drivers/net/dsa/realtek/rtl8366-core.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Realtek SMI library helpers for the RTL8366x variants
   3  * RTL8366RB and RTL8366S
   4  *
   5  * Copyright (C) 2017 Linus Walleij <[email protected]>
   6  * Copyright (C) 2009-2010 Gabor Juhos <[email protected]>
   7  * Copyright (C) 2010 Antti Seppälä <[email protected]>
   8  * Copyright (C) 2010 Roman Yeryomin <[email protected]>
   9  * Copyright (C) 2011 Colin Leitner <[email protected]>
  10  */
  11 #include <linux/if_bridge.h>
  12 #include <net/dsa.h>
  13
  14 #include "realtek.h"
  15
  16 int rtl8366_mc_is_used(struct realtek_priv *priv, int mc_index, int *used)
  17 {
  18         int ret;
  19         int i;
  20
  21         *used = 0;
  22         for (i = 0; i < priv->num_ports; i++) {
  23                 int index = 0;
  24
  25                 ret = priv->ops->get_mc_index(priv, i, &index);
  26                 if (ret)
  27                         return ret;
  28
  29                 if (mc_index == index) {
  30                         *used = 1;
  31                         break;
  32                 }
  33         }
  34
  35         return 0;
  36 }
  37 EXPORT_SYMBOL_GPL(rtl8366_mc_is_used);
  38
  39 /**
  40  * rtl8366_obtain_mc() - retrieve or allocate a VLAN member configuration
  41  * @priv: the Realtek SMI device instance
  42  * @vid: the VLAN ID to look up or allocate
  43  * @vlanmc: the pointer will be assigned to a pointer to a valid member config
  44  * if successful
  45  * @return: index of a new member config or negative error number
  46  */
  47 static int rtl8366_obtain_mc(struct realtek_priv *priv, int vid,
  48                              struct rtl8366_vlan_mc *vlanmc)
  49 {
  50         struct rtl8366_vlan_4k vlan4k;
  51         int ret;
  52         int i;
  53
  54         /* Try to find an existing member config entry for this VID */
  55         for (i = 0; i < priv->num_vlan_mc; i++) {
  56                 ret = priv->ops->get_vlan_mc(priv, i, vlanmc);
  57                 if (ret) {
  58                         dev_err(priv->dev, "error searching for VLAN MC %d for VID %d\n",
  59                                 i, vid);
  60                         return ret;
  61                 }
  62
  63                 if (vid == vlanmc->vid)
  64                         return i;
  65         }
  66
  67         /* We have no MC entry for this VID, try to find an empty one */
  68         for (i = 0; i < priv->num_vlan_mc; i++) {
  69                 ret = priv->ops->get_vlan_mc(priv, i, vlanmc);
  70                 if (ret) {
  71                         dev_err(priv->dev, "error searching for VLAN MC %d for VID %d\n",
  72                                 i, vid);
  73                         return ret;
  74                 }
  75
  76                 if (vlanmc->vid == 0 && vlanmc->member == 0) {
  77                         /* Update the entry from the 4K table */
  78                         ret = priv->ops->get_vlan_4k(priv, vid, &vlan4k);
  79                         if (ret) {
  80                                 dev_err(priv->dev, "error looking for 4K VLAN MC %d for VID %d\n",
  81                                         i, vid);
  82                                 return ret;
  83                         }
  84
  85                         vlanmc->vid = vid;
  86                         vlanmc->member = vlan4k.member;
  87                         vlanmc->untag = vlan4k.untag;
  88                         vlanmc->fid = vlan4k.fid;
  89                         ret = priv->ops->set_vlan_mc(priv, i, vlanmc);
  90                         if (ret) {
  91                                 dev_err(priv->dev, "unable to set/update VLAN MC %d for VID %d\n",
  92                                         i, vid);
  93                                 return ret;
  94                         }
  95
  96                         dev_dbg(priv->dev, "created new MC at index %d for VID %d\n",
  97                                 i, vid);
  98                         return i;
  99                 }
 100         }
 101
 102         /* MC table is full, try to find an unused entry and replace it */
 103         for (i = 0; i < priv->num_vlan_mc; i++) {
 104                 int used;
 105
 106                 ret = rtl8366_mc_is_used(priv, i, &used);
 107                 if (ret)
 108                         return ret;
 109
 110                 if (!used) {
