Date:   Tue, 14 Mar 2023 08:36:10 +0200
From:   Louis Peens <louis.peens@...igine.com>
To:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Simon Horman <simon.horman@...igine.com>, netdev@...r.kernel.org,
        oss-drivers@...igine.com
Subject: [PATCH net-next 6/6] nfp: flower: offload tc flows of multiple conntrack zones

From: Wentao Jia <wentao.jia@...igine.com>

If goto_chain action present in the post ct flow rule, merge flow rules
in this ct-zone, create a new pre_ct entry as the pre ct flow rule of
next ct-zone, but do not offload merged flow rules to firmware. Repeat
the process in the next ct-zone until no goto_chain action present in
the post ct flow rule in a certain ct-zone, merged all the flow rules.
Offload to firmware finally.

Signed-off-by: Wentao Jia <wentao.jia@...igine.com>
Acked-by: Simon Horman <simon.horman@...igine.com>
Signed-off-by: Louis Peens <louis.peens@...igine.com>
---
 .../ethernet/netronome/nfp/flower/conntrack.c | 145 +++++++++++++++---
 .../ethernet/netronome/nfp/flower/conntrack.h |  30 +++-
 .../ethernet/netronome/nfp/flower/offload.c   |   2 +-
 3 files changed, 154 insertions(+), 23 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/flower/conntrack.c b/drivers/net/ethernet/netronome/nfp/flower/conntrack.c
index ecffb6b0f3a1..73032173ac4e 100644
--- a/drivers/net/ethernet/netronome/nfp/flower/conntrack.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/conntrack.c
@@ -522,6 +522,21 @@ static int nfp_ct_check_vlan_merge(struct flow_action_entry *a_in,
 	return 0;
 }
 
+/* Extra check for multiple ct-zones merge
+ * currently surpport nft entries merge check in different zones
+ */
+static int nfp_ct_merge_extra_check(struct nfp_fl_ct_flow_entry *nft_entry,
+				    struct nfp_fl_ct_tc_merge *tc_m_entry)
+{
+	struct nfp_fl_nft_tc_merge *prev_nft_m_entry;
+	struct nfp_fl_ct_flow_entry *pre_ct_entry;
+
+	pre_ct_entry = tc_m_entry->pre_ct_parent;
+	prev_nft_m_entry = pre_ct_entry->prev_m_entries[pre_ct_entry->num_prev_m_entries - 1];
+
+	return nfp_ct_merge_check(prev_nft_m_entry->nft_parent, nft_entry);
+}
+
 static int nfp_ct_merge_act_check(struct nfp_fl_ct_flow_entry *pre_ct_entry,
 				  struct nfp_fl_ct_flow_entry *post_ct_entry,
 				  struct nfp_fl_ct_flow_entry *nft_entry)
@@ -796,27 +811,34 @@ static int nfp_fl_ct_add_offload(struct nfp_fl_nft_tc_merge *m_entry)
 {
 	enum nfp_flower_tun_type tun_type = NFP_FL_TUNNEL_NONE;
 	struct nfp_fl_ct_zone_entry *zt = m_entry->zt;
+	struct flow_rule *rules[NFP_MAX_ENTRY_RULES];
+	struct nfp_fl_ct_flow_entry *pre_ct_entry;
 	struct nfp_fl_key_ls key_layer, tmp_layer;
 	struct nfp_flower_priv *priv = zt->priv;
 	u16 key_map[_FLOW_PAY_LAYERS_MAX];
 	struct nfp_fl_payload *flow_pay;
-
-	struct flow_rule *rules[_CT_TYPE_MAX];
-	int num_rules = _CT_TYPE_MAX;
 	u8 *key, *msk, *kdata, *mdata;
 	struct nfp_port *port = NULL;
+	int num_rules, err, i, j = 0;
 	struct net_device *netdev;
 	bool qinq_sup;
 	u32 port_id;
 	u16 offset;
-	int i, err;
 
 	netdev = m_entry->netdev;
 	qinq_sup = !!(priv->flower_ext_feats & NFP_FL_FEATS_VLAN_QINQ);
 
