net/mlx5e: Use multi table support for CT and sample actions

CT and sample actions use post actions for their implementation.
Flag those actions as multi table actions so the post act infrastructure
will handle the post actions allocation.
Signed-off-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/ct.c

@@ -56,8 +56,20 @@ tc_act_parse_ct(struct mlx5e_tc_act_parse_state *parse_state,
 	return 0;
 }
 
+static bool
+tc_act_is_multi_table_act_ct(struct mlx5e_priv *priv,
+			     const struct flow_action_entry *act,
+			     struct mlx5_flow_attr *attr)
+{
+	if (act->ct.action & TCA_CT_ACT_CLEAR)
+		return false;
+
+	return true;
+}
+
 struct mlx5e_tc_act mlx5e_tc_act_ct = {
 	.can_offload = tc_act_can_offload_ct,
 	.parse_action = tc_act_parse_ct,
+	.is_multi_table_act = tc_act_is_multi_table_act_ct,
 };
 

drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/sample.c

@@ -4,6 +4,7 @@
 #include <net/psample.h>
 #include "act.h"
 #include "en/tc_priv.h"
+#include "en/tc/act/sample.h"
 
 static bool
 tc_act_can_offload_sample(struct mlx5e_tc_act_parse_state *parse_state,
@@ -42,7 +43,27 @@ tc_act_parse_sample(struct mlx5e_tc_act_parse_state *parse_state,
 	return 0;
 }
 
+bool
+mlx5e_tc_act_sample_is_multi_table(struct mlx5_core_dev *mdev,
+				   struct mlx5_flow_attr *attr)
+{
+	if (MLX5_CAP_GEN(mdev, reg_c_preserve) ||
+	    attr->action & MLX5_FLOW_CONTEXT_ACTION_DECAP)
+		return true;
+
+	return false;
+}
+
+static bool
+tc_act_is_multi_table_act_sample(struct mlx5e_priv *priv,
+				 const struct flow_action_entry *act,
+				 struct mlx5_flow_attr *attr)
+{
+	return mlx5e_tc_act_sample_is_multi_table(priv->mdev, attr);
+}
+
 struct mlx5e_tc_act mlx5e_tc_act_sample = {
 	.can_offload = tc_act_can_offload_sample,
 	.parse_action = tc_act_parse_sample,
+	.is_multi_table_act = tc_act_is_multi_table_act_sample,
 };

drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/sample.h

+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/* Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES. All rights reserved. */
+
+#ifndef __MLX5_EN_TC_ACT_SAMPLE_H__
+#define __MLX5_EN_TC_ACT_SAMPLE_H__
+
+#include <net/flow_offload.h>
+#include "en/tc_priv.h"
+
+bool
+mlx5e_tc_act_sample_is_multi_table(struct mlx5_core_dev *mdev,
+				   struct mlx5_flow_attr *attr);
+
+#endif /* __MLX5_EN_TC_ACT_SAMPLE_H__ */

drivers/net/ethernet/mellanox/mlx5/core/en/tc/post_act.c

@@ -126,8 +126,7 @@ mlx5e_tc_post_act_add(struct mlx5e_post_act *post_act, struct mlx5_flow_attr *at
 	post_attr->ft = post_act->ft;
 	post_attr->inner_match_level = MLX5_MATCH_NONE;
 	post_attr->outer_match_level = MLX5_MATCH_NONE;
-	post_attr->action &= ~(MLX5_FLOW_CONTEXT_ACTION_DECAP);
-	post_attr->flags &= ~MLX5_ATTR_FLAG_SAMPLE;
+	post_attr->action &= ~MLX5_FLOW_CONTEXT_ACTION_DECAP;
 
 	handle->ns_type = post_act->ns_type;
 	/* Splits were handled before post action */

drivers/net/ethernet/mellanox/mlx5/core/en/tc/sample.c

@@ -5,6 +5,7 @@
 #include <net/psample.h>
 #include "en/mapping.h"
 #include "en/tc/post_act.h"
+#include "en/tc/act/sample.h"
 #include "en/mod_hdr.h"
 #include "sample.h"
 #include "eswitch.h"
@@ -46,14 +47,12 @@ struct mlx5e_sample_flow {
 	struct mlx5_flow_handle *pre_rule;
 	struct mlx5_flow_attr *post_attr;
 	struct mlx5_flow_handle *post_rule;
-	struct mlx5e_post_act_handle *post_act_handle;
 };
 
