Ido Schimmel | f00817d | 2016-04-06 17:10:09 +0200 | [diff] [blame] | 1 | /* |
| 2 | * drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c |
| 3 | * Copyright (c) 2016 Mellanox Technologies. All rights reserved. |
| 4 | * Copyright (c) 2016 Ido Schimmel <idosch@mellanox.com> |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions are met: |
| 8 | * |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * 3. Neither the names of the copyright holders nor the names of its |
| 15 | * contributors may be used to endorse or promote products derived from |
| 16 | * this software without specific prior written permission. |
| 17 | * |
| 18 | * Alternatively, this software may be distributed under the terms of the |
| 19 | * GNU General Public License ("GPL") version 2 as published by the Free |
| 20 | * Software Foundation. |
| 21 | * |
| 22 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| 23 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| 26 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 27 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 28 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 29 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 30 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 31 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 32 | * POSSIBILITY OF SUCH DAMAGE. |
| 33 | */ |
| 34 | |
| 35 | #include <linux/netdevice.h> |
Ido Schimmel | 8e8dfe9 | 2016-04-06 17:10:10 +0200 | [diff] [blame] | 36 | #include <linux/string.h> |
Ido Schimmel | f00817d | 2016-04-06 17:10:09 +0200 | [diff] [blame] | 37 | #include <net/dcbnl.h> |
| 38 | |
| 39 | #include "spectrum.h" |
Ido Schimmel | 8e8dfe9 | 2016-04-06 17:10:10 +0200 | [diff] [blame] | 40 | #include "reg.h" |
Ido Schimmel | f00817d | 2016-04-06 17:10:09 +0200 | [diff] [blame] | 41 | |
| 42 | static u8 mlxsw_sp_dcbnl_getdcbx(struct net_device __always_unused *dev) |
| 43 | { |
| 44 | return DCB_CAP_DCBX_HOST | DCB_CAP_DCBX_VER_IEEE; |
| 45 | } |
| 46 | |
| 47 | static u8 mlxsw_sp_dcbnl_setdcbx(struct net_device __always_unused *dev, |
| 48 | u8 mode) |
| 49 | { |
| 50 | return (mode != (DCB_CAP_DCBX_HOST | DCB_CAP_DCBX_VER_IEEE)) ? 1 : 0; |
| 51 | } |
| 52 | |
Ido Schimmel | 8e8dfe9 | 2016-04-06 17:10:10 +0200 | [diff] [blame] | 53 | static int mlxsw_sp_dcbnl_ieee_getets(struct net_device *dev, |
| 54 | struct ieee_ets *ets) |
| 55 | { |
| 56 | struct mlxsw_sp_port *mlxsw_sp_port = netdev_priv(dev); |
| 57 | |
| 58 | memcpy(ets, mlxsw_sp_port->dcb.ets, sizeof(*ets)); |
| 59 | |
| 60 | return 0; |
| 61 | } |
| 62 | |
| 63 | static int mlxsw_sp_port_ets_validate(struct mlxsw_sp_port *mlxsw_sp_port, |
| 64 | struct ieee_ets *ets) |
| 65 | { |
| 66 | struct net_device *dev = mlxsw_sp_port->dev; |
| 67 | bool has_ets_tc = false; |