 111                         /* Update the entry from the 4K table */
 112                         ret = priv->ops->get_vlan_4k(priv, vid, &vlan4k);
 113                         if (ret)
 114                                 return ret;
 115
 116                         vlanmc->vid = vid;
 117                         vlanmc->member = vlan4k.member;
 118                         vlanmc->untag = vlan4k.untag;
 119                         vlanmc->fid = vlan4k.fid;
 120                         ret = priv->ops->set_vlan_mc(priv, i, vlanmc);
 121                         if (ret) {
 122                                 dev_err(priv->dev, "unable to set/update VLAN MC %d for VID %d\n",
 123                                         i, vid);
 124                                 return ret;
 125                         }
 126                         dev_dbg(priv->dev, "recycled MC at index %i for VID %d\n",
 127                                 i, vid);
 128                         return i;
 129                 }
 130         }
 131
 132         dev_err(priv->dev, "all VLAN member configurations are in use\n");
 133         return -ENOSPC;
 134 }
 135
 136 int rtl8366_set_vlan(struct realtek_priv *priv, int vid, u32 member,
 137                      u32 untag, u32 fid)
 138 {
 139         struct rtl8366_vlan_mc vlanmc;
 140         struct rtl8366_vlan_4k vlan4k;
 141         int mc;
 142         int ret;
 143
 144         if (!priv->ops->is_vlan_valid(priv, vid))
 145                 return -EINVAL;
 146
 147         dev_dbg(priv->dev,
 148                 "setting VLAN%d 4k members: 0x%02x, untagged: 0x%02x\n",
 149                 vid, member, untag);
 150
 151         /* Update the 4K table */
 152         ret = priv->ops->get_vlan_4k(priv, vid, &vlan4k);
 153         if (ret)
 154                 return ret;
 155
 156         vlan4k.member |= member;
 157         vlan4k.untag |= untag;
 158         vlan4k.fid = fid;
 159         ret = priv->ops->set_vlan_4k(priv, &vlan4k);
 160         if (ret)
 161                 return ret;
 162
 163         dev_dbg(priv->dev,
 164                 "resulting VLAN%d 4k members: 0x%02x, untagged: 0x%02x\n",
 165                 vid, vlan4k.member, vlan4k.untag);
 166
 167         /* Find or allocate a member config for this VID */
 168         ret = rtl8366_obtain_mc(priv, vid, &vlanmc);
 169         if (ret < 0)
 170                 return ret;
 171         mc = ret;
 172
 173         /* Update the MC entry */
 174         vlanmc.member |= member;
 175         vlanmc.untag |= untag;
 176         vlanmc.fid = fid;
 177
 178         /* Commit updates to the MC entry */
 179         ret = priv->ops->set_vlan_mc(priv, mc, &vlanmc);
 180         if (ret)
 181                 dev_err(priv->dev, "failed to commit changes to VLAN MC index %d for VID %d\n",
 182                         mc, vid);
 183         else
 184                 dev_dbg(priv->dev,
 185                         "resulting VLAN%d MC members: 0x%02x, untagged: 0x%02x\n",
 186                         vid, vlanmc.member, vlanmc.untag);
 187
 188         return ret;
 189 }
 190 EXPORT_SYMBOL_GPL(rtl8366_set_vlan);
 191
 192 int rtl8366_set_pvid(struct realtek_priv *priv, unsigned int port,
 193                      unsigned int vid)
 194 {
 195         struct rtl8366_vlan_mc vlanmc;
 196         int mc;
 197         int ret;
 198
 199         if (!priv->ops->is_vlan_valid(priv, vid))
 200                 return -EINVAL;
 201
 202         /* Find or allocate a member config for this VID */
 203         ret = rtl8366_obtain_mc(priv, vid, &vlanmc);
 204         if (ret < 0)
 205                 return ret;
 206         mc = ret;
 207
 208         ret = priv->ops->set_mc_index(priv, port, mc);
 209         if (ret) {
 210                 dev_err(priv->dev, "set PVID: failed to set MC index %d for port %d\n",
 211                         mc, port);
 212                 return ret;
 213         }
 214
 215         dev_dbg(priv->dev, "set PVID: the PVID for port %d set to %d using existing MC index %d\n",
 216                 port, vid, mc);
 217
 218         return 0;
 219 }
 220 EXPORT_SYMBOL_GPL(rtl8366_set_pvid);
 221
 222 int rtl8366_enable_vlan4k(struct realtek_priv *priv, bool enable)
 223 {
 224         int ret;
 225
 226         /* To enable 4k VLAN, ordinary VLAN must be enabled first,
 227          * but if we disable 4k VLAN it is fine to leave ordinary
 228          * VLAN enabled.
