drivers/net/ethernet/mscc/ocelot_police.c

   1 // SPDX-License-Identifier: (GPL-2.0 OR MIT)
   2 /* Microsemi Ocelot Switch driver
   3  *
   4  * Copyright (c) 2019 Microsemi Corporation
   5  */
   6
   7 #include <soc/mscc/ocelot.h>
   8 #include "ocelot_police.h"
   9
  10 /* Types for ANA:POL[0-192]:POL_MODE_CFG.FRM_MODE */
  11 #define POL_MODE_LINERATE   0 /* Incl IPG. Unit: 33 1/3 kbps, 4096 bytes */
  12 #define POL_MODE_DATARATE   1 /* Excl IPG. Unit: 33 1/3 kbps, 4096 bytes  */
  13 #define POL_MODE_FRMRATE_HI 2 /* Unit: 33 1/3 fps, 32.8 frames */
  14 #define POL_MODE_FRMRATE_LO 3 /* Unit: 1/3 fps, 0.3 frames */
  15
  16 /* Policer indexes */
  17 #define POL_IX_PORT    0    /* 0-11    : Port policers */
  18 #define POL_IX_QUEUE   32   /* 32-127  : Queue policers  */
  19
  20 /* Default policer order */
  21 #define POL_ORDER 0x1d3 /* Ocelot policer order: Serial (QoS -> Port -> VCAP) */
  22
  23 int qos_policer_conf_set(struct ocelot *ocelot, int port, u32 pol_ix,
  24                          struct qos_policer_conf *conf)
  25 {
  26         u32 cf = 0, cir_ena = 0, frm_mode = POL_MODE_LINERATE;
  27         u32 cir = 0, cbs = 0, pir = 0, pbs = 0;
  28         bool cir_discard = 0, pir_discard = 0;
  29         u32 pbs_max = 0, cbs_max = 0;
  30         u8 ipg = 20;
  31         u32 value;
  32
  33         pir = conf->pir;
  34         pbs = conf->pbs;
  35
  36         switch (conf->mode) {
  37         case MSCC_QOS_RATE_MODE_LINE:
  38         case MSCC_QOS_RATE_MODE_DATA:
  39                 if (conf->mode == MSCC_QOS_RATE_MODE_LINE) {
  40                         frm_mode = POL_MODE_LINERATE;
  41                         ipg = min_t(u8, GENMASK(4, 0), conf->ipg);
  42                 } else {
  43                         frm_mode = POL_MODE_DATARATE;
  44                 }
  45                 if (conf->dlb) {
  46                         cir_ena = 1;
  47                         cir = conf->cir;
  48                         cbs = conf->cbs;
  49                         if (cir == 0 && cbs == 0) {
  50                                 /* Discard cir frames */
  51                                 cir_discard = 1;
  52                         } else {
  53                                 cir = DIV_ROUND_UP(cir, 100);
  54                                 cir *= 3; /* 33 1/3 kbps */
  55                                 cbs = DIV_ROUND_UP(cbs, 4096);
  56                                 cbs = (cbs ? cbs : 1); /* No zero burst size */
  57                                 cbs_max = 60; /* Limit burst size */
  58                                 cf = conf->cf;
  59                                 if (cf)
  60                                         pir += conf->cir;
  61                         }
  62                 }
  63                 if (pir == 0 && pbs == 0) {
  64                         /* Discard PIR frames */
  65                         pir_discard = 1;
  66                 } else {
  67                         pir = DIV_ROUND_UP(pir, 100);
  68                         pir *= 3;  /* 33 1/3 kbps */
  69                         pbs = DIV_ROUND_UP(pbs, 4096);
  70                         pbs = (pbs ? pbs : 1); /* No zero burst size */
  71                         pbs_max = 60; /* Limit burst size */
  72                 }
  73                 break;
  74         case MSCC_QOS_RATE_MODE_FRAME:
  75                 if (pir >= 100) {
  76                         frm_mode = POL_MODE_FRMRATE_HI;
  77                         pir = DIV_ROUND_UP(pir, 100);
  78                         pir *= 3;  /* 33 1/3 fps */
  79                         pbs = (pbs * 10) / 328; /* 32.8 frames */
  80                         pbs = (pbs ? pbs : 1); /* No zero burst size */
  81                         pbs_max = GENMASK(6, 0); /* Limit burst size */
  82                 } else {
  83                         frm_mode = POL_MODE_FRMRATE_LO;
  84                         if (pir == 0 && pbs == 0) {
  85                                 /* Discard all frames */
  86                                 pir_discard = 1;
  87                                 cir_discard = 1;
  88                         } else {
  89                                 pir *= 3; /* 1/3 fps */
  90                                 pbs = (pbs * 10) / 3; /* 0.3 frames */
  91                                 pbs = (pbs ? pbs : 1); /* No zero burst size */