 struct mlx5e_sample_restore {
 	struct hlist_node hlist;
 	struct mlx5_modify_hdr *modify_hdr;
 	struct mlx5_flow_handle *rule;
-	struct mlx5e_post_act_handle *post_act_handle;
 	u32 obj_id;
 	int count;
 };
@@ -231,69 +230,46 @@ sampler_put(struct mlx5e_tc_psample *tc_psample, struct mlx5e_sampler *sampler)
  */
 static struct mlx5_modify_hdr *
 sample_modify_hdr_get(struct mlx5_core_dev *mdev, u32 obj_id,
-		      struct mlx5e_post_act_handle *handle)
+		      struct mlx5e_tc_mod_hdr_acts *mod_acts)
 {
-	struct mlx5e_tc_mod_hdr_acts mod_acts = {};
 	struct mlx5_modify_hdr *modify_hdr;
 	int err;
 
-	err = mlx5e_tc_match_to_reg_set(mdev, &mod_acts, MLX5_FLOW_NAMESPACE_FDB,
+	err = mlx5e_tc_match_to_reg_set(mdev, mod_acts, MLX5_FLOW_NAMESPACE_FDB,
 					CHAIN_TO_REG, obj_id);
 	if (err)
 		goto err_set_regc0;
 
-	if (handle) {
-		err = mlx5e_tc_post_act_set_handle(mdev, handle, &mod_acts);
-		if (err)
-			goto err_post_act;
-	}
-
 	modify_hdr = mlx5_modify_header_alloc(mdev, MLX5_FLOW_NAMESPACE_FDB,
-					      mod_acts.num_actions,
-					      mod_acts.actions);
+					      mod_acts->num_actions,
+					      mod_acts->actions);
 	if (IS_ERR(modify_hdr)) {
 		err = PTR_ERR(modify_hdr);
 		goto err_modify_hdr;
 	}
 
-	mlx5e_mod_hdr_dealloc(&mod_acts);
+	mlx5e_mod_hdr_dealloc(mod_acts);
 	return modify_hdr;
 
 err_modify_hdr:
-err_post_act:
-	mlx5e_mod_hdr_dealloc(&mod_acts);
+	mlx5e_mod_hdr_dealloc(mod_acts);
 err_set_regc0:
 	return ERR_PTR(err);
 }
 
-static u32
-restore_hash(u32 obj_id, struct mlx5e_post_act_handle *post_act_handle)
-{
-	return jhash_2words(obj_id, hash32_ptr(post_act_handle), 0);
-}
-
-static bool
-restore_equal(struct mlx5e_sample_restore *restore, u32 obj_id,
-	      struct mlx5e_post_act_handle *post_act_handle)
-{
-	return restore->obj_id == obj_id && restore->post_act_handle == post_act_handle;
-}
-
 static struct mlx5e_sample_restore *
 sample_restore_get(struct mlx5e_tc_psample *tc_psample, u32 obj_id,
-		   struct mlx5e_post_act_handle *post_act_handle)
+		   struct mlx5e_tc_mod_hdr_acts *mod_acts)
 {
 	struct mlx5_eswitch *esw = tc_psample->esw;
 	struct mlx5_core_dev *mdev = esw->dev;
 	struct mlx5e_sample_restore *restore;
 	struct mlx5_modify_hdr *modify_hdr;
-	u32 hash_key;
 	int err;
 
 	mutex_lock(&tc_psample->restore_lock);
-	hash_key = restore_hash(obj_id, post_act_handle);
-	hash_for_each_possible(tc_psample->restore_hashtbl, restore, hlist, hash_key)
-		if (restore_equal(restore, obj_id, post_act_handle))
+	hash_for_each_possible(tc_psample->restore_hashtbl, restore, hlist, obj_id)
+		if (restore->obj_id == obj_id)
 			goto add_ref;
 
 	restore = kzalloc(sizeof(*restore), GFP_KERNEL);
@@ -302,9 +278,8 @@ sample_restore_get(struct mlx5e_tc_psample *tc_psample, u32 obj_id,
 		goto err_alloc;
 	}
 	restore->obj_id = obj_id;
-	restore->post_act_handle = post_act_handle;
 
-	modify_hdr = sample_modify_hdr_get(mdev, obj_id, post_act_handle);
+	modify_hdr = sample_modify_hdr_get(mdev, obj_id, mod_acts);
 	if (IS_ERR(modify_hdr)) {
 		err = PTR_ERR(modify_hdr);
 		goto err_modify_hdr;
@@ -317,7 +292,7 @@ sample_restore_get(struct mlx5e_tc_psample *tc_psample, u32 obj_id,
 		goto err_restore;
 	}
 
