drivers/net/wireless/brcm80211/brcmfmac/fwsignal.c

   1 /*
   2  * Copyright (c) 2010 Broadcom Corporation
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  11  * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
  13  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  14  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16 #include <linux/types.h>
  17 #include <linux/module.h>
  18 #include <linux/if_ether.h>
  19 #include <linux/spinlock.h>
  20 #include <linux/skbuff.h>
  21 #include <linux/netdevice.h>
  22 #include <linux/etherdevice.h>
  23 #include <linux/err.h>
  24 #include <linux/jiffies.h>
  25 #include <net/cfg80211.h>
  26
  27 #include <brcmu_utils.h>
  28 #include <brcmu_wifi.h>
  29 #include "dhd.h"
  30 #include "dhd_proto.h"
  31 #include "dhd_dbg.h"
  32 #include "dhd_bus.h"
  33 #include "fwil.h"
  34 #include "fwil_types.h"
  35 #include "fweh.h"
  36 #include "fwsignal.h"
  37 #include "p2p.h"
  38 #include "wl_cfg80211.h"
  39
  40 /**
  41  * DOC: Firmware Signalling
  42  *
  43  * Firmware can send signals to host and vice versa, which are passed in the
  44  * data packets using TLV based header. This signalling layer is on top of the
  45  * BDC bus protocol layer.
  46  */
  47
  48 /*
  49  * single definition for firmware-driver flow control tlv's.
  50  *
  51  * each tlv is specified by BRCMF_FWS_TLV_DEF(name, ID, length).
  52  * A length value 0 indicates variable length tlv.
  53  */
  54 #define BRCMF_FWS_TLV_DEFLIST \
  55         BRCMF_FWS_TLV_DEF(MAC_OPEN, 1, 1) \
  56         BRCMF_FWS_TLV_DEF(MAC_CLOSE, 2, 1) \
  57         BRCMF_FWS_TLV_DEF(MAC_REQUEST_CREDIT, 3, 2) \
  58         BRCMF_FWS_TLV_DEF(TXSTATUS, 4, 4) \
  59         BRCMF_FWS_TLV_DEF(PKTTAG, 5, 4) \
  60         BRCMF_FWS_TLV_DEF(MACDESC_ADD,  6, 8) \
  61         BRCMF_FWS_TLV_DEF(MACDESC_DEL, 7, 8) \
  62         BRCMF_FWS_TLV_DEF(RSSI, 8, 1) \
  63         BRCMF_FWS_TLV_DEF(INTERFACE_OPEN, 9, 1) \
  64         BRCMF_FWS_TLV_DEF(INTERFACE_CLOSE, 10, 1) \
  65         BRCMF_FWS_TLV_DEF(FIFO_CREDITBACK, 11, 6) \
  66         BRCMF_FWS_TLV_DEF(PENDING_TRAFFIC_BMP, 12, 2) \
  67         BRCMF_FWS_TLV_DEF(MAC_REQUEST_PACKET, 13, 3) \
  68         BRCMF_FWS_TLV_DEF(HOST_REORDER_RXPKTS, 14, 10) \
  69         BRCMF_FWS_TLV_DEF(TRANS_ID, 18, 6) \
  70         BRCMF_FWS_TLV_DEF(COMP_TXSTATUS, 19, 1) \
  71         BRCMF_FWS_TLV_DEF(FILLER, 255, 0)
  72
  73 /*
  74  * enum brcmf_fws_tlv_type - definition of tlv identifiers.
  75  */
  76 #define BRCMF_FWS_TLV_DEF(name, id, len) \
  77         BRCMF_FWS_TYPE_ ## name =  id,
  78 enum brcmf_fws_tlv_type {
  79         BRCMF_FWS_TLV_DEFLIST
  80         BRCMF_FWS_TYPE_INVALID
  81 };
  82 #undef BRCMF_FWS_TLV_DEF
  83
  84 /*
  85  * enum brcmf_fws_tlv_len - definition of tlv lengths.
  86  */
  87 #define BRCMF_FWS_TLV_DEF(name, id, len) \
  88         BRCMF_FWS_TYPE_ ## name ## _LEN = (len),
  89 enum brcmf_fws_tlv_len {
  90         BRCMF_FWS_TLV_DEFLIST
  91 };
  92 #undef BRCMF_FWS_TLV_DEF
  93
  94 #ifdef DEBUG
  95 /*
  96  * brcmf_fws_tlv_names - array of tlv names.
