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=%d, en=%#x, mbc=%d, delay=%d\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 }
294