-	hash_add(tc_psample->restore_hashtbl, &restore->hlist, hash_key);
+	hash_add(tc_psample->restore_hashtbl, &restore->hlist, obj_id);
 add_ref:
 	restore->count++;
 	mutex_unlock(&tc_psample->restore_lock);
@@ -494,10 +469,10 @@ mlx5e_tc_sample_offload(struct mlx5e_tc_psample *tc_psample,
 			struct mlx5_flow_spec *spec,
 			struct mlx5_flow_attr *attr)
 {
-	struct mlx5e_post_act_handle *post_act_handle = NULL;
 	struct mlx5_esw_flow_attr *esw_attr = attr->esw_attr;
 	struct mlx5_esw_flow_attr *pre_esw_attr;
 	struct mlx5_mapped_obj restore_obj = {};
+	struct mlx5e_tc_mod_hdr_acts *mod_acts;
 	struct mlx5e_sample_flow *sample_flow;
 	struct mlx5e_sample_attr *sample_attr;
 	struct mlx5_flow_attr *pre_attr;
@@ -522,21 +497,11 @@ mlx5e_tc_sample_offload(struct mlx5e_tc_psample *tc_psample,
 	 * original flow table.
 	 */
 	esw = tc_psample->esw;
-	if (MLX5_CAP_GEN(esw->dev, reg_c_preserve) ||
-	    attr->action & MLX5_FLOW_CONTEXT_ACTION_DECAP) {
+	if (mlx5e_tc_act_sample_is_multi_table(esw->dev, attr)) {
 		struct mlx5_flow_table *ft;
 
 		ft = mlx5e_tc_post_act_get_ft(tc_psample->post_act);
 		default_tbl_id = ft->id;
-		post_act_handle = mlx5e_tc_post_act_add(tc_psample->post_act, attr);
-		if (IS_ERR(post_act_handle)) {
-			err = PTR_ERR(post_act_handle);
-			goto err_post_act;
-		}
-		err = mlx5e_tc_post_act_offload(tc_psample->post_act, post_act_handle);
-		if (err)
-			goto err_post_rule;
-		sample_flow->post_act_handle = post_act_handle;
 	} else {
 		err = add_post_rule(esw, sample_flow, spec, attr, &default_tbl_id);
 		if (err)
@@ -563,7 +528,8 @@ mlx5e_tc_sample_offload(struct mlx5e_tc_psample *tc_psample,
 	sample_attr->restore_obj_id = obj_id;
 
 	/* Create sample restore context. */
-	sample_flow->restore = sample_restore_get(tc_psample, obj_id, post_act_handle);
+	mod_acts = &attr->parse_attr->mod_hdr_acts;
+	sample_flow->restore = sample_restore_get(tc_psample, obj_id, mod_acts);
 	if (IS_ERR(sample_flow->restore)) {
 		err = PTR_ERR(sample_flow->restore);
 		goto err_sample_restore;
@@ -589,6 +555,7 @@ mlx5e_tc_sample_offload(struct mlx5e_tc_psample *tc_psample,
 	pre_attr->outer_match_level = attr->outer_match_level;
 	pre_attr->chain = attr->chain;
 	pre_attr->prio = attr->prio;
+	pre_attr->ft = attr->ft;
 	pre_attr->sample_attr = *sample_attr;
 	pre_esw_attr = pre_attr->esw_attr;
 	pre_esw_attr->in_mdev = esw_attr->in_mdev;
@@ -614,9 +581,6 @@ mlx5e_tc_sample_offload(struct mlx5e_tc_psample *tc_psample,
 	if (sample_flow->post_rule)
 		del_post_rule(esw, sample_flow, attr);
 err_post_rule:
-	if (post_act_handle)
-		mlx5e_tc_post_act_del(tc_psample->post_act, post_act_handle);
-err_post_act:
 	kfree(sample_flow);
 	return ERR_PTR(err);
 }
@@ -642,9 +606,7 @@ mlx5e_tc_sample_unoffload(struct mlx5e_tc_psample *tc_psample,
 	sample_restore_put(tc_psample, sample_flow->restore);
 	mapping_remove(esw->offloads.reg_c0_obj_pool, attr->sample_attr.restore_obj_id);
 	sampler_put(tc_psample, sample_flow->sampler);
-	if (sample_flow->post_act_handle)
-		mlx5e_tc_post_act_del(tc_psample->post_act, sample_flow->post_act_handle);
-	else
+	if (sample_flow->post_rule)
 		del_post_rule(esw, sample_flow, attr);
 
 	kfree(sample_flow->pre_attr);

