net/mlx5: E-Switch, Move legacy code to a individual file

Currently eswitch offers two modes. Legacy and offloads.
Offloads code is already in its own file eswitch_offloads.c

However eswitch.c contains the eswitch legacy code and common
infrastructure  code.

To enable future extensions and to better manage generic common eswitch
infrastructure code, move the legacy code to its own legacy.c file.

Signed-off-by: Parav Pandit <parav@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

2 files changed, 531 insertions, 0 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/esw/legacy.c b/drivers/net/ethernet/mellanox/mlx5/core/esw/legacy.c
new file mode 100644
index 000000000000..8ab1224653a4
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx5/core/esw/legacy.c
@@ -0,0 +1,509 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+/* Copyright (c) 2021 Mellanox Technologies Ltd */
+
+#include <linux/etherdevice.h>
+#include <linux/mlx5/driver.h>
+#include <linux/mlx5/mlx5_ifc.h>
+#include <linux/mlx5/vport.h>
+#include <linux/mlx5/fs.h>
+#include "esw/acl/lgcy.h"
+#include "esw/legacy.h"
+#include "mlx5_core.h"
+#include "eswitch.h"
+#include "fs_core.h"
+
+enum {
+	LEGACY_VEPA_PRIO = 0,
+	LEGACY_FDB_PRIO,
+};
+
+static int esw_create_legacy_vepa_table(struct mlx5_eswitch *esw)
+{
+	struct mlx5_flow_table_attr ft_attr = {};
+	struct mlx5_core_dev *dev = esw->dev;
+	struct mlx5_flow_namespace *root_ns;
+	struct mlx5_flow_table *fdb;
+	int err;
+
+	root_ns = mlx5_get_fdb_sub_ns(dev, 0);
+	if (!root_ns) {
+		esw_warn(dev, "Failed to get FDB flow namespace\n");
+		return -EOPNOTSUPP;
+	}
+
+	/* num FTE 2, num FG 2 */
+	ft_attr.prio = LEGACY_VEPA_PRIO;
+	ft_attr.max_fte = 2;
+	ft_attr.autogroup.max_num_groups = 2;
+	fdb = mlx5_create_auto_grouped_flow_table(root_ns, &ft_attr);
+	if (IS_ERR(fdb)) {
+		err = PTR_ERR(fdb);
+		esw_warn(dev, "Failed to create VEPA FDB err %d\n", err);
+		return err;
+	}
+	esw->fdb_table.legacy.vepa_fdb = fdb;
+
+	return 0;
+}
+
+static void esw_destroy_legacy_fdb_table(struct mlx5_eswitch *esw)
+{
+	esw_debug(esw->dev, "Destroy FDB Table\n");
+	if (!esw->fdb_table.legacy.fdb)
+		return;
+
+	if (esw->fdb_table.legacy.promisc_grp)
+		mlx5_destroy_flow_group(esw->fdb_table.legacy.promisc_grp);
+	if (esw->fdb_table.legacy.allmulti_grp)
+		mlx5_destroy_flow_group(esw->fdb_table.legacy.allmulti_grp);
+	if (esw->fdb_table.legacy.addr_grp)
+		mlx5_destroy_flow_group(esw->fdb_table.legacy.addr_grp);
+	mlx5_destroy_flow_table(esw->fdb_table.legacy.fdb);
+
+	esw->fdb_table.legacy.fdb = NULL;
+	esw->fdb_table.legacy.addr_grp = NULL;
+	esw->fdb_table.legacy.allmulti_grp = NULL;
+	esw->fdb_table.legacy.promisc_grp = NULL;
+	atomic64_set(&esw->user_count, 0);
+}
+
+static int esw_create_legacy_fdb_table(struct mlx5_eswitch *esw)
+{
+	int inlen = MLX5_ST_SZ_BYTES(create_flow_group_in);
+	struct mlx5_flow_table_attr ft_attr = {};
+	struct mlx5_core_dev *dev = esw->dev;
+	struct mlx5_flow_namespace *root_ns;
+	struct mlx5_flow_table *fdb;
+	struct mlx5_flow_group *g;
+	void *match_criteria;
+	int table_size;
+	u32 *flow_group_in;
+	u8 *dmac;
+	int err = 0;
