root/drivers/net/ethernet/intel/iavf/iavf_ethtool.c

DEFINITIONS

1. iavf_add_one_ethtool_stat
2. __iavf_add_ethtool_stats
3. iavf_add_queue_stats
4. __iavf_add_stat_strings
5. iavf_get_link_ksettings
6. iavf_get_sset_count
7. iavf_get_ethtool_stats
8. iavf_get_priv_flag_strings
9. iavf_get_stat_strings
10. iavf_get_strings
11. iavf_get_priv_flags
12. iavf_set_priv_flags
13. iavf_get_msglevel
14. iavf_set_msglevel
15. iavf_get_drvinfo
16. iavf_get_ringparam
17. iavf_set_ringparam
18. __iavf_get_coalesce
19. iavf_get_coalesce
20. iavf_get_per_queue_coalesce
21. iavf_set_itr_per_queue
22. __iavf_set_coalesce
23. iavf_set_coalesce
24. iavf_set_per_queue_coalesce
25. iavf_get_rxnfc
26. iavf_get_channels
27. iavf_set_channels
28. iavf_get_rxfh_key_size
29. iavf_get_rxfh_indir_size
30. iavf_get_rxfh
31. iavf_set_rxfh
32. iavf_set_ethtool_ops

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright(c) 2013 - 2018 Intel Corporation. */
   3 
   4 /* ethtool support for iavf */
   5 #include "iavf.h"
   6 
   7 #include <linux/uaccess.h>
   8 
   9 /* ethtool statistics helpers */
  10 
  11 /**
  12  * struct iavf_stats - definition for an ethtool statistic
  13  * @stat_string: statistic name to display in ethtool -S output
  14  * @sizeof_stat: the sizeof() the stat, must be no greater than sizeof(u64)
  15  * @stat_offset: offsetof() the stat from a base pointer
  16  *
  17  * This structure defines a statistic to be added to the ethtool stats buffer.
  18  * It defines a statistic as offset from a common base pointer. Stats should
  19  * be defined in constant arrays using the IAVF_STAT macro, with every element
  20  * of the array using the same _type for calculating the sizeof_stat and
  21  * stat_offset.
  22  *
  23  * The @sizeof_stat is expected to be sizeof(u8), sizeof(u16), sizeof(u32) or
  24  * sizeof(u64). Other sizes are not expected and will produce a WARN_ONCE from
  25  * the iavf_add_ethtool_stat() helper function.
  26  *
  27  * The @stat_string is interpreted as a format string, allowing formatted
  28  * values to be inserted while looping over multiple structures for a given
  29  * statistics array. Thus, every statistic string in an array should have the
  30  * same type and number of format specifiers, to be formatted by variadic
  31  * arguments to the iavf_add_stat_string() helper function.
  32  **/
  33 struct iavf_stats {
  34         char stat_string[ETH_GSTRING_LEN];
  35         int sizeof_stat;
  36         int stat_offset;
  37 };
  38 
  39 /* Helper macro to define an iavf_stat structure with proper size and type.
  40  * Use this when defining constant statistics arrays. Note that @_type expects
  41  * only a type name and is used multiple times.
  42  */
  43 #define IAVF_STAT(_type, _name, _stat) { \
  44         .stat_string = _name, \
  45         .sizeof_stat = FIELD_SIZEOF(_type, _stat), \
  46         .stat_offset = offsetof(_type, _stat) \
  47 }
  48 
  49 /* Helper macro for defining some statistics related to queues */
  50 #define IAVF_QUEUE_STAT(_name, _stat) \
  51         IAVF_STAT(struct iavf_ring, _name, _stat)
  52 
  53 /* Stats associated with a Tx or Rx ring */
  54 static const struct iavf_stats iavf_gstrings_queue_stats[] = {
  55         IAVF_QUEUE_STAT("%s-%u.packets", stats.packets),
  56         IAVF_QUEUE_STAT("%s-%u.bytes", stats.bytes),
  57 };
  58 
  59 /**
  60  * iavf_add_one_ethtool_stat - copy the stat into the supplied buffer
  61  * @data: location to store the stat value
  62  * @pointer: basis for where to copy from
  63  * @stat: the stat definition
  64  *
  65  * Copies the stat data defined by the pointer and stat structure pair into
  66  * the memory supplied as data. Used to implement iavf_add_ethtool_stats and
  67  * iavf_add_queue_stats. If the pointer is null, data will be zero'd.
  68  */
  69 static void
  70 iavf_add_one_ethtool_stat(u64 *data, void *pointer,
  71                           const struct iavf_stats *stat)
  72 {
  73         char *p;
  74 
  75         if (!pointer) {
  76                 /* ensure that the ethtool data buffer is zero'd for any stats
  77                  * which don't have a valid pointer.
  78                  */
  79                 *data = 0;
  80                 return;
  81         }
  82 
  83         p = (char *)pointer + stat->stat_offset;
  84         switch (stat->sizeof_stat) {
  85         case sizeof(u64):
  86                 *data = *((u64 *)p);
  87                 break;
  88         case sizeof(u32):
  89                 *data = *((u32 *)p);
  90                 break;
  91         case sizeof(u16):
  92                 *data = *((u16 *)p);
  93                 break;
  94         case sizeof(u8):
  95                 *data = *((u8 *)p);
  96                 break;
  97         default:
  98                 WARN_ONCE(1, "unexpected stat size for %s",
  99                           stat->stat_string);
 100                 *data = 0;
 101         }
 102 }
 103 
 104 /**
 105  * __iavf_add_ethtool_stats - copy stats into the ethtool supplied buffer
 106  * @data: ethtool stats buffer
 107  * @pointer: location to copy stats from
 108  * @stats: array of stats to copy
 109  * @size: the size of the stats definition
 110  *
 111  * Copy the stats defined by the stats array using the pointer as a base into
 112  * the data buffer supplied by ethtool. Updates the data pointer to point to
 113  * the next empty location for successive calls to __iavf_add_ethtool_stats.