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

@@ -18,6 +18,7 @@
 
 #include "lib/fs_chains.h"
 #include "en/tc_ct.h"
+#include "en/tc_priv.h"
 #include "en/mod_hdr.h"
 #include "en/mapping.h"
 #include "en/tc/post_act.h"
@@ -68,7 +69,6 @@ struct mlx5_tc_ct_priv {
 struct mlx5_ct_flow {
 	struct mlx5_flow_attr *pre_ct_attr;
 	struct mlx5_flow_handle *pre_ct_rule;
-	struct mlx5e_post_act_handle *post_act_handle;
 	struct mlx5_ct_ft *ft;
 	u32 chain_mapping;
 };
@@ -1756,7 +1756,7 @@ mlx5_tc_ct_del_ft_cb(struct mlx5_tc_ct_priv *ct_priv, struct mlx5_ct_ft *ft)
 /* We translate the tc filter with CT action to the following HW model:
  *
  * +---------------------+
- * + ft prio (tc chain) +
+ * + ft prio (tc chain)  +
  * + original match      +
  * +---------------------+
  *      | set chain miss mapping
@@ -1766,7 +1766,7 @@ mlx5_tc_ct_del_ft_cb(struct mlx5_tc_ct_priv *ct_priv, struct mlx5_ct_ft *ft)
  *      v
  * +---------------------+
  * + pre_ct/pre_ct_nat   +  if matches     +-------------------------+
- * + zone+nat match      +---------------->+ post_act (see below) +
+ * + zone+nat match      +---------------->+ post_act (see below)    +
  * +---------------------+  set zone       +-------------------------+
  *      | set zone
  *      v
@@ -1781,7 +1781,7 @@ mlx5_tc_ct_del_ft_cb(struct mlx5_tc_ct_priv *ct_priv, struct mlx5_ct_ft *ft)
  *      | do nat (if needed)
  *      v
  * +--------------+
- * + post_act  + original filter actions
+ * + post_act     + original filter actions
  * + fte_id match +------------------------>
  * +--------------+
  */
@@ -1792,9 +1792,8 @@ __mlx5_tc_ct_flow_offload(struct mlx5_tc_ct_priv *ct_priv,
 {
 	bool nat = attr->ct_attr.ct_action & TCA_CT_ACT_NAT;
 	struct mlx5e_priv *priv = netdev_priv(ct_priv->netdev);
-	struct mlx5e_tc_mod_hdr_acts pre_mod_acts = {};
+	struct mlx5e_tc_mod_hdr_acts *pre_mod_acts;
 	u32 attr_sz = ns_to_attr_sz(ct_priv->ns_type);
-	struct mlx5e_post_act_handle *handle;
 	struct mlx5_flow_attr *pre_ct_attr;
 	struct mlx5_modify_hdr *mod_hdr;
 	struct mlx5_ct_flow *ct_flow;
@@ -1817,17 +1816,6 @@ __mlx5_tc_ct_flow_offload(struct mlx5_tc_ct_priv *ct_priv,
 	}
 	ct_flow->ft = ft;
 
-	handle = mlx5e_tc_post_act_add(ct_priv->post_act, attr);
-	if (IS_ERR(handle)) {
-		err = PTR_ERR(handle);
-		ct_dbg("Failed to allocate post action handle");
-		goto err_post_act_handle;
-	}
-	err = mlx5e_tc_post_act_offload(ct_priv->post_act, handle);
-	if (err)
-		goto err_alloc_pre;
-	ct_flow->post_act_handle = handle;
-
 	/* Base flow attributes of both rules on original rule attribute */
 	ct_flow->pre_ct_attr = mlx5_alloc_flow_attr(ct_priv->ns_type);
 	if (!ct_flow->pre_ct_attr) {
@@ -1837,6 +1825,7 @@ __mlx5_tc_ct_flow_offload(struct mlx5_tc_ct_priv *ct_priv,
 
 	pre_ct_attr = ct_flow->pre_ct_attr;
 	memcpy(pre_ct_attr, attr, attr_sz);
+	pre_mod_acts = &pre_ct_attr->parse_attr->mod_hdr_acts;
 
