kernel: improve mtk ppe flow accounting

Properly track L2 flows, and ensure that stale data gets cleared

Signed-off-by: Felix Fietkau <nbd@nbd.name>

3 files changed, 655 insertions, 0 deletions

diff --git a/target/linux/generic/pending-5.15/736-03-net-ethernet-mtk_eth_soc-improve-keeping-track-of-of.patch b/target/linux/generic/pending-5.15/736-03-net-ethernet-mtk_eth_soc-improve-keeping-track-of-of.patch
new file mode 100644
index 0000000000..f43d15d114
--- /dev/null
+++ b/target/linux/generic/pending-5.15/736-03-net-ethernet-mtk_eth_soc-improve-keeping-track-of-of.patch
@@ -0,0 +1,314 @@
+From: Felix Fietkau <nbd@nbd.name>
+Date: Thu, 23 Mar 2023 10:24:11 +0100
+Subject: [PATCH] net: ethernet: mtk_eth_soc: improve keeping track of
+ offloaded flows
+
+Unify tracking of L2 and L3 flows. Use the generic list field in struct
+mtk_foe_entry for tracking L2 subflows. Preparation for improving
+flow accounting support.
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- a/drivers/net/ethernet/mediatek/mtk_ppe.c
++++ b/drivers/net/ethernet/mediatek/mtk_ppe.c
+@@ -466,26 +466,30 @@ int mtk_foe_entry_set_queue(struct mtk_e
+ 	return 0;
+ }
+ 
++static int
++mtk_flow_entry_match_len(struct mtk_eth *eth, struct mtk_foe_entry *entry)
++{
++	int type = mtk_get_ib1_pkt_type(eth, entry->ib1);
++
++	if (type > MTK_PPE_PKT_TYPE_IPV4_DSLITE)
++		return offsetof(struct mtk_foe_entry, ipv6._rsv);
++	else
++		return offsetof(struct mtk_foe_entry, ipv4.ib2);
++}
++
+ static bool
+ mtk_flow_entry_match(struct mtk_eth *eth, struct mtk_flow_entry *entry,
+-		     struct mtk_foe_entry *data)
++		     struct mtk_foe_entry *data, int len)
+ {
+-	int type, len;
+-
+ 	if ((data->ib1 ^ entry->data.ib1) & MTK_FOE_IB1_UDP)
+ 		return false;
+ 
+-	type = mtk_get_ib1_pkt_type(eth, entry->data.ib1);
+-	if (type > MTK_PPE_PKT_TYPE_IPV4_DSLITE)
+-		len = offsetof(struct mtk_foe_entry, ipv6._rsv);
+-	else
+-		len = offsetof(struct mtk_foe_entry, ipv4.ib2);
+-
+ 	return !memcmp(&entry->data.data, &data->data, len - 4);
+ }
+ 
+ static void
+-__mtk_foe_entry_clear(struct mtk_ppe *ppe, struct mtk_flow_entry *entry)
++__mtk_foe_entry_clear(struct mtk_ppe *ppe, struct mtk_flow_entry *entry,
++		      bool set_state)
+ {
+ 	struct hlist_head *head;
+ 	struct hlist_node *tmp;
+@@ -495,13 +499,12 @@ __mtk_foe_entry_clear(struct mtk_ppe *pp
+ 				       mtk_flow_l2_ht_params);
+ 
+ 		head = &entry->l2_flows;
+-		hlist_for_each_entry_safe(entry, tmp, head, l2_data.list)
+-			__mtk_foe_entry_clear(ppe, entry);
++		hlist_for_each_entry_safe(entry, tmp, head, list)
++			__mtk_foe_entry_clear(ppe, entry, set_state);
+ 		return;
+ 	}
+ 
+-	hlist_del_init(&entry->list);
