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

   1 /*******************************************************************************
   2
   3   Intel 10 Gigabit PCI Express Linux driver
   4   Copyright(c) 1999 - 2011 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, 1 to 1 */
  63         reg = 0;
  64         for (i = 0; i < MAX_TRAFFIC_CLASS; 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, 1 to 1 */
 173         reg = 0;
 174         for (i = 0; i < MAX_TRAFFIC_CLASS; 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  *
 209  * Configure Priority Flow Control (PFC) for each traffic class.
 210  */
 211 s32 ixgbe_dcb_config_pfc_82599(struct ixgbe_hw *hw, u8 pfc_en)
 212 {
 213         u32 i, reg, rx_pba_size;
 214
 215         /* Configure PFC Tx thresholds per TC */
 216         for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
 217                 int enabled = pfc_en & (1 << i);
 218                 rx_pba_size = IXGBE_READ_REG(hw, IXGBE_RXPBSIZE(i));
 219                 rx_pba_size >>= IXGBE_RXPBSIZE_SHIFT;
 220
 221                 reg = (rx_pba_size - hw->fc.low_water) << 10;
 222
 223                 if (enabled)
 224                         reg |= IXGBE_FCRTL_XONE;
 225                 IXGBE_WRITE_REG(hw, IXGBE_FCRTL_82599(i), reg);
 226
 227                 reg = (rx_pba_size - hw->fc.high_water) << 10;
 228                 if (enabled)
 229                         reg |= IXGBE_FCRTH_FCEN;
 230                 IXGBE_WRITE_REG(hw, IXGBE_FCRTH_82599(i), reg);
 231         }
 232
 233         if (pfc_en) {
 234                 /* Configure pause time (2 TCs per register) */
 235                 reg = hw->fc.pause_time | (hw->fc.pause_time << 16);
 236                 for (i = 0; i < (MAX_TRAFFIC_CLASS / 2); i++)
 237                         IXGBE_WRITE_REG(hw, IXGBE_FCTTV(i), reg);
 238
 239                 /* Configure flow control refresh threshold value */
 240                 IXGBE_WRITE_REG(hw, IXGBE_FCRTV, hw->fc.pause_time / 2);
 241
 242
 243                 reg = IXGBE_FCCFG_TFCE_PRIORITY;
 244                 IXGBE_WRITE_REG(hw, IXGBE_FCCFG, reg);
 245                 /*
 246                  * Enable Receive PFC
 247                  * 82599 will always honor XOFF frames we receive when
 248                  * we are in PFC mode however X540 only honors enabled
 249                  * traffic classes.
 250                  */
 251                 reg = IXGBE_READ_REG(hw, IXGBE_MFLCN);
 252                 reg &= ~IXGBE_MFLCN_RFCE;
 253                 reg |= IXGBE_MFLCN_RPFCE | IXGBE_MFLCN_DPF;
 254
 255                 if (hw->mac.type == ixgbe_mac_X540) {
 256                         reg &= ~IXGBE_MFLCN_RPFCE_MASK;
 257                         reg |= pfc_en << IXGBE_MFLCN_RPFCE_SHIFT;
 258                 }
 259
 260                 IXGBE_WRITE_REG(hw, IXGBE_MFLCN, reg);
 261
 262         } else {
 263                 for (i = 0; i < MAX_TRAFFIC_CLASS; i++)
 264                         hw->mac.ops.fc_enable(hw, i);
 265         }
 266
 267         return 0;
 268 }
 269
 270 /**
 271  * ixgbe_dcb_config_tc_stats_82599 - Config traffic class statistics
 272  * @hw: pointer to hardware structure
 273  *
 274  * Configure queue statistics registers, all queues belonging to same traffic
 275  * class uses a single set of queue statistics counters.
 276  */
 277 static s32 ixgbe_dcb_config_tc_stats_82599(struct ixgbe_hw *hw)
 278 {
 279         u32 reg = 0;
 280         u8  i   = 0;
 281
 282         /*
 283          * Receive Queues stats setting
 284          * 32 RQSMR registers, each configuring 4 queues.
 285          * Set all 16 queues of each TC to the same stat
 286          * with TC 'n' going to stat 'n'.
 287          */
 288         for (i = 0; i < 32; i++) {
 289                 reg = 0x01010101 * (i / 4);
 290                 IXGBE_WRITE_REG(hw, IXGBE_RQSMR(i), reg);
 291         }
 292         /*
 293          * Transmit Queues stats setting
 294          * 32 TQSM registers, each controlling 4 queues.
 295          * Set all queues of each TC to the same stat
 296          * with TC 'n' going to stat 'n'.
 297          * Tx queues are allocated non-uniformly to TCs:
 298          * 32, 32, 16, 16, 8, 8, 8, 8.
 299          */
 300         for (i = 0; i < 32; i++) {
 301                 if (i < 8)
 302                         reg = 0x00000000;
 303                 else if (i < 16)
 304                         reg = 0x01010101;
 305                 else if (i < 20)
 306                         reg = 0x02020202;
 307                 else if (i < 24)
 308                         reg = 0x03030303;
 309                 else if (i < 26)
 310                         reg = 0x04040404;
 311                 else if (i < 28)
 312                         reg = 0x05050505;
 313                 else if (i < 30)
 314                         reg = 0x06060606;
 315                 else
 316                         reg = 0x07070707;
 317                 IXGBE_WRITE_REG(hw, IXGBE_TQSM(i), reg);
 318         }
 319
 320         return 0;
 321 }
 322
 323 /**
 324  * ixgbe_dcb_hw_config_82599 - Configure and enable DCB
 325  * @hw: pointer to hardware structure
 326  * @refill: refill credits index by traffic class
 327  * @max: max credits index by traffic class
 328  * @bwg_id: bandwidth grouping indexed by traffic class
 329  * @prio_type: priority type indexed by traffic class
 330  * @pfc_en: enabled pfc bitmask
 331  *
 332  * Configure dcb settings and enable dcb mode.
 333  */
 334 s32 ixgbe_dcb_hw_config_82599(struct ixgbe_hw *hw, u8 pfc_en, u16 *refill,
 335                               u16 *max, u8 *bwg_id, u8 *prio_type, u8 *prio_tc)
 336 {
 337         ixgbe_dcb_config_rx_arbiter_82599(hw, refill, max, bwg_id,
 338                                           prio_type, prio_tc);
 339         ixgbe_dcb_config_tx_desc_arbiter_82599(hw, refill, max,
 340                                                bwg_id, prio_type);
 341         ixgbe_dcb_config_tx_data_arbiter_82599(hw, refill, max,
 342                                                bwg_id, prio_type, prio_tc);
 343         ixgbe_dcb_config_pfc_82599(hw, pfc_en);
 344         ixgbe_dcb_config_tc_stats_82599(hw);
 345
 346         return 0;
 347 }
 348