[PATCH net-next 1/4] net: dsa: motorcomm: Split MIB module
From: David Yang
Date: Thu Sep 03 2026 - 12:32:53 EST
yt922x is going to use a different MIB scheme, split it to reduce the
length of chip.c.
Signed-off-by: David Yang <mmyangfl@xxxxxxxxx>
---
drivers/net/dsa/motorcomm/Makefile | 1 +
drivers/net/dsa/motorcomm/chip.c | 366 +---------------------------
drivers/net/dsa/motorcomm/chip.h | 63 -----
drivers/net/dsa/motorcomm/mib.c | 373 +++++++++++++++++++++++++++++
drivers/net/dsa/motorcomm/mib.h | 98 ++++++++
5 files changed, 474 insertions(+), 427 deletions(-)
create mode 100644 drivers/net/dsa/motorcomm/mib.c
create mode 100644 drivers/net/dsa/motorcomm/mib.h
diff --git a/drivers/net/dsa/motorcomm/Makefile b/drivers/net/dsa/motorcomm/Makefile
index aeb12cb91f93..5c2d34ec05fc 100644
--- a/drivers/net/dsa/motorcomm/Makefile
+++ b/drivers/net/dsa/motorcomm/Makefile
@@ -2,4 +2,5 @@
obj-$(CONFIG_NET_DSA_YT921X) += yt921x.o
yt921x-objs := chip.o
yt921x-$(CONFIG_NET_DSA_YT921X_LEDS) += leds.o
+yt921x-objs += mib.o
yt921x-objs += smi.o
diff --git a/drivers/net/dsa/motorcomm/chip.c b/drivers/net/dsa/motorcomm/chip.c
index d663af010f43..77440bf5fa7a 100644
--- a/drivers/net/dsa/motorcomm/chip.c
+++ b/drivers/net/dsa/motorcomm/chip.c
@@ -27,75 +27,9 @@
#include "chip.h"
#include "leds.h"
+#include "mib.h"
#include "smi.h"
-struct yt921x_mib_desc {
- unsigned int size;
- unsigned int offset;
- const char *name;
-};
-
-#define MIB_DESC(_size, _offset, _name) \
- {_size, _offset, _name}
-
-/* Must agree with yt921x_mib
- *
- * Unstructured fields (name != NULL) will appear in get_ethtool_stats(),
- * structured go to their *_stats() methods, but we need their sizes and offsets
- * to perform 32bit MIB overflow wraparound.
- */
-static const struct yt921x_mib_desc yt921x_mib_descs[] = {
- MIB_DESC(1, YT921X_MIB_DATA_RX_BROADCAST, NULL),
- MIB_DESC(1, YT921X_MIB_DATA_RX_PAUSE, NULL),
- MIB_DESC(1, YT921X_MIB_DATA_RX_MULTICAST, NULL),
- MIB_DESC(1, YT921X_MIB_DATA_RX_CRC_ERR, NULL),
-
- MIB_DESC(1, YT921X_MIB_DATA_RX_ALIGN_ERR, NULL),
- MIB_DESC(1, YT921X_MIB_DATA_RX_UNDERSIZE_ERR, NULL),
- MIB_DESC(1, YT921X_MIB_DATA_RX_FRAG_ERR, NULL),
- MIB_DESC(1, YT921X_MIB_DATA_RX_PKT_SZ_64, NULL),
-
- MIB_DESC(1, YT921X_MIB_DATA_RX_PKT_SZ_65_TO_127, NULL),
- MIB_DESC(1, YT921X_MIB_DATA_RX_PKT_SZ_128_TO_255, NULL),
- MIB_DESC(1, YT921X_MIB_DATA_RX_PKT_SZ_256_TO_511, NULL),
- MIB_DESC(1, YT921X_MIB_DATA_RX_PKT_SZ_512_TO_1023, NULL),
-
- MIB_DESC(1, YT921X_MIB_DATA_RX_PKT_SZ_1024_TO_1518, NULL),
- MIB_DESC(1, YT921X_MIB_DATA_RX_PKT_SZ_1519_TO_MAX, NULL),
- MIB_DESC(2, YT921X_MIB_DATA_RX_GOOD_BYTES, NULL),
-
- MIB_DESC(2, YT921X_MIB_DATA_RX_BAD_BYTES, "RxBadBytes"),
- MIB_DESC(1, YT921X_MIB_DATA_RX_OVERSIZE_ERR, NULL),
-
- MIB_DESC(1, YT921X_MIB_DATA_RX_DROPPED, NULL),
- MIB_DESC(1, YT921X_MIB_DATA_TX_BROADCAST, NULL),
- MIB_DESC(1, YT921X_MIB_DATA_TX_PAUSE, NULL),
- MIB_DESC(1, YT921X_MIB_DATA_TX_MULTICAST, NULL),
-
- MIB_DESC(1, YT921X_MIB_DATA_TX_UNDERSIZE_ERR, NULL),
- MIB_DESC(1, YT921X_MIB_DATA_TX_PKT_SZ_64, NULL),
- MIB_DESC(1, YT921X_MIB_DATA_TX_PKT_SZ_65_TO_127, NULL),
- MIB_DESC(1, YT921X_MIB_DATA_TX_PKT_SZ_128_TO_255, NULL),
-
- MIB_DESC(1, YT921X_MIB_DATA_TX_PKT_SZ_256_TO_511, NULL),
- MIB_DESC(1, YT921X_MIB_DATA_TX_PKT_SZ_512_TO_1023, NULL),
- MIB_DESC(1, YT921X_MIB_DATA_TX_PKT_SZ_1024_TO_1518, NULL),
- MIB_DESC(1, YT921X_MIB_DATA_TX_PKT_SZ_1519_TO_MAX, NULL),
-
- MIB_DESC(2, YT921X_MIB_DATA_TX_GOOD_BYTES, NULL),
- MIB_DESC(1, YT921X_MIB_DATA_TX_COLLISION, NULL),
-
- MIB_DESC(1, YT921X_MIB_DATA_TX_EXCESSIVE_COLLISION, NULL),
- MIB_DESC(1, YT921X_MIB_DATA_TX_MULTIPLE_COLLISION, NULL),
- MIB_DESC(1, YT921X_MIB_DATA_TX_SINGLE_COLLISION, NULL),
- MIB_DESC(1, YT921X_MIB_DATA_TX_PKT, NULL),
-
- MIB_DESC(1, YT921X_MIB_DATA_TX_DEFERRED, NULL),
- MIB_DESC(1, YT921X_MIB_DATA_TX_LATE_COLLISION, NULL),
- MIB_DESC(1, YT921X_MIB_DATA_RX_OAM, "RxOAM"),
- MIB_DESC(1, YT921X_MIB_DATA_TX_OAM, "TxOAM"),
-};
-
struct yt921x_info {
const char *name;
u16 major;
@@ -154,14 +88,6 @@ static const struct yt921x_info yt921x_infos[] = {
#define YT921X_VID_UNWARE 4095
-/* The interval should be small enough to avoid overflow of 32bit MIBs.