+-	if (entry->hash != 0xffff) {
++	if (entry->hash != 0xffff && set_state) {
+ 		struct mtk_foe_entry *hwe = mtk_foe_get_entry(ppe, entry->hash);
+ 
+ 		hwe->ib1 &= ~MTK_FOE_IB1_STATE;
+@@ -520,7 +523,7 @@ __mtk_foe_entry_clear(struct mtk_ppe *pp
+ 	if (entry->type != MTK_FLOW_TYPE_L2_SUBFLOW)
+ 		return;
+ 
+-	hlist_del_init(&entry->l2_data.list);
++	hlist_del_init(&entry->list);
+ 	kfree(entry);
+ }
+ 
+@@ -536,66 +539,55 @@ static int __mtk_foe_entry_idle_time(str
+ 		return now - timestamp;
+ }
+ 
++static bool
++mtk_flow_entry_update(struct mtk_ppe *ppe, struct mtk_flow_entry *entry)
++{
++	struct mtk_foe_entry foe = {};
++	struct mtk_foe_entry *hwe;
++	u16 hash = entry->hash;
++	int len;
++
++	if (hash == 0xffff)
++		return false;
++
++	hwe = mtk_foe_get_entry(ppe, hash);
++	len = mtk_flow_entry_match_len(ppe->eth, &entry->data);
++	memcpy(&foe, hwe, len);
++
++	if (!mtk_flow_entry_match(ppe->eth, entry, &foe, len) ||
++	    FIELD_GET(MTK_FOE_IB1_STATE, foe.ib1) != MTK_FOE_STATE_BIND)
++		return false;
++
++	entry->data.ib1 = foe.ib1;
++
++	return true;
++}
++
+ static void
+ mtk_flow_entry_update_l2(struct mtk_ppe *ppe, struct mtk_flow_entry *entry)
+ {
+ 	u32 ib1_ts_mask = mtk_get_ib1_ts_mask(ppe->eth);
+ 	struct mtk_flow_entry *cur;
+-	struct mtk_foe_entry *hwe;
+ 	struct hlist_node *tmp;
+ 	int idle;
+ 
+ 	idle = __mtk_foe_entry_idle_time(ppe, entry->data.ib1);
+-	hlist_for_each_entry_safe(cur, tmp, &entry->l2_flows, l2_data.list) {
++	hlist_for_each_entry_safe(cur, tmp, &entry->l2_flows, list) {
+ 		int cur_idle;
+-		u32 ib1;
+-
+-		hwe = mtk_foe_get_entry(ppe, cur->hash);
+-		ib1 = READ_ONCE(hwe->ib1);
+ 
+-		if (FIELD_GET(MTK_FOE_IB1_STATE, ib1) != MTK_FOE_STATE_BIND) {
+-			cur->hash = 0xffff;
+-			__mtk_foe_entry_clear(ppe, cur);
++		if (!mtk_flow_entry_update(ppe, cur)) {
++			__mtk_foe_entry_clear(ppe, entry, false);
+ 			continue;
+ 		}
+ 
+-		cur_idle = __mtk_foe_entry_idle_time(ppe, ib1);
++		cur_idle = __mtk_foe_entry_idle_time(ppe, cur->data.ib1);
+ 		if (cur_idle >= idle)
+ 			continue;
+ 
+ 		idle = cur_idle;
+ 		entry->data.ib1 &= ~ib1_ts_mask;
+-		entry->data.ib1 |= hwe->ib1 & ib1_ts_mask;
+-	}
+-}
+-
+-static void
+-mtk_flow_entry_update(struct mtk_ppe *ppe, struct mtk_flow_entry *entry)
+-{
+-	struct mtk_foe_entry foe = {};
+-	struct mtk_foe_entry *hwe;
+-
+-	spin_lock_bh(&ppe_lock);
+-
+-	if (entry->type == MTK_FLOW_TYPE_L2) {
+-		mtk_flow_entry_update_l2(ppe, entry);
+-		goto out;
++		entry->data.ib1 |= cur->data.ib1 & ib1_ts_mask;
+ 	}
+-
+-	if (entry->hash == 0xffff)
+-		goto out;
+-
+-	hwe = mtk_foe_get_entry(ppe, entry->hash);
+-	memcpy(&foe, hwe, ppe->eth->soc->foe_entry_size);
+-	if (!mtk_flow_entry_match(ppe->eth, entry, &foe)) {