 114  * If pointer is null, set the data values to zero and update the pointer to
 115  * skip these stats.
 116  **/
 117 static void
 118 __iavf_add_ethtool_stats(u64 **data, void *pointer,
 119                          const struct iavf_stats stats[],
 120                          const unsigned int size)
 121 {
 122         unsigned int i;
 123 
 124         for (i = 0; i < size; i++)
 125                 iavf_add_one_ethtool_stat((*data)++, pointer, &stats[i]);
 126 }
 127 
 128 /**
 129  * iavf_add_ethtool_stats - copy stats into ethtool supplied buffer
 130  * @data: ethtool stats buffer
 131  * @pointer: location where stats are stored
 132  * @stats: static const array of stat definitions
 133  *
 134  * Macro to ease the use of __iavf_add_ethtool_stats by taking a static
 135  * constant stats array and passing the ARRAY_SIZE(). This avoids typos by
 136  * ensuring that we pass the size associated with the given stats array.
 137  *
 138  * The parameter @stats is evaluated twice, so parameters with side effects
 139  * should be avoided.
 140  **/
 141 #define iavf_add_ethtool_stats(data, pointer, stats) \
 142         __iavf_add_ethtool_stats(data, pointer, stats, ARRAY_SIZE(stats))
 143 
 144 /**
 145  * iavf_add_queue_stats - copy queue statistics into supplied buffer
 146  * @data: ethtool stats buffer
 147  * @ring: the ring to copy
 148  *
 149  * Queue statistics must be copied while protected by
 150  * u64_stats_fetch_begin_irq, so we can't directly use iavf_add_ethtool_stats.
 151  * Assumes that queue stats are defined in iavf_gstrings_queue_stats. If the
 152  * ring pointer is null, zero out the queue stat values and update the data
 153  * pointer. Otherwise safely copy the stats from the ring into the supplied
 154  * buffer and update the data pointer when finished.
 155  *
 156  * This function expects to be called while under rcu_read_lock().
 157  **/
 158 static void
 159 iavf_add_queue_stats(u64 **data, struct iavf_ring *ring)
 160 {
 161         const unsigned int size = ARRAY_SIZE(iavf_gstrings_queue_stats);
 162         const struct iavf_stats *stats = iavf_gstrings_queue_stats;
 163         unsigned int start;
 164         unsigned int i;
 165 
 166         /* To avoid invalid statistics values, ensure that we keep retrying
 167          * the copy until we get a consistent value according to
 168          * u64_stats_fetch_retry_irq. But first, make sure our ring is
 169          * non-null before attempting to access its syncp.
 170          */
 171         do {
 172                 start = !ring ? 0 : u64_stats_fetch_begin_irq(&ring->syncp);
 173                 for (i = 0; i < size; i++)
 174                         iavf_add_one_ethtool_stat(&(*data)[i], ring, &stats[i]);
 175         } while (ring && u64_stats_fetch_retry_irq(&ring->syncp, start));
 176 
 177         /* Once we successfully copy the stats in, update the data pointer */
 178         *data += size;
 179 }
 180 
 181 /**
 182  * __iavf_add_stat_strings - copy stat strings into ethtool buffer
 183  * @p: ethtool supplied buffer
 184  * @stats: stat definitions array
 185  * @size: size of the stats array
 186  *
 187  * Format and copy the strings described by stats into the buffer pointed at
 188  * by p.
 189  **/
 190 static void __iavf_add_stat_strings(u8 **p, const struct iavf_stats stats[],
 191                                     const unsigned int size, ...)
 192 {
 193         unsigned int i;
 194 
 195         for (i = 0; i < size; i++) {
 196                 va_list args;
 197 
 198                 va_start(args, size);
 199                 vsnprintf(*p, ETH_GSTRING_LEN, stats[i].stat_string, args);
 200                 *p += ETH_GSTRING_LEN;
 201                 va_end(args);
 202         }
 203 }
 204 
 205 /**
 206  * iavf_add_stat_strings - copy stat strings into ethtool buffer
 207  * @p: ethtool supplied buffer
 208  * @stats: stat definitions array
 209  *
 210  * Format and copy the strings described by the const static stats value into
 211  * the buffer pointed at by p.
 212  *
 213  * The parameter @stats is evaluated twice, so parameters with side effects
 214  * should be avoided. Additionally, stats must be an array such that
 215  * ARRAY_SIZE can be called on it.