- *
- * Until we can read MIBs from stats64 call directly (i.e. sleep
- * there), we have to poll stats more frequently then it is actually needed.
- * For overflow protection, normally, 100 sec interval should have been OK.
- */
-#define YT921X_STATS_INTERVAL_JIFFIES (3 * HZ)
-
struct yt921x_reg_mdio {
struct mii_bus *bus;
int addr;
@@ -544,294 +470,6 @@ yt921x_mbus_ext_init(struct yt921x_priv *priv, struct device_node *mnp)
return 0;
}
-/* Read and handle overflow of 32bit MIBs. MIB buffer must be zeroed before. */
-static int yt921x_read_mib(struct yt921x_priv *priv, int port)
-{
- struct yt921x_port *pp = &priv->ports[port];
- struct device *dev = to_device(priv);
- struct yt921x_mib *mib = &pp->mib;
- int res = 0;
-
- /* Reading of yt921x_port::mib is not protected by a lock and it's vain
- * to keep its consistency, since we have to read registers one by one
- * and there is no way to make a snapshot of MIB stats.
- *
- * Writing (by this function only) is and should be protected by
- * reg_lock.
- */
-
- for (size_t i = 0; i < ARRAY_SIZE(yt921x_mib_descs); i++) {
- const struct yt921x_mib_desc *desc = &yt921x_mib_descs[i];
- u32 reg = YT921X_MIBn_DATA0(port) + desc->offset;
- u64 *valp = &((u64 *)mib)[i];
- u32 val0;
- u64 val;
-
- res = yt921x_reg_read(priv, reg, &val0);
- if (res)
- break;
-
- if (desc->size <= 1) {
- u64 old_val = *valp;
-
- val = (old_val & ~(u64)U32_MAX) | val0;
- if (val < old_val)
- val += 1ull << 32;
- } else {
- u32 val1;
-
- res = yt921x_reg_read(priv, reg + 4, &val1);
- if (res)
- break;
- val = ((u64)val1 << 32) | val0;
- }
-
- WRITE_ONCE(*valp, val);
- }
-
- pp->rx_frames = mib->rx_64byte + mib->rx_65_127byte +
- mib->rx_128_255byte + mib->rx_256_511byte +
- mib->rx_512_1023byte + mib->rx_1024_1518byte +
- mib->rx_jumbo;
- pp->tx_frames = mib->tx_64byte + mib->tx_65_127byte +
- mib->tx_128_255byte + mib->tx_256_511byte +
- mib->tx_512_1023byte + mib->tx_1024_1518byte +
- mib->tx_jumbo;
-
- if (res)
- dev_err(dev, "Failed to %s port %d: %i\n", "read stats for",
- port, res);
- return res;
-}
-
-static void yt921x_poll_mib(struct work_struct *work)
-{
- struct yt921x_port *pp = container_of_const(work, struct yt921x_port,
- mib_read.work);
- struct yt921x_priv *priv = (void *)(pp - pp->index) -
- offsetof(struct yt921x_priv, ports);
- unsigned long delay = YT921X_STATS_INTERVAL_JIFFIES;
- int port = pp->index;
- int res;
-
- mutex_lock(&priv->reg_lock);
- res = yt921x_read_mib(priv, port);
- mutex_unlock(&priv->reg_lock);
- if (res)
- delay *= 4;
-
- schedule_delayed_work(&pp->mib_read, delay);
-}
-
-static void
-yt921x_dsa_get_strings(struct dsa_switch *ds, int port, u32 stringset,
- uint8_t *data)
-{
- if (stringset != ETH_SS_STATS)
- return;
-
- for (size_t i = 0; i < ARRAY_SIZE(yt921x_mib_descs); i++) {
- const struct yt921x_mib_desc *desc = &yt921x_mib_descs[i];
-
- if (desc->name)
- ethtool_puts(&data, desc->name);
- }
-}
-
-static void
-yt921x_dsa_get_ethtool_stats(struct dsa_switch *ds, int port, uint64_t *data)
-{
- struct yt921x_priv *priv = to_yt921x_priv(ds);
- struct yt921x_port *pp = &priv->ports[port];
- struct yt921x_mib *mib = &pp->mib;
- size_t j;
-
- mutex_lock(&priv->reg_lock);
- yt921x_read_mib(priv, port);
- mutex_unlock(&priv->reg_lock);
-
- j = 0;
- for (size_t i = 0; i < ARRAY_SIZE(yt921x_mib_descs); i++) {
- const struct yt921x_mib_desc *desc = &yt921x_mib_descs[i];
-
- if (!desc->name)
- continue;
-
- data[j] = ((u64 *)mib)[i];
- j++;
- }
-}
-
-static int yt921x_dsa_get_sset_count(struct dsa_switch *ds, int port, int sset)
-{
- int cnt = 0;
-
- if (sset != ETH_SS_STATS)
- return 0;
-
- for (size_t i = 0; i < ARRAY_SIZE(yt921x_mib_descs); i++) {
- const struct yt921x_mib_desc *desc = &yt921x_mib_descs[i];
-
- if (desc->name)
- cnt++;
- }
-
- return cnt;
-}
-
-static void
-yt921x_dsa_get_eth_mac_stats(struct dsa_switch *ds, int port,
- struct ethtool_eth_mac_stats *mac_stats)
-{
- struct yt921x_priv *priv = to_yt921x_priv(ds);
- struct yt921x_port *pp = &priv->ports[port];
- struct yt921x_mib *mib = &pp->mib;
-
- mutex_lock(&priv->reg_lock);
- yt921x_read_mib(priv, port);
- mutex_unlock(&priv->reg_lock);
-
- mac_stats->FramesTransmittedOK = pp->tx_frames;
- mac_stats->SingleCollisionFrames = mib->tx_single_collisions;
- mac_stats->MultipleCollisionFrames = mib->tx_multiple_collisions;
