Re: [dpdk-dev] [PATCH v1] net/mlx5: fix secondary process resource leakage

[Shahaf Shuler <shahafs@mellanox.com>]

Wednesday, August 1, 2018 11:01 AM, Shahaf Shuler:
> Subject: RE: [dpdk-dev] [PATCH v1] net/mlx5: fix secondary process resource
> leakage
> 
> Hi Ophir,
> 
> Wednesday, August 1, 2018 1:38 AM, Ophir Munk:
> > Subject: [dpdk-dev] [PATCH v1] net/mlx5: fix secondary process
> > resource leakage
> >
> > When running testpmd with an mlx5 device and then executing at testpmd
> > prompt in a raw: "port start all" followed by "port stop all"
> > a new file named /var/tmp/net_mlx5_<socket num> is created as a result
> > of creating a new unix domain socket (used for communication between
> > the primary and secondary processes).
> > When the new unix socket file is created the old unix socket file
> > should have been removed. This commit fixes it by closing the old unix
> > socket just before creating the new one in function mlx5_socket_init()
> >
> > Fixes: f8b9a3bad467 ("net/mlx5: install a socket to exchange a file
> > descriptor")
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: Ophir Munk <ophirmu@mellanox.com>
> > ---
> >  drivers/net/mlx5/mlx5_socket.c | 6 ++++++
> >  1 file changed, 6 insertions(+)
> >
> > diff --git a/drivers/net/mlx5/mlx5_socket.c
> > b/drivers/net/mlx5/mlx5_socket.c index 99297d5..a3a5229 100644
> > --- a/drivers/net/mlx5/mlx5_socket.c
> > +++ b/drivers/net/mlx5/mlx5_socket.c
> > @@ -36,6 +36,12 @@
> >  	int flags;
> >
> >  	/*
> > +	 * Close the last socket that was used to communicate
> > +	 * with the secondary process
> > +	 */
> > +	if (priv->primary_socket)
> > +		mlx5_socket_uninit(dev);
> 
> On the current code the primary socket is created on port start and removed
> on port close (this is the bug you address).
> Wouldn't it be better to just create it on probe?
> This way the primary sets up its socket when the ethdev is created and
> removes it when it is destroyed. The handling of the socket event still
> happen only when the primary ports start because only then the interrupt
> handler is installed.

After internal discussion w/ Ophir we decided to take this patch as is considering we are very late on this release and this fix has a low risk to break something else.
We need to address this one on the next release in a better way. 

Applied to next-net-mlx, thanks. 

> 
> > +	/*
> >  	 * Initialise the socket to communicate with the secondary
> >  	 * process.
> >  	 */
> > --
> > 1.8.3.1