drivers/net/dsa/rtl8366.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 <linus.walleij@linaro.org>
   6  * Copyright (C) 2009-2010 Gabor Juhos <juhosg@openwrt.org>
   7  * Copyright (C) 2010 Antti Seppälä <a.seppala@gmail.com>
   8  * Copyright (C) 2010 Roman Yeryomin <roman@advem.lv>
   9  * Copyright (C) 2011 Colin Leitner <colin.leitner@googlemail.com>
  10  */
  11 #include <linux/if_bridge.h>
  12 #include <net/dsa.h>
  13
  14 #include "realtek-smi.h"
  15
  16 int rtl8366_mc_is_used(struct realtek_smi *smi, int mc_index, int *used)
  17 {
  18         int ret;
  19         int i;
  20
  21         *used = 0;
  22         for (i = 0; i < smi->num_ports; i++) {
  23                 int index = 0;
  24
  25                 ret = smi->ops->get_mc_index(smi, 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 int rtl8366_set_vlan(struct realtek_smi *smi, int vid, u32 member,
  40                      u32 untag, u32 fid)
  41 {
  42         struct rtl8366_vlan_4k vlan4k;
  43         int ret;
  44         int i;
  45
  46         /* Update the 4K table */
  47         ret = smi->ops->get_vlan_4k(smi, vid, &vlan4k);
  48         if (ret)
  49                 return ret;
  50
  51         vlan4k.member = member;
  52         vlan4k.untag = untag;
  53         vlan4k.fid = fid;
  54         ret = smi->ops->set_vlan_4k(smi, &vlan4k);
  55         if (ret)
  56                 return ret;
  57
  58         /* Try to find an existing MC entry for this VID */
  59         for (i = 0; i < smi->num_vlan_mc; i++) {
  60                 struct rtl8366_vlan_mc vlanmc;
  61
  62                 ret = smi->ops->get_vlan_mc(smi, i, &vlanmc);
  63                 if (ret)
  64                         return ret;
  65
  66                 if (vid == vlanmc.vid) {
  67                         /* update the MC entry */
  68                         vlanmc.member = member;
  69                         vlanmc.untag = untag;
  70                         vlanmc.fid = fid;
  71
  72                         ret = smi->ops->set_vlan_mc(smi, i, &vlanmc);
  73                         break;
  74                 }
  75         }
  76
  77         return ret;
  78 }
  79 EXPORT_SYMBOL_GPL(rtl8366_set_vlan);
  80
  81 int rtl8366_get_pvid(struct realtek_smi *smi, int port, int *val)
  82 {
  83         struct rtl8366_vlan_mc vlanmc;
  84         int ret;
  85         int index;
  86
  87         ret = smi->ops->get_mc_index(smi, port, &index);
  88         if (ret)
  89                 return ret;
  90
  91         ret = smi->ops->get_vlan_mc(smi, index, &vlanmc);
  92         if (ret)
  93                 return ret;
  94
  95         *val = vlanmc.vid;
  96         return 0;
  97 }
  98 EXPORT_SYMBOL_GPL(rtl8366_get_pvid);
  99
 100 int rtl8366_set_pvid(struct realtek_smi *smi, unsigned int port,
 101                      unsigned int vid)
 102 {
 103         struct rtl8366_vlan_mc vlanmc;
 104         struct rtl8366_vlan_4k vlan4k;
 105         int ret;
 106         int i;
 107
 108         /* Try to find an existing MC entry for this VID */
 109         for (i = 0; i < smi->num_vlan_mc; i++) {
 110                 ret = smi->ops->get_vlan_mc(smi, i, &vlanmc);
 111                 if (ret)
 112                         return ret;
 113
 114                 if (vid == vlanmc.vid) {
 115                         ret = smi->ops->set_vlan_mc(smi, i, &vlanmc);
 116                         if (ret)
 117                                 return ret;
 118
 119                         ret = smi->ops->set_mc_index(smi, port, i);
 120                         return ret;
 121                 }
 122         }
 123
 124         /* We have no MC entry for this VID, try to find an empty one */
 125         for (i = 0; i < smi->num_vlan_mc; i++) {
 126                 ret = smi->ops->get_vlan_mc(smi, i, &vlanmc);
 127                 if (ret)
 128                         return ret;
 129
 130                 if (vlanmc.vid == 0 && vlanmc.member == 0) {
 131                         /* Update the entry from the 4K table */
 132                         ret = smi->ops->get_vlan_4k(smi, vid, &vlan4k);
 133                         if (ret)
 134                                 return ret;
 135
 136                         vlanmc.vid = vid;
 137                         vlanmc.member = vlan4k.member;
 138                         vlanmc.untag = vlan4k.untag;
 139                         vlanmc.fid = vlan4k.fid;
