drivers/net/sfc/net_driver.h

   1 /****************************************************************************
   2  * Driver for Solarflare Solarstorm network controllers and boards
   3  * Copyright 2005-2006 Fen Systems Ltd.
   4  * Copyright 2005-2008 Solarflare Communications Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 as published
   8  * by the Free Software Foundation, incorporated herein by reference.
   9  */
  10
  11 /* Common definitions for all Efx net driver code */
  12
  13 #ifndef EFX_NET_DRIVER_H
  14 #define EFX_NET_DRIVER_H
  15
  16 #include <linux/version.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/ethtool.h>
  20 #include <linux/if_vlan.h>
  21 #include <linux/timer.h>
  22 #include <linux/mii.h>
  23 #include <linux/list.h>
  24 #include <linux/pci.h>
  25 #include <linux/device.h>
  26 #include <linux/highmem.h>
  27 #include <linux/workqueue.h>
  28 #include <linux/inet_lro.h>
  29 #include <linux/i2c.h>
  30
  31 #include "enum.h"
  32 #include "bitfield.h"
  33
  34 #define EFX_MAX_LRO_DESCRIPTORS 8
  35 #define EFX_MAX_LRO_AGGR MAX_SKB_FRAGS
  36
  37 /**************************************************************************
  38  *
  39  * Build definitions
  40  *
  41  **************************************************************************/
  42 #ifndef EFX_DRIVER_NAME
  43 #define EFX_DRIVER_NAME "sfc"
  44 #endif
  45 #define EFX_DRIVER_VERSION      "2.2"
  46
  47 #ifdef EFX_ENABLE_DEBUG
  48 #define EFX_BUG_ON_PARANOID(x) BUG_ON(x)
  49 #define EFX_WARN_ON_PARANOID(x) WARN_ON(x)
  50 #else
  51 #define EFX_BUG_ON_PARANOID(x) do {} while (0)
  52 #define EFX_WARN_ON_PARANOID(x) do {} while (0)
  53 #endif
  54
  55 /* Un-rate-limited logging */
  56 #define EFX_ERR(efx, fmt, args...) \
  57 dev_err(&((efx)->pci_dev->dev), "ERR: %s " fmt, efx_dev_name(efx), ##args)
  58
  59 #define EFX_INFO(efx, fmt, args...) \
  60 dev_info(&((efx)->pci_dev->dev), "INFO: %s " fmt, efx_dev_name(efx), ##args)
  61
  62 #ifdef EFX_ENABLE_DEBUG
  63 #define EFX_LOG(efx, fmt, args...) \
  64 dev_info(&((efx)->pci_dev->dev), "DBG: %s " fmt, efx_dev_name(efx), ##args)
  65 #else
  66 #define EFX_LOG(efx, fmt, args...) \
  67 dev_dbg(&((efx)->pci_dev->dev), "DBG: %s " fmt, efx_dev_name(efx), ##args)
  68 #endif
  69
  70 #define EFX_TRACE(efx, fmt, args...) do {} while (0)
  71
  72 #define EFX_REGDUMP(efx, fmt, args...) do {} while (0)
  73
  74 /* Rate-limited logging */
  75 #define EFX_ERR_RL(efx, fmt, args...) \
  76 do {if (net_ratelimit()) EFX_ERR(efx, fmt, ##args); } while (0)
  77
  78 #define EFX_INFO_RL(efx, fmt, args...) \
  79 do {if (net_ratelimit()) EFX_INFO(efx, fmt, ##args); } while (0)
  80
  81 #define EFX_LOG_RL(efx, fmt, args...) \
  82 do {if (net_ratelimit()) EFX_LOG(efx, fmt, ##args); } while (0)
  83
  84 /**************************************************************************
  85  *
  86  * Efx data structures
  87  *
  88  **************************************************************************/
  89
  90 #define EFX_MAX_CHANNELS 32
  91 #define EFX_MAX_RX_QUEUES EFX_MAX_CHANNELS
  92
  93 #define EFX_TX_QUEUE_OFFLOAD_CSUM       0
  94 #define EFX_TX_QUEUE_NO_CSUM            1
  95 #define EFX_TX_QUEUE_COUNT              2
  96
  97 /**
  98  * struct efx_special_buffer - An Efx special buffer
  99  * @addr: CPU base address of the buffer
 100  * @dma_addr: DMA base address of the buffer
 101  * @len: Buffer length, in bytes
 102  * @index: Buffer index within controller;s buffer table
 103  * @entries: Number of buffer table entries
 104  *
 105  * Special buffers are used for the event queues and the TX and RX
 106  * descriptor queues for each channel.  They are *not* used for the
 107  * actual transmit and receive buffers.
 108  *
 109  * Note that for Falcon, TX and RX descriptor queues live in host memory.
 110  * Allocation and freeing procedures must take this into account.
