drivers/net/ethernet/microchip/sparx5/sparx5_dcb.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /* Microchip Sparx5 Switch driver
   3  *
   4  * Copyright (c) 2022 Microchip Technology Inc. and its subsidiaries.
   5  */
   6
   7 #include <net/dcbnl.h>
   8
   9 #include "sparx5_port.h"
  10
  11 enum sparx5_dcb_apptrust_values {
  12         SPARX5_DCB_APPTRUST_EMPTY,
  13         SPARX5_DCB_APPTRUST_DSCP,
  14         SPARX5_DCB_APPTRUST_PCP,
  15         SPARX5_DCB_APPTRUST_DSCP_PCP,
  16         __SPARX5_DCB_APPTRUST_MAX
  17 };
  18
  19 static const struct sparx5_dcb_apptrust {
  20         u8 selectors[IEEE_8021QAZ_APP_SEL_MAX + 1];
  21         int nselectors;
  22 } *sparx5_port_apptrust[SPX5_PORTS];
  23
  24 static const char *sparx5_dcb_apptrust_names[__SPARX5_DCB_APPTRUST_MAX] = {
  25         [SPARX5_DCB_APPTRUST_EMPTY]    = "empty",
  26         [SPARX5_DCB_APPTRUST_DSCP]     = "dscp",
  27         [SPARX5_DCB_APPTRUST_PCP]      = "pcp",
  28         [SPARX5_DCB_APPTRUST_DSCP_PCP] = "dscp pcp"
  29 };
  30
  31 /* Sparx5 supported apptrust policies */
  32 static const struct sparx5_dcb_apptrust
  33         sparx5_dcb_apptrust_policies[__SPARX5_DCB_APPTRUST_MAX] = {
  34         /* Empty *must* be first */
  35         [SPARX5_DCB_APPTRUST_EMPTY]    = { { 0 }, 0 },
  36         [SPARX5_DCB_APPTRUST_DSCP]     = { { IEEE_8021QAZ_APP_SEL_DSCP }, 1 },
  37         [SPARX5_DCB_APPTRUST_PCP]      = { { DCB_APP_SEL_PCP }, 1 },
  38         [SPARX5_DCB_APPTRUST_DSCP_PCP] = { { IEEE_8021QAZ_APP_SEL_DSCP,
  39                                              DCB_APP_SEL_PCP }, 2 },
  40 };
  41
  42 /* Validate app entry.
  43  *
  44  * Check for valid selectors and valid protocol and priority ranges.
  45  */
  46 static int sparx5_dcb_app_validate(struct net_device *dev,
  47                                    const struct dcb_app *app)
  48 {
  49         int err = 0;
  50
  51         switch (app->selector) {
  52         /* Default priority checks */
  53         case IEEE_8021QAZ_APP_SEL_ETHERTYPE:
  54                 if (app->protocol != 0)
  55                         err = -EINVAL;
  56                 else if (app->priority >= SPX5_PRIOS)
  57                         err = -ERANGE;
  58                 break;
  59         /* Dscp checks */
  60         case IEEE_8021QAZ_APP_SEL_DSCP:
  61                 if (app->protocol >= SPARX5_PORT_QOS_DSCP_COUNT)
  62                         err = -EINVAL;
  63                 else if (app->priority >= SPX5_PRIOS)
  64                         err = -ERANGE;
  65                 break;
  66         /* Pcp checks */
  67         case DCB_APP_SEL_PCP:
  68                 if (app->protocol >= SPARX5_PORT_QOS_PCP_DEI_COUNT)
  69                         err = -EINVAL;
  70                 else if (app->priority >= SPX5_PRIOS)
  71                         err = -ERANGE;
  72                 break;
  73         default:
  74                 err = -EINVAL;
  75                 break;
  76         }
  77
  78         if (err)
  79                 netdev_err(dev, "Invalid entry: %d:%d\n", app->protocol,
  80                            app->priority);
  81
  82         return err;
  83 }
  84
  85 /* Validate apptrust configuration.
  86  *
  87  * Return index of supported apptrust configuration if valid, otherwise return
  88  * error.