| 68 | int i, tx_bw_sum = 0; |
| 69 | |
| 70 | for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) { |
| 71 | switch (ets->tc_tsa[i]) { |
| 72 | case IEEE_8021QAZ_TSA_STRICT: |
| 73 | break; |
| 74 | case IEEE_8021QAZ_TSA_ETS: |
| 75 | has_ets_tc = true; |
| 76 | tx_bw_sum += ets->tc_tx_bw[i]; |
| 77 | break; |
| 78 | default: |
| 79 | netdev_err(dev, "Only strict priority and ETS are supported\n"); |
| 80 | return -EINVAL; |
| 81 | } |
| 82 | |
| 83 | if (ets->prio_tc[i] >= IEEE_8021QAZ_MAX_TCS) { |
| 84 | netdev_err(dev, "Invalid TC\n"); |
| 85 | return -EINVAL; |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | if (has_ets_tc && tx_bw_sum != 100) { |
| 90 | netdev_err(dev, "Total ETS bandwidth should equal 100\n"); |
| 91 | return -EINVAL; |
| 92 | } |
| 93 | |
| 94 | return 0; |
| 95 | } |
| 96 | |
| 97 | static int mlxsw_sp_port_pg_prio_map(struct mlxsw_sp_port *mlxsw_sp_port, |
| 98 | u8 *prio_tc) |
| 99 | { |
| 100 | char pptb_pl[MLXSW_REG_PPTB_LEN]; |
| 101 | int i; |
| 102 | |
| 103 | mlxsw_reg_pptb_pack(pptb_pl, mlxsw_sp_port->local_port); |
| 104 | for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) |
| 105 | mlxsw_reg_pptb_prio_to_buff_set(pptb_pl, i, prio_tc[i]); |
| 106 | return mlxsw_reg_write(mlxsw_sp_port->mlxsw_sp->core, MLXSW_REG(pptb), |
| 107 | pptb_pl); |
| 108 | } |
| 109 | |
| 110 | static bool mlxsw_sp_ets_has_pg(u8 *prio_tc, u8 pg) |
| 111 | { |
| 112 | int i; |
| 113 | |
| 114 | for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) |
| 115 | if (prio_tc[i] == pg) |
| 116 | return true; |
| 117 | return false; |
| 118 | } |
| 119 | |
| 120 | static int mlxsw_sp_port_pg_destroy(struct mlxsw_sp_port *mlxsw_sp_port, |
| 121 | u8 *old_prio_tc, u8 *new_prio_tc) |
| 122 | { |
| 123 | struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp; |
| 124 | char pbmc_pl[MLXSW_REG_PBMC_LEN]; |
| 125 | int err, i; |
| 126 | |
| 127 | mlxsw_reg_pbmc_pack(pbmc_pl, mlxsw_sp_port->local_port, 0, 0); |
| 128 | err = mlxsw_reg_query(mlxsw_sp->core, MLXSW_REG(pbmc), pbmc_pl); |
| 129 | if (err) |
| 130 | return err; |
| 131 | |
| 132 | for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) { |
| 133 | u8 pg = old_prio_tc[i]; |
| 134 | |
| 135 | if (!mlxsw_sp_ets_has_pg(new_prio_tc, pg)) |
| 136 | mlxsw_reg_pbmc_lossy_buffer_pack(pbmc_pl, pg, 0); |
| 137 | } |
| 138 | |
| 139 | return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(pbmc), pbmc_pl); |
| 140 | } |
| 141 | |
| 142 | static int mlxsw_sp_port_headroom_set(struct mlxsw_sp_port *mlxsw_sp_port, |
| 143 | struct ieee_ets *ets) |
| 144 | { |
| 145 | struct ieee_ets *my_ets = mlxsw_sp_port->dcb.ets; |
| 146 | struct net_device *dev = mlxsw_sp_port->dev; |
| 147 | int err; |
| 148 | |
| 149 | /* Create the required PGs, but don't destroy existing ones, as |