-	rules[CT_TYPE_PRE_CT] = m_entry->tc_m_parent->pre_ct_parent->rule;
-	rules[CT_TYPE_NFT] = m_entry->nft_parent->rule;
-	rules[CT_TYPE_POST_CT] = m_entry->tc_m_parent->post_ct_parent->rule;
+	pre_ct_entry = m_entry->tc_m_parent->pre_ct_parent;
+	num_rules = pre_ct_entry->num_prev_m_entries * 2 + _CT_TYPE_MAX;
+
+	for (i = 0; i < pre_ct_entry->num_prev_m_entries; i++) {
+		rules[j++] = pre_ct_entry->prev_m_entries[i]->tc_m_parent->pre_ct_parent->rule;
+		rules[j++] = pre_ct_entry->prev_m_entries[i]->nft_parent->rule;
+	}
+
+	rules[j++] = m_entry->tc_m_parent->pre_ct_parent->rule;
+	rules[j++] = m_entry->nft_parent->rule;
+	rules[j++] = m_entry->tc_m_parent->post_ct_parent->rule;
 
 	memset(&key_layer, 0, sizeof(struct nfp_fl_key_ls));
 	memset(&key_map, 0, sizeof(key_map));
@@ -1181,6 +1203,12 @@ static int nfp_ct_do_nft_merge(struct nfp_fl_ct_zone_entry *zt,
 	if (err)
 		return err;
 
+	if (pre_ct_entry->num_prev_m_entries > 0) {
+		err = nfp_ct_merge_extra_check(nft_entry, tc_m_entry);
+		if (err)
+			return err;
+	}
+
 	/* Combine tc_merge and nft cookies for this cookie. */
 	new_cookie[0] = tc_m_entry->cookie[0];
 	new_cookie[1] = tc_m_entry->cookie[1];
@@ -1211,11 +1239,6 @@ static int nfp_ct_do_nft_merge(struct nfp_fl_ct_zone_entry *zt,
 	list_add(&nft_m_entry->tc_merge_list, &tc_m_entry->children);
 	list_add(&nft_m_entry->nft_flow_list, &nft_entry->children);
 
-	/* Generate offload structure and send to nfp */
-	err = nfp_fl_ct_add_offload(nft_m_entry);
-	if (err)
-		goto err_nft_ct_offload;
-
 	err = rhashtable_insert_fast(&zt->nft_merge_tb, &nft_m_entry->hash_node,
 				     nfp_nft_ct_merge_params);
 	if (err)
@@ -1223,12 +1246,20 @@ static int nfp_ct_do_nft_merge(struct nfp_fl_ct_zone_entry *zt,
 
 	zt->nft_merge_count++;
 
+	if (post_ct_entry->goto_chain_index > 0)
+		return nfp_fl_create_new_pre_ct(nft_m_entry);
+
+	/* Generate offload structure and send to nfp */
+	err = nfp_fl_ct_add_offload(nft_m_entry);
+	if (err)
+		goto err_nft_ct_offload;
+
 	return err;
 
-err_nft_ct_merge_insert:
+err_nft_ct_offload:
 	nfp_fl_ct_del_offload(zt->priv->app, nft_m_entry->tc_flower_cookie,
 			      nft_m_entry->netdev);
-err_nft_ct_offload:
+err_nft_ct_merge_insert:
 	list_del(&nft_m_entry->tc_merge_list);
 	list_del(&nft_m_entry->nft_flow_list);
 	kfree(nft_m_entry);
@@ -1474,7 +1505,7 @@ nfp_fl_ct_flow_entry *nfp_fl_ct_add_flow(struct nfp_fl_ct_zone_entry *zt,
 
 	entry->zt = zt;
 	entry->netdev = netdev;
-	entry->cookie = flow->cookie;
+	entry->cookie = flow->cookie > 0 ? flow->cookie : (unsigned long)entry;
 	entry->chain_index = flow->common.chain_index;
 	entry->tun_offset = NFP_FL_CT_NO_TUN;
 
@@ -1514,6 +1545,9 @@ nfp_fl_ct_flow_entry *nfp_fl_ct_add_flow(struct nfp_fl_ct_zone_entry *zt,
 
 	INIT_LIST_HEAD(&entry->children);
 