  89  */
  90 static int sparx5_dcb_apptrust_validate(struct net_device *dev, u8 *selectors,
  91                                         int nselectors, int *err)
  92 {
  93         bool match = false;
  94         int i, ii;
  95
  96         for (i = 0; i < ARRAY_SIZE(sparx5_dcb_apptrust_policies); i++) {
  97                 if (sparx5_dcb_apptrust_policies[i].nselectors != nselectors)
  98                         continue;
  99                 match = true;
 100                 for (ii = 0; ii < nselectors; ii++) {
 101                         if (sparx5_dcb_apptrust_policies[i].selectors[ii] !=
 102                             *(selectors + ii)) {
 103                                 match = false;
 104                                 break;
 105                         }
 106                 }
 107                 if (match)
 108                         break;
 109         }
 110
 111         /* Requested trust configuration is not supported */
 112         if (!match) {
 113                 netdev_err(dev, "Valid apptrust configurations are:\n");
 114                 for (i = 0; i < ARRAY_SIZE(sparx5_dcb_apptrust_names); i++)
 115                         pr_info("order: %s\n", sparx5_dcb_apptrust_names[i]);
 116                 *err = -EOPNOTSUPP;
 117         }
 118
 119         return i;
 120 }
 121
 122 static bool sparx5_dcb_apptrust_contains(int portno, u8 selector)
 123 {
 124         const struct sparx5_dcb_apptrust *conf = sparx5_port_apptrust[portno];
 125         int i;
 126
 127         for (i = 0; i < conf->nselectors; i++)
 128                 if (conf->selectors[i] == selector)
 129                         return true;
 130
 131         return false;
 132 }
 133
 134 static int sparx5_dcb_app_update(struct net_device *dev)
 135 {
 136         struct dcb_ieee_app_prio_map dscp_rewr_map = {0};
 137         struct dcb_rewr_prio_pcp_map pcp_rewr_map = {0};
 138         struct sparx5_port *port = netdev_priv(dev);
 139         struct sparx5_port_qos_dscp_map *dscp_map;
 140         struct sparx5_port_qos_pcp_map *pcp_map;
 141         struct sparx5_port_qos qos = {0};
 142         struct dcb_app app_itr = {0};
 143         int portno = port->portno;
 144         bool dscp_rewr = false;
 145         bool pcp_rewr = false;
 146         u16 dscp;
 147         int i;
 148
 149         dscp_map = &qos.dscp.map;
 150         pcp_map = &qos.pcp.map;
 151
 152         /* Get default prio. */
 153         qos.default_prio = dcb_ieee_getapp_default_prio_mask(dev);
 154         if (qos.default_prio)
 155                 qos.default_prio = fls(qos.default_prio) - 1;
 156
 157         /* Get dscp ingress mapping */
 158         for (i = 0; i < ARRAY_SIZE(dscp_map->map); i++) {
 159                 app_itr.selector = IEEE_8021QAZ_APP_SEL_DSCP;
 160                 app_itr.protocol = i;
 161                 dscp_map->map[i] = dcb_getapp(dev, &app_itr);
 162         }
 163
 164         /* Get pcp ingress mapping */
 165         for (i = 0; i < ARRAY_SIZE(pcp_map->map); i++) {
 166                 app_itr.selector = DCB_APP_SEL_PCP;
 167                 app_itr.protocol = i;
 168                 pcp_map->map[i] = dcb_getapp(dev, &app_itr);
 169         }
 170
 171         /* Get pcp rewrite mapping */
 172         dcb_getrewr_prio_pcp_mask_map(dev, &pcp_rewr_map);
 173         for (i = 0; i < ARRAY_SIZE(pcp_rewr_map.map); i++) {
 174                 if (!pcp_rewr_map.map[i])
 175                         continue;
 176                 pcp_rewr = true;
 177                 qos.pcp_rewr.map.map[i] = fls(pcp_rewr_map.map[i]) - 1;
 178         }
 179
 180         /* Get dscp rewrite mapping */
 181         dcb_getrewr_prio_dscp_mask_map(dev, &dscp_rewr_map);
 182         for (i = 0; i < ARRAY_SIZE(dscp_rewr_map.map); i++) {
 183                 if (!dscp_rewr_map.map[i])
 184                         continue;
 185
 186                 /* The rewrite table of the switch has 32 entries; one for each
 187                  * priority for each DP level. Currently, the rewrite map does
 188                  * not indicate DP level, so we map classified QoS class to
 189                  * classified DSCP, for each classified DP level. Rewrite of
 190                  * DSCP is only enabled, if we have active mappings.