 111  */
 112 struct efx_special_buffer {
 113         void *addr;
 114         dma_addr_t dma_addr;
 115         unsigned int len;
 116         int index;
 117         int entries;
 118 };
 119
 120 /**
 121  * struct efx_tx_buffer - An Efx TX buffer
 122  * @skb: The associated socket buffer.
 123  *      Set only on the final fragment of a packet; %NULL for all other
 124  *      fragments.  When this fragment completes, then we can free this
 125  *      skb.
 126  * @tsoh: The associated TSO header structure, or %NULL if this
 127  *      buffer is not a TSO header.
 128  * @dma_addr: DMA address of the fragment.
 129  * @len: Length of this fragment.
 130  *      This field is zero when the queue slot is empty.
 131  * @continuation: True if this fragment is not the end of a packet.
 132  * @unmap_single: True if pci_unmap_single should be used.
 133  * @unmap_len: Length of this fragment to unmap
 134  */
 135 struct efx_tx_buffer {
 136         const struct sk_buff *skb;
 137         struct efx_tso_header *tsoh;
 138         dma_addr_t dma_addr;
 139         unsigned short len;
 140         unsigned char continuation;
 141         unsigned char unmap_single;
 142         unsigned short unmap_len;
 143 };
 144
 145 /**
 146  * struct efx_tx_queue - An Efx TX queue
 147  *
 148  * This is a ring buffer of TX fragments.
 149  * Since the TX completion path always executes on the same
 150  * CPU and the xmit path can operate on different CPUs,
 151  * performance is increased by ensuring that the completion
 152  * path and the xmit path operate on different cache lines.
 153  * This is particularly important if the xmit path is always
 154  * executing on one CPU which is different from the completion
 155  * path.  There is also a cache line for members which are
 156  * read but not written on the fast path.
 157  *
 158  * @efx: The associated Efx NIC
 159  * @queue: DMA queue number
 160  * @channel: The associated channel
 161  * @buffer: The software buffer ring
 162  * @txd: The hardware descriptor ring
 163  * @read_count: Current read pointer.
 164  *      This is the number of buffers that have been removed from both rings.
 165  * @stopped: Stopped flag.
 166  *      Set if this TX queue is currently stopping its port.
 167  * @insert_count: Current insert pointer
 168  *      This is the number of buffers that have been added to the
 169  *      software ring.
 170  * @write_count: Current write pointer
 171  *      This is the number of buffers that have been added to the
 172  *      hardware ring.
 173  * @old_read_count: The value of read_count when last checked.
 174  *      This is here for performance reasons.  The xmit path will
 175  *      only get the up-to-date value of read_count if this
 176  *      variable indicates that the queue is full.  This is to
 177  *      avoid cache-line ping-pong between the xmit path and the
 178  *      completion path.
 179  * @tso_headers_free: A list of TSO headers allocated for this TX queue
 180  *      that are not in use, and so available for new TSO sends. The list
 181  *      is protected by the TX queue lock.
 182  * @tso_bursts: Number of times TSO xmit invoked by kernel
 183  * @tso_long_headers: Number of packets with headers too long for standard
 184  *      blocks
 185  * @tso_packets: Number of packets via the TSO xmit path
 186  */
 187 struct efx_tx_queue {
 188         /* Members which don't change on the fast path */
 189         struct efx_nic *efx ____cacheline_aligned_in_smp;
 190         int queue;
 191         struct efx_channel *channel;
 192         struct efx_nic *nic;
 193         struct efx_tx_buffer *buffer;
 194         struct efx_special_buffer txd;
 195
 196         /* Members used mainly on the completion path */
 197         unsigned int read_count ____cacheline_aligned_in_smp;
 198         int stopped;
 199
 200         /* Members used only on the xmit path */
 201         unsigned int insert_count ____cacheline_aligned_in_smp;
 202         unsigned int write_count;
 203         unsigned int old_read_count;
 204         struct efx_tso_header *tso_headers_free;
 205         unsigned int tso_bursts;
 206         unsigned int tso_long_headers;
 207         unsigned int tso_packets;
 208 };
 209
 210 /**
 211  * struct efx_rx_buffer - An Efx RX data buffer
 212  * @dma_addr: DMA base address of the buffer
 213  * @skb: The associated socket buffer, if any.
 214  *      If both this and page are %NULL, the buffer slot is currently free.
 215  * @page: The associated page buffer, if any.
 216  *      If both this and skb are %NULL, the buffer slot is currently free.
 217  * @data: Pointer to ethernet header
 218  * @len: Buffer length, in bytes.
 219  * @unmap_addr: DMA address to unmap
 220  */
 221 struct efx_rx_buffer {
 222         dma_addr_t dma_addr;
 223         struct sk_buff *skb;
 224         struct page *page;
 225         char *data;
 226         unsigned int len;
 227         dma_addr_t unmap_addr;
 228 };
 229
 230 /**
 231  * struct efx_rx_queue - An Efx RX queue
 232  * @efx: The associated Efx NIC
 233  * @queue: DMA queue number
 234  * @used: Queue is used by net driver
 235  * @channel: The associated channel
 236  * @buffer: The software buffer ring
 237  * @rxd: The hardware descriptor ring
 238  * @added_count: Number of buffers added to the receive queue.