 216  **/
 217 #define iavf_add_stat_strings(p, stats, ...) \
 218         __iavf_add_stat_strings(p, stats, ARRAY_SIZE(stats), ## __VA_ARGS__)
 219 
 220 #define VF_STAT(_name, _stat) \
 221         IAVF_STAT(struct iavf_adapter, _name, _stat)
 222 
 223 static const struct iavf_stats iavf_gstrings_stats[] = {
 224         VF_STAT("rx_bytes", current_stats.rx_bytes),
 225         VF_STAT("rx_unicast", current_stats.rx_unicast),
 226         VF_STAT("rx_multicast", current_stats.rx_multicast),
 227         VF_STAT("rx_broadcast", current_stats.rx_broadcast),
 228         VF_STAT("rx_discards", current_stats.rx_discards),
 229         VF_STAT("rx_unknown_protocol", current_stats.rx_unknown_protocol),
 230         VF_STAT("tx_bytes", current_stats.tx_bytes),
 231         VF_STAT("tx_unicast", current_stats.tx_unicast),
 232         VF_STAT("tx_multicast", current_stats.tx_multicast),
 233         VF_STAT("tx_broadcast", current_stats.tx_broadcast),
 234         VF_STAT("tx_discards", current_stats.tx_discards),
 235         VF_STAT("tx_errors", current_stats.tx_errors),
 236 };
 237 
 238 #define IAVF_STATS_LEN  ARRAY_SIZE(iavf_gstrings_stats)
 239 
 240 #define IAVF_QUEUE_STATS_LEN    ARRAY_SIZE(iavf_gstrings_queue_stats)
 241 
 242 /* For now we have one and only one private flag and it is only defined
 243  * when we have support for the SKIP_CPU_SYNC DMA attribute.  Instead
 244  * of leaving all this code sitting around empty we will strip it unless
 245  * our one private flag is actually available.
 246  */
 247 struct iavf_priv_flags {
 248         char flag_string[ETH_GSTRING_LEN];
 249         u32 flag;
 250         bool read_only;
 251 };
 252 
 253 #define IAVF_PRIV_FLAG(_name, _flag, _read_only) { \
 254         .flag_string = _name, \
 255         .flag = _flag, \
 256         .read_only = _read_only, \
 257 }
 258 
 259 static const struct iavf_priv_flags iavf_gstrings_priv_flags[] = {
 260         IAVF_PRIV_FLAG("legacy-rx", IAVF_FLAG_LEGACY_RX, 0),
 261 };
 262 
 263 #define IAVF_PRIV_FLAGS_STR_LEN ARRAY_SIZE(iavf_gstrings_priv_flags)
 264 
 265 /**
 266  * iavf_get_link_ksettings - Get Link Speed and Duplex settings
 267  * @netdev: network interface device structure
 268  * @cmd: ethtool command
 269  *
 270  * Reports speed/duplex settings. Because this is a VF, we don't know what
 271  * kind of link we really have, so we fake it.
 272  **/
 273 static int iavf_get_link_ksettings(struct net_device *netdev,
 274                                    struct ethtool_link_ksettings *cmd)
 275 {
 276         struct iavf_adapter *adapter = netdev_priv(netdev);
 277 
 278         ethtool_link_ksettings_zero_link_mode(cmd, supported);
 279         cmd->base.autoneg = AUTONEG_DISABLE;
 280         cmd->base.port = PORT_NONE;
 281         /* Set speed and duplex */
 282         switch (adapter->link_speed) {
 283         case IAVF_LINK_SPEED_40GB:
 284                 cmd->base.speed = SPEED_40000;
 285                 break;
 286         case IAVF_LINK_SPEED_25GB:
 287 #ifdef SPEED_25000
 288                 cmd->base.speed = SPEED_25000;
 289 #else
 290                 netdev_info(netdev,
 291                             "Speed is 25G, display not supported by this version of ethtool.\n");
 292 #endif
 293                 break;
 294         case IAVF_LINK_SPEED_20GB:
 295                 cmd->base.speed = SPEED_20000;
 296                 break;
 297         case IAVF_LINK_SPEED_10GB:
 298                 cmd->base.speed = SPEED_10000;
 299                 break;
 300         case IAVF_LINK_SPEED_1GB:
 301                 cmd->base.speed = SPEED_1000;
 302                 break;
 303         case IAVF_LINK_SPEED_100MB:
 304                 cmd->base.speed = SPEED_100;
 305                 break;
 306         default:
 307                 break;
 308         }
 309         cmd->base.duplex = DUPLEX_FULL;
 310 
 311         return 0;
 312 }
 313 
 314 /**
 315  * iavf_get_sset_count - Get length of string set
 316  * @netdev: network interface device structure
 317  * @sset: id of string set
 318  *
 319  * Reports size of various string tables.
 320  **/
 321 static int iavf_get_sset_count(struct net_device *netdev, int sset)
 322 {
 323         if (sset == ETH_SS_STATS)
 324                 return IAVF_STATS_LEN +
 325                         (IAVF_QUEUE_STATS_LEN * 2 * IAVF_MAX_REQ_QUEUES);
 326         else if (sset == ETH_SS_PRIV_FLAGS)
 327                 return IAVF_PRIV_FLAGS_STR_LEN;
 328         else
 329                 return -EINVAL;
 330 }
 331 
 332 /**
 333  * iavf_get_ethtool_stats - report device statistics
 334  * @netdev: network interface device structure
 335  * @stats: ethtool statistics structure
 336  * @data: pointer to data buffer
 337  *
 338  * All statistics are added to the data buffer as an array of u64.
 339  **/
 340 static void iavf_get_ethtool_stats(struct net_device *netdev,
 341                                    struct ethtool_stats *stats, u64 *data)
 342 {
 343         struct iavf_adapter *adapter = netdev_priv(netdev);
 344         unsigned int i;
 345 
 346         iavf_add_ethtool_stats(&data, adapter, iavf_gstrings_stats);
 347 
 348         rcu_read_lock();
 349         for (i = 0; i < IAVF_MAX_REQ_QUEUES; i++) {
 350                 struct iavf_ring *ring;
 351 
 352                 /* Avoid accessing un-allocated queues */
 353                 ring = (i < adapter->num_active_queues ?
 354                         &adapter->tx_rings[i] : NULL);
 355                 iavf_add_queue_stats(&data, ring);
 356 
 357                 /* Avoid accessing un-allocated queues */
 358                 ring = (i < adapter->num_active_queues ?