 	/* Modify the original rule's action to fwd and modify, leave decap */
 	pre_ct_attr->action = attr->action & MLX5_FLOW_CONTEXT_ACTION_DECAP;
@@ -1855,25 +1844,19 @@ __mlx5_tc_ct_flow_offload(struct mlx5_tc_ct_priv *ct_priv,
 	}
 	ct_flow->chain_mapping = chain_mapping;
 
-	err = mlx5e_tc_match_to_reg_set(priv->mdev, &pre_mod_acts, ct_priv->ns_type,
+	err = mlx5e_tc_match_to_reg_set(priv->mdev, pre_mod_acts, ct_priv->ns_type,
 					CHAIN_TO_REG, chain_mapping);
 	if (err) {
 		ct_dbg("Failed to set chain register mapping");
 		goto err_mapping;
 	}
 
-	err = mlx5e_tc_post_act_set_handle(priv->mdev, handle, &pre_mod_acts);
-	if (err) {
-		ct_dbg("Failed to set post action handle");
-		goto err_mapping;
-	}
-
 	/* If original flow is decap, we do it before going into ct table
 	 * so add a rewrite for the tunnel match_id.
 	 */
 	if ((pre_ct_attr->action & MLX5_FLOW_CONTEXT_ACTION_DECAP) &&
 	    attr->chain == 0) {
-		err = mlx5e_tc_match_to_reg_set(priv->mdev, &pre_mod_acts,
+		err = mlx5e_tc_match_to_reg_set(priv->mdev, pre_mod_acts,
 						ct_priv->ns_type,
 						TUNNEL_TO_REG,
 						attr->tunnel_id);
@@ -1884,8 +1867,8 @@ __mlx5_tc_ct_flow_offload(struct mlx5_tc_ct_priv *ct_priv,
 	}
 
 	mod_hdr = mlx5_modify_header_alloc(priv->mdev, ct_priv->ns_type,
-					   pre_mod_acts.num_actions,
-					   pre_mod_acts.actions);
+					   pre_mod_acts->num_actions,
+					   pre_mod_acts->actions);
 	if (IS_ERR(mod_hdr)) {
 		err = PTR_ERR(mod_hdr);
 		ct_dbg("Failed to create pre ct mod hdr");
@@ -1905,20 +1888,18 @@ __mlx5_tc_ct_flow_offload(struct mlx5_tc_ct_priv *ct_priv,
 	}
 
 	attr->ct_attr.ct_flow = ct_flow;
-	mlx5e_mod_hdr_dealloc(&pre_mod_acts);
+	mlx5e_mod_hdr_dealloc(pre_mod_acts);
 
 	return ct_flow->pre_ct_rule;
 
 err_insert_orig:
 	mlx5_modify_header_dealloc(priv->mdev, pre_ct_attr->modify_hdr);
 err_mapping:
-	mlx5e_mod_hdr_dealloc(&pre_mod_acts);
+	mlx5e_mod_hdr_dealloc(pre_mod_acts);
 	mlx5_chains_put_chain_mapping(ct_priv->chains, ct_flow->chain_mapping);
 err_get_chain:
 	kfree(ct_flow->pre_ct_attr);
 err_alloc_pre:
-	mlx5e_tc_post_act_del(ct_priv->post_act, handle);
-err_post_act_handle:
 	mlx5_tc_ct_del_ft_cb(ct_priv, ft);
 err_ft:
 	kfree(ct_flow);
@@ -1955,11 +1936,8 @@ __mlx5_tc_ct_delete_flow(struct mlx5_tc_ct_priv *ct_priv,
 	mlx5_tc_rule_delete(priv, ct_flow->pre_ct_rule, pre_ct_attr);
 	mlx5_modify_header_dealloc(priv->mdev, pre_ct_attr->modify_hdr);
 
-	if (ct_flow->post_act_handle) {
-		mlx5_chains_put_chain_mapping(ct_priv->chains, ct_flow->chain_mapping);
-		mlx5e_tc_post_act_del(ct_priv->post_act, ct_flow->post_act_handle);
-		mlx5_tc_ct_del_ft_cb(ct_priv, ct_flow->ft);
-	}
+	mlx5_chains_put_chain_mapping(ct_priv->chains, ct_flow->chain_mapping);
+	mlx5_tc_ct_del_ft_cb(ct_priv, ct_flow->ft);
 
 	kfree(ct_flow->pre_ct_attr);
 	kfree(ct_flow);