linux-kernel - Re: [PATCH v7 for-next 0/3] IB/core: Obtaining subnet

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Date:   Fri, 9 Jul 2021 20:16:42 +0530
From:   Anand Khoje <anand.a.khoje@...cle.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        dledford@...hat.com, haakon.bugge@...cle.com, leon@...nel.org
Subject: Re: [PATCH v7 for-next 0/3] IB/core: Obtaining subnet_prefix from
 cache in

On 7/9/2021 6:51 PM, Jason Gunthorpe wrote:
> On Tue, Jul 06, 2021 at 12:55:48PM +0530, Anand Khoje wrote:
>> On 6/30/2021 3:16 PM, Anand Khoje wrote:
>>> This v7 of patch series is used to read the port_attribute subnet_prefix
>>> from a valid cache entry instead of having to call
>>> device->ops.query_gid() for Infiniband link-layer devices in
>>> __ib_query_port().
>>>
>>> In the event of a cache update, the value for subnet_prefix gets read
>>> using device->ops.query_gid() in config_non_roce_gid_cache().
>>>
>>> Anand Khoje (3):
>>>     IB/core: Updating cache for subnet_prefix in
>>>       config_non_roce_gid_cache()
>>>     IB/core: Shifting initialization of device->cache_lock.
>>>     IB/core: Read subnet_prefix in ib_query_port via cache.
>>> v1 -> v2:
>>>       -   Split the v1 patch in 3 patches as per Leon's suggestion.
>>>
>>> v2 -> v3:
>>>       -   Added changes as per Mark Zhang's suggestion of clearing
>>>           flags in git_table_cleanup_one().
>>> v3 -> v4:
>>>       -   Removed the enum ib_port_data_flags and 8 byte flags from
>>>           struct ib_port_data, and the set_bit()/clear_bit() API
>>>           used to update this flag as that was not necessary.
>>>           Done to keep the code simple.
>>>       -   Added code to read subnet_prefix from updated GID cache in the
>>>           event of cache update. Prior to this change, ib_cache_update
>>>           was reading the value for subnet_prefix via ib_query_port(),
>>>           due to this patch, we ended up reading a stale cached value of
>>>           subnet_prefix.
>>> v4 -> v5:
>>>       -   Removed the code to reset cache_is_initialised bit from cleanup
>>>           as per Leon's suggestion.
>>>       -   Removed ib_cache_is_initialised() function.
>>>
>>> v5 -> v6:
>>>       -   Added changes as per Jason's suggestion of updating subnet_prefix
>>>           in config_non_roce_gid_cache() and removing the flag
>>>           cache_is_initialized in __ib_query_port().
>>>
>>> v6 -> v7:
>>>       -	Reordering the initialization of cache_lock, as the previous
>>> 	version caused an access to uninitialized cache_lock.
>>>
>>>    drivers/infiniband/core/cache.c  | 10 +++++-----
>>>    drivers/infiniband/core/device.c | 10 ++++------
>>>    2 files changed, 9 insertions(+), 11 deletions(-)
>>>
>>
>> Hi,
>>
>> This is just a reminder note requesting review for this patch-set.
> 
> You'll probably have to resend it after the merge window closed on
> Monday, rebased on the new rc1
> 
> Jason
> 
Hi Jason,

Thanks for the response. Ok, I will rebase and resend this patchset.

Thx, Anand