 239  * @notified_count: Number of buffers given to NIC (<= @added_count).
 240  * @removed_count: Number of buffers removed from the receive queue.
 241  * @add_lock: Receive queue descriptor add spin lock.
 242  *      This lock must be held in order to add buffers to the RX
 243  *      descriptor ring (rxd and buffer) and to update added_count (but
 244  *      not removed_count).
 245  * @max_fill: RX descriptor maximum fill level (<= ring size)
 246  * @fast_fill_trigger: RX descriptor fill level that will trigger a fast fill
 247  *      (<= @max_fill)
 248  * @fast_fill_limit: The level to which a fast fill will fill
 249  *      (@fast_fill_trigger <= @fast_fill_limit <= @max_fill)
 250  * @min_fill: RX descriptor minimum non-zero fill level.
 251  *      This records the minimum fill level observed when a ring
 252  *      refill was triggered.
 253  * @min_overfill: RX descriptor minimum overflow fill level.
 254  *      This records the minimum fill level at which RX queue
 255  *      overflow was observed.  It should never be set.
 256  * @alloc_page_count: RX allocation strategy counter.
 257  * @alloc_skb_count: RX allocation strategy counter.
 258  * @work: Descriptor push work thread
 259  * @buf_page: Page for next RX buffer.
 260  *      We can use a single page for multiple RX buffers. This tracks
 261  *      the remaining space in the allocation.
 262  * @buf_dma_addr: Page's DMA address.
 263  * @buf_data: Page's host address.
 264  */
 265 struct efx_rx_queue {
 266         struct efx_nic *efx;
 267         int queue;
 268         int used;
 269         struct efx_channel *channel;
 270         struct efx_rx_buffer *buffer;
 271         struct efx_special_buffer rxd;
 272
 273         int added_count;
 274         int notified_count;
 275         int removed_count;
 276         spinlock_t add_lock;
 277         unsigned int max_fill;
 278         unsigned int fast_fill_trigger;
 279         unsigned int fast_fill_limit;
 280         unsigned int min_fill;
 281         unsigned int min_overfill;
 282         unsigned int alloc_page_count;
 283         unsigned int alloc_skb_count;
 284         struct delayed_work work;
 285         unsigned int slow_fill_count;
 286
 287         struct page *buf_page;
 288         dma_addr_t buf_dma_addr;
 289         char *buf_data;
 290 };
 291
 292 /**
 293  * struct efx_buffer - An Efx general-purpose buffer
 294  * @addr: host base address of the buffer
 295  * @dma_addr: DMA base address of the buffer
 296  * @len: Buffer length, in bytes
 297  *
 298  * Falcon uses these buffers for its interrupt status registers and
 299  * MAC stats dumps.
 300  */
 301 struct efx_buffer {
 302         void *addr;
 303         dma_addr_t dma_addr;
 304         unsigned int len;
 305 };
 306
 307
 308 /* Flags for channel->used_flags */
 309 #define EFX_USED_BY_RX 1
 310 #define EFX_USED_BY_TX 2
 311 #define EFX_USED_BY_RX_TX (EFX_USED_BY_RX | EFX_USED_BY_TX)
 312
 313 enum efx_rx_alloc_method {
 314         RX_ALLOC_METHOD_AUTO = 0,
 315         RX_ALLOC_METHOD_SKB = 1,
 316         RX_ALLOC_METHOD_PAGE = 2,
 317 };
 318
 319 /**
 320  * struct efx_channel - An Efx channel
 321  *
 322  * A channel comprises an event queue, at least one TX queue, at least
 323  * one RX queue, and an associated tasklet for processing the event
 324  * queue.
 325  *
 326  * @efx: Associated Efx NIC
 327  * @evqnum: Event queue number
 328  * @channel: Channel instance number
 329  * @used_flags: Channel is used by net driver
 330  * @enabled: Channel enabled indicator
 331  * @irq: IRQ number (MSI and MSI-X only)
 332  * @has_interrupt: Channel has an interrupt
 333  * @irq_moderation: IRQ moderation value (in us)
 334  * @napi_dev: Net device used with NAPI
 335  * @napi_str: NAPI control structure
 336  * @reset_work: Scheduled reset work thread
 337  * @work_pending: Is work pending via NAPI?
 338  * @eventq: Event queue buffer
 339  * @eventq_read_ptr: Event queue read pointer
 340  * @last_eventq_read_ptr: Last event queue read pointer value.
