Messages in this thread Patch in this message | | | From | Ansuel Smith <> | Subject | [RFC PATCH net-next v3 06/20] net: dsa: qca8k: handle error with qca8k_write operation | Date | Wed, 5 May 2021 00:29:00 +0200 |
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qca8k_write can fail. Rework any user to handle error values and correctly return.
Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com> --- drivers/net/dsa/qca8k.c | 112 +++++++++++++++++++++++++++------------- 1 file changed, 75 insertions(+), 37 deletions(-)
diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c index cde68ed6856b..899bf93118eb 100644 --- a/drivers/net/dsa/qca8k.c +++ b/drivers/net/dsa/qca8k.c @@ -165,15 +165,16 @@ qca8k_read(struct qca8k_priv *priv, u32 reg) return val; } -static void +static int qca8k_write(struct qca8k_priv *priv, u32 reg, u32 val) { + struct mii_bus *bus = priv->bus; u16 r1, r2, page; int ret; qca8k_split_addr(reg, &r1, &r2, &page); - mutex_lock_nested(&priv->bus->mdio_lock, MDIO_MUTEX_NESTED); + mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED); ret = qca8k_set_page(priv->bus, page); if (ret < 0) @@ -183,6 +184,7 @@ qca8k_write(struct qca8k_priv *priv, u32 reg, u32 val) exit: mutex_unlock(&priv->bus->mdio_lock); + return ret; } static u32 @@ -242,9 +244,7 @@ qca8k_regmap_write(void *ctx, uint32_t reg, uint32_t val) { struct qca8k_priv *priv = (struct qca8k_priv *)ctx; - qca8k_write(priv, reg, val); - - return 0; + return qca8k_write(priv, reg, val); } static const struct regmap_range qca8k_readable_ranges[] = { @@ -365,6 +365,7 @@ static int qca8k_fdb_access(struct qca8k_priv *priv, enum qca8k_fdb_cmd cmd, int port) { u32 reg; + int ret; /* Set the command and FDB index */ reg = QCA8K_ATU_FUNC_BUSY; @@ -375,7 +376,9 @@ qca8k_fdb_access(struct qca8k_priv *priv, enum qca8k_fdb_cmd cmd, int port) } /* Write the function register triggering the table access */ - qca8k_write(priv, QCA8K_REG_ATU_FUNC, reg); + ret = qca8k_write(priv, QCA8K_REG_ATU_FUNC, reg); + if (ret) + return ret; /* wait for completion */ if (qca8k_busy_wait(priv, QCA8K_REG_ATU_FUNC, QCA8K_ATU_FUNC_BUSY)) @@ -448,6 +451,7 @@ static int qca8k_vlan_access(struct qca8k_priv *priv, enum qca8k_vlan_cmd cmd, u16 vid) { u32 reg; + int ret; /* Set the command and VLAN index */ reg = QCA8K_VTU_FUNC1_BUSY; @@ -455,7 +459,9 @@ qca8k_vlan_access(struct qca8k_priv *priv, enum qca8k_vlan_cmd cmd, u16 vid) reg |= vid << QCA8K_VTU_FUNC1_VID_S; /* Write the function register triggering the table access */ - qca8k_write(priv, QCA8K_REG_VTU_FUNC1, reg); + ret = qca8k_write(priv, QCA8K_REG_VTU_FUNC1, reg); + if (ret) + return ret; /* wait for completion */ if (qca8k_busy_wait(priv, QCA8K_REG_VTU_FUNC1, QCA8K_VTU_FUNC1_BUSY)) @@ -503,7 +509,9 @@ qca8k_vlan_add(struct qca8k_priv *priv, u8 port, u16 vid, bool untagged) reg |= QCA8K_VTU_FUNC0_EG_MODE_TAG << QCA8K_VTU_FUNC0_EG_MODE_S(port); - qca8k_write(priv, QCA8K_REG_VTU_FUNC0, reg); + ret = qca8k_write(priv, QCA8K_REG_VTU_FUNC0, reg); + if (ret) + return ret; ret = qca8k_vlan_access(priv, QCA8K_VLAN_LOAD, vid); out: @@ -546,7 +554,9 @@ qca8k_vlan_del(struct qca8k_priv *priv, u8 port, u16 vid) if (del) { ret = qca8k_vlan_access(priv, QCA8K_VLAN_PURGE, vid); } else { - qca8k_write(priv, QCA8K_REG_VTU_FUNC0, reg); + ret = qca8k_write(priv, QCA8K_REG_VTU_FUNC0, reg); + if (ret) + return ret; ret = qca8k_vlan_access(priv, QCA8K_VLAN_LOAD, vid); } @@ -556,15 +566,25 @@ qca8k_vlan_del(struct qca8k_priv *priv, u8 port, u16 vid) return ret; } -static void +static int qca8k_mib_init(struct qca8k_priv *priv) { + int ret; + mutex_lock(&priv->reg_mutex); qca8k_reg_set(priv, QCA8K_REG_MIB, QCA8K_MIB_FLUSH | QCA8K_MIB_BUSY); - qca8k_busy_wait(priv, QCA8K_REG_MIB, QCA8K_MIB_BUSY); + + ret = qca8k_busy_wait(priv, QCA8K_REG_MIB, QCA8K_MIB_BUSY); + if (ret) + goto exit; + qca8k_reg_set(priv, QCA8K_REG_MIB, QCA8K_MIB_CPU_KEEP); - qca8k_write(priv, QCA8K_REG_MODULE_EN, QCA8K_MODULE_EN_MIB); + + ret = qca8k_write(priv, QCA8K_REG_MODULE_EN, QCA8K_MODULE_EN_MIB); + +exit: mutex_unlock(&priv->reg_mutex); + return ret; } static void @@ -601,6 +621,7 @@ static int qca8k_mdio_write(struct qca8k_priv *priv, int port, u32 regnum, u16 data) { u32 phy, val; + int ret; if (regnum >= QCA8K_MDIO_MASTER_MAX_REG) return -EINVAL; @@ -614,7 +635,9 @@ qca8k_mdio_write(struct qca8k_priv *priv, int port, u32 regnum, u16 data) QCA8K_MDIO_MASTER_REG_ADDR(regnum) | QCA8K_MDIO_MASTER_DATA(data); - qca8k_write(priv, QCA8K_MDIO_MASTER_CTRL, val); + ret = qca8k_write(priv, QCA8K_MDIO_MASTER_CTRL, val); + if (ret) + return ret; return qca8k_busy_wait(priv, QCA8K_MDIO_MASTER_CTRL, QCA8K_MDIO_MASTER_BUSY); @@ -624,6 +647,7 @@ static int qca8k_mdio_read(struct qca8k_priv *priv, int port, u32 regnum) { u32 phy, val; + int ret; if (regnum >= QCA8K_MDIO_MASTER_MAX_REG) return -EINVAL; @@ -636,7 +660,9 @@ qca8k_mdio_read(struct qca8k_priv *priv, int port, u32 regnum) QCA8K_MDIO_MASTER_READ | QCA8K_MDIO_MASTER_PHY_ADDR(phy) | QCA8K_MDIO_MASTER_REG_ADDR(regnum); - qca8k_write(priv, QCA8K_MDIO_MASTER_CTRL, val); + ret = qca8k_write(priv, QCA8K_MDIO_MASTER_CTRL, val); + if (ret) + return ret; if (qca8k_busy_wait(priv, QCA8K_MDIO_MASTER_CTRL, QCA8K_MDIO_MASTER_BUSY)) @@ -767,12 +793,18 @@ qca8k_setup(struct dsa_switch *ds) QCA8K_GLOBAL_FW_CTRL0_CPU_PORT_EN); /* Enable MIB counters */ - qca8k_mib_init(priv); + ret = qca8k_mib_init(priv); + if (ret) + pr_warn("mib init failed"); /* Enable QCA header mode on the cpu port */ - qca8k_write(priv, QCA8K_REG_PORT_HDR_CTRL(QCA8K_CPU_PORT), - QCA8K_PORT_HDR_CTRL_ALL << QCA8K_PORT_HDR_CTRL_TX_S | - QCA8K_PORT_HDR_CTRL_ALL << QCA8K_PORT_HDR_CTRL_RX_S); + ret = qca8k_write(priv, QCA8K_REG_PORT_HDR_CTRL(QCA8K_CPU_PORT), + QCA8K_PORT_HDR_CTRL_ALL << QCA8K_PORT_HDR_CTRL_TX_S | + QCA8K_PORT_HDR_CTRL_ALL << QCA8K_PORT_HDR_CTRL_RX_S); + if (ret) { + pr_err("failed enabling QCA header mode"); + return ret; + } /* Disable forwarding by default on all ports */ for (i = 0; i < QCA8K_NUM_PORTS; i++) @@ -784,11 +816,13 @@ qca8k_setup(struct dsa_switch *ds) qca8k_port_set_status(priv, i, 0); /* Forward all unknown frames to CPU port for Linux processing */ - qca8k_write(priv, QCA8K_REG_GLOBAL_FW_CTRL1, - BIT(0) << QCA8K_GLOBAL_FW_CTRL1_IGMP_DP_S | - BIT(0) << QCA8K_GLOBAL_FW_CTRL1_BC_DP_S | - BIT(0) << QCA8K_GLOBAL_FW_CTRL1_MC_DP_S | - BIT(0) << QCA8K_GLOBAL_FW_CTRL1_UC_DP_S); + ret = qca8k_write(priv, QCA8K_REG_GLOBAL_FW_CTRL1, + BIT(0) << QCA8K_GLOBAL_FW_CTRL1_IGMP_DP_S | + BIT(0) << QCA8K_GLOBAL_FW_CTRL1_BC_DP_S | + BIT(0) << QCA8K_GLOBAL_FW_CTRL1_MC_DP_S | + BIT(0) << QCA8K_GLOBAL_FW_CTRL1_UC_DP_S); + if (ret) + return ret; /* Setup connection between CPU port & user ports */ for (i = 0; i < QCA8K_NUM_PORTS; i++) { @@ -816,16 +850,20 @@ qca8k_setup(struct dsa_switch *ds) qca8k_rmw(priv, QCA8K_EGRESS_VLAN(i), 0xfff << shift, QCA8K_PORT_VID_DEF << shift); - qca8k_write(priv, QCA8K_REG_PORT_VLAN_CTRL0(i), - QCA8K_PORT_VLAN_CVID(QCA8K_PORT_VID_DEF) | - QCA8K_PORT_VLAN_SVID(QCA8K_PORT_VID_DEF)); + ret = qca8k_write(priv, QCA8K_REG_PORT_VLAN_CTRL0(i), + QCA8K_PORT_VLAN_CVID(QCA8K_PORT_VID_DEF) | + QCA8K_PORT_VLAN_SVID(QCA8K_PORT_VID_DEF)); + if (ret) + return ret; } } /* Setup our port MTUs to match power on defaults */ for (i = 0; i < QCA8K_NUM_PORTS; i++) priv->port_mtu[i] = ETH_FRAME_LEN + ETH_FCS_LEN; - qca8k_write(priv, QCA8K_MAX_FRAME_SIZE, ETH_FRAME_LEN + ETH_FCS_LEN); + ret = qca8k_write(priv, QCA8K_MAX_FRAME_SIZE, ETH_FRAME_LEN + ETH_FCS_LEN); + if (ret) + pr_warn("failed setting MTU settings"); /* Flush the FDB table */ qca8k_fdb_flush(priv); @@ -1141,8 +1179,8 @@ qca8k_set_mac_eee(struct dsa_switch *ds, int port, struct ethtool_eee *eee) { struct qca8k_priv *priv = (struct qca8k_priv *)ds->priv; u32 lpi_en = QCA8K_REG_EEE_CTRL_LPI_EN(port); - int ret = 0; u32 reg; + int ret; mutex_lock(&priv->reg_mutex); reg = qca8k_read(priv, QCA8K_REG_EEE_CTRL); @@ -1155,7 +1193,7 @@ qca8k_set_mac_eee(struct dsa_switch *ds, int port, struct ethtool_eee *eee) reg |= lpi_en; else reg &= ~lpi_en; - qca8k_write(priv, QCA8K_REG_EEE_CTRL, reg); + ret = qca8k_write(priv, QCA8K_REG_EEE_CTRL, reg); exit: mutex_unlock(&priv->reg_mutex); @@ -1285,9 +1323,7 @@ qca8k_port_change_mtu(struct dsa_switch *ds, int port, int new_mtu) mtu = priv->port_mtu[i]; /* Include L2 header / FCS length */ - qca8k_write(priv, QCA8K_MAX_FRAME_SIZE, mtu + ETH_HLEN + ETH_FCS_LEN); - - return 0; + return qca8k_write(priv, QCA8K_MAX_FRAME_SIZE, mtu + ETH_HLEN + ETH_FCS_LEN); } static int @@ -1382,7 +1418,7 @@ qca8k_port_vlan_add(struct dsa_switch *ds, int port, bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED; bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID; struct qca8k_priv *priv = ds->priv; - int ret = 0; + int ret; ret = qca8k_vlan_add(priv, port, vlan->vid, untagged); if (ret) { @@ -1395,9 +1431,11 @@ qca8k_port_vlan_add(struct dsa_switch *ds, int port, qca8k_rmw(priv, QCA8K_EGRESS_VLAN(port), 0xfff << shift, vlan->vid << shift); - qca8k_write(priv, QCA8K_REG_PORT_VLAN_CTRL0(port), - QCA8K_PORT_VLAN_CVID(vlan->vid) | - QCA8K_PORT_VLAN_SVID(vlan->vid)); + ret = qca8k_write(priv, QCA8K_REG_PORT_VLAN_CTRL0(port), + QCA8K_PORT_VLAN_CVID(vlan->vid) | + QCA8K_PORT_VLAN_SVID(vlan->vid)); + if (ret) + return ret; } return 0; @@ -1408,7 +1446,7 @@ qca8k_port_vlan_del(struct dsa_switch *ds, int port, const struct switchdev_obj_port_vlan *vlan) { struct qca8k_priv *priv = ds->priv; - int ret = 0; + int ret; ret = qca8k_vlan_del(priv, port, vlan->vid); if (ret) -- 2.30.2
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