drivers/net/ethernet/amd/xgbe/xgbe-dcb.c

   1 /*
   2  * AMD 10Gb Ethernet driver
   3  *
   4  * This file is available to you under your choice of the following two
   5  * licenses:
   6  *
   7  * License 1: GPLv2
   8  *
   9  * Copyright (c) 2014-2016 Advanced Micro Devices, Inc.
  10  *
  11  * This file is free software; you may copy, redistribute and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation, either version 2 of the License, or (at
  14  * your option) any later version.
  15  *
  16  * This file is distributed in the hope that it will be useful, but
  17  * WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19  * General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23  *
  24  * This file incorporates work covered by the following copyright and
  25  * permission notice:
  26  *     The Synopsys DWC ETHER XGMAC Software Driver and documentation
  27  *     (hereinafter "Software") is an unsupported proprietary work of Synopsys,
  28  *     Inc. unless otherwise expressly agreed to in writing between Synopsys
  29  *     and you.
  30  *
  31  *     The Software IS NOT an item of Licensed Software or Licensed Product
  32  *     under any End User Software License Agreement or Agreement for Licensed
  33  *     Product with Synopsys or any supplement thereto.  Permission is hereby
  34  *     granted, free of charge, to any person obtaining a copy of this software
  35  *     annotated with this license and the Software, to deal in the Software
  36  *     without restriction, including without limitation the rights to use,
  37  *     copy, modify, merge, publish, distribute, sublicense, and/or sell copies
  38  *     of the Software, and to permit persons to whom the Software is furnished
  39  *     to do so, subject to the following conditions:
  40  *
  41  *     The above copyright notice and this permission notice shall be included
  42  *     in all copies or substantial portions of the Software.
  43  *
  44  *     THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS"
  45  *     BASIS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  46  *     TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  47  *     PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS
  48  *     BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  49  *     CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  50  *     SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  51  *     INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  52  *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  53  *     ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  54  *     THE POSSIBILITY OF SUCH DAMAGE.
  55  *
  56  *
  57  * License 2: Modified BSD
  58  *
  59  * Copyright (c) 2014-2016 Advanced Micro Devices, Inc.
  60  * All rights reserved.
  61  *
  62  * Redistribution and use in source and binary forms, with or without
  63  * modification, are permitted provided that the following conditions are met:
  64  *     * Redistributions of source code must retain the above copyright
  65  *       notice, this list of conditions and the following disclaimer.
  66  *     * Redistributions in binary form must reproduce the above copyright
  67  *       notice, this list of conditions and the following disclaimer in the
  68  *       documentation and/or other materials provided with the distribution.
  69  *     * Neither the name of Advanced Micro Devices, Inc. nor the
  70  *       names of its contributors may be used to endorse or promote products
  71  *       derived from this software without specific prior written permission.
  72  *
  73  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  74  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  75  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  76  * ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
  77  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  78  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  79  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  80  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  81  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  82  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  83  *
  84  * This file incorporates work covered by the following copyright and
  85  * permission notice:
  86  *     The Synopsys DWC ETHER XGMAC Software Driver and documentation
  87  *     (hereinafter "Software") is an unsupported proprietary work of Synopsys,
  88  *     Inc. unless otherwise expressly agreed to in writing between Synopsys
  89  *     and you.
  90  *
  91  *     The Software IS NOT an item of Licensed Software or Licensed Product
  92  *     under any End User Software License Agreement or Agreement for Licensed
  93  *     Product with Synopsys or any supplement thereto.  Permission is hereby
  94  *     granted, free of charge, to any person obtaining a copy of this software
  95  *     annotated with this license and the Software, to deal in the Software
  96  *     without restriction, including without limitation the rights to use,
  97  *     copy, modify, merge, publish, distribute, sublicense, and/or sell copies
  98  *     of the Software, and to permit persons to whom the Software is furnished
  99  *     to do so, subject to the following conditions:
 100  *
 101  *     The above copyright notice and this permission notice shall be included
 102  *     in all copies or substantial portions of the Software.