 341  * @eventq_magic: Event queue magic value for driver-generated test events
 342  * @lro_mgr: LRO state
 343  * @rx_alloc_level: Watermark based heuristic counter for pushing descriptors
 344  *      and diagnostic counters
 345  * @rx_alloc_push_pages: RX allocation method currently in use for pushing
 346  *      descriptors
 347  * @rx_alloc_pop_pages: RX allocation method currently in use for popping
 348  *      descriptors
 349  * @n_rx_tobe_disc: Count of RX_TOBE_DISC errors
 350  * @n_rx_ip_frag_err: Count of RX IP fragment errors
 351  * @n_rx_ip_hdr_chksum_err: Count of RX IP header checksum errors
 352  * @n_rx_tcp_udp_chksum_err: Count of RX TCP and UDP checksum errors
 353  * @n_rx_frm_trunc: Count of RX_FRM_TRUNC errors
 354  * @n_rx_overlength: Count of RX_OVERLENGTH errors
 355  * @n_skbuff_leaks: Count of skbuffs leaked due to RX overrun
 356  */
 357 struct efx_channel {
 358         struct efx_nic *efx;
 359         int evqnum;
 360         int channel;
 361         int used_flags;
 362         int enabled;
 363         int irq;
 364         unsigned int has_interrupt;
 365         unsigned int irq_moderation;
 366         struct net_device *napi_dev;
 367         struct napi_struct napi_str;
 368         int work_pending;
 369         struct efx_special_buffer eventq;
 370         unsigned int eventq_read_ptr;
 371         unsigned int last_eventq_read_ptr;
 372         unsigned int eventq_magic;
 373
 374         struct net_lro_mgr lro_mgr;
 375         int rx_alloc_level;
 376         int rx_alloc_push_pages;
 377         int rx_alloc_pop_pages;
 378
 379         unsigned n_rx_tobe_disc;
 380         unsigned n_rx_ip_frag_err;
 381         unsigned n_rx_ip_hdr_chksum_err;
 382         unsigned n_rx_tcp_udp_chksum_err;
 383         unsigned n_rx_frm_trunc;
 384         unsigned n_rx_overlength;
 385         unsigned n_skbuff_leaks;
 386
 387         /* Used to pipeline received packets in order to optimise memory
 388          * access with prefetches.
 389          */
 390         struct efx_rx_buffer *rx_pkt;
 391         int rx_pkt_csummed;
 392
 393 };
 394
 395 /**
 396  * struct efx_blinker - S/W LED blinking context
 397  * @led_num: LED ID (board-specific meaning)
 398  * @state: Current state - on or off
 399  * @resubmit: Timer resubmission flag
 400  * @timer: Control timer for blinking
 401  */
 402 struct efx_blinker {
 403         int led_num;
 404         int state;
 405         int resubmit;
 406         struct timer_list timer;
 407 };
 408
 409
 410 /**
 411  * struct efx_board - board information
 412  * @type: Board model type
 413  * @major: Major rev. ('A', 'B' ...)
 414  * @minor: Minor rev. (0, 1, ...)
 415  * @init: Initialisation function
 416  * @init_leds: Sets up board LEDs
 417  * @set_fault_led: Turns the fault LED on or off
 418  * @blink: Starts/stops blinking
 419  * @fini: Cleanup function
 420  * @blinker: used to blink LEDs in software
 421  * @hwmon_client: I2C client for hardware monitor
 422  * @ioexp_client: I2C client for power/port control
 423  */
 424 struct efx_board {
 425         int type;
 426         int major;
 427         int minor;
 428         int (*init) (struct efx_nic *nic);
 429         /* As the LEDs are typically attached to the PHY, LEDs
 430          * have a separate init callback that happens later than
 431          * board init. */
 432         int (*init_leds)(struct efx_nic *efx);
 433         void (*set_fault_led) (struct efx_nic *efx, int state);
 434         void (*blink) (struct efx_nic *efx, int start);
 435         void (*fini) (struct efx_nic *nic);
 436         struct efx_blinker blinker;
 437         struct i2c_client *hwmon_client, *ioexp_client;
 438 };
 439
 440 #define STRING_TABLE_LOOKUP(val, member)        \
 441         member ## _names[val]
 442
 443 enum efx_int_mode {
 444         /* Be careful if altering to correct macro below */
 445         EFX_INT_MODE_MSIX = 0,
 446         EFX_INT_MODE_MSI = 1,
 447         EFX_INT_MODE_LEGACY = 2,
 448         EFX_INT_MODE_MAX        /* Insert any new items before this */
 449 };
 450 #define EFX_INT_MODE_USE_MSI(x) (((x)->interrupt_mode) <= EFX_INT_MODE_MSI)
 451
 452 enum phy_type {
 453         PHY_TYPE_NONE = 0,
 454         PHY_TYPE_CX4_RTMR = 1,
 455         PHY_TYPE_1G_ALASKA = 2,
 456         PHY_TYPE_10XPRESS = 3,
 457         PHY_TYPE_XFP = 4,
 458         PHY_TYPE_PM8358 = 6,
 459         PHY_TYPE_MAX    /* Insert any new items before this */
 460 };
 461
 462 #define PHY_ADDR_INVALID 0xff
 463
 464 enum nic_state {
 465         STATE_INIT = 0,
 466         STATE_RUNNING = 1,
 467         STATE_FINI = 2,
 468         STATE_RESETTING = 3, /* rtnl_lock always held */
 469         STATE_DISABLED = 4,
 470         STATE_MAX,
 471 };
 472
 473 /*
 474  * Alignment of page-allocated RX buffers
 475  *
 476  * Controls the number of bytes inserted at the start of an RX buffer.