+
+	esw_debug(dev, "Create FDB log_max_size(%d)\n",
+		  MLX5_CAP_ESW_FLOWTABLE_FDB(dev, log_max_ft_size));
+
+	root_ns = mlx5_get_fdb_sub_ns(dev, 0);
+	if (!root_ns) {
+		esw_warn(dev, "Failed to get FDB flow namespace\n");
+		return -EOPNOTSUPP;
+	}
+
+	flow_group_in = kvzalloc(inlen, GFP_KERNEL);
+	if (!flow_group_in)
+		return -ENOMEM;
+
+	table_size = BIT(MLX5_CAP_ESW_FLOWTABLE_FDB(dev, log_max_ft_size));
+	ft_attr.max_fte = table_size;
+	ft_attr.prio = LEGACY_FDB_PRIO;
+	fdb = mlx5_create_flow_table(root_ns, &ft_attr);
+	if (IS_ERR(fdb)) {
+		err = PTR_ERR(fdb);
+		esw_warn(dev, "Failed to create FDB Table err %d\n", err);
+		goto out;
+	}
+	esw->fdb_table.legacy.fdb = fdb;
+
+	/* Addresses group : Full match unicast/multicast addresses */
+	MLX5_SET(create_flow_group_in, flow_group_in, match_criteria_enable,
+		 MLX5_MATCH_OUTER_HEADERS);
+	match_criteria = MLX5_ADDR_OF(create_flow_group_in, flow_group_in, match_criteria);
+	dmac = MLX5_ADDR_OF(fte_match_param, match_criteria, outer_headers.dmac_47_16);
+	MLX5_SET(create_flow_group_in, flow_group_in, start_flow_index, 0);
+	/* Preserve 2 entries for allmulti and promisc rules*/
+	MLX5_SET(create_flow_group_in, flow_group_in, end_flow_index, table_size - 3);
+	eth_broadcast_addr(dmac);
+	g = mlx5_create_flow_group(fdb, flow_group_in);
+	if (IS_ERR(g)) {
+		err = PTR_ERR(g);
+		esw_warn(dev, "Failed to create flow group err(%d)\n", err);
+		goto out;
+	}
+	esw->fdb_table.legacy.addr_grp = g;
+
+	/* Allmulti group : One rule that forwards any mcast traffic */
+	MLX5_SET(create_flow_group_in, flow_group_in, match_criteria_enable,
+		 MLX5_MATCH_OUTER_HEADERS);
+	MLX5_SET(create_flow_group_in, flow_group_in, start_flow_index, table_size - 2);
+	MLX5_SET(create_flow_group_in, flow_group_in, end_flow_index, table_size - 2);
+	eth_zero_addr(dmac);
+	dmac[0] = 0x01;
+	g = mlx5_create_flow_group(fdb, flow_group_in);
+	if (IS_ERR(g)) {
+		err = PTR_ERR(g);
+		esw_warn(dev, "Failed to create allmulti flow group err(%d)\n", err);
+		goto out;
+	}
+	esw->fdb_table.legacy.allmulti_grp = g;
+
+	/* Promiscuous group :
+	 * One rule that forward all unmatched traffic from previous groups
+	 */
+	eth_zero_addr(dmac);
+	MLX5_SET(create_flow_group_in, flow_group_in, match_criteria_enable,
+		 MLX5_MATCH_MISC_PARAMETERS);
+	MLX5_SET_TO_ONES(fte_match_param, match_criteria, misc_parameters.source_port);
+	MLX5_SET(create_flow_group_in, flow_group_in, start_flow_index, table_size - 1);
+	MLX5_SET(create_flow_group_in, flow_group_in, end_flow_index, table_size - 1);
+	g = mlx5_create_flow_group(fdb, flow_group_in);
+	if (IS_ERR(g)) {
+		err = PTR_ERR(g);
+		esw_warn(dev, "Failed to create promisc flow group err(%d)\n", err);
+		goto out;
+	}
+	esw->fdb_table.legacy.promisc_grp = g;
+
+out:
+	if (err)
+		esw_destroy_legacy_fdb_table(esw);
+
+	kvfree(flow_group_in);
+	return err;
+}
+
+static void esw_destroy_legacy_vepa_table(struct mlx5_eswitch *esw)
+{
+	esw_debug(esw->dev, "Destroy VEPA Table\n");
+	if (!esw->fdb_table.legacy.vepa_fdb)
+		return;
+
+	mlx5_destroy_flow_table(esw->fdb_table.legacy.vepa_fdb);
+	esw->fdb_table.legacy.vepa_fdb = NULL;
