[PATCH v2] net: ethernet: mediatek: ppe: add support for flow accounting

From: Daniel Golle
Date: Tue Nov 01 2022 - 15:37:56 EST

The PPE units found in MT7622 and newer support packet and byte
accounting of hw-offloaded flows. Add support for reading those
counters as found in MediaTek's SDK[1].

[1]: https://git01.mediatek.com/plugins/gitiles/openwrt/feeds/mtk-openwrt-feeds/+/bc6a6a375c800dc2b80e1a325a2c732d1737df92
Signed-off-by: Daniel Golle <daniel@xxxxxxxxxxxxxx>
---
v2: fix wrong variable name in return value check spotted by Denis Kirjanov

drivers/net/ethernet/mediatek/mtk_eth_soc.c | 11 +-
drivers/net/ethernet/mediatek/mtk_eth_soc.h | 1 +
drivers/net/ethernet/mediatek/mtk_ppe.c | 122 +++++++++++++++++-
drivers/net/ethernet/mediatek/mtk_ppe.h | 23 +++-
.../net/ethernet/mediatek/mtk_ppe_debugfs.c | 9 +-
.../net/ethernet/mediatek/mtk_ppe_offload.c | 7 +
drivers/net/ethernet/mediatek/mtk_ppe_regs.h | 14 ++
7 files changed, 178 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 789268b15106ec..5fcd66fca7a089 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -4140,7 +4140,9 @@ static int mtk_probe(struct platform_device *pdev)
u32 ppe_addr = eth->soc->reg_map->ppe_base + i * 0x400;

eth->ppe[i] = mtk_ppe_init(eth, eth->base + ppe_addr,
- eth->soc->offload_version, i);
+ eth->soc->offload_version, i,
+ eth->soc->has_accounting);
+
if (!eth->ppe[i]) {
err = -ENOMEM;
goto err_free_dev;
@@ -4221,6 +4223,7 @@ static const struct mtk_soc_data mt2701_data = {
.hw_features = MTK_HW_FEATURES,
.required_clks = MT7623_CLKS_BITMAP,
.required_pctl = true,
+ .has_accounting = false,
.txrx = {
.txd_size = sizeof(struct mtk_tx_dma),
.rxd_size = sizeof(struct mtk_rx_dma),
@@ -4239,6 +4242,7 @@ static const struct mtk_soc_data mt7621_data = {
.required_pctl = false,
.offload_version = 2,
.hash_offset = 2,
+ .has_accounting = false,
.foe_entry_size = sizeof(struct mtk_foe_entry) - 16,
.txrx = {
.txd_size = sizeof(struct mtk_tx_dma),
@@ -4259,6 +4263,7 @@ static const struct mtk_soc_data mt7622_data = {
.required_pctl = false,
.offload_version = 2,
.hash_offset = 2,
+ .has_accounting = true,
.foe_entry_size = sizeof(struct mtk_foe_entry) - 16,
.txrx = {
.txd_size = sizeof(struct mtk_tx_dma),
@@ -4278,6 +4283,7 @@ static const struct mtk_soc_data mt7623_data = {
.required_pctl = true,
.offload_version = 2,
.hash_offset = 2,
+ .has_accounting = false,
.foe_entry_size = sizeof(struct mtk_foe_entry) - 16,
.txrx = {
.txd_size = sizeof(struct mtk_tx_dma),
@@ -4296,6 +4302,7 @@ static const struct mtk_soc_data mt7629_data = {
.hw_features = MTK_HW_FEATURES,
.required_clks = MT7629_CLKS_BITMAP,
.required_pctl = false,
+ .has_accounting = true,
.txrx = {
.txd_size = sizeof(struct mtk_tx_dma),
.rxd_size = sizeof(struct mtk_rx_dma),
@@ -4315,6 +4322,7 @@ static const struct mtk_soc_data mt7986_data = {
.required_pctl = false,
.hash_offset = 4,
.foe_entry_size = sizeof(struct mtk_foe_entry),
+ .has_accounting = true,
.txrx = {
.txd_size = sizeof(struct mtk_tx_dma_v2),
.rxd_size = sizeof(struct mtk_rx_dma_v2),
@@ -4331,6 +4339,7 @@ static const struct mtk_soc_data rt5350_data = {
.hw_features = MTK_HW_FEATURES_MT7628,
.required_clks = MT7628_CLKS_BITMAP,
.required_pctl = false,
+ .has_accounting = false,
.txrx = {
.txd_size = sizeof(struct mtk_tx_dma),
.rxd_size = sizeof(struct mtk_rx_dma),
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
index 589f27ddc40163..6c2a0a1826c3c7 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -993,6 +993,7 @@ struct mtk_soc_data {
u8 hash_offset;
u16 foe_entry_size;
netdev_features_t hw_features;
+ bool has_accounting;
struct {
u32 txd_size;
u32 rxd_size;
diff --git a/drivers/net/ethernet/mediatek/mtk_ppe.c b/drivers/net/ethernet/mediatek/mtk_ppe.c
index 2d8ca99f2467ff..84555461eaea48 100644
--- a/drivers/net/ethernet/mediatek/mtk_ppe.c
+++ b/drivers/net/ethernet/mediatek/mtk_ppe.c
@@ -74,6 +74,46 @@ static int mtk_ppe_wait_busy(struct mtk_ppe *ppe)
return ret;
}

