net/mlx5e: Introduce Flow Steering ANY API

Add a new FS API which captures the ANY traffic from the traffic
classifier into a dedicated FS table. The table consists of a group
matching the ethertype and a must-be-last group which contains a default
rule redirecting the unmatched packets back to the RSS logic.

Signed-off-by: Aya Levin <[email protected]>
Reviewed-by: Tariq Toukan <[email protected]>
Signed-off-by: Saeed Mahameed <[email protected]>

Author: ayalevin

drivers/net/ethernet/mellanox/mlx5/core/en/fs.h

@@ -138,6 +138,7 @@ enum {
 	MLX5E_TTC_FT_LEVEL,
 	MLX5E_INNER_TTC_FT_LEVEL,
 	MLX5E_FS_TT_UDP_FT_LEVEL = MLX5E_INNER_TTC_FT_LEVEL + 1,
+	MLX5E_FS_TT_ANY_FT_LEVEL = MLX5E_INNER_TTC_FT_LEVEL + 1,
 #ifdef CONFIG_MLX5_EN_TLS
 	MLX5E_ACCEL_FS_TCP_FT_LEVEL = MLX5E_INNER_TTC_FT_LEVEL + 1,
 #endif
@@ -243,6 +244,7 @@ struct mlx5e_accel_fs_tcp;
 #endif
 
 struct mlx5e_fs_udp;
+struct mlx5e_fs_any;
 
 struct mlx5e_flow_steering {
 	struct mlx5_flow_namespace      *ns;
@@ -263,6 +265,7 @@ struct mlx5e_flow_steering {
 	struct mlx5e_accel_fs_tcp      *accel_tcp;
 #endif
 	struct mlx5e_fs_udp            *udp;
+	struct mlx5e_fs_any            *any;
 };
 
 struct ttc_params {

drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c

@@ -17,6 +17,12 @@ struct mlx5e_fs_udp {
 	int ref_cnt;
 };
 