 103  *
 104  *     THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS"
 105  *     BASIS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 106  *     TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 107  *     PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS
 108  *     BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 109  *     CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 110  *     SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 111  *     INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 112  *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 113  *     ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 114  *     THE POSSIBILITY OF SUCH DAMAGE.
 115  */
 116
 117 #include <linux/netdevice.h>
 118 #include <net/dcbnl.h>
 119
 120 #include "xgbe.h"
 121 #include "xgbe-common.h"
 122
 123 static int xgbe_dcb_ieee_getets(struct net_device *netdev,
 124                                 struct ieee_ets *ets)
 125 {
 126         struct xgbe_prv_data *pdata = netdev_priv(netdev);
 127
 128         /* Set number of supported traffic classes */
 129         ets->ets_cap = pdata->hw_feat.tc_cnt;
 130
 131         if (pdata->ets) {
 132                 ets->cbs = pdata->ets->cbs;
 133                 memcpy(ets->tc_tx_bw, pdata->ets->tc_tx_bw,
 134                        sizeof(ets->tc_tx_bw));
 135                 memcpy(ets->tc_tsa, pdata->ets->tc_tsa,
 136                        sizeof(ets->tc_tsa));
 137                 memcpy(ets->prio_tc, pdata->ets->prio_tc,
 138                        sizeof(ets->prio_tc));
 139         }
 140
 141         return 0;
 142 }
 143
 144 static int xgbe_dcb_ieee_setets(struct net_device *netdev,
 145                                 struct ieee_ets *ets)
 146 {
 147         struct xgbe_prv_data *pdata = netdev_priv(netdev);
 148         unsigned int i, tc_ets, tc_ets_weight;
 149         u8 max_tc = 0;
 150
 151         tc_ets = 0;
 152         tc_ets_weight = 0;
 153         for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
 154                 netif_dbg(pdata, drv, netdev,
 155                           "TC%u: tx_bw=%hhu, rx_bw=%hhu, tsa=%hhu\n", i,
 156                           ets->tc_tx_bw[i], ets->tc_rx_bw[i],
 157                           ets->tc_tsa[i]);
 158                 netif_dbg(pdata, drv, netdev, "PRIO%u: TC=%hhu\n", i,
 159                           ets->prio_tc[i]);
 160
 161                 max_tc = max_t(u8, max_tc, ets->prio_tc[i]);
 162                 if ((ets->tc_tx_bw[i] || ets->tc_tsa[i]))
 163                         max_tc = max_t(u8, max_tc, i);
 164
 165                 switch (ets->tc_tsa[i]) {
 166                 case IEEE_8021QAZ_TSA_STRICT:
 167                         break;
 168                 case IEEE_8021QAZ_TSA_ETS:
 169                         tc_ets = 1;
 170                         tc_ets_weight += ets->tc_tx_bw[i];
 171                         break;
 172                 default:
 173                         netif_err(pdata, drv, netdev,
 174                                   "unsupported TSA algorithm (%hhu)\n",
 175                                   ets->tc_tsa[i]);
 176                         return -EINVAL;
 177                 }
 178         }
 179
 180         /* Check maximum traffic class requested */
 181         if (max_tc >= pdata->hw_feat.tc_cnt) {
 182                 netif_err(pdata, drv, netdev,
 183                           "exceeded number of supported traffic classes\n");
 184                 return -EINVAL;
 185         }
 186
 187         /* Weights must add up to 100% */