 191                  */
 192                 dscp_rewr = true;
 193                 dscp = fls64(dscp_rewr_map.map[i]) - 1;
 194                 qos.dscp_rewr.map.map[i] = dscp;      /* DP 0 */
 195                 qos.dscp_rewr.map.map[i + 8] = dscp;  /* DP 1 */
 196                 qos.dscp_rewr.map.map[i + 16] = dscp; /* DP 2 */
 197                 qos.dscp_rewr.map.map[i + 24] = dscp; /* DP 3 */
 198         }
 199
 200         /* Enable use of pcp for queue classification ? */
 201         if (sparx5_dcb_apptrust_contains(portno, DCB_APP_SEL_PCP)) {
 202                 qos.pcp.qos_enable = true;
 203                 qos.pcp.dp_enable = qos.pcp.qos_enable;
 204                 /* Enable rewrite of PCP and DEI if PCP is trusted *and* rewrite
 205                  * table is not empty.
 206                  */
 207                 if (pcp_rewr)
 208                         qos.pcp_rewr.enable = true;
 209         }
 210
 211         /* Enable use of dscp for queue classification ? */
 212         if (sparx5_dcb_apptrust_contains(portno, IEEE_8021QAZ_APP_SEL_DSCP)) {
 213                 qos.dscp.qos_enable = true;
 214                 qos.dscp.dp_enable = qos.dscp.qos_enable;
 215                 if (dscp_rewr)
 216                         /* Do not enable rewrite if no mappings are active, as
 217                          * classified DSCP will then be zero for all classified
 218                          * QoS class and DP combinations.
 219                          */
 220                         qos.dscp_rewr.enable = true;
 221         }
 222
 223         return sparx5_port_qos_set(port, &qos);
 224 }
 225
 226 /* Set or delete DSCP app entry.
 227  *
 228  * DSCP mapping is global for all ports, so set and delete app entries are
 229  * replicated for each port.
 230  */
 231 static int sparx5_dcb_ieee_dscp_setdel(struct net_device *dev,
 232                                        struct dcb_app *app,
 233                                        int (*setdel)(struct net_device *,
 234                                                      struct dcb_app *))
 235 {
 236         struct sparx5_port *port = netdev_priv(dev);
 237         struct sparx5_port *port_itr;
 238         int err, i;
 239
 240         for (i = 0; i < SPX5_PORTS; i++) {
 241                 port_itr = port->sparx5->ports[i];
 242                 if (!port_itr)
 243                         continue;
 244                 err = setdel(port_itr->ndev, app);
 245                 if (err)
 246                         return err;
 247         }
 248
 249         return 0;
 250 }
 251
 252 static int sparx5_dcb_ieee_delapp(struct net_device *dev, struct dcb_app *app)
 253 {
 254         int err;
 255
 256         if (app->selector == IEEE_8021QAZ_APP_SEL_DSCP)
 257                 err = sparx5_dcb_ieee_dscp_setdel(dev, app, dcb_ieee_delapp);
 258         else
 259                 err = dcb_ieee_delapp(dev, app);
 260
 261         if (err < 0)
 262                 return err;
 263
 264         return sparx5_dcb_app_update(dev);
 265 }
 266
 267 static int sparx5_dcb_ieee_setapp(struct net_device *dev, struct dcb_app *app)
 268 {
 269         struct dcb_app app_itr;
 270         int err = 0;
 271         u8 prio;
 272
 273         err = sparx5_dcb_app_validate(dev, app);
 274         if (err)
 275                 goto out;
 276
 277         /* Delete current mapping, if it exists */
 278         prio = dcb_getapp(dev, app);
 279         if (prio) {
 280                 app_itr = *app;
 281                 app_itr.priority = prio;
 282                 sparx5_dcb_ieee_delapp(dev, &app_itr);
 283         }
 284
 285         if (app->selector == IEEE_8021QAZ_APP_SEL_DSCP)
 286                 err = sparx5_dcb_ieee_dscp_setdel(dev, app, dcb_ieee_setapp);
 287         else
 288                 err = dcb_ieee_setapp(dev, app);
 289
 290         if (err)