  97  */
  98 #define BRCMF_FWS_TLV_DEF(name, id, len) \
  99         { id, #name },
 100 static struct {
 101         enum brcmf_fws_tlv_type id;
 102         const char *name;
 103 } brcmf_fws_tlv_names[] = {
 104         BRCMF_FWS_TLV_DEFLIST
 105 };
 106 #undef BRCMF_FWS_TLV_DEF
 107
 108 static const char *brcmf_fws_get_tlv_name(enum brcmf_fws_tlv_type id)
 109 {
 110         int i;
 111
 112         for (i = 0; i < ARRAY_SIZE(brcmf_fws_tlv_names); i++)
 113                 if (brcmf_fws_tlv_names[i].id == id)
 114                         return brcmf_fws_tlv_names[i].name;
 115
 116         return "INVALID";
 117 }
 118 #else
 119 static const char *brcmf_fws_get_tlv_name(enum brcmf_fws_tlv_type id)
 120 {
 121         return "NODEBUG";
 122 }
 123 #endif /* DEBUG */
 124
 125 /*
 126  * flags used to enable tlv signalling from firmware.
 127  */
 128 #define BRCMF_FWS_FLAGS_RSSI_SIGNALS                    0x0001
 129 #define BRCMF_FWS_FLAGS_XONXOFF_SIGNALS                 0x0002
 130 #define BRCMF_FWS_FLAGS_CREDIT_STATUS_SIGNALS           0x0004
 131 #define BRCMF_FWS_FLAGS_HOST_PROPTXSTATUS_ACTIVE        0x0008
 132 #define BRCMF_FWS_FLAGS_PSQ_GENERATIONFSM_ENABLE        0x0010
 133 #define BRCMF_FWS_FLAGS_PSQ_ZERO_BUFFER_ENABLE          0x0020
 134 #define BRCMF_FWS_FLAGS_HOST_RXREORDER_ACTIVE           0x0040
 135
 136 #define BRCMF_FWS_MAC_DESC_TABLE_SIZE                   32
 137 #define BRCMF_FWS_MAC_DESC_ID_INVALID                   0xff
 138
 139 #define BRCMF_FWS_HOSTIF_FLOWSTATE_OFF                  0
 140 #define BRCMF_FWS_HOSTIF_FLOWSTATE_ON                   1
 141 #define BRCMF_FWS_FLOWCONTROL_HIWATER                   128
 142 #define BRCMF_FWS_FLOWCONTROL_LOWATER                   64
 143
 144 #define BRCMF_FWS_PSQ_PREC_COUNT                ((BRCMF_FWS_FIFO_COUNT + 1) * 2)
 145 #define BRCMF_FWS_PSQ_LEN                               256
 146
 147 #define BRCMF_FWS_HTOD_FLAG_PKTFROMHOST                 0x01
 148 #define BRCMF_FWS_HTOD_FLAG_PKT_REQUESTED               0x02
 149
 150 #define BRCMF_FWS_RET_OK_NOSCHEDULE     0
 151 #define BRCMF_FWS_RET_OK_SCHEDULE       1
 152
 153 /**
 154  * enum brcmf_fws_skb_state - indicates processing state of skb.
 155  *
 156  * @BRCMF_FWS_SKBSTATE_NEW: sk_buff is newly arrived in the driver.
 157  * @BRCMF_FWS_SKBSTATE_DELAYED: sk_buff had to wait on queue.
 158  * @BRCMF_FWS_SKBSTATE_SUPPRESSED: sk_buff has been suppressed by firmware.
 159  * @BRCMF_FWS_SKBSTATE_TIM: allocated for TIM update info.
 160  */
 161 enum brcmf_fws_skb_state {
 162         BRCMF_FWS_SKBSTATE_NEW,
 163         BRCMF_FWS_SKBSTATE_DELAYED,
 164         BRCMF_FWS_SKBSTATE_SUPPRESSED,
 165         BRCMF_FWS_SKBSTATE_TIM
 166 };
 167
 168 /**
 169  * struct brcmf_skbuff_cb - control buffer associated with skbuff.
 170  *
 171  * @if_flags: holds interface index and packet related flags.
 172  * @htod: host to device packet identifier (used in PKTTAG tlv).
 173  * @state: transmit state of the packet.
 174  * @mac: descriptor related to destination for this packet.
 175  *
 176  * This information is stored in control buffer struct sk_buff::cb, which
 177  * provides 48 bytes of storage so this structure should not exceed that.
 178  */
 179 struct brcmf_skbuff_cb {
 180         u16 if_flags;
 181         u32 htod;
 182         enum brcmf_fws_skb_state state;
 183         struct brcmf_fws_mac_descriptor *mac;
 184 };
 185
 186 /*
 187  * macro casting skbuff control buffer to struct brcmf_skbuff_cb.
 188  */
 189 #define brcmf_skbcb(skb)        ((struct brcmf_skbuff_cb *)((skb)->cb))
 190
 191 /*
 192  * sk_buff control if flags
 193  *
 194  *      b[11]  - packet sent upon firmware request.
 195  *      b[10]  - packet only contains signalling data.
 196  *      b[9]   - packet is a tx packet.
 197  *      b[8]   - packet used requested credit
 198  *      b[7]   - interface in AP mode.
 199  *      b[3:0] - interface index.