+}
+
+static int esw_create_legacy_table(struct mlx5_eswitch *esw)
+{
+	int err;
+
+	memset(&esw->fdb_table.legacy, 0, sizeof(struct legacy_fdb));
+	atomic64_set(&esw->user_count, 0);
+
+	err = esw_create_legacy_vepa_table(esw);
+	if (err)
+		return err;
+
+	err = esw_create_legacy_fdb_table(esw);
+	if (err)
+		esw_destroy_legacy_vepa_table(esw);
+
+	return err;
+}
+
+static void esw_cleanup_vepa_rules(struct mlx5_eswitch *esw)
+{
+	if (esw->fdb_table.legacy.vepa_uplink_rule)
+		mlx5_del_flow_rules(esw->fdb_table.legacy.vepa_uplink_rule);
+
+	if (esw->fdb_table.legacy.vepa_star_rule)
+		mlx5_del_flow_rules(esw->fdb_table.legacy.vepa_star_rule);
+
+	esw->fdb_table.legacy.vepa_uplink_rule = NULL;
+	esw->fdb_table.legacy.vepa_star_rule = NULL;
+}
+
+static void esw_destroy_legacy_table(struct mlx5_eswitch *esw)
+{
+	esw_cleanup_vepa_rules(esw);
+	esw_destroy_legacy_fdb_table(esw);
+	esw_destroy_legacy_vepa_table(esw);
+}
+
+#define MLX5_LEGACY_SRIOV_VPORT_EVENTS (MLX5_VPORT_UC_ADDR_CHANGE | \
+					MLX5_VPORT_MC_ADDR_CHANGE | \
+					MLX5_VPORT_PROMISC_CHANGE)
+
+int esw_legacy_enable(struct mlx5_eswitch *esw)
+{
+	struct mlx5_vport *vport;
+	int ret, i;
+
+	ret = esw_create_legacy_table(esw);
+	if (ret)
+		return ret;
+
+	mlx5_esw_for_each_vf_vport(esw, i, vport, esw->esw_funcs.num_vfs)
+		vport->info.link_state = MLX5_VPORT_ADMIN_STATE_AUTO;
+
+	ret = mlx5_eswitch_enable_pf_vf_vports(esw, MLX5_LEGACY_SRIOV_VPORT_EVENTS);
+	if (ret)
+		esw_destroy_legacy_table(esw);
+	return ret;
+}
+
+void esw_legacy_disable(struct mlx5_eswitch *esw)
+{
+	struct esw_mc_addr *mc_promisc;
+
+	mlx5_eswitch_disable_pf_vf_vports(esw);
+
+	mc_promisc = &esw->mc_promisc;
+	if (mc_promisc->uplink_rule)
+		mlx5_del_flow_rules(mc_promisc->uplink_rule);
+
+	esw_destroy_legacy_table(esw);
+}
+
+static int _mlx5_eswitch_set_vepa_locked(struct mlx5_eswitch *esw,
+					 u8 setting)
+{
+	struct mlx5_flow_destination dest = {};
+	struct mlx5_flow_act flow_act = {};
+	struct mlx5_flow_handle *flow_rule;
+	struct mlx5_flow_spec *spec;
+	int err = 0;
+	void *misc;
+
+	if (!setting) {
+		esw_cleanup_vepa_rules(esw);
+		return 0;
+	}
+
+	if (esw->fdb_table.legacy.vepa_uplink_rule)
+		return 0;
+
+	spec = kvzalloc(sizeof(*spec), GFP_KERNEL);
+	if (!spec)
+		return -ENOMEM;
+
+	/* Uplink rule forward uplink traffic to FDB */
+	misc = MLX5_ADDR_OF(fte_match_param, spec->match_value, misc_parameters);
+	MLX5_SET(fte_match_set_misc, misc, source_port, MLX5_VPORT_UPLINK);
+
+	misc = MLX5_ADDR_OF(fte_match_param, spec->match_criteria, misc_parameters);
+	MLX5_SET_TO_ONES(fte_match_set_misc, misc, source_port);
+
+	spec->match_criteria_enable = MLX5_MATCH_MISC_PARAMETERS;
+	dest.type = MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE;
+	dest.ft = esw->fdb_table.legacy.fdb;
+	flow_act.action = MLX5_FLOW_CONTEXT_ACTION_FWD_DEST;
+	flow_rule = mlx5_add_flow_rules(esw->fdb_table.legacy.vepa_fdb, spec,
+					&flow_act, &dest, 1);
+	if (IS_ERR(flow_rule)) {
+		err = PTR_ERR(flow_rule);
+		goto out;
+	} else {
+		esw->fdb_table.legacy.vepa_uplink_rule = flow_rule;
+	}
+