- mac_stats->FramesReceivedOK = pp->rx_frames;
- mac_stats->FrameCheckSequenceErrors = mib->rx_crc_errors;
- mac_stats->AlignmentErrors = mib->rx_alignment_errors;
- mac_stats->OctetsTransmittedOK = mib->tx_good_bytes;
- mac_stats->FramesWithDeferredXmissions = mib->tx_deferred;
- mac_stats->LateCollisions = mib->tx_late_collisions;
- mac_stats->FramesAbortedDueToXSColls = mib->tx_aborted_errors;
- /* mac_stats->FramesLostDueToIntMACXmitError */
- /* mac_stats->CarrierSenseErrors */
- mac_stats->OctetsReceivedOK = mib->rx_good_bytes;
- /* mac_stats->FramesLostDueToIntMACRcvError */
- mac_stats->MulticastFramesXmittedOK = mib->tx_multicast;
- mac_stats->BroadcastFramesXmittedOK = mib->tx_broadcast;
- /* mac_stats->FramesWithExcessiveDeferral */
- mac_stats->MulticastFramesReceivedOK = mib->rx_multicast;
- mac_stats->BroadcastFramesReceivedOK = mib->rx_broadcast;
- /* mac_stats->InRangeLengthErrors */
- /* mac_stats->OutOfRangeLengthField */
- mac_stats->FrameTooLongErrors = mib->rx_oversize_errors;
-}
-
-static void
-yt921x_dsa_get_eth_ctrl_stats(struct dsa_switch *ds, int port,
- struct ethtool_eth_ctrl_stats *ctrl_stats)
-{
- struct yt921x_priv *priv = to_yt921x_priv(ds);
- struct yt921x_port *pp = &priv->ports[port];
- struct yt921x_mib *mib = &pp->mib;
-
- mutex_lock(&priv->reg_lock);
- yt921x_read_mib(priv, port);
- mutex_unlock(&priv->reg_lock);
-
- ctrl_stats->MACControlFramesTransmitted = mib->tx_pause;
- ctrl_stats->MACControlFramesReceived = mib->rx_pause;
- /* ctrl_stats->UnsupportedOpcodesReceived */
-}
-
-static const struct ethtool_rmon_hist_range yt921x_rmon_ranges[] = {
- { 0, 64 },
- { 65, 127 },
- { 128, 255 },
- { 256, 511 },
- { 512, 1023 },
- { 1024, 1518 },
- { 1519, YT921X_FRAME_SIZE_MAX },
- {}
-};
-
-static void
-yt921x_dsa_get_rmon_stats(struct dsa_switch *ds, int port,
- struct ethtool_rmon_stats *rmon_stats,
- const struct ethtool_rmon_hist_range **ranges)
-{
- struct yt921x_priv *priv = to_yt921x_priv(ds);
- struct yt921x_port *pp = &priv->ports[port];
- struct yt921x_mib *mib = &pp->mib;
-
- mutex_lock(&priv->reg_lock);
- yt921x_read_mib(priv, port);
- mutex_unlock(&priv->reg_lock);
-
- *ranges = yt921x_rmon_ranges;
-
- rmon_stats->undersize_pkts = mib->rx_undersize_errors;
- rmon_stats->oversize_pkts = mib->rx_oversize_errors;
- rmon_stats->fragments = mib->rx_alignment_errors;
- /* rmon_stats->jabbers */
-
- rmon_stats->hist[0] = mib->rx_64byte;
- rmon_stats->hist[1] = mib->rx_65_127byte;
- rmon_stats->hist[2] = mib->rx_128_255byte;
- rmon_stats->hist[3] = mib->rx_256_511byte;
- rmon_stats->hist[4] = mib->rx_512_1023byte;
- rmon_stats->hist[5] = mib->rx_1024_1518byte;
- rmon_stats->hist[6] = mib->rx_jumbo;
-
- rmon_stats->hist_tx[0] = mib->tx_64byte;
- rmon_stats->hist_tx[1] = mib->tx_65_127byte;
- rmon_stats->hist_tx[2] = mib->tx_128_255byte;
- rmon_stats->hist_tx[3] = mib->tx_256_511byte;
- rmon_stats->hist_tx[4] = mib->tx_512_1023byte;
- rmon_stats->hist_tx[5] = mib->tx_1024_1518byte;
- rmon_stats->hist_tx[6] = mib->tx_jumbo;
-}
-
-static void
-yt921x_dsa_get_stats64(struct dsa_switch *ds, int port,
- struct rtnl_link_stats64 *stats)
-{
- struct yt921x_priv *priv = to_yt921x_priv(ds);
- struct yt921x_port *pp = &priv->ports[port];
- struct yt921x_mib *mib = &pp->mib;
-
- stats->rx_length_errors = mib->rx_undersize_errors +
- mib->rx_fragment_errors;
- stats->rx_over_errors = mib->rx_oversize_errors;
- stats->rx_crc_errors = mib->rx_crc_errors;
- stats->rx_frame_errors = mib->rx_alignment_errors;
- /* stats->rx_fifo_errors */
- /* stats->rx_missed_errors */
-
- stats->tx_aborted_errors = mib->tx_aborted_errors;
- /* stats->tx_carrier_errors */
- stats->tx_fifo_errors = mib->tx_undersize_errors;
- /* stats->tx_heartbeat_errors */
- stats->tx_window_errors = mib->tx_late_collisions;
-
- stats->rx_packets = pp->rx_frames;
- stats->tx_packets = pp->tx_frames;
- stats->rx_bytes = mib->rx_good_bytes - ETH_FCS_LEN * stats->rx_packets;
- stats->tx_bytes = mib->tx_good_bytes - ETH_FCS_LEN * stats->tx_packets;
- stats->rx_errors = stats->rx_length_errors + stats->rx_over_errors +
- stats->rx_crc_errors + stats->rx_frame_errors;
- stats->tx_errors = stats->tx_aborted_errors + stats->tx_fifo_errors +
- stats->tx_window_errors;
- stats->rx_dropped = mib->rx_dropped;
- /* stats->tx_dropped */
- stats->multicast = mib->rx_multicast;
- stats->collisions = mib->tx_collisions;
