1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright(c) 1999 - 2018 Intel Corporation. */ 3 4 #include "ixgbe.h" 5 #include "ixgbe_type.h" 6 #include "ixgbe_dcb.h" 7 #include "ixgbe_dcb_82598.h" 8 #include "ixgbe_dcb_82599.h" 9 10 /** 11 * ixgbe_ieee_credits - This calculates the ieee traffic class 12 * credits from the configured bandwidth percentages. Credits 13 * are the smallest unit programmable into the underlying 14 * hardware. The IEEE 802.1Qaz specification do not use bandwidth 15 * groups so this is much simplified from the CEE case. 16 * @bw: bandwidth index by traffic class 17 * @refill: refill credits index by traffic class 18 * @max: max credits by traffic class 19 * @max_frame: maximum frame size 20 */ 21 static int ixgbe_ieee_credits(__u8 *bw, __u16 *refill, 22 __u16 *max, int max_frame) 23 { 24 int min_percent = 100; 25 int min_credit, multiplier; 26 int i; 27 28 min_credit = ((max_frame / 2) + DCB_CREDIT_QUANTUM - 1) / 29 DCB_CREDIT_QUANTUM; 30 31 for (i = 0; i < MAX_TRAFFIC_CLASS; i++) { 32 if (bw[i] < min_percent && bw[i]) 33 min_percent = bw[i]; 34 } 35 36 multiplier = (min_credit / min_percent) + 1; 37 38 /* Find out the hw credits for each TC */ 39 for (i = 0; i < MAX_TRAFFIC_CLASS; i++) { 40 int val = min(bw[i] * multiplier, MAX_CREDIT_REFILL); 41 42 if (val < min_credit) 43 val = min_credit; 44 refill[i] = val; 45 46 max[i] = bw[i] ? (bw[i] * MAX_CREDIT)/100 : min_credit; 47 } 48 return 0; 49 } 50 51 /** 52 * ixgbe_dcb_calculate_tc_credits - Calculates traffic class credits 53 * @hw: pointer to hardware structure 54 * @dcb_config: Struct containing DCB settings 55 * @max_frame: Maximum frame size 56 * @direction: Configuring either Tx or Rx 57 * 58 * This function calculates the credits allocated to each traffic class. 59 * It should be called only after the rules are checked by 60 * ixgbe_dcb_check_config(). 61 */ 62 int ixgbe_dcb_calculate_tc_credits(struct ixgbe_hw *hw, 63 struct ixgbe_dcb_config *dcb_config, 64 int max_frame, u8 direction) 65 { 66 struct tc_bw_alloc *p; 67 int min_credit; 68 int min_multiplier; 69 int min_percent = 100; 70 /* Initialization values default for Tx settings */ 71 u32 credit_refill = 0; 72 u32 credit_max = 0; 73 u16 link_percentage = 0; 74 u8 bw_percent = 0; 75 u8 i; 76 77 if (!dcb_config) 78 return DCB_ERR_CONFIG; 79 80 min_credit = ((max_frame / 2) + DCB_CREDIT_QUANTUM - 1) / 81 DCB_CREDIT_QUANTUM; 82 83 /* Find smallest link percentage */ 84 for (i = 0; i < MAX_TRAFFIC_CLASS; i++) { 85 p = &dcb_config->tc_config[i].path[direction]; 86 bw_percent = dcb_config->bw_percentage[direction][p->bwg_id]; 87 link_percentage = p->bwg_percent; 88 89 link_percentage = (link_percentage * bw_percent) / 100; 90 91 if (link_percentage && link_percentage < min_percent) 92 min_percent = link_percentage; 93 } 94 95 /* 96 * The ratio between traffic classes will control the bandwidth 97 * percentages seen on the wire. To