[PATCH net-next 09/15] mlxsw: spectrum_acl: Don't take rtnl lock during vregion_rehash_intrvl_set()

[Ido Schimmel]

From: Jiri Pirko <j...@mellanox.com>

Relax dependency on rtnl mutex during vregion_rehash_intrvl_set(). The
vregion list is protected with newly introduced mutex.

Signed-off-by: Jiri Pirko <j...@mellanox.com>
Signed-off-by: Ido Schimmel <ido...@mellanox.com>
---
 .../net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c   | 11 +++++++++--
 .../net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.h   |  1 +
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c 
b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c
index cdbcf612b6fd..5c8976e471ad 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c
@@ -38,6 +38,7 @@ int mlxsw_sp_acl_tcam_init(struct mlxsw_sp *mlxsw_sp,
        size_t alloc_size;
        int err;
 
+       mutex_init(&tcam->lock);
        tcam->vregion_rehash_intrvl =
                        MLXSW_SP_ACL_TCAM_VREGION_REHASH_INTRVL_DFLT;
        INIT_LIST_HEAD(&tcam->vregion_list);
@@ -85,6 +86,7 @@ void mlxsw_sp_acl_tcam_fini(struct mlxsw_sp *mlxsw_sp,
 {
        const struct mlxsw_sp_acl_tcam_ops *ops = mlxsw_sp->acl_tcam_ops;
 
+       mutex_destroy(&tcam->lock);
        ops->fini(mlxsw_sp, tcam->priv);
        kfree(tcam->used_groups);
        kfree(tcam->used_regions);
@@ -784,7 +786,9 @@ mlxsw_sp_acl_tcam_vregion_create(struct mlxsw_sp *mlxsw_sp,
                INIT_DELAYED_WORK(&vregion->rehash_dw,
                                  mlxsw_sp_acl_tcam_vregion_rehash_work);
                mlxsw_sp_acl_tcam_vregion_rehash_work_schedule(vregion);
+               mutex_lock(&tcam->lock);
                list_add_tail(&vregion->tlist, &tcam->vregion_list);
+               mutex_unlock(&tcam->lock);
        }
 
        return vregion;
@@ -804,9 +808,12 @@ mlxsw_sp_acl_tcam_vregion_destroy(struct mlxsw_sp 
*mlxsw_sp,
 {
        const struct mlxsw_sp_acl_tcam_ops *ops = mlxsw_sp->acl_tcam_ops;
        struct mlxsw_sp_acl_tcam_vgroup *vgroup = vregion->vgroup;
+       struct mlxsw_sp_acl_tcam *tcam = vregion->tcam;
 
        if (vgroup->vregion_rehash_enabled && ops->region_rehash_hints_get) {
+               mutex_lock(&tcam->lock);
                list_del(&vregion->tlist);
+               mutex_unlock(&tcam->lock);
                cancel_delayed_work_sync(&vregion->rehash_dw);
        }
        mlxsw_sp_acl_tcam_vgroup_vregion_detach(mlxsw_sp, vregion);
@@ -842,14 +849,14 @@ int mlxsw_sp_acl_tcam_vregion_rehash_intrvl_set(struct 
mlxsw_sp *mlxsw_sp,
        if (WARN_ON(!ops->region_rehash_hints_get))
                return -EOPNOTSUPP;
        tcam->vregion_rehash_intrvl = val;
-       rtnl_lock();
+       mutex_lock(&tcam->lock);
        list_for_each_entry(vregion, &tcam->vregion_list, tlist) {
                if (val)
                        mlxsw_core_schedule_dw(&vregion->rehash_dw, 0);
                else
                        cancel_delayed_work_sync(&vregion->rehash_dw);
        }
-       rtnl_unlock();
+       mutex_unlock(&tcam->lock);
        return 0;
 }
 
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.h 
b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.h
index 77de76647ede..5965913565a5 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.h
@@ -17,6 +17,7 @@ struct mlxsw_sp_acl_tcam {
        unsigned long *used_groups;  /* bit array */
        unsigned int max_groups;
        unsigned int max_group_size;
+       struct mutex lock; /* guards vregion list */
        struct list_head vregion_list;
        u32 vregion_rehash_intrvl;   /* ms */
        unsigned long priv[0];
-- 
2.20.1