+-		entry->hash = 0xffff;
+-		goto out;
+-	}
+-
+-	entry->data.ib1 = foe.ib1;
+-
+-out:
+-	spin_unlock_bh(&ppe_lock);
+ }
+ 
+ static void
+@@ -632,7 +624,8 @@ __mtk_foe_entry_commit(struct mtk_ppe *p
+ void mtk_foe_entry_clear(struct mtk_ppe *ppe, struct mtk_flow_entry *entry)
+ {
+ 	spin_lock_bh(&ppe_lock);
+-	__mtk_foe_entry_clear(ppe, entry);
++	__mtk_foe_entry_clear(ppe, entry, true);
++	hlist_del_init(&entry->list);
+ 	spin_unlock_bh(&ppe_lock);
+ }
+ 
+@@ -679,8 +672,8 @@ mtk_foe_entry_commit_subflow(struct mtk_
+ {
+ 	const struct mtk_soc_data *soc = ppe->eth->soc;
+ 	struct mtk_flow_entry *flow_info;
+-	struct mtk_foe_entry foe = {}, *hwe;
+ 	struct mtk_foe_mac_info *l2;
++	struct mtk_foe_entry *hwe;
+ 	u32 ib1_mask = mtk_get_ib1_pkt_type_mask(ppe->eth) | MTK_FOE_IB1_UDP;
+ 	int type;
+ 
+@@ -688,30 +681,30 @@ mtk_foe_entry_commit_subflow(struct mtk_
+ 	if (!flow_info)
+ 		return;
+ 
+-	flow_info->l2_data.base_flow = entry;
+ 	flow_info->type = MTK_FLOW_TYPE_L2_SUBFLOW;
+ 	flow_info->hash = hash;
+ 	hlist_add_head(&flow_info->list,
+ 		       &ppe->foe_flow[hash / soc->hash_offset]);
+-	hlist_add_head(&flow_info->l2_data.list, &entry->l2_flows);
++	hlist_add_head(&flow_info->list, &entry->l2_flows);
+ 
+ 	hwe = mtk_foe_get_entry(ppe, hash);
+-	memcpy(&foe, hwe, soc->foe_entry_size);
+-	foe.ib1 &= ib1_mask;
+-	foe.ib1 |= entry->data.ib1 & ~ib1_mask;
++	memcpy(&flow_info->data, hwe, soc->foe_entry_size);
++	flow_info->data.ib1 &= ib1_mask;
++	flow_info->data.ib1 |= entry->data.ib1 & ~ib1_mask;
+ 
+-	l2 = mtk_foe_entry_l2(ppe->eth, &foe);
++	l2 = mtk_foe_entry_l2(ppe->eth, &flow_info->data);
+ 	memcpy(l2, &entry->data.bridge.l2, sizeof(*l2));
+ 
+-	type = mtk_get_ib1_pkt_type(ppe->eth, foe.ib1);
++	type = mtk_get_ib1_pkt_type(ppe->eth, flow_info->data.ib1);
+ 	if (type == MTK_PPE_PKT_TYPE_IPV4_HNAPT)
+-		memcpy(&foe.ipv4.new, &foe.ipv4.orig, sizeof(foe.ipv4.new));
++		memcpy(&flow_info->data.ipv4.new, &flow_info->data.ipv4.orig,
++		       sizeof(flow_info->data.ipv4.new));
+ 	else if (type >= MTK_PPE_PKT_TYPE_IPV6_ROUTE_3T && l2->etype == ETH_P_IP)
+ 		l2->etype = ETH_P_IPV6;
+ 
+-	*mtk_foe_entry_ib2(ppe->eth, &foe) = entry->data.bridge.ib2;
++	*mtk_foe_entry_ib2(ppe->eth, &flow_info->data) = entry->data.bridge.ib2;
+ 
+-	__mtk_foe_entry_commit(ppe, &foe, hash);
++	__mtk_foe_entry_commit(ppe, &flow_info->data, hash);
+ }
+ 
+ void __mtk_ppe_check_skb(struct mtk_ppe *ppe, struct sk_buff *skb, u16 hash)
+@@ -721,9 +714,11 @@ void __mtk_ppe_check_skb(struct mtk_ppe
+ 	struct mtk_foe_entry *hwe = mtk_foe_get_entry(ppe, hash);
+ 	struct mtk_flow_entry *entry;
+ 	struct mtk_foe_bridge key = {};
