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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , linux-kernel@vger.kernel.org Subject: [PATCH net-next v2 3/4] net: dsa: yt921x: Add port police support Date: Fri, 3 Apr 2026 06:34:31 +0800 Message-ID: <20260402223437.109097-4-mmyangfl@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260402223437.109097-1-mmyangfl@gmail.com> References: <20260402223437.109097-1-mmyangfl@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Enable rate meter ability and support limiting the rate of incoming traffic. Signed-off-by: David Yang --- drivers/net/dsa/yt921x.c | 286 ++++++++++++++++++++++++++++++++++++++- drivers/net/dsa/yt921x.h | 54 ++++++++ 2 files changed, 339 insertions(+), 1 deletion(-) diff --git a/drivers/net/dsa/yt921x.c b/drivers/net/dsa/yt921x.c index e5b3ab94f8a6..54d99e54dda7 100644 --- a/drivers/net/dsa/yt921x.c +++ b/drivers/net/dsa/yt921x.c @@ -262,6 +262,14 @@ yt921x_reg_toggle_bits(struct yt921x_priv *priv, u32 reg, u32 mask, bool set) * wrapper so that we can handle them consistently. */ +static void update_ctrls_unaligned(u32 *ctrls, u64 mask, u64 val) +{ + ctrls[0] &= ~((u32)mask); + ctrls[1] &= ~((u32)(mask >> 32)); + ctrls[0] |= (u32)val; + ctrls[1] |= (u32)(val >> 32); +} + static int yt921x_regs_read(struct yt921x_priv *priv, u32 reg, u32 *vals, unsigned int num_regs) @@ -372,6 +380,12 @@ yt921x_reg64_clear_bits(struct yt921x_priv *priv, u32 reg, const u32 *masks) return yt921x_regs_clear_bits(priv, reg, masks, 2); } +static int +yt921x_reg96_write(struct yt921x_priv *priv, u32 reg, const u32 *vals) +{ + return yt921x_regs_write(priv, reg, vals, 3); +} + static int yt921x_reg_mdio_read(void *context, u32 reg, u32 *valp) { struct yt921x_reg_mdio *mdio = context; @@ -1065,6 +1079,13 @@ yt921x_dsa_set_mac_eee(struct dsa_switch *ds, int port, struct ethtool_keee *e) return res; } +static int yt921x_mtu_fetch(struct yt921x_priv *priv, int port) +{ + struct dsa_port *dp = dsa_to_port(&priv->ds, port); + + return dp->user ? READ_ONCE(dp->user->mtu) : ETH_DATA_LEN; +} + static int yt921x_dsa_port_change_mtu(struct dsa_switch *ds, int port, int new_mtu) { @@ -1096,6 +1117,229 @@ static int yt921x_dsa_port_max_mtu(struct dsa_switch *ds, int port) return YT921X_FRAME_SIZE_MAX - ETH_HLEN - ETH_FCS_LEN - YT921X_TAG_LEN; } +/* v * 2^e */ +static u64 ldexpu64(u64 v, int e) +{ + return e >= 0 ? v << e : v >> -e; +} + +/* slot (ns) * rate (/s) / 10^9 (ns/s) = 2^C * token * 4^unit */ +static u32 rate2token(u64 rate, unsigned int slot_ns, int unit, int C) +{ + int e = 2 * unit + C + YT921X_TOKEN_RATE_C; + + return div_u64(ldexpu64(slot_ns * rate, -e), 1000000000); +} + +static u64 token2rate(u32 token, unsigned int slot_ns, int unit, int C) +{ + int e = 2 * unit + C + YT921X_TOKEN_RATE_C; + + return div_u64(ldexpu64(mul_u32_u32(1000000000, token), e), slot_ns); +} + +/* burst = 2^C * token * 4^unit */ +static u32 