 291                 goto out;
 292
 293         sparx5_dcb_app_update(dev);
 294
 295 out:
 296         return err;
 297 }
 298
 299 static int sparx5_dcb_setapptrust(struct net_device *dev, u8 *selectors,
 300                                   int nselectors)
 301 {
 302         struct sparx5_port *port = netdev_priv(dev);
 303         int err = 0, idx;
 304
 305         idx = sparx5_dcb_apptrust_validate(dev, selectors, nselectors, &err);
 306         if (err < 0)
 307                 return err;
 308
 309         sparx5_port_apptrust[port->portno] = &sparx5_dcb_apptrust_policies[idx];
 310
 311         return sparx5_dcb_app_update(dev);
 312 }
 313
 314 static int sparx5_dcb_getapptrust(struct net_device *dev, u8 *selectors,
 315                                   int *nselectors)
 316 {
 317         struct sparx5_port *port = netdev_priv(dev);
 318         const struct sparx5_dcb_apptrust *trust;
 319
 320         trust = sparx5_port_apptrust[port->portno];
 321
 322         memcpy(selectors, trust->selectors, trust->nselectors);
 323         *nselectors = trust->nselectors;
 324
 325         return 0;
 326 }
 327
 328 static int sparx5_dcb_delrewr(struct net_device *dev, struct dcb_app *app)
 329 {
 330         int err;
 331
 332         if (app->selector == IEEE_8021QAZ_APP_SEL_DSCP)
 333                 err = sparx5_dcb_ieee_dscp_setdel(dev, app, dcb_delrewr);
 334         else
 335                 err = dcb_delrewr(dev, app);
 336
 337         if (err < 0)
 338                 return err;
 339
 340         return sparx5_dcb_app_update(dev);
 341 }
 342
 343 static int sparx5_dcb_setrewr(struct net_device *dev, struct dcb_app *app)
 344 {
 345         struct dcb_app app_itr;
 346         int err = 0;
 347         u16 proto;
 348
 349         err = sparx5_dcb_app_validate(dev, app);
 350         if (err)
 351                 goto out;
 352
 353         /* Delete current mapping, if it exists. */
 354         proto = dcb_getrewr(dev, app);
 355         if (proto) {
 356                 app_itr = *app;
 357                 app_itr.protocol = proto;
 358                 sparx5_dcb_delrewr(dev, &app_itr);
 359         }
 360
 361         if (app->selector == IEEE_8021QAZ_APP_SEL_DSCP)
 362                 err = sparx5_dcb_ieee_dscp_setdel(dev, app, dcb_setrewr);
 363         else
 364                 err = dcb_setrewr(dev, app);
 365
 366         if (err)
 367                 goto out;
 368
 369         sparx5_dcb_app_update(dev);
 370
 371 out:
 372         return err;
 373 }
 374
 375 const struct dcbnl_rtnl_ops sparx5_dcbnl_ops = {
 376         .ieee_setapp = sparx5_dcb_ieee_setapp,
 377         .ieee_delapp = sparx5_dcb_ieee_delapp,
 378         .dcbnl_setapptrust = sparx5_dcb_setapptrust,
 379         .dcbnl_getapptrust = sparx5_dcb_getapptrust,
 380         .dcbnl_setrewr = sparx5_dcb_setrewr,
 381         .dcbnl_delrewr = sparx5_dcb_delrewr,
 382 };
 383
 384 int sparx5_dcb_init(struct sparx5 *sparx5)
 385 {
 386         struct sparx5_port *port;
 387         int i;
 388
 389         for (i = 0; i < SPX5_PORTS; i++) {
 390                 port = sparx5->ports[i];
 391                 if (!port)
 392                         continue;
 393                 port->ndev->dcbnl_ops = &sparx5_dcbnl_ops;
 394                 /* Initialize [dscp, pcp] default trust */
 395                 sparx5_port_apptrust[port->portno] =
 396                         &sparx5_dcb_apptrust_policies
 397                                 [SPARX5_DCB_APPTRUST_DSCP_PCP];
 398
 399                 /* Enable DSCP classification based on classified QoS class and
 400                  * DP, for all DSCP values, for all ports.
 401                  */
 402                 sparx5_port_qos_dscp_rewr_mode_set(port,
 403                                                    SPARX5_PORT_REW_DSCP_ALL);
 404         }
 405
 406         return 0;
 407 }