 477  * This is the equivalent of NET_IP_ALIGN [which controls the alignment
 478  * of the skb->head for hardware DMA].
 479  */
 480 #if defined(__i386__) || defined(__x86_64__)
 481 #define EFX_PAGE_IP_ALIGN 0
 482 #else
 483 #define EFX_PAGE_IP_ALIGN NET_IP_ALIGN
 484 #endif
 485
 486 /*
 487  * Alignment of the skb->head which wraps a page-allocated RX buffer
 488  *
 489  * The skb allocated to wrap an rx_buffer can have this alignment. Since
 490  * the data is memcpy'd from the rx_buf, it does not need to be equal to
 491  * EFX_PAGE_IP_ALIGN.
 492  */
 493 #define EFX_PAGE_SKB_ALIGN 2
 494
 495 /* Forward declaration */
 496 struct efx_nic;
 497
 498 /* Pseudo bit-mask flow control field */
 499 enum efx_fc_type {
 500         EFX_FC_RX = 1,
 501         EFX_FC_TX = 2,
 502         EFX_FC_AUTO = 4,
 503 };
 504
 505 /**
 506  * struct efx_phy_operations - Efx PHY operations table
 507  * @init: Initialise PHY
 508  * @fini: Shut down PHY
 509  * @reconfigure: Reconfigure PHY (e.g. for new link parameters)
 510  * @clear_interrupt: Clear down interrupt
 511  * @blink: Blink LEDs
 512  * @check_hw: Check hardware
 513  * @reset_xaui: Reset XAUI side of PHY for (software sequenced reset)
 514  * @mmds: MMD presence mask
 515  * @loopbacks: Supported loopback modes mask
 516  */
 517 struct efx_phy_operations {
 518         int (*init) (struct efx_nic *efx);
 519         void (*fini) (struct efx_nic *efx);
 520         void (*reconfigure) (struct efx_nic *efx);
 521         void (*clear_interrupt) (struct efx_nic *efx);
 522         int (*check_hw) (struct efx_nic *efx);
 523         void (*reset_xaui) (struct efx_nic *efx);
 524         int mmds;
 525         unsigned loopbacks;
 526 };
 527
 528 /*
 529  * Efx extended statistics
 530  *
 531  * Not all statistics are provided by all supported MACs.  The purpose
 532  * is this structure is to contain the raw statistics provided by each
 533  * MAC.
 534  */
 535 struct efx_mac_stats {
 536         u64 tx_bytes;
 537         u64 tx_good_bytes;
 538         u64 tx_bad_bytes;
 539         unsigned long tx_packets;
 540         unsigned long tx_bad;
 541         unsigned long tx_pause;
 542         unsigned long tx_control;
 543         unsigned long tx_unicast;
 544         unsigned long tx_multicast;
 545         unsigned long tx_broadcast;
 546         unsigned long tx_lt64;
 547         unsigned long tx_64;
 548         unsigned long tx_65_to_127;
 549         unsigned long tx_128_to_255;
 550         unsigned long tx_256_to_511;
 551         unsigned long tx_512_to_1023;
 552         unsigned long tx_1024_to_15xx;
 553         unsigned long tx_15xx_to_jumbo;
 554         unsigned long tx_gtjumbo;
 555         unsigned long tx_collision;
 556         unsigned long tx_single_collision;
 557         unsigned long tx_multiple_collision;
 558         unsigned long tx_excessive_collision;
 559         unsigned long tx_deferred;
 560         unsigned long tx_late_collision;
 561         unsigned long tx_excessive_deferred;
 562         unsigned long tx_non_tcpudp;
 563         unsigned long tx_mac_src_error;
 564         unsigned long tx_ip_src_error;
 565         u64 rx_bytes;
 566         u64 rx_good_bytes;
 567         u64 rx_bad_bytes;
 568         unsigned long rx_packets;
 569         unsigned long rx_good;
 570         unsigned long rx_bad;
 571         unsigned long rx_pause;
 572         unsigned long rx_control;
 573         unsigned long rx_unicast;
 574         unsigned long rx_multicast;
 575         unsigned long rx_broadcast;
 576         unsigned long rx_lt64;
 577         unsigned long rx_64;
 578         unsigned long rx_65_to_127;
 579         unsigned long rx_128_to_255;
 580         unsigned long rx_256_to_511;
 581         unsigned long rx_512_to_1023;
 582         unsigned long rx_1024_to_15xx;
 583         unsigned long rx_15xx_to_jumbo;
 584         unsigned long rx_gtjumbo;
 585         unsigned long rx_bad_lt64;
 586         unsigned long rx_bad_64_to_15xx;
 587         unsigned long rx_bad_15xx_to_jumbo;
 588         unsigned long rx_bad_gtjumbo;
 589         unsigned long rx_overflow;
 590         unsigned long rx_missed;
 591         unsigned long rx_false_carrier;