| 150 | * traffic is still directed to them. |
| 151 | */ |
| 152 | err = __mlxsw_sp_port_headroom_set(mlxsw_sp_port, dev->mtu, |
| 153 | ets->prio_tc); |
| 154 | if (err) { |
| 155 | netdev_err(dev, "Failed to configure port's headroom\n"); |
| 156 | return err; |
| 157 | } |
| 158 | |
| 159 | err = mlxsw_sp_port_pg_prio_map(mlxsw_sp_port, ets->prio_tc); |
| 160 | if (err) { |
| 161 | netdev_err(dev, "Failed to set PG-priority mapping\n"); |
| 162 | goto err_port_prio_pg_map; |
| 163 | } |
| 164 | |
| 165 | err = mlxsw_sp_port_pg_destroy(mlxsw_sp_port, my_ets->prio_tc, |
| 166 | ets->prio_tc); |
| 167 | if (err) |
| 168 | netdev_warn(dev, "Failed to remove ununsed PGs\n"); |
| 169 | |
| 170 | return 0; |
| 171 | |
| 172 | err_port_prio_pg_map: |
| 173 | mlxsw_sp_port_pg_destroy(mlxsw_sp_port, ets->prio_tc, my_ets->prio_tc); |
| 174 | return err; |
| 175 | } |
| 176 | |
| 177 | static int __mlxsw_sp_dcbnl_ieee_setets(struct mlxsw_sp_port *mlxsw_sp_port, |
| 178 | struct ieee_ets *ets) |
| 179 | { |
| 180 | struct ieee_ets *my_ets = mlxsw_sp_port->dcb.ets; |
| 181 | struct net_device *dev = mlxsw_sp_port->dev; |
| 182 | int i, err; |
| 183 | |
| 184 | /* Egress configuration. */ |
| 185 | for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) { |
| 186 | bool dwrr = ets->tc_tsa[i] == IEEE_8021QAZ_TSA_ETS; |
| 187 | u8 weight = ets->tc_tx_bw[i]; |
| 188 | |
| 189 | err = mlxsw_sp_port_ets_set(mlxsw_sp_port, |
| 190 | MLXSW_REG_QEEC_HIERARCY_SUBGROUP, i, |
| 191 | 0, dwrr, weight); |
| 192 | if (err) { |
| 193 | netdev_err(dev, "Failed to link subgroup ETS element %d to group\n", |
| 194 | i); |
| 195 | goto err_port_ets_set; |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) { |
| 200 | err = mlxsw_sp_port_prio_tc_set(mlxsw_sp_port, i, |
| 201 | ets->prio_tc[i]); |
| 202 | if (err) { |
| 203 | netdev_err(dev, "Failed to map prio %d to TC %d\n", i, |
| 204 | ets->prio_tc[i]); |
| 205 | goto err_port_prio_tc_set; |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | /* Ingress configuration. */ |
| 210 | err = mlxsw_sp_port_headroom_set(mlxsw_sp_port, ets); |
| 211 | if (err) |
| 212 | goto err_port_headroom_set; |
| 213 | |
| 214 | return 0; |
| 215 | |
| 216 | err_port_headroom_set: |
| 217 | i = IEEE_8021QAZ_MAX_TCS; |
| 218 | err_port_prio_tc_set: |
| 219 | for (i--; i >= 0; i--) |
| 220 | mlxsw_sp_port_prio_tc_set(mlxsw_sp_port, i, my_ets->prio_tc[i]); |
| 221 | i = IEEE_8021QAZ_MAX_TCS; |
| 222 | err_port_ets_set: |
| 223 | for (i--; i >= 0; i--) { |
| 224 | bool dwrr = my_ets->tc_tsa[i] == IEEE_8021QAZ_TSA_ETS; |
| 225 | u8 weight = my_ets->tc_tx_bw[i]; |
| 226 | |
| 227 | err = mlxsw_sp_port_ets_set(mlxsw_sp_port, |
| 228 | MLXSW_REG_QEEC_HIERARCY_SUBGROUP, i, |
| 229 | 0, dwrr, weight); |
| 230 | } |
| 231 | return err; |
| 232 | } |