  92                                 pbs_max = 61; /* Limit burst size */
  93                         }
  94                 }
  95                 break;
  96         default: /* MSCC_QOS_RATE_MODE_DISABLED */
  97                 /* Disable policer using maximum rate and zero burst */
  98                 pir = GENMASK(15, 0);
  99                 pbs = 0;
 100                 break;
 101         }
 102
 103         /* Check limits */
 104         if (pir > GENMASK(15, 0)) {
 105                 dev_err(ocelot->dev, "Invalid pir for port %d: %u (max %lu)\n",
 106                         port, pir, GENMASK(15, 0));
 107                 return -EINVAL;
 108         }
 109
 110         if (cir > GENMASK(15, 0)) {
 111                 dev_err(ocelot->dev, "Invalid cir for port %d: %u (max %lu)\n",
 112                         port, cir, GENMASK(15, 0));
 113                 return -EINVAL;
 114         }
 115
 116         if (pbs > pbs_max) {
 117                 dev_err(ocelot->dev, "Invalid pbs for port %d: %u (max %u)\n",
 118                         port, pbs, pbs_max);
 119                 return -EINVAL;
 120         }
 121
 122         if (cbs > cbs_max) {
 123                 dev_err(ocelot->dev, "Invalid cbs for port %d: %u (max %u)\n",
 124                         port, cbs, cbs_max);
 125                 return -EINVAL;
 126         }
 127
 128         value = (ANA_POL_MODE_CFG_IPG_SIZE(ipg) |
 129                  ANA_POL_MODE_CFG_FRM_MODE(frm_mode) |
 130                  (cf ? ANA_POL_MODE_CFG_DLB_COUPLED : 0) |
 131                  (cir_ena ? ANA_POL_MODE_CFG_CIR_ENA : 0) |
 132                  ANA_POL_MODE_CFG_OVERSHOOT_ENA);
 133
 134         ocelot_write_gix(ocelot, value, ANA_POL_MODE_CFG, pol_ix);
 135
 136         ocelot_write_gix(ocelot,
 137                          ANA_POL_PIR_CFG_PIR_RATE(pir) |
 138                          ANA_POL_PIR_CFG_PIR_BURST(pbs),
 139                          ANA_POL_PIR_CFG, pol_ix);
 140
 141         ocelot_write_gix(ocelot,
 142                          (pir_discard ? GENMASK(22, 0) : 0),
 143                          ANA_POL_PIR_STATE, pol_ix);
 144
 145         ocelot_write_gix(ocelot,
 146                          ANA_POL_CIR_CFG_CIR_RATE(cir) |
 147                          ANA_POL_CIR_CFG_CIR_BURST(cbs),
 148                          ANA_POL_CIR_CFG, pol_ix);
 149
 150         ocelot_write_gix(ocelot,
 151                          (cir_discard ? GENMASK(22, 0) : 0),
 152                          ANA_POL_CIR_STATE, pol_ix);
 153
 154         return 0;
 155 }
 156
 157 int ocelot_port_policer_add(struct ocelot *ocelot, int port,
 158                             struct ocelot_policer *pol)
 159 {
 160         struct qos_policer_conf pp = { 0 };
 161         int err;
 162
 163         if (!pol)
 164                 return -EINVAL;
 165
 166         pp.mode = MSCC_QOS_RATE_MODE_DATA;
 167         pp.pir = pol->rate;
 168         pp.pbs = pol->burst;
 169
 170         dev_dbg(ocelot->dev, "%s: port %u pir %u kbps, pbs %u bytes\n",
 171                 __func__, port, pp.pir, pp.pbs);
 172
 173         err = qos_policer_conf_set(ocelot, port, POL_IX_PORT + port, &pp);
 174         if (err)
 175                 return err;
 176
 177         ocelot_rmw_gix(ocelot,
 178                        ANA_PORT_POL_CFG_PORT_POL_ENA |
 179                        ANA_PORT_POL_CFG_POL_ORDER(POL_ORDER),
 180                        ANA_PORT_POL_CFG_PORT_POL_ENA |
 181                        ANA_PORT_POL_CFG_POL_ORDER_M,
 182                        ANA_PORT_POL_CFG, port);
 183
 184         return 0;
 185 }
 186 EXPORT_SYMBOL(ocelot_port_policer_add);
 187
 188 int ocelot_port_policer_del(struct ocelot *ocelot, int port)
 189 {
 190         struct qos_policer_conf pp = { 0 };
 191         int err;
 192
 193         dev_dbg(ocelot->dev, "%s: port %u\n", __func__, port);
 194
 195         pp.mode = MSCC_QOS_RATE_MODE_DISABLED;
 196
 197         err = qos_policer_conf_set(ocelot, port, POL_IX_PORT + port, &pp);
 198         if (err)
 199                 return err;
 200
 201         ocelot_rmw_gix(ocelot,
 202                        ANA_PORT_POL_CFG_POL_ORDER(POL_ORDER),
 203                        ANA_PORT_POL_CFG_PORT_POL_ENA |
 204                        ANA_PORT_POL_CFG_POL_ORDER_M,
 205                        ANA_PORT_POL_CFG, port);
 206
 207         return 0;
 208 }
 209 EXPORT_SYMBOL(ocelot_port_policer_del);