+struct mlx5e_fs_any {
+	struct mlx5e_flow_table table;
+	struct mlx5_flow_handle *default_rule;
+	int ref_cnt;
+};
+
 static char *fs_udp_type2str(enum fs_udp_type i)
 {
 	switch (i) {
@@ -341,3 +347,259 @@ int mlx5e_fs_tt_redirect_udp_create(struct mlx5e_priv *priv)
 	priv->fs.udp = NULL;
 	return err;
 }
+
+static void fs_any_set_ethertype_flow(struct mlx5_flow_spec *spec, u16 ether_type)
+{
+	spec->match_criteria_enable = MLX5_MATCH_OUTER_HEADERS;
+	MLX5_SET_TO_ONES(fte_match_param, spec->match_criteria, outer_headers.ethertype);
+	MLX5_SET(fte_match_param, spec->match_value, outer_headers.ethertype, ether_type);
+}
+
+struct mlx5_flow_handle *
+mlx5e_fs_tt_redirect_any_add_rule(struct mlx5e_priv *priv,
+				  u32 tir_num, u16 ether_type)
+{
+	struct mlx5_flow_destination dest = {};
+	struct mlx5_flow_table *ft = NULL;
+	MLX5_DECLARE_FLOW_ACT(flow_act);
+	struct mlx5_flow_handle *rule;
+	struct mlx5_flow_spec *spec;
+	struct mlx5e_fs_any *fs_any;
+	int err;
+
+	spec = kvzalloc(sizeof(*spec), GFP_KERNEL);
+	if (!spec)
+		return ERR_PTR(-ENOMEM);
+
+	fs_any = priv->fs.any;
+	ft = fs_any->table.t;
+
+	fs_any_set_ethertype_flow(spec, ether_type);
+	dest.type = MLX5_FLOW_DESTINATION_TYPE_TIR;
+	dest.tir_num = tir_num;
+
+	rule = mlx5_add_flow_rules(ft, spec, &flow_act, &dest, 1);
+	kvfree(spec);
+
+	if (IS_ERR(rule)) {
+		err = PTR_ERR(rule);
+		netdev_err(priv->netdev, "%s: add ANY rule failed, err %d\n",
+			   __func__, err);
+	}
+	return rule;
+}
+
+static int fs_any_add_default_rule(struct mlx5e_priv *priv)
+{
+	struct mlx5e_flow_table *fs_any_t;
+	struct mlx5_flow_destination dest;
+	MLX5_DECLARE_FLOW_ACT(flow_act);
+	struct mlx5_flow_handle *rule;
+	struct mlx5e_fs_any *fs_any;
+	int err;
+
+	fs_any = priv->fs.any;
+	fs_any_t = &fs_any->table;
+
+	dest = mlx5e_ttc_get_default_dest(priv, MLX5E_TT_ANY);
+	rule = mlx5_add_flow_rules(fs_any_t->t, NULL, &flow_act, &dest, 1);
+	if (IS_ERR(rule)) {
+		err = PTR_ERR(rule);
+		netdev_err(priv->netdev,
+			   "%s: add default rule failed, fs type=ANY, err %d\n",
+			   __func__, err);
+		return err;
+	}
+
+	fs_any->default_rule = rule;
+	return 0;
+}
+
+#define MLX5E_FS_ANY_NUM_GROUPS	(2)
+#define MLX5E_FS_ANY_GROUP1_SIZE	(BIT(16))
+#define MLX5E_FS_ANY_GROUP2_SIZE	(BIT(0))
+#define MLX5E_FS_ANY_TABLE_SIZE		(MLX5E_FS_ANY_GROUP1_SIZE +\
+					 MLX5E_FS_ANY_GROUP2_SIZE)
+
+static int fs_any_create_groups(struct mlx5e_flow_table *ft)
+{
+	int inlen = MLX5_ST_SZ_BYTES(create_flow_group_in);
+	void *outer_headers_c;
+	int ix = 0;
+	u32 *in;
+	int err;
+	u8 *mc;
+
+	ft->g = kcalloc(MLX5E_FS_UDP_NUM_GROUPS, sizeof(*ft->g), GFP_KERNEL);
+	in = kvzalloc(inlen, GFP_KERNEL);
+	if  (!in || !ft->g) {
+		kfree(ft->g);
+		kvfree(in);
+		return -ENOMEM;
+	}
+
+	/* Match on ethertype */
+	mc = MLX5_ADDR_OF(create_flow_group_in, in, match_criteria);
+	outer_headers_c = MLX5_ADDR_OF(fte_match_param, mc, outer_headers);
+	MLX5_SET_TO_ONES(fte_match_set_lyr_2_4, outer_headers_c, ethertype);
+	MLX5_SET_CFG(in, match_criteria_enable, MLX5_MATCH_OUTER_HEADERS);
+	MLX5_SET_CFG(in, start_flow_index, ix);
+	ix += MLX5E_FS_ANY_GROUP1_SIZE;
+	MLX5_SET_CFG(in, end_flow_index, ix - 1);
+	ft->g[ft->num_groups] = mlx5_create_flow_group(ft->t, in);
+	if (IS_ERR(ft->g[ft->num_groups]))
+		goto err;
+	ft->num_groups++;
+
+	/* Default Flow Group */
+	memset(in, 0, inlen);
+	MLX5_SET_CFG(in, start_flow_index, ix);
+	ix += MLX5E_FS_ANY_GROUP2_SIZE;
+	MLX5_SET_CFG(in, end_flow_index, ix - 1);
+	ft->g[ft->num_groups] = mlx5_create_flow_group(ft->t, in);
+	if (IS_ERR(ft->g[ft->num_groups]))
+		goto err;
+	ft->num_groups++;
+
+	kvfree(in);
+	return 0;
+
+err:
+	err = PTR_ERR(ft->g[ft->num_groups]);
+	ft->g[ft->num_groups] = NULL;
+	kvfree(in);
+
+	return err;
+}
+
+static int fs_any_create_table(struct mlx5e_priv *priv)
+{
+	struct mlx5e_flow_table *ft = &priv->fs.any->table;
+	struct mlx5_flow_table_attr ft_attr = {};
+	int err;
+
+	ft->num_groups = 0;
+
+	ft_attr.max_fte = MLX5E_FS_UDP_TABLE_SIZE;
+	ft_attr.level = MLX5E_FS_TT_ANY_FT_LEVEL;
+	ft_attr.prio = MLX5E_NIC_PRIO;
+
+	ft->t = mlx5_create_flow_table(priv->fs.ns, &ft_attr);
+	if (IS_ERR(ft->t)) {
+		err = PTR_ERR(ft->t);
+		ft->t = NULL;
+		return err;
+	}
+
+	netdev_dbg(priv->netdev, "Created fs ANY table id %u level %u\n",
+		   ft->t->id, ft->t->level);
+
+	err = fs_any_create_groups(ft);
+	if (err)
+		goto err;
+
+	err = fs_any_add_default_rule(priv);
+	if (err)
+		goto err;
+
+	return 0;
+
+err:
+	mlx5e_destroy_flow_table(ft);
+	return err;
+}
+
+static int fs_any_disable(struct mlx5e_priv *priv)
+{
+	int err;
+
+	/* Modify ttc rules destination to point back to the indir TIRs */
+	err = mlx5e_ttc_fwd_default_dest(priv, MLX5E_TT_ANY);
+	if (err) {
+		netdev_err(priv->netdev,
+			   "%s: modify ttc[%d] default destination failed, err(%d)\n",
+			   __func__, MLX5E_TT_ANY, err);
+		return err;
+	}
+	return 0;
+}
+
+static int fs_any_enable(struct mlx5e_priv *priv)
+{
+	struct mlx5_flow_destination dest = {};
+	int err;
+
+	dest.type = MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE;
+	dest.ft = priv->fs.any->table.t;
+
+	/* Modify ttc rules destination to point on the accel_fs FTs */
+	err = mlx5e_ttc_fwd_dest(priv, MLX5E_TT_ANY, &dest);
+	if (err) {
+		netdev_err(priv->netdev,
+			   "%s: modify ttc[%d] destination to accel failed, err(%d)\n",
+			   __func__, MLX5E_TT_ANY, err);
+		return err;
+	}
+	return 0;
+}
+
+static void fs_any_destroy_table(struct mlx5e_fs_any *fs_any)
+{
+	if (IS_ERR_OR_NULL(fs_any->table.t))
+		return;
+
+	mlx5_del_flow_rules(fs_any->default_rule);
+	mlx5e_destroy_flow_table(&fs_any->table);
+	fs_any->table.t = NULL;
+}
+
+void mlx5e_fs_tt_redirect_any_destroy(struct mlx5e_priv *priv)
+{
+	struct mlx5e_fs_any *fs_any = priv->fs.any;
+
+	if (!fs_any)
+		return;
+
+	if (--fs_any->ref_cnt)
+		return;
+
+	fs_any_disable(priv);
+
+	fs_any_destroy_table(fs_any);
+
+	kfree(fs_any);
+	priv->fs.any = NULL;
+}
+
+int mlx5e_fs_tt_redirect_any_create(struct mlx5e_priv *priv)
+{
+	int err;
+
+	if (priv->fs.any) {
+		priv->fs.any->ref_cnt++;
+		return 0;
+	}
+
+	priv->fs.any = kzalloc(sizeof(*priv->fs.any), GFP_KERNEL);
+	if (!priv->fs.any)
+		return -ENOMEM;
+
+	err = fs_any_create_table(priv);
+	if (err)
+		return err;
+
+	err = fs_any_enable(priv);
+	if (err)
+		goto err_destroy_table;
+
+	priv->fs.any->ref_cnt = 1;
+
+	return 0;
+
+err_destroy_table:
+	fs_any_destroy_table(priv->fs.any);
+
+	kfree(priv->fs.any);
+	priv->fs.any = NULL;
+	return err;
+}

drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.h

@@ -16,4 +16,11 @@ mlx5e_fs_tt_redirect_udp_add_rule(struct mlx5e_priv *priv,
 				  u32 tir_num, u16 d_port);
 void mlx5e_fs_tt_redirect_udp_destroy(struct mlx5e_priv *priv);
 int mlx5e_fs_tt_redirect_udp_create(struct mlx5e_priv *priv);
+
+/* ANY traffic type redirect*/
+struct mlx5_flow_handle *
+mlx5e_fs_tt_redirect_any_add_rule(struct mlx5e_priv *priv,
+				  u32 tir_num, u16 ether_type);
+void mlx5e_fs_tt_redirect_any_destroy(struct mlx5e_priv *priv);
+int mlx5e_fs_tt_redirect_any_create(struct mlx5e_priv *priv);
 #endif

drivers/net/ethernet/mellanox/mlx5/core/fs_core.c

@@ -105,7 +105,7 @@
 #define ETHTOOL_PRIO_NUM_LEVELS 1
 #define ETHTOOL_NUM_PRIOS 11
 #define ETHTOOL_MIN_LEVEL (KERNEL_MIN_LEVEL + ETHTOOL_NUM_PRIOS)
-/* Promiscuous, Vlan, mac, ttc, inner ttc, {UDP/aRFS/accel/{esp, esp_err}} */
+/* Promiscuous, Vlan, mac, ttc, inner ttc, {UDP/ANY/aRFS/accel/{esp, esp_err}} */
 #define KERNEL_NIC_PRIO_NUM_LEVELS 7
 #define KERNEL_NIC_NUM_PRIOS 1
 /* One more level for tc */