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openwrt/target/linux/generic/pending-5.15/731-net-ethernet-mediatek-ppe-add-support-for-flow-accou.patch
Daniel Golle 83c0942ff7
kernel: fix kernel panic in mtk_ppe 
The patch that adds support for hw flow-offloading counters on newer
MediaTek SoCs tries to prints acct->packets and acct->bytes in debugfs,
without checking that acct isn't null. This causes a kernel panic when
trying to read /sys/kernel/debug/ppe0/entries on older MediaTek SoCs.
Fix this by adding a check for acct.

Fixes: openwrt#11756
Fixes: 9721a42a27 ("kernel: support hw flow-offloading counters on newer MediaTek SoCs")
Reported-by: Stijn Tintel <stijn@linux-ipv6.be>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2023-01-16 22:04:35 +00:00

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From patchwork Wed Nov 2 00:58:01 2022
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
X-Patchwork-Submitter: Daniel Golle <daniel@makrotopia.org>
X-Patchwork-Id: 13027653
X-Patchwork-Delegate: kuba@kernel.org
Return-Path: <netdev-owner@kernel.org>
Date: Wed, 2 Nov 2022 00:58:01 +0000
From: Daniel Golle <daniel@makrotopia.org>
To: Felix Fietkau <nbd@nbd.name>, John Crispin <john@phrozen.org>,
Sean Wang <sean.wang@mediatek.com>,
Mark Lee <Mark-MC.Lee@mediatek.com>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>,
Paolo Abeni <pabeni@redhat.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH v4] net: ethernet: mediatek: ppe: add support for flow
accounting
Message-ID: <Y2HAmYYPd77dz+K5@makrotopia.org>
MIME-Version: 1.0
Content-Disposition: inline
Precedence: bulk
List-ID: <netdev.vger.kernel.org>
X-Mailing-List: netdev@vger.kernel.org
X-Patchwork-Delegate: kuba@kernel.org
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@makrotopia.org>
---
v4: declare function mtk_mib_entry_read as static
v3: don't bother to set 'false' values in any zero-initialized struct
use mtk_foe_entry_ib2
both changes were requested by Felix Fietkau
v2: fix wrong variable name in return value check spotted by Denis Kirjanov
drivers/net/ethernet/mediatek/mtk_eth_soc.c | 7 +-
drivers/net/ethernet/mediatek/mtk_eth_soc.h | 1 +
drivers/net/ethernet/mediatek/mtk_ppe.c | 110 +++++++++++++++++-
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, 166 insertions(+), 5 deletions(-)
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -4090,7 +4090,9 @@ static int mtk_probe(struct platform_dev
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;
@@ -4213,6 +4215,7 @@ static const struct mtk_soc_data mt7622_
.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),
@@ -4250,6 +4253,7 @@ static const struct mtk_soc_data mt7629_
.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),
@@ -4270,6 +4274,7 @@ static const struct mtk_soc_data mt7986_
.offload_version = 2,
.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),
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -983,6 +983,7 @@ 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;
--- 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_
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;
+}
+
+static 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);
@@ -444,6 +484,13 @@ __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;
@@ -551,6 +598,9 @@ __mtk_foe_entry_commit(struct mtk_ppe *p
wmb();
hwe->ib1 = entry->ib1;
+ if (ppe->accounting)
+ *mtk_foe_entry_ib2(eth, hwe) |= MTK_FOE_IB2_MIB_CNT;
+
dma_wmb();
mtk_ppe_cache_clear(ppe);
@@ -716,14 +766,42 @@ int mtk_foe_entry_idle_time(struct mtk_p
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)
@@ -738,6 +816,7 @@ struct mtk_ppe *mtk_ppe_init(struct mtk_
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,
@@ -753,6 +832,25 @@ struct mtk_ppe *mtk_ppe_init(struct mtk_
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;
@@ -867,6 +965,16 @@ 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)
--- 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
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
--- 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
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
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
*((__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 ? acct->packets : 0, acct ? acct->bytes : 0);
}
return 0;
--- 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 *e
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;
}
--- 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)
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