-}
-
-static void
-yt921x_dsa_get_pause_stats(struct dsa_switch *ds, int port,
- struct ethtool_pause_stats *pause_stats)
-{
- struct yt921x_priv *priv = to_yt921x_priv(ds);
- struct yt921x_port *pp = &priv->ports[port];
- struct yt921x_mib *mib = &pp->mib;
-
- mutex_lock(&priv->reg_lock);
- yt921x_read_mib(priv, port);
- mutex_unlock(&priv->reg_lock);
-
- pause_stats->tx_pause_frames = mib->tx_pause;
- pause_stats->rx_pause_frames = mib->rx_pause;
-}
-
static int
yt921x_set_eee(struct yt921x_priv *priv, int port, struct ethtool_keee *e)
{
@@ -4749,7 +4387,7 @@ static int yt921x_mdio_probe(struct mdio_device *mdiodev)
struct yt921x_port *pp = &priv->ports[i];
pp->index = i;
- INIT_DELAYED_WORK(&pp->mib_read, yt921x_poll_mib);
+ INIT_DELAYED_WORK(&pp->mib_read, yt921x_mib_poll);
}
ds = &priv->ds;
diff --git a/drivers/net/dsa/motorcomm/chip.h b/drivers/net/dsa/motorcomm/chip.h
index 83cd454955dd..84c7065b1cd4 100644
--- a/drivers/net/dsa/motorcomm/chip.h
+++ b/drivers/net/dsa/motorcomm/chip.h
@@ -167,69 +167,6 @@
#define YT921X_EEE_CTRL 0xb0000
#define YT921X_EEE_CTRL_ENn(port) BIT(port)
-#define YT921X_MIB_CTRL 0xc0004
-#define YT921X_MIB_CTRL_CLEAN BIT(30)
-#define YT921X_MIB_CTRL_PORT_M GENMASK(6, 3)
-#define YT921X_MIB_CTRL_PORT(x) FIELD_PREP(YT921X_MIB_CTRL_PORT_M, (x))
-#define YT921X_MIB_CTRL_ONE_PORT BIT(1)
-#define YT921X_MIB_CTRL_ALL_PORT BIT(0)
-#define YT921X_MIBn_DATA0(port) (0xc0100 + 0x100 * (port))
-#define YT921X_MIBn_DATAm(port, x) (YT921X_MIBn_DATA0(port) + 4 * (x))
-#define YT921X_MIB_DATA_RX_BROADCAST 0x00
-#define YT921X_MIB_DATA_RX_PAUSE 0x04
-#define YT921X_MIB_DATA_RX_MULTICAST 0x08
-#define YT921X_MIB_DATA_RX_CRC_ERR 0x0c
-
-#define YT921X_MIB_DATA_RX_ALIGN_ERR 0x10
-#define YT921X_MIB_DATA_RX_UNDERSIZE_ERR 0x14
-#define YT921X_MIB_DATA_RX_FRAG_ERR 0x18
-#define YT921X_MIB_DATA_RX_PKT_SZ_64 0x1c
-
-#define YT921X_MIB_DATA_RX_PKT_SZ_65_TO_127 0x20
-#define YT921X_MIB_DATA_RX_PKT_SZ_128_TO_255 0x24
-#define YT921X_MIB_DATA_RX_PKT_SZ_256_TO_511 0x28
-#define YT921X_MIB_DATA_RX_PKT_SZ_512_TO_1023 0x2c
-
-#define YT921X_MIB_DATA_RX_PKT_SZ_1024_TO_1518 0x30
-#define YT921X_MIB_DATA_RX_PKT_SZ_1519_TO_MAX 0x34
-/* 0x38: unused */
-#define YT921X_MIB_DATA_RX_GOOD_BYTES 0x3c
-
-/* 0x40: 64 bytes */
-#define YT921X_MIB_DATA_RX_BAD_BYTES 0x44
-/* 0x48: 64 bytes */
-#define YT921X_MIB_DATA_RX_OVERSIZE_ERR 0x4c
-
-#define YT921X_MIB_DATA_RX_DROPPED 0x50
-#define YT921X_MIB_DATA_TX_BROADCAST 0x54
-#define YT921X_MIB_DATA_TX_PAUSE 0x58
-#define YT921X_MIB_DATA_TX_MULTICAST 0x5c
-
-#define YT921X_MIB_DATA_TX_UNDERSIZE_ERR 0x60
-#define YT921X_MIB_DATA_TX_PKT_SZ_64 0x64
-#define YT921X_MIB_DATA_TX_PKT_SZ_65_TO_127 0x68
-#define YT921X_MIB_DATA_TX_PKT_SZ_128_TO_255 0x6c
-
-#define YT921X_MIB_DATA_TX_PKT_SZ_256_TO_511 0x70
-#define YT921X_MIB_DATA_TX_PKT_SZ_512_TO_1023 0x74
-#define YT921X_MIB_DATA_TX_PKT_SZ_1024_TO_1518 0x78
-#define YT921X_MIB_DATA_TX_PKT_SZ_1519_TO_MAX 0x7c
-
-/* 0x80: unused */
-#define YT921X_MIB_DATA_TX_GOOD_BYTES 0x84
-/* 0x88: 64 bytes */
-#define YT921X_MIB_DATA_TX_COLLISION 0x8c
-
-#define YT921X_MIB_DATA_TX_EXCESSIVE_COLLISION 0x90
-#define YT921X_MIB_DATA_TX_MULTIPLE_COLLISION 0x94
-#define YT921X_MIB_DATA_TX_SINGLE_COLLISION 0x98
-#define YT921X_MIB_DATA_TX_PKT 0x9c
-
-#define YT921X_MIB_DATA_TX_DEFERRED 0xa0
-#define YT921X_MIB_DATA_TX_LATE_COLLISION 0xa4
-#define YT921X_MIB_DATA_RX_OAM 0xa8
-#define YT921X_MIB_DATA_TX_OAM 0xac
-
#define YT921X_EDATA_CTRL 0xe0000
#define YT921X_EDATA_CTRL_ADDR_M GENMASK(15, 8)
#define YT921X_EDATA_CTRL_ADDR(x) FIELD_PREP(YT921X_EDATA_CTRL_ADDR_M, (x))
diff --git a/drivers/net/dsa/motorcomm/mib.c b/drivers/net/dsa/motorcomm/mib.c
new file mode 100644
index 000000000000..74728b1ed777
--- /dev/null
+++ b/drivers/net/dsa/motorcomm/mib.c
@@ -0,0 +1,373 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2026 David Yang
+ */
+
+#include "chip.h"
+#include "mib.h"
+#include "smi.h"
+
+struct yt921x_mib_desc {
+ unsigned char size;
+ unsigned char offset;
+ const char *name;
+};
+
+#define MIB_DESC(_size, _offset, _name) {_size, _offset, _name}
+
+/* Must agree with yt921x_mib
+ *
+ * Unstructured fields (name != NULL) will appear in get_ethtool_stats(),
+ * structured go to their *_stats() methods, but we need their sizes and offsets
+ * to perform 32bit MIB overflow wraparound.