| 233 | |
| 234 | static int mlxsw_sp_dcbnl_ieee_setets(struct net_device *dev, |
| 235 | struct ieee_ets *ets) |
| 236 | { |
| 237 | struct mlxsw_sp_port *mlxsw_sp_port = netdev_priv(dev); |
| 238 | int err; |
| 239 | |
| 240 | err = mlxsw_sp_port_ets_validate(mlxsw_sp_port, ets); |
| 241 | if (err) |
| 242 | return err; |
| 243 | |
| 244 | err = __mlxsw_sp_dcbnl_ieee_setets(mlxsw_sp_port, ets); |
| 245 | if (err) |
| 246 | return err; |
| 247 | |
| 248 | memcpy(mlxsw_sp_port->dcb.ets, ets, sizeof(*ets)); |
| 249 | |
| 250 | return 0; |
| 251 | } |
| 252 | |
Ido Schimmel | cc7cf51 | 2016-04-06 17:10:11 +0200 | [diff] [blame^] | 253 | static int mlxsw_sp_dcbnl_ieee_getmaxrate(struct net_device *dev, |
| 254 | struct ieee_maxrate *maxrate) |
| 255 | { |
| 256 | struct mlxsw_sp_port *mlxsw_sp_port = netdev_priv(dev); |
| 257 | |
| 258 | memcpy(maxrate, mlxsw_sp_port->dcb.maxrate, sizeof(*maxrate)); |
| 259 | |
| 260 | return 0; |
| 261 | } |
| 262 | |
| 263 | static int mlxsw_sp_dcbnl_ieee_setmaxrate(struct net_device *dev, |
| 264 | struct ieee_maxrate *maxrate) |
| 265 | { |
| 266 | struct mlxsw_sp_port *mlxsw_sp_port = netdev_priv(dev); |
| 267 | struct ieee_maxrate *my_maxrate = mlxsw_sp_port->dcb.maxrate; |
| 268 | int err, i; |
| 269 | |
| 270 | for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) { |
| 271 | err = mlxsw_sp_port_ets_maxrate_set(mlxsw_sp_port, |
| 272 | MLXSW_REG_QEEC_HIERARCY_SUBGROUP, |
| 273 | i, 0, |
| 274 | maxrate->tc_maxrate[i]); |
| 275 | if (err) { |
| 276 | netdev_err(dev, "Failed to set maxrate for TC %d\n", i); |
| 277 | goto err_port_ets_maxrate_set; |
| 278 | } |
| 279 | } |
| 280 | |
| 281 | memcpy(mlxsw_sp_port->dcb.maxrate, maxrate, sizeof(*maxrate)); |
| 282 | |
| 283 | return 0; |
| 284 | |
| 285 | err_port_ets_maxrate_set: |
| 286 | for (i--; i >= 0; i--) |
| 287 | mlxsw_sp_port_ets_maxrate_set(mlxsw_sp_port, |
| 288 | MLXSW_REG_QEEC_HIERARCY_SUBGROUP, |
| 289 | i, 0, my_maxrate->tc_maxrate[i]); |
| 290 | return err; |
| 291 | } |
| 292 | |
Ido Schimmel | f00817d | 2016-04-06 17:10:09 +0200 | [diff] [blame] | 293 | static const struct dcbnl_rtnl_ops mlxsw_sp_dcbnl_ops = { |
Ido Schimmel | 8e8dfe9 | 2016-04-06 17:10:10 +0200 | [diff] [blame] | 294 | .ieee_getets = mlxsw_sp_dcbnl_ieee_getets, |
| 295 | .ieee_setets = mlxsw_sp_dcbnl_ieee_setets, |
Ido Schimmel | cc7cf51 | 2016-04-06 17:10:11 +0200 | [diff] [blame^] | 296 | .ieee_getmaxrate = mlxsw_sp_dcbnl_ieee_getmaxrate, |
| 297 | .ieee_setmaxrate = mlxsw_sp_dcbnl_ieee_setmaxrate, |
Ido Schimmel | 8e8dfe9 | 2016-04-06 17:10:10 +0200 | [diff] [blame] | 298 | |
Ido Schimmel | f00817d | 2016-04-06 17:10:09 +0200 | [diff] [blame] | 299 | .getdcbx = mlxsw_sp_dcbnl_getdcbx, |
| 300 | .setdcbx = mlxsw_sp_dcbnl_setdcbx, |
| 301 | }; |
| 302 | |