+static int mtk_ppe_mib_wait_busy(struct mtk_ppe *ppe)
+{
+ 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);
+
+ if (ret)
+ dev_err(ppe->dev, "MIB table busy");
+
+ return ret;
+}
+
+int mtk_mib_entry_read(struct mtk_ppe *ppe, u16 index, u64 *bytes, u64 *packets)
+{
+ u32 val, cnt_r0, cnt_r1, cnt_r2;
+ u32 byte_cnt_low, byte_cnt_high, pkt_cnt_low, pkt_cnt_high;
+
+ 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);
+
+ if (mtk_ppe_mib_wait_busy(ppe))
+ return -ETIMEDOUT;
+
+ cnt_r0 = readl(ppe->base + MTK_PPE_MIB_SER_R0);
+ cnt_r1 = readl(ppe->base + MTK_PPE_MIB_SER_R1);
+ cnt_r2 = readl(ppe->base + MTK_PPE_MIB_SER_R2);
+
+ byte_cnt_low = FIELD_GET(MTK_PPE_MIB_SER_R0_BYTE_CNT_LOW, cnt_r0);
+ 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;
+}
+
static void mtk_ppe_cache_clear(struct mtk_ppe *ppe)
{
ppe_set(ppe, MTK_PPE_CACHE_CTL, MTK_PPE_CACHE_CTL_CLEAR);
@@ -438,6 +478,13 @@ __mtk_foe_entry_clear(struct mtk_ppe *ppe, struct mtk_flow_entry *entry)
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;

@@ -545,6 +592,16 @@ __mtk_foe_entry_commit(struct mtk_ppe *ppe, struct mtk_foe_entry *entry,
wmb();
hwe->ib1 = entry->ib1;

+ if (ppe->accounting) {
+ int type;
+
+ type = FIELD_GET(MTK_FOE_IB1_PACKET_TYPE, entry->ib1);
+ if (type >= MTK_PPE_PKT_TYPE_IPV4_DSLITE)
+ hwe->ipv6.ib2 |= MTK_FOE_IB2_MIB_CNT;
+ else
+ hwe->ipv4.ib2 |= MTK_FOE_IB2_MIB_CNT;
+ }
+
dma_wmb();

mtk_ppe_cache_clear(ppe);
@@ -654,11 +711,8 @@ void __mtk_ppe_check_skb(struct mtk_ppe *ppe, struct sk_buff *skb, u16 hash)
continue;
}

- if (found || !mtk_flow_entry_match(ppe->eth, entry, hwe)) {
- if (entry->hash != 0xffff)
- entry->hash = 0xffff;
+ if (found || !mtk_flow_entry_match(ppe->eth, entry, hwe))
continue;
- }

entry->hash = hash;
__mtk_foe_entry_commit(ppe, &entry->data, hash);
@@ -710,14 +764,42 @@ int mtk_foe_entry_idle_time(struct mtk_ppe *ppe, struct mtk_flow_entry *entry)
return __mtk_foe_entry_idle_time(ppe, entry->data.ib1);
}

