amd/xgbe/xgbe-dcb.c

0001 /*
0002  * AMD 10Gb Ethernet driver
0003  *
0004  * This file is available to you under your choice of the following two
0005  * licenses:
0006  *
0007  * License 1: GPLv2
0008  *
0009  * Copyright (c) 2014-2016 Advanced Micro Devices, Inc.
0010  *
0011  * This file is free software; you may copy, redistribute and/or modify
0012  * it under the terms of the GNU General Public License as published by
0013  * the Free Software Foundation, either version 2 of the License, or (at
0014  * your option) any later version.
0015  *
0016  * This file is distributed in the hope that it will be useful, but
0017  * WITHOUT ANY WARRANTY; without even the implied warranty of
0018  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
0019  * General Public License for more details.
0020  *
0021  * You should have received a copy of the GNU General Public License
0022  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
0023  *
0024  * This file incorporates work covered by the following copyright and
0025  * permission notice:
0026  *     The Synopsys DWC ETHER XGMAC Software Driver and documentation
0027  *     (hereinafter "Software") is an unsupported proprietary work of Synopsys,
0028  *     Inc. unless otherwise expressly agreed to in writing between Synopsys
0029  *     and you.
0030  *
0031  *     The Software IS NOT an item of Licensed Software or Licensed Product
0032  *     under any End User Software License Agreement or Agreement for Licensed
0033  *     Product with Synopsys or any supplement thereto.  Permission is hereby
0034  *     granted, free of charge, to any person obtaining a copy of this software
0035  *     annotated with this license and the Software, to deal in the Software
0036  *     without restriction, including without limitation the rights to use,
0037  *     copy, modify, merge, publish, distribute, sublicense, and/or sell copies
0038  *     of the Software, and to permit persons to whom the Software is furnished
0039  *     to do so, subject to the following conditions:
0040  *
0041  *     The above copyright notice and this permission notice shall be included
0042  *     in all copies or substantial portions of the Software.
0043  *
0044  *     THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS"
0045  *     BASIS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
0046  *     TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
0047  *     PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS
0048  *     BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0049  *     CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0050  *     SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0051  *     INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0052  *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0053  *     ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
0054  *     THE POSSIBILITY OF SUCH DAMAGE.
0055  *
0056  *
0057  * License 2: Modified BSD
0058  *
0059  * Copyright (c) 2014-2016 Advanced Micro Devices, Inc.
0060  * All rights reserved.
0061  *
0062  * Redistribution and use in source and binary forms, with or without
0063  * modification, are permitted provided that the following conditions are met:
0064  *     * Redistributions of source code must retain the above copyright
0065  *       notice, this list of conditions and the following disclaimer.
0066  *     * Redistributions in binary form must reproduce the above copyright
0067  *       notice, this list of conditions and the following disclaimer in the
0068  *       documentation and/or other materials provided with the distribution.
0069  *     * Neither the name of Advanced Micro Devices, Inc. nor the
0070  *       names of its contributors may be used to endorse or promote products
0071  *       derived from this software without specific prior written permission.
0072  *
0073  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0074  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0075  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0076  * ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
0077  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
0078  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
0079  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
0080  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
0081  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
0082  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
0083  *
0084  * This file incorporates work covered by the following copyright and
0085  * permission notice:
0086  *     The Synopsys DWC ETHER XGMAC Software Driver and documentation
0087  *     (hereinafter "Software") is an unsupported proprietary work of Synopsys,
0088  *     Inc. unless otherwise expressly agreed to in writing between Synopsys
0089  *     and you.
0090  *
0091  *     The Software IS NOT an item of Licensed Software or Licensed Product
0092  *     under any End User Software License Agreement or Agreement for Licensed
0093  *     Product with Synopsys or any supplement thereto.  Permission is hereby
0094  *     granted, free of charge, to any person obtaining a copy of this software
0095  *     annotated with this license and the Software, to deal in the Software
0096  *     without restriction, including without limitation the rights to use,
0097  *     copy, modify, merge, publish, distribute, sublicense, and/or sell copies
0098  *     of the Software, and to permit persons to whom the Software is furnished
0099  *     to do so, subject to the following conditions:
0100  *
0101  *     The above copyright notice and this permission notice shall be included
0102  *     in all copies or substantial portions of the Software.
