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Nov 2019 13:59:33 +0000 To: Ferruh Yigit , Thomas Monjalon CC: , References: <1574151770-25925-1-git-send-email-arybchenko@solarflare.com> <92cd3fb9-ae97-37cc-79ec-8b01e341504a@intel.com> <34e94334-931f-cd89-dc76-ce3a73f34b1a@solarflare.com> <5b6b6959-bc26-9cbe-2a72-f3e07b9b1c0b@intel.com> From: Andrew Rybchenko Openpgp: preference=signencrypt 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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<31b74c33-bdb6-3b4c-e6e4-b46c059aae92@solarflare.com> Date: Tue, 19 Nov 2019 16:59:29 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <5b6b6959-bc26-9cbe-2a72-f3e07b9b1c0b@intel.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Content-Language: en-GB X-Originating-IP: [91.220.146.112] X-ClientProxiedBy: ocex03.SolarFlarecom.com (10.20.40.36) To ukex01.SolarFlarecom.com (10.17.10.4) X-TM-AS-Product-Ver: SMEX-12.5.0.1300-8.5.1010-25052.003 X-TM-AS-Result: No-12.925200-8.000000-10 X-TMASE-MatchedRID: ZFzIhWOuIzvmLzc6AOD8DfHkpkyUphL92zgw5RT/BrYhg/had72R1OSZ sOHi07gEeCbFg/ja92gEAMtyscj98deQCip1RHVUoxjrap5AGQtVogWRsEaR/sz/SxKo9mJ4bhF mrkG9+jPrh8E2or8k5tuYfgI/CeEBLEsdSh2aJpTiHyvyXeXh5i+w46aA6jWZuM5RdaZDc5bDhg I4nyd1hvCyD6Obi7IeOjkArWCWTZXQy+lsshTJ7iiWKOSuD9akWt0oPygerN0k1SrS1we7ReGvL Y3BNJcclNec8uhHiF3EiWaNVXpRKhKRdQW2L01mqJSK+HSPY+8HuUxnhixmTy/h9VOvT6Agb/rY ol6KtTWamFeyh0mTuPYEY66YFlO6nPiiB8gNJltIcJTn2HkqsczzMs2dyeyV68SGaJUiby33muL h+GPYbyYWtiS5pVFH4j+LsJDOt2oEaNToh7sIaqbtlVLKF4zpysUXICfw1G0PyQfrTcMk4BR2EP 9gbisbRjuuru99Q9KPQi9XuOWoOCnqwKmU0oYz5venhychcY19LQinZ4QefL6qvLNjDYTwsuf7R WbvUtwa5rUAhyFDUAtuKBGekqUpI/NGWt0UYPBJI011CXa1K9kz4I9VjpgvvRViOMlFCYOUiupn NK0oDUIb4fU9zdME X-TM-AS-User-Approved-Sender: Yes X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--12.925200-8.000000 X-TMASE-Version: SMEX-12.5.0.1300-8.5.1010-25052.003 X-MDID: 1574171988-YhbkSpqBlirT Subject: Re: [dpdk-stable] [PATCH] ethdev: avoid undefined behaviour on configuration copying X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: stable-bounces@dpdk.org Sender: "stable" On 11/19/19 4:37 PM, Ferruh Yigit wrote: > On 11/19/2019 1:19 PM, Ferruh Yigit wrote: >> On 11/19/2019 12:36 PM, Andrew Rybchenko wrote: >>> On 11/19/19 3:24 PM, Ferruh Yigit wrote: >>>> On 11/19/2019 8:22 AM, Andrew Rybchenko wrote: >>>>> memcpy() source and destination areas must not overlap and equal >>>>> pointers is the case which is really met, so handle it. >>>> Agree providing same config as input can cause problem with current >>>> implementation, but it is the limitation of the memcpy, the API doesn't request >>>> this. >>>> >>>> We can fix as you suggested, in this case we should document this in API >>>> documentation I think, >>> Basically the patch solves it and there is nothing to document. >>> If pointers are equal there is nothing to do, no copying required. >> You are right, scratch my comment. I overlooked as just overlapping memory issue. >> >>>> we can also solve this by updating the implementation to let this, using an >>>> interim buffer in the simplest measure, not sure which one is better. >>> I don't think that interim buffer is required, 'if' perfectly does the job. >>> >>>> Any practical reason to prevent this other than 'memcpy' limitation? >>> Nothing except application should not play with dev->data, >> +1. >> Bonding PMD though not exactly an application, not sure to let or not it to >> update 'dev->data' >> >>> but I'm not sure if it is the right place to forbid it. >>> >>> Alternative solution is to fix bonding and return error if dev_conf is >>> equal to &dev->data->dev_conf since usecase is unclear and callers >>> should not use dev->data. >>> >>>>> Fixes: 68b931bff287 ("ethdev: eliminate interim variable") >>>>> Cc: stable@dpdk.org >>>>> >>>>> Signed-off-by: Andrew Rybchenko >>>>> --- >>>>> slave_configure() in drivers/net/bonding calls rte_eth_dev_configure() >>>>> with &slave_eth_dev->data->dev_conf. >>>>> >>>>> Alternative solution is to fix bonding and return error if dev_conf is >>>>> equal to &dev->data->dev_conf since usecase is unclear and callers >>>>> should not use dev->data. > Right now each application should have a copy of each port config in > application, and as we discussed before there is a chance that the application > copy and the PMD copy can diverge here or there. > > What do you think having an API to get a copy/clone of the config from the PMD, > later we can introduce the check you mentioned above, use case becomes: > - Get the config from PMD > - Update it > - Configure PMD back with it > > This can prevent both application keeping copy and application updating config > directly. Does it make sense? Yes, it makes sense for me. It will allow testpmd to show actual configuration from PMD point of view. Update and configure back approach has obvious problems with configuration items interdependencies, but it should be the application headache if it chooses the way since nothing forces application to do so. >>>>> lib/librte_ethdev/rte_ethdev.c | 4 +++- >>>>> 1 file changed, 3 insertions(+), 1 deletion(-) >>>>> >>>>> diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c >>>>> index 8f48e8d659..8d2ce31a81 100644 >>>>> --- a/lib/librte_ethdev/rte_ethdev.c >>>>> +++ b/lib/librte_ethdev/rte_ethdev.c >>>>> @@ -1245,7 +1245,9 @@ rte_eth_dev_configure(uint16_t port_id, uint16_t nb_rx_q, uint16_t nb_tx_q, >>>>> * Copy the dev_conf parameter into the dev structure. >>>>> * rte_eth_dev_info_get() requires dev_conf, copy it before dev_info get >>>>> */ >>>>> - memcpy(&dev->data->dev_conf, dev_conf, sizeof(dev->data->dev_conf)); >>>>> + if (dev_conf != &dev->data->dev_conf) >>>>> + memcpy(&dev->data->dev_conf, dev_conf, >>>>> + sizeof(dev->data->dev_conf)); >>>>> >>>>> ret = rte_eth_dev_info_get(port_id, &dev_info); >>>>> if (ret != 0) >>>>>