+	/* Star rule to forward all traffic to uplink vport */
+	memset(&dest, 0, sizeof(dest));
+	dest.type = MLX5_FLOW_DESTINATION_TYPE_VPORT;
+	dest.vport.num = MLX5_VPORT_UPLINK;
+	flow_act.action = MLX5_FLOW_CONTEXT_ACTION_FWD_DEST;
+	flow_rule = mlx5_add_flow_rules(esw->fdb_table.legacy.vepa_fdb, NULL,
+					&flow_act, &dest, 1);
+	if (IS_ERR(flow_rule)) {
+		err = PTR_ERR(flow_rule);
+		goto out;
+	} else {
+		esw->fdb_table.legacy.vepa_star_rule = flow_rule;
+	}
+
+out:
+	kvfree(spec);
+	if (err)
+		esw_cleanup_vepa_rules(esw);
+	return err;
+}
+
+int mlx5_eswitch_set_vepa(struct mlx5_eswitch *esw, u8 setting)
+{
+	int err = 0;
+
+	if (!esw)
+		return -EOPNOTSUPP;
+
+	if (!mlx5_esw_allowed(esw))
+		return -EPERM;
+
+	mutex_lock(&esw->state_lock);
+	if (esw->mode != MLX5_ESWITCH_LEGACY) {
+		err = -EOPNOTSUPP;
+		goto out;
+	}
+
+	err = _mlx5_eswitch_set_vepa_locked(esw, setting);
+
+out:
+	mutex_unlock(&esw->state_lock);
+	return err;
+}
+
+int mlx5_eswitch_get_vepa(struct mlx5_eswitch *esw, u8 *setting)
+{
+	if (!esw)
+		return -EOPNOTSUPP;
+
+	if (!mlx5_esw_allowed(esw))
+		return -EPERM;
+
+	if (esw->mode != MLX5_ESWITCH_LEGACY)
+		return -EOPNOTSUPP;
+
+	*setting = esw->fdb_table.legacy.vepa_uplink_rule ? 1 : 0;
+	return 0;
+}
+
+int esw_legacy_vport_acl_setup(struct mlx5_eswitch *esw, struct mlx5_vport *vport)
+{
+	int ret;
+
+	/* Only non manager vports need ACL in legacy mode */
+	if (mlx5_esw_is_manager_vport(esw, vport->vport))
+		return 0;
+
+	ret = esw_acl_ingress_lgcy_setup(esw, vport);
+	if (ret)
+		goto ingress_err;
+
+	ret = esw_acl_egress_lgcy_setup(esw, vport);
+	if (ret)
+		goto egress_err;
+
+	return 0;
+
+egress_err:
+	esw_acl_ingress_lgcy_cleanup(esw, vport);
+ingress_err:
+	return ret;
+}
+
+void esw_legacy_vport_acl_cleanup(struct mlx5_eswitch *esw, struct mlx5_vport *vport)
+{
+	if (mlx5_esw_is_manager_vport(esw, vport->vport))
+		return;
+
+	esw_acl_egress_lgcy_cleanup(esw, vport);
+	esw_acl_ingress_lgcy_cleanup(esw, vport);
+}
+
+int mlx5_esw_query_vport_drop_stats(struct mlx5_core_dev *dev,
+				    struct mlx5_vport *vport,
+				    struct mlx5_vport_drop_stats *stats)
+{
+	u64 rx_discard_vport_down, tx_discard_vport_down;
+	struct mlx5_eswitch *esw = dev->priv.eswitch;
+	u64 bytes = 0;
+	int err = 0;
+
+	if (esw->mode != MLX5_ESWITCH_LEGACY)
+		return 0;
+
+	mutex_lock(&esw->state_lock);
+	if (!vport->enabled)
+		goto unlock;
+
+	if (!IS_ERR_OR_NULL(vport->egress.legacy.drop_counter))
+		mlx5_fc_query(dev, vport->egress.legacy.drop_counter,
+			      &stats->rx_dropped, &bytes);
+
+	if (vport->ingress.legacy.drop_counter)
+		mlx5_fc_query(dev, vport->ingress.legacy.drop_counter,
+			      &stats->tx_dropped, &bytes);
+
+	if (!MLX5_CAP_GEN(dev, receive_discard_vport_down) &&
+	    !MLX5_CAP_GEN(dev, transmit_discard_vport_down))
+		goto unlock;
+
+	err = mlx5_query_vport_down_stats(dev, vport->vport, 1,
+					  &rx_discard_vport_down,
+					  &tx_discard_vport_down);
+	if (err)
+		goto unlock;
+
+	if (MLX5_CAP_GEN(dev, receive_discard_vport_down))
+		stats->rx_dropped += rx_discard_vport_down;
+	if (MLX5_CAP_GEN(dev, transmit_discard_vport_down))