0103  *
0104  *     THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS"
0105  *     BASIS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
0106  *     TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
0107  *     PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS
0108  *     BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0109  *     CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0110  *     SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0111  *     INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0112  *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0113  *     ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
0114  *     THE POSSIBILITY OF SUCH DAMAGE.
0115  */
0116
0117 #include <linux/netdevice.h>
0118 #include <net/dcbnl.h>
0119
0120 #include "xgbe.h"
0121 #include "xgbe-common.h"
0122
0123 static int xgbe_dcb_ieee_getets(struct net_device *netdev,
0124                 struct ieee_ets *ets)
0125 {
0126     struct xgbe_prv_data *pdata = netdev_priv(netdev);
0127
0128     /* Set number of supported traffic classes */
0129     ets->ets_cap = pdata->hw_feat.tc_cnt;
0130
0131     if (pdata->ets) {
0132         ets->cbs = pdata->ets->cbs;
0133         memcpy(ets->tc_tx_bw, pdata->ets->tc_tx_bw,
0134                sizeof(ets->tc_tx_bw));
0135         memcpy(ets->tc_tsa, pdata->ets->tc_tsa,
0136                sizeof(ets->tc_tsa));
0137         memcpy(ets->prio_tc, pdata->ets->prio_tc,
0138                sizeof(ets->prio_tc));
0139     }
0140
0141     return 0;
0142 }
0143
0144 static int xgbe_dcb_ieee_setets(struct net_device *netdev,
0145                 struct ieee_ets *ets)
0146 {
0147     struct xgbe_prv_data *pdata = netdev_priv(netdev);
0148     unsigned int i, tc_ets, tc_ets_weight;
0149     u8 max_tc = 0;
0150
0151     tc_ets = 0;
0152     tc_ets_weight = 0;
0153     for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
0154         netif_dbg(pdata, drv, netdev,
0155               "TC%u: tx_bw=%hhu, rx_bw=%hhu, tsa=%hhu\n", i,
0156               ets->tc_tx_bw[i], ets->tc_rx_bw[i],
0157               ets->tc_tsa[i]);
0158         netif_dbg(pdata, drv, netdev, "PRIO%u: TC=%hhu\n", i,
0159               ets->prio_tc[i]);
0160
0161         max_tc = max_t(u8, max_tc, ets->prio_tc[i]);
0162         if ((ets->tc_tx_bw[i] || ets->tc_tsa[i]))
0163             max_tc = max_t(u8, max_tc, i);
0164
0165         switch (ets->tc_tsa[i]) {
0166         case IEEE_8021QAZ_TSA_STRICT:
0167             break;
0168         case IEEE_8021QAZ_TSA_ETS:
0169             tc_ets = 1;
0170             tc_ets_weight += ets->tc_tx_bw[i];
0171             break;
0172         default:
0173             netif_err(pdata, drv, netdev,
0174                   "unsupported TSA algorithm (%hhu)\n",
0175                   ets->tc_tsa[i]);
0176             return -EINVAL;
0177         }
0178     }
0179
0180     /* Check maximum traffic class requested */
0181     if (max_tc >= pdata->hw_feat.tc_cnt) {
0182         netif_err(pdata, drv, netdev,
0183               "exceeded number of supported traffic classes\n");
0184         return -EINVAL;
0185     }
0186
0187     /* Weights must add up to 100% */