 200  */
 201 #define BRCMF_SKB_IF_FLAGS_REQUESTED_MASK       0x0800
 202 #define BRCMF_SKB_IF_FLAGS_REQUESTED_SHIFT      11
 203 #define BRCMF_SKB_IF_FLAGS_SIGNAL_ONLY_MASK     0x0400
 204 #define BRCMF_SKB_IF_FLAGS_SIGNAL_ONLY_SHIFT    10
 205 #define BRCMF_SKB_IF_FLAGS_TRANSMIT_MASK        0x0200
 206 #define BRCMF_SKB_IF_FLAGS_TRANSMIT_SHIFT       9
 207 #define BRCMF_SKB_IF_FLAGS_REQ_CREDIT_MASK      0x0100
 208 #define BRCMF_SKB_IF_FLAGS_REQ_CREDIT_SHIFT     8
 209 #define BRCMF_SKB_IF_FLAGS_IF_AP_MASK           0x0080
 210 #define BRCMF_SKB_IF_FLAGS_IF_AP_SHIFT          7
 211 #define BRCMF_SKB_IF_FLAGS_INDEX_MASK           0x000f
 212 #define BRCMF_SKB_IF_FLAGS_INDEX_SHIFT          0
 213
 214 #define brcmf_skb_if_flags_set_field(skb, field, value) \
 215         brcmu_maskset16(&(brcmf_skbcb(skb)->if_flags), \
 216                         BRCMF_SKB_IF_FLAGS_ ## field ## _MASK, \
 217                         BRCMF_SKB_IF_FLAGS_ ## field ## _SHIFT, (value))
 218 #define brcmf_skb_if_flags_get_field(skb, field) \
 219         brcmu_maskget16(brcmf_skbcb(skb)->if_flags, \
 220                         BRCMF_SKB_IF_FLAGS_ ## field ## _MASK, \
 221                         BRCMF_SKB_IF_FLAGS_ ## field ## _SHIFT)
 222
 223 /*
 224  * sk_buff control packet identifier
 225  *
 226  * 32-bit packet identifier used in PKTTAG tlv from host to dongle.
 227  *
 228  * - Generated at the host (e.g. dhd)
 229  * - Seen as a generic sequence number by firmware except for the flags field.
 230  *
 231  * Generation   : b[31] => generation number for this packet [host->fw]
 232  *                         OR, current generation number [fw->host]
 233  * Flags        : b[30:27] => command, status flags
 234  * FIFO-AC      : b[26:24] => AC-FIFO id
 235  * h-slot       : b[23:8] => hanger-slot
 236  * freerun      : b[7:0] => A free running counter
 237  */
 238 #define BRCMF_SKB_HTOD_TAG_GENERATION_MASK              0x80000000
 239 #define BRCMF_SKB_HTOD_TAG_GENERATION_SHIFT             31
 240 #define BRCMF_SKB_HTOD_TAG_FLAGS_MASK                   0x78000000
 241 #define BRCMF_SKB_HTOD_TAG_FLAGS_SHIFT                  27
 242 #define BRCMF_SKB_HTOD_TAG_FIFO_MASK                    0x07000000
 243 #define BRCMF_SKB_HTOD_TAG_FIFO_SHIFT                   24
 244 #define BRCMF_SKB_HTOD_TAG_HSLOT_MASK                   0x00ffff00
 245 #define BRCMF_SKB_HTOD_TAG_HSLOT_SHIFT                  8
 246 #define BRCMF_SKB_HTOD_TAG_FREERUN_MASK                 0x000000ff
 247 #define BRCMF_SKB_HTOD_TAG_FREERUN_SHIFT                0
 248
 249 #define brcmf_skb_htod_tag_set_field(skb, field, value) \
 250         brcmu_maskset32(&(brcmf_skbcb(skb)->htod), \
 251                         BRCMF_SKB_HTOD_TAG_ ## field ## _MASK, \
 252                         BRCMF_SKB_HTOD_TAG_ ## field ## _SHIFT, (value))
 253 #define brcmf_skb_htod_tag_get_field(skb, field) \
 254         brcmu_maskget32(brcmf_skbcb(skb)->htod, \
 255                         BRCMF_SKB_HTOD_TAG_ ## field ## _MASK, \
 256                         BRCMF_SKB_HTOD_TAG_ ## field ## _SHIFT)
 257
 258 #define BRCMF_FWS_TXSTAT_GENERATION_MASK        0x80000000
 259 #define BRCMF_FWS_TXSTAT_GENERATION_SHIFT       31
 260 #define BRCMF_FWS_TXSTAT_FLAGS_MASK             0x78000000
 261 #define BRCMF_FWS_TXSTAT_FLAGS_SHIFT            27
 262 #define BRCMF_FWS_TXSTAT_FIFO_MASK              0x07000000
 263 #define BRCMF_FWS_TXSTAT_FIFO_SHIFT             24
 264 #define BRCMF_FWS_TXSTAT_HSLOT_MASK             0x00FFFF00
 265 #define BRCMF_FWS_TXSTAT_HSLOT_SHIFT            8
 266 #define BRCMF_FWS_TXSTAT_PKTID_MASK             0x00FFFFFF
 267 #define BRCMF_FWS_TXSTAT_PKTID_SHIFT            0
 268
 269 #define brcmf_txstatus_get_field(txs, field) \
 270         brcmu_maskget32(txs, BRCMF_FWS_TXSTAT_ ## field ## _MASK, \
 271                         BRCMF_FWS_TXSTAT_ ## field ## _SHIFT)
 272
 273 /* How long to defer borrowing in jiffies */
 274 #define BRCMF_FWS_BORROW_DEFER_PERIOD           (HZ / 10)
 275
 276 /**
 277  * enum brcmf_fws_fifo - fifo indices used by dongle firmware.