+ */
+static const struct yt921x_mib_desc yt921x_mib_descs[] = {
+ MIB_DESC(1, YT921X_MIB_DATA_RX_BROADCAST, NULL),
+ MIB_DESC(1, YT921X_MIB_DATA_RX_PAUSE, NULL),
+ MIB_DESC(1, YT921X_MIB_DATA_RX_MULTICAST, NULL),
+ MIB_DESC(1, YT921X_MIB_DATA_RX_CRC_ERR, NULL),
+
+ MIB_DESC(1, YT921X_MIB_DATA_RX_ALIGN_ERR, NULL),
+ MIB_DESC(1, YT921X_MIB_DATA_RX_UNDERSIZE_ERR, NULL),
+ MIB_DESC(1, YT921X_MIB_DATA_RX_FRAG_ERR, NULL),
+ MIB_DESC(1, YT921X_MIB_DATA_RX_PKT_SZ_64, NULL),
+
+ MIB_DESC(1, YT921X_MIB_DATA_RX_PKT_SZ_65_TO_127, NULL),
+ MIB_DESC(1, YT921X_MIB_DATA_RX_PKT_SZ_128_TO_255, NULL),
+ MIB_DESC(1, YT921X_MIB_DATA_RX_PKT_SZ_256_TO_511, NULL),
+ MIB_DESC(1, YT921X_MIB_DATA_RX_PKT_SZ_512_TO_1023, NULL),
+
+ MIB_DESC(1, YT921X_MIB_DATA_RX_PKT_SZ_1024_TO_1518, NULL),
+ MIB_DESC(1, YT921X_MIB_DATA_RX_PKT_SZ_1519_TO_MAX, NULL),
+ MIB_DESC(2, YT921X_MIB_DATA_RX_GOOD_BYTES, NULL),
+
+ MIB_DESC(2, YT921X_MIB_DATA_RX_BAD_BYTES, "RxBadBytes"),
+ MIB_DESC(1, YT921X_MIB_DATA_RX_OVERSIZE_ERR, NULL),
+
+ MIB_DESC(1, YT921X_MIB_DATA_RX_DROPPED, NULL),
+ MIB_DESC(1, YT921X_MIB_DATA_TX_BROADCAST, NULL),
+ MIB_DESC(1, YT921X_MIB_DATA_TX_PAUSE, NULL),
+ MIB_DESC(1, YT921X_MIB_DATA_TX_MULTICAST, NULL),
+
+ MIB_DESC(1, YT921X_MIB_DATA_TX_UNDERSIZE_ERR, NULL),
+ MIB_DESC(1, YT921X_MIB_DATA_TX_PKT_SZ_64, NULL),
+ MIB_DESC(1, YT921X_MIB_DATA_TX_PKT_SZ_65_TO_127, NULL),
+ MIB_DESC(1, YT921X_MIB_DATA_TX_PKT_SZ_128_TO_255, NULL),
+
+ MIB_DESC(1, YT921X_MIB_DATA_TX_PKT_SZ_256_TO_511, NULL),
+ MIB_DESC(1, YT921X_MIB_DATA_TX_PKT_SZ_512_TO_1023, NULL),
+ MIB_DESC(1, YT921X_MIB_DATA_TX_PKT_SZ_1024_TO_1518, NULL),
+ MIB_DESC(1, YT921X_MIB_DATA_TX_PKT_SZ_1519_TO_MAX, NULL),
+
+ MIB_DESC(2, YT921X_MIB_DATA_TX_GOOD_BYTES, NULL),
+ MIB_DESC(1, YT921X_MIB_DATA_TX_COLLISION, NULL),
+
+ MIB_DESC(1, YT921X_MIB_DATA_TX_EXCESSIVE_COLLISION, NULL),
+ MIB_DESC(1, YT921X_MIB_DATA_TX_MULTIPLE_COLLISION, NULL),
+ MIB_DESC(1, YT921X_MIB_DATA_TX_SINGLE_COLLISION, NULL),
+ MIB_DESC(1, YT921X_MIB_DATA_TX_PKT, NULL),
+
+ MIB_DESC(1, YT921X_MIB_DATA_TX_DEFERRED, NULL),
+ MIB_DESC(1, YT921X_MIB_DATA_TX_LATE_COLLISION, NULL),
+ MIB_DESC(1, YT921X_MIB_DATA_RX_OAM, "RxOAM"),
+ MIB_DESC(1, YT921X_MIB_DATA_TX_OAM, "TxOAM"),
+};
+
+/* The interval should be small enough to avoid overflow of 32bit MIBs.
+ *
+ * Until we can read MIBs from stats64 call directly (i.e. sleep
+ * there), we have to poll stats more frequently then it is actually needed.
+ * For overflow protection, normally, 100 sec interval should have been OK.
