[dpdk-dev] [PATCH] net/mlx5: fix port dead lock when port shutdown

[Xueming(Steven) Li]

Please bypass this patch, new patch submitted at:
	http://www.dpdk.org/dev/patchwork/patch/40412/

> -----Original Message-----
> From: Xueming(Steven) Li
> Sent: Friday, May 25, 2018 2:04 PM
> To: Yongseok Koh <yskoh at mellanox.com>
> Cc: Shahaf Shuler <shahafs at mellanox.com>; dev at dpdk.org; Adrien Mazarguil <adrien.mazarguil at 6wind.com>
> Subject: RE: [PATCH] net/mlx5: fix port dead lock when port shutdown
> 
> 
> 
> > -----Original Message-----
> > From: Yongseok Koh
> > Sent: Friday, May 25, 2018 2:30 AM
> > To: Xueming(Steven) Li <xuemingl at mellanox.com>
> > Cc: Shahaf Shuler <shahafs at mellanox.com>; dev at dpdk.org; Adrien
> > Mazarguil <adrien.mazarguil at 6wind.com>
> > Subject: Re: [PATCH] net/mlx5: fix port dead lock when port shutdown
> >
> >
> > > On May 24, 2018, at 8:20 AM, Xueming Li <xuemingl at mellanox.com> wrote:
> > >
> > > This patch add check to avoid init device MR data twcie which caused
> > > priv data linked to itself in list.
> >
> > A typo.
> >
> > > Fixes: 974f1e7ef146 ("net/mlx5: add new memory region support")
> > > Cc: yskoh at mellanox.com
> > >
> > > Signed-off-by: Xueming Li <xuemingl at mellanox.com>
> > > ---
> > > drivers/net/mlx5/mlx5_ethdev.c | 2 ++
> > > drivers/net/mlx5/mlx5_mr.c     | 1 +
> > > 2 files changed, 3 insertions(+)
> > >
> > > diff --git a/drivers/net/mlx5/mlx5_ethdev.c
> > > b/drivers/net/mlx5/mlx5_ethdev.c index c52ec6fb7..7ffd17ff3 100644
> > > --- a/drivers/net/mlx5/mlx5_ethdev.c
> > > +++ b/drivers/net/mlx5/mlx5_ethdev.c
> > > @@ -398,6 +398,8 @@ mlx5_dev_configure(struct rte_eth_dev *dev)
> > > 	 * deadlock. If it overflows, lookup should be done by searching MR list
> > > 	 * linearly, which is slow.
> > > 	 */
> > > +	if (priv->mr.cache.table)
> > > +		return 0;
> >
> > Thanks, nice catch!
> >
> > Adrien submitted a fix [1] for the similar issue. Adding device to the
> > memory event callback list is moved to mlx5_pci_probe() as it should
> > be done once. So, how about moving the rest
> > (mlx5_mr_btree_init()) to mlx5_pci_probe() as well? I mean, instead of
> > adding this check, you can move the btree_init() above the line where
> > Adrien moved
> > LIST_INSERT_HEAD() to. You'll need to rebase on Adrien's patch and add
> > a comment to Shahaf there's dependency.
> >
> 
> Adrien's patch seems resolved the dead lock issue as well :) Moving mlx5_mr_btree_init() not related
> to it, I'll start a new patch.
> 
> >
> > [1]
> > net/mlx5: fix crash when configure is not called
> > http://dpdk.org/dev/patchwork/patch/40404/
> >
> >
> > Yongseok
> >
> > > 	if (mlx5_mr_btree_init(&priv->mr.cache, MLX5_MR_BTREE_CACHE_N * 2,
> > > 			       dev->device->numa_node)) {
> > > 		/* rte_errno is already set. */
> > > diff --git a/drivers/net/mlx5/mlx5_mr.c b/drivers/net/mlx5/mlx5_mr.c
> > > index abb1f5179..08105a443 100644
> > > --- a/drivers/net/mlx5/mlx5_mr.c
> > > +++ b/drivers/net/mlx5/mlx5_mr.c
> > > @@ -191,6 +191,7 @@ mlx5_mr_btree_init(struct mlx5_mr_btree *bt, int n, int socket)
> > > 		rte_errno = EINVAL;
> > > 		return -rte_errno;
> > > 	}
> > > +	assert(!bt->table && !bt->size);
> > > 	memset(bt, 0, sizeof(*bt));
> > > 	bt->table = rte_calloc_socket("B-tree table",
> > > 				      n, sizeof(struct mlx5_mr_cache),
> > > --
> > > 2.13.3
> > >