 140                         ret = smi->ops->set_vlan_mc(smi, i, &vlanmc);
 141                         if (ret)
 142                                 return ret;
 143
 144                         ret = smi->ops->set_mc_index(smi, port, i);
 145                         return ret;
 146                 }
 147         }
 148
 149         /* MC table is full, try to find an unused entry and replace it */
 150         for (i = 0; i < smi->num_vlan_mc; i++) {
 151                 int used;
 152
 153                 ret = rtl8366_mc_is_used(smi, i, &used);
 154                 if (ret)
 155                         return ret;
 156
 157                 if (!used) {
 158                         /* Update the entry from the 4K table */
 159                         ret = smi->ops->get_vlan_4k(smi, vid, &vlan4k);
 160                         if (ret)
 161                                 return ret;
 162
 163                         vlanmc.vid = vid;
 164                         vlanmc.member = vlan4k.member;
 165                         vlanmc.untag = vlan4k.untag;
 166                         vlanmc.fid = vlan4k.fid;
 167                         ret = smi->ops->set_vlan_mc(smi, i, &vlanmc);
 168                         if (ret)
 169                                 return ret;
 170
 171                         ret = smi->ops->set_mc_index(smi, port, i);
 172                         return ret;
 173                 }
 174         }
 175
 176         dev_err(smi->dev,
 177                 "all VLAN member configurations are in use\n");
 178
 179         return -ENOSPC;
 180 }
 181 EXPORT_SYMBOL_GPL(rtl8366_set_pvid);
 182
 183 int rtl8366_enable_vlan4k(struct realtek_smi *smi, bool enable)
 184 {
 185         int ret;
 186
 187         /* To enable 4k VLAN, ordinary VLAN must be enabled first,
 188          * but if we disable 4k VLAN it is fine to leave ordinary
 189          * VLAN enabled.
 190          */
 191         if (enable) {
 192                 /* Make sure VLAN is ON */
 193                 ret = smi->ops->enable_vlan(smi, true);
 194                 if (ret)
 195                         return ret;
 196
 197                 smi->vlan_enabled = true;
 198         }
 199
 200         ret = smi->ops->enable_vlan4k(smi, enable);
 201         if (ret)
 202                 return ret;
 203
 204         smi->vlan4k_enabled = enable;
 205         return 0;
 206 }
 207 EXPORT_SYMBOL_GPL(rtl8366_enable_vlan4k);
 208
 209 int rtl8366_enable_vlan(struct realtek_smi *smi, bool enable)
 210 {
 211         int ret;
 212
 213         ret = smi->ops->enable_vlan(smi, enable);
 214         if (ret)
 215                 return ret;
 216
 217         smi->vlan_enabled = enable;
 218
 219         /* If we turn VLAN off, make sure that we turn off
 220          * 4k VLAN as well, if that happened to be on.
 221          */
 222         if (!enable) {
 223                 smi->vlan4k_enabled = false;
 224                 ret = smi->ops->enable_vlan4k(smi, false);
 225         }
 226
 227         return ret;
 228 }
 229 EXPORT_SYMBOL_GPL(rtl8366_enable_vlan);
 230
 231 int rtl8366_reset_vlan(struct realtek_smi *smi)
 232 {
 233         struct rtl8366_vlan_mc vlanmc;
 234         int ret;
 235         int i;
 236
 237         rtl8366_enable_vlan(smi, false);
 238         rtl8366_enable_vlan4k(smi, false);
 239
 240         /* Clear the 16 VLAN member configurations */
 241         vlanmc.vid = 0;
 242         vlanmc.priority = 0;
 243         vlanmc.member = 0;
 244         vlanmc.untag = 0;
 245         vlanmc.fid = 0;
 246         for (i = 0; i < smi->num_vlan_mc; i++) {
 247                 ret = smi->ops->set_vlan_mc(smi, i, &vlanmc);
 248                 if (ret)
 249                         return ret;
 250         }
 251
 252         return 0;
 253 }
 254 EXPORT_SYMBOL_GPL(rtl8366_reset_vlan);
 255
 256 int rtl8366_init_vlan(struct realtek_smi *smi)
 257 {
 258         int port;
 259         int ret;
 260
 261         ret = rtl8366_reset_vlan(smi);
 262         if (ret)
 263                 return ret;
 264
 265         /* Loop over the available ports, for each port, associate
 266          * it with the VLAN (port+1)
 267          */
 268         for (port = 0; port < smi->num_ports; port++) {
 269                 u32 mask;
 270
 271                 if (port == smi->cpu_port)
 272                         /* For the CPU port, make all ports members of this
 273                          * VLAN.