burst2token(u64 burst, int unit, int C) +{ + return ldexpu64(burst, -(2 * unit + C)); +} + +static u64 token2burst(u32 token, int unit, int C) +{ + return ldexpu64(token, 2 * unit + C); +} + +struct yt921x_meter { + u32 cir; + u32 cbs; + u32 ebs; + int unit; +}; + +#define YT921X_METER_PKT_MODE BIT(0) +#define YT921X_METER_SINGLE_BUCKET BIT(1) + +static int +yt921x_meter_tfm(struct yt921x_priv *priv, int port, unsigned int slot_ns, + u64 rate, u64 burst, unsigned int flags, + u32 cir_max, u32 cbs_max, int unit_max, + struct yt921x_meter *meterp) +{ + const int C = flags & YT921X_METER_PKT_MODE ? YT921X_TOKEN_PKT_C : + YT921X_TOKEN_BYTE_C; + struct device *dev = to_device(priv); + struct yt921x_meter meter; + bool distorted; + u64 burst_est; + u64 burst_sug; + u64 burst_max; + u64 rate_max; + + meter.unit = unit_max; + rate_max = token2rate(cir_max, slot_ns, meter.unit, C); + burst_max = token2burst(cbs_max, meter.unit, C); + + /* Check for unusual values */ + if (rate > rate_max || burst > burst_max) + return -ERANGE; + + /* Check for matching burst */ + burst_est = div_u64(slot_ns * rate, 1000000000); + burst_sug = burst_est; + if (flags & YT921X_METER_PKT_MODE) + burst_sug++; + else + burst_sug += ETH_HLEN + yt921x_mtu_fetch(priv, port) + + ETH_FCS_LEN; + if (burst_sug > burst) + dev_warn(dev, + "Consider burst at least %llu to match rate %llu\n", + burst_sug, rate); + + /* Select unit */ + for (; meter.unit > 0; meter.unit--) { + if (rate > (rate_max >> 2) || burst > (burst_max >> 2)) + break; + rate_max >>= 2; + burst_max >>= 2; + } + + /* Calculate information rate and bucket size */ + distorted = false; + meter.cir = rate2token(rate, slot_ns, meter.unit, C); + if (!meter.cir) { + distorted = true; + meter.cir = 1; + } else if (WARN_ON(meter.cir > cir_max)) { + meter.cir = cir_max; + } + meter.cbs = burst2token(burst, meter.unit, C); + if (!meter.cbs) { + distorted = true; + meter.cbs = 1; + } else if (WARN_ON(meter.cbs > cbs_max)) { + meter.cbs = cbs_max; + } + if (distorted) + dev_dbg(dev, + "Have to increase rate %llu, burst %llu to %llu, %llu\n", + rate, burst, + token2rate(meter.cir, slot_ns, meter.unit, C), + token2burst(meter.cbs, meter.unit, C)); + + /* Cut EBS */ + meter.ebs = 0; + if (!(flags & YT921X_METER_SINGLE_BUCKET)) { + /* We don't have a chance to adjust rate when MTU is changed */ + if (flags & YT921X_METER_PKT_MODE) + burst_est++; + else + burst_est += YT921X_FRAME_SIZE_MAX; + + if (burst_est < burst) { + u32 pbs = meter.cbs; + + meter.cbs = burst2token(burst_est, meter.unit, C); + if (!meter.cbs) { + meter.cbs = 1; + } else if (meter.cbs > cbs_max) { + WARN_ON(1); + meter.cbs = cbs_max; + } + + if (pbs > meter.cbs) + meter.ebs = pbs - meter.cbs; + } + } + + dev_dbg(dev, + "slot %u ns, rate %llu, burst %llu -> unit %d, cir %u, cbs %u, ebs %u\n", + slot_ns, rate, burst, + meter.unit, meter.cir, meter.cbs, meter.ebs); + + *meterp = meter; + return 0; +} + +static