++	struct mtk_foe_entry foe = {};
+ 	struct hlist_node *n;
+ 	struct ethhdr *eh;
+ 	bool found = false;
++	int entry_len;
+ 	u8 *tag;
+ 
+ 	spin_lock_bh(&ppe_lock);
+@@ -731,20 +726,14 @@ void __mtk_ppe_check_skb(struct mtk_ppe
+ 	if (FIELD_GET(MTK_FOE_IB1_STATE, hwe->ib1) == MTK_FOE_STATE_BIND)
+ 		goto out;
+ 
+-	hlist_for_each_entry_safe(entry, n, head, list) {
+-		if (entry->type == MTK_FLOW_TYPE_L2_SUBFLOW) {
+-			if (unlikely(FIELD_GET(MTK_FOE_IB1_STATE, hwe->ib1) ==
+-				     MTK_FOE_STATE_BIND))
+-				continue;
+-
+-			entry->hash = 0xffff;
+-			__mtk_foe_entry_clear(ppe, entry);
+-			continue;
+-		}
++	entry_len = mtk_flow_entry_match_len(ppe->eth, hwe);
++	memcpy(&foe, hwe, entry_len);
+ 
+-		if (found || !mtk_flow_entry_match(ppe->eth, entry, hwe)) {
++	hlist_for_each_entry_safe(entry, n, head, list) {
++		if (found ||
++		    !mtk_flow_entry_match(ppe->eth, entry, &foe, entry_len)) {
+ 			if (entry->hash != 0xffff)
+-				entry->hash = 0xffff;
++				__mtk_foe_entry_clear(ppe, entry, false);
+ 			continue;
+ 		}
+ 
+@@ -795,9 +784,17 @@ out:
+ 
+ int mtk_foe_entry_idle_time(struct mtk_ppe *ppe, struct mtk_flow_entry *entry)
+ {
+-	mtk_flow_entry_update(ppe, entry);
++	int idle;
++
++	spin_lock_bh(&ppe_lock);
++	if (entry->type == MTK_FLOW_TYPE_L2)
++		mtk_flow_entry_update_l2(ppe, entry);
++	else
++		mtk_flow_entry_update(ppe, entry);
++	idle = __mtk_foe_entry_idle_time(ppe, entry->data.ib1);
++	spin_unlock_bh(&ppe_lock);
+ 
+-	return __mtk_foe_entry_idle_time(ppe, entry->data.ib1);
++	return idle;
+ }
+ 
+ int mtk_ppe_prepare_reset(struct mtk_ppe *ppe)
+--- a/drivers/net/ethernet/mediatek/mtk_ppe.h
++++ b/drivers/net/ethernet/mediatek/mtk_ppe.h
+@@ -275,13 +275,7 @@ struct mtk_flow_entry {
+ 	s8 wed_index;
+ 	u8 ppe_index;
+ 	u16 hash;
+-	union {
+-		struct mtk_foe_entry data;
+-		struct {
+-			struct mtk_flow_entry *base_flow;
+-			struct hlist_node list;
+-		} l2_data;
+-	};
++	struct mtk_foe_entry data;
+ 	struct rhash_head node;
+ 	unsigned long cookie;
+ };
diff --git a/target/linux/generic/pending-5.15/736-04-net-ethernet-mediatek-fix-ppe-flow-accounting-for-L2.patch b/target/linux/generic/pending-5.15/736-04-net-ethernet-mediatek-fix-ppe-flow-accounting-for-L2.patch
new file mode 100644
index 0000000000..888ecc9b61
--- /dev/null
+++ b/target/linux/generic/pending-5.15/736-04-net-ethernet-mediatek-fix-ppe-flow-accounting-for-L2.patch
@@ -0,0 +1,320 @@
+From: Felix Fietkau <nbd@nbd.name>
+Date: Thu, 23 Mar 2023 11:05:22 +0100
+Subject: [PATCH] net: ethernet: mediatek: fix ppe flow accounting for L2
+ flows
+
+For L2 flows, the packet/byte counters should report the sum of the
+counters of their subflows, both current and expired.