 229          */
 230         if (enable) {
 231                 /* Make sure VLAN is ON */
 232                 ret = priv->ops->enable_vlan(priv, true);
 233                 if (ret)
 234                         return ret;
 235
 236                 priv->vlan_enabled = true;
 237         }
 238
 239         ret = priv->ops->enable_vlan4k(priv, enable);
 240         if (ret)
 241                 return ret;
 242
 243         priv->vlan4k_enabled = enable;
 244         return 0;
 245 }
 246 EXPORT_SYMBOL_GPL(rtl8366_enable_vlan4k);
 247
 248 int rtl8366_enable_vlan(struct realtek_priv *priv, bool enable)
 249 {
 250         int ret;
 251
 252         ret = priv->ops->enable_vlan(priv, enable);
 253         if (ret)
 254                 return ret;
 255
 256         priv->vlan_enabled = enable;
 257
 258         /* If we turn VLAN off, make sure that we turn off
 259          * 4k VLAN as well, if that happened to be on.
 260          */
 261         if (!enable) {
 262                 priv->vlan4k_enabled = false;
 263                 ret = priv->ops->enable_vlan4k(priv, false);
 264         }
 265
 266         return ret;
 267 }
 268 EXPORT_SYMBOL_GPL(rtl8366_enable_vlan);
 269
 270 int rtl8366_reset_vlan(struct realtek_priv *priv)
 271 {
 272         struct rtl8366_vlan_mc vlanmc;
 273         int ret;
 274         int i;
 275
 276         rtl8366_enable_vlan(priv, false);
 277         rtl8366_enable_vlan4k(priv, false);
 278
 279         /* Clear the 16 VLAN member configurations */
 280         vlanmc.vid = 0;
 281         vlanmc.priority = 0;
 282         vlanmc.member = 0;
 283         vlanmc.untag = 0;
 284         vlanmc.fid = 0;
 285         for (i = 0; i < priv->num_vlan_mc; i++) {
 286                 ret = priv->ops->set_vlan_mc(priv, i, &vlanmc);
 287                 if (ret)
 288                         return ret;
 289         }
 290
 291         return 0;
 292 }
 293 EXPORT_SYMBOL_GPL(rtl8366_reset_vlan);
 294
 295 int rtl8366_vlan_add(struct dsa_switch *ds, int port,
 296                      const struct switchdev_obj_port_vlan *vlan,
 297                      struct netlink_ext_ack *extack)
 298 {
 299         bool untagged = !!(vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED);
 300         bool pvid = !!(vlan->flags & BRIDGE_VLAN_INFO_PVID);
 301         struct realtek_priv *priv = ds->priv;
 302         u32 member = 0;
 303         u32 untag = 0;
 304         int ret;
 305
 306         if (!priv->ops->is_vlan_valid(priv, vlan->vid)) {
 307                 NL_SET_ERR_MSG_MOD(extack, "VLAN ID not valid");
 308                 return -EINVAL;
 309         }
 310
 311         /* Enable VLAN in the hardware
 312          * FIXME: what's with this 4k business?
 313          * Just rtl8366_enable_vlan() seems inconclusive.
