From b6fac0b46a1a76024698d240f0f9aac552f897b7 Mon Sep 17 00:00:00 2001 From: Vlad Buslov Date: Mon, 17 Sep 2018 14:01:58 +0300 Subject: [PATCH] net/mlx5e: Protect tc flow table with mutex TC flow table is created when first flow is added, and destroyed when last flow is removed. This assumes that all accesses to the table are externally synchronized with rtnl lock. To remove dependency on rtnl lock, add new mutex mlx5e_tc_table->t_lock and use it to protect the flow table. Signed-off-by: Vlad Buslov Reviewed-by: Jianbo Liu Reviewed-by: Roi Dayan Signed-off-by: Saeed Mahameed --- drivers/net/ethernet/mellanox/mlx5/core/en/fs.h | 2 ++ drivers/net/ethernet/mellanox/mlx5/core/en_tc.c | 7 +++++++ 2 files changed, 9 insertions(+) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/fs.h b/drivers/net/ethernet/mellanox/mlx5/core/en/fs.h index eb70ada89b09..4518ce19112e 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en/fs.h +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/fs.h @@ -10,6 +10,8 @@ enum { }; struct mlx5e_tc_table { + /* protects flow table */ + struct mutex t_lock; struct mlx5_flow_table *t; struct rhashtable ht; diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c index 595a4c5667ea..f3ed028d5017 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c @@ -854,6 +854,7 @@ mlx5e_tc_add_nic_flow(struct mlx5e_priv *priv, return err; } + mutex_lock(&priv->fs.tc.t_lock); if (IS_ERR_OR_NULL(priv->fs.tc.t)) { int tc_grp_size, tc_tbl_size; u32 max_flow_counter; @@ -873,6 +874,7 @@ mlx5e_tc_add_nic_flow(struct mlx5e_priv *priv, MLX5E_TC_TABLE_NUM_GROUPS, MLX5E_TC_FT_LEVEL, 0); if (IS_ERR(priv->fs.tc.t)) { + mutex_unlock(&priv->fs.tc.t_lock); NL_SET_ERR_MSG_MOD(extack, "Failed to create tc offload table\n"); netdev_err(priv->netdev, @@ -886,6 +888,7 @@ mlx5e_tc_add_nic_flow(struct mlx5e_priv *priv, flow->rule[0] = mlx5_add_flow_rules(priv->fs.tc.t, &parse_attr->spec, &flow_act, dest, dest_ix); + mutex_unlock(&priv->fs.tc.t_lock); if (IS_ERR(flow->rule[0])) return PTR_ERR(flow->rule[0]); @@ -904,10 +907,12 @@ static void mlx5e_tc_del_nic_flow(struct mlx5e_priv *priv, mlx5_del_flow_rules(flow->rule[0]); mlx5_fc_destroy(priv->mdev, counter); + mutex_lock(&priv->fs.tc.t_lock); if (!mlx5e_tc_num_filters(priv, MLX5_TC_FLAG(NIC_OFFLOAD)) && priv->fs.tc.t) { mlx5_destroy_flow_table(priv->fs.tc.t); priv->fs.tc.t = NULL; } + mutex_unlock(&priv->fs.tc.t_lock); if (attr->action & MLX5_FLOW_CONTEXT_ACTION_MOD_HDR) mlx5e_detach_mod_hdr(priv, flow); @@ -3684,6 +3689,7 @@ int mlx5e_tc_nic_init(struct mlx5e_priv *priv) struct mlx5e_tc_table *tc = &priv->fs.tc; int err; + mutex_init(&tc->t_lock); hash_init(tc->mod_hdr_tbl); hash_init(tc->hairpin_tbl); @@ -3722,6 +3728,7 @@ void mlx5e_tc_nic_cleanup(struct mlx5e_priv *priv) mlx5_destroy_flow_table(tc->t); tc->t = NULL; } + mutex_destroy(&tc->t_lock); } int mlx5e_tc_esw_init(struct rhashtable *tc_ht) -- 2.30.2