+In order to make this work, change the way that accounting data is tracked.
+Reset counters when a flow enters bind. Once it expires (or enters unbind),
+store the last counter value in struct mtk_flow_entry.
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- a/drivers/net/ethernet/mediatek/mtk_ppe.c
++++ b/drivers/net/ethernet/mediatek/mtk_ppe.c
+@@ -80,9 +80,9 @@ static int mtk_ppe_mib_wait_busy(struct
+ 	int ret;
+ 	u32 val;
+ 
+-	ret = readl_poll_timeout(ppe->base + MTK_PPE_MIB_SER_CR, val,
+-				 !(val & MTK_PPE_MIB_SER_CR_ST),
+-				 20, MTK_PPE_WAIT_TIMEOUT_US);
++	ret = readl_poll_timeout_atomic(ppe->base + MTK_PPE_MIB_SER_CR, val,
++					!(val & MTK_PPE_MIB_SER_CR_ST),
++					20, MTK_PPE_WAIT_TIMEOUT_US);
+ 
+ 	if (ret)
+ 		dev_err(ppe->dev, "MIB table busy");
+@@ -90,18 +90,32 @@ static int mtk_ppe_mib_wait_busy(struct
+ 	return ret;
+ }
+ 
+-static int mtk_mib_entry_read(struct mtk_ppe *ppe, u16 index, u64 *bytes, u64 *packets)
++static inline struct mtk_foe_accounting *
++mtk_ppe_acct_data(struct mtk_ppe *ppe, u16 index)
++{
++	if (!ppe->acct_table)
++		return NULL;
++
++	return ppe->acct_table + index * sizeof(struct mtk_foe_accounting);
++}
++
++struct mtk_foe_accounting *mtk_ppe_mib_entry_read(struct mtk_ppe *ppe, u16 index)
+ {
+ 	u32 byte_cnt_low, byte_cnt_high, pkt_cnt_low, pkt_cnt_high;
+ 	u32 val, cnt_r0, cnt_r1, cnt_r2;
++	struct mtk_foe_accounting *acct;
+ 	int ret;
+ 
+ 	val = FIELD_PREP(MTK_PPE_MIB_SER_CR_ADDR, index) | MTK_PPE_MIB_SER_CR_ST;
+ 	ppe_w32(ppe, MTK_PPE_MIB_SER_CR, val);
+ 
++	acct = mtk_ppe_acct_data(ppe, index);
++	if (!acct)
++		return NULL;
++
+ 	ret = mtk_ppe_mib_wait_busy(ppe);
+ 	if (ret)
+-		return ret;
++		return acct;
+ 
+ 	cnt_r0 = readl(ppe->base + MTK_PPE_MIB_SER_R0);
+ 	cnt_r1 = readl(ppe->base + MTK_PPE_MIB_SER_R1);
+@@ -111,10 +125,11 @@ static int mtk_mib_entry_read(struct mtk
+ 	byte_cnt_high = FIELD_GET(MTK_PPE_MIB_SER_R1_BYTE_CNT_HIGH, cnt_r1);
+ 	pkt_cnt_low = FIELD_GET(MTK_PPE_MIB_SER_R1_PKT_CNT_LOW, cnt_r1);
+ 	pkt_cnt_high = FIELD_GET(MTK_PPE_MIB_SER_R2_PKT_CNT_HIGH, cnt_r2);
+-	*bytes = ((u64)byte_cnt_high << 32) | byte_cnt_low;
+-	*packets = (pkt_cnt_high << 16) | pkt_cnt_low;
+ 
+-	return 0;
++	acct->bytes += ((u64)byte_cnt_high << 32) | byte_cnt_low;
++	acct->packets += (pkt_cnt_high << 16) | pkt_cnt_low;
++
++	return acct;
+ }
+ 
+ static void mtk_ppe_cache_clear(struct mtk_ppe *ppe)
+@@ -510,13 +525,6 @@ __mtk_foe_entry_clear(struct mtk_ppe *pp
+ 		hwe->ib1 &= ~MTK_FOE_IB1_STATE;
+ 		hwe->ib1 |= FIELD_PREP(MTK_FOE_IB1_STATE, MTK_FOE_STATE_INVALID);
+ 		dma_wmb();
+-		if (ppe->accounting) {
+-			struct mtk_foe_accounting *acct;
+-
