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Thu, 5 Aug 2021 04:10:24 +0000 Subject: Re: [PATCH v3 0/1] RDMA/rxe: Bump up default maximum values used via uverbs To: Zhu Yanjun Cc: RDMA mailing list References: <20210718225905.58728-1-Rao.Shoaib@oracle.com> <54817f70-e7e5-d145-badf-268ba7533110@oracle.com> <20210727174144.GE543798@ziepe.ca> <6687ea04-c402-1b4e-dce0-386d29948ecc@oracle.com> <20210729195034.GF543798@ziepe.ca> <14b9f35a-0086-834a-c05f-361a26befc13@oracle.com> <90ab34d4-92d1-986d-80e5-4253d208d073@oracle.com> <7a1881c3-4955-5a24-7f90-4d60f2a607a8@oracle.com> From: Shoaib Rao Message-ID: <37d69ea2-ab29-624b-1d02-44890cd078f4@oracle.com> Date: Wed, 4 Aug 2021 21:10:22 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-ClientProxiedBy: SN1PR12CA0098.namprd12.prod.outlook.com (2603:10b6:802:21::33) To SJ0PR10MB4494.namprd10.prod.outlook.com (2603:10b6:a03:2d4::12) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [IPv6:2606:b400:400:7446:8000::8b5] (2606:b400:8301:1010::16aa) by SN1PR12CA0098.namprd12.prod.outlook.com (2603:10b6:802:21::33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4394.16 via Frontend Transport; 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Sometimes crash will occur. >>> >>> It seems that changing maximum values breaks backward compatibility. >>> >>> But without this commit, that is, 5.12-stable <-------> 5.14-rc3, >>> rping can work well. >>> >>> Zhu Yanjun >> I am not sure how you made rxe to work because it did not work for me >> and neither for Bob. Since then, Bob has posted patches for the issue. I >> also posted that my changes work on 5.13.6 kernel. emails attached. >> >> Even if rxe in 5.14 is working for you some how, please apply Bob's >> patches and then mine and test. > I have already applied this commit > https://urldefense.com/v3/__https://patchwork.kernel.org/project/linux-rdma/patch/20210729220039.18549-3-rpearsonhpe@gmail.com/__;!!ACWV5N9M2RV99hQ!b2c47MGvP_kCr0tkQgySPZaB3QX3DMeh4l_iwAS3IQHh9R589oF9BWrcgftcidGA$ . > > And with your commit, rxe can not work well. > > Zhu Yanjun I am not sure how anyone can claim that the code works without my changes. Rxe in Linux 5.14-rc4 is broken due to following change made to rxe_cq_post() and will cause panic or corruption guaranteed. addr = producer_addr(cq->queue, QUEUE_TYPE_TO_CLIENT); It should be addr = producer_addr(cq->queue, QUEUE_TYPE_FROM_CLIENT); The following function also seems wrong > static inline void *producer_addr(struct rxe_queue *q, enum queue_type > type) > { >         u32 prod; > >         switch (type) { >         case QUEUE_TYPE_FROM_CLIENT: >                 /* protect user space index */ >                 prod = smp_load_acquire(&q->buf->producer_index); >                 prod &= q->index_mask; >                 break; >         case QUEUE_TYPE_TO_CLIENT: >                 prod = q->index; >                 break; >         } > >         return q->buf->data + (prod << q->log2_elem_size); > } index should be returned as it is. The code has changed again in v5.14-rc4-22-g251a1524293d, so now I have to try again. Can we please make sure that the code is working after the application of each patch or else it is a moving target. BTW I liked the old code as it distinctly said what was being returned. Shoaib >> Thanks, >> >> Shoaib >> >> >>>> Shoaib >>>> >>>> On 7/29/21 5:34 PM, Shoaib Rao wrote: >>>>> Thanks Bob. >>>>> >>>>> Zhu can you please apply those patches and test. >>>>> >>>>> Shoaib >>>>> >>>>> On 7/29/21 4:08 PM, Pearson, Robert B wrote: >>>>>> I found another rxe bug (for SRQ) and sent three bug fixes in a set >>>>>> including the one you mention. They should all be applied. >>>>>> >>>>>> -----Original Message----- >>>>>> From: Jason Gunthorpe >>>>>> Sent: Thursday, July 29, 2021 2:51 PM >>>>>> To: Shoaib Rao >>>>>> Cc: Zhu Yanjun ; RDMA mailing list >>>>>> >>>>>> Subject: Re: [PATCH v3 0/1] RDMA/rxe: Bump up default maximum values >>>>>> used via uverbs >>>>>> >>>>>> On Thu, Jul 29, 2021 at 12:33:14PM -0700, Shoaib Rao wrote: >>>>>> >>>>>>> Can we please accept my initial patch where I bumped up the values of >>>>>>> a few parameters. We have extensively tested with those values. I will >>>>>>> try to resolve CRC errors and panic and make changes to other >>>>>>> tuneables later? >>>>>> I think Bob posted something for the icrc issues already >>>>>> >>>>>> Please try to work in a sane fashion, rxe shouldn't be left broken >>>>>> with so many people apparently interested in it?? >>>>>> >>>>>> Jason