+ */
+#define YT921X_STATS_INTERVAL_JIFFIES (3 * HZ)
+
+#define to_yt921x_priv(_ds) container_of_const(_ds, struct yt921x_priv, ds)
+#define to_device(priv) ((priv)->ds.dev)
+
+/* Read and handle overflow of 32bit MIBs. MIB buffer must be zeroed before. */
+static int yt921x_mib_read(struct yt921x_priv *priv, int port)
+{
+ struct yt921x_port *pp = &priv->ports[port];
+ struct device *dev = to_device(priv);
+ struct yt921x_mib *mib = &pp->mib;
+ int res = 0;
+
+ /* Reading of yt921x_port::mib is not protected by a lock and it's vain
+ * to keep its consistency, since we have to read registers one by one
+ * and there is no way to make a snapshot of MIB stats.
+ *
+ * Writing (by this function only) is and should be protected by
+ * reg_lock.
+ */
+
+ for (size_t i = 0; i < ARRAY_SIZE(yt921x_mib_descs); i++) {
+ const struct yt921x_mib_desc *desc = &yt921x_mib_descs[i];
+ u32 reg = YT921X_MIBn_DATA0(port) + desc->offset;
+ u64 *valp = &((u64 *)mib)[i];
+ u32 val0;
+ u64 val;
+
+ res = yt921x_reg_read(priv, reg, &val0);
+ if (res)
+ break;
+
+ if (desc->size <= 1) {
+ u64 old_val = *valp;
+
+ val = (old_val & ~(u64)U32_MAX) | val0;
+ if (val < old_val)
+ val += 1ull << 32;
+ } else {
+ u32 val1;
+
+ res = yt921x_reg_read(priv, reg + 4, &val1);
+ if (res)
+ break;
+ val = ((u64)val1 << 32) | val0;
+ }
+
+ WRITE_ONCE(*valp, val);
+ }
+
+ pp->rx_frames = mib->rx_64byte + mib->rx_65_127byte +
+ mib->rx_128_255byte + mib->rx_256_511byte +
+ mib->rx_512_1023byte + mib->rx_1024_1518byte +
+ mib->rx_jumbo;
+ pp->tx_frames = mib->tx_64byte + mib->tx_65_127byte +
+ mib->tx_128_255byte + mib->tx_256_511byte +
+ mib->tx_512_1023byte + mib->tx_1024_1518byte +
+ mib->tx_jumbo;
+
+ if (res)
+ dev_err(dev, "Failed to %s port %d: %i\n", "read stats for",
+ port, res);
+ return res;
+}
+
+void yt921x_mib_poll(struct work_struct *work)
+{
+ struct yt921x_port *pp = container_of_const(work, struct yt921x_port,
+ mib_read.work);
+ struct yt921x_priv *priv = (void *)(pp - pp->index) -
+ offsetof(struct yt921x_priv, ports);
+ unsigned long delay = YT921X_STATS_INTERVAL_JIFFIES;
+ int port = pp->index;
+ int res;
+
+ mutex_lock(&priv->reg_lock);
+ res = yt921x_mib_read(priv, port);
+ mutex_unlock(&priv->reg_lock);
+ if (res)
+ delay *= 4;
+
+ schedule_delayed_work(&pp->mib_read, delay);
+}
+
+void
+yt921x_dsa_get_strings(struct dsa_switch *ds, int port, u32 stringset,
+ uint8_t *data)
+{
+ if (stringset != ETH_SS_STATS)
+ return;
+
+ for (size_t i = 0; i < ARRAY_SIZE(yt921x_mib_descs); i++) {
+ const struct yt921x_mib_desc *desc = &yt921x_mib_descs[i];
+
+ if (desc->name)
+ ethtool_puts(&data, desc->name);
+ }
+}
+
+void
+yt921x_dsa_get_ethtool_stats(struct dsa_switch *ds, int port, uint64_t *data)
+{
+ struct yt921x_priv *priv = to_yt921x_priv(ds);
+ struct yt921x_port *pp = &priv->ports[port];
+ struct yt921x_mib *mib = &pp->mib;
+ size_t j;
+
+ mutex_lock(&priv->reg_lock);
+ yt921x_mib_read(priv, port);
+ mutex_unlock(&priv->reg_lock);
+
+ j = 0;
+ for (size_t i = 0; i < ARRAY_SIZE(yt921x_mib_descs); i++) {
+ const struct yt921x_mib_desc *desc = &yt921x_mib_descs[i];
+
+ if (!desc->name)
+ continue;
+
+ data[j] = ((u64 *)mib)[i];
+ j++;
+ }
+}
+
+int yt921x_dsa_get_sset_count(struct dsa_switch *ds, int port, int sset)
+{
+ int cnt = 0;
+
+ if (sset != ETH_SS_STATS)
+ return 0;
+
+ for (size_t i = 0; i < ARRAY_SIZE(yt921x_mib_descs); i++) {
+ const struct yt921x_mib_desc *desc = &yt921x_mib_descs[i];
+
+ if (desc->name)
+ cnt++;
+ }
+
+ return cnt;
+}
+
+void
+yt921x_dsa_get_eth_mac_stats(struct dsa_switch *ds, int port,
+ struct ethtool_eth_mac_stats *mac_stats)
+{
+ struct yt921x_priv *priv = to_yt921x_priv(ds);
+ struct yt921x_port *pp = &priv->ports[port];
+ struct yt921x_mib *mib = &pp->mib;
+
+ mutex_lock(&priv->reg_lock);
+ yt921x_mib_read(priv, port);
+ mutex_unlock(&priv->reg_lock);
+
+ mac_stats->FramesTransmittedOK = pp->tx_frames;
+ mac_stats->SingleCollisionFrames = mib->tx_single_collisions;
+ mac_stats->MultipleCollisionFrames = mib->tx_multiple_collisions;
+ mac_stats->FramesReceivedOK = pp->rx_frames;
+ mac_stats->FrameCheckSequenceErrors = mib->rx_crc_errors;
