drivers/net/ethernet/intel/fm10k/fm10k_iov.c

   1 /* Intel Ethernet Switch Host Interface Driver
   2  * Copyright(c) 2013 - 2015 Intel Corporation.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * The full GNU General Public License is included in this distribution in
  14  * the file called "COPYING".
  15  *
  16  * Contact Information:
  17  * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  18  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  19  */
  20
  21 #include "fm10k.h"
  22 #include "fm10k_vf.h"
  23 #include "fm10k_pf.h"
  24
  25 static s32 fm10k_iov_msg_error(struct fm10k_hw *hw, u32 **results,
  26                                struct fm10k_mbx_info *mbx)
  27 {
  28         struct fm10k_vf_info *vf_info = (struct fm10k_vf_info *)mbx;
  29         struct fm10k_intfc *interface = hw->back;
  30         struct pci_dev *pdev = interface->pdev;
  31
  32         dev_err(&pdev->dev, "Unknown message ID %u on VF %d\n",
  33                 **results & FM10K_TLV_ID_MASK, vf_info->vf_idx);
  34
  35         return fm10k_tlv_msg_error(hw, results, mbx);
  36 }
  37
  38 static const struct fm10k_msg_data iov_mbx_data[] = {
  39         FM10K_TLV_MSG_TEST_HANDLER(fm10k_tlv_msg_test),
  40         FM10K_VF_MSG_MSIX_HANDLER(fm10k_iov_msg_msix_pf),
  41         FM10K_VF_MSG_MAC_VLAN_HANDLER(fm10k_iov_msg_mac_vlan_pf),
  42         FM10K_VF_MSG_LPORT_STATE_HANDLER(fm10k_iov_msg_lport_state_pf),
  43         FM10K_TLV_MSG_ERROR_HANDLER(fm10k_iov_msg_error),
  44 };
  45
  46 s32 fm10k_iov_event(struct fm10k_intfc *interface)
  47 {
  48         struct fm10k_hw *hw = &interface->hw;
  49         struct fm10k_iov_data *iov_data;
  50         s64 vflre;
  51         int i;
  52
  53         /* if there is no iov_data then there is no mailboxes to process */
  54         if (!ACCESS_ONCE(interface->iov_data))
  55                 return 0;
  56
  57         rcu_read_lock();
  58
  59         iov_data = interface->iov_data;
  60
  61         /* check again now that we are in the RCU block */
  62         if (!iov_data)
  63                 goto read_unlock;
  64
  65         if (!(fm10k_read_reg(hw, FM10K_EICR) & FM10K_EICR_VFLR))
  66                 goto read_unlock;
  67
  68         /* read VFLRE to determine if any VFs have been reset */
  69         do {
  70                 vflre = fm10k_read_reg(hw, FM10K_PFVFLRE(0));
  71                 vflre <<= 32;
  72                 vflre |= fm10k_read_reg(hw, FM10K_PFVFLRE(1));
  73                 vflre = (vflre << 32) | (vflre >> 32);
  74                 vflre |= fm10k_read_reg(hw, FM10K_PFVFLRE(0));
  75
  76                 i = iov_data->num_vfs;
  77
  78                 for (vflre <<= 64 - i; vflre && i--; vflre += vflre) {
  79                         struct fm10k_vf_info *vf_info = &iov_data->vf_info[i];
  80
  81                         if (vflre >= 0)
  82                                 continue;
  83
  84                         hw->iov.ops.reset_resources(hw, vf_info);
  85                         vf_info->mbx.ops.connect(hw, &vf_info->mbx);
  86                 }
  87         } while (i != iov_data->num_vfs);
  88
  89 read_unlock:
  90         rcu_read_unlock();
  91
  92         return 0;
  93 }
  94
  95 s32 fm10k_iov_mbx(struct fm10k_intfc *interface)
  96 {
  97         struct fm10k_hw *hw = &interface->hw;
  98         struct fm10k_iov_data *iov_data;
  99         int i;
 100
 101         /* if there is no iov_data then there is no mailboxes to process */
 102         if (!ACCESS_ONCE(interface->iov_data))
 103                 return 0;
 104
 105         rcu_read_lock();
 106
 107         iov_data = interface->iov_data;
 108
 109         /* check again now that we are in the RCU block */
 110         if (!iov_data)
 111                 goto read_unlock;
 112
 113         /* lock the mailbox for transmit and receive */
 114         fm10k_mbx_lock(interface);
 115
 116         /* Most VF messages sent to the PF cause the PF to respond by
 117          * requesting from the SM mailbox. This means that too many VF
 118          * messages processed at once could cause a mailbox timeout on the PF.