 359                         &adapter->rx_rings[i] : NULL);
 360                 iavf_add_queue_stats(&data, ring);
 361         }
 362         rcu_read_unlock();
 363 }
 364 
 365 /**
 366  * iavf_get_priv_flag_strings - Get private flag strings
 367  * @netdev: network interface device structure
 368  * @data: buffer for string data
 369  *
 370  * Builds the private flags string table
 371  **/
 372 static void iavf_get_priv_flag_strings(struct net_device *netdev, u8 *data)
 373 {
 374         unsigned int i;
 375 
 376         for (i = 0; i < IAVF_PRIV_FLAGS_STR_LEN; i++) {
 377                 snprintf(data, ETH_GSTRING_LEN, "%s",
 378                          iavf_gstrings_priv_flags[i].flag_string);
 379                 data += ETH_GSTRING_LEN;
 380         }
 381 }
 382 
 383 /**
 384  * iavf_get_stat_strings - Get stat strings
 385  * @netdev: network interface device structure
 386  * @data: buffer for string data
 387  *
 388  * Builds the statistics string table
 389  **/
 390 static void iavf_get_stat_strings(struct net_device *netdev, u8 *data)
 391 {
 392         unsigned int i;
 393 
 394         iavf_add_stat_strings(&data, iavf_gstrings_stats);
 395 
 396         /* Queues are always allocated in pairs, so we just use num_tx_queues
 397          * for both Tx and Rx queues.
 398          */
 399         for (i = 0; i < netdev->num_tx_queues; i++) {
 400                 iavf_add_stat_strings(&data, iavf_gstrings_queue_stats,
 401                                       "tx", i);
 402                 iavf_add_stat_strings(&data, iavf_gstrings_queue_stats,
 403                                       "rx", i);
 404         }
 405 }
 406 
 407 /**
 408  * iavf_get_strings - Get string set
 409  * @netdev: network interface device structure
 410  * @sset: id of string set
 411  * @data: buffer for string data
 412  *
 413  * Builds string tables for various string sets
 414  **/
 415 static void iavf_get_strings(struct net_device *netdev, u32 sset, u8 *data)
 416 {
 417         switch (sset) {
 418         case ETH_SS_STATS:
 419                 iavf_get_stat_strings(netdev, data);
 420                 break;
 421         case ETH_SS_PRIV_FLAGS:
 422                 iavf_get_priv_flag_strings(netdev, data);
 423                 break;
 424         default:
 425                 break;
 426         }
 427 }
 428 
 429 /**
 430  * iavf_get_priv_flags - report device private flags
 431  * @netdev: network interface device structure
 432  *
 433  * The get string set count and the string set should be matched for each
 434  * flag returned.  Add new strings for each flag to the iavf_gstrings_priv_flags
 435  * array.
 436  *
 437  * Returns a u32 bitmap of flags.
 438  **/
 439 static u32 iavf_get_priv_flags(struct net_device *netdev)
 440 {
 441         struct iavf_adapter *adapter = netdev_priv(netdev);
 442         u32 i, ret_flags = 0;
 443 
 444         for (i = 0; i < IAVF_PRIV_FLAGS_STR_LEN; i++) {
 445                 const struct iavf_priv_flags *priv_flags;
 446 
 447                 priv_flags = &iavf_gstrings_priv_flags[i];
 448 
 449                 if (priv_flags->flag & adapter->flags)
 450                         ret_flags |= BIT(i);
 451         }
 452 
 453         return ret_flags;
 454 }
 455 
 456 /**
 457  * iavf_set_priv_flags - set private flags
 458  * @netdev: network interface device structure
 459  * @flags: bit flags to be set
 460  **/
 461 static int iavf_set_priv_flags(struct net_device *netdev, u32 flags)
 462 {
 463         struct iavf_adapter *adapter = netdev_priv(netdev);
 464         u32 orig_flags, new_flags, changed_flags;
 465         u32 i;
 466 
 467         orig_flags = READ_ONCE(adapter->flags);
 468         new_flags = orig_flags;
 469 
 470         for (i = 0; i < IAVF_PRIV_FLAGS_STR_LEN; i++) {
 471                 const struct iavf_priv_flags *priv_flags;
 472 
 473                 priv_flags = &iavf_gstrings_priv_flags[i];
 474 
 475                 if (flags & BIT(i))
 476                         new_flags |= priv_flags->flag;
 477                 else
 478                         new_flags &= ~(priv_flags->flag);
 479 
 480                 if (priv_flags->read_only &&
 481                     ((orig_flags ^ new_flags) & ~BIT(i)))
 482                         return -EOPNOTSUPP;
 483         }
 484 
 485         /* Before we finalize any flag changes, any checks which we need to
 486          * perform to determine if the new flags will be supported should go
 487          * here...
 488          */
 489 
 490         /* Compare and exchange the new flags into place. If we failed, that
 491          * is if cmpxchg returns anything but the old value, this means
 492          * something else must have modified the flags variable since we
 493          * copied it. We'll just punt with an error and log something in the
 494          * message buffer.
 495          */
 496         if (cmpxchg(&adapter->flags, orig_flags, new_flags) != orig_flags) {
 497                 dev_warn(&adapter->pdev->dev,
 498                          "Unable to update adapter->flags as it was modified by another thread...\n");
 499                 return -EAGAIN;
 500         }
 501 
 502         changed_flags = orig_flags ^ new_flags;
 503 
 504         /* Process any additional changes needed as a result of flag changes.
 505          * The changed_flags value reflects the list of bits that were changed
 506          * in the code above.