calculate this ratio we use 98 * a multiplier. It is required that the refill credits must be 99 * larger than the max frame size so here we find the smallest 100 * multiplier that will allow all bandwidth percentages to be 101 * greater than the max frame size. 102 */ 103 min_multiplier = (min_credit / min_percent) + 1; 104 105 /* Find out the link percentage for each TC first */ 106 for (i = 0; i < MAX_TRAFFIC_CLASS; i++) { 107 p = &dcb_config->tc_config[i].path[direction]; 108 bw_percent = dcb_config->bw_percentage[direction][p->bwg_id]; 109 110 link_percentage = p->bwg_percent; 111 /* Must be careful of integer division for very small nums */ 112 link_percentage = (link_percentage * bw_percent) / 100; 113 if (p->bwg_percent > 0 && link_percentage == 0) 114 link_percentage = 1; 115 116 /* Save link_percentage for reference */ 117 p->link_percent = (u8)link_percentage; 118 119 /* Calculate credit refill ratio using multiplier */ 120 credit_refill = min(link_percentage * min_multiplier, 121 MAX_CREDIT_REFILL); 122 123 /* Refill at least minimum credit */ 124 if (credit_refill < min_credit) 125 credit_refill = min_credit; 126 127 p->data_credits_refill = (u16)credit_refill; 128 129 /* Calculate maximum credit for the TC */ 130 credit_max = (link_percentage * MAX_CREDIT) / 100; 131 132 /* 133 * Adjustment based on rule checking, if the percentage 134 * of a TC is too small, the maximum credit may not be 135 * enough to send out a jumbo frame in data plane arbitration. 136 */ 137 if (credit_max < min_credit) 138 credit_max = min_credit; 139 140 if (direction == DCB_TX_CONFIG) { 141 /* 142 * Adjustment based on rule checking, if the 143 * percentage of a TC is too small, the maximum 144 * credit may not be enough to send out a TSO 145 * packet in descriptor plane arbitration. 146 */ 147 if ((hw->mac.type == ixgbe_mac_82598EB) && 148 credit_max && 149 (credit_max < MINIMUM_CREDIT_FOR_TSO)) 150 credit_max = MINIMUM_CREDIT_FOR_TSO; 151 152 dcb_config->tc_config[i].desc_credits_max = 153 (u16)credit_max; 154 } 155 156 p->data_credits_max = (u16)credit_max; 157 } 158 159 return 0; 160 } 161 162 void ixgbe_dcb_unpack_pfc(struct ixgbe_dcb_config *cfg, u8 *pfc_en) 163 { 164 struct tc_configuration *tc_config = &cfg->tc_config[0]; 165 int tc; 166 167 for (*pfc_en = 0, tc = 0; tc < MAX_TRAFFIC_CLASS; tc++) { 168 if (tc_config[tc].dcb_pfc != pfc_disabled) 169 *pfc_en |= BIT(tc); 170 } 171 } 172 173 void ixgbe_dcb_unpack_refill(struct ixgbe_dcb_config *cfg, int direction, 174 u16 *refill) 175 { 176 struct tc_configuration *tc_config = &cfg->tc_config[0]; 177 int tc; 178 179 for (tc = 0; tc < MAX_TRAFFIC_CLASS; tc++) 180 refill[tc] = tc_config[tc].path[direction].data_credits_refill; 181 } 182 183 void ixgbe_dcb_unpack_max(struct ixgbe_dcb_config *cfg, u16 *max) 184 { 185 struct tc_configuration *tc_config = &cfg->tc_config[0]; 186 int tc; 187 188 for (tc = 0; tc < MAX_TRAFFIC_CLASS; tc++) 189 max[tc] = tc_config[tc].desc_credits_max; 190 } 191 192 void ixgbe_dcb_unpack_bwgid(struct ixgbe_dcb_config *cfg, int direction, 193 u8 *bwgid) 194 { 195 struct tc_configuration *tc_config = &cfg->tc_config[0]; 196 int tc; 197 198 for (tc = 0; tc < MAX_TRAFFIC_CLASS; tc++) 199 bwgid[tc] = tc_config[tc].path[direction].bwg_id; 200 } 201 202 void ixgbe_dcb_unpack_prio(struct ixgbe_dcb_config *cfg, int direction, 203 u8 *ptype) 204 { 205 struct tc_configuration *tc_config = &cfg->tc_config[0]; 206 int tc; 207 208 for (tc = 0; tc < MAX_TRAFFIC_CLASS; tc++) 209 ptype[tc] = tc_config[tc].path[direction].prio_type; 210 } 211 212 u8 ixgbe_dcb_get_tc_from_up(struct ixgbe_dcb_config *cfg, int direction, u8 up) 213 { 214 struct tc_configuration *tc_config = &cfg->tc_config[0]; 215 u8 prio_mask = BIT(up); 216 u8 tc = cfg->num_tcs.pg_tcs; 217 218 /* If tc is 0 then DCB is likely not enabled or supported */ 219 if (!tc) 220 return 0; 221 222 /* 223 * Test from maximum TC to 1 and report the first match we find. If 224 * we find no match we can assume that the TC is 0 since the TC must 225 * be set for all user priorities 226 */ 227 for (tc--; tc; tc--) { 228 if (prio_mask & tc_config[tc].path[direction].up_to_tc_bitmap) 229 break; 230 } 231 232 return tc; 233 } 234 235 void ixgbe_dcb_unpack_map(struct ixgbe_dcb_config *cfg, int direction, u8 *map) 236 { 237 u8 up; 238 239 for (up = 0; up < MAX_USER_PRIORITY; up++) 240 map[up] = ixgbe_dcb_get_tc_from_up(cfg, direction, up); 241 } 242 243 /** 244 * ixgbe_dcb_hw_config - Config and enable DCB 245 * @hw: pointer to hardware structure 246 * @dcb_config: pointer to ixgbe_dcb_config structure 247 * 248 * Configure dcb settings and enable dcb mode. 249 */ 250 int ixgbe_dcb_hw_config(struct ixgbe_hw *hw, 251 struct ixgbe_dcb_config *dcb_config) 252 { 253 u8 pfc_en; 254 u8 ptype[MAX_TRAFFIC_CLASS]; 255 u8 bwgid[MAX_TRAFFIC_CLASS]; 256 u8 prio_tc[MAX_TRAFFIC_CLASS]; 257 u16 refill[MAX_TRAFFIC_CLASS]; 258 u16 max[MAX_TRAFFIC_CLASS]; 259 260 /* Unpack CEE standard containers */ 261 ixgbe_dcb_unpack_pfc(dcb_config, &pfc_en); 262 ixgbe_dcb_unpack_refill(dcb_config, DCB_TX_CONFIG, refill); 263 ixgbe_dcb_unpack_max(dcb_config, max); 264 ixgbe_dcb_unpack_bwgid(dcb_config, DCB_TX_CONFIG, bwgid); 265 ixgbe_dcb_unpack_prio(dcb_config, DCB_TX_CONFIG, ptype); 266 ixgbe_dcb_unpack_map(dcb_config, DCB_TX_CONFIG, prio_tc); 267 268 switch (hw->mac.type) { 269 case ixgbe_mac_82598EB: 270 return ixgbe_dcb_hw_config_82598(hw, pfc_en, refill, max, 271 bwgid, ptype); 272 case ixgbe_mac_82599EB: 273 case ixgbe_mac_X540: 274 case ixgbe_mac_X550: 275 case ixgbe_mac_X550EM_x: 276 case ixgbe_mac_x550em_a: 277 return ixgbe_dcb_hw_config_82599(hw, pfc_en, refill, max, 278 bwgid, ptype, prio_tc); 279 default: 280 break; 281 } 282 return 0; 283 } 284 285 /* Helper routines to abstract HW specifics from DCB netlink ops */ 286 int ixgbe_dcb_hw_pfc_config(struct