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// SPDX-License-Identifier: (GPL-2.0 OR MIT)
/* Microsemi Ocelot Switch driver
*
* Copyright (c) 2019 Microsemi Corporation
*/
#include "ocelot_police.h"
enum mscc_qos_rate_mode {
MSCC_QOS_RATE_MODE_DISABLED, /* Policer/shaper disabled */
MSCC_QOS_RATE_MODE_LINE, /* Measure line rate in kbps incl. IPG */
MSCC_QOS_RATE_MODE_DATA, /* Measures data rate in kbps excl. IPG */
MSCC_QOS_RATE_MODE_FRAME, /* Measures frame rate in fps */
__MSCC_QOS_RATE_MODE_END,
NUM_MSCC_QOS_RATE_MODE = __MSCC_QOS_RATE_MODE_END,
MSCC_QOS_RATE_MODE_MAX = __MSCC_QOS_RATE_MODE_END - 1,
};
/* 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) */
struct qos_policer_conf {
enum mscc_qos_rate_mode mode;
bool dlb; /* Enable DLB (dual leaky bucket mode */
bool cf; /* Coupling flag (ignored in SLB mode) */
u32 cir; /* CIR in kbps/fps (ignored in SLB mode) */
u32 cbs; /* CBS in bytes/frames (ignored in SLB mode) */
u32 pir; /* PIR in kbps/fps */
u32 pbs; /* PBS in bytes/frames */
u8 ipg; /* Size of IPG when MSCC_QOS_RATE_MODE_LINE is chosen */
};
static int qos_policer_conf_set(struct ocelot *ocelot, int port, 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 port %d: %u (max %lu)\n",
port, pir, GENMASK(15, 0));
return -EINVAL;
}
if (cir > GENMASK(15, 0)) {
dev_err(ocelot->dev, "Invalid cir for port %d: %u (max %lu)\n",
port, cir, GENMASK(15, 0));
return -EINVAL;
}
if (pbs > pbs_max) {
dev_err(ocelot->dev, "Invalid pbs for port %d: %u (max %u)\n",
port, pbs, pbs_max);
return -EINVAL;
}
if (cbs > cbs_max) {
dev_err(ocelot->dev, "Invalid cbs for port %d: %u (max %u)\n",
port, 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_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, port, 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;
}
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, port, 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;
}
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