Ido Schimmel | 8e8dfe9 | 2016-04-06 17:10:10 +0200 | [diff] [blame] | 303 | static int mlxsw_sp_port_ets_init(struct mlxsw_sp_port *mlxsw_sp_port) |
| 304 | { |
| 305 | mlxsw_sp_port->dcb.ets = kzalloc(sizeof(*mlxsw_sp_port->dcb.ets), |
| 306 | GFP_KERNEL); |
| 307 | if (!mlxsw_sp_port->dcb.ets) |
| 308 | return -ENOMEM; |
| 309 | |
| 310 | mlxsw_sp_port->dcb.ets->ets_cap = IEEE_8021QAZ_MAX_TCS; |
| 311 | |
| 312 | return 0; |
| 313 | } |
| 314 | |
| 315 | static void mlxsw_sp_port_ets_fini(struct mlxsw_sp_port *mlxsw_sp_port) |
| 316 | { |
| 317 | kfree(mlxsw_sp_port->dcb.ets); |
| 318 | } |
| 319 | |
Ido Schimmel | cc7cf51 | 2016-04-06 17:10:11 +0200 | [diff] [blame^] | 320 | static int mlxsw_sp_port_maxrate_init(struct mlxsw_sp_port *mlxsw_sp_port) |
| 321 | { |
| 322 | int i; |
| 323 | |
| 324 | mlxsw_sp_port->dcb.maxrate = kmalloc(sizeof(*mlxsw_sp_port->dcb.maxrate), |
| 325 | GFP_KERNEL); |
| 326 | if (!mlxsw_sp_port->dcb.maxrate) |
| 327 | return -ENOMEM; |
| 328 | |
| 329 | for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) |
| 330 | mlxsw_sp_port->dcb.maxrate->tc_maxrate[i] = MLXSW_REG_QEEC_MAS_DIS; |
| 331 | |
| 332 | return 0; |
| 333 | } |
| 334 | |
| 335 | static void mlxsw_sp_port_maxrate_fini(struct mlxsw_sp_port *mlxsw_sp_port) |
| 336 | { |
| 337 | kfree(mlxsw_sp_port->dcb.maxrate); |
| 338 | } |
| 339 | |
Ido Schimmel | f00817d | 2016-04-06 17:10:09 +0200 | [diff] [blame] | 340 | int mlxsw_sp_port_dcb_init(struct mlxsw_sp_port *mlxsw_sp_port) |
| 341 | { |
Ido Schimmel | 8e8dfe9 | 2016-04-06 17:10:10 +0200 | [diff] [blame] | 342 | int err; |
| 343 | |
| 344 | err = mlxsw_sp_port_ets_init(mlxsw_sp_port); |
| 345 | if (err) |
| 346 | return err; |
Ido Schimmel | cc7cf51 | 2016-04-06 17:10:11 +0200 | [diff] [blame^] | 347 | err = mlxsw_sp_port_maxrate_init(mlxsw_sp_port); |
| 348 | if (err) |
| 349 | goto err_port_maxrate_init; |
Ido Schimmel | 8e8dfe9 | 2016-04-06 17:10:10 +0200 | [diff] [blame] | 350 | |
Ido Schimmel | f00817d | 2016-04-06 17:10:09 +0200 | [diff] [blame] | 351 | mlxsw_sp_port->dev->dcbnl_ops = &mlxsw_sp_dcbnl_ops; |
| 352 | |
| 353 | return 0; |
Ido Schimmel | cc7cf51 | 2016-04-06 17:10:11 +0200 | [diff] [blame^] | 354 | |
| 355 | err_port_maxrate_init: |
| 356 | mlxsw_sp_port_ets_fini(mlxsw_sp_port); |
| 357 | return err; |
Ido Schimmel | f00817d | 2016-04-06 17:10:09 +0200 | [diff] [blame] | 358 | } |
| 359 | |
| 360 | void mlxsw_sp_port_dcb_fini(struct mlxsw_sp_port *mlxsw_sp_port) |
| 361 | { |
Ido Schimmel | cc7cf51 | 2016-04-06 17:10:11 +0200 | [diff] [blame^] | 362 | mlxsw_sp_port_maxrate_fini(mlxsw_sp_port); |
Ido Schimmel | 8e8dfe9 | 2016-04-06 17:10:10 +0200 | [diff] [blame] | 363 | mlxsw_sp_port_ets_fini(mlxsw_sp_port); |
Ido Schimmel | f00817d | 2016-04-06 17:10:09 +0200 | [diff] [blame] | 364 | } |