void yt921x_dsa_port_policer_del(struct dsa_switch *ds, int port) +{ + struct yt921x_priv *priv = to_yt921x_priv(ds); + struct device *dev = to_device(priv); + int res; + + mutex_lock(&priv->reg_lock); + res = yt921x_reg_write(priv, YT921X_PORTn_METER(port), 0); + mutex_unlock(&priv->reg_lock); + + if (res) + dev_err(dev, "Failed to %s port %d: %i\n", "delete policer on", + port, res); +} + +static int +yt921x_dsa_port_policer_add(struct dsa_switch *ds, int port, + const struct flow_action_police *policer, + struct netlink_ext_ack *extack) +{ + struct yt921x_priv *priv = to_yt921x_priv(ds); + struct yt921x_meter meter; + bool pkt_mode; + u32 ctrls[3]; + u64 burst; + u64 rate; + u32 ctrl; + int res; + + /* mtu defaults to unlimited but we got 2040 here, don't know why */ + if (policer->peakrate_bytes_ps || policer->avrate || policer->overhead) { + NL_SET_ERR_MSG_MOD(extack, + "peakrate / avrate / overhead not supported"); + return -EOPNOTSUPP; + } + if (policer->exceed.act_id != FLOW_ACTION_DROP || + policer->notexceed.act_id != FLOW_ACTION_ACCEPT) { + NL_SET_ERR_MSG_MOD(extack, + "conform-exceed other than drop/ok not supported"); + return -EOPNOTSUPP; + } + + pkt_mode = !!policer->rate_pkt_ps; + rate = pkt_mode ? policer->rate_pkt_ps : policer->rate_bytes_ps; + burst = pkt_mode ? policer->burst_pkt : policer->burst; + res = yt921x_meter_tfm(priv, port, priv->meter_slot_ns, rate, burst, + pkt_mode ? YT921X_METER_PKT_MODE : 0, + YT921X_METER_RATE_MAX, YT921X_METER_BURST_MAX, + YT921X_METER_UNIT_MAX, &meter); + if (res) { + NL_SET_ERR_MSG_MOD(extack, "Unexpected tremendous rate"); + return res; + } + + mutex_lock(&priv->reg_lock); + ctrl = YT921X_PORT_METER_ID(port) | YT921X_PORT_METER_EN; + res = yt921x_reg_write(priv, YT921X_PORTn_METER(port), ctrl); + if (res) + goto end; + + ctrls[0] = 0; + ctrls[1] = YT921X_METER_CTRLb_CIR(meter.cir); + ctrls[2] = YT921X_METER_CTRLc_UNIT(meter.unit) | + YT921X_METER_CTRLc_DROP_R | + YT921X_METER_CTRLc_TOKEN_OVERFLOW_EN | + YT921X_METER_CTRLc_METER_EN; + update_ctrls_unaligned(&ctrls[0], YT921X_METER_CTRLab_EBS_M, + YT921X_METER_CTRLab_EBS(meter.ebs)); + update_ctrls_unaligned(&ctrls[1], YT921X_METER_CTRLbc_CBS_M, + YT921X_METER_CTRLbc_CBS(meter.cbs)); + res = yt921x_reg96_write(priv, + YT921X_METERn_CTRL(port + YT921X_METER_NUM), + ctrls); +end: + mutex_unlock(&priv->reg_lock); + + return res; +} + static int yt921x_mirror_del(struct yt921x_priv *priv, int port, bool ingress) { @@ -3064,6 +3308,7 @@ static int yt921x_chip_detect(struct yt921x_priv *priv) u32 chipid; u32 major; u32 mode; + u32 val; int res; res = yt921x_reg_read(priv, YT921X_CHIP_ID, &chipid); @@ -3098,12 +3343,27 @@ static int yt921x_chip_detect(struct yt921x_priv *priv) return -ENODEV; } + res = yt921x_reg_read(priv, YT921X_SYS_CLK, &val); + if (res) + return res; + switch (FIELD_GET(YT921X_SYS_CLK_SEL_M, val)) { + case 0: + priv->cycle_ns = info->major == YT9215_MAJOR ? 