 507          */
 508 
 509         /* issue a reset to force legacy-rx change to take effect */
 510         if (changed_flags & IAVF_FLAG_LEGACY_RX) {
 511                 if (netif_running(netdev)) {
 512                         adapter->flags |= IAVF_FLAG_RESET_NEEDED;
 513                         queue_work(iavf_wq, &adapter->reset_task);
 514                 }
 515         }
 516 
 517         return 0;
 518 }
 519 
 520 /**
 521  * iavf_get_msglevel - Get debug message level
 522  * @netdev: network interface device structure
 523  *
 524  * Returns current debug message level.
 525  **/
 526 static u32 iavf_get_msglevel(struct net_device *netdev)
 527 {
 528         struct iavf_adapter *adapter = netdev_priv(netdev);
 529 
 530         return adapter->msg_enable;
 531 }
 532 
 533 /**
 534  * iavf_set_msglevel - Set debug message level
 535  * @netdev: network interface device structure
 536  * @data: message level
 537  *
 538  * Set current debug message level. Higher values cause the driver to
 539  * be noisier.
 540  **/
 541 static void iavf_set_msglevel(struct net_device *netdev, u32 data)
 542 {
 543         struct iavf_adapter *adapter = netdev_priv(netdev);
 544 
 545         if (IAVF_DEBUG_USER & data)
 546                 adapter->hw.debug_mask = data;
 547         adapter->msg_enable = data;
 548 }
 549 
 550 /**
 551  * iavf_get_drvinfo - Get driver info
 552  * @netdev: network interface device structure
 553  * @drvinfo: ethool driver info structure
 554  *
 555  * Returns information about the driver and device for display to the user.
 556  **/
 557 static void iavf_get_drvinfo(struct net_device *netdev,
 558                              struct ethtool_drvinfo *drvinfo)
 559 {
 560         struct iavf_adapter *adapter = netdev_priv(netdev);
 561 
 562         strlcpy(drvinfo->driver, iavf_driver_name, 32);
 563         strlcpy(drvinfo->version, iavf_driver_version, 32);
 564         strlcpy(drvinfo->fw_version, "N/A", 4);
 565         strlcpy(drvinfo->bus_info, pci_name(adapter->pdev), 32);
 566         drvinfo->n_priv_flags = IAVF_PRIV_FLAGS_STR_LEN;
 567 }
 568 
 569 /**
 570  * iavf_get_ringparam - Get ring parameters
 571  * @netdev: network interface device structure
 572  * @ring: ethtool ringparam structure
 573  *
 574  * Returns current ring parameters. TX and RX rings are reported separately,
 575  * but the number of rings is not reported.
 576  **/
 577 static void iavf_get_ringparam(struct net_device *netdev,
 578                                struct ethtool_ringparam *ring)
 579 {
 580         struct iavf_adapter *adapter = netdev_priv(netdev);
 581 
 582         ring->rx_max_pending = IAVF_MAX_RXD;
 583         ring->tx_max_pending = IAVF_MAX_TXD;
 584         ring->rx_pending = adapter->rx_desc_count;
 585         ring->tx_pending = adapter->tx_desc_count;
 586 }
 587 
 588 /**
 589  * iavf_set_ringparam - Set ring parameters
 590  * @netdev: network interface device structure
 591  * @ring: ethtool ringparam structure
 592  *
 593  * Sets ring parameters. TX and RX rings are controlled separately, but the
 594  * number of rings is not specified, so all rings get the same settings.
 595  **/
 596 static int iavf_set_ringparam(struct net_device *netdev,
 597                               struct ethtool_ringparam *ring)
 598 {
 599         struct iavf_adapter *adapter = netdev_priv(netdev);
 600         u32 new_rx_count, new_tx_count;
 601 
 602         if ((ring->rx_mini_pending) || (ring->rx_jumbo_pending))
 603                 return -EINVAL;
 604 
 605         new_tx_count = clamp_t(u32, ring->tx_pending,
 606                                IAVF_MIN_TXD,
 607                                IAVF_MAX_TXD);
 608         new_tx_count = ALIGN(new_tx_count, IAVF_REQ_DESCRIPTOR_MULTIPLE);
 609 
 610         new_rx_count = clamp_t(u32, ring->rx_pending,
 611                                IAVF_MIN_RXD,
 612                                IAVF_MAX_RXD);
 613         new_rx_count = ALIGN(new_rx_count, IAVF_REQ_DESCRIPTOR_MULTIPLE);
 614 
 615         /* if nothing to do return success */
 616         if ((new_tx_count == adapter->tx_desc_count) &&
 617             (new_rx_count == adapter->rx_desc_count))
 618                 return 0;
 619 
 620         adapter->tx_desc_count = new_tx_count;
 621         adapter->rx_desc_count = new_rx_count;
 622 
 623         if (netif_running(netdev)) {
 624                 adapter->flags |= IAVF_FLAG_RESET_NEEDED;
 625                 queue_work(iavf_wq, &adapter->reset_task);
 626         }
 627 
 628         return 0;
 629 }
 630 
 631 /**
 632  * __iavf_get_coalesce - get per-queue coalesce settings
 633  * @netdev: the netdev to check
 634  * @ec: ethtool coalesce data structure
 635  * @queue: which queue to pick
 636  *
 637  * Gets the per-queue settings for coalescence. Specifically Rx and Tx usecs
 638  * are per queue. If queue is <0 then we default to queue 0 as the
 639  * representative value.
 640  **/
 641 static int __iavf_get_coalesce(struct net_device *netdev,
 642                                struct ethtool_coalesce *ec, int queue)
 643 {
 644         struct iavf_adapter *adapter = netdev_priv(netdev);
 645         struct iavf_vsi *vsi = &adapter->vsi;
 646         struct iavf_ring *rx_ring, *tx_ring;
 647 
 648         ec->tx_max_coalesced_frames = vsi->work_limit;
 649         ec->rx_max_coalesced_frames = vsi->work_limit;
 650 
 651         /* Rx and Tx usecs per queue value. If user doesn't specify the
 652          * queue, return queue 0's value to represent.
