release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/net/ixgbe/ixgbe_dcb_82598.c

   1 /*******************************************************************************
   2
   3   Intel 10 Gigabit PCI Express Linux driver
   4   Copyright(c) 1999 - 2010 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_82598.h"
  33
  34 /**
  35  * ixgbe_dcb_get_tc_stats_82598 - Return status data for each traffic class
  36  * @hw: pointer to hardware structure
  37  * @stats: pointer to statistics structure
  38  * @tc_count:  Number of elements in bwg_array.
  39  *
  40  * This function returns the status data for each of the Traffic Classes in use.
  41  */
  42 s32 ixgbe_dcb_get_tc_stats_82598(struct ixgbe_hw *hw,
  43                                  struct ixgbe_hw_stats *stats,
  44                                  u8 tc_count)
  45 {
  46         int tc;
  47
  48         if (tc_count > MAX_TRAFFIC_CLASS)
  49                 return DCB_ERR_PARAM;
  50
  51         /* Statistics pertaining to each traffic class */
  52         for (tc = 0; tc < tc_count; tc++) {
  53                 /* Transmitted Packets */
  54                 stats->qptc[tc] += IXGBE_READ_REG(hw, IXGBE_QPTC(tc));
  55                 /* Transmitted Bytes */
  56                 stats->qbtc[tc] += IXGBE_READ_REG(hw, IXGBE_QBTC(tc));
  57                 /* Received Packets */
  58                 stats->qprc[tc] += IXGBE_READ_REG(hw, IXGBE_QPRC(tc));
  59                 /* Received Bytes */
  60                 stats->qbrc[tc] += IXGBE_READ_REG(hw, IXGBE_QBRC(tc));
  61         }
  62
  63         return 0;
  64 }
  65
  66 /**
  67  * ixgbe_dcb_get_pfc_stats_82598 - Returns CBFC status data
  68  * @hw: pointer to hardware structure
  69  * @stats: pointer to statistics structure
  70  * @tc_count:  Number of elements in bwg_array.
  71  *
  72  * This function returns the CBFC status data for each of the Traffic Classes.
  73  */
  74 s32 ixgbe_dcb_get_pfc_stats_82598(struct ixgbe_hw *hw,
  75                                   struct ixgbe_hw_stats *stats,
  76                                   u8 tc_count)
  77 {
  78         int tc;
  79
  80         if (tc_count > MAX_TRAFFIC_CLASS)
  81                 return DCB_ERR_PARAM;
  82
  83         for (tc = 0; tc < tc_count; tc++) {
  84                 /* Priority XOFF Transmitted */
  85                 stats->pxofftxc[tc] += IXGBE_READ_REG(hw, IXGBE_PXOFFTXC(tc));
  86                 /* Priority XOFF Received */
  87                 stats->pxoffrxc[tc] += IXGBE_READ_REG(hw, IXGBE_PXOFFRXC(tc));
  88         }
  89
  90         return 0;
  91 }
  92
  93 /**
  94  * ixgbe_dcb_config_packet_buffers_82598 - Configure packet buffers
  95  * @hw: pointer to hardware structure
  96  * @dcb_config: pointer to ixgbe_dcb_config structure
  97  *
  98  * Configure packet buffers for DCB mode.
  99  */
 100 static s32 ixgbe_dcb_config_packet_buffers_82598(struct ixgbe_hw *hw,
 101                                                  struct ixgbe_dcb_config *dcb_config)
 102 {
 103         s32 ret_val = 0;
 104         u32 value = IXGBE_RXPBSIZE_64KB;
 105         u8  i = 0;
 106
 107         /* Setup Rx packet buffer sizes */
 108         switch (dcb_config->rx_pba_cfg) {
 109         case pba_80_48:
 110                 /* Setup the first four at 80KB */
 111                 value = IXGBE_RXPBSIZE_80KB;
 112                 for (; i < 4; i++)
 113                         IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(i), value);
 114                 /* Setup the last four at 48KB...don't re-init i */
 115                 value = IXGBE_RXPBSIZE_48KB;
 116                 /* Fall Through */
 117         case pba_equal:
 118         default:
 119                 for (; i < IXGBE_MAX_PACKET_BUFFERS; i++)
 120                         IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(i), value);
 121
 122                 /* Setup Tx packet buffer sizes */
 123                 for (i = 0; i < IXGBE_MAX_PACKET_BUFFERS; i++) {
 124                         IXGBE_WRITE_REG(hw, IXGBE_TXPBSIZE(i),
 125                                         IXGBE_TXPBSIZE_40KB);
 126                 }
 127                 break;
 128         }
 129
 130         return ret_val;
 131 }
 132
 133 /**
 134  * ixgbe_dcb_config_rx_arbiter_82598 - Config Rx data arbiter
 135  * @hw: pointer to hardware structure
 136  * @dcb_config: pointer to ixgbe_dcb_config structure
 137  *
 138  * Configure Rx Data Arbiter and credits for each traffic class.