 274                          */
 275                         mask = GENMASK(smi->num_ports - 1, 0);
 276                 else
 277                         /* For all other ports, enable itself plus the
 278                          * CPU port.
 279                          */
 280                         mask = BIT(port) | BIT(smi->cpu_port);
 281
 282                 /* For each port, set the port as member of VLAN (port+1)
 283                  * and untagged, except for the CPU port: the CPU port (5) is
 284                  * member of VLAN 6 and so are ALL the other ports as well.
 285                  * Use filter 0 (no filter).
 286                  */
 287                 dev_info(smi->dev, "VLAN%d port mask for port %d, %08x\n",
 288                          (port + 1), port, mask);
 289                 ret = rtl8366_set_vlan(smi, (port + 1), mask, mask, 0);
 290                 if (ret)
 291                         return ret;
 292
 293                 dev_info(smi->dev, "VLAN%d port %d, PVID set to %d\n",
 294                          (port + 1), port, (port + 1));
 295                 ret = rtl8366_set_pvid(smi, port, (port + 1));
 296                 if (ret)
 297                         return ret;
 298         }
 299
 300         return rtl8366_enable_vlan(smi, true);
 301 }
 302 EXPORT_SYMBOL_GPL(rtl8366_init_vlan);
 303
 304 int rtl8366_vlan_filtering(struct dsa_switch *ds, int port, bool vlan_filtering)
 305 {
 306         struct realtek_smi *smi = ds->priv;
 307         struct rtl8366_vlan_4k vlan4k;
 308         int ret;
 309
 310         if (!smi->ops->is_vlan_valid(smi, port))
 311                 return -EINVAL;
 312
 313         dev_info(smi->dev, "%s filtering on port %d\n",
 314                  vlan_filtering ? "enable" : "disable",
 315                  port);
 316
 317         /* TODO:
 318          * The hardware support filter ID (FID) 0..7, I have no clue how to
 319          * support this in the driver when the callback only says on/off.
 320          */
 321         ret = smi->ops->get_vlan_4k(smi, port, &vlan4k);
 322         if (ret)
 323                 return ret;
 324
 325         /* Just set the filter to FID 1 for now then */
 326         ret = rtl8366_set_vlan(smi, port,
 327                                vlan4k.member,
 328                                vlan4k.untag,
 329                                1);
 330         if (ret)
 331                 return ret;
 332
 333         return 0;
 334 }
 335 EXPORT_SYMBOL_GPL(rtl8366_vlan_filtering);
 336
 337 int rtl8366_vlan_prepare(struct dsa_switch *ds, int port,
 338                          const struct switchdev_obj_port_vlan *vlan)
 339 {
 340         struct realtek_smi *smi = ds->priv;
 341         int ret;
 342
 343         if (!smi->ops->is_vlan_valid(smi, port))
 344                 return -EINVAL;
 345
 346         dev_info(smi->dev, "prepare VLANs %04x..%04x\n",
 347                  vlan->vid_begin, vlan->vid_end);
 348
 349         /* Enable VLAN in the hardware
 350          * FIXME: what's with this 4k business?
 351          * Just rtl8366_enable_vlan() seems inconclusive.
 352          */
 353         ret = rtl8366_enable_vlan4k(smi, true);
 354         if (ret)
 355                 return ret;
 356
 357         return 0;
 358 }
 359 EXPORT_SYMBOL_GPL(rtl8366_vlan_prepare);
 360
 361 void rtl8366_vlan_add(struct dsa_switch *ds, int port,
 362                       const struct switchdev_obj_port_vlan *vlan)
 363 {
 364         bool untagged = !!(vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED);
 365         bool pvid = !!(vlan->flags & BRIDGE_VLAN_INFO_PVID);
 366         struct realtek_smi *smi = ds->priv;
 367         u32 member = 0;
 368         u32 untag = 0;
 369         u16 vid;
 370         int ret;
 371
 372         if (!smi->ops->is_vlan_valid(smi, port))
 373                 return;
 374
 375         dev_info(smi->dev, "add VLAN on port %d, %s, %s\n",
 376                  port,
 377                  untagged ? "untagged" : "tagged",
 378                  pvid ? " PVID" : "no PVID");
 379
 380         if (dsa_is_dsa_port(ds, port) || dsa_is_cpu_port(ds, port))
 381                 dev_err(smi->dev, "port is DSA or CPU port\n");
 382
 383         for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
 384                 int pvid_val = 0;
 385
 386                 dev_info(smi->dev, "add VLAN %04x\n", vid);
 387                 member |= BIT(port);
 388
 389                 if (untagged)
 390                         untag |= BIT(port);
 391
 392                 /* To ensure that we have a valid MC entry for this VLAN,
 393                  * initialize the port VLAN ID here.