+	if (flow->cookie == 0)
+		return entry;
+
 	/* Now add a ct map entry to flower-priv */
 	map = get_hashentry(&zt->priv->ct_map_table, &flow->cookie,
 			    nfp_ct_map_params, sizeof(*map));
@@ -1572,6 +1606,14 @@ static void cleanup_nft_merge_entry(struct nfp_fl_nft_tc_merge *m_entry)
 	list_del(&m_entry->tc_merge_list);
 	list_del(&m_entry->nft_flow_list);
 
+	if (m_entry->next_pre_ct_entry) {
+		struct nfp_fl_ct_map_entry pre_ct_map_ent;
+
+		pre_ct_map_ent.ct_entry = m_entry->next_pre_ct_entry;
+		pre_ct_map_ent.cookie = 0;
+		nfp_fl_ct_del_flow(&pre_ct_map_ent);
+	}
+
 	kfree(m_entry);
 }
 
@@ -1742,7 +1784,8 @@ nfp_ct_merge_nft_with_tc(struct nfp_fl_ct_flow_entry *nft_entry,
 int nfp_fl_ct_handle_pre_ct(struct nfp_flower_priv *priv,
 			    struct net_device *netdev,
 			    struct flow_cls_offload *flow,
-			    struct netlink_ext_ack *extack)
+			    struct netlink_ext_ack *extack,
+			    struct nfp_fl_nft_tc_merge *m_entry)
 {
 	struct flow_action_entry *ct_act, *ct_goto;
 	struct nfp_fl_ct_flow_entry *ct_entry;
@@ -1787,6 +1830,20 @@ int nfp_fl_ct_handle_pre_ct(struct nfp_flower_priv *priv,
 	ct_entry->type = CT_TYPE_PRE_CT;
 	ct_entry->chain_index = flow->common.chain_index;
 	ct_entry->goto_chain_index = ct_goto->chain_index;
+
+	if (m_entry) {
+		struct nfp_fl_ct_flow_entry *pre_ct_entry;
+		int i;
+
+		pre_ct_entry = m_entry->tc_m_parent->pre_ct_parent;
+		for (i = 0; i < pre_ct_entry->num_prev_m_entries; i++)
+			ct_entry->prev_m_entries[i] = pre_ct_entry->prev_m_entries[i];
+		ct_entry->prev_m_entries[i++] = m_entry;
+		ct_entry->num_prev_m_entries = i;
+
+		m_entry->next_pre_ct_entry = ct_entry;
+	}
+
 	list_add(&ct_entry->list_node, &zt->pre_ct_list);
 	zt->pre_ct_count++;
 
@@ -1864,6 +1921,28 @@ int nfp_fl_ct_handle_post_ct(struct nfp_flower_priv *priv,
 	return 0;
 }
 