+-			acct = ppe->acct_table + entry->hash * sizeof(*acct);
+-			acct->packets = 0;
+-			acct->bytes = 0;
+-		}
+ 	}
+ 	entry->hash = 0xffff;
+ 
+@@ -540,8 +548,10 @@ static int __mtk_foe_entry_idle_time(str
+ }
+ 
+ static bool
+-mtk_flow_entry_update(struct mtk_ppe *ppe, struct mtk_flow_entry *entry)
++mtk_flow_entry_update(struct mtk_ppe *ppe, struct mtk_flow_entry *entry,
++		      u64 *packets, u64 *bytes)
+ {
++	struct mtk_foe_accounting *acct;
+ 	struct mtk_foe_entry foe = {};
+ 	struct mtk_foe_entry *hwe;
+ 	u16 hash = entry->hash;
+@@ -555,16 +565,29 @@ mtk_flow_entry_update(struct mtk_ppe *pp
+ 	memcpy(&foe, hwe, len);
+ 
+ 	if (!mtk_flow_entry_match(ppe->eth, entry, &foe, len) ||
+-	    FIELD_GET(MTK_FOE_IB1_STATE, foe.ib1) != MTK_FOE_STATE_BIND)
++	    FIELD_GET(MTK_FOE_IB1_STATE, foe.ib1) != MTK_FOE_STATE_BIND) {
++		acct = mtk_ppe_acct_data(ppe, hash);
++		if (acct) {
++			entry->packets += acct->packets;
++			entry->bytes += acct->bytes;
++		}
++
+ 		return false;
++	}
+ 
+ 	entry->data.ib1 = foe.ib1;
++	acct = mtk_ppe_mib_entry_read(ppe, hash);
++	if (acct) {
++		*packets += acct->packets;
++		*bytes += acct->bytes;
++	}
+ 
+ 	return true;
+ }
+ 
+ static void
+-mtk_flow_entry_update_l2(struct mtk_ppe *ppe, struct mtk_flow_entry *entry)
++mtk_flow_entry_update_l2(struct mtk_ppe *ppe, struct mtk_flow_entry *entry,
++			 u64 *packets, u64 *bytes)
+ {
+ 	u32 ib1_ts_mask = mtk_get_ib1_ts_mask(ppe->eth);
+ 	struct mtk_flow_entry *cur;
+@@ -575,7 +598,9 @@ mtk_flow_entry_update_l2(struct mtk_ppe
+ 	hlist_for_each_entry_safe(cur, tmp, &entry->l2_flows, list) {
+ 		int cur_idle;
+ 
+-		if (!mtk_flow_entry_update(ppe, cur)) {
++		if (!mtk_flow_entry_update(ppe, cur, packets, bytes)) {
++			entry->packets += cur->packets;
++			entry->bytes += cur->bytes;
+ 			__mtk_foe_entry_clear(ppe, entry, false);
+ 			continue;
+ 		}
+@@ -590,10 +615,31 @@ mtk_flow_entry_update_l2(struct mtk_ppe
+ 	}
+ }
+ 
++void mtk_foe_entry_get_stats(struct mtk_ppe *ppe, struct mtk_flow_entry *entry,
++			     int *idle, u64 *packets, u64 *bytes)
++{
++	*packets = 0;
++	*bytes = 0;
++
++	spin_lock_bh(&ppe_lock);
++
++	if (entry->type == MTK_FLOW_TYPE_L2)
++		mtk_flow_entry_update_l2(ppe, entry, packets, bytes);
++	else
++		mtk_flow_entry_update(ppe, entry, packets, bytes);
++
++	*packets += entry->packets;
++	*bytes += entry->bytes;
++	*idle = __mtk_foe_entry_idle_time(ppe, entry->data.ib1);
++
++	spin_unlock_bh(&ppe_lock);
++}
++
+ static void
+ __mtk_foe_entry_commit(struct mtk_ppe *ppe, struct mtk_foe_entry *entry,
+ 		       u16 hash)
+ {
++	struct mtk_foe_accounting *acct;
+ 	struct mtk_eth *eth = ppe->eth;
