1 /******************************************************************************* 2 3 Intel 10 Gigabit PCI Express Linux driver 4 Copyright(c) 1999 - 2013 Intel Corporation. 5 6 This program is free software; you can redistribute it and/or modify it 7 under the terms and conditions of the GNU General Public License, 8 version 2, as published by the Free Software Foundation. 9 10 This program is distributed in the hope it will be useful, but WITHOUT 11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13 more details. 14 15 You should have received a copy of the GNU General Public License along with 16 this program; if not, write to the Free Software Foundation, Inc., 17 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 18 19 The full GNU General Public License is included in this distribution in 20 the file called "COPYING". 21 22 Contact Information: 23 Linux NICS <linux.nics@intel.com> 24 e1000-devel Mailing List <e1000-devel@lists.sourceforge.net> 25 Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 26 27 *******************************************************************************/ 28 29 #include "ixgbe.h" 30 #include "ixgbe_type.h" 31 #include "ixgbe_dcb.h" 32 #include "ixgbe_dcb_82599.h" 33 34 /** 35 * ixgbe_dcb_config_rx_arbiter_82599 - Config Rx Data arbiter 36 * @hw: pointer to hardware structure 37 * @refill: refill credits index by traffic class 38 * @max: max credits index by traffic class 39 * @bwg_id: bandwidth grouping indexed by traffic class 40 * @prio_type: priority type indexed by traffic class 41 * 42 * Configure Rx Packet Arbiter and credits for each traffic class. 43 */ 44 s32 ixgbe_dcb_config_rx_arbiter_82599(struct ixgbe_hw *hw, 45 u16 *refill, 46 u16 *max, 47 u8 *bwg_id, 48 u8 *prio_type, 49 u8 *prio_tc) 50 { 51 u32 reg = 0; 52 u32 credit_refill = 0; 53 u32 credit_max = 0; 54 u8 i = 0; 55 56 /* 57 * Disable the arbiter before changing parameters 58 * (always enable recycle mode; WSP) 59 */ 60 reg = IXGBE_RTRPCS_RRM | IXGBE_RTRPCS_RAC | IXGBE_RTRPCS_ARBDIS; 61 IXGBE_WRITE_REG(hw, IXGBE_RTRPCS, reg); 62 63 /* Map all traffic classes to their UP */ 64 reg = 0; 65 for (i = 0; i < MAX_USER_PRIORITY; i++) 66 reg |= (prio_tc[i] << (i * IXGBE_RTRUP2TC_UP_SHIFT)); 67 IXGBE_WRITE_REG(hw, IXGBE_RTRUP2TC, reg); 68 69 /* Configure traffic class credits and priority */ 70 for (i = 0; i < MAX_TRAFFIC_CLASS; i++) { 71 credit_refill = refill[i]; 72 credit_max = max[i]; 73 reg = credit_refill | (credit_max << IXGBE_RTRPT4C_MCL_SHIFT); 74 75 reg |= (u32)(bwg_id[i]) << IXGBE_RTRPT4C_BWG_SHIFT; 76 77 if (prio_type[i] == prio_link) 78 reg |= IXGBE_RTRPT4C_LSP; 79 80 IXGBE_WRITE_REG(hw, IXGBE_RTRPT4C(i), reg); 81 } 82 83 /* 84 * Configure Rx packet plane (recycle mode; WSP) and 85 * enable arbiter 86 */ 87 reg = IXGBE_RTRPCS_RRM | IXGBE_RTRPCS_RAC; 88 IXGBE_WRITE_REG(hw, IXGBE_RTRPCS, reg); 89 90 return 0; 91 } 92 93 /** 94 * ixgbe_dcb_config_tx_desc_arbiter_82599 - Config Tx Desc. arbiter 95 * @hw: pointer to hardware structure 96 * @refill: refill credits index by traffic class 97 * @max: max credits index by traffic class 98 * @bwg_id: bandwidth grouping indexed by traffic class 99 * @prio_type: priority type indexed by traffic class 100 * 101 * Configure Tx Descriptor Arbiter and credits for each traffic class. 102 */ 103 s32 ixgbe_dcb_config_tx_desc_arbiter_82599(struct ixgbe_hw *hw, 104 u16 *refill, 105 u16 *max, 106 u8 *bwg_id, 107 u8 *prio_type) 108 { 109 u32 reg, max_credits; 110 u8 i; 111 112 /* Clear the per-Tx queue credits; we use per-TC instead */ 113 for (i = 0; i < 128; i++) { 114 IXGBE_WRITE_REG(hw, IXGBE_RTTDQSEL, i); 115 IXGBE_WRITE_REG(hw, IXGBE_RTTDT1C, 0); 116 } 117 118 /* Configure traffic class credits and priority */ 119 for (i = 0; i < MAX_TRAFFIC_CLASS; i++) { 120 max_credits = max[i]; 121 reg = max_credits << IXGBE_RTTDT2C_MCL_SHIFT; 122 reg |= refill[i]; 123 reg |= (u32)(bwg_id[i]) << IXGBE_RTTDT2C_BWG_SHIFT; 124 125 if (prio_type[i] == prio_group) 126 reg |= IXGBE_RTTDT2C_GSP; 127 128 if (prio_type[i] == prio_link) 129 reg |= IXGBE_RTTDT2C_LSP; 130 131 IXGBE_WRITE_REG(hw, IXGBE_RTTDT2C(i), reg); 132 } 133 134 /* 135 * Configure Tx descriptor plane (recycle mode; WSP) and 136 * enable arbiter 137 */ 138 reg = IXGBE_RTTDCS_TDPAC | IXGBE_RTTDCS_TDRM; 139 IXGBE_WRITE_REG(hw, IXGBE_RTTDCS, reg); 140 141 return 0; 142 } 143 144 /** 145 * ixgbe_dcb_config_tx_data_arbiter_82599 - Config Tx Data arbiter 146 * @hw: pointer to hardware structure 147 * @refill: refill credits index by traffic class 148 * @max: max credits index by traffic class 149 * @bwg_id: bandwidth grouping indexed by traffic class 150 * @prio_type: priority type indexed by traffic class 151 * 152 * Configure Tx Packet Arbiter and credits for each traffic class. 153 */ 154 s32 ixgbe_dcb_config_tx_data_arbiter_82599(struct ixgbe_hw *hw, 155 u16 *refill, 156 u16 *max, 157 u8 *bwg_id, 158 u8 *prio_type, 159 u8 *prio_tc) 160 { 161 u32 reg; 162 u8 i; 163 164 /* 165 * Disable the arbiter before changing parameters 166 * (always enable recycle mode; SP; arb delay) 167 */ 168 reg = IXGBE_RTTPCS_TPPAC | IXGBE_RTTPCS_TPRM | 169 (IXGBE_RTTPCS_ARBD_DCB << IXGBE_RTTPCS_ARBD_SHIFT) | 170 IXGBE_RTTPCS_ARBDIS; 171 IXGBE_WRITE_REG(hw, IXGBE_RTTPCS, reg); 172 173 /* Map all traffic classes to their UP */ 174 reg = 0; 175 for (i = 0; i < MAX_USER_PRIORITY; i++) 176 reg |= (prio_tc[i] << (i * IXGBE_RTTUP2TC_UP_SHIFT)); 177 IXGBE_WRITE_REG(hw, IXGBE_RTTUP2TC, reg); 178 179 /* Configure traffic class credits and priority */ 180 for (i = 0; i < MAX_TRAFFIC_CLASS; i++) { 181 reg = refill[i]; 182 reg |= (u32)(max[i]) << IXGBE_RTTPT2C_MCL_SHIFT; 183 reg |= (u32)(bwg_id[i]) << IXGBE_RTTPT2C_BWG_SHIFT; 184 185 if (prio_type[i] == prio_group) 186 reg |= IXGBE_RTTPT2C_GSP; 187 188 if (prio_type[i] == prio_link) 189 reg |= IXGBE_RTTPT2C_LSP; 190 191 IXGBE_WRITE_REG(hw, IXGBE_RTTPT2C(i), reg); 192 } 193 194 /* 195 * Configure Tx packet plane (recycle mode; SP; arb delay) and 196 * enable arbiter 197 */ 198 reg = IXGBE_RTTPCS_TPPAC | IXGBE_RTTPCS_TPRM | 199 (IXGBE_RTTPCS_ARBD_DCB << IXGBE_RTTPCS_ARBD_SHIFT); 200 IXGBE_WRITE_REG(hw, IXGBE_RTTPCS, reg); 201 202 return 0; 203 } 204 205 /** 206 * ixgbe_dcb_config_pfc_82599 - Configure priority flow control 207 * @hw: pointer to hardware structure 208 * @pfc_en: enabled pfc bitmask 209 * @prio_tc: priority to tc assignments indexed by priority 210 * 211 * Configure Priority Flow Control (PFC) for each traffic class. 212 */ 213 s32 ixgbe_dcb_config_pfc_82599(struct ixgbe_hw *hw, u8 pfc_en, u8 *prio_tc) 214 { 215 u32 i, j, fcrtl, reg; 216 u8 max_tc = 0; 217 218 /* Enable Transmit Priority Flow Control */ 219 IXGBE_WRITE_REG(hw, IXGBE_FCCFG, IXGBE_FCCFG_TFCE_PRIORITY); 220 221 /* Enable Receive Priority Flow Control */ 222 reg = IXGBE_READ_REG(hw, IXGBE_MFLCN); 223 reg |= IXGBE_MFLCN_DPF; 224 225 /* 226 * X540 & X550 supports per TC Rx priority flow control. 227 * So clear all TCs and only enable those that should be 228 * enabled. 229 */ 230 reg &= ~(IXGBE_MFLCN_RPFCE_MASK | IXGBE_MFLCN_RFCE); 231 232 if (hw->mac.type >= ixgbe_mac_X540) 233 reg |= pfc_en << IXGBE_MFLCN_RPFCE_SHIFT; 234 235 if (pfc_en) 236 reg |= IXGBE_MFLCN_RPFCE; 237 238 IXGBE_WRITE_REG(hw, IXGBE_MFLCN, reg); 239 240 for (i = 0; i < MAX_USER_PRIORITY; i++) { 241 if (prio_tc[i] > max_tc) 242 max_tc = prio_tc[i]; 243 } 244 245 246 /* Configure PFC Tx thresholds per TC */ 247 for (i = 0; i <= max_tc; i++) { 248 int enabled = 0; 249 250 for (j = 0; j < MAX_USER_PRIORITY; j++) { 251 if ((prio_tc[j] == i) && (pfc_en & BIT(j))) { 252 enabled = 1; 253 break; 254 } 255 } 256 257 if (enabled) { 258 reg = (hw->fc.high_water[i] << 10) | IXGBE_FCRTH_FCEN; 259 fcrtl = (hw->fc.low_water[i] << 10) | IXGBE_FCRTL_XONE; 260 IXGBE_WRITE_REG(hw, IXGBE_FCRTL_82599(i), fcrtl); 261 } else { 262 /* In order to prevent Tx hangs when the internal Tx 263 * switch is enabled we must set the high water mark 264 * to the Rx packet buffer size - 24KB. This allows 265 * the Tx switch to function even under heavy Rx 266 * workloads. 