+int nfp_fl_create_new_pre_ct(struct nfp_fl_nft_tc_merge *m_entry)
+{
+	struct nfp_fl_ct_flow_entry *pre_ct_entry, *post_ct_entry;
+	struct flow_cls_offload new_pre_ct_flow;
+	int err;
+
+	pre_ct_entry = m_entry->tc_m_parent->pre_ct_parent;
+	if (pre_ct_entry->num_prev_m_entries >= NFP_MAX_RECIRC_CT_ZONES - 1)
+		return -1;
+
+	post_ct_entry = m_entry->tc_m_parent->post_ct_parent;
+	memset(&new_pre_ct_flow, 0, sizeof(struct flow_cls_offload));
+	new_pre_ct_flow.rule = post_ct_entry->rule;
+	new_pre_ct_flow.common.chain_index = post_ct_entry->chain_index;
+
+	err = nfp_fl_ct_handle_pre_ct(pre_ct_entry->zt->priv,
+				      pre_ct_entry->netdev,
+				      &new_pre_ct_flow, NULL,
+				      m_entry);
+	return err;
+}
+
 static void
 nfp_fl_ct_sub_stats(struct nfp_fl_nft_tc_merge *nft_merge,
 		    enum ct_entry_type type, u64 *m_pkts,
@@ -1909,6 +1988,32 @@ nfp_fl_ct_sub_stats(struct nfp_fl_nft_tc_merge *nft_merge,
 				  0, priv->stats[ctx_id].used,
 				  FLOW_ACTION_HW_STATS_DELAYED);
 	}
+
+	/* Update previous pre_ct/post_ct/nft flow stats */
+	if (nft_merge->tc_m_parent->pre_ct_parent->num_prev_m_entries > 0) {
+		struct nfp_fl_nft_tc_merge *tmp_nft_merge;
+		int i;
+
+		for (i = 0; i < nft_merge->tc_m_parent->pre_ct_parent->num_prev_m_entries; i++) {
+			tmp_nft_merge = nft_merge->tc_m_parent->pre_ct_parent->prev_m_entries[i];
+			flow_stats_update(&tmp_nft_merge->tc_m_parent->pre_ct_parent->stats,
+					  priv->stats[ctx_id].bytes,
+					  priv->stats[ctx_id].pkts,
+					  0, priv->stats[ctx_id].used,
+					  FLOW_ACTION_HW_STATS_DELAYED);
+			flow_stats_update(&tmp_nft_merge->tc_m_parent->post_ct_parent->stats,
+					  priv->stats[ctx_id].bytes,
+					  priv->stats[ctx_id].pkts,
+					  0, priv->stats[ctx_id].used,
+					  FLOW_ACTION_HW_STATS_DELAYED);
+			flow_stats_update(&tmp_nft_merge->nft_parent->stats,
+					  priv->stats[ctx_id].bytes,
+					  priv->stats[ctx_id].pkts,
+					  0, priv->stats[ctx_id].used,
+					  FLOW_ACTION_HW_STATS_DELAYED);
+		}
+	}
+
 	/* Reset stats from the nfp */
 	priv->stats[ctx_id].pkts = 0;
 	priv->stats[ctx_id].bytes = 0;
@@ -2113,10 +2218,12 @@ int nfp_fl_ct_del_flow(struct nfp_fl_ct_map_entry *ct_map_ent)
 	switch (ct_entry->type) {
 	case CT_TYPE_PRE_CT:
 		zt->pre_ct_count--;
-		rhashtable_remove_fast(m_table, &ct_map_ent->hash_node,
-				       nfp_ct_map_params);
+		if (ct_map_ent->cookie > 0)
+			rhashtable_remove_fast(m_table, &ct_map_ent->hash_node,
+					       nfp_ct_map_params);
 		nfp_fl_ct_clean_flow_entry(ct_entry);
-		kfree(ct_map_ent);
+		if (ct_map_ent->cookie > 0)
+			kfree(ct_map_ent);
 
 		if (!zt->pre_ct_count) {
 			zt->nft = NULL;
diff --git a/drivers/net/ethernet/netronome/nfp/flower/conntrack.h b/drivers/net/ethernet/netronome/nfp/flower/conntrack.h
index 9440ab776ece..c4ec78358033 100644
--- a/drivers/net/ethernet/netronome/nfp/flower/conntrack.h
+++ b/drivers/net/ethernet/netronome/nfp/flower/conntrack.h
@@ -86,6 +86,9 @@ enum ct_entry_type {
 	_CT_TYPE_MAX,
 };
 
+#define NFP_MAX_RECIRC_CT_ZONES 4
+#define NFP_MAX_ENTRY_RULES  (NFP_MAX_RECIRC_CT_ZONES * 2 + 1)
+
 enum nfp_nfp_layer_name {
 	FLOW_PAY_META_TCI =    0,
 	FLOW_PAY_INPORT,
@@ -114,27 +117,31 @@ enum nfp_nfp_layer_name {
  * @chain_index:	Chain index of the original flow
  * @goto_chain_index:	goto chain index of the flow
  * @netdev:	netdev structure.
- * @type:	Type of pre-entry from enum ct_entry_type
  * @zt:		Reference to the zone table this belongs to
  * @children:	List of tc_merge flows this flow forms part of
  * @rule:	Reference to the original TC flow rule
  * @stats:	Used to cache stats for updating
+ * @prev_m_entries:	Array of all previous nft_tc_merge entries
+ * @num_prev_m_entries:	The number of all previous nft_tc_merge entries
  * @tun_offset: Used to indicate tunnel action offset in action list
  * @flags:	Used to indicate flow flag like NAT which used by merge.
+ * @type:	Type of ct-entry from enum ct_entry_type
  */
 struct nfp_fl_ct_flow_entry {
 	unsigned long cookie;
 	struct list_head list_node;
 	u32 chain_index;
 	u32 goto_chain_index;
-	enum ct_entry_type type;
 	struct net_device *netdev;
 	struct nfp_fl_ct_zone_entry *zt;
 	struct list_head children;
 	struct flow_rule *rule;
 	struct flow_stats stats;
+	struct nfp_fl_nft_tc_merge *prev_m_entries[NFP_MAX_RECIRC_CT_ZONES - 1];
+	u8 num_prev_m_entries;
 	u8 tun_offset;		// Set to NFP_FL_CT_NO_TUN if no tun
 	u8 flags;
+	u8 type;
 };
 
