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From: Maor Gottlieb <maorg@nvidia.com>
To: Gal Pressman <galpress@amazon.com>,
	Jason Gunthorpe <jgg@nvidia.com>,
	"Bob Pearson" <rpearsonhpe@gmail.com>,
	Leon Romanovsky <leonro@nvidia.com>,
	Christoph Hellwig <hch@lst.de>
Cc: <linux-rdma@vger.kernel.org>
Subject: Re: dynamic-sg patch has broken rdma_rxe
Date: Thu, 15 Oct 2020 15:21:34 +0300
Message-ID: <8cf4796d-4dcb-ef5a-83ac-e11134eac99b@nvidia.com> (raw)
In-Reply-To: <63997d02-827c-5a0d-c6a1-427cbeb4ef27@amazon.com>


On 10/15/2020 2:23 PM, Gal Pressman wrote:
> On 15/10/2020 10:44, Maor Gottlieb wrote:
>> On 10/15/2020 1:51 AM, Jason Gunthorpe wrote:
>>> On Tue, Oct 13, 2020 at 09:33:14AM -0500, Bob Pearson wrote:
>>>> Jason,
>>>>
>>>> Just pulled for-next and now hit the following warning.
>>>> Register user space memory is not longer working.
>>>> I am trying to debug this but if you have any idea where to look let me know.
>>> The offset_in_page is wrong, but it is protecting some other logic..
>>>
>>> Maor? Leon? Can you sort it out tomorrow?
>> Leon and I investigated it. This check existed before my series to protect the
>> alloc_table_from_pages logic. It's still relevant.
>> This patch that broke it:  54816d3e69d1 ("RDMA: Explicitly pass in the
>> dma_device to ib_register_device"), and according to below link it was
>> expected.  The safest approach is to set the max_segment_size back the 2GB in
>> all drivers. What do you think?
>>
>> https://lore.kernel.org/linux-rdma/20200923072111.GA31828@infradead.org/
> FWIW, EFA is broken as well (same call trace) so it's not just software drivers.

This is true to all drivers that call to ib_umem_get and set UINT_MAX  
as max_segment_size.
Jason,  maybe instead of set UINT_MAX as max_segment_size, need to set 
SCATTERLIST_MAX_SEGMENT which does the required alignment.

  reply index

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-13 14:33 Bob Pearson
2020-10-13 16:34 ` Bob Pearson
2020-10-14 22:51 ` Jason Gunthorpe
2020-10-15  7:44   ` Maor Gottlieb
2020-10-15 11:23     ` Gal Pressman
2020-10-15 12:21       ` Maor Gottlieb [this message]
2020-10-16  0:31         ` Jason Gunthorpe
2020-10-16  7:13           ` Christoph Hellwig
     [not found]           ` <796ca31aed8f469c957cb850385b9d09@intel.com>
2020-10-16 11:58             ` Jason Gunthorpe
2020-10-19  9:50               ` Tvrtko Ursulin
2020-10-19 12:12                 ` Jason Gunthorpe
2020-10-19 12:29                   ` Tvrtko Ursulin
2020-10-19 12:48                     ` Jason Gunthorpe
2020-10-20 11:37                       ` Tvrtko Ursulin
2020-10-20 11:47                         ` Jason Gunthorpe
2020-10-20 12:31                           ` Tvrtko Ursulin
2020-10-20 12:56                             ` Jason Gunthorpe
2020-10-20 13:09                               ` Tvrtko Ursulin
2020-10-20 13:32                                 ` Jason Gunthorpe
2020-10-15 15:35     ` Bob Pearson

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