drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_82599.c

   1 /*******************************************************************************
   2
   3   Intel 10 Gigabit PCI Express Linux driver
   4   Copyright(c) 1999 - 2012 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   e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  24   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  25
  26 *******************************************************************************/
  27
  28 #include "ixgbe.h"
  29 #include "ixgbe_type.h"
  30 #include "ixgbe_dcb.h"
  31 #include "ixgbe_dcb_82599.h"
  32
  33 /**
  34  * ixgbe_dcb_config_rx_arbiter_82599 - Config Rx Data arbiter
  35  * @hw: pointer to hardware structure
  36  * @refill: refill credits index by traffic class
  37  * @max: max credits index by traffic class
  38  * @bwg_id: bandwidth grouping indexed by traffic class
  39  * @prio_type: priority type indexed by traffic class
  40  *
  41  * Configure Rx Packet Arbiter and credits for each traffic class.
  42  */
  43 s32 ixgbe_dcb_config_rx_arbiter_82599(struct ixgbe_hw *hw,
  44                                       u16 *refill,
  45                                       u16 *max,
  46                                       u8 *bwg_id,
  47                                       u8 *prio_type,
  48                                       u8 *prio_tc)
  49 {
  50         u32    reg           = 0;
  51         u32    credit_refill = 0;
  52         u32    credit_max    = 0;
  53         u8     i             = 0;
  54
  55         /*
  56          * Disable the arbiter before changing parameters
  57          * (always enable recycle mode; WSP)
  58          */
  59         reg = IXGBE_RTRPCS_RRM | IXGBE_RTRPCS_RAC | IXGBE_RTRPCS_ARBDIS;
  60         IXGBE_WRITE_REG(hw, IXGBE_RTRPCS, reg);
  61
  62         /* Map all traffic classes to their UP */
  63         reg = 0;
  64         for (i = 0; i < MAX_USER_PRIORITY; i++)
  65                 reg |= (prio_tc[i] << (i * IXGBE_RTRUP2TC_UP_SHIFT));
  66         IXGBE_WRITE_REG(hw, IXGBE_RTRUP2TC, reg);
  67
  68         /* Configure traffic class credits and priority */
  69         for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
  70                 credit_refill = refill[i];
  71                 credit_max    = max[i];
  72                 reg = credit_refill | (credit_max << IXGBE_RTRPT4C_MCL_SHIFT);
  73
  74                 reg |= (u32)(bwg_id[i]) << IXGBE_RTRPT4C_BWG_SHIFT;
  75
  76                 if (prio_type[i] == prio_link)
  77                         reg |= IXGBE_RTRPT4C_LSP;
  78
  79                 IXGBE_WRITE_REG(hw, IXGBE_RTRPT4C(i), reg);
  80         }
  81
  82         /*
  83          * Configure Rx packet plane (recycle mode; WSP) and
  84          * enable arbiter
  85          */
  86         reg = IXGBE_RTRPCS_RRM | IXGBE_RTRPCS_RAC;
  87         IXGBE_WRITE_REG(hw, IXGBE_RTRPCS, reg);
  88
  89         return 0;
  90 }
  91
  92 /**
  93  * ixgbe_dcb_config_tx_desc_arbiter_82599 - Config Tx Desc. arbiter
  94  * @hw: pointer to hardware structure
  95  * @refill: refill credits index by traffic class
  96  * @max: max credits index by traffic class
  97  * @bwg_id: bandwidth grouping indexed by traffic class
  98  * @prio_type: priority type indexed by traffic class
  99  *
 100  * Configure Tx Descriptor Arbiter and credits for each traffic class.