 139  */
 140 s32 ixgbe_dcb_config_rx_arbiter_82598(struct ixgbe_hw *hw,
 141                                       struct ixgbe_dcb_config *dcb_config)
 142 {
 143         struct tc_bw_alloc    *p;
 144         u32    reg           = 0;
 145         u32    credit_refill = 0;
 146         u32    credit_max    = 0;
 147         u8     i             = 0;
 148
 149         reg = IXGBE_READ_REG(hw, IXGBE_RUPPBMR) | IXGBE_RUPPBMR_MQA;
 150         IXGBE_WRITE_REG(hw, IXGBE_RUPPBMR, reg);
 151
 152         reg = IXGBE_READ_REG(hw, IXGBE_RMCS);
 153         /* Enable Arbiter */
 154         reg &= ~IXGBE_RMCS_ARBDIS;
 155         /* Enable Receive Recycle within the BWG */
 156         reg |= IXGBE_RMCS_RRM;
 157         /* Enable Deficit Fixed Priority arbitration*/
 158         reg |= IXGBE_RMCS_DFP;
 159
 160         IXGBE_WRITE_REG(hw, IXGBE_RMCS, reg);
 161
 162         /* Configure traffic class credits and priority */
 163         for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
 164                 p = &dcb_config->tc_config[i].path[DCB_RX_CONFIG];
 165                 credit_refill = p->data_credits_refill;
 166                 credit_max    = p->data_credits_max;
 167
 168                 reg = credit_refill | (credit_max << IXGBE_RT2CR_MCL_SHIFT);
 169
 170                 if (p->prio_type == prio_link)
 171                         reg |= IXGBE_RT2CR_LSP;
 172
 173                 IXGBE_WRITE_REG(hw, IXGBE_RT2CR(i), reg);
 174         }
 175
 176         reg = IXGBE_READ_REG(hw, IXGBE_RDRXCTL);
 177         reg |= IXGBE_RDRXCTL_RDMTS_1_2;
 178         reg |= IXGBE_RDRXCTL_MPBEN;
 179         reg |= IXGBE_RDRXCTL_MCEN;
 180         IXGBE_WRITE_REG(hw, IXGBE_RDRXCTL, reg);
 181
 182         reg = IXGBE_READ_REG(hw, IXGBE_RXCTRL);
 183         /* Make sure there is enough descriptors before arbitration */
 184         reg &= ~IXGBE_RXCTRL_DMBYPS;
 185         IXGBE_WRITE_REG(hw, IXGBE_RXCTRL, reg);
 186
 187         return 0;
 188 }
 189
 190 /**
 191  * ixgbe_dcb_config_tx_desc_arbiter_82598 - Config Tx Desc. arbiter
 192  * @hw: pointer to hardware structure
 193  * @dcb_config: pointer to ixgbe_dcb_config structure
 194  *
 195  * Configure Tx Descriptor Arbiter and credits for each traffic class.
 196  */
 197 s32 ixgbe_dcb_config_tx_desc_arbiter_82598(struct ixgbe_hw *hw,
 198                                            struct ixgbe_dcb_config *dcb_config)
 199 {
 200         struct tc_bw_alloc *p;
 201         u32    reg, max_credits;
 202         u8     i;
 203
 204         reg = IXGBE_READ_REG(hw, IXGBE_DPMCS);
 205
 206         /* Enable arbiter */
 207         reg &= ~IXGBE_DPMCS_ARBDIS;
 208         if (!(dcb_config->round_robin_enable)) {
 209                 /* Enable DFP and Recycle mode */
 210                 reg |= (IXGBE_DPMCS_TDPAC | IXGBE_DPMCS_TRM);
 211         }
 212         reg |= IXGBE_DPMCS_TSOEF;
 213         /* Configure Max TSO packet size 34KB including payload and headers */
 214         reg |= (0x4 << IXGBE_DPMCS_MTSOS_SHIFT);
 215
 216         IXGBE_WRITE_REG(hw, IXGBE_DPMCS, reg);
 217
 218         /* Configure traffic class credits and priority */
 219         for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
 220                 p = &dcb_config->tc_config[i].path[DCB_TX_CONFIG];
 221                 max_credits = dcb_config->tc_config[i].desc_credits_max;
 222                 reg = max_credits << IXGBE_TDTQ2TCCR_MCL_SHIFT;
 223                 reg |= p->data_credits_refill;
 224                 reg |= (u32)(p->bwg_id) << IXGBE_TDTQ2TCCR_BWG_SHIFT;
 225
 226                 if (p->prio_type == prio_group)
 227                         reg |= IXGBE_TDTQ2TCCR_GSP;
 228
 229                 if (p->prio_type == prio_link)
 230                         reg |= IXGBE_TDTQ2TCCR_LSP;
 231
 232                 IXGBE_WRITE_REG(hw, IXGBE_TDTQ2TCCR(i), reg);
 233         }
 234
 235         return 0;
 236 }
 237
 238 /**
 239  * ixgbe_dcb_config_tx_data_arbiter_82598 - Config Tx data arbiter
 240  * @hw: pointer to hardware structure
 241  * @dcb_config: pointer to ixgbe_dcb_config structure
 242  *
 243  * Configure Tx Data Arbiter and credits for each traffic class.
