linux/drivers/net/ethernet/amd/xgbe/xgbe-dcb.c
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   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 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 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
 123static 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
 144static 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
 150        tc_ets = 0;
 151        tc_ets_weight = 0;
 152        for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
 153                DBGPR("  TC%u: tx_bw=%hhu, rx_bw=%hhu, tsa=%hhu\n", i,
 154                      ets->tc_tx_bw[i], ets->tc_rx_bw[i], ets->tc_tsa[i]);
 155                DBGPR("  PRIO%u: TC=%hhu\n", i, ets->prio_tc[i]);
 156
 157                if ((ets->tc_tx_bw[i] || ets->tc_tsa[i]) &&
 158                    (i >= pdata->hw_feat.tc_cnt))
 159                                return -EINVAL;
 160
 161                if (ets->prio_tc[i] >= pdata->hw_feat.tc_cnt)
 162                        return -EINVAL;
 163
 164                switch (ets->tc_tsa[i]) {
 165                case IEEE_8021QAZ_TSA_STRICT:
 166                        break;
 167                case IEEE_8021QAZ_TSA_ETS:
 168                        tc_ets = 1;
 169                        tc_ets_weight += ets->tc_tx_bw[i];
 170                        break;
 171
 172                default:
 173                        return -EINVAL;
 174                }
 175        }
 176
 177        /* Weights must add up to 100% */
 178        if (tc_ets && (tc_ets_weight != 100))
 179                return -EINVAL;
 180
 181        if (!pdata->ets) {
 182                pdata->ets = devm_kzalloc(pdata->dev, sizeof(*pdata->ets),
 183                                          GFP_KERNEL);
 184                if (!pdata->ets)
 185                        return -ENOMEM;
 186        }
 187
 188        memcpy(pdata->ets, ets, sizeof(*pdata->ets));
 189
 190        pdata->hw_if.config_dcb_tc(pdata);
 191
 192        return 0;
 193}
 194
 195static int xgbe_dcb_ieee_getpfc(struct net_device *netdev,
 196                                struct ieee_pfc *pfc)
 197{
 198        struct xgbe_prv_data *pdata = netdev_priv(netdev);
 199
 200        /* Set number of supported PFC traffic classes */
 201        pfc->pfc_cap = pdata->hw_feat.tc_cnt;
 202
 203        if (pdata->pfc) {
 204                pfc->pfc_en = pdata->pfc->pfc_en;
 205                pfc->mbc = pdata->pfc->mbc;
 206                pfc->delay = pdata->pfc->delay;
 207        }
 208
 209        return 0;
 210}
 211
 212static int xgbe_dcb_ieee_setpfc(struct net_device *netdev,
 213                                struct ieee_pfc *pfc)
 214{
 215        struct xgbe_prv_data *pdata = netdev_priv(netdev);
 216
 217        DBGPR("  cap=%hhu, en=%hhx, mbc=%hhu, delay=%hhu\n",
 218              pfc->pfc_cap, pfc->pfc_en, pfc->mbc, pfc->delay);
 219
 220        if (!pdata->pfc) {
 221                pdata->pfc = devm_kzalloc(pdata->dev, sizeof(*pdata->pfc),
 222                                          GFP_KERNEL);
 223                if (!pdata->pfc)
 224                        return -ENOMEM;
 225        }
 226
 227        memcpy(pdata->pfc, pfc, sizeof(*pdata->pfc));
 228
 229        pdata->hw_if.config_dcb_pfc(pdata);
 230
 231        return 0;
 232}
 233
 234static u8 xgbe_dcb_getdcbx(struct net_device *netdev)
 235{
 236        return DCB_CAP_DCBX_HOST | DCB_CAP_DCBX_VER_IEEE;
 237}
 238
 239static u8 xgbe_dcb_setdcbx(struct net_device *netdev, u8 dcbx)
 240{
 241        u8 support = xgbe_dcb_getdcbx(netdev);
 242
 243        DBGPR("  DCBX=%#hhx\n", dcbx);
 244
 245        if (dcbx & ~support)
 246                return 1;
 247
 248        if ((dcbx & support) != support)
 249                return 1;
 250
 251        return 0;
 252}
 253
 254static const struct dcbnl_rtnl_ops xgbe_dcbnl_ops = {
 255        /* IEEE 802.1Qaz std */
 256        .ieee_getets = xgbe_dcb_ieee_getets,
 257        .ieee_setets = xgbe_dcb_ieee_setets,
 258        .ieee_getpfc = xgbe_dcb_ieee_getpfc,
 259        .ieee_setpfc = xgbe_dcb_ieee_setpfc,
 260
 261        /* DCBX configuration */
 262        .getdcbx     = xgbe_dcb_getdcbx,
 263        .setdcbx     = xgbe_dcb_setdcbx,
 264};
 265
 266const struct dcbnl_rtnl_ops *xgbe_get_dcbnl_ops(void)
 267{
 268        return &xgbe_dcbnl_ops;
 269}
 270