 119          * To prevent this, store a pointer to the next VF mbx to process. Use
 120          * that as the start of the loop so that we don't starve whichever VF
 121          * got ignored on the previous run.
 122          */
 123 process_mbx:
 124         for (i = iov_data->next_vf_mbx ? : iov_data->num_vfs; i--;) {
 125                 struct fm10k_vf_info *vf_info = &iov_data->vf_info[i];
 126                 struct fm10k_mbx_info *mbx = &vf_info->mbx;
 127                 u16 glort = vf_info->glort;
 128
 129                 /* verify port mapping is valid, if not reset port */
 130                 if (vf_info->vf_flags && !fm10k_glort_valid_pf(hw, glort))
 131                         hw->iov.ops.reset_lport(hw, vf_info);
 132
 133                 /* reset VFs that have mailbox timed out */
 134                 if (!mbx->timeout) {
 135                         hw->iov.ops.reset_resources(hw, vf_info);
 136                         mbx->ops.connect(hw, mbx);
 137                 }
 138
 139                 /* guarantee we have free space in the SM mailbox */
 140                 if (!hw->mbx.ops.tx_ready(&hw->mbx, FM10K_VFMBX_MSG_MTU))
 141                         break;
 142
 143                 /* cleanup mailbox and process received messages */
 144                 mbx->ops.process(hw, mbx);
 145         }
 146
 147         /* if we stopped processing mailboxes early, update next_vf_mbx.
 148          * Otherwise, reset next_vf_mbx, and restart loop so that we process
 149          * the remaining mailboxes we skipped at the start.
 150          */
 151         if (i >= 0) {
 152                 iov_data->next_vf_mbx = i + 1;
 153         } else if (iov_data->next_vf_mbx) {
 154                 iov_data->next_vf_mbx = 0;
 155                 goto process_mbx;
 156         }
 157
 158         /* free the lock */
 159         fm10k_mbx_unlock(interface);
 160
 161 read_unlock:
 162         rcu_read_unlock();
 163
 164         return 0;
 165 }
 166
 167 void fm10k_iov_suspend(struct pci_dev *pdev)
 168 {
 169         struct fm10k_intfc *interface = pci_get_drvdata(pdev);
 170         struct fm10k_iov_data *iov_data = interface->iov_data;
 171         struct fm10k_hw *hw = &interface->hw;
 172         int num_vfs, i;
 173
 174         /* pull out num_vfs from iov_data */
 175         num_vfs = iov_data ? iov_data->num_vfs : 0;
 176
 177         /* shut down queue mapping for VFs */
 178         fm10k_write_reg(hw, FM10K_DGLORTMAP(fm10k_dglort_vf_rss),
 179                         FM10K_DGLORTMAP_NONE);
 180
 181         /* Stop any active VFs and reset their resources */
 182         for (i = 0; i < num_vfs; i++) {
 183                 struct fm10k_vf_info *vf_info = &iov_data->vf_info[i];
 184
 185                 hw->iov.ops.reset_resources(hw, vf_info);
 186                 hw->iov.ops.reset_lport(hw, vf_info);
 187         }
 188 }
 189
 190 int fm10k_iov_resume(struct pci_dev *pdev)
 191 {
 192         struct fm10k_intfc *interface = pci_get_drvdata(pdev);
 193         struct fm10k_iov_data *iov_data = interface->iov_data;
 194         struct fm10k_dglort_cfg dglort = { 0 };
 195         struct fm10k_hw *hw = &interface->hw;
 196         int num_vfs, i;
 197
 198         /* pull out num_vfs from iov_data */
 199         num_vfs = iov_data ? iov_data->num_vfs : 0;
 200
 201         /* return error if iov_data is not already populated */
 202         if (!iov_data)
 203                 return -ENOMEM;
 204
 205         /* allocate hardware resources for the VFs */
 206         hw->iov.ops.assign_resources(hw, num_vfs, num_vfs);
 207
 208         /* configure DGLORT mapping for RSS */
 209         dglort.glort = hw->mac.dglort_map & FM10K_DGLORTMAP_NONE;
 210         dglort.idx = fm10k_dglort_vf_rss;
 211         dglort.inner_rss = 1;
 212         dglort.rss_l = fls(fm10k_queues_per_pool(hw) - 1);