 278  *
 279  * @BRCMF_FWS_FIFO_FIRST: first fifo, ie. background.
 280  * @BRCMF_FWS_FIFO_AC_BK: fifo for background traffic.
 281  * @BRCMF_FWS_FIFO_AC_BE: fifo for best-effort traffic.
 282  * @BRCMF_FWS_FIFO_AC_VI: fifo for video traffic.
 283  * @BRCMF_FWS_FIFO_AC_VO: fifo for voice traffic.
 284  * @BRCMF_FWS_FIFO_BCMC: fifo for broadcast/multicast (AP only).
 285  * @BRCMF_FWS_FIFO_ATIM: fifo for ATIM (AP only).
 286  * @BRCMF_FWS_FIFO_COUNT: number of fifos.
 287  */
 288 enum brcmf_fws_fifo {
 289         BRCMF_FWS_FIFO_FIRST,
 290         BRCMF_FWS_FIFO_AC_BK = BRCMF_FWS_FIFO_FIRST,
 291         BRCMF_FWS_FIFO_AC_BE,
 292         BRCMF_FWS_FIFO_AC_VI,
 293         BRCMF_FWS_FIFO_AC_VO,
 294         BRCMF_FWS_FIFO_BCMC,
 295         BRCMF_FWS_FIFO_ATIM,
 296         BRCMF_FWS_FIFO_COUNT
 297 };
 298
 299 /**
 300  * enum brcmf_fws_txstatus - txstatus flag values.
 301  *
 302  * @BRCMF_FWS_TXSTATUS_DISCARD:
 303  *      host is free to discard the packet.
 304  * @BRCMF_FWS_TXSTATUS_CORE_SUPPRESS:
 305  *      802.11 core suppressed the packet.
 306  * @BRCMF_FWS_TXSTATUS_FW_PS_SUPPRESS:
 307  *      firmware suppress the packet as device is already in PS mode.
 308  * @BRCMF_FWS_TXSTATUS_FW_TOSSED:
 309  *      firmware tossed the packet.
 310  * @BRCMF_FWS_TXSTATUS_HOST_TOSSED:
 311  *      host tossed the packet.
 312  */
 313 enum brcmf_fws_txstatus {
 314         BRCMF_FWS_TXSTATUS_DISCARD,
 315         BRCMF_FWS_TXSTATUS_CORE_SUPPRESS,
 316         BRCMF_FWS_TXSTATUS_FW_PS_SUPPRESS,
 317         BRCMF_FWS_TXSTATUS_FW_TOSSED,
 318         BRCMF_FWS_TXSTATUS_HOST_TOSSED
 319 };
 320
 321 enum brcmf_fws_fcmode {
 322         BRCMF_FWS_FCMODE_NONE,
 323         BRCMF_FWS_FCMODE_IMPLIED_CREDIT,
 324         BRCMF_FWS_FCMODE_EXPLICIT_CREDIT
 325 };
 326
 327 enum brcmf_fws_mac_desc_state {
 328         BRCMF_FWS_STATE_OPEN = 1,
 329         BRCMF_FWS_STATE_CLOSE
 330 };
 331
 332 /**
 333  * struct brcmf_fws_mac_descriptor - firmware signalling data per node/interface
 334  *
 335  * @occupied: slot is in use.
 336  * @mac_handle: handle for mac entry determined by firmware.
 337  * @interface_id: interface index.
 338  * @state: current state.
 339  * @suppressed: mac entry is suppressed.
 340  * @generation: generation bit.
 341  * @ac_bitmap: ac queue bitmap.
 342  * @requested_credit: credits requested by firmware.
 343  * @ea: ethernet address.
 344  * @seq: per-node free-running sequence.
 345  * @psq: power-save queue.
 346  * @transit_count: packet in transit to firmware.
 347  */
 348 struct brcmf_fws_mac_descriptor {
 349         char name[16];
 350         u8 occupied;
 351         u8 mac_handle;
 352         u8 interface_id;
 353         u8 state;
 354         bool suppressed;
 355         u8 generation;
 356         u8 ac_bitmap;
 357         u8 requested_credit;
 358         u8 requested_packet;
 359         u8 ea[ETH_ALEN];
 360         u8 seq[BRCMF_FWS_FIFO_COUNT];
 361         struct pktq psq;
 362         int transit_count;
 363         int suppr_transit_count;
 364         bool send_tim_signal;
 365         u8 traffic_pending_bmp;
 366         u8 traffic_lastreported_bmp;
 367 };
 368
 369 #define BRCMF_FWS_HANGER_MAXITEMS       1024
 370
 371 /**
 372  * enum brcmf_fws_hanger_item_state - state of hanger item.