 592         unsigned long rx_symbol_error;
 593         unsigned long rx_align_error;
 594         unsigned long rx_length_error;
 595         unsigned long rx_internal_error;
 596         unsigned long rx_good_lt64;
 597 };
 598
 599 /* Number of bits used in a multicast filter hash address */
 600 #define EFX_MCAST_HASH_BITS 8
 601
 602 /* Number of (single-bit) entries in a multicast filter hash */
 603 #define EFX_MCAST_HASH_ENTRIES (1 << EFX_MCAST_HASH_BITS)
 604
 605 /* An Efx multicast filter hash */
 606 union efx_multicast_hash {
 607         u8 byte[EFX_MCAST_HASH_ENTRIES / 8];
 608         efx_oword_t oword[EFX_MCAST_HASH_ENTRIES / sizeof(efx_oword_t) / 8];
 609 };
 610
 611 /**
 612  * struct efx_nic - an Efx NIC
 613  * @name: Device name (net device name or bus id before net device registered)
 614  * @pci_dev: The PCI device
 615  * @type: Controller type attributes
 616  * @legacy_irq: IRQ number
 617  * @workqueue: Workqueue for port reconfigures and the HW monitor.
 618  *      Work items do not hold and must not acquire RTNL.
 619  * @reset_workqueue: Workqueue for resets.  Work item will acquire RTNL.
 620  * @reset_work: Scheduled reset workitem
 621  * @monitor_work: Hardware monitor workitem
 622  * @membase_phys: Memory BAR value as physical address
 623  * @membase: Memory BAR value
 624  * @biu_lock: BIU (bus interface unit) lock
 625  * @interrupt_mode: Interrupt mode
 626  * @i2c_adap: I2C adapter
 627  * @board_info: Board-level information
 628  * @state: Device state flag. Serialised by the rtnl_lock.
 629  * @reset_pending: Pending reset method (normally RESET_TYPE_NONE)
 630  * @tx_queue: TX DMA queues
 631  * @rx_queue: RX DMA queues
 632  * @channel: Channels
 633  * @rss_queues: Number of RSS queues
 634  * @rx_buffer_len: RX buffer length
 635  * @rx_buffer_order: Order (log2) of number of pages for each RX buffer
 636  * @irq_status: Interrupt status buffer
 637  * @last_irq_cpu: Last CPU to handle interrupt.
 638  *      This register is written with the SMP processor ID whenever an
 639  *      interrupt is handled.  It is used by falcon_test_interrupt()
 640  *      to verify that an interrupt has occurred.
 641  * @n_rx_nodesc_drop_cnt: RX no descriptor drop count
 642  * @nic_data: Hardware dependant state
 643  * @mac_lock: MAC access lock. Protects @port_enabled, efx_monitor() and
 644  *      efx_reconfigure_port()
 645  * @port_enabled: Port enabled indicator.
 646  *      Serialises efx_stop_all(), efx_start_all() and efx_monitor() and
 647  *      efx_reconfigure_work with kernel interfaces. Safe to read under any
 648  *      one of the rtnl_lock, mac_lock, or netif_tx_lock, but all three must
 649  *      be held to modify it.
 650  * @port_initialized: Port initialized?
 651  * @net_dev: Operating system network device. Consider holding the rtnl lock
 652  * @rx_checksum_enabled: RX checksumming enabled
 653  * @netif_stop_count: Port stop count
 654  * @netif_stop_lock: Port stop lock
 655  * @mac_stats: MAC statistics. These include all statistics the MACs
 656  *      can provide.  Generic code converts these into a standard
 657  *      &struct net_device_stats.
 658  * @stats_buffer: DMA buffer for statistics
 659  * @stats_lock: Statistics update lock
 660  * @mac_address: Permanent MAC address
 661  * @phy_type: PHY type
 662  * @phy_lock: PHY access lock
 663  * @phy_op: PHY interface
 664  * @phy_data: PHY private data (including PHY-specific stats)
 665  * @mii: PHY interface
 666  * @tx_disabled: PHY transmitter turned off
 667  * @link_up: Link status
 668  * @link_options: Link options (MII/GMII format)
 669  * @n_link_state_changes: Number of times the link has changed state
 670  * @promiscuous: Promiscuous flag. Protected by netif_tx_lock.
 671  * @multicast_hash: Multicast hash table
 672  * @flow_control: Flow control flags - separate RX/TX so can't use link_options
 673  * @reconfigure_work: work item for dealing with PHY events
 674  * @loopback_mode: Loopback status
 675  * @loopback_modes: Supported loopback mode bitmask
 676  * @loopback_selftest: Offline self-test private state
 677  *
 678  * The @priv field of the corresponding &struct net_device points to
 679  * this.