 244  */
 245 s32 ixgbe_dcb_config_tx_data_arbiter_82598(struct ixgbe_hw *hw,
 246                                            struct ixgbe_dcb_config *dcb_config)
 247 {
 248         struct tc_bw_alloc *p;
 249         u32 reg;
 250         u8 i;
 251
 252         reg = IXGBE_READ_REG(hw, IXGBE_PDPMCS);
 253         /* Enable Data Plane Arbiter */
 254         reg &= ~IXGBE_PDPMCS_ARBDIS;
 255         /* Enable DFP and Transmit Recycle Mode */
 256         reg |= (IXGBE_PDPMCS_TPPAC | IXGBE_PDPMCS_TRM);
 257
 258         IXGBE_WRITE_REG(hw, IXGBE_PDPMCS, reg);
 259
 260         /* Configure traffic class credits and priority */
 261         for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
 262                 p = &dcb_config->tc_config[i].path[DCB_TX_CONFIG];
 263                 reg = p->data_credits_refill;
 264                 reg |= (u32)(p->data_credits_max) << IXGBE_TDPT2TCCR_MCL_SHIFT;
 265                 reg |= (u32)(p->bwg_id) << IXGBE_TDPT2TCCR_BWG_SHIFT;
 266
 267                 if (p->prio_type == prio_group)
 268                         reg |= IXGBE_TDPT2TCCR_GSP;
 269
 270                 if (p->prio_type == prio_link)
 271                         reg |= IXGBE_TDPT2TCCR_LSP;
 272
 273                 IXGBE_WRITE_REG(hw, IXGBE_TDPT2TCCR(i), reg);
 274         }
 275
 276         /* Enable Tx packet buffer division */
 277         reg = IXGBE_READ_REG(hw, IXGBE_DTXCTL);
 278         reg |= IXGBE_DTXCTL_ENDBUBD;
 279         IXGBE_WRITE_REG(hw, IXGBE_DTXCTL, reg);
 280
 281         return 0;
 282 }
 283
 284 /**
 285  * ixgbe_dcb_config_pfc_82598 - Config priority flow control
 286  * @hw: pointer to hardware structure
 287  * @dcb_config: pointer to ixgbe_dcb_config structure
 288  *
 289  * Configure Priority Flow Control for each traffic class.
 290  */
 291 s32 ixgbe_dcb_config_pfc_82598(struct ixgbe_hw *hw,
 292                                struct ixgbe_dcb_config *dcb_config)
 293 {
 294         u32 reg, rx_pba_size;
 295         u8  i;
 296
 297         if (!dcb_config->pfc_mode_enable)
 298                 goto out;
 299
 300         /* Enable Transmit Priority Flow Control */
 301         reg = IXGBE_READ_REG(hw, IXGBE_RMCS);
 302         reg &= ~IXGBE_RMCS_TFCE_802_3X;
 303         /* correct the reporting of our flow control status */
 304         reg |= IXGBE_RMCS_TFCE_PRIORITY;
 305         IXGBE_WRITE_REG(hw, IXGBE_RMCS, reg);
 306
 307         /* Enable Receive Priority Flow Control */
 308         reg = IXGBE_READ_REG(hw, IXGBE_FCTRL);
 309         reg &= ~IXGBE_FCTRL_RFCE;
 310         reg |= IXGBE_FCTRL_RPFCE;
 311         IXGBE_WRITE_REG(hw, IXGBE_FCTRL, reg);
 312
 313         /*
 314          * Configure flow control thresholds and enable priority flow control
 315          * for each traffic class.
