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en_dcb_nl.c
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1 /*
2  * Copyright (c) 2011 Mellanox Technologies. All rights reserved.
3  *
4  * This software is available to you under a choice of one of two
5  * licenses. You may choose to be licensed under the terms of the GNU
6  * General Public License (GPL) Version 2, available from the file
7  * COPYING in the main directory of this source tree, or the
8  * OpenIB.org BSD license below:
9  *
10  * Redistribution and use in source and binary forms, with or
11  * without modification, are permitted provided that the following
12  * conditions are met:
13  *
14  * - Redistributions of source code must retain the above
15  * copyright notice, this list of conditions and the following
16  * disclaimer.
17  *
18  * - Redistributions in binary form must reproduce the above
19  * copyright notice, this list of conditions and the following
20  * disclaimer in the documentation and/or other materials
21  * provided with the distribution.
22  *
23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30  * SOFTWARE.
31  *
32  */
33 
34 #include <linux/dcbnl.h>
35 #include <linux/math64.h>
36 
37 #include "mlx4_en.h"
38 
39 static int mlx4_en_dcbnl_ieee_getets(struct net_device *dev,
40  struct ieee_ets *ets)
41 {
42  struct mlx4_en_priv *priv = netdev_priv(dev);
43  struct ieee_ets *my_ets = &priv->ets;
44 
45  /* No IEEE PFC settings available */
46  if (!my_ets)
47  return -EINVAL;
48 
50  ets->cbs = my_ets->cbs;
51  memcpy(ets->tc_tx_bw, my_ets->tc_tx_bw, sizeof(ets->tc_tx_bw));
52  memcpy(ets->tc_tsa, my_ets->tc_tsa, sizeof(ets->tc_tsa));
53  memcpy(ets->prio_tc, my_ets->prio_tc, sizeof(ets->prio_tc));
54 
55  return 0;
56 }
57 
58 static int mlx4_en_ets_validate(struct mlx4_en_priv *priv, struct ieee_ets *ets)
59 {
60  int i;
61  int total_ets_bw = 0;
62  int has_ets_tc = 0;
63 
64  for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
65  if (ets->prio_tc[i] > MLX4_EN_NUM_UP) {
66  en_err(priv, "Bad priority in UP <=> TC mapping. TC: %d, UP: %d\n",
67  i, ets->prio_tc[i]);
68  return -EINVAL;
69  }
70 
71  switch (ets->tc_tsa[i]) {
73  break;
75  has_ets_tc = 1;
76  total_ets_bw += ets->tc_tx_bw[i];
77  break;
78  default:
79  en_err(priv, "TC[%d]: Not supported TSA: %d\n",
80  i, ets->tc_tsa[i]);
81  return -ENOTSUPP;
82  }
83  }
84 
85  if (has_ets_tc && total_ets_bw != MLX4_EN_BW_MAX) {
86  en_err(priv, "Bad ETS BW sum: %d. Should be exactly 100%%\n",
87  total_ets_bw);
88  return -EINVAL;
89  }
90 
91  return 0;
92 }
93 
94 static int mlx4_en_config_port_scheduler(struct mlx4_en_priv *priv,
95  struct ieee_ets *ets, u16 *ratelimit)
96 {
97  struct mlx4_en_dev *mdev = priv->mdev;
98  int num_strict = 0;
99  int i;
100  __u8 tc_tx_bw[IEEE_8021QAZ_MAX_TCS] = { 0 };
101  __u8 pg[IEEE_8021QAZ_MAX_TCS] = { 0 };
102 
103  ets = ets ?: &priv->ets;
104  ratelimit = ratelimit ?: priv->maxrate;
105 
106  /* higher TC means higher priority => lower pg */
107  for (i = IEEE_8021QAZ_MAX_TCS - 1; i >= 0; i--) {
108  switch (ets->tc_tsa[i]) {
110  pg[i] = num_strict++;
111  tc_tx_bw[i] = MLX4_EN_BW_MAX;
112  break;
114  pg[i] = MLX4_EN_TC_ETS;
115  tc_tx_bw[i] = ets->tc_tx_bw[i] ?: MLX4_EN_BW_MIN;
116  break;
117  }
118  }
119 
120  return mlx4_SET_PORT_SCHEDULER(mdev->dev, priv->port, tc_tx_bw, pg,
121  ratelimit);
122 }
123 
124 static int