 373  *
 374  * @BRCMF_FWS_HANGER_ITEM_STATE_FREE: item is free for use.
 375  * @BRCMF_FWS_HANGER_ITEM_STATE_INUSE: item is in use.
 376  * @BRCMF_FWS_HANGER_ITEM_STATE_INUSE_SUPPRESSED: item was suppressed.
 377  */
 378 enum brcmf_fws_hanger_item_state {
 379         BRCMF_FWS_HANGER_ITEM_STATE_FREE = 1,
 380         BRCMF_FWS_HANGER_ITEM_STATE_INUSE,
 381         BRCMF_FWS_HANGER_ITEM_STATE_INUSE_SUPPRESSED
 382 };
 383
 384
 385 /**
 386  * struct brcmf_fws_hanger_item - single entry for tx pending packet.
 387  *
 388  * @state: entry is either free or occupied.
 389  * @pkt: packet itself.
 390  */
 391 struct brcmf_fws_hanger_item {
 392         enum brcmf_fws_hanger_item_state state;
 393         struct sk_buff *pkt;
 394 };
 395
 396 /**
 397  * struct brcmf_fws_hanger - holds packets awaiting firmware txstatus.
 398  *
 399  * @pushed: packets pushed to await txstatus.
 400  * @popped: packets popped upon handling txstatus.
 401  * @failed_to_push: packets that could not be pushed.
 402  * @failed_to_pop: packets that could not be popped.
 403  * @failed_slotfind: packets for which failed to find an entry.
 404  * @slot_pos: last returned item index for a free entry.
 405  * @items: array of hanger items.
 406  */
 407 struct brcmf_fws_hanger {
 408         u32 pushed;
 409         u32 popped;
 410         u32 failed_to_push;
 411         u32 failed_to_pop;
 412         u32 failed_slotfind;
 413         u32 slot_pos;
 414         struct brcmf_fws_hanger_item items[BRCMF_FWS_HANGER_MAXITEMS];
 415 };
 416
 417 struct brcmf_fws_macdesc_table {
 418         struct brcmf_fws_mac_descriptor nodes[BRCMF_FWS_MAC_DESC_TABLE_SIZE];
 419         struct brcmf_fws_mac_descriptor iface[BRCMF_MAX_IFS];
 420         struct brcmf_fws_mac_descriptor other;
 421 };
 422
 423 struct brcmf_fws_info {
 424         struct brcmf_pub *drvr;
 425         struct brcmf_fws_stats stats;
 426         struct brcmf_fws_hanger hanger;
 427         enum brcmf_fws_fcmode fcmode;
 428         bool bcmc_credit_check;
 429         struct brcmf_fws_macdesc_table desc;
 430         struct workqueue_struct *fws_wq;
 431         struct work_struct fws_dequeue_work;
 432         u32 fifo_enqpkt[BRCMF_FWS_FIFO_COUNT];
 433         int fifo_credit[BRCMF_FWS_FIFO_COUNT];
 434         int credits_borrowed[BRCMF_FWS_FIFO_AC_VO + 1];
 435         int deq_node_pos[BRCMF_FWS_FIFO_COUNT];
 436         u32 fifo_credit_map;
 437         u32 fifo_delay_map;
 438         unsigned long borrow_defer_timestamp;
 439         bool bus_flow_blocked;
 440         bool creditmap_received;
 441 };
 442
 443 /*
 444  * brcmf_fws_prio2fifo - mapping from 802.1d priority to firmware fifo index.
 445  */
 446 static const int brcmf_fws_prio2fifo[] = {
 447         BRCMF_FWS_FIFO_AC_BE,
 448         BRCMF_FWS_FIFO_AC_BK,
 449         BRCMF_FWS_FIFO_AC_BK,
 450         BRCMF_FWS_FIFO_AC_BE,
 451         BRCMF_FWS_FIFO_AC_VI,
 452         BRCMF_FWS_FIFO_AC_VI,
 453         BRCMF_FWS_FIFO_AC_VO,
 454         BRCMF_FWS_FIFO_AC_VO
 455 };
 456
 457 static int fcmode;
 458 module_param(fcmode, int, S_IRUSR);
 459 MODULE_PARM_DESC(fcmode, "mode of firmware signalled flow control");
 460
 461 #define BRCMF_FWS_TLV_DEF(name, id, len) \
 462         case BRCMF_FWS_TYPE_ ## name: \
 463                 return len;
 464
 465 /**
 466  * brcmf_fws_get_tlv_len() - returns defined length for given tlv id.
 467  *
 468  * @fws: firmware-signalling information.
 469  * @id: identifier of the TLV.