8 : 6; + break; + case YT921X_SYS_CLK_143M: + priv->cycle_ns = 7; + break; + default: + priv->cycle_ns = 8; + } + /* Print chipid here since we are interested in lower 16 bits */ dev_info(dev, "Motorcomm %s ethernet switch, chipid: 0x%x, chipmode: 0x%x 0x%x\n", info->name, chipid, mode, extmode); priv->info = info; + return 0; } @@ -3225,6 +3485,23 @@ static int yt921x_chip_setup_dsa(struct yt921x_priv *priv) return 0; } +static int yt921x_chip_setup_tc(struct yt921x_priv *priv) +{ + unsigned int op_ns; + u32 ctrl; + int res; + + op_ns = 8 * priv->cycle_ns; + + ctrl = max(priv->meter_slot_ns / op_ns, YT921X_METER_SLOT_MIN); + res = yt921x_reg_write(priv, YT921X_METER_SLOT, ctrl); + if (res) + return res; + priv->meter_slot_ns = ctrl * op_ns; + + return 0; +} + static int __maybe_unused yt921x_chip_setup_qos(struct yt921x_priv *priv) { u32 ctrl; @@ -3271,7 +3548,7 @@ static int yt921x_chip_setup(struct yt921x_priv *priv) u32 ctrl; int res; - ctrl = YT921X_FUNC_MIB; + ctrl = YT921X_FUNC_MIB | YT921X_FUNC_METER; res = yt921x_reg_set_bits(priv, YT921X_FUNC, ctrl); if (res) return res; @@ -3280,6 +3557,10 @@ static int yt921x_chip_setup(struct yt921x_priv *priv) if (res) return res; + res = yt921x_chip_setup_tc(priv); + if (res) + return res; + #if IS_ENABLED(CONFIG_DCB) res = yt921x_chip_setup_qos(priv); if (res) @@ -3371,6 +3652,9 @@ static const struct dsa_switch_ops yt921x_dsa_switch_ops = { /* mtu */ .port_change_mtu = yt921x_dsa_port_change_mtu, .port_max_mtu = yt921x_dsa_port_max_mtu, + /* rate */ + .port_policer_del = yt921x_dsa_port_policer_del, + .port_policer_add = yt921x_dsa_port_policer_add, /* hsr */ .port_hsr_leave = dsa_port_simple_hsr_leave, .port_hsr_join = dsa_port_simple_hsr_join, diff --git a/drivers/net/dsa/yt921x.h b/drivers/net/dsa/yt921x.h index 4989d87c2492..e7022657c994 100644 --- a/drivers/net/dsa/yt921x.h +++ b/drivers/net/dsa/yt921x.h @@ -23,6 +23,7 @@ #define YT921X_RST_HW BIT(31) #define YT921X_RST_SW BIT(1) #define YT921X_FUNC 0x80004 +#define YT921X_FUNC_METER BIT(4) #define YT921X_FUNC_MIB BIT(1) #define YT921X_CHIP_ID 0x80008 #define YT921X_CHIP_ID_MAJOR GENMASK(31, 16) @@ -239,6 +240,11 @@ #define YT921X_EDATA_DATA_STATUS_M GENMASK(3, 0) #define YT921X_EDATA_DATA_STATUS(x) FIELD_PREP(YT921X_EDATA_DATA_STATUS_M, (x)) #define YT921X_EDATA_DATA_IDLE YT921X_EDATA_DATA_STATUS(3) +#define YT921X_SYS_CLK 0xe0040 +#define YT921X_SYS_CLK_SEL_M GENMASK(1, 0) /* unknown: 167M */ +#define YT9215_SYS_CLK_125M 0 +#define YT9218_SYS_CLK_167M 0 +#define YT921X_SYS_CLK_143M 1 #define YT921X_EXT_MBUS_OP 0x6a000 #define YT921X_INT_MBUS_OP 0xf0000 @@ -465,6 +471,42 @@ enum yt921x_app_selector { #define YT921X_LAG_HASH_MAC_DA BIT(1) #define YT921X_LAG_HASH_SRC_PORT BIT(0) +#define YT921X_PORTn_RATE(port) (0x220000 + 4 * (port)) +#define YT921X_PORT_RATE_GAP_VALUE GENMASK(4, 0) /* default 20 */ +#define YT921X_METER_SLOT 0x220104 +#define YT921X_METER_SLOT_SLOT_M