267 */ 268 reg = IXGBE_READ_REG(hw, IXGBE_RXPBSIZE(i)) - 24576; 269 IXGBE_WRITE_REG(hw, IXGBE_FCRTL_82599(i), 0); 270 } 271 272 IXGBE_WRITE_REG(hw, IXGBE_FCRTH_82599(i), reg); 273 } 274 275 for (; i < MAX_TRAFFIC_CLASS; i++) { 276 IXGBE_WRITE_REG(hw, IXGBE_FCRTL_82599(i), 0); 277 IXGBE_WRITE_REG(hw, IXGBE_FCRTH_82599(i), 0); 278 } 279 280 /* Configure pause time (2 TCs per register) */ 281 reg = hw->fc.pause_time * 0x00010001; 282 for (i = 0; i < (MAX_TRAFFIC_CLASS / 2); i++) 283 IXGBE_WRITE_REG(hw, IXGBE_FCTTV(i), reg); 284 285 /* Configure flow control refresh threshold value */ 286 IXGBE_WRITE_REG(hw, IXGBE_FCRTV, hw->fc.pause_time / 2); 287 288 return 0; 289 } 290 291 /** 292 * ixgbe_dcb_config_tc_stats_82599 - Config traffic class statistics 293 * @hw: pointer to hardware structure 294 * 295 * Configure queue statistics registers, all queues belonging to same traffic 296 * class uses a single set of queue statistics counters. 297 */ 298 static s32 ixgbe_dcb_config_tc_stats_82599(struct ixgbe_hw *hw) 299 { 300 u32 reg = 0; 301 u8 i = 0; 302 303 /* 304 * Receive Queues stats setting 305 * 32 RQSMR registers, each configuring 4 queues. 306 * Set all 16 queues of each TC to the same stat 307 * with TC 'n' going to stat 'n'. 308 */ 309 for (i = 0; i < 32; i++) { 310 reg = 0x01010101 * (i / 4); 311 IXGBE_WRITE_REG(hw, IXGBE_RQSMR(i), reg); 312 } 313 /* 314 * Transmit Queues stats setting 315 * 32 TQSM registers, each controlling 4 queues. 316 * Set all queues of each TC to the same stat 317 * with TC 'n' going to stat 'n'. 318 * Tx queues are allocated non-uniformly to TCs: 319 * 32, 32, 16, 16, 8, 8, 8, 8. 320 */ 321 for (i = 0; i < 32; i++) { 322 if (i < 8) 323 reg = 0x00000000; 324 else if (i < 16) 325 reg = 0x01010101; 326 else if (i < 20) 327 reg = 0x02020202; 328 else if (i < 24) 329 reg = 0x03030303; 330 else if (i < 26) 331 reg = 0x04040404; 332 else if (i < 28) 333 reg = 0x05050505; 334 else if (i < 30) 335 reg = 0x06060606; 336 else 337 reg = 0x07070707; 338 IXGBE_WRITE_REG(hw, IXGBE_TQSM(i), reg); 339 } 340 341 return 0; 342 } 343 344 /** 345 * ixgbe_dcb_hw_config_82599 - Configure and enable DCB 346 * @hw: pointer to hardware structure 347 * @refill: refill credits index by traffic class 348 * @max: max credits index by traffic class 349 * @bwg_id: bandwidth grouping indexed by traffic class 350 * @prio_type: priority type indexed by traffic class 351 * @pfc_en: enabled pfc bitmask 352 * 353 * Configure dcb settings and enable dcb mode. 354 */ 355 s32 ixgbe_dcb_hw_config_82599(struct ixgbe_hw *hw, u8 pfc_en, u16 *refill, 356 u16 *max, u8 *bwg_id, u8 *prio_type, u8 *prio_tc) 357 { 358 ixgbe_dcb_config_rx_arbiter_82599(hw, refill, max, bwg_id, 359 prio_type, prio_tc); 360 ixgbe_dcb_config_tx_desc_arbiter_82599(hw, refill, max, 361 bwg_id, prio_type); 362 ixgbe_dcb_config_tx_data_arbiter_82599(hw, refill, max, 363 bwg_id, prio_type, prio_tc); 364 ixgbe_dcb_config_pfc_82599(hw, pfc_en, prio_tc); 365 ixgbe_dcb_config_tc_stats_82599(hw); 366 367 return 0; 368 } 369 370