+ 	u16 timestamp = mtk_eth_timestamp(eth);
+ 	struct mtk_foe_entry *hwe;
+@@ -618,6 +664,12 @@ __mtk_foe_entry_commit(struct mtk_ppe *p
+ 
+ 	dma_wmb();
+ 
++	acct = mtk_ppe_mib_entry_read(ppe, hash);
++	if (acct) {
++		acct->packets = 0;
++		acct->bytes = 0;
++	}
++
+ 	mtk_ppe_cache_clear(ppe);
+ }
+ 
+@@ -782,21 +834,6 @@ out:
+ 	spin_unlock_bh(&ppe_lock);
+ }
+ 
+-int mtk_foe_entry_idle_time(struct mtk_ppe *ppe, struct mtk_flow_entry *entry)
+-{
+-	int idle;
+-
+-	spin_lock_bh(&ppe_lock);
+-	if (entry->type == MTK_FLOW_TYPE_L2)
+-		mtk_flow_entry_update_l2(ppe, entry);
+-	else
+-		mtk_flow_entry_update(ppe, entry);
+-	idle = __mtk_foe_entry_idle_time(ppe, entry->data.ib1);
+-	spin_unlock_bh(&ppe_lock);
+-
+-	return idle;
+-}
+-
+ int mtk_ppe_prepare_reset(struct mtk_ppe *ppe)
+ {
+ 	if (!ppe)
+@@ -824,32 +861,6 @@ int mtk_ppe_prepare_reset(struct mtk_ppe
+ 	return mtk_ppe_wait_busy(ppe);
+ }
+ 
+-struct mtk_foe_accounting *mtk_foe_entry_get_mib(struct mtk_ppe *ppe, u32 index,
+-						 struct mtk_foe_accounting *diff)
+-{
+-	struct mtk_foe_accounting *acct;
+-	int size = sizeof(struct mtk_foe_accounting);
+-	u64 bytes, packets;
+-
+-	if (!ppe->accounting)
+-		return NULL;
+-
+-	if (mtk_mib_entry_read(ppe, index, &bytes, &packets))
+-		return NULL;
+-
+-	acct = ppe->acct_table + index * size;
+-
+-	acct->bytes += bytes;
+-	acct->packets += packets;
+-
+-	if (diff) {
+-		diff->bytes = bytes;
+-		diff->packets = packets;
+-	}
+-
+-	return acct;
+-}
+-
+ struct mtk_ppe *mtk_ppe_init(struct mtk_eth *eth, void __iomem *base, int index)
+ {
+ 	bool accounting = eth->soc->has_accounting;
+--- a/drivers/net/ethernet/mediatek/mtk_ppe.h
++++ b/drivers/net/ethernet/mediatek/mtk_ppe.h
+@@ -278,6 +278,8 @@ struct mtk_flow_entry {
+ 	struct mtk_foe_entry data;
+ 	struct rhash_head node;
+ 	unsigned long cookie;
++	u64 packets;
++	u64 bytes;
+ };
+ 
+ struct mtk_mib_entry {
+@@ -320,6 +322,7 @@ struct mtk_ppe *mtk_ppe_init(struct mtk_
+ void mtk_ppe_start(struct mtk_ppe *ppe);
+ int mtk_ppe_stop(struct mtk_ppe *ppe);
+ int mtk_ppe_prepare_reset(struct mtk_ppe *ppe);
++struct mtk_foe_accounting *mtk_ppe_mib_entry_read(struct mtk_ppe *ppe, u16 index);
+ 
+ void __mtk_ppe_check_skb(struct mtk_ppe *ppe, struct sk_buff *skb, u16 hash);
+ 
+@@ -368,9 +371,8 @@ int mtk_foe_entry_set_queue(struct mtk_e
+ 			    unsigned int queue);
+ int mtk_foe_entry_commit(struct mtk_ppe *ppe, struct mtk_flow_entry *entry);
+ void mtk_foe_entry_clear(struct mtk_ppe *ppe, struct mtk_flow_entry *entry);
+-int mtk_foe_entry_idle_time(struct mtk_ppe *ppe, struct mtk_flow_entry *entry);
+ int mtk_ppe_debugfs_init(struct mtk_ppe *ppe, int index);