0188     if (tc_ets && (tc_ets_weight != 100)) {
0189         netif_err(pdata, drv, netdev,
0190               "sum of ETS algorithm weights is not 100 (%u)\n",
0191               tc_ets_weight);
0192         return -EINVAL;
0193     }
0194
0195     if (!pdata->ets) {
0196         pdata->ets = devm_kzalloc(pdata->dev, sizeof(*pdata->ets),
0197                       GFP_KERNEL);
0198         if (!pdata->ets)
0199             return -ENOMEM;
0200     }
0201
0202     pdata->num_tcs = max_tc + 1;
0203     memcpy(pdata->ets, ets, sizeof(*pdata->ets));
0204
0205     pdata->hw_if.config_dcb_tc(pdata);
0206
0207     return 0;
0208 }
0209
0210 static int xgbe_dcb_ieee_getpfc(struct net_device *netdev,
0211                 struct ieee_pfc *pfc)
0212 {
0213     struct xgbe_prv_data *pdata = netdev_priv(netdev);
0214
0215     /* Set number of supported PFC traffic classes */
0216     pfc->pfc_cap = pdata->hw_feat.tc_cnt;
0217
0218     if (pdata->pfc) {
0219         pfc->pfc_en = pdata->pfc->pfc_en;
0220         pfc->mbc = pdata->pfc->mbc;
0221         pfc->delay = pdata->pfc->delay;
0222     }
0223
0224     return 0;
0225 }
0226
0227 static int xgbe_dcb_ieee_setpfc(struct net_device *netdev,
0228                 struct ieee_pfc *pfc)
0229 {
0230     struct xgbe_prv_data *pdata = netdev_priv(netdev);
0231
0232     netif_dbg(pdata, drv, netdev,
0233           "cap=%d, en=%#x, mbc=%d, delay=%d\n",
0234           pfc->pfc_cap, pfc->pfc_en, pfc->mbc, pfc->delay);
0235
0236     /* Check PFC for supported number of traffic classes */
0237     if (pfc->pfc_en & ~((1 << pdata->hw_feat.tc_cnt) - 1)) {
0238         netif_err(pdata, drv, netdev,
0239               "PFC requested for unsupported traffic class\n");
0240         return -EINVAL;
0241     }
0242
0243     if (!pdata->pfc) {
0244         pdata->pfc = devm_kzalloc(pdata->dev, sizeof(*pdata->pfc),
0245                       GFP_KERNEL);
0246         if (!pdata->pfc)
0247             return -ENOMEM;
0248     }
0249
0250     memcpy(pdata->pfc, pfc, sizeof(*pdata->pfc));
0251
0252     pdata->hw_if.config_dcb_pfc(pdata);
0253
0254     return 0;
0255 }
0256
0257 static u8 xgbe_dcb_getdcbx(struct net_device *netdev)
0258 {
0259     return DCB_CAP_DCBX_HOST | DCB_CAP_DCBX_VER_IEEE;
0260 }
0261
0262 static u8 xgbe_dcb_setdcbx(struct net_device *netdev, u8 dcbx)
0263 {
0264     struct xgbe_prv_data *pdata = netdev_priv(netdev);
0265     u8 support = xgbe_dcb_getdcbx(netdev);
0266
0267     netif_dbg(pdata, drv, netdev, "DCBX=%#hhx\n", dcbx);
0268
0269     if (dcbx & ~support)
0270         return 1;
0271
0272     if ((dcbx & support) != support)
0273         return 1;
0274
0275     return 0;
0276 }
0277
0278 static const struct dcbnl_rtnl_ops xgbe_dcbnl_ops = {
0279     /* IEEE 802.1Qaz std */
0280     .ieee_getets = xgbe_dcb_ieee_getets,
0281     .ieee_setets = xgbe_dcb_ieee_setets,
0282     .ieee_getpfc = xgbe_dcb_ieee_getpfc,
0283     .ieee_setpfc = xgbe_dcb_ieee_setpfc,
0284
0285     /* DCBX configuration */
0286     .getdcbx     = xgbe_dcb_getdcbx,
0287     .setdcbx     = xgbe_dcb_setdcbx,
0288 };
0289
0290 const struct dcbnl_rtnl_ops *xgbe_get_dcbnl_ops(void)
0291 {
0292     return &xgbe_dcbnl_ops;
0293 }