From 5c957c7ca78cce5e4b96866722b0115bd758d945 Mon Sep 17 00:00:00 2001 From: Ansuel Smith Date: Wed, 2 Feb 2022 01:03:30 +0100 Subject: [PATCH] net: dsa: qca8k: add support for mib autocast in Ethernet packet The switch can autocast MIB counter using Ethernet packet. Add support for this and provide a handler for the tagger. The switch will send packet with MIB counter for each port, the switch will use completion API to wait for the correct packet to be received and will complete the task only when each packet is received. Although the handler will drop all the other packet, we still have to consume each MIB packet to complete the request. This is done to prevent mixed data with concurrent ethtool request. connect_tag_protocol() is used to add the handler to the tag_qca tagger, master_state_change() use the MIB lock to make sure no MIB Ethernet is in progress. Signed-off-by: Ansuel Smith Signed-off-by: David S. Miller --- drivers/net/dsa/qca8k.c | 106 +++++++++++++++++++++++++++++++++++++++- drivers/net/dsa/qca8k.h | 17 ++++++- 2 files changed, 121 insertions(+), 2 deletions(-) diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c index e3a215f04559a..199cf4f761c0b 100644 --- a/drivers/net/dsa/qca8k.c +++ b/drivers/net/dsa/qca8k.c @@ -830,7 +830,10 @@ qca8k_mib_init(struct qca8k_priv *priv) int ret; mutex_lock(&priv->reg_mutex); - ret = regmap_set_bits(priv->regmap, QCA8K_REG_MIB, QCA8K_MIB_FLUSH | QCA8K_MIB_BUSY); + ret = regmap_update_bits(priv->regmap, QCA8K_REG_MIB, + QCA8K_MIB_FUNC | QCA8K_MIB_BUSY, + FIELD_PREP(QCA8K_MIB_FUNC, QCA8K_MIB_FLUSH) | + QCA8K_MIB_BUSY); if (ret) goto exit; @@ -1901,6 +1904,97 @@ qca8k_get_strings(struct dsa_switch *ds, int port, u32 stringset, uint8_t *data) ETH_GSTRING_LEN); } +static void qca8k_mib_autocast_handler(struct dsa_switch *ds, struct sk_buff *skb) +{ + const struct qca8k_match_data *match_data; + struct qca8k_mib_eth_data *mib_eth_data; + struct qca8k_priv *priv = ds->priv; + const struct qca8k_mib_desc *mib; + struct mib_ethhdr *mib_ethhdr; + int i, mib_len, offset = 0; + u64 *data; + u8 port; + + mib_ethhdr = (struct mib_ethhdr *)skb_mac_header(skb); + mib_eth_data = &priv->mib_eth_data; + + /* The switch autocast every port. Ignore other packet and + * parse only the requested one. + */ + port = FIELD_GET(QCA_HDR_RECV_SOURCE_PORT, ntohs(mib_ethhdr->hdr)); + if (port != mib_eth_data->req_port) + goto exit; + + match_data = device_get_match_data(priv->dev); + data = mib_eth_data->data; + + for (i = 0; i < match_data->mib_count; i++) { + mib = &ar8327_mib[i]; + + /* First 3 mib are present in the skb head */ + if (i < 3) { + data[i] = mib_ethhdr->data[i]; + continue; + } + + mib_len = sizeof(uint32_t); + + /* Some mib are 64 bit wide */ + if (mib->size == 2) + mib_len = sizeof(uint64_t); + + /* Copy the mib value from packet to the */ + memcpy(data + i, skb->data + offset, mib_len); + + /* Set the offset for the next mib */ + offset += mib_len; + } + +exit: + /* Complete on receiving all the mib packet */ + if (refcount_dec_and_test(&mib_eth_data->port_parsed)) + complete(&mib_eth_data->rw_done); +} + +static int +qca8k_get_ethtool_stats_eth(struct dsa_switch *ds, int port, u64 *data) +{ + struct dsa_port *dp = dsa_to_port(ds, port); + struct qca8k_mib_eth_data *mib_eth_data; + struct qca8k_priv *priv = ds->priv; + int ret; + + mib_eth_data = &priv->mib_eth_data; + + mutex_lock(&mib_eth_data->mutex); + + reinit_completion(&mib_eth_data->rw_done); + + mib_eth_data->req_port = dp->index; + mib_eth_data->data = data; + refcount_set(&mib_eth_data->port_parsed, QCA8K_NUM_PORTS); + + mutex_lock(&priv->reg_mutex); + + /* Send mib autocast request */ + ret = regmap_update_bits(priv->regmap, QCA8K_REG_MIB, + QCA8K_MIB_FUNC | QCA8K_MIB_BUSY, + FIELD_PREP(QCA8K_MIB_FUNC, QCA8K_MIB_CAST) | + QCA8K_MIB_BUSY); + + mutex_unlock(&priv->reg_mutex); + + if (ret) + goto exit; + + ret = wait_for_completion_timeout(&mib_eth_data->rw_done, QCA8K_ETHERNET_TIMEOUT); + +exit: + mutex_unlock(&mib_eth_data->mutex); + + return ret; +} + static void qca8k_get_ethtool_stats(struct dsa_switch *ds, int port, uint64_t *data) @@ -1912,6 +2006,10 @@ qca8k_get_ethtool_stats(struct dsa_switch *ds, int port, u32 hi = 0; int ret; + if (priv->mgmt_master && + qca8k_get_ethtool_stats_eth(ds, port, data) > 0) + return; + match_data = of_device_get_match_data(priv->dev); for (i = 0; i < match_data->mib_count; i++) { @@ -2593,9 +2691,11 @@ qca8k_master_change(struct dsa_switch *ds, const struct net_device *master, return; mutex_lock(&priv->mgmt_eth_data.mutex); + mutex_lock(&priv->mib_eth_data.mutex); priv->mgmt_master = operational ? (struct net_device *)master : NULL; + mutex_unlock(&priv->mib_eth_data.mutex); mutex_unlock(&priv->mgmt_eth_data.mutex); } @@ -2609,6 +2709,7 @@ static int qca8k_connect_tag_protocol(struct dsa_switch *ds, tagger_data = ds->tagger_data; tagger_data->rw_reg_ack_handler = qca8k_rw_reg_ack_handler; + tagger_data->mib_autocast_handler = qca8k_mib_autocast_handler; break; default: @@ -2737,6 +2838,9 @@ qca8k_sw_probe(struct mdio_device *mdiodev) mutex_init(&priv->mgmt_eth_data.mutex); init_completion(&priv->mgmt_eth_data.rw_done); + mutex_init(&priv->mib_eth_data.mutex); + init_completion(&priv->mib_eth_data.rw_done); + priv->ds->dev = &mdiodev->dev; priv->ds->num_ports = QCA8K_NUM_PORTS; priv->ds->priv = priv; diff --git a/drivers/net/dsa/qca8k.h b/drivers/net/dsa/qca8k.h index 75c28689a6520..2d7d084db0894 100644 --- a/drivers/net/dsa/qca8k.h +++ b/drivers/net/dsa/qca8k.h @@ -67,7 +67,7 @@ #define QCA8K_REG_MODULE_EN 0x030 #define QCA8K_MODULE_EN_MIB BIT(0) #define QCA8K_REG_MIB 0x034 -#define QCA8K_MIB_FLUSH BIT(24) +#define QCA8K_MIB_FUNC GENMASK(26, 24) #define QCA8K_MIB_CPU_KEEP BIT(20) #define QCA8K_MIB_BUSY BIT(17) #define QCA8K_MDIO_MASTER_CTRL 0x3c @@ -317,6 +317,12 @@ enum qca8k_vlan_cmd { QCA8K_VLAN_READ = 6, }; +enum qca8k_mid_cmd { + QCA8K_MIB_FLUSH = 1, + QCA8K_MIB_FLUSH_PORT = 2, + QCA8K_MIB_CAST = 3, +}; + struct ar8xxx_port_status { int enabled; }; @@ -340,6 +346,14 @@ struct qca8k_mgmt_eth_data { u32 data[4]; }; +struct qca8k_mib_eth_data { + struct completion rw_done; + struct mutex mutex; /* Process one command at time */ + refcount_t port_parsed; /* Counter to track parsed port */ + u8 req_port; + u64 *data; /* pointer to ethtool data */ +}; + struct qca8k_ports_config { bool sgmii_rx_clk_falling_edge; bool sgmii_tx_clk_falling_edge; @@ -367,6 +381,7 @@ struct qca8k_priv { unsigned int port_mtu[QCA8K_NUM_PORTS]; struct net_device *mgmt_master; /* Track if mdio/mib Ethernet is available */ struct qca8k_mgmt_eth_data mgmt_eth_data; + struct qca8k_mib_eth_data mib_eth_data; }; struct qca8k_mib_desc { -- 2.39.5