 653          */
 654         if (queue < 0)
 655                 queue = 0;
 656         else if (queue >= adapter->num_active_queues)
 657                 return -EINVAL;
 658 
 659         rx_ring = &adapter->rx_rings[queue];
 660         tx_ring = &adapter->tx_rings[queue];
 661 
 662         if (ITR_IS_DYNAMIC(rx_ring->itr_setting))
 663                 ec->use_adaptive_rx_coalesce = 1;
 664 
 665         if (ITR_IS_DYNAMIC(tx_ring->itr_setting))
 666                 ec->use_adaptive_tx_coalesce = 1;
 667 
 668         ec->rx_coalesce_usecs = rx_ring->itr_setting & ~IAVF_ITR_DYNAMIC;
 669         ec->tx_coalesce_usecs = tx_ring->itr_setting & ~IAVF_ITR_DYNAMIC;
 670 
 671         return 0;
 672 }
 673 
 674 /**
 675  * iavf_get_coalesce - Get interrupt coalescing settings
 676  * @netdev: network interface device structure
 677  * @ec: ethtool coalesce structure
 678  *
 679  * Returns current coalescing settings. This is referred to elsewhere in the
 680  * driver as Interrupt Throttle Rate, as this is how the hardware describes
 681  * this functionality. Note that if per-queue settings have been modified this
 682  * only represents the settings of queue 0.
 683  **/
 684 static int iavf_get_coalesce(struct net_device *netdev,
 685                              struct ethtool_coalesce *ec)
 686 {
 687         return __iavf_get_coalesce(netdev, ec, -1);
 688 }
 689 
 690 /**
 691  * iavf_get_per_queue_coalesce - get coalesce values for specific queue
 692  * @netdev: netdev to read
 693  * @ec: coalesce settings from ethtool
 694  * @queue: the queue to read
 695  *
 696  * Read specific queue's coalesce settings.
 697  **/
 698 static int iavf_get_per_queue_coalesce(struct net_device *netdev, u32 queue,
 699                                        struct ethtool_coalesce *ec)
 700 {
 701         return __iavf_get_coalesce(netdev, ec, queue);
 702 }
 703 
 704 /**
 705  * iavf_set_itr_per_queue - set ITR values for specific queue
 706  * @adapter: the VF adapter struct to set values for
 707  * @ec: coalesce settings from ethtool
 708  * @queue: the queue to modify
 709  *
 710  * Change the ITR settings for a specific queue.
 711  **/
 712 static void iavf_set_itr_per_queue(struct iavf_adapter *adapter,
 713                                    struct ethtool_coalesce *ec, int queue)
 714 {
 715         struct iavf_ring *rx_ring = &adapter->rx_rings[queue];
 716         struct iavf_ring *tx_ring = &adapter->tx_rings[queue];
 717         struct iavf_q_vector *q_vector;
 718 
 719         rx_ring->itr_setting = ITR_REG_ALIGN(ec->rx_coalesce_usecs);
 720         tx_ring->itr_setting = ITR_REG_ALIGN(ec->tx_coalesce_usecs);
 721 
 722         rx_ring->itr_setting |= IAVF_ITR_DYNAMIC;
 723         if (!ec->use_adaptive_rx_coalesce)
 724                 rx_ring->itr_setting ^= IAVF_ITR_DYNAMIC;
 725 
 726         tx_ring->itr_setting |= IAVF_ITR_DYNAMIC;
 727         if (!ec->use_adaptive_tx_coalesce)
 728                 tx_ring->itr_setting ^= IAVF_ITR_DYNAMIC;
 729 
 730         q_vector = rx_ring->q_vector;
 731         q_vector->rx.target_itr = ITR_TO_REG(rx_ring->itr_setting);
 732 
 733         q_vector = tx_ring->q_vector;
 734         q_vector->tx.target_itr = ITR_TO_REG(tx_ring->itr_setting);
 735 
 736         /* The interrupt handler itself will take care of programming
 737          * the Tx and Rx ITR values based on the values we have entered
 738          * into the q_vector, no need to write the values now.
 739          */
 740 }
 741 
 742 /**
 743  * __iavf_set_coalesce - set coalesce settings for particular queue
 744  * @netdev: the netdev to change
 745  * @ec: ethtool coalesce settings
 746  * @queue: the queue to change
 747  *
 748  * Sets the coalesce settings for a particular queue.
 749  **/
 750 static int __iavf_set_coalesce(struct net_device *netdev,
 751                                struct ethtool_coalesce *ec, int queue)
 752 {
 753         struct iavf_adapter *adapter = netdev_priv(netdev);
 754         struct iavf_vsi *vsi = &adapter->vsi;
 755         int i;
 756 
 757         if (ec->tx_max_coalesced_frames_irq || ec->rx_max_coalesced_frames_irq)
 758                 vsi->work_limit = ec->tx_max_coalesced_frames_irq;
 759 
 760         if (ec->rx_coalesce_usecs == 0) {
 761                 if (ec->use_adaptive_rx_coalesce)
 762                         netif_info(adapter, drv, netdev, "rx-usecs=0, need to disable adaptive-rx for a complete disable\n");
 763         } else if ((ec->rx_coalesce_usecs < IAVF_MIN_ITR) ||
 764                    (ec->rx_coalesce_usecs > IAVF_MAX_ITR)) {
 765                 netif_info(adapter, drv, netdev, "Invalid value, rx-usecs range is 0-8160\n");
 766                 return -EINVAL;
 767         } else if (ec->tx_coalesce_usecs == 0) {
 768                 if (ec->use_adaptive_tx_coalesce)
 769                         netif_info(adapter, drv, netdev, "tx-usecs=0, need to disable adaptive-tx for a complete disable\n");
 770         } else if ((ec->tx_coalesce_usecs < IAVF_MIN_ITR) ||
 771                    (ec->tx_coalesce_usecs > IAVF_MAX_ITR)) {
 772                 netif_info(adapter, drv, netdev, "Invalid value, tx-usecs range is 0-8160\n");
 773                 return -EINVAL;
 774         }
 775 
 776         /* Rx and Tx usecs has per queue value. If user doesn't specify the
 777          * queue, apply to all queues.
