linux-kernel - Re: [PATCH net] rds: introduce acquire/release ordering in acquire/release_in

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Date: Fri, 15 Mar 2024 18:24:57 +0900
From: Yewon Choi <woni9911@...il.com>
To: Allison Henderson <allison.henderson@...cle.com>,
	Michal Kubiak <michal.kubiak@...el.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
	rds-devel@....oracle.com, linux-kernel@...r.kernel.org,
	"Dae R. Jeong" <threeearcat@...il.com>
Subject: Re: [PATCH net] rds: introduce acquire/release ordering in
 acquire/release_in_xmit()

On Thu, Mar 14, 2024 at 10:37:29PM +0000, Allison Henderson wrote:
> On Thu, 2024-03-14 at 12:51 +0100, Michal Kubiak wrote:
> > On Thu, Mar 14, 2024 at 08:21:35PM +0900, Yewon Choi wrote:
> > > acquire/release_in_xmit() work as bit lock in rds_send_xmit(), so
> > > they
> > > are expected to ensure acquire/release memory ordering semantics.
> > > However, test_and_set_bit/clear_bit() don't imply such semantics,
> > > on
> > > top of this, following smp_mb__after_atomic() does not guarantee
> > > release
> > > ordering (memory barrier actually should be placed before
> > > clear_bit()).
> > > 
> > > Instead, we use clear_bit_unlock/test_and_set_bit_lock() here.
> > > 
> > > Signed-off-by: Yewon Choi <woni9911@...il.com>
> > 
> > Missing "Fixes" tag for the patch addressed to the "net" tree.
> >

Sorry for mistake, I'll correct this and send v2 patch.

> > Thanks,
> > Michal
> 
> Yes, I think it needs:
> 
> Fixes: 1f9ecd7eacfd ("RDS: Pass rds_conn_path to rds_send_xmit()")
>
> Since that is the last patch to modify the affected code.  Other than
> that I think the patch looks good.  With the tag fixed, you can add my
> rvb:
> 

Also, test_and_set_bit/clear_bit() was first introduced in
commit 0f4b1c7e89e6. I think this can be added, too:

Fixes: 0f4b1c7e89e6 ("rds: fix rds_send_xmit() serialization")

> Reviewed-by: Allison Henderson <allison.henderson@...cle.com>
> > 
> 

Thank you for the reviewing.

Sincerely,
Yewon Choi