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 39static 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 49 ets->ets_cap = IEEE_8021QAZ_MAX_TCS; 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 58static 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]) { 72 case IEEE_8021QAZ_TSA_STRICT: 73 break; 74 case IEEE_8021QAZ_TSA_ETS: 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 94static 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]) { 109 case IEEE_8021QAZ_TSA_STRICT: 110 pg[i] = num_strict++; 111 tc_tx_bw[i] = MLX4_EN_BW_MAX; 112 break; 113 case IEEE_8021QAZ_TSA_ETS: 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 124static int 125mlx4_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 148static 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); 152 153 pfc->pfc_cap = IEEE_8021QAZ_MAX_TCS; 154 pfc->pfc_en = priv->prof->tx_ppp; 155 156 return 0; 157} 158 159static 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_port_profile *prof = priv->prof; 164 struct mlx4_en_dev *mdev = priv->mdev; 165 int err; 166 167 en_dbg(DRV, priv, "cap: 0x%x en: 0x%x mbc: 0x%x delay: %d\n", 168 pfc->pfc_cap, 169 pfc->pfc_en, 170 pfc->mbc, 171 pfc->delay); 172 173 prof->rx_pause = !pfc->pfc_en; 174 prof->tx_pause = !pfc->pfc_en; 175 prof->rx_ppp = pfc->pfc_en; 176 prof->tx_ppp = pfc->pfc_en; 177 178 err = mlx4_SET_PORT_general(mdev->dev, priv->port, 179 priv->rx_skb_size + ETH_FCS_LEN, 180 prof->tx_pause, 181 prof->tx_ppp, 182 prof->rx_pause, 183 prof->rx_ppp); 184 if (err) 185 en_err(priv, "Failed setting pause params\n"); 186 187 return err; 188} 189 190static u8 mlx4_en_dcbnl_getdcbx(struct net_device *dev) 191{ 192 return DCB_CAP_DCBX_HOST | DCB_CAP_DCBX_VER_IEEE; 193} 194 195static u8 mlx4_en_dcbnl_setdcbx(struct net_device *dev, u8 mode) 196{ 197 if ((mode & DCB_CAP_DCBX_LLD_MANAGED) || 198 (mode & DCB_CAP_DCBX_VER_CEE) || 199 !(mode & DCB_CAP_DCBX_VER_IEEE) || 200 !(mode & DCB_CAP_DCBX_HOST)) 201 return 1; 202 203 return 0; 204} 205 206#define MLX4_RATELIMIT_UNITS_IN_KB 100000 /* rate-limit HW unit in Kbps */ 207static int mlx4_en_dcbnl_ieee_getmaxrate(struct net_device *dev, 208 struct ieee_maxrate *maxrate) 209{ 210 struct mlx4_en_priv *priv = netdev_priv(dev); 211 int i; 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 220static 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); 224 u16 tmp[IEEE_8021QAZ_MAX_TCS]; 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] + 232 MLX4_RATELIMIT_UNITS_IN_KB - 1, 233 MLX4_RATELIMIT_UNITS_IN_KB); 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 245const struct dcbnl_rtnl_ops mlx4_en_dcbnl_ops = { 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}; 256 257const struct dcbnl_rtnl_ops mlx4_en_dcbnl_pfc_ops = { 258 .ieee_getpfc = mlx4_en_dcbnl_ieee_getpfc, 259 .ieee_setpfc = mlx4_en_dcbnl_ieee_setpfc, 260 261 .getdcbx = mlx4_en_dcbnl_getdcbx, 262 .setdcbx = mlx4_en_dcbnl_setdcbx, 263}; 264