 680  */
 681 struct efx_nic {
 682         char name[IFNAMSIZ];
 683         struct pci_dev *pci_dev;
 684         const struct efx_nic_type *type;
 685         int legacy_irq;
 686         struct workqueue_struct *workqueue;
 687         struct workqueue_struct *reset_workqueue;
 688         struct work_struct reset_work;
 689         struct delayed_work monitor_work;
 690         resource_size_t membase_phys;
 691         void __iomem *membase;
 692         spinlock_t biu_lock;
 693         enum efx_int_mode interrupt_mode;
 694
 695         struct i2c_adapter i2c_adap;
 696         struct efx_board board_info;
 697
 698         enum nic_state state;
 699         enum reset_type reset_pending;
 700
 701         struct efx_tx_queue tx_queue[EFX_TX_QUEUE_COUNT];
 702         struct efx_rx_queue rx_queue[EFX_MAX_RX_QUEUES];
 703         struct efx_channel channel[EFX_MAX_CHANNELS];
 704
 705         int rss_queues;
 706         unsigned int rx_buffer_len;
 707         unsigned int rx_buffer_order;
 708
 709         struct efx_buffer irq_status;
 710         volatile signed int last_irq_cpu;
 711
 712         unsigned n_rx_nodesc_drop_cnt;
 713
 714         struct falcon_nic_data *nic_data;
 715
 716         struct mutex mac_lock;
 717         int port_enabled;
 718
 719         int port_initialized;
 720         struct net_device *net_dev;
 721         int rx_checksum_enabled;
 722
 723         atomic_t netif_stop_count;
 724         spinlock_t netif_stop_lock;
 725
 726         struct efx_mac_stats mac_stats;
 727         struct efx_buffer stats_buffer;
 728         spinlock_t stats_lock;
 729
 730         unsigned char mac_address[ETH_ALEN];
 731
 732         enum phy_type phy_type;
 733         spinlock_t phy_lock;
 734         struct efx_phy_operations *phy_op;
 735         void *phy_data;
 736         struct mii_if_info mii;
 737         unsigned tx_disabled;
 738
 739         int link_up;
 740         unsigned int link_options;
 741         unsigned int n_link_state_changes;
 742
 743         int promiscuous;
 744         union efx_multicast_hash multicast_hash;
 745         enum efx_fc_type flow_control;
 746         struct work_struct reconfigure_work;
 747
 748         atomic_t rx_reset;
 749         enum efx_loopback_mode loopback_mode;
 750         unsigned int loopback_modes;
 751
 752         void *loopback_selftest;
 753 };
 754
 755 static inline int efx_dev_registered(struct efx_nic *efx)
 756 {
 757         return efx->net_dev->reg_state == NETREG_REGISTERED;
 758 }
 759
 760 /* Net device name, for inclusion in log messages if it has been registered.
 761  * Use efx->name not efx->net_dev->name so that races with (un)registration
 762  * are harmless.
 763  */
 764 static inline const char *efx_dev_name(struct efx_nic *efx)
 765 {
 766         return efx_dev_registered(efx) ? efx->name : "";
 767 }
 768
 769 /**
 770  * struct efx_nic_type - Efx device type definition
 771  * @mem_bar: Memory BAR number
 772  * @mem_map_size: Memory BAR mapped size
 773  * @txd_ptr_tbl_base: TX descriptor ring base address
 774  * @rxd_ptr_tbl_base: RX descriptor ring base address
 775  * @buf_tbl_base: Buffer table base address
 776  * @evq_ptr_tbl_base: Event queue pointer table base address
 777  * @evq_rptr_tbl_base: Event queue read-pointer table base address
 778  * @txd_ring_mask: TX descriptor ring size - 1 (must be a power of two - 1)
 779  * @rxd_ring_mask: RX descriptor ring size - 1 (must be a power of two - 1)
 780  * @evq_size: Event queue size (must be a power of two)
 781  * @max_dma_mask: Maximum possible DMA mask
 782  * @tx_dma_mask: TX DMA mask
 783  * @bug5391_mask: Address mask for bug 5391 workaround
 784  * @rx_xoff_thresh: RX FIFO XOFF watermark (bytes)
 785  * @rx_xon_thresh: RX FIFO XON watermark (bytes)
 786  * @rx_buffer_padding: Padding added to each RX buffer
 787  * @max_interrupt_mode: Highest capability interrupt mode supported
 788  *      from &enum efx_init_mode.