+-struct mtk_foe_accounting *mtk_foe_entry_get_mib(struct mtk_ppe *ppe, u32 index,
+-						 struct mtk_foe_accounting *diff);
++void mtk_foe_entry_get_stats(struct mtk_ppe *ppe, struct mtk_flow_entry *entry,
++			     int *idle, u64 *packets, u64 *bytes);
+ 
+ #endif
+--- a/drivers/net/ethernet/mediatek/mtk_ppe_debugfs.c
++++ b/drivers/net/ethernet/mediatek/mtk_ppe_debugfs.c
+@@ -96,7 +96,7 @@ mtk_ppe_debugfs_foe_show(struct seq_file
+ 		if (bind && state != MTK_FOE_STATE_BIND)
+ 			continue;
+ 
+-		acct = mtk_foe_entry_get_mib(ppe, i, NULL);
++		acct = mtk_ppe_mib_entry_read(ppe, i);
+ 
+ 		type = FIELD_GET(MTK_FOE_IB1_PACKET_TYPE, entry->ib1);
+ 		seq_printf(m, "%05x %s %7s", i,
+--- a/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
++++ b/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
+@@ -499,24 +499,17 @@ static int
+ mtk_flow_offload_stats(struct mtk_eth *eth, struct flow_cls_offload *f)
+ {
+ 	struct mtk_flow_entry *entry;
+-	struct mtk_foe_accounting diff;
+-	u32 idle;
++	int idle;
+ 
+ 	entry = rhashtable_lookup(&eth->flow_table, &f->cookie,
+ 				  mtk_flow_ht_params);
+ 	if (!entry)
+ 		return -ENOENT;
+ 
+-	idle = mtk_foe_entry_idle_time(eth->ppe[entry->ppe_index], entry);
++	mtk_foe_entry_get_stats(eth->ppe[entry->ppe_index], entry, &idle,
++				&f->stats.pkts, &f->stats.bytes);
+ 	f->stats.lastused = jiffies - idle * HZ;
+ 
+-	if (entry->hash != 0xFFFF &&
+-	    mtk_foe_entry_get_mib(eth->ppe[entry->ppe_index], entry->hash,
+-				  &diff)) {
+-		f->stats.pkts += diff.packets;
+-		f->stats.bytes += diff.bytes;
+-	}
+-
+ 	return 0;
+ }
+ 
diff --git a/target/linux/generic/pending-5.15/736-05-net-ethernet-mtk_eth_soc-add-missing-ppe-cache-flush.patch b/target/linux/generic/pending-5.15/736-05-net-ethernet-mtk_eth_soc-add-missing-ppe-cache-flush.patch
new file mode 100644
index 0000000000..0b876acacf
--- /dev/null
+++ b/target/linux/generic/pending-5.15/736-05-net-ethernet-mtk_eth_soc-add-missing-ppe-cache-flush.patch
@@ -0,0 +1,21 @@
+From: Felix Fietkau <nbd@nbd.name>
+Date: Thu, 23 Mar 2023 11:19:14 +0100
+Subject: [PATCH] net: ethernet: mtk_eth_soc: add missing ppe cache flush when
+ deleting a flow
+
+The cache needs to be flushed to ensure that the hardware stops offloading
+the flow immediately.
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- a/drivers/net/ethernet/mediatek/mtk_ppe.c
++++ b/drivers/net/ethernet/mediatek/mtk_ppe.c
+@@ -525,6 +525,7 @@ __mtk_foe_entry_clear(struct mtk_ppe *pp
+ 		hwe->ib1 &= ~MTK_FOE_IB1_STATE;
+ 		hwe->ib1 |= FIELD_PREP(MTK_FOE_IB1_STATE, MTK_FOE_STATE_INVALID);
+ 		dma_wmb();
++		mtk_ppe_cache_clear(ppe);
+ 	}
+ 	entry->hash = 0xffff;
+