 101  */
 102 s32 ixgbe_dcb_config_tx_desc_arbiter_82599(struct ixgbe_hw *hw,
 103                                            u16 *refill,
 104                                            u16 *max,
 105                                            u8 *bwg_id,
 106                                            u8 *prio_type)
 107 {
 108         u32    reg, max_credits;
 109         u8     i;
 110
 111         /* Clear the per-Tx queue credits; we use per-TC instead */
 112         for (i = 0; i < 128; i++) {
 113                 IXGBE_WRITE_REG(hw, IXGBE_RTTDQSEL, i);
 114                 IXGBE_WRITE_REG(hw, IXGBE_RTTDT1C, 0);
 115         }
 116
 117         /* Configure traffic class credits and priority */
 118         for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
 119                 max_credits = max[i];
 120                 reg = max_credits << IXGBE_RTTDT2C_MCL_SHIFT;
 121                 reg |= refill[i];
 122                 reg |= (u32)(bwg_id[i]) << IXGBE_RTTDT2C_BWG_SHIFT;
 123
 124                 if (prio_type[i] == prio_group)
 125                         reg |= IXGBE_RTTDT2C_GSP;
 126
 127                 if (prio_type[i] == prio_link)
 128                         reg |= IXGBE_RTTDT2C_LSP;
 129
 130                 IXGBE_WRITE_REG(hw, IXGBE_RTTDT2C(i), reg);
 131         }
 132
 133         /*
 134          * Configure Tx descriptor plane (recycle mode; WSP) and
 135          * enable arbiter
 136          */
 137         reg = IXGBE_RTTDCS_TDPAC | IXGBE_RTTDCS_TDRM;
 138         IXGBE_WRITE_REG(hw, IXGBE_RTTDCS, reg);
 139
 140         return 0;
 141 }
 142
 143 /**
 144  * ixgbe_dcb_config_tx_data_arbiter_82599 - Config Tx Data arbiter
 145  * @hw: pointer to hardware structure
 146  * @refill: refill credits index by traffic class
 147  * @max: max credits index by traffic class
 148  * @bwg_id: bandwidth grouping indexed by traffic class
 149  * @prio_type: priority type indexed by traffic class
 150  *
 151  * Configure Tx Packet Arbiter and credits for each traffic class.
 152  */
 153 s32 ixgbe_dcb_config_tx_data_arbiter_82599(struct ixgbe_hw *hw,
 154                                            u16 *refill,
 155                                            u16 *max,
 156                                            u8 *bwg_id,
 157                                            u8 *prio_type,
 158                                            u8 *prio_tc)
 159 {
 160         u32 reg;
 161         u8 i;
 162
 163         /*
 164          * Disable the arbiter before changing parameters
 165          * (always enable recycle mode; SP; arb delay)
 166          */
 167         reg = IXGBE_RTTPCS_TPPAC | IXGBE_RTTPCS_TPRM |
 168               (IXGBE_RTTPCS_ARBD_DCB << IXGBE_RTTPCS_ARBD_SHIFT) |
 169               IXGBE_RTTPCS_ARBDIS;
 170         IXGBE_WRITE_REG(hw, IXGBE_RTTPCS, reg);
 171
 172         /* Map all traffic classes to their UP */
 173         reg = 0;
 174         for (i = 0; i < MAX_USER_PRIORITY; i++)
 175                 reg |= (prio_tc[i] << (i * IXGBE_RTTUP2TC_UP_SHIFT));
 176         IXGBE_WRITE_REG(hw, IXGBE_RTTUP2TC, reg);
 177
 178         /* Configure traffic class credits and priority */
 179         for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
 180                 reg = refill[i];
 181                 reg |= (u32)(max[i]) << IXGBE_RTTPT2C_MCL_SHIFT;
 182                 reg |= (u32)(bwg_id[i]) << IXGBE_RTTPT2C_BWG_SHIFT;
 183
 184                 if (prio_type[i] == prio_group)
 185                         reg |= IXGBE_RTTPT2C_GSP;
 186
 187                 if (prio_type[i] == prio_link)
 188                         reg |= IXGBE_RTTPT2C_LSP;
 189
 190                 IXGBE_WRITE_REG(hw, IXGBE_RTTPT2C(i), reg);
 191         }
 192
 193         /*
 194          * Configure Tx packet plane (recycle mode; SP; arb delay) and
 195          * enable arbiter
 196          */
 197         reg = IXGBE_RTTPCS_TPPAC | IXGBE_RTTPCS_TPRM |
 198               (IXGBE_RTTPCS_ARBD_DCB << IXGBE_RTTPCS_ARBD_SHIFT);
 199         IXGBE_WRITE_REG(hw, IXGBE_RTTPCS, reg);
 200
 201         return 0;
 202 }
 203
 204 /**
 205  * ixgbe_dcb_config_pfc_82599 - Configure priority flow control
 206  * @hw: pointer to hardware structure
 207  * @pfc_en: enabled pfc bitmask
 208  * @prio_tc: priority to tc assignments indexed by priority
 209  *
 210  * Configure Priority Flow Control (PFC) for each traffic class.