+ mac_stats->AlignmentErrors = mib->rx_alignment_errors;
+ mac_stats->OctetsTransmittedOK = mib->tx_good_bytes;
+ mac_stats->FramesWithDeferredXmissions = mib->tx_deferred;
+ mac_stats->LateCollisions = mib->tx_late_collisions;
+ mac_stats->FramesAbortedDueToXSColls = mib->tx_aborted_errors;
+ /* mac_stats->FramesLostDueToIntMACXmitError */
+ /* mac_stats->CarrierSenseErrors */
+ mac_stats->OctetsReceivedOK = mib->rx_good_bytes;
+ /* mac_stats->FramesLostDueToIntMACRcvError */
+ mac_stats->MulticastFramesXmittedOK = mib->tx_multicast;
+ mac_stats->BroadcastFramesXmittedOK = mib->tx_broadcast;
+ /* mac_stats->FramesWithExcessiveDeferral */
+ mac_stats->MulticastFramesReceivedOK = mib->rx_multicast;
+ mac_stats->BroadcastFramesReceivedOK = mib->rx_broadcast;
+ /* mac_stats->InRangeLengthErrors */
+ /* mac_stats->OutOfRangeLengthField */
+ mac_stats->FrameTooLongErrors = mib->rx_oversize_errors;
+}
+
+void
+yt921x_dsa_get_eth_ctrl_stats(struct dsa_switch *ds, int port,
+ struct ethtool_eth_ctrl_stats *ctrl_stats)
+{
+ struct yt921x_priv *priv = to_yt921x_priv(ds);
+ struct yt921x_port *pp = &priv->ports[port];
+ struct yt921x_mib *mib = &pp->mib;
+
+ mutex_lock(&priv->reg_lock);
+ yt921x_mib_read(priv, port);
+ mutex_unlock(&priv->reg_lock);
+
+ ctrl_stats->MACControlFramesTransmitted = mib->tx_pause;
+ ctrl_stats->MACControlFramesReceived = mib->rx_pause;
+ /* ctrl_stats->UnsupportedOpcodesReceived */
+}
+
+static const struct ethtool_rmon_hist_range yt921x_rmon_ranges[] = {
+ { 0, 64 },
+ { 65, 127 },
+ { 128, 255 },
+ { 256, 511 },
+ { 512, 1023 },
+ { 1024, 1518 },
+ { 1519, YT921X_FRAME_SIZE_MAX },
+ {}
+};
+
+void
+yt921x_dsa_get_rmon_stats(struct dsa_switch *ds, int port,
+ struct ethtool_rmon_stats *rmon_stats,
+ const struct ethtool_rmon_hist_range **ranges)
+{
+ struct yt921x_priv *priv = to_yt921x_priv(ds);
+ struct yt921x_port *pp = &priv->ports[port];
+ struct yt921x_mib *mib = &pp->mib;
+
+ mutex_lock(&priv->reg_lock);
+ yt921x_mib_read(priv, port);
+ mutex_unlock(&priv->reg_lock);
+
+ *ranges = yt921x_rmon_ranges;
+
+ rmon_stats->undersize_pkts = mib->rx_undersize_errors;
+ rmon_stats->oversize_pkts = mib->rx_oversize_errors;
+ rmon_stats->fragments = mib->rx_alignment_errors;
+ /* rmon_stats->jabbers */
+
+ rmon_stats->hist[0] = mib->rx_64byte;
+ rmon_stats->hist[1] = mib->rx_65_127byte;
+ rmon_stats->hist[2] = mib->rx_128_255byte;
+ rmon_stats->hist[3] = mib->rx_256_511byte;
+ rmon_stats->hist[4] = mib->rx_512_1023byte;
+ rmon_stats->hist[5] = mib->rx_1024_1518byte;
+ rmon_stats->hist[6] = mib->rx_jumbo;
+
+ rmon_stats->hist_tx[0] = mib->tx_64byte;
+ rmon_stats->hist_tx[1] = mib->tx_65_127byte;
+ rmon_stats->hist_tx[2] = mib->tx_128_255byte;
+ rmon_stats->hist_tx[3] = mib->tx_256_511byte;
+ rmon_stats->hist_tx[4] = mib->tx_512_1023byte;
+ rmon_stats->hist_tx[5] = mib->tx_1024_1518byte;
+ rmon_stats->hist_tx[6] = mib->tx_jumbo;
+}
+
+void
+yt921x_dsa_get_stats64(struct dsa_switch *ds, int port,
+ struct rtnl_link_stats64 *stats)
+{
+ struct yt921x_priv *priv = to_yt921x_priv(ds);
+ struct yt921x_port *pp = &priv->ports[port];
+ struct yt921x_mib *mib = &pp->mib;
+
+ stats->rx_length_errors = mib->rx_undersize_errors +
+ mib->rx_fragment_errors;
+ stats->rx_over_errors = mib->rx_oversize_errors;
+ stats->rx_crc_errors = mib->rx_crc_errors;
+ stats->rx_frame_errors = mib->rx_alignment_errors;
+ /* stats->rx_fifo_errors */
+ /* stats->rx_missed_errors */
+
+ stats->tx_aborted_errors = mib->tx_aborted_errors;
+ /* stats->tx_carrier_errors */
+ stats->tx_fifo_errors = mib->tx_undersize_errors;
+ /* stats->tx_heartbeat_errors */
+ stats->tx_window_errors = mib->tx_late_collisions;
+
+ stats->rx_packets = pp->rx_frames;
+ stats->tx_packets = pp->tx_frames;
+ stats->rx_bytes = mib->rx_good_bytes - ETH_FCS_LEN * stats->rx_packets;
+ stats->tx_bytes = mib->tx_good_bytes - ETH_FCS_LEN * stats->tx_packets;
+ stats->rx_errors = stats->rx_length_errors + stats->rx_over_errors +
+ stats->rx_crc_errors + stats->rx_frame_errors;
+ stats->tx_errors = stats->tx_aborted_errors + stats->tx_fifo_errors +
+ stats->tx_window_errors;
+ stats->rx_dropped = mib->rx_dropped;