 188         if (tc_ets && (tc_ets_weight != 100)) {
 189                 netif_err(pdata, drv, netdev,
 190                           "sum of ETS algorithm weights is not 100 (%u)\n",
 191                           tc_ets_weight);
 192                 return -EINVAL;
 193         }
 194
 195         if (!pdata->ets) {
 196                 pdata->ets = devm_kzalloc(pdata->dev, sizeof(*pdata->ets),
 197                                           GFP_KERNEL);
 198                 if (!pdata->ets)
 199                         return -ENOMEM;
 200         }
 201
 202         pdata->num_tcs = max_tc + 1;
 203         memcpy(pdata->ets, ets, sizeof(*pdata->ets));
 204
 205         pdata->hw_if.config_dcb_tc(pdata);
 206
 207         return 0;
 208 }
 209
 210 static int xgbe_dcb_ieee_getpfc(struct net_device *netdev,
 211                                 struct ieee_pfc *pfc)
 212 {
 213         struct xgbe_prv_data *pdata = netdev_priv(netdev);
 214
 215         /* Set number of supported PFC traffic classes */
 216         pfc->pfc_cap = pdata->hw_feat.tc_cnt;
 217
 218         if (pdata->pfc) {
 219                 pfc->pfc_en = pdata->pfc->pfc_en;
 220                 pfc->mbc = pdata->pfc->mbc;
 221                 pfc->delay = pdata->pfc->delay;
 222         }
 223
 224         return 0;
 225 }
 226
 227 static int xgbe_dcb_ieee_setpfc(struct net_device *netdev,
 228                                 struct ieee_pfc *pfc)
 229 {
 230         struct xgbe_prv_data *pdata = netdev_priv(netdev);
 231
 232         netif_dbg(pdata, drv, netdev,
 233                   "cap=%hhu, en=%#hhx, mbc=%hhu, delay=%hhu\n",
 234                   pfc->pfc_cap, pfc->pfc_en, pfc->mbc, pfc->delay);
 235
 236         /* Check PFC for supported number of traffic classes */
 237         if (pfc->pfc_en & ~((1 << pdata->hw_feat.tc_cnt) - 1)) {
 238                 netif_err(pdata, drv, netdev,
 239                           "PFC requested for unsupported traffic class\n");
 240                 return -EINVAL;
 241         }
 242
 243         if (!pdata->pfc) {
 244                 pdata->pfc = devm_kzalloc(pdata->dev, sizeof(*pdata->pfc),
 245                                           GFP_KERNEL);
 246                 if (!pdata->pfc)
 247                         return -ENOMEM;
 248         }
 249
 250         memcpy(pdata->pfc, pfc, sizeof(*pdata->pfc));
 251
 252         pdata->hw_if.config_dcb_pfc(pdata);
 253
 254         return 0;
 255 }
 256
 257 static u8 xgbe_dcb_getdcbx(struct net_device *netdev)
 258 {
 259         return DCB_CAP_DCBX_HOST | DCB_CAP_DCBX_VER_IEEE;
 260 }
 261
 262 static u8 xgbe_dcb_setdcbx(struct net_device *netdev, u8 dcbx)
 263 {
 264         struct xgbe_prv_data *pdata = netdev_priv(netdev);
 265         u8 support = xgbe_dcb_getdcbx(netdev);
 266
 267         netif_dbg(pdata, drv, netdev, "DCBX=%#hhx\n", dcbx);
 268
 269         if (dcbx & ~support)
 270                 return 1;
 271
 272         if ((dcbx & support) != support)
 273                 return 1;
 274
 275         return 0;
 276 }
 277
 278 static const struct dcbnl_rtnl_ops xgbe_dcbnl_ops = {
 279         /* IEEE 802.1Qaz std */
 280         .ieee_getets = xgbe_dcb_ieee_getets,
 281         .ieee_setets = xgbe_dcb_ieee_setets,
 282         .ieee_getpfc = xgbe_dcb_ieee_getpfc,
 283         .ieee_setpfc = xgbe_dcb_ieee_setpfc,
 284
 285         /* DCBX configuration */
 286         .getdcbx     = xgbe_dcb_getdcbx,
 287         .setdcbx     = xgbe_dcb_setdcbx,
 288 };
 289
 290 const struct dcbnl_rtnl_ops *xgbe_get_dcbnl_ops(void)
 291 {
 292         return &xgbe_dcbnl_ops;
 293 }