 778          */
 779         if (queue < 0) {
 780                 for (i = 0; i < adapter->num_active_queues; i++)
 781                         iavf_set_itr_per_queue(adapter, ec, i);
 782         } else if (queue < adapter->num_active_queues) {
 783                 iavf_set_itr_per_queue(adapter, ec, queue);
 784         } else {
 785                 netif_info(adapter, drv, netdev, "Invalid queue value, queue range is 0 - %d\n",
 786                            adapter->num_active_queues - 1);
 787                 return -EINVAL;
 788         }
 789 
 790         return 0;
 791 }
 792 
 793 /**
 794  * iavf_set_coalesce - Set interrupt coalescing settings
 795  * @netdev: network interface device structure
 796  * @ec: ethtool coalesce structure
 797  *
 798  * Change current coalescing settings for every queue.
 799  **/
 800 static int iavf_set_coalesce(struct net_device *netdev,
 801                              struct ethtool_coalesce *ec)
 802 {
 803         return __iavf_set_coalesce(netdev, ec, -1);
 804 }
 805 
 806 /**
 807  * iavf_set_per_queue_coalesce - set specific queue's coalesce settings
 808  * @netdev: the netdev to change
 809  * @ec: ethtool's coalesce settings
 810  * @queue: the queue to modify
 811  *
 812  * Modifies a specific queue's coalesce settings.
 813  */
 814 static int iavf_set_per_queue_coalesce(struct net_device *netdev, u32 queue,
 815                                        struct ethtool_coalesce *ec)
 816 {
 817         return __iavf_set_coalesce(netdev, ec, queue);
 818 }
 819 
 820 /**
 821  * iavf_get_rxnfc - command to get RX flow classification rules
 822  * @netdev: network interface device structure
 823  * @cmd: ethtool rxnfc command
 824  * @rule_locs: pointer to store rule locations
 825  *
 826  * Returns Success if the command is supported.
 827  **/
 828 static int iavf_get_rxnfc(struct net_device *netdev, struct ethtool_rxnfc *cmd,
 829                           u32 *rule_locs)
 830 {
 831         struct iavf_adapter *adapter = netdev_priv(netdev);
 832         int ret = -EOPNOTSUPP;
 833 
 834         switch (cmd->cmd) {
 835         case ETHTOOL_GRXRINGS:
 836                 cmd->data = adapter->num_active_queues;
 837                 ret = 0;
 838                 break;
 839         case ETHTOOL_GRXFH:
 840                 netdev_info(netdev,
 841                             "RSS hash info is not available to vf, use pf.\n");
 842                 break;
 843         default:
 844                 break;
 845         }
 846 
 847         return ret;
 848 }
 849 /**
 850  * iavf_get_channels: get the number of channels supported by the device
 851  * @netdev: network interface device structure
 852  * @ch: channel information structure
 853  *
 854  * For the purposes of our device, we only use combined channels, i.e. a tx/rx
 855  * queue pair. Report one extra channel to match our "other" MSI-X vector.
 856  **/
 857 static void iavf_get_channels(struct net_device *netdev,
 858                               struct ethtool_channels *ch)
 859 {
 860         struct iavf_adapter *adapter = netdev_priv(netdev);
 861 
 862         /* Report maximum channels */
 863         ch->max_combined = IAVF_MAX_REQ_QUEUES;
 864 
 865         ch->max_other = NONQ_VECS;
 866         ch->other_count = NONQ_VECS;
 867 
 868         ch->combined_count = adapter->num_active_queues;
 869 }
 870 
 871 /**
 872  * iavf_set_channels: set the new channel count
 873  * @netdev: network interface device structure
 874  * @ch: channel information structure
 875  *
 876  * Negotiate a new number of channels with the PF then do a reset.  During
 877  * reset we'll realloc queues and fix the RSS table.  Returns 0 on success,
 878  * negative on failure.
 879  **/
 880 static int iavf_set_channels(struct net_device *netdev,
 881                              struct ethtool_channels *ch)
 882 {
 883         struct iavf_adapter *adapter = netdev_priv(netdev);
 884         int num_req = ch->combined_count;
 885 
 886         if (num_req != adapter->num_active_queues &&
 887             !(adapter->vf_res->vf_cap_flags &
 888               VIRTCHNL_VF_OFFLOAD_REQ_QUEUES)) {
 889                 dev_info(&adapter->pdev->dev, "PF is not capable of queue negotiation.\n");
 890                 return -EINVAL;
 891         }
 892 
 893         if ((adapter->vf_res->vf_cap_flags & VIRTCHNL_VF_OFFLOAD_ADQ) &&
 894             adapter->num_tc) {
 895                 dev_info(&adapter->pdev->dev, "Cannot set channels since ADq is enabled.\n");
 896                 return -EINVAL;
 897         }
 898 
 899         /* All of these should have already been checked by ethtool before this
 900          * even gets to us, but just to be sure.
