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net/mlx5: E-Switch, Don't allow changing inline mode when flows are configured

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Changing the eswitch inline mode can potentially cause already configured
flows not to match the policy. E.g. set policy L4, add some L4 rules,
set policy to L2 --> bad! Hence we disallow it.

Keep track of how many offloaded rules are now set and refuse
inline mode changes if this isn't zero.

Fixes: bffaa91658 ("net/mlx5: E-Switch, Add control for inline mode")
Signed-off-by: Roi Dayan <roid@mellanox.com>
Reviewed-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Roi Dayan 2017-03-21 15:59:14 +02:00 committed by David S. Miller
parent d85cdccbb3
commit 375f51e2b5
2 changed files with 9 additions and 0 deletions
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1
drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
View File

@ -209,6 +209,7 @@ struct mlx5_esw_offload {
struct mlx5_eswitch_rep *vport_reps;
DECLARE_HASHTABLE(encap_tbl, 8);
u8 inline_mode;
u64 num_flows;
};
struct mlx5_eswitch {

8
drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
View File

@ -93,6 +93,8 @@ mlx5_eswitch_add_offloaded_rule(struct mlx5_eswitch *esw,
spec, &flow_act, dest, i);
if (IS_ERR(rule))
mlx5_fc_destroy(esw->dev, counter);
else
esw->offloads.num_flows++;
return rule;
}
@ -108,6 +110,7 @@ mlx5_eswitch_del_offloaded_rule(struct mlx5_eswitch *esw,
counter = mlx5_flow_rule_counter(rule);
mlx5_del_flow_rules(rule);
mlx5_fc_destroy(esw->dev, counter);
esw->offloads.num_flows--;
}
}
@ -922,6 +925,11 @@ int mlx5_devlink_eswitch_inline_mode_set(struct devlink *devlink, u8 mode)
MLX5_CAP_INLINE_MODE_VPORT_CONTEXT)
return -EOPNOTSUPP;
if (esw->offloads.num_flows > 0) {
esw_warn(dev, "Can't set inline mode when flows are configured\n");
return -EOPNOTSUPP;
}
err = esw_inline_mode_from_devlink(mode, &mlx5_mode);
if (err)
goto out;