 /**
@@ -171,6 +178,7 @@ struct nfp_fl_ct_tc_merge {
  * @nft_parent:	The nft_entry parent
  * @tc_flower_cookie:	The cookie of the flow offloaded to the nfp
  * @flow_pay:	Reference to the offloaded flow struct
+ * @next_pre_ct_entry:	Reference to the next ct zone pre ct entry
  */
 struct nfp_fl_nft_tc_merge {
 	struct net_device *netdev;
@@ -183,6 +191,7 @@ struct nfp_fl_nft_tc_merge {
 	struct nfp_fl_ct_flow_entry *nft_parent;
 	unsigned long tc_flower_cookie;
 	struct nfp_fl_payload *flow_pay;
+	struct nfp_fl_ct_flow_entry *next_pre_ct_entry;
 };
 
 /**
@@ -206,6 +215,7 @@ bool is_post_ct_flow(struct flow_cls_offload *flow);
  * @netdev:	netdev structure.
  * @flow:	TC flower classifier offload structure.
  * @extack:	Extack pointer for errors
+ * @m_entry:previous nfp_fl_nft_tc_merge entry
  *
  * Adds a new entry to the relevant zone table and tries to
  * merge with other +trk+est entries and offload if possible.
@@ -215,7 +225,8 @@ bool is_post_ct_flow(struct flow_cls_offload *flow);
 int nfp_fl_ct_handle_pre_ct(struct nfp_flower_priv *priv,
 			    struct net_device *netdev,
 			    struct flow_cls_offload *flow,
-			    struct netlink_ext_ack *extack);
+			    struct netlink_ext_ack *extack,
+			    struct nfp_fl_nft_tc_merge *m_entry);
 /**
  * nfp_fl_ct_handle_post_ct() - Handles +trk+est conntrack rules
  * @priv:	Pointer to app priv
@@ -233,6 +244,19 @@ int nfp_fl_ct_handle_post_ct(struct nfp_flower_priv *priv,
 			     struct flow_cls_offload *flow,
 			     struct netlink_ext_ack *extack);
 
+/**
+ * nfp_fl_create_new_pre_ct() - create next ct_zone -trk conntrack rules
+ * @m_entry:previous nfp_fl_nft_tc_merge entry
+ *
+ * Create a new pre_ct entry from previous nfp_fl_nft_tc_merge entry
+ * to the next relevant zone table. Try to merge with other +trk+est
+ * entries and offload if possible. The created new pre_ct entry is
+ * linked to the previous nfp_fl_nft_tc_merge entry.
+ *
+ * Return: negative value on error, 0 if configured successfully.
+ */
+int nfp_fl_create_new_pre_ct(struct nfp_fl_nft_tc_merge *m_entry);
+
 /**
  * nfp_fl_ct_clean_flow_entry() - Free a nfp_fl_ct_flow_entry
  * @entry:	Flow entry to cleanup
diff --git a/drivers/net/ethernet/netronome/nfp/flower/offload.c b/drivers/net/ethernet/netronome/nfp/flower/offload.c
index 8593cafa6368..18328eb7f5c3 100644
--- a/drivers/net/ethernet/netronome/nfp/flower/offload.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/offload.c
@@ -1344,7 +1344,7 @@ nfp_flower_add_offload(struct nfp_app *app, struct net_device *netdev,
 		port = nfp_port_from_netdev(netdev);
 
 	if (is_pre_ct_flow(flow))
-		return nfp_fl_ct_handle_pre_ct(priv, netdev, flow, extack);
+		return nfp_fl_ct_handle_pre_ct(priv, netdev, flow, extack, NULL);
 
 	if (is_post_ct_flow(flow))
 		return nfp_fl_ct_handle_post_ct(priv, netdev, flow, extack);
-- 
2.34.1

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