+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 version, int index)
+ int version, int index, bool accounting)
{
const struct mtk_soc_data *soc = eth->soc;
struct device *dev = eth->dev;
struct mtk_ppe *ppe;
u32 foe_flow_size;
void *foe;
+ struct mtk_mib_entry *mib;
+ struct mtk_foe_accounting *acct;

ppe = devm_kzalloc(dev, sizeof(*ppe), GFP_KERNEL);
if (!ppe)
@@ -732,6 +814,7 @@ struct mtk_ppe *mtk_ppe_init(struct mtk_eth *eth, void __iomem *base,
ppe->eth = eth;
ppe->dev = dev;
ppe->version = version;
+ ppe->accounting = accounting;

foe = dmam_alloc_coherent(ppe->dev,
MTK_PPE_ENTRIES * soc->foe_entry_size,
@@ -747,6 +830,25 @@ struct mtk_ppe *mtk_ppe_init(struct mtk_eth *eth, void __iomem *base,
if (!ppe->foe_flow)
return NULL;

+ if (accounting) {
+ mib = dmam_alloc_coherent(ppe->dev, MTK_PPE_ENTRIES * sizeof(*mib),
+ &ppe->mib_phys, GFP_KERNEL);
+ if (!mib)
+ return NULL;
+
+ memset(mib, 0, MTK_PPE_ENTRIES * sizeof(*mib));
+
+ ppe->mib_table = mib;
+
+ acct = devm_kzalloc(dev, MTK_PPE_ENTRIES * sizeof(*acct),
+ GFP_KERNEL);
+
+ if (!acct)
+ return NULL;
+
+ ppe->acct_table = acct;
+ }
+
mtk_ppe_debugfs_init(ppe, index);

return ppe;
@@ -861,6 +963,16 @@ void mtk_ppe_start(struct mtk_ppe *ppe)
ppe_w32(ppe, MTK_PPE_DEFAULT_CPU_PORT1, 0xcb777);
ppe_w32(ppe, MTK_PPE_SBW_CTRL, 0x7f);
}
+
+ if (ppe->accounting && ppe->mib_phys) {
+ ppe_w32(ppe, MTK_PPE_MIB_TB_BASE, ppe->mib_phys);
+ ppe_m32(ppe, MTK_PPE_MIB_CFG, MTK_PPE_MIB_CFG_EN,
+ MTK_PPE_MIB_CFG_EN);
+ ppe_m32(ppe, MTK_PPE_MIB_CFG, MTK_PPE_MIB_CFG_RD_CLR,
+ MTK_PPE_MIB_CFG_RD_CLR);
+ ppe_m32(ppe, MTK_PPE_MIB_CACHE_CTL, MTK_PPE_MIB_CACHE_CTL_EN,
+ MTK_PPE_MIB_CFG_RD_CLR);
+ }
}

int mtk_ppe_stop(struct mtk_ppe *ppe)
diff --git a/drivers/net/ethernet/mediatek/mtk_ppe.h b/drivers/net/ethernet/mediatek/mtk_ppe.h
index 0b7a67a958e4ca..b77509a2b0fa30 100644
--- a/drivers/net/ethernet/mediatek/mtk_ppe.h
+++ b/drivers/net/ethernet/mediatek/mtk_ppe.h
@@ -57,6 +57,7 @@ enum {
#define MTK_FOE_IB2_MULTICAST BIT(8)

#define MTK_FOE_IB2_WDMA_QID2 GENMASK(13, 12)
+#define MTK_FOE_IB2_MIB_CNT BIT(15)
#define MTK_FOE_IB2_WDMA_DEVIDX BIT(16)
#define MTK_FOE_IB2_WDMA_WINFO BIT(17)

@@ -284,16 +285,34 @@ struct mtk_flow_entry {
unsigned long cookie;
};

+struct mtk_mib_entry {
+ u32 byt_cnt_l;
+ u16 byt_cnt_h;
+ u32 pkt_cnt_l;
+ u8 pkt_cnt_h;
+ u8 _rsv0;
+ u32 _rsv1;
+} __packed;
+
+struct mtk_foe_accounting {
+ u64 bytes;
+ u64 packets;
+};
+
struct mtk_ppe {
struct mtk_eth *eth;
struct device *dev;
void __iomem *base;
int version;
char dirname[5];
+ bool accounting;

void *foe_table;
dma_addr_t foe_phys;

+ struct mtk_mib_entry *mib_table;
+ dma_addr_t mib_phys;
+
u16 foe_check_time[MTK_PPE_ENTRIES];
struct hlist_head *foe_flow;

@@ -303,7 +322,7 @@ struct mtk_ppe {
};

struct mtk_ppe *mtk_ppe_init(struct mtk_eth *eth, void __iomem *base,
- int version, int index);
+ int version, int index, bool accounting);
void mtk_ppe_start(struct mtk_ppe *ppe);
int mtk_ppe_stop(struct mtk_ppe *ppe);