 213         dglort.queue_b = fm10k_vf_queue_index(hw, 0);
 214         dglort.vsi_l = fls(hw->iov.total_vfs - 1);
 215         dglort.vsi_b = 1;
 216
 217         hw->mac.ops.configure_dglort_map(hw, &dglort);
 218
 219         /* assign resources to the device */
 220         for (i = 0; i < num_vfs; i++) {
 221                 struct fm10k_vf_info *vf_info = &iov_data->vf_info[i];
 222
 223                 /* allocate all but the last GLORT to the VFs */
 224                 if (i == ((~hw->mac.dglort_map) >> FM10K_DGLORTMAP_MASK_SHIFT))
 225                         break;
 226
 227                 /* assign GLORT to VF, and restrict it to multicast */
 228                 hw->iov.ops.set_lport(hw, vf_info, i,
 229                                       FM10K_VF_FLAG_MULTI_CAPABLE);
 230
 231                 /* assign our default vid to the VF following reset */
 232                 vf_info->sw_vid = hw->mac.default_vid;
 233
 234                 /* mailbox is disconnected so we don't send a message */
 235                 hw->iov.ops.assign_default_mac_vlan(hw, vf_info);
 236
 237                 /* now we are ready so we can connect */
 238                 vf_info->mbx.ops.connect(hw, &vf_info->mbx);
 239         }
 240
 241         return 0;
 242 }
 243
 244 s32 fm10k_iov_update_pvid(struct fm10k_intfc *interface, u16 glort, u16 pvid)
 245 {
 246         struct fm10k_iov_data *iov_data = interface->iov_data;
 247         struct fm10k_hw *hw = &interface->hw;
 248         struct fm10k_vf_info *vf_info;
 249         u16 vf_idx = (glort - hw->mac.dglort_map) & FM10K_DGLORTMAP_NONE;
 250
 251         /* no IOV support, not our message to process */
 252         if (!iov_data)
 253                 return FM10K_ERR_PARAM;
 254
 255         /* glort outside our range, not our message to process */
 256         if (vf_idx >= iov_data->num_vfs)
 257                 return FM10K_ERR_PARAM;
 258
 259         /* determine if an update has occurred and if so notify the VF */
 260         vf_info = &iov_data->vf_info[vf_idx];
 261         if (vf_info->sw_vid != pvid) {
 262                 vf_info->sw_vid = pvid;
 263                 hw->iov.ops.assign_default_mac_vlan(hw, vf_info);
 264         }
 265
 266         return 0;
 267 }
 268
 269 static void fm10k_iov_free_data(struct pci_dev *pdev)
 270 {
 271         struct fm10k_intfc *interface = pci_get_drvdata(pdev);
 272
 273         if (!interface->iov_data)
 274                 return;
 275
 276         /* reclaim hardware resources */
 277         fm10k_iov_suspend(pdev);
 278
 279         /* drop iov_data from interface */
 280         kfree_rcu(interface->iov_data, rcu);
 281         interface->iov_data = NULL;
 282 }
 283
 284 static s32 fm10k_iov_alloc_data(struct pci_dev *pdev, int num_vfs)
 285 {
 286         struct fm10k_intfc *interface = pci_get_drvdata(pdev);
 287         struct fm10k_iov_data *iov_data = interface->iov_data;
 288         struct fm10k_hw *hw = &interface->hw;
 289         size_t size;
 290         int i, err;
 291
 292         /* return error if iov_data is already populated */
 293         if (iov_data)
 294                 return -EBUSY;
 295
 296         /* The PF should always be able to assign resources */
 297         if (!hw->iov.ops.assign_resources)
 298                 return -ENODEV;
 299
 300         /* nothing to do if no VFs are requested */
 301         if (!num_vfs)
 302                 return 0;
 303
 304         /* allocate memory for VF storage */
 305         size = offsetof(struct fm10k_iov_data, vf_info[num_vfs]);
 306         iov_data = kzalloc(size, GFP_KERNEL);
 307         if (!iov_data)
 308                 return -ENOMEM;
 309
 310         /* record number of VFs */
 311         iov_data->num_vfs = num_vfs;
 312
 313         /* loop through vf_info structures initializing each entry */