 789  * @phys_addr_channels: Number of channels with physically addressed
 790  *      descriptors
 791  */
 792 struct efx_nic_type {
 793         unsigned int mem_bar;
 794         unsigned int mem_map_size;
 795         unsigned int txd_ptr_tbl_base;
 796         unsigned int rxd_ptr_tbl_base;
 797         unsigned int buf_tbl_base;
 798         unsigned int evq_ptr_tbl_base;
 799         unsigned int evq_rptr_tbl_base;
 800
 801         unsigned int txd_ring_mask;
 802         unsigned int rxd_ring_mask;
 803         unsigned int evq_size;
 804         u64 max_dma_mask;
 805         unsigned int tx_dma_mask;
 806         unsigned bug5391_mask;
 807
 808         int rx_xoff_thresh;
 809         int rx_xon_thresh;
 810         unsigned int rx_buffer_padding;
 811         unsigned int max_interrupt_mode;
 812         unsigned int phys_addr_channels;
 813 };
 814
 815 /**************************************************************************
 816  *
 817  * Prototypes and inline functions
 818  *
 819  *************************************************************************/
 820
 821 /* Iterate over all used channels */
 822 #define efx_for_each_channel(_channel, _efx)                            \
 823         for (_channel = &_efx->channel[0];                              \
 824              _channel < &_efx->channel[EFX_MAX_CHANNELS];               \
 825              _channel++)                                                \
 826                 if (!_channel->used_flags)                              \
 827                         continue;                                       \
 828                 else
 829
 830 /* Iterate over all used channels with interrupts */
 831 #define efx_for_each_channel_with_interrupt(_channel, _efx)             \
 832         for (_channel = &_efx->channel[0];                              \
 833              _channel < &_efx->channel[EFX_MAX_CHANNELS];               \
 834              _channel++)                                                \
 835                 if (!(_channel->used_flags && _channel->has_interrupt)) \
 836                         continue;                                       \
 837                 else
 838
 839 /* Iterate over all used TX queues */
 840 #define efx_for_each_tx_queue(_tx_queue, _efx)                          \
 841         for (_tx_queue = &_efx->tx_queue[0];                            \
 842              _tx_queue < &_efx->tx_queue[EFX_TX_QUEUE_COUNT];           \
 843              _tx_queue++)
 844
 845 /* Iterate over all TX queues belonging to a channel */
 846 #define efx_for_each_channel_tx_queue(_tx_queue, _channel)              \
 847         for (_tx_queue = &_channel->efx->tx_queue[0];                   \
 848              _tx_queue < &_channel->efx->tx_queue[EFX_TX_QUEUE_COUNT];  \
 849              _tx_queue++)                                               \
 850                 if (_tx_queue->channel != _channel)                     \
 851                         continue;                                       \
 852                 else
 853
 854 /* Iterate over all used RX queues */
 855 #define efx_for_each_rx_queue(_rx_queue, _efx)                          \
 856         for (_rx_queue = &_efx->rx_queue[0];                            \
 857              _rx_queue < &_efx->rx_queue[EFX_MAX_RX_QUEUES];            \
 858              _rx_queue++)                                               \
 859                 if (!_rx_queue->used)                                   \
 860                         continue;                                       \
 861                 else
 862
 863 /* Iterate over all RX queues belonging to a channel */
 864 #define efx_for_each_channel_rx_queue(_rx_queue, _channel)              \
 865         for (_rx_queue = &_channel->efx->rx_queue[0];                   \
 866              _rx_queue < &_channel->efx->rx_queue[EFX_MAX_RX_QUEUES];   \
 867              _rx_queue++)                                               \
 868                 if ((!_rx_queue->used) ||                               \
 869                     (_rx_queue->channel != _channel))                   \
 870                         continue;                                       \
 871                 else
 872
 873 /* Returns a pointer to the specified receive buffer in the RX
 874  * descriptor queue.
 875  */
 876 static inline struct efx_rx_buffer *efx_rx_buffer(struct efx_rx_queue *rx_queue,
 877                                                   unsigned int index)
 878 {
 879         return (&rx_queue->buffer[index]);
 880 }
 881
 882 /* Set bit in a little-endian bitfield */
 883 static inline void set_bit_le(unsigned nr, unsigned char *addr)
 884 {
 885         addr[nr / 8] |= (1 << (nr % 8));
 886 }
 887
 888 /* Clear bit in a little-endian bitfield */
 889 static inline void clear_bit_le(unsigned nr, unsigned char *addr)
 890 {
 891         addr[nr / 8] &= ~(1 << (nr % 8));
 892 }
 893
 894
 895 /**
 896  * EFX_MAX_FRAME_LEN - calculate maximum frame length
 897  *
 898  * This calculates the maximum frame length that will be used for a
 899  * given MTU.  The frame length will be equal to the MTU plus a
 900  * constant amount of header space and padding.  This is the quantity
 901  * that the net driver will program into the MAC as the maximum frame
 902  * length.
 903  *
 904  * The 10G MAC used in Falcon requires 8-byte alignment on the frame
 905  * length, so we round up to the nearest 8.
 906  */
 907 #define EFX_MAX_FRAME_LEN(mtu) \
 908         ((((mtu) + ETH_HLEN + VLAN_HLEN + 4/* FCS */) + 7) & ~7)
 909
 910
 911 #endif /* EFX_NET_DRIVER_H */