 901          */
 902         if (num_req <= 0 || num_req > IAVF_MAX_REQ_QUEUES)
 903                 return -EINVAL;
 904 
 905         if (ch->rx_count || ch->tx_count || ch->other_count != NONQ_VECS)
 906                 return -EINVAL;
 907 
 908         adapter->num_req_queues = num_req;
 909         return iavf_request_queues(adapter, num_req);
 910 }
 911 
 912 /**
 913  * iavf_get_rxfh_key_size - get the RSS hash key size
 914  * @netdev: network interface device structure
 915  *
 916  * Returns the table size.
 917  **/
 918 static u32 iavf_get_rxfh_key_size(struct net_device *netdev)
 919 {
 920         struct iavf_adapter *adapter = netdev_priv(netdev);
 921 
 922         return adapter->rss_key_size;
 923 }
 924 
 925 /**
 926  * iavf_get_rxfh_indir_size - get the rx flow hash indirection table size
 927  * @netdev: network interface device structure
 928  *
 929  * Returns the table size.
 930  **/
 931 static u32 iavf_get_rxfh_indir_size(struct net_device *netdev)
 932 {
 933         struct iavf_adapter *adapter = netdev_priv(netdev);
 934 
 935         return adapter->rss_lut_size;
 936 }
 937 
 938 /**
 939  * iavf_get_rxfh - get the rx flow hash indirection table
 940  * @netdev: network interface device structure
 941  * @indir: indirection table
 942  * @key: hash key
 943  * @hfunc: hash function in use
 944  *
 945  * Reads the indirection table directly from the hardware. Always returns 0.
 946  **/
 947 static int iavf_get_rxfh(struct net_device *netdev, u32 *indir, u8 *key,
 948                          u8 *hfunc)
 949 {
 950         struct iavf_adapter *adapter = netdev_priv(netdev);
 951         u16 i;
 952 
 953         if (hfunc)
 954                 *hfunc = ETH_RSS_HASH_TOP;
 955         if (!indir)
 956                 return 0;
 957 
 958         memcpy(key, adapter->rss_key, adapter->rss_key_size);
 959 
 960         /* Each 32 bits pointed by 'indir' is stored with a lut entry */
 961         for (i = 0; i < adapter->rss_lut_size; i++)
 962                 indir[i] = (u32)adapter->rss_lut[i];
 963 
 964         return 0;
 965 }
 966 
 967 /**
 968  * iavf_set_rxfh - set the rx flow hash indirection table
 969  * @netdev: network interface device structure
 970  * @indir: indirection table
 971  * @key: hash key
 972  * @hfunc: hash function to use
 973  *
 974  * Returns -EINVAL if the table specifies an inavlid queue id, otherwise
 975  * returns 0 after programming the table.
 976  **/
 977 static int iavf_set_rxfh(struct net_device *netdev, const u32 *indir,
 978                          const u8 *key, const u8 hfunc)
 979 {
 980         struct iavf_adapter *adapter = netdev_priv(netdev);
 981         u16 i;
 982 
 983         /* We do not allow change in unsupported parameters */
 984         if (key ||
 985             (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP))
 986                 return -EOPNOTSUPP;
 987         if (!indir)
 988                 return 0;
 989 
 990         if (key)
 991                 memcpy(adapter->rss_key, key, adapter->rss_key_size);
 992 
 993         /* Each 32 bits pointed by 'indir' is stored with a lut entry */
 994         for (i = 0; i < adapter->rss_lut_size; i++)
 995                 adapter->rss_lut[i] = (u8)(indir[i]);
 996 
 997         return iavf_config_rss(adapter);
 998 }
 999 
1000 static const struct ethtool_ops iavf_ethtool_ops = {
1001         .get_drvinfo            = iavf_get_drvinfo,
1002         .get_link               = ethtool_op_get_link,
1003         .get_ringparam          = iavf_get_ringparam,
1004         .set_ringparam          = iavf_set_ringparam,
1005         .get_strings            = iavf_get_strings,
1006         .get_ethtool_stats      = iavf_get_ethtool_stats,
1007         .get_sset_count         = iavf_get_sset_count,
1008         .get_priv_flags         = iavf_get_priv_flags,
1009         .set_priv_flags         = iavf_set_priv_flags,
1010         .get_msglevel           = iavf_get_msglevel,
1011         .set_msglevel           = iavf_set_msglevel,
1012         .get_coalesce           = iavf_get_coalesce,
1013         .set_coalesce           = iavf_set_coalesce,
1014         .get_per_queue_coalesce = iavf_get_per_queue_coalesce,
1015         .set_per_queue_coalesce = iavf_set_per_queue_coalesce,
1016         .get_rxnfc              = iavf_get_rxnfc,
1017         .get_rxfh_indir_size    = iavf_get_rxfh_indir_size,
1018         .get_rxfh               = iavf_get_rxfh,
1019         .set_rxfh               = iavf_set_rxfh,
1020         .get_channels           = iavf_get_channels,
1021         .set_channels           = iavf_set_channels,
1022         .get_rxfh_key_size      = iavf_get_rxfh_key_size,
1023         .get_link_ksettings     = iavf_get_link_ksettings,
1024 };
1025 
1026 /**
1027  * iavf_set_ethtool_ops - Initialize ethtool ops struct
1028  * @netdev: network interface device structure
1029  *
1030  * Sets ethtool ops struct in our netdev so that ethtool can call
1031  * our functions.
1032  **/
1033 void iavf_set_ethtool_ops(struct net_device *netdev)
1034 {
1035         netdev->ethtool_ops = &iavf_ethtool_ops;
1036 }