 314         for (i = 0; i < num_vfs; i++) {
 315                 struct fm10k_vf_info *vf_info = &iov_data->vf_info[i];
 316
 317                 /* Record VF VSI value */
 318                 vf_info->vsi = i + 1;
 319                 vf_info->vf_idx = i;
 320
 321                 /* initialize mailbox memory */
 322                 err = fm10k_pfvf_mbx_init(hw, &vf_info->mbx, iov_mbx_data, i);
 323                 if (err) {
 324                         dev_err(&pdev->dev,
 325                                 "Unable to initialize SR-IOV mailbox\n");
 326                         kfree(iov_data);
 327                         return err;
 328                 }
 329         }
 330
 331         /* assign iov_data to interface */
 332         interface->iov_data = iov_data;
 333
 334         /* allocate hardware resources for the VFs */
 335         fm10k_iov_resume(pdev);
 336
 337         return 0;
 338 }
 339
 340 void fm10k_iov_disable(struct pci_dev *pdev)
 341 {
 342         if (pci_num_vf(pdev) && pci_vfs_assigned(pdev))
 343                 dev_err(&pdev->dev,
 344                         "Cannot disable SR-IOV while VFs are assigned\n");
 345         else
 346                 pci_disable_sriov(pdev);
 347
 348         fm10k_iov_free_data(pdev);
 349 }
 350
 351 static void fm10k_disable_aer_comp_abort(struct pci_dev *pdev)
 352 {
 353         u32 err_sev;
 354         int pos;
 355
 356         pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
 357         if (!pos)
 358                 return;
 359
 360         pci_read_config_dword(pdev, pos + PCI_ERR_UNCOR_SEVER, &err_sev);
 361         err_sev &= ~PCI_ERR_UNC_COMP_ABORT;
 362         pci_write_config_dword(pdev, pos + PCI_ERR_UNCOR_SEVER, err_sev);
 363 }
 364
 365 int fm10k_iov_configure(struct pci_dev *pdev, int num_vfs)
 366 {
 367         int current_vfs = pci_num_vf(pdev);
 368         int err = 0;
 369
 370         if (current_vfs && pci_vfs_assigned(pdev)) {
 371                 dev_err(&pdev->dev,
 372                         "Cannot modify SR-IOV while VFs are assigned\n");
 373                 num_vfs = current_vfs;
 374         } else {
 375                 pci_disable_sriov(pdev);
 376                 fm10k_iov_free_data(pdev);
 377         }
 378
 379         /* allocate resources for the VFs */
 380         err = fm10k_iov_alloc_data(pdev, num_vfs);
 381         if (err)
 382                 return err;
 383
 384         /* allocate VFs if not already allocated */
 385         if (num_vfs && (num_vfs != current_vfs)) {
 386                 /* Disable completer abort error reporting as
 387                  * the VFs can trigger this any time they read a queue
 388                  * that they don't own.
 389                  */
 390                 fm10k_disable_aer_comp_abort(pdev);
 391
 392                 err = pci_enable_sriov(pdev, num_vfs);
 393                 if (err) {
 394                         dev_err(&pdev->dev,
 395                                 "Enable PCI SR-IOV failed: %d\n", err);
 396                         return err;
 397                 }
 398         }
 399
 400         return num_vfs;
 401 }
 402
 403 static inline void fm10k_reset_vf_info(struct fm10k_intfc *interface,
 404                                        struct fm10k_vf_info *vf_info)
 405 {
 406         struct fm10k_hw *hw = &interface->hw;
 407
 408         /* assigning the MAC address will send a mailbox message */
 409         fm10k_mbx_lock(interface);
 410
 411         /* disable LPORT for this VF which clears switch rules */
 412         hw->iov.ops.reset_lport(hw, vf_info);
 413
 414         /* assign new MAC+VLAN for this VF */
 415         hw->iov.ops.assign_default_mac_vlan(hw, vf_info);
 416
 417         /* re-enable the LPORT for this VF */
 418         hw->iov.ops.set_lport(hw, vf_info, vf_info->vf_idx,
 419                               FM10K_VF_FLAG_MULTI_CAPABLE);