@@ -354,5 +373,7 @@ 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);

#endif
diff --git a/drivers/net/ethernet/mediatek/mtk_ppe_debugfs.c b/drivers/net/ethernet/mediatek/mtk_ppe_debugfs.c
index 391b071bcff38d..39775740340b9e 100644
--- a/drivers/net/ethernet/mediatek/mtk_ppe_debugfs.c
+++ b/drivers/net/ethernet/mediatek/mtk_ppe_debugfs.c
@@ -82,6 +82,7 @@ mtk_ppe_debugfs_foe_show(struct seq_file *m, void *private, bool bind)
struct mtk_foe_entry *entry = mtk_foe_get_entry(ppe, i);
struct mtk_foe_mac_info *l2;
struct mtk_flow_addr_info ai = {};
+ struct mtk_foe_accounting *acct;
unsigned char h_source[ETH_ALEN];
unsigned char h_dest[ETH_ALEN];
int type, state;
@@ -95,6 +96,8 @@ mtk_ppe_debugfs_foe_show(struct seq_file *m, void *private, bool bind)
if (bind && state != MTK_FOE_STATE_BIND)
continue;

+ acct = mtk_foe_entry_get_mib(ppe, i, NULL);
+
type = FIELD_GET(MTK_FOE_IB1_PACKET_TYPE, entry->ib1);
seq_printf(m, "%05x %s %7s", i,
mtk_foe_entry_state_str(state),
@@ -153,9 +156,11 @@ mtk_ppe_debugfs_foe_show(struct seq_file *m, void *private, bool bind)
*((__be16 *)&h_dest[4]) = htons(l2->dest_mac_lo);

seq_printf(m, " eth=%pM->%pM etype=%04x"
- " vlan=%d,%d ib1=%08x ib2=%08x\n",
+ " vlan=%d,%d ib1=%08x ib2=%08x"
+ " packets=%lld bytes=%lld\n",
h_source, h_dest, ntohs(l2->etype),
- l2->vlan1, l2->vlan2, entry->ib1, ib2);
+ l2->vlan1, l2->vlan2, entry->ib1, ib2,
+ acct->packets, acct->bytes);
}

return 0;
diff --git a/drivers/net/ethernet/mediatek/mtk_ppe_offload.c b/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
index 28bbd1df3e3059..42b5f279cfa5bb 100644
--- a/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
+++ b/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
@@ -491,6 +491,7 @@ 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;

entry = rhashtable_lookup(&eth->flow_table, &f->cookie,
@@ -501,6 +502,12 @@ mtk_flow_offload_stats(struct mtk_eth *eth, struct flow_cls_offload *f)
idle = mtk_foe_entry_idle_time(eth->ppe[entry->ppe_index], entry);
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/drivers/net/ethernet/mediatek/mtk_ppe_regs.h b/drivers/net/ethernet/mediatek/mtk_ppe_regs.h
index 59596d823d8b8a..be804571b825e7 100644
--- a/drivers/net/ethernet/mediatek/mtk_ppe_regs.h
+++ b/drivers/net/ethernet/mediatek/mtk_ppe_regs.h
@@ -143,6 +143,20 @@ enum {

#define MTK_PPE_MIB_TB_BASE 0x338

+#define MTK_PPE_MIB_SER_CR 0x33C
+#define MTK_PPE_MIB_SER_CR_ST BIT(16)
+#define MTK_PPE_MIB_SER_CR_ADDR GENMASK(13, 0)
+
+#define MTK_PPE_MIB_SER_R0 0x340
+#define MTK_PPE_MIB_SER_R0_BYTE_CNT_LOW GENMASK(31, 0)
+
+#define MTK_PPE_MIB_SER_R1 0x344
+#define MTK_PPE_MIB_SER_R1_PKT_CNT_LOW GENMASK(31, 16)
+#define MTK_PPE_MIB_SER_R1_BYTE_CNT_HIGH GENMASK(15, 0)
+
+#define MTK_PPE_MIB_SER_R2 0x348
+#define MTK_PPE_MIB_SER_R2_PKT_CNT_HIGH GENMASK(23, 0)
+
#define MTK_PPE_MIB_CACHE_CTL 0x350
#define MTK_PPE_MIB_CACHE_CTL_EN BIT(0)
#define MTK_PPE_MIB_CACHE_CTL_FLUSH BIT(2)
--
2.38.1