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Date: Thu, 9 Jan 2020 19:05:05 +0800
From: Tonghao Zhang <xiangxia.m.yue@...il.com>
To: Or Gerlitz <gerlitz.or@...il.com>
Cc: Saeed Mahameed <saeedm@....mellanox.co.il>,
Roi Dayan <roid@...lanox.com>,
Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] net/mlx5e: Don't allow forwarding between uplink
On Thu, Jan 9, 2020 at 6:32 PM Or Gerlitz <gerlitz.or@...il.com> wrote:
>
> On Tue, Jan 7, 2020 at 11:52 AM <xiangxia.m.yue@...il.com> wrote:
>
> > We can install forwarding packets rule between uplink
> > in eswitchdev mode, as show below. But the hardware does
> > not do that as expected (mlnx_perf -i $PF1, we can't get
> > the counter of the PF1). By the way, if we add the uplink
>
> yeah, IMOH there's probably a firmware bug under which installation
> of this rule doesn't fail but as you said the traffic doesn't pass.
>
> We don't fail the rule b/c due to what we call "merged eswitch"
> which is a building block of the uplink LAG and ECMP configurations
> that we do support, the driver lets you install a flow from (say) VF0
> on PF/uplink0 to uplink1 etc.
>
> Talking to Roi, he prefers to further investigate / open a case to the FW
> and later see if/how to block this rule in the driver.
make any process, please let me know, thanks
> > PF0, PF1 to Open vSwitch and enable hw-offload, the rules
> > can be offloaded but not work fine too. This patch add a
> > check and if so return -EOPNOTSUPP.
> >
> > $ tc filter add dev $PF0 protocol all parent ffff: prio 1 handle 1 \
> > flower skip_sw action mirred egress redirect dev $PF1
> >
> > $ tc -d -s filter show dev $PF0 ingress
> > skip_sw
> > in_hw in_hw_count 1
> > action order 1: mirred (Egress Redirect to device enp130s0f1) stolen
> > ...
> > Sent 408954 bytes 4173 pkt (dropped 0, overlimits 0 requeues 0)
> > Sent hardware 408954 bytes 4173 pkt
> > ...
> >
> > Signed-off-by: Tonghao Zhang <xiangxia.m.yue@...il.com>
> > ---
> > drivers/net/ethernet/mellanox/mlx5/core/en_rep.c | 7 ++++++-
> > drivers/net/ethernet/mellanox/mlx5/core/en_rep.h | 1 +
> > drivers/net/ethernet/mellanox/mlx5/core/en_tc.c | 16 +++++++++++++---
> > 3 files changed, 20 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
> > index f175cb2..63fad66 100644
> > --- a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
> > +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
> > @@ -1434,10 +1434,15 @@ static struct devlink_port *mlx5e_get_devlink_port(struct net_device *dev)
> > .ndo_set_features = mlx5e_set_features,
> > };
> >
> > +bool mlx5e_eswitch_uplink_rep(struct net_device *netdev)
> > +{
> > + return netdev->netdev_ops == &mlx5e_netdev_ops_uplink_rep;
> > +}
> > +
> > bool mlx5e_eswitch_rep(struct net_device *netdev)
> > {
> > if (netdev->netdev_ops == &mlx5e_netdev_ops_rep ||
> > - netdev->netdev_ops == &mlx5e_netdev_ops_uplink_rep)
> > + mlx5e_eswitch_uplink_rep(netdev))
> > return true;
> >
> > return false;
> > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.h b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.h
> > index 31f83c8..282c64b 100644
> > --- a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.h
> > +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.h
> > @@ -198,6 +198,7 @@ void mlx5e_rep_encap_entry_detach(struct mlx5e_priv *priv,
> >
> > void mlx5e_rep_queue_neigh_stats_work(struct mlx5e_priv *priv);
> >
> > +bool mlx5e_eswitch_uplink_rep(struct net_device *netdev);
> > bool mlx5e_eswitch_rep(struct net_device *netdev);
> >
> > #else /* CONFIG_MLX5_ESWITCH */
> > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
> > index f91e057e..b2c18fa 100644
> > --- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
> > +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
> > @@ -3214,6 +3214,10 @@ static int add_vlan_pop_action(struct mlx5e_priv *priv,
> > bool mlx5e_is_valid_eswitch_fwd_dev(struct mlx5e_priv *priv,
> > struct net_device *out_dev)
> > {
> > + if (mlx5e_eswitch_uplink_rep(priv->netdev) &&
> > + mlx5e_eswitch_uplink_rep(out_dev))
> > + return false;
> > +
> > if (is_merged_eswitch_dev(priv, out_dev))
> > return true;
> >
> > @@ -3339,9 +3343,15 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv,
> >
> > if (!mlx5e_is_valid_eswitch_fwd_dev(priv, out_dev)) {
> > NL_SET_ERR_MSG_MOD(extack,
> > - "devices are not on same switch HW, can't offload forwarding");
> > - pr_err("devices %s %s not on same switch HW, can't offload forwarding\n",
> > - priv->netdev->name, out_dev->name);
> > + "devices are both uplink "
> > + "or not on same switch HW, "
> > + "can't offload forwarding");
> > + pr_err("devices %s %s are both uplink "
> > + "or not on same switch HW, "
> > + "can't offload forwarding\n",
> > + priv->netdev->name,
> > + out_dev->name);
> > +
> > return -EOPNOTSUPP;
> > }
> >
> > --
> > 1.8.3.1
> >
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