 394                  */
 395                 ret = rtl8366_get_pvid(smi, port, &pvid_val);
 396                 if (ret < 0) {
 397                         dev_err(smi->dev, "could not lookup PVID for port %d\n",
 398                                 port);
 399                         return;
 400                 }
 401                 if (pvid_val == 0) {
 402                         ret = rtl8366_set_pvid(smi, port, vid);
 403                         if (ret < 0)
 404                                 return;
 405                 }
 406         }
 407
 408         ret = rtl8366_set_vlan(smi, port, member, untag, 0);
 409         if (ret)
 410                 dev_err(smi->dev,
 411                         "failed to set up VLAN %04x",
 412                         vid);
 413 }
 414 EXPORT_SYMBOL_GPL(rtl8366_vlan_add);
 415
 416 int rtl8366_vlan_del(struct dsa_switch *ds, int port,
 417                      const struct switchdev_obj_port_vlan *vlan)
 418 {
 419         struct realtek_smi *smi = ds->priv;
 420         u16 vid;
 421         int ret;
 422
 423         dev_info(smi->dev, "del VLAN on port %d\n", port);
 424
 425         for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
 426                 int i;
 427
 428                 dev_info(smi->dev, "del VLAN %04x\n", vid);
 429
 430                 for (i = 0; i < smi->num_vlan_mc; i++) {
 431                         struct rtl8366_vlan_mc vlanmc;
 432
 433                         ret = smi->ops->get_vlan_mc(smi, i, &vlanmc);
 434                         if (ret)
 435                                 return ret;
 436
 437                         if (vid == vlanmc.vid) {
 438                                 /* clear VLAN member configurations */
 439                                 vlanmc.vid = 0;
 440                                 vlanmc.priority = 0;
 441                                 vlanmc.member = 0;
 442                                 vlanmc.untag = 0;
 443                                 vlanmc.fid = 0;
 444
 445                                 ret = smi->ops->set_vlan_mc(smi, i, &vlanmc);
 446                                 if (ret) {
 447                                         dev_err(smi->dev,
 448                                                 "failed to remove VLAN %04x\n",
 449                                                 vid);
 450                                         return ret;
 451                                 }
 452                                 break;
 453                         }
 454                 }
 455         }
 456
 457         return 0;
 458 }
 459 EXPORT_SYMBOL_GPL(rtl8366_vlan_del);
 460
 461 void rtl8366_get_strings(struct dsa_switch *ds, int port, u32 stringset,
 462                          uint8_t *data)
 463 {
 464         struct realtek_smi *smi = ds->priv;
 465         struct rtl8366_mib_counter *mib;
 466         int i;
 467
 468         if (port >= smi->num_ports)
 469                 return;
 470
 471         for (i = 0; i < smi->num_mib_counters; i++) {
 472                 mib = &smi->mib_counters[i];
 473                 strncpy(data + i * ETH_GSTRING_LEN,
 474                         mib->name, ETH_GSTRING_LEN);
 475         }
 476 }
 477 EXPORT_SYMBOL_GPL(rtl8366_get_strings);
 478
 479 int rtl8366_get_sset_count(struct dsa_switch *ds, int port, int sset)
 480 {
 481         struct realtek_smi *smi = ds->priv;
 482
 483         /* We only support SS_STATS */
 484         if (sset != ETH_SS_STATS)
 485                 return 0;
 486         if (port >= smi->num_ports)
 487                 return -EINVAL;
 488
 489         return smi->num_mib_counters;
 490 }
 491 EXPORT_SYMBOL_GPL(rtl8366_get_sset_count);
 492
 493 void rtl8366_get_ethtool_stats(struct dsa_switch *ds, int port, uint64_t *data)
 494 {
 495         struct realtek_smi *smi = ds->priv;
 496         int i;
 497         int ret;
 498
 499         if (port >= smi->num_ports)
 500                 return;
 501
 502         for (i = 0; i < smi->num_mib_counters; i++) {
 503                 struct rtl8366_mib_counter *mib;
 504                 u64 mibvalue = 0;
 505
 506                 mib = &smi->mib_counters[i];
 507                 ret = smi->ops->get_mib_counter(smi, port, mib, &mibvalue);
 508                 if (ret) {
 509                         dev_err(smi->dev, "error reading MIB counter %s\n",
 510                                 mib->name);
 511                 }
 512                 data[i] = mibvalue;
 513         }
 514 }
 515 EXPORT_SYMBOL_GPL(rtl8366_get_ethtool_stats);