 314          */
 315         ret = rtl8366_enable_vlan4k(priv, true);
 316         if (ret) {
 317                 NL_SET_ERR_MSG_MOD(extack, "Failed to enable VLAN 4K");
 318                 return ret;
 319         }
 320
 321         dev_dbg(priv->dev, "add VLAN %d on port %d, %s, %s\n",
 322                 vlan->vid, port, untagged ? "untagged" : "tagged",
 323                 pvid ? "PVID" : "no PVID");
 324
 325         member |= BIT(port);
 326
 327         if (untagged)
 328                 untag |= BIT(port);
 329
 330         ret = rtl8366_set_vlan(priv, vlan->vid, member, untag, 0);
 331         if (ret) {
 332                 dev_err(priv->dev, "failed to set up VLAN %04x", vlan->vid);
 333                 return ret;
 334         }
 335
 336         if (!pvid)
 337                 return 0;
 338
 339         ret = rtl8366_set_pvid(priv, port, vlan->vid);
 340         if (ret) {
 341                 dev_err(priv->dev, "failed to set PVID on port %d to VLAN %04x",
 342                         port, vlan->vid);
 343                 return ret;
 344         }
 345
 346         return 0;
 347 }
 348 EXPORT_SYMBOL_GPL(rtl8366_vlan_add);
 349
 350 int rtl8366_vlan_del(struct dsa_switch *ds, int port,
 351                      const struct switchdev_obj_port_vlan *vlan)
 352 {
 353         struct realtek_priv *priv = ds->priv;
 354         int ret, i;
 355
 356         dev_dbg(priv->dev, "del VLAN %d on port %d\n", vlan->vid, port);
 357
 358         for (i = 0; i < priv->num_vlan_mc; i++) {
 359                 struct rtl8366_vlan_mc vlanmc;
 360
 361                 ret = priv->ops->get_vlan_mc(priv, i, &vlanmc);
 362                 if (ret)
 363                         return ret;
 364
 365                 if (vlan->vid == vlanmc.vid) {
 366                         /* Remove this port from the VLAN */
 367                         vlanmc.member &= ~BIT(port);
 368                         vlanmc.untag &= ~BIT(port);
 369                         /*
 370                          * If no ports are members of this VLAN
 371                          * anymore then clear the whole member
 372                          * config so it can be reused.
 373                          */
 374                         if (!vlanmc.member) {
 375                                 vlanmc.vid = 0;
 376                                 vlanmc.priority = 0;
 377                                 vlanmc.fid = 0;
 378                         }
 379                         ret = priv->ops->set_vlan_mc(priv, i, &vlanmc);
 380                         if (ret) {
 381                                 dev_err(priv->dev,
 382                                         "failed to remove VLAN %04x\n",
 383                                         vlan->vid);
 384                                 return ret;
 385                         }
 386                         break;
 387                 }
 388         }
 389
 390         return 0;
 391 }
 392 EXPORT_SYMBOL_GPL(rtl8366_vlan_del);
 393
 394 void rtl8366_get_strings(struct dsa_switch *ds, int port, u32 stringset,
 395                          uint8_t *data)
 396 {
 397         struct realtek_priv *priv = ds->priv;
 398         struct rtl8366_mib_counter *mib;
 399         int i;
 400
 401         if (port >= priv->num_ports)
 402                 return;
 403
 404         for (i = 0; i < priv->num_mib_counters; i++) {
 405                 mib = &priv->mib_counters[i];
 406                 strncpy(data + i * ETH_GSTRING_LEN,
 407                         mib->name, ETH_GSTRING_LEN);
 408         }
 409 }
 410 EXPORT_SYMBOL_GPL(rtl8366_get_strings);
 411
 412 int rtl8366_get_sset_count(struct dsa_switch *ds, int port, int sset)
 413 {
 414         struct realtek_priv *priv = ds->priv;
 415
 416         /* We only support SS_STATS */
 417         if (sset != ETH_SS_STATS)
 418                 return 0;
 419         if (port >= priv->num_ports)
 420                 return -EINVAL;
 421
 422         return priv->num_mib_counters;
 423 }
 424 EXPORT_SYMBOL_GPL(rtl8366_get_sset_count);
 425
 426 void rtl8366_get_ethtool_stats(struct dsa_switch *ds, int port, uint64_t *data)
 427 {
 428         struct realtek_priv *priv = ds->priv;
 429         int i;
 430         int ret;
 431
 432         if (port >= priv->num_ports)
 433                 return;
 434
 435         for (i = 0; i < priv->num_mib_counters; i++) {
 436                 struct rtl8366_mib_counter *mib;
 437                 u64 mibvalue = 0;
 438
 439                 mib = &priv->mib_counters[i];
 440                 ret = priv->ops->get_mib_counter(priv, port, mib, &mibvalue);
 441                 if (ret) {
 442                         dev_err(priv->dev, "error reading MIB counter %s\n",
 443                                 mib->name);
 444                 }
 445                 data[i] = mibvalue;
 446         }
 447 }
 448 EXPORT_SYMBOL_GPL(rtl8366_get_ethtool_stats);