 211  */
 212 s32 ixgbe_dcb_config_pfc_82599(struct ixgbe_hw *hw, u8 pfc_en, u8 *prio_tc)
 213 {
 214         u32 i, j, reg;
 215         u8 max_tc = 0;
 216
 217         for (i = 0; i < MAX_USER_PRIORITY; i++)
 218                 if (prio_tc[i] > max_tc)
 219                         max_tc = prio_tc[i];
 220
 221         /* Configure PFC Tx thresholds per TC */
 222         for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
 223                 int enabled = 0;
 224
 225                 if (i > max_tc) {
 226                         reg = 0;
 227                         IXGBE_WRITE_REG(hw, IXGBE_FCRTL_82599(i), reg);
 228                         IXGBE_WRITE_REG(hw, IXGBE_FCRTH_82599(i), reg);
 229                         continue;
 230                 }
 231
 232                 for (j = 0; j < MAX_USER_PRIORITY; j++) {
 233                         if ((prio_tc[j] == i) && (pfc_en & (1 << j))) {
 234                                 enabled = 1;
 235                                 break;
 236                         }
 237                 }
 238
 239                 reg = hw->fc.low_water << 10;
 240
 241                 if (enabled)
 242                         reg |= IXGBE_FCRTL_XONE;
 243                 IXGBE_WRITE_REG(hw, IXGBE_FCRTL_82599(i), reg);
 244
 245                 reg = hw->fc.high_water[i] << 10;
 246                 if (enabled)
 247                         reg |= IXGBE_FCRTH_FCEN;
 248                 IXGBE_WRITE_REG(hw, IXGBE_FCRTH_82599(i), reg);
 249         }
 250
 251         if (pfc_en) {
 252                 /* Configure pause time (2 TCs per register) */
 253                 reg = hw->fc.pause_time | (hw->fc.pause_time << 16);
 254                 for (i = 0; i < (MAX_TRAFFIC_CLASS / 2); i++)
 255                         IXGBE_WRITE_REG(hw, IXGBE_FCTTV(i), reg);
 256
 257                 /* Configure flow control refresh threshold value */
 258                 IXGBE_WRITE_REG(hw, IXGBE_FCRTV, hw->fc.pause_time / 2);
 259
 260
 261                 reg = IXGBE_FCCFG_TFCE_PRIORITY;
 262                 IXGBE_WRITE_REG(hw, IXGBE_FCCFG, reg);
 263                 /*
 264                  * Enable Receive PFC
 265                  * 82599 will always honor XOFF frames we receive when
 266                  * we are in PFC mode however X540 only honors enabled
 267                  * traffic classes.
 268                  */
 269                 reg = IXGBE_READ_REG(hw, IXGBE_MFLCN);
 270                 reg &= ~IXGBE_MFLCN_RFCE;
 271                 reg |= IXGBE_MFLCN_RPFCE | IXGBE_MFLCN_DPF;
 272
 273                 if (hw->mac.type == ixgbe_mac_X540) {
 274                         reg &= ~IXGBE_MFLCN_RPFCE_MASK;
 275                         reg |= pfc_en << IXGBE_MFLCN_RPFCE_SHIFT;
 276                 }
 277
 278                 IXGBE_WRITE_REG(hw, IXGBE_MFLCN, reg);
 279
 280         } else {
 281                 /* X540 devices have a RX bit that should be cleared
 282                  * if PFC is disabled on all TCs but PFC features is
 283                  * enabled.