+ /* stats->tx_dropped */
+ stats->multicast = mib->rx_multicast;
+ stats->collisions = mib->tx_collisions;
+}
+
+void
+yt921x_dsa_get_pause_stats(struct dsa_switch *ds, int port,
+ struct ethtool_pause_stats *pause_stats)
+{
+ struct yt921x_priv *priv = to_yt921x_priv(ds);
+ struct yt921x_port *pp = &priv->ports[port];
+ struct yt921x_mib *mib = &pp->mib;
+
+ mutex_lock(&priv->reg_lock);
+ yt921x_mib_read(priv, port);
+ mutex_unlock(&priv->reg_lock);
+
+ pause_stats->tx_pause_frames = mib->tx_pause;
+ pause_stats->rx_pause_frames = mib->rx_pause;
+}
diff --git a/drivers/net/dsa/motorcomm/mib.h b/drivers/net/dsa/motorcomm/mib.h
new file mode 100644
index 000000000000..c6728366df6e
--- /dev/null
+++ b/drivers/net/dsa/motorcomm/mib.h
@@ -0,0 +1,98 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (c) 2026 David Yang
+ */
+
+#ifndef _YT_MIB_H
+#define _YT_MIB_H
+
+#include <net/dsa.h>
+
+#define YT921X_MIB_CTRL 0xc0004
+#define YT921X_MIB_CTRL_CLEAN BIT(30)
+#define YT921X_MIB_CTRL_PORT_M GENMASK(6, 3)
+#define YT921X_MIB_CTRL_PORT(x) FIELD_PREP(YT921X_MIB_CTRL_PORT_M, (x))
+#define YT921X_MIB_CTRL_ONE_PORT BIT(1)
+#define YT921X_MIB_CTRL_ALL_PORT BIT(0)
+#define YT921X_MIBn_DATA0(port) (0xc0100 + 0x100 * (port))
+#define YT921X_MIBn_DATAm(port, x) (YT921X_MIBn_DATA0(port) + 4 * (x))
+#define YT921X_MIB_DATA_RX_BROADCAST 0x00
+#define YT921X_MIB_DATA_RX_PAUSE 0x04
+#define YT921X_MIB_DATA_RX_MULTICAST 0x08
+#define YT921X_MIB_DATA_RX_CRC_ERR 0x0c
+
+#define YT921X_MIB_DATA_RX_ALIGN_ERR 0x10
+#define YT921X_MIB_DATA_RX_UNDERSIZE_ERR 0x14
+#define YT921X_MIB_DATA_RX_FRAG_ERR 0x18
+#define YT921X_MIB_DATA_RX_PKT_SZ_64 0x1c
+
+#define YT921X_MIB_DATA_RX_PKT_SZ_65_TO_127 0x20
+#define YT921X_MIB_DATA_RX_PKT_SZ_128_TO_255 0x24
+#define YT921X_MIB_DATA_RX_PKT_SZ_256_TO_511 0x28
+#define YT921X_MIB_DATA_RX_PKT_SZ_512_TO_1023 0x2c
+
+#define YT921X_MIB_DATA_RX_PKT_SZ_1024_TO_1518 0x30
+#define YT921X_MIB_DATA_RX_PKT_SZ_1519_TO_MAX 0x34
+/* 0x38: unused */
+#define YT921X_MIB_DATA_RX_GOOD_BYTES 0x3c
+
+/* 0x40: 64 bytes */
+#define YT921X_MIB_DATA_RX_BAD_BYTES 0x44
+/* 0x48: 64 bytes */
+#define YT921X_MIB_DATA_RX_OVERSIZE_ERR 0x4c
+
+#define YT921X_MIB_DATA_RX_DROPPED 0x50
+#define YT921X_MIB_DATA_TX_BROADCAST 0x54
+#define YT921X_MIB_DATA_TX_PAUSE 0x58
+#define YT921X_MIB_DATA_TX_MULTICAST 0x5c
+
+#define YT921X_MIB_DATA_TX_UNDERSIZE_ERR 0x60
+#define YT921X_MIB_DATA_TX_PKT_SZ_64 0x64
+#define YT921X_MIB_DATA_TX_PKT_SZ_65_TO_127 0x68
+#define YT921X_MIB_DATA_TX_PKT_SZ_128_TO_255 0x6c
+
+#define YT921X_MIB_DATA_TX_PKT_SZ_256_TO_511 0x70
+#define YT921X_MIB_DATA_TX_PKT_SZ_512_TO_1023 0x74
+#define YT921X_MIB_DATA_TX_PKT_SZ_1024_TO_1518 0x78
+#define YT921X_MIB_DATA_TX_PKT_SZ_1519_TO_MAX 0x7c
+
+/* 0x80: unused */
+#define YT921X_MIB_DATA_TX_GOOD_BYTES 0x84
+/* 0x88: 64 bytes */
+#define YT921X_MIB_DATA_TX_COLLISION 0x8c
+
+#define YT921X_MIB_DATA_TX_EXCESSIVE_COLLISION 0x90
+#define YT921X_MIB_DATA_TX_MULTIPLE_COLLISION 0x94
+#define YT921X_MIB_DATA_TX_SINGLE_COLLISION 0x98
+#define YT921X_MIB_DATA_TX_PKT 0x9c
+
+#define YT921X_MIB_DATA_TX_DEFERRED 0xa0
+#define YT921X_MIB_DATA_TX_LATE_COLLISION 0xa4
+#define YT921X_MIB_DATA_RX_OAM 0xa8
+#define YT921X_MIB_DATA_TX_OAM 0xac
+
+void yt921x_mib_poll(struct work_struct *work);
+void
+yt921x_dsa_get_strings(struct dsa_switch *ds, int port, u32 stringset,
+ uint8_t *data);
+void
+yt921x_dsa_get_ethtool_stats(struct dsa_switch *ds, int port, uint64_t *data);
+int yt921x_dsa_get_sset_count(struct dsa_switch *ds, int port, int sset);
+void
+yt921x_dsa_get_eth_mac_stats(struct dsa_switch *ds, int port,
+ struct ethtool_eth_mac_stats *mac_stats);
+void
+yt921x_dsa_get_eth_ctrl_stats(struct dsa_switch *ds, int port,
+ struct ethtool_eth_ctrl_stats *ctrl_stats);
+void
+yt921x_dsa_get_rmon_stats(struct dsa_switch *ds, int port,
+ struct ethtool_rmon_stats *rmon_stats,
+ const struct ethtool_rmon_hist_range **ranges);
+void
+yt921x_dsa_get_stats64(struct dsa_switch *ds, int port,
+ struct rtnl_link_stats64 *stats);
+void
+yt921x_dsa_get_pause_stats(struct dsa_switch *ds, int port,
+ struct ethtool_pause_stats *pause_stats);
+
+#endif
--
2.53.0