ixgbe_hw *hw, u8 pfc_en, u8 *prio_tc) 287 { 288 switch (hw->mac.type) { 289 case ixgbe_mac_82598EB: 290 return ixgbe_dcb_config_pfc_82598(hw, pfc_en); 291 case ixgbe_mac_82599EB: 292 case ixgbe_mac_X540: 293 case ixgbe_mac_X550: 294 case ixgbe_mac_X550EM_x: 295 case ixgbe_mac_x550em_a: 296 return ixgbe_dcb_config_pfc_82599(hw, pfc_en, prio_tc); 297 default: 298 break; 299 } 300 return -EINVAL; 301 } 302 303 int ixgbe_dcb_hw_ets(struct ixgbe_hw *hw, struct ieee_ets *ets, int max_frame) 304 { 305 __u16 refill[IEEE_8021QAZ_MAX_TCS], max[IEEE_8021QAZ_MAX_TCS]; 306 __u8 prio_type[IEEE_8021QAZ_MAX_TCS]; 307 int i; 308 309 /* naively give each TC a bwg to map onto CEE hardware */ 310 __u8 bwg_id[IEEE_8021QAZ_MAX_TCS] = {0, 1, 2, 3, 4, 5, 6, 7}; 311 312 /* Map TSA onto CEE prio type */ 313 for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) { 314 switch (ets->tc_tsa[i]) { 315 case IEEE_8021QAZ_TSA_STRICT: 316 prio_type[i] = 2; 317 break; 318 case IEEE_8021QAZ_TSA_ETS: 319 prio_type[i] = 0; 320 break; 321 default: 322 /* Hardware only supports priority strict or 323 * ETS transmission selection algorithms if 324 * we receive some other value from dcbnl 325 * throw an error 326 */ 327 return -EINVAL; 328 } 329 } 330 331 ixgbe_ieee_credits(ets->tc_tx_bw, refill, max, max_frame); 332 return ixgbe_dcb_hw_ets_config(hw, refill, max, 333 bwg_id, prio_type, ets->prio_tc); 334 } 335 336 int ixgbe_dcb_hw_ets_config(struct ixgbe_hw *hw, 337 u16 *refill, u16 *max, u8 *bwg_id, 338 u8 *prio_type, u8 *prio_tc) 339 { 340 switch (hw->mac.type) { 341 case ixgbe_mac_82598EB: 342 ixgbe_dcb_config_rx_arbiter_82598(hw, refill, max, 343 prio_type); 344 ixgbe_dcb_config_tx_desc_arbiter_82598(hw, refill, max, 345 bwg_id, prio_type); 346 ixgbe_dcb_config_tx_data_arbiter_82598(hw, refill, max, 347 bwg_id, prio_type); 348 break; 349 case ixgbe_mac_82599EB: 350 case ixgbe_mac_X540: 351 case ixgbe_mac_X550: 352 case ixgbe_mac_X550EM_x: 353 case ixgbe_mac_x550em_a: 354 ixgbe_dcb_config_rx_arbiter_82599(hw, refill, max, 355 bwg_id, prio_type, prio_tc); 356 ixgbe_dcb_config_tx_desc_arbiter_82599(hw, refill, max, 357 bwg_id, prio_type); 358 ixgbe_dcb_config_tx_data_arbiter_82599(hw, refill, max, bwg_id, 359 prio_type, prio_tc); 360 break; 361 default: 362 break; 363 } 364 return 0; 365 } 366 367 static void ixgbe_dcb_read_rtrup2tc_82599(struct ixgbe_hw *hw, u8 *map) 368 { 369 u32 reg, i; 370 371 reg = IXGBE_READ_REG(hw, IXGBE_RTRUP2TC); 372 for (i = 0; i < MAX_USER_PRIORITY; i++) 373 map[i] = IXGBE_RTRUP2TC_UP_MASK & 374 (reg >> (i * IXGBE_RTRUP2TC_UP_SHIFT)); 375 } 376 377 void ixgbe_dcb_read_rtrup2tc(struct ixgbe_hw *hw, u8 *map) 378 { 379 switch (hw->mac.type) { 380 case ixgbe_mac_82599EB: 381 case ixgbe_mac_X540: 382 case ixgbe_mac_X550: 383 case ixgbe_mac_X550EM_x: 384 case ixgbe_mac_x550em_a: 385 ixgbe_dcb_read_rtrup2tc_82599(hw, map); 386 break; 387 default: 388 break; 389 } 390 } 391