+		stats->tx_dropped += tx_discard_vport_down;
+
+unlock:
+	mutex_unlock(&esw->state_lock);
+	return err;
+}
+
+int mlx5_eswitch_set_vport_vlan(struct mlx5_eswitch *esw,
+				u16 vport, u16 vlan, u8 qos)
+{
+	u8 set_flags = 0;
+	int err = 0;
+
+	if (!mlx5_esw_allowed(esw))
+		return -EPERM;
+
+	if (vlan || qos)
+		set_flags = SET_VLAN_STRIP | SET_VLAN_INSERT;
+
+	mutex_lock(&esw->state_lock);
+	if (esw->mode != MLX5_ESWITCH_LEGACY) {
+		if (!vlan)
+			goto unlock; /* compatibility with libvirt */
+
+		err = -EOPNOTSUPP;
+		goto unlock;
+	}
+
+	err = __mlx5_eswitch_set_vport_vlan(esw, vport, vlan, qos, set_flags);
+
+unlock:
+	mutex_unlock(&esw->state_lock);
+	return err;
+}
+
+int mlx5_eswitch_set_vport_spoofchk(struct mlx5_eswitch *esw,
+				    u16 vport, bool spoofchk)
+{
+	struct mlx5_vport *evport = mlx5_eswitch_get_vport(esw, vport);
+	bool pschk;
+	int err = 0;
+
+	if (!mlx5_esw_allowed(esw))
+		return -EPERM;
+	if (IS_ERR(evport))
+		return PTR_ERR(evport);
+
+	mutex_lock(&esw->state_lock);
+	if (esw->mode != MLX5_ESWITCH_LEGACY) {
+		err = -EOPNOTSUPP;
+		goto unlock;
+	}
+	pschk = evport->info.spoofchk;
+	evport->info.spoofchk = spoofchk;
+	if (pschk && !is_valid_ether_addr(evport->info.mac))
+		mlx5_core_warn(esw->dev,
+			       "Spoofchk in set while MAC is invalid, vport(%d)\n",
+			       evport->vport);
+	if (evport->enabled && esw->mode == MLX5_ESWITCH_LEGACY)
+		err = esw_acl_ingress_lgcy_setup(esw, evport);
+	if (err)
+		evport->info.spoofchk = pschk;
+
+unlock:
+	mutex_unlock(&esw->state_lock);
+	return err;
+}
+
+int mlx5_eswitch_set_vport_trust(struct mlx5_eswitch *esw,
+				 u16 vport, bool setting)
+{
+	struct mlx5_vport *evport = mlx5_eswitch_get_vport(esw, vport);
+	int err = 0;
+
+	if (!mlx5_esw_allowed(esw))
+		return -EPERM;
+	if (IS_ERR(evport))
+		return PTR_ERR(evport);
+
+	mutex_lock(&esw->state_lock);
+	if (esw->mode != MLX5_ESWITCH_LEGACY) {
+		err = -EOPNOTSUPP;
+		goto unlock;
+	}
+	evport->info.trusted = setting;
+	if (evport->enabled)
+		esw_vport_change_handle_locked(evport);
+
+unlock:
+	mutex_unlock(&esw->state_lock);
+	return err;
+}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/esw/legacy.h b/drivers/net/ethernet/mellanox/mlx5/core/esw/legacy.h
new file mode 100644
index 000000000000..e0820bb72b57
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx5/core/esw/legacy.h
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/* Copyright (c) 2021 Mellanox Technologies Ltd */
+
+#ifndef __MLX5_ESW_LEGACY_H__
+#define __MLX5_ESW_LEGACY_H__
+
+#define MLX5_LEGACY_SRIOV_VPORT_EVENTS (MLX5_VPORT_UC_ADDR_CHANGE | \
+					MLX5_VPORT_MC_ADDR_CHANGE | \
+					MLX5_VPORT_PROMISC_CHANGE)
+
+struct mlx5_eswitch;
+
+int esw_legacy_enable(struct mlx5_eswitch *esw);
+void esw_legacy_disable(struct mlx5_eswitch *esw);
+
+int esw_legacy_vport_acl_setup(struct mlx5_eswitch *esw, struct mlx5_vport *vport);
+void esw_legacy_vport_acl_cleanup(struct mlx5_eswitch *esw, struct mlx5_vport *vport);
+
+int mlx5_esw_query_vport_drop_stats(struct mlx5_core_dev *dev,
+				    struct mlx5_vport *vport,
+				    struct mlx5_vport_drop_stats *stats);
+#endif