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

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Date:   Fri, 9 Jul 2021 10:21:04 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Anand Khoje <anand.a.khoje@...cle.com>
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 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