 420
 421         fm10k_mbx_unlock(interface);
 422 }
 423
 424 int fm10k_ndo_set_vf_mac(struct net_device *netdev, int vf_idx, u8 *mac)
 425 {
 426         struct fm10k_intfc *interface = netdev_priv(netdev);
 427         struct fm10k_iov_data *iov_data = interface->iov_data;
 428         struct fm10k_vf_info *vf_info;
 429
 430         /* verify SR-IOV is active and that vf idx is valid */
 431         if (!iov_data || vf_idx >= iov_data->num_vfs)
 432                 return -EINVAL;
 433
 434         /* verify MAC addr is valid */
 435         if (!is_zero_ether_addr(mac) && !is_valid_ether_addr(mac))
 436                 return -EINVAL;
 437
 438         /* record new MAC address */
 439         vf_info = &iov_data->vf_info[vf_idx];
 440         ether_addr_copy(vf_info->mac, mac);
 441
 442         fm10k_reset_vf_info(interface, vf_info);
 443
 444         return 0;
 445 }
 446
 447 int fm10k_ndo_set_vf_vlan(struct net_device *netdev, int vf_idx, u16 vid,
 448                           u8 qos)
 449 {
 450         struct fm10k_intfc *interface = netdev_priv(netdev);
 451         struct fm10k_iov_data *iov_data = interface->iov_data;
 452         struct fm10k_hw *hw = &interface->hw;
 453         struct fm10k_vf_info *vf_info;
 454
 455         /* verify SR-IOV is active and that vf idx is valid */
 456         if (!iov_data || vf_idx >= iov_data->num_vfs)
 457                 return -EINVAL;
 458
 459         /* QOS is unsupported and VLAN IDs accepted range 0-4094 */
 460         if (qos || (vid > (VLAN_VID_MASK - 1)))
 461                 return -EINVAL;
 462
 463         vf_info = &iov_data->vf_info[vf_idx];
 464
 465         /* exit if there is nothing to do */
 466         if (vf_info->pf_vid == vid)
 467                 return 0;
 468
 469         /* record default VLAN ID for VF */
 470         vf_info->pf_vid = vid;
 471
 472         /* Clear the VLAN table for the VF */
 473         hw->mac.ops.update_vlan(hw, FM10K_VLAN_ALL, vf_info->vsi, false);
 474
 475         fm10k_reset_vf_info(interface, vf_info);
 476
 477         return 0;
 478 }
 479
 480 int fm10k_ndo_set_vf_bw(struct net_device *netdev, int vf_idx,
 481                         int __always_unused unused, int rate)
 482 {
 483         struct fm10k_intfc *interface = netdev_priv(netdev);
 484         struct fm10k_iov_data *iov_data = interface->iov_data;
 485         struct fm10k_hw *hw = &interface->hw;
 486
 487         /* verify SR-IOV is active and that vf idx is valid */
 488         if (!iov_data || vf_idx >= iov_data->num_vfs)
 489                 return -EINVAL;
 490
 491         /* rate limit cannot be less than 10Mbs or greater than link speed */
 492         if (rate && ((rate < FM10K_VF_TC_MIN) || rate > FM10K_VF_TC_MAX))
 493                 return -EINVAL;
 494
 495         /* store values */
 496         iov_data->vf_info[vf_idx].rate = rate;
 497
 498         /* update hardware configuration */
 499         hw->iov.ops.configure_tc(hw, vf_idx, rate);
 500
 501         return 0;
 502 }
 503
 504 int fm10k_ndo_get_vf_config(struct net_device *netdev,
 505                             int vf_idx, struct ifla_vf_info *ivi)
 506 {
 507         struct fm10k_intfc *interface = netdev_priv(netdev);
 508         struct fm10k_iov_data *iov_data = interface->iov_data;
 509         struct fm10k_vf_info *vf_info;
 510
 511         /* verify SR-IOV is active and that vf idx is valid */
 512         if (!iov_data || vf_idx >= iov_data->num_vfs)
 513                 return -EINVAL;
 514
 515         vf_info = &iov_data->vf_info[vf_idx];
 516
 517         ivi->vf = vf_idx;
 518         ivi->max_tx_rate = vf_info->rate;
 519         ivi->min_tx_rate = 0;
 520         ether_addr_copy(ivi->mac, vf_info->mac);
 521         ivi->vlan = vf_info->pf_vid;
 522         ivi->qos = 0;
 523
 524         return 0;
 525 }