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From: Sagi Grimberg <sagi@grimberg.me>
To: Stephen Rust <srust@blockbridge.com>
Cc: Ming Lei <ming.lei@redhat.com>,
	Rob Townley <rob.townley@gmail.com>,
	Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
	linux-block@vger.kernel.org, linux-rdma@vger.kernel.org,
	linux-scsi@vger.kernel.org, martin.petersen@oracle.com,
	target-devel@vger.kernel.org, Doug Ledford <dledford@redhat.com>,
	Jason Gunthorpe <jgg@ziepe.ca>, Max Gurtovoy <maxg@mellanox.com>
Subject: Re: Data corruption in kernel 5.1+ with iSER attached ramdisk
Date: Mon, 30 Mar 2020 18:07:13 -0700	[thread overview]
Message-ID: <82bbbdf2-cf61-d523-29e0-d756b7f208f4@grimberg.me> (raw)
In-Reply-To: <CAAFE1bdAbKfqbf05pKBcMUj+58fijDMT-8WBSuwiKk2Bmm4v2w@mail.gmail.com>


>> Can you try attached patch and see if it solves your issue?
>> WARNING: very lightly tested...
> 
> I have run our tests against this patch and it is working well for our
> "basic" testing as well. The test case that previously failed, now
> passes with this patch. So that's encouraging! Thanks for the quick
> response and quick patch.

Good to know..

> One question we had is regarding the hard coded header length: What
> happens if the initiator sends an extended CDB, like a WRITE32? Are
> there any concerns with an additional header segment (AHS)?

You are absolutely correct! t10-dif is broken with this patch as
32 byte cdb would break into two buffers which is not expected
by the target core...

I take back this patch, I guess we should keep contiguous allocation but
just make the recv wr such that the data is aligned for 16 bytes cdbs,
and for 32-byte cdbs we never support immediate data anyways...

  reply	other threads:[~2020-03-31  1:07 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CAAFE1bd9wuuobpe4VK7Ty175j7mWT+kRmHCNhVD+6R8MWEAqmw@mail.gmail.com>
2019-11-28  1:57 ` Data corruption in kernel 5.1+ with iSER attached ramdisk Ming Lei
     [not found]   ` <CA+VdTb_-CGaPjKUQteKVFSGqDz-5o-tuRRkJYqt8B9iOQypiwQ@mail.gmail.com>
2019-11-28  2:58     ` Ming Lei
     [not found]       ` <CAAFE1bfsXsKGyw7SU_z4NanT+wmtuJT=XejBYbHHMCDQwm73sw@mail.gmail.com>
2019-11-28  4:25         ` Stephen Rust
2019-11-28  5:51           ` Rob Townley
2019-11-28  9:12         ` Ming Lei
2019-12-02 18:42           ` Stephen Rust
2019-12-03  0:58             ` Ming Lei
2019-12-03  3:04               ` Stephen Rust
2019-12-03  3:14                 ` Ming Lei
2019-12-03  3:26                   ` Stephen Rust
2019-12-03  3:50                     ` Stephen Rust
2019-12-03 12:45                       ` Ming Lei
2019-12-03 19:56                         ` Stephen Rust
2019-12-04  1:05                           ` Ming Lei
2019-12-04 17:23                             ` Stephen Rust
2019-12-04 23:02                               ` Ming Lei
2019-12-05  0:16                                 ` Bart Van Assche
2019-12-05 14:44                                   ` Stephen Rust
2019-12-05  2:28                                 ` Stephen Rust
2019-12-05  3:05                                   ` Ming Lei
2019-12-05  9:17                                 ` Sagi Grimberg
2019-12-05 14:36                                   ` Stephen Rust
     [not found]                                   ` <CAAFE1beqFBQS_zVYEXFTD2qu8PAF9hBSW4j1k9ZD6MhU_gWg5Q@mail.gmail.com>
2020-03-25  0:15                                     ` Sagi Grimberg
2020-03-30 17:08                                       ` Stephen Rust
2020-03-31  1:07                                         ` Sagi Grimberg [this message]
2020-04-01  0:38                                         ` Sagi Grimberg
2020-04-02 20:03                                           ` Stephen Rust
2020-04-02 22:16                                             ` Sagi Grimberg
2019-12-04  2:39                           ` Ming Lei
2019-12-03  4:15                     ` Ming Lei

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