125 mlx4_en_dcbnl_ieee_setets(struct net_device *dev, struct ieee_ets *ets)
126 {
127  struct mlx4_en_priv *priv = netdev_priv(dev);
128  struct mlx4_en_dev *mdev = priv->mdev;
129  int err;
130 
131  err = mlx4_en_ets_validate(priv, ets);
132  if (err)
133  return err;
134 
135  err = mlx4_SET_PORT_PRIO2TC(mdev->dev, priv->port, ets->prio_tc);
136  if (err)
137  return err;
138 
139  err = mlx4_en_config_port_scheduler(priv, ets, NULL);
140  if (err)
141  return err;
142 
143  memcpy(&priv->ets, ets, sizeof(priv->ets));
144 
145  return 0;
146 }
147 
148 static int mlx4_en_dcbnl_ieee_getpfc(struct net_device *dev,
149  struct ieee_pfc *pfc)
150 {
151  struct mlx4_en_priv *priv = netdev_priv(dev);
152 
154  pfc->pfc_en = priv->prof->tx_ppp;
155 
156  return 0;
157 }
158 
159 static int mlx4_en_dcbnl_ieee_setpfc(struct net_device *dev,
160  struct ieee_pfc *pfc)
161 {
162  struct mlx4_en_priv *priv = netdev_priv(dev);
163  struct mlx4_en_dev *mdev = priv->mdev;
164  int err;
165 
166  en_dbg(DRV, priv, "cap: 0x%x en: 0x%x mbc: 0x%x delay: %d\n",
167  pfc->pfc_cap,
168  pfc->pfc_en,
169  pfc->mbc,
170  pfc->delay);
171 
172  priv->prof->rx_pause = priv->prof->tx_pause = !!pfc->pfc_en;
173  priv->prof->rx_ppp = priv->prof->tx_ppp = pfc->pfc_en;
174 
175  err = mlx4_SET_PORT_general(mdev->dev, priv->port,
176  priv->rx_skb_size + ETH_FCS_LEN,
177  priv->prof->tx_pause,
178  priv->prof->tx_ppp,
179  priv->prof->rx_pause,
180  priv->prof->rx_ppp);
181  if (err)
182  en_err(priv, "Failed setting pause params\n");
183 
184  return err;
185 }
186 
187 static u8 mlx4_en_dcbnl_getdcbx(struct net_device *dev)
188 {
189  return DCB_CAP_DCBX_VER_IEEE;
190 }
191 
192 static u8 mlx4_en_dcbnl_setdcbx(struct net_device *dev, u8 mode)
193 {
194  if ((mode & DCB_CAP_DCBX_LLD_MANAGED) ||
195  (mode & DCB_CAP_DCBX_VER_CEE) ||
196  !(mode & DCB_CAP_DCBX_VER_IEEE) ||
197  !(mode & DCB_CAP_DCBX_HOST))
198  return 1;
199 
200  return 0;
201 }
202 
203 #define MLX4_RATELIMIT_UNITS_IN_KB 100000 /* rate-limit HW unit in Kbps */
204 static int mlx4_en_dcbnl_ieee_getmaxrate(struct net_device *dev,
205  struct ieee_maxrate *maxrate)
206 {
207  struct mlx4_en_priv *priv = netdev_priv(dev);
208  int i;
209 
210  if (!priv->maxrate)
211  return -EINVAL;
212 
213  for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++)
214  maxrate->tc_maxrate[i] =
215  priv->maxrate[i] * MLX4_RATELIMIT_UNITS_IN_KB;
216 
217  return 0;
218 }
219 
220 static int mlx4_en_dcbnl_ieee_setmaxrate(struct net_device *dev,
221  struct ieee_maxrate *maxrate)
222 {
223  struct mlx4_en_priv *priv = netdev_priv(dev);
225  int i, err;
226 
227  for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
228  /* Convert from Kbps into HW units, rounding result up.
229  * Setting to 0, means unlimited BW.
230  */
231  tmp[i] = div_u64(maxrate->tc_maxrate[i] +
234  }
235 
236  err = mlx4_en_config_port_scheduler(priv, NULL, tmp);
237  if (err)
238  return err;
239 
240  memcpy(priv->maxrate, tmp, sizeof(priv->maxrate));
241 
242  return 0;
243 }
244 
246  .ieee_getets = mlx4_en_dcbnl_ieee_getets,
247  .ieee_setets = mlx4_en_dcbnl_ieee_setets,
248  .ieee_getmaxrate = mlx4_en_dcbnl_ieee_getmaxrate,
249  .ieee_setmaxrate = mlx4_en_dcbnl_ieee_setmaxrate,
250  .ieee_getpfc = mlx4_en_dcbnl_ieee_getpfc,
251  .ieee_setpfc = mlx4_en_dcbnl_ieee_setpfc,
252 
253  .getdcbx = mlx4_en_dcbnl_getdcbx,
254  .setdcbx = mlx4_en_dcbnl_setdcbx,
255 };