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Feb 2020 13:13:49 +0000 To: Ferruh Yigit , Ciara Power , , CC: References: <20200218104604.30574-1-ciara.power@intel.com> <4afc537a-0710-7721-0bf5-cc27c6d777f6@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 ITSxgNFCTbeJ03zL2MR5s0IvD9ghISAwZ6ieCjU5UATn5+63qpD0nVNLsAdb/UpfvQcKAmvj 0fKlxu/PMVkjBa7/4cfNogYOhWDKUO+1pMaFwvb6/XTo6uMpfQARAQABtCxBbmRyZXcgUnli 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MIME-Version: 1.0 In-Reply-To: <4afc537a-0710-7721-0bf5-cc27c6d777f6@intel.com> Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 8bit 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-12.5.0.1300-8.5.1020-25238.003 X-TM-AS-Result: No-11.376500-8.000000-10 X-TMASE-MatchedRID: hls5oAVArl/mLzc6AOD8DfHkpkyUphL93V4UShoTXacUFDkgqWz8DmXd BkVbq4VxlpKpNiL4Llp444Vp3HAhxMnBPfJT6kxWZdorcofH/GnLRD51bz5RZPOW/sUTBY7LPfn hVjQEqGWt2gtuWr1LmswlgPRpEXRF0X+0CFhNLNecxB01DrjF9y3Pi/Xo8BzmiiKPXbEds+6qHJ blk0UkDg4DVn51Ob6wGGKxvFKfhb+QwZP6WaAvV2pjhlm7EiBXgE4FBVDR3kPCtB5AXGRY2wjL4 VQFO+0bfS0Ip2eEHnxlgn288nW9INhLmavc54GnjaPj0W1qn0TKayT/BQTiGk4LwtODUGFQ/Uii DGnywfYFATEg2DfgEB7cSGd0DtbE43G7reu71is= X-TM-AS-User-Approved-Sender: Yes X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--11.376500-8.000000 X-TMASE-Version: SMEX-12.5.0.1300-8.5.1020-25238.003 X-MDID: 1582031636-s8V1Tw7qTayA Subject: Re: [dpdk-dev] [PATCH] ethdev: add comment to warn of ABI breakage 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 2/18/20 2:59 PM, Ferruh Yigit wrote: > On 2/18/2020 10:46 AM, Ciara Power wrote: >> If a function is added to the eth_dev_ops struct before >> tx_descriptor_status function, this will cause ABI breakage. This is due >> to static inline functions using this function, and some other functions >> above it in the struct, so they cannot change position. A comment is >> added to inform developers of this possible breakage. >> >> Signed-off-by: Ciara Power >> --- >> lib/librte_ethdev/rte_ethdev_core.h | 3 +++ >> 1 file changed, 3 insertions(+) >> >> diff --git a/lib/librte_ethdev/rte_ethdev_core.h b/lib/librte_ethdev/rte_ethdev_core.h >> index 7bf97e24e..1ad04a129 100644 >> --- a/lib/librte_ethdev/rte_ethdev_core.h >> +++ b/lib/librte_ethdev/rte_ethdev_core.h >> @@ -667,6 +667,9 @@ struct eth_dev_ops { >> /**< Check the status of a Rx descriptor. */ >> eth_tx_descriptor_status_t tx_descriptor_status; >> /**< Check the status of a Tx descriptor. */ >> + /* Static inline functions use functions above this comment. >> + * New dev_ops functions should be added below to avoid breaking ABI. >> + */ >> eth_rx_enable_intr_t rx_queue_intr_enable; /**< Enable Rx queue interrupt. */ >> eth_rx_disable_intr_t rx_queue_intr_disable; /**< Disable Rx queue interrupt. */ >> eth_tx_queue_setup_t tx_queue_setup;/**< Set up device TX queue. */ >> > > Reviewed-by: Ferruh Yigit LGTM, but may I suggest to make the first line in the comment empty to make it easier to notice. I.e. /* * Static inline functions use functions above this comment. * ... */ Or even add empty lines before and after the comment. Reviewed-by: Andrew Rybchenko