 316          */
 317         for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
 318                 if (dcb_config->rx_pba_cfg == pba_equal) {
 319                         rx_pba_size = IXGBE_RXPBSIZE_64KB;
 320                 } else {
 321                         rx_pba_size = (i < 4) ? IXGBE_RXPBSIZE_80KB
 322                                               : IXGBE_RXPBSIZE_48KB;
 323                 }
 324
 325                 reg = ((rx_pba_size >> 5) &  0xFFF0);
 326                 if (dcb_config->tc_config[i].dcb_pfc == pfc_enabled_tx ||
 327                     dcb_config->tc_config[i].dcb_pfc == pfc_enabled_full)
 328                         reg |= IXGBE_FCRTL_XONE;
 329
 330                 IXGBE_WRITE_REG(hw, IXGBE_FCRTL(i), reg);
 331
 332                 reg = ((rx_pba_size >> 2) & 0xFFF0);
 333                 if (dcb_config->tc_config[i].dcb_pfc == pfc_enabled_tx ||
 334                     dcb_config->tc_config[i].dcb_pfc == pfc_enabled_full)
 335                         reg |= IXGBE_FCRTH_FCEN;
 336
 337                 IXGBE_WRITE_REG(hw, IXGBE_FCRTH(i), reg);
 338         }
 339
 340         /* Configure pause time */
 341         for (i = 0; i < (MAX_TRAFFIC_CLASS >> 1); i++)
 342                 IXGBE_WRITE_REG(hw, IXGBE_FCTTV(i), 0x68006800);
 343
 344         /* Configure flow control refresh threshold value */
 345         IXGBE_WRITE_REG(hw, IXGBE_FCRTV, 0x3400);
 346
 347 out:
 348         return 0;
 349 }
 350
 351 /**
 352  * ixgbe_dcb_config_tc_stats_82598 - Configure traffic class statistics
 353  * @hw: pointer to hardware structure
 354  *
 355  * Configure queue statistics registers, all queues belonging to same traffic
 356  * class uses a single set of queue statistics counters.
 357  */
 358 s32 ixgbe_dcb_config_tc_stats_82598(struct ixgbe_hw *hw)
 359 {
 360         u32 reg = 0;
 361         u8  i   = 0;
 362         u8  j   = 0;
 363
 364         /* Receive Queues stats setting -  8 queues per statistics reg */
 365         for (i = 0, j = 0; i < 15 && j < 8; i = i + 2, j++) {
 366                 reg = IXGBE_READ_REG(hw, IXGBE_RQSMR(i));
 367                 reg |= ((0x1010101) * j);
 368                 IXGBE_WRITE_REG(hw, IXGBE_RQSMR(i), reg);
 369                 reg = IXGBE_READ_REG(hw, IXGBE_RQSMR(i + 1));
 370                 reg |= ((0x1010101) * j);
 371                 IXGBE_WRITE_REG(hw, IXGBE_RQSMR(i + 1), reg);
 372         }
 373         /* Transmit Queues stats setting -  4 queues per statistics reg */
 374         for (i = 0; i < 8; i++) {
 375                 reg = IXGBE_READ_REG(hw, IXGBE_TQSMR(i));
 376                 reg |= ((0x1010101) * i);
 377                 IXGBE_WRITE_REG(hw, IXGBE_TQSMR(i), reg);
 378         }
 379
 380         return 0;
 381 }
 382
 383 /**
 384  * ixgbe_dcb_hw_config_82598 - Config and enable DCB
 385  * @hw: pointer to hardware structure
 386  * @dcb_config: pointer to ixgbe_dcb_config structure
 387  *
 388  * Configure dcb settings and enable dcb mode.
 389  */
 390 s32 ixgbe_dcb_hw_config_82598(struct ixgbe_hw *hw,
 391                               struct ixgbe_dcb_config *dcb_config)
 392 {
 393         ixgbe_dcb_config_packet_buffers_82598(hw, dcb_config);
 394         ixgbe_dcb_config_rx_arbiter_82598(hw, dcb_config);
 395         ixgbe_dcb_config_tx_desc_arbiter_82598(hw, dcb_config);
 396         ixgbe_dcb_config_tx_data_arbiter_82598(hw, dcb_config);
 397         ixgbe_dcb_config_pfc_82598(hw, dcb_config);
 398         ixgbe_dcb_config_tc_stats_82598(hw);
 399
 400         return 0;
 401 }