diff options
Diffstat (limited to 'drivers/net/ethernet/mscc/ocelot_police.c')
| -rw-r--r-- | drivers/net/ethernet/mscc/ocelot_police.c | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mscc/ocelot_police.c b/drivers/net/ethernet/mscc/ocelot_police.c new file mode 100644 index 000000000..7e1f67be3 --- /dev/null +++ b/drivers/net/ethernet/mscc/ocelot_police.c @@ -0,0 +1,254 @@ +// SPDX-License-Identifier: (GPL-2.0 OR MIT) +/* Microsemi Ocelot Switch driver + * + * Copyright (c) 2019 Microsemi Corporation + */ + +#include <soc/mscc/ocelot.h> +#include "ocelot_police.h" + +/* Types for ANA:POL[0-192]:POL_MODE_CFG.FRM_MODE */ +#define POL_MODE_LINERATE 0 /* Incl IPG. Unit: 33 1/3 kbps, 4096 bytes */ +#define POL_MODE_DATARATE 1 /* Excl IPG. Unit: 33 1/3 kbps, 4096 bytes */ +#define POL_MODE_FRMRATE_HI 2 /* Unit: 33 1/3 fps, 32.8 frames */ +#define POL_MODE_FRMRATE_LO 3 /* Unit: 1/3 fps, 0.3 frames */ + +/* Policer indexes */ +#define POL_IX_PORT 0 /* 0-11 : Port policers */ +#define POL_IX_QUEUE 32 /* 32-127 : Queue policers */ + +/* Default policer order */ +#define POL_ORDER 0x1d3 /* Ocelot policer order: Serial (QoS -> Port -> VCAP) */ + +int qos_policer_conf_set(struct ocelot *ocelot, u32 pol_ix, + struct qos_policer_conf *conf) +{ + u32 cf = 0, cir_ena = 0, frm_mode = POL_MODE_LINERATE; + u32 cir = 0, cbs = 0, pir = 0, pbs = 0; + bool cir_discard = 0, pir_discard = 0; + u32 pbs_max = 0, cbs_max = 0; + u8 ipg = 20; + u32 value; + + pir = conf->pir; + pbs = conf->pbs; + + switch (conf->mode) { + case MSCC_QOS_RATE_MODE_LINE: + case MSCC_QOS_RATE_MODE_DATA: + if (conf->mode == MSCC_QOS_RATE_MODE_LINE) { + frm_mode = POL_MODE_LINERATE; + ipg = min_t(u8, GENMASK(4, 0), conf->ipg); + } else { + frm_mode = POL_MODE_DATARATE; + } + if (conf->dlb) { + cir_ena = 1; + cir = conf->cir; + cbs = conf->cbs; + if (cir == 0 && cbs == 0) { + /* Discard cir frames */ + cir_discard = 1; + } else { + cir = DIV_ROUND_UP(cir, 100); + cir *= 3; /* 33 1/3 kbps */ + cbs = DIV_ROUND_UP(cbs, 4096); + cbs = (cbs ? cbs : 1); /* No zero burst size */ + cbs_max = 60; /* Limit burst size */ + cf = conf->cf; + if (cf) + pir += conf->cir; + } + } + if (pir == 0 && pbs == 0) { + /* Discard PIR frames */ + pir_discard = 1; + } else { + pir = DIV_ROUND_UP(pir, 100); + pir *= 3; /* 33 1/3 kbps */ + pbs = DIV_ROUND_UP(pbs, 4096); + pbs = (pbs ? pbs : 1); /* No zero burst size */ + pbs_max = 60; /* Limit burst size */ + } + break; + case MSCC_QOS_RATE_MODE_FRAME: + if (pir >= 100) { + frm_mode = POL_MODE_FRMRATE_HI; + pir = DIV_ROUND_UP(pir, 100); + pir *= 3; /* 33 1/3 fps */ + pbs = (pbs * 10) / 328; /* 32.8 frames */ + pbs = (pbs ? pbs : 1); /* No zero burst size */ + pbs_max = GENMASK(6, 0); /* Limit burst size */ + } else { + frm_mode = POL_MODE_FRMRATE_LO; + if (pir == 0 && pbs == 0) { + /* Discard all frames */ + pir_discard = 1; + cir_discard = 1; + } else { + pir *= 3; /* 1/3 fps */ + pbs = (pbs * 10) / 3; /* 0.3 frames */ + pbs = (pbs ? pbs : 1); /* No zero burst size */ + pbs_max = 61; /* Limit burst size */ + } + } + break; + default: /* MSCC_QOS_RATE_MODE_DISABLED */ + /* Disable policer using maximum rate and zero burst */ + pir = GENMASK(15, 0); + pbs = 0; + break; + } + + /* Check limits */ + if (pir > GENMASK(15, 0)) { + dev_err(ocelot->dev, + "Invalid pir for policer %u: %u (max %lu)\n", + pol_ix, pir, GENMASK(15, 0)); + return -EINVAL; + } + + if (cir > GENMASK(15, 0)) { + dev_err(ocelot->dev, + "Invalid cir for policer %u: %u (max %lu)\n", + pol_ix, cir, GENMASK(15, 0)); + return -EINVAL; + } + + if (pbs > pbs_max) { + dev_err(ocelot->dev, + "Invalid pbs for policer %u: %u (max %u)\n", + pol_ix, pbs, pbs_max); + return -EINVAL; + } + + if (cbs > cbs_max) { + dev_err(ocelot->dev, + "Invalid cbs for policer %u: %u (max %u)\n", + pol_ix, cbs, cbs_max); + return -EINVAL; + } + + value = (ANA_POL_MODE_CFG_IPG_SIZE(ipg) | + ANA_POL_MODE_CFG_FRM_MODE(frm_mode) | + (cf ? ANA_POL_MODE_CFG_DLB_COUPLED : 0) | + (cir_ena ? ANA_POL_MODE_CFG_CIR_ENA : 0) | + ANA_POL_MODE_CFG_OVERSHOOT_ENA); + + ocelot_write_gix(ocelot, value, ANA_POL_MODE_CFG, pol_ix); + + ocelot_write_gix(ocelot, + ANA_POL_PIR_CFG_PIR_RATE(pir) | + ANA_POL_PIR_CFG_PIR_BURST(pbs), + ANA_POL_PIR_CFG, pol_ix); + + ocelot_write_gix(ocelot, + (pir_discard ? GENMASK(22, 0) : 0), + ANA_POL_PIR_STATE, pol_ix); + + ocelot_write_gix(ocelot, + ANA_POL_CIR_CFG_CIR_RATE(cir) | + ANA_POL_CIR_CFG_CIR_BURST(cbs), + ANA_POL_CIR_CFG, pol_ix); + + ocelot_write_gix(ocelot, + (cir_discard ? GENMASK(22, 0) : 0), + ANA_POL_CIR_STATE, pol_ix); + + return 0; +} + +int ocelot_policer_validate(const struct flow_action *action, + const struct flow_action_entry *a, + struct netlink_ext_ack *extack) +{ + if (a->police.exceed.act_id != FLOW_ACTION_DROP) { + NL_SET_ERR_MSG_MOD(extack, + "Offload not supported when exceed action is not drop"); + return -EOPNOTSUPP; + } + + if (a->police.notexceed.act_id != FLOW_ACTION_PIPE && + a->police.notexceed.act_id != FLOW_ACTION_ACCEPT) { + NL_SET_ERR_MSG_MOD(extack, + "Offload not supported when conform action is not pipe or ok"); + return -EOPNOTSUPP; + } + + if (a->police.notexceed.act_id == FLOW_ACTION_ACCEPT && + !flow_action_is_last_entry(action, a)) { + NL_SET_ERR_MSG_MOD(extack, + "Offload not supported when conform action is ok, but police action is not last"); + return -EOPNOTSUPP; + } + + if (a->police.peakrate_bytes_ps || + a->police.avrate || a->police.overhead) { + NL_SET_ERR_MSG_MOD(extack, + "Offload not supported when peakrate/avrate/overhead is configured"); + return -EOPNOTSUPP; + } + + if (a->police.rate_pkt_ps) { + NL_SET_ERR_MSG_MOD(extack, + "Offload does not support packets per second"); + return -EOPNOTSUPP; + } + + return 0; +} +EXPORT_SYMBOL(ocelot_policer_validate); + +int ocelot_port_policer_add(struct ocelot *ocelot, int port, + struct ocelot_policer *pol) +{ + struct qos_policer_conf pp = { 0 }; + int err; + + if (!pol) + return -EINVAL; + + pp.mode = MSCC_QOS_RATE_MODE_DATA; + pp.pir = pol->rate; + pp.pbs = pol->burst; + + dev_dbg(ocelot->dev, "%s: port %u pir %u kbps, pbs %u bytes\n", + __func__, port, pp.pir, pp.pbs); + + err = qos_policer_conf_set(ocelot, POL_IX_PORT + port, &pp); + if (err) + return err; + + ocelot_rmw_gix(ocelot, + ANA_PORT_POL_CFG_PORT_POL_ENA | + ANA_PORT_POL_CFG_POL_ORDER(POL_ORDER), + ANA_PORT_POL_CFG_PORT_POL_ENA | + ANA_PORT_POL_CFG_POL_ORDER_M, + ANA_PORT_POL_CFG, port); + + return 0; +} +EXPORT_SYMBOL(ocelot_port_policer_add); + +int ocelot_port_policer_del(struct ocelot *ocelot, int port) +{ + struct qos_policer_conf pp = { 0 }; + int err; + + dev_dbg(ocelot->dev, "%s: port %u\n", __func__, port); + + pp.mode = MSCC_QOS_RATE_MODE_DISABLED; + + err = qos_policer_conf_set(ocelot, POL_IX_PORT + port, &pp); + if (err) + return err; + + ocelot_rmw_gix(ocelot, + ANA_PORT_POL_CFG_POL_ORDER(POL_ORDER), + ANA_PORT_POL_CFG_PORT_POL_ENA | + ANA_PORT_POL_CFG_POL_ORDER_M, + ANA_PORT_POL_CFG, port); + + return 0; +} +EXPORT_SYMBOL(ocelot_port_policer_del); |