GENMASK(11, 0) +#define YT921X_PORTn_METER(port) (0x220108 + 4 * (port)) +#define YT921X_PORT_METER_EN BIT(4) +#define YT921X_PORT_METER_ID_M GENMASK(3, 0) +#define YT921X_PORT_METER_ID(x) FIELD_PREP(YT921X_PORT_METER_ID_M, (x)) +#define YT921X_METERn_CTRL(x) (0x220800 + 0x10 * (x)) +#define YT921X_METER_CTRLc_METER_EN BIT(14) +#define YT921X_METER_CTRLc_TOKEN_OVERFLOW_EN BIT(13) /* RFC4115: yellow use unused green bw */ +#define YT921X_METER_CTRLc_DROP_M GENMASK(12, 11) +#define YT921X_METER_CTRLc_DROP(x) FIELD_PREP(YT921X_METER_CTRLc_DROP_M, (x)) +#define YT921X_METER_CTRLc_DROP_GYR YT921X_METER_CTRLc_DROP(0) +#define YT921X_METER_CTRLc_DROP_YR YT921X_METER_CTRLc_DROP(1) +#define YT921X_METER_CTRLc_DROP_R YT921X_METER_CTRLc_DROP(2) +#define YT921X_METER_CTRLc_DROP_NONE YT921X_METER_CTRLc_DROP(3) +#define YT921X_METER_CTRLc_COLOR_BLIND BIT(10) +#define YT921X_METER_CTRLc_UNIT_M GENMASK(9, 7) +#define YT921X_METER_CTRLc_UNIT(x) FIELD_PREP(YT921X_METER_CTRLc_UNIT_M, (x)) +#define YT921X_METER_CTRLc_BYTE_MODE_INCLUDE_GAP BIT(6) /* +GAP_VALUE bytes each packet */ +#define YT921X_METER_CTRLc_PKT_MODE BIT(5) /* 0: byte rate mode */ +#define YT921X_METER_CTRLc_RFC2698 BIT(4) /* 0: RFC4115 */ +#define YT921X_METER_CTRLbc_CBS_M GENMASK_ULL(35, 20) +#define YT921X_METER_CTRLbc_CBS(x) FIELD_PREP(YT921X_METER_CTRLbc_CBS_M, (x)) +#define YT921X_METER_CTRLb_CIR_M GENMASK(19, 2) +#define YT921X_METER_CTRLb_CIR(x) FIELD_PREP(YT921X_METER_CTRLb_CIR_M, (x)) +#define YT921X_METER_CTRLab_EBS_M GENMASK_ULL(33, 18) +#define YT921X_METER_CTRLab_EBS(x) FIELD_PREP(YT921X_METER_CTRLab_EBS_M, (x)) +#define YT921X_METER_CTRLa_EIR_M GENMASK(17, 0) +#define YT921X_METER_CTRLa_EIR(x) FIELD_PREP(YT921X_METER_CTRLa_EIR_M, (x)) +#define YT921X_METERn_STAT_EXCESS(x) (0x221000 + 8 * (x)) +#define YT921X_METERn_STAT_COMMITTED(x) (0x221004 + 8 * (x)) +#define YT921X_METER_STAT_TOKEN_M GENMASK(30, 15) +#define YT921X_METER_STAT_QUEUE_M GENMASK(14, 0) + #define YT921X_PORTn_VLAN_CTRL(port) (0x230010 + 4 * (port)) #define YT921X_PORT_VLAN_CTRL_SVLAN_PRIO_EN BIT(31) #define YT921X_PORT_VLAN_CTRL_CVLAN_PRIO_EN BIT(30) @@ -508,6 +550,16 @@ enum yt921x_fdb_entry_status { #define YT921X_MSTI_NUM 16 +#define YT921X_TOKEN_BYTE_C 1 /* 1 token = 2^1 byte */ +#define YT921X_TOKEN_PKT_C -6 /* 1 token = 2^-6 packets */ +#define YT921X_TOKEN_RATE_C -15 +/* for VLAN only, not including port meters */ +#define YT921X_METER_NUM 64 +#define YT921X_METER_SLOT_MIN 80 +#define YT921X_METER_UNIT_MAX ((1 << 3) - 1) +#define YT921X_METER_BURST_MAX ((1 << 16) - 1) +#define YT921X_METER_RATE_MAX ((1 << 18) - 1) + #define YT921X_LAG_NUM 2 #define YT921X_LAG_PORT_NUM 4 @@ -602,8 +654,10 @@ struct yt921x_priv { struct dsa_switch ds; const struct yt921x_info *info; + unsigned int meter_slot_ns; /* cache of dsa_cpu_ports(ds) */ u16 cpu_ports_mask; + u8 cycle_ns; /* protect the access to the switch registers */ struct mutex reg_lock; -- 2.53.0