzQr4q26XATL3kVuZhSBWh 4XfO/EAUuEq5AemUG5DDTM87g7Lp4eT9gMZB6P+rJwWPNWTiV3L7Cn+fO+l9mTPnOqdzBgDe OaulKiNSft1o0DY4bGzOmM2ad2cZt0jfnbMPMTE9zsr6+RFa+M8Ct20o6U1MUE4vP6veErMK of4kZ8PdoMM+Sq1hxMPNtlcVBSP9xMmdSZPlfDYI5VWosOceEcz7XZdjBJKdwKuz70V7eac4 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+0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <0fef6f04-1712-b502-245c-17986c604039@intel.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Content-Language: en-US X-Originating-IP: [10.17.10.39] X-ClientProxiedBy: ocex03.SolarFlarecom.com (10.20.40.36) To ukex01.SolarFlarecom.com (10.17.10.4) X-TM-AS-Product-Ver: SMEX-12.5.0.1300-8.5.1020-25250.003 X-TM-AS-Result: No-12.883100-8.000000-10 X-TMASE-MatchedRID: X4bcv0S75Klr2bIFd4uhtPZvT2zYoYOwC/ExpXrHizzNWDA/tkxh/wzK IlW5ZSzaPPQTUWpYTJvlmB3fkLhdbNRvOtA3xA1JPaBTJyy84wULKPaBHScRdQdkFovAReUoilv Ab18i4hPILeYRiwlhPszVnE1oQDqo8pKIoUEViCHZulfZck3CoVeOOwzb8N/Gy5JfHvVu9IvUZZ so3zLrr5kv9kxgZhCxT5KzCCGtFVShdhOr/xScIczSKGx9g8xhWw/S0HB7eoM8oKN7U3f2sa1uN fgQaqvvNaGMtJSpRr11Pzj106GF2Mf2eXl6VFIUC/N7ukLndIDXof+XRfBH2yLT+St7cam6nyxg j7PVNzrgfJZna/5cC1dbqAzxizwITX7PJ/OU3vKDGx/OQ1GV8v5Wag1cn/wU1GcRAJRT6POOhzO a6g8KrT18o4csYLMp++v/nqKL8ChGXpUG1J8Fx9ykTTyi1etaUFFlJ9/XQfY= X-TM-AS-User-Approved-Sender: Yes X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--12.883100-8.000000 X-TMASE-Version: SMEX-12.5.0.1300-8.5.1020-25250.003 X-MDID: 1582534291-F0XA3zag6vNv Subject: Re: [dpdk-dev] [PATCH] doc: deprecate using MAX values as array size X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 2/21/20 1:25 PM, Ferruh Yigit wrote: > On 1/30/2020 2:20 PM, Ferruh Yigit wrote: >> Adding the deprecation notice as reminder for next ABI breakage release >> (20.11). >> This one time breakage is required to be able to extend enum/define >> without breaking ABI. >> >> Signed-off-by: Ferruh Yigit >> --- >> doc/guides/rel_notes/deprecation.rst | 14 ++++++++++++++ >> 1 file changed, 14 insertions(+) >> >> diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst >> index dfcca87ab..99d81564a 100644 >> --- a/doc/guides/rel_notes/deprecation.rst >> +++ b/doc/guides/rel_notes/deprecation.rst >> @@ -38,6 +38,20 @@ Deprecation Notices >> remove it from the externally visible ABI and allow it to be updated in the >> future. >> >> +* lib: will fix extending some enum/define breaking the ABI. There are multiple >> + samples in DPDK that enum/define terminated with a ``.*MAX.*`` value which is >> + used by iterators, and arrays holding these values are sized with this >> + ``.*MAX.*`` value. So extending this enum/define increases the ``.*MAX.*`` >> + value which increases the size of the array and depending on how/where the >> + array is used this may break the ABI. >> + ``RTE_ETH_FLOW_MAX`` is one sample of the mentioned case, adding a new flow >> + type will break the ABI because of ``flex_mask[RTE_ETH_FLOW_MAX]`` array >> + usage in following public struct hierarchy: >> + ``rte_eth_fdir_flex_conf -> rte_fdir_conf -> rte_eth_conf (in the middle)``. >> + Need to identify this kind of usages and fix in 20.11, otherwise this blocks >> + us extending existing enum/define. >> + One solution can be using a fixed size array instead of ``.*MAX.*`` value. >> + >> * dpaa2: removal of ``rte_dpaa2_memsegs`` structure which has been replaced >> by a pa-va search library. This structure was earlier being used for holding >> memory segments used by dpaa2 driver for faster pa->va translation. This >> > Reminder of this deprecation notice. Acked-by: Andrew Rybchenko