mlxsw: spectrum: Implement common FID core

The device supports three types of FIDs. 802.1Q and 802.1D FIDs for
VLAN-aware and VLAN-unaware bridges (respectively) and rFIDs to
transport packets to the router block.

The different users (e.g., bridge, router, ACLs) of the FIDs
infrastructure need not know about the internal FIDs implementation and
can therefore interact with it using a restricted set of exported
functions.

By encapsulating the entire FID logic and hiding it from the rest of the
driver we get a code base that it much simpler and easier to work with
and extend.

For example, in the current Spectrum ASIC only 802.1D FIDs can be
assigned a VNI, but future ASICs will also support 802.1Q FIDs. With
this patch in place, support for future ASICs can be easily added by
implementing a new FID operations according to their capabilities.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl.c
index 317f7b14627f..1da889a044df 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl.c
@@ -53,6 +53,7 @@ struct mlxsw_sp_acl {
 	struct mlxsw_sp *mlxsw_sp;
 	struct mlxsw_afk *afk;
 	struct mlxsw_afa *afa;
+	struct mlxsw_sp_fid *dummy_fid;
 	const struct mlxsw_sp_acl_ops *ops;
 	struct rhashtable ruleset_ht;
 	struct list_head rules;
@@ -112,6 +113,11 @@ static const struct rhashtable_params mlxsw_sp_acl_rule_ht_params = {
 	.automatic_shrinking = true,
 };
 
+struct mlxsw_sp_fid *mlxsw_sp_acl_dummy_fid(struct mlxsw_sp *mlxsw_sp)
+{
+	return mlxsw_sp->acl->dummy_fid;
+}
+
 static struct mlxsw_sp_acl_ruleset *
 mlxsw_sp_acl_ruleset_create(struct mlxsw_sp *mlxsw_sp,
 			    const struct mlxsw_sp_acl_profile_ops *ops)
@@ -676,6 +682,7 @@ static const struct mlxsw_afa_ops mlxsw_sp_act_afa_ops = {
 int mlxsw_sp_acl_init(struct mlxsw_sp *mlxsw_sp)
 {
 	const struct mlxsw_sp_acl_ops *acl_ops = &mlxsw_sp_acl_tcam_ops;
+	struct mlxsw_sp_fid *fid;
 	struct mlxsw_sp_acl *acl;
 	int err;
 
@@ -706,6 +713,13 @@ int mlxsw_sp_acl_init(struct mlxsw_sp *mlxsw_sp)
 	if (err)
 		goto err_rhashtable_init;
 
+	fid = mlxsw_sp_fid_dummy_get(mlxsw_sp);
+	if (IS_ERR(fid)) {
+		err = PTR_ERR(fid);
+		goto err_fid_get;
+	}
+	acl->dummy_fid = fid;
+
 	INIT_LIST_HEAD(&acl->rules);
 	err = acl_ops->init(mlxsw_sp, acl->priv);
 	if (err)
@@ -721,6 +735,8 @@ int mlxsw_sp_acl_init(struct mlxsw_sp *mlxsw_sp)
 	return 0;
 
 err_acl_ops_init:
+	mlxsw_sp_fid_put(fid);
+err_fid_get:
 	rhashtable_destroy(&acl->ruleset_ht);
 err_rhashtable_init:
 	mlxsw_afa_destroy(acl->afa);
@@ -739,6 +755,7 @@ void mlxsw_sp_acl_fini(struct mlxsw_sp *mlxsw_sp)
 	cancel_delayed_work_sync(&mlxsw_sp->acl->rule_activity_update.dw);
 	acl_ops->fini(mlxsw_sp, acl->priv);
 	WARN_ON(!list_empty(&acl->rules));
+	mlxsw_sp_fid_put(acl->dummy_fid);
 	rhashtable_destroy(&acl->ruleset_ht);
 	mlxsw_afa_destroy(acl->afa);
 	mlxsw_afk_destroy(acl->afk);