From: Eric Dumazet <eric.dumazet@gmail.com>
To: Saeed Mahameed <saeedm@dev.mellanox.co.il>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>,
David Miller <davem@davemloft.net>,
netdev <netdev@vger.kernel.org>,
Tariq Toukan <tariqt@mellanox.com>
Subject: Re: Regression: [PATCH] mlx4: give precise rx/tx bytes/packets counters
Date: Thu, 01 Dec 2016 09:36:04 -0800 [thread overview]
Message-ID: <1480613764.18162.324.camel@edumazet-glaptop3.roam.corp.google.com> (raw)
In-Reply-To: <1480608517.18162.313.camel@edumazet-glaptop3.roam.corp.google.com>
On Thu, 2016-12-01 at 08:08 -0800, Eric Dumazet wrote:
> On Thu, 2016-12-01 at 07:55 -0800, Eric Dumazet wrote:
>
> > So removing the spinlock is doable, but needs to add a new parameter
> > to mlx4_en_fold_software_stats() and call netdev_stats_to_stats64()
> > before mlx4_en_fold_software_stats(dev)
>
> Untested patch would be :
>
> drivers/net/ethernet/mellanox/mlx4/en_ethtool.c | 2 -
> drivers/net/ethernet/mellanox/mlx4/en_netdev.c | 10 +----
> drivers/net/ethernet/mellanox/mlx4/en_port.c | 24 +++++++++-----
> drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | 3 +
> 4 files changed, 23 insertions(+), 16 deletions(-)
The patch is wrong, since priv->port_up could change to false while we
are running and using the about to be deleted tx/rx rings.
So the only safe thing to do is to remove the _bh suffix.
Not worth trying to avoid taking a spinlock in this code.
next prev parent reply other threads:[~2016-12-01 17:37 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-25 15:46 [PATCH] mlx4: give precise rx/tx bytes/packets counters Eric Dumazet
2016-11-25 16:03 ` David Laight
2016-11-25 16:16 ` Eric Dumazet
2016-11-25 16:30 ` Aw: " Lino Sanfilippo
2016-11-25 19:19 ` Eric Dumazet
2016-11-28 22:02 ` Lino Sanfilippo
2016-11-29 0:19 ` Eric Dumazet
2016-11-30 15:28 ` David Laight
2016-11-30 15:47 ` Eric Dumazet
2016-11-26 22:47 ` Saeed Mahameed
2016-11-27 2:16 ` Eric Dumazet
2016-11-28 20:40 ` David Miller
2016-11-28 21:55 ` Saeed Mahameed
2016-11-28 22:57 ` Eric Dumazet
2016-11-29 18:37 ` David Miller
2016-11-30 14:08 ` Regression: " Jesper Dangaard Brouer
2016-11-30 15:58 ` Eric Dumazet
2016-11-30 16:46 ` Saeed Mahameed
2016-11-30 17:35 ` Eric Dumazet
2016-11-30 20:42 ` Saeed Mahameed
2016-11-30 21:00 ` Eric Dumazet
2016-12-01 12:37 ` Jesper Dangaard Brouer
2016-12-01 13:02 ` [PATCH net-next] mlx4: fix use-after-free in mlx4_en_fold_software_stats() Eric Dumazet
2016-12-01 15:23 ` Saeed Mahameed
2016-12-02 18:36 ` David Miller
2016-12-01 15:38 ` Regression: [PATCH] mlx4: give precise rx/tx bytes/packets counters Saeed Mahameed
2016-12-01 15:55 ` Eric Dumazet
2016-12-01 16:08 ` Eric Dumazet
2016-12-01 17:36 ` Eric Dumazet [this message]
2016-12-04 13:23 ` Saeed Mahameed
2016-12-01 16:33 ` Saeed Mahameed
2016-12-01 17:08 ` Eric Dumazet
2016-12-04 13:21 ` Saeed Mahameed
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