 284                  */
 285                 if (hw->mac.type == ixgbe_mac_X540) {
 286                         reg = IXGBE_READ_REG(hw, IXGBE_MFLCN);
 287                         reg &= ~IXGBE_MFLCN_RPFCE_MASK;
 288                         IXGBE_WRITE_REG(hw, IXGBE_MFLCN, reg);
 289                 }
 290
 291                 for (i = 0; i < MAX_TRAFFIC_CLASS; i++)
 292                         hw->mac.ops.fc_enable(hw, i);
 293         }
 294
 295         return 0;
 296 }
 297
 298 /**
 299  * ixgbe_dcb_config_tc_stats_82599 - Config traffic class statistics
 300  * @hw: pointer to hardware structure
 301  *
 302  * Configure queue statistics registers, all queues belonging to same traffic
 303  * class uses a single set of queue statistics counters.
 304  */
 305 static s32 ixgbe_dcb_config_tc_stats_82599(struct ixgbe_hw *hw)
 306 {
 307         u32 reg = 0;
 308         u8  i   = 0;
 309
 310         /*
 311          * Receive Queues stats setting
 312          * 32 RQSMR registers, each configuring 4 queues.
 313          * Set all 16 queues of each TC to the same stat
 314          * with TC 'n' going to stat 'n'.
 315          */
 316         for (i = 0; i < 32; i++) {
 317                 reg = 0x01010101 * (i / 4);
 318                 IXGBE_WRITE_REG(hw, IXGBE_RQSMR(i), reg);
 319         }
 320         /*
 321          * Transmit Queues stats setting
 322          * 32 TQSM registers, each controlling 4 queues.
 323          * Set all queues of each TC to the same stat
 324          * with TC 'n' going to stat 'n'.
 325          * Tx queues are allocated non-uniformly to TCs:
 326          * 32, 32, 16, 16, 8, 8, 8, 8.
 327          */
 328         for (i = 0; i < 32; i++) {
 329                 if (i < 8)
 330                         reg = 0x00000000;
 331                 else if (i < 16)
 332                         reg = 0x01010101;
 333                 else if (i < 20)
 334                         reg = 0x02020202;
 335                 else if (i < 24)
 336                         reg = 0x03030303;
 337                 else if (i < 26)
 338                         reg = 0x04040404;
 339                 else if (i < 28)
 340                         reg = 0x05050505;
 341                 else if (i < 30)
 342                         reg = 0x06060606;
 343                 else
 344                         reg = 0x07070707;
 345                 IXGBE_WRITE_REG(hw, IXGBE_TQSM(i), reg);
 346         }
 347
 348         return 0;
 349 }
 350
 351 /**
 352  * ixgbe_dcb_hw_config_82599 - Configure and enable DCB
 353  * @hw: pointer to hardware structure
 354  * @refill: refill credits index by traffic class
 355  * @max: max credits index by traffic class
 356  * @bwg_id: bandwidth grouping indexed by traffic class
 357  * @prio_type: priority type indexed by traffic class
 358  * @pfc_en: enabled pfc bitmask
 359  *
 360  * Configure dcb settings and enable dcb mode.
 361  */
 362 s32 ixgbe_dcb_hw_config_82599(struct ixgbe_hw *hw, u8 pfc_en, u16 *refill,
 363                               u16 *max, u8 *bwg_id, u8 *prio_type, u8 *prio_tc)
 364 {
 365         ixgbe_dcb_config_rx_arbiter_82599(hw, refill, max, bwg_id,
 366                                           prio_type, prio_tc);
 367         ixgbe_dcb_config_tx_desc_arbiter_82599(hw, refill, max,
 368                                                bwg_id, prio_type);
 369         ixgbe_dcb_config_tx_data_arbiter_82599(hw, refill, max,
 370                                                bwg_id, prio_type, prio_tc);
 371         ixgbe_dcb_config_pfc_82599(hw, pfc_en, prio_tc);
 372         ixgbe_dcb_config_tc_stats_82599(hw);
 373
 374         return 0;
 375 }
 376