 470  *
 471  * Return: the specified length for the given TLV; Otherwise -EINVAL.
 472  */
 473 static int brcmf_fws_get_tlv_len(struct brcmf_fws_info *fws,
 474                                  enum brcmf_fws_tlv_type id)
 475 {
 476         switch (id) {
 477         BRCMF_FWS_TLV_DEFLIST
 478         default:
 479                 fws->stats.tlv_invalid_type++;
 480                 break;
 481         }
 482         return -EINVAL;
 483 }
 484 #undef BRCMF_FWS_TLV_DEF
 485
 486 static bool brcmf_fws_ifidx_match(struct sk_buff *skb, void *arg)
 487 {
 488         u32 ifidx = brcmf_skb_if_flags_get_field(skb, INDEX);
 489         return ifidx == *(int *)arg;
 490 }
 491
 492 static void brcmf_fws_psq_flush(struct brcmf_fws_info *fws, struct pktq *q,
 493                                 int ifidx)
 494 {
 495         bool (*matchfn)(struct sk_buff *, void *) = NULL;
 496         struct sk_buff *skb;
 497         int prec;
 498
 499         if (ifidx != -1)
 500                 matchfn = brcmf_fws_ifidx_match;
 501         for (prec = 0; prec < q->num_prec; prec++) {
 502                 skb = brcmu_pktq_pdeq_match(q, prec, matchfn, &ifidx);
 503                 while (skb) {
 504                         brcmu_pkt_buf_free_skb(skb);
 505                         skb = brcmu_pktq_pdeq_match(q, prec, matchfn, &ifidx);
 506                 }
 507         }
 508 }
 509
 510 static void brcmf_fws_hanger_init(struct brcmf_fws_hanger *hanger)
 511 {
 512         int i;
 513
 514         memset(hanger, 0, sizeof(*hanger));
 515         for (i = 0; i < ARRAY_SIZE(hanger->items); i++)
 516                 hanger->items[i].state = BRCMF_FWS_HANGER_ITEM_STATE_FREE;
 517 }
 518
 519 static u32 brcmf_fws_hanger_get_free_slot(struct brcmf_fws_hanger *h)
 520 {
 521         u32 i;
 522
 523         i = (h->slot_pos + 1) % BRCMF_FWS_HANGER_MAXITEMS;
 524
 525         while (i != h->slot_pos) {
 526                 if (h->items[i].state == BRCMF_FWS_HANGER_ITEM_STATE_FREE) {
 527                         h->slot_pos = i;
 528                         goto done;
 529                 }
 530                 i++;
 531                 if (i == BRCMF_FWS_HANGER_MAXITEMS)
 532                         i = 0;
 533         }
 534         brcmf_err("all slots occupied\n");
 535         h->failed_slotfind++;
 536         i = BRCMF_FWS_HANGER_MAXITEMS;
 537 done:
 538         return i;
 539 }
 540
 541 static int brcmf_fws_hanger_pushpkt(struct brcmf_fws_hanger *h,
 542                                     struct sk_buff *pkt, u32 slot_id)
 543 {
 544         if (slot_id >= BRCMF_FWS_HANGER_MAXITEMS)
 545                 return -ENOENT;
 546
 547         if (h->items[slot_id].state != BRCMF_FWS_HANGER_ITEM_STATE_FREE) {
 548                 brcmf_err("slot is not free\n");
 549                 h->failed_to_push++;
 550                 return -EINVAL;
 551         }
 552
 553         h->items[slot_id].state = BRCMF_FWS_HANGER_ITEM_STATE_INUSE;
 554         h->items[slot_id].pkt = pkt;
 555         h->pushed++;
 556         return 0;
 557 }
 558
 559 static int brcmf_fws_hanger_poppkt(struct brcmf_fws_hanger *h,
 560                                           u32 slot_id, struct sk_buff **pktout,
 561                                           bool remove_item)
 562 {
 563         if (slot_id >= BRCMF_FWS_HANGER_MAXITEMS)
 564                 return -ENOENT;
 565
 566         if (h->items[slot_id].state == BRCMF_FWS_HANGER_ITEM_STATE_FREE) {
 567                 brcmf_err("entry not in use\n");
 568                 h->failed_to_pop++;
 569                 return -EINVAL;
 570         }
 571
 572         *pktout = h->items[slot_id].pkt;
 573         if (remove_item) {
 574                 h->items[slot_id].state = BRCMF_FWS_HANGER_ITEM_STATE_FREE;
 575                 h->items[slot_id].pkt = NULL;
 576                 h->popped++;
 577         }
 578         return 0;
 579 }
 580
 581 static int brcmf_fws_hanger_mark_suppressed(struct brcmf_fws_hanger *h,
 582                                             u32 slot_id)
 583 {
 584         if (slot_id >= BRCMF_FWS_HANGER_MAXITEMS)
 585                 return -ENOENT;
 586
 587         if (h->items[slot_id].state == BRCMF_FWS_HANGER_ITEM_STATE_FREE) {
