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07:16:59 +0000 To: Chas Williams <3chas3@gmail.com>, Ferruh Yigit , Chas Williams CC: , , Declan Doherty References: <1574154221-8628-1-git-send-email-arybchenko@solarflare.com> <873a52fd-7108-5428-1ce1-1bb82c023bb0@intel.com> <79c1f419-524c-a4d2-c97f-39789afe4d8a@solarflare.com> <656592a0-bc73-51d0-7ecc-996d027e7d42@gmail.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/68.2.2 MIME-Version: 1.0 In-Reply-To: <656592a0-bc73-51d0-7ecc-996d027e7d42@gmail.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-12.5.0.1300-8.5.1010-25092.003 X-TM-AS-Result: No-3.326500-8.000000-10 X-TMASE-MatchedRID: 6lay9u8oTUPmLzc6AOD8DfHkpkyUphL9Wt0oPygerN1SMUnCl2ZytD7F nCrEJ7NN7T7/ryviZZ1PTO2RHPnaI8KfN8lhf0yuqJSK+HSPY+/pVMb1xnESMgdkFovAReUogK6 qCGa1Z9dizDHYXsjKMiJ1igIe5xA1UanpLPx8+Soc9jA4mLo8uQ/o5bNHEsCTfE7unL5EELyhPT x3lW8C2YP69u3U5O/3k77j4nUrfkCwoGduGry7icEvKlG0CjjI+yx8oDl9BLxKDy5+nmfdPoi6y FTH7VfQeSCmxO8C4NXjpCo1bCzvK5l8gRSYiEOO4h8r8l3l4ebMMe1W2YBpiiuGKh4AkqKVWyRx gP0YDasX0alYW/pXesdFP9fRoLVtQd6ggaZlaf4ylU6xjA3vw5yqUJ2uHKFAUx4Up3qvMKfQ0FG zFmFsYufOVcxjDhcwAYt5KiTiutmJhnKtQtAvVsRB0bsfrpPInxMyeYT53Rn7AWMMyDJh+snPEF q0/Bv9GendtNh7HWhpnyaZlNjoU+7eqKWbnGhYcTIqD3Yt/sUkVl95AzCx8jnRt2SF9fG1cLqLa 8I49lrUNewp4E2/TgSpmVYGQlZ3sxk1kV1Ja8cbbCVMcs1jUlZca9RSYo/b X-TM-AS-User-Approved-Sender: Yes X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--3.326500-8.000000 X-TMASE-Version: SMEX-12.5.0.1300-8.5.1010-25092.003 X-MDID: 1575875827-zhclEzcQFJwT Subject: Re: [dpdk-dev] [dpdk-stable] [PATCH] net/bonding: do not inherit slave device configuration 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 12/8/19 6:44 PM, Chas Williams wrote: > On 2019-11-19 07:40, Andrew Rybchenko wrote: >> On 11/19/19 3:18 PM, Ferruh Yigit wrote: >>> On 11/19/2019 9:03 AM, Andrew Rybchenko wrote: >>>> Bonding device should control bonded devices configuration. >>>> >>>> Also avoid usage of slave's data->dev_conf. >>>> >>>> Fixes: 2efb58cbab6e ("bond: new link bonding library") >>>> Cc: stable@dpdk.org >>>> >>>> Signed-off-by: Andrew Rybchenko >>>> --- >>>>   drivers/net/bonding/rte_eth_bond_pmd.c | 24 ++++++++++++------------ >>>>   1 file changed, 12 insertions(+), 12 deletions(-) >>>> >>>> diff --git a/drivers/net/bonding/rte_eth_bond_pmd.c > b/drivers/net/bonding/rte_eth_bond_pmd.c >>>> index 707a0f3cdd..4f0e83205d 100644 >>>> --- a/drivers/net/bonding/rte_eth_bond_pmd.c >>>> +++ b/drivers/net/bonding/rte_eth_bond_pmd.c >>>> @@ -1679,6 +1679,7 @@ int >>>>   slave_configure(struct rte_eth_dev *bonded_eth_dev, >>>>           struct rte_eth_dev *slave_eth_dev) >>>>   { >>>> +    struct rte_eth_conf dev_conf; >>>>       struct bond_rx_queue *bd_rx_q; >>>>       struct bond_tx_queue *bd_tx_q; >>>>       uint16_t nb_rx_queues; >>>> @@ -1693,34 +1694,34 @@ slave_configure(struct rte_eth_dev > *bonded_eth_dev, >>>>       /* Stop slave */ >>>>       rte_eth_dev_stop(slave_eth_dev->data->port_id); >>>> >>>> +    memset(&dev_conf, 0, sizeof(dev_conf)); >>>> + >>>>       /* Enable interrupts on slave device if supported */ >>>>       if (slave_eth_dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC) >>>> -        slave_eth_dev->data->dev_conf.intr_conf.lsc = 1; >>>> +        dev_conf.intr_conf.lsc = 1; >>> I assume the original intention is making incremental changes to the > existing >>> slave configuration, if so we should copy the > 'slave_eth_dev->data->dev_conf' to >>> 'dev_conf' before start updating it. >> >> The problem is that I don't understand how incremental changes >> happen. It simply looks wrong or I don't understand something. >> It looks like it is the only place in bonding where slave configuration >> is done. >> > > I understand your confusion. Yes, it certainly looks like > slave_configure() is doing things wrong by directly modifying the slave's > data->dev_conf. If rte_eth_dev_configure() fails, the changes made do > get rolled back and become visible anyway despite the device having > failed to meet that configuration. rte_eth_dev_configure() handles the > rollback, but can't do anything in this case because it doesn't know > the device was directly modified. > > You should make a copy of the dev_conf instead of starting from scratch. > There are other capabilities in there that bonding doesn't care about > but the application might. May application configure slave device directly (e.g. before adding in bond) and bonding should respect it? Are there usecases behind? Of course, if an application configures both slaves directly and via bonding device, it could understand the configuration, but it looks very error-prone and over-complicated. Wouldn't it be better if bonding device configuration is passed to slaves? May be the reason behind is that net/bonding does not forward configuration to slaves except RSS configuration right now. Is the behaviour documented anywhere? Of course, any changes in the area would be behaviour change which should be documented in release notes at least or even go through deprecation process.