 588                 brcmf_err("entry not in use\n");
 589                 return -EINVAL;
 590         }
 591
 592         h->items[slot_id].state = BRCMF_FWS_HANGER_ITEM_STATE_INUSE_SUPPRESSED;
 593         return 0;
 594 }
 595
 596 static void brcmf_fws_hanger_cleanup(struct brcmf_fws_info *fws,
 597                                      bool (*fn)(struct sk_buff *, void *),
 598                                      int ifidx)
 599 {
 600         struct brcmf_fws_hanger *h = &fws->hanger;
 601         struct sk_buff *skb;
 602         int i;
 603         enum brcmf_fws_hanger_item_state s;
 604
 605         for (i = 0; i < ARRAY_SIZE(h->items); i++) {
 606                 s = h->items[i].state;
 607                 if (s == BRCMF_FWS_HANGER_ITEM_STATE_INUSE ||
 608                     s == BRCMF_FWS_HANGER_ITEM_STATE_INUSE_SUPPRESSED) {
 609                         skb = h->items[i].pkt;
 610                         if (fn == NULL || fn(skb, &ifidx)) {
 611                                 /* suppress packets freed from psq */
 612                                 if (s == BRCMF_FWS_HANGER_ITEM_STATE_INUSE)
 613                                         brcmu_pkt_buf_free_skb(skb);
 614                                 h->items[i].state =
 615                                         BRCMF_FWS_HANGER_ITEM_STATE_FREE;
 616                         }
 617                 }
 618         }
 619 }
 620
 621 static void brcmf_fws_macdesc_set_name(struct brcmf_fws_info *fws,
 622                                        struct brcmf_fws_mac_descriptor *desc)
 623 {
 624         if (desc == &fws->desc.other)
 625                 strlcpy(desc->name, "MAC-OTHER", sizeof(desc->name));
 626         else if (desc->mac_handle)
 627                 scnprintf(desc->name, sizeof(desc->name), "MAC-%d:%d",
 628                           desc->mac_handle, desc->interface_id);
 629         else
 630                 scnprintf(desc->name, sizeof(desc->name), "MACIF:%d",
 631                           desc->interface_id);
 632 }
 633
 634 static void brcmf_fws_macdesc_init(struct brcmf_fws_mac_descriptor *desc,
 635                                    u8 *addr, u8 ifidx)
 636 {
 637         brcmf_dbg(TRACE,
 638                   "enter: desc %p ea=%pM, ifidx=%u\n", desc, addr, ifidx);
 639         desc->occupied = 1;
 640         desc->state = BRCMF_FWS_STATE_OPEN;
 641         desc->requested_credit = 0;
 642         desc->requested_packet = 0;
 643         /* depending on use may need ifp->bssidx instead */
 644         desc->interface_id = ifidx;
 645         desc->ac_bitmap = 0xff; /* update this when handling APSD */
 646         if (addr)
 647                 memcpy(&desc->ea[0], addr, ETH_ALEN);
 648 }
 649
 650 static
 651 void brcmf_fws_macdesc_deinit(struct brcmf_fws_mac_descriptor *desc)
 652 {
 653         brcmf_dbg(TRACE,
 654                   "enter: ea=%pM, ifidx=%u\n", desc->ea, desc->interface_id);
 655         desc->occupied = 0;
 656         desc->state = BRCMF_FWS_STATE_CLOSE;
 657         desc->requested_credit = 0;
 658         desc->requested_packet = 0;
 659 }
 660
 661 static struct brcmf_fws_mac_descriptor *
 662 brcmf_fws_macdesc_lookup(struct brcmf_fws_info *fws, u8 *ea)
 663 {
 664         struct brcmf_fws_mac_descriptor *entry;
 665         int i;
 666
 667         if (ea == NULL)
 668                 return ERR_PTR(-EINVAL);
 669
 670         entry = &fws->desc.nodes[0];
 671         for (i = 0; i < ARRAY_SIZE(fws->desc.nodes); i++) {
 672                 if (entry->occupied && !memcmp(entry->ea, ea, ETH_ALEN))
 673                         return entry;
 674                 entry++;
 675         }
 676
 677         return ERR_PTR(-ENOENT);
 678 }
 679
 680 static struct brcmf_fws_mac_descriptor*
 681 brcmf_fws_macdesc_find(struct brcmf_fws_info *fws, struct brcmf_if *ifp, u8 *da)
 682 {
 683         struct brcmf_fws_mac_descriptor *entry = &fws->desc.other;
 684         bool multicast;
 685
 686         multicast = is_multicast_ether_addr(da);
 687
 688         /* Multicast destination, STA and P2P clients get the interface entry.
 689          * STA/GC gets the Mac Entry for TDLS destinations, TDLS destinations
 690          * have their own entry.
 691          */
 692         if (multicast && ifp->fws_desc) {
 693                 entry = ifp->fws_desc;
 694                 goto done;
 695         }
 696
 697         entry = brcmf_fws_macdesc_lookup(fws, da);
 698         if (IS_ERR(entry))
 699                 entry = ifp->fws_desc;
 700
 701 done:
 702         return entry;
 703 }
 704
 705 static bool brcmf_fws_macdesc_closed(struct brcmf_fws_info *fws,
 706                                      struct brcmf_fws_mac_descriptor *entry,
 707                                      int fifo)
 708 {
 709         struct brcmf_fws_mac_descriptor *if_entry;
 710         bool closed;
 711
 712         /* for unique destination entries the related interface
 713          * may be closed.
 714          */
 715         if (entry->mac_handle) {
 716                 if_entry = &fws->desc.iface[entry->interface_id];
 717                 if (if_entry->state == BRCMF_FWS_STATE_CLOSE)
 718                         return true;
 719         }
 720         /* an entry is closed when the state is closed and
 721          * the firmware did not request anything.
 722          */
 723         closed = entry->state == BRCMF_FWS_STATE_CLOSE &&
 724                  !entry->requested_credit && !entry->requested_packet;
 725
 726         /* Or firmware does not allow traffic for given fifo */
 727         return closed || !(entry->ac_bitmap & BIT(fifo));
 728 }
 729
 730 static void brcmf_fws_macdesc_cleanup(struct brcmf_fws_info *fws,
 731                                       struct brcmf_fws_mac_descriptor *entry,
 732                                       int ifidx)
 733 {
 734         if (entry->occupied && (ifidx == -1 || ifidx == entry->interface_id)) {
 735                 brcmf_fws_psq_flush(fws, &entry->psq, ifidx);
 736                 entry->occupied = !!(entry->psq.len);
 737         }
 738 }
 739
 740 static void brcmf_fws_bus_txq_cleanup(struct brcmf_fws_info *fws,
 741                                       bool (*fn)(struct sk_buff *, void *),
 742                                       int ifidx)
 743 {
 744         struct brcmf_fws_hanger_item *hi;
 745         struct pktq *txq;
 746         struct sk_buff *skb;
 747         int prec;
 748         u32 hslot;
 749
 750         txq = brcmf_bus_gettxq(fws->drvr->bus_if);
 751         if (IS_ERR(txq)) {
 752                 brcmf_dbg(TRACE, "no txq to clean up\n");
 753                 return;
 754         }
 755
 756         for (prec = 0; prec < txq->num_prec; prec++) {
 757                 skb = brcmu_pktq_pdeq_match(txq, prec, fn, &ifidx);
 758                 while (skb) {
 759                         hslot = brcmf_skb_htod_tag_get_field(skb, HSLOT);
 760                         hi = &fws->hanger.items[hslot];
 761                         WARN_ON(skb != hi->pkt);
 762                         hi->state = BRCMF_FWS_HANGER_ITEM_STATE_FREE;
 763                         brcmu_pkt_buf_free_skb(skb);
 764                         skb = brcmu_pktq_pdeq_match(txq, prec, fn, &ifidx);
 765                 }
 766         }
 767 }
 768
 769 static void brcmf_fws_cleanup(struct brcmf_fws_info *fws, int ifidx)
 770 {
 771         int i;
 772         struct brcmf_fws_mac_descriptor *table;
 773         bool (*matchfn)(struct sk_buff *, void *) = NULL;
 774
 775         if (fws == NULL)
 776                 return;
 777
 778         if (ifidx != -1)
 779                 matchfn = brcmf_fws_ifidx_match;
 780
 781         /* cleanup individual nodes */
 782         table = &fws->desc.nodes[0];
 783         for (i = 0; i < ARRAY_SIZE(fws->desc.nodes); i++)
 784                 brcmf_fws_macdesc_cleanup(fws, &table[i], ifidx);
 785
 786         brcmf_fws_macdesc_cleanup(fws, &fws->desc.other, ifidx);
 787         brcmf_fws_bus_txq_cleanup(fws, matchfn, ifidx);
 788         brcmf_fws_hanger_cleanup(fws, matchfn, ifidx);
 789 }
 790
 791 static int brcmf_fws_hdrpush(struct brcmf_fws_info *fws, struct sk_buff *skb)
 792 {
 793         struct brcmf_fws_mac_descriptor *entry = brcmf_skbcb(skb)->mac;
 794         u8 *wlh;
 795         u16 data_offset = 0;
 796         u8 fillers;
 797         __le32 pkttag = cpu_to_le32(brcmf_skbcb(skb)->htod);
 798
 799         brcmf_dbg(TRACE, "enter: ea=%pM, ifidx=%u (%u), pkttag=0x%08X, hslot=%d\n",
 800                   entry->ea, entry->interface_id,
 801                   brcmf_skb_if_flags_get_field(skb, INDEX),
 802                   le32_to_cpu(pkttag), (le32_to_cpu(pkttag) >> 8) & 0xffff);
 803         if (entry->send_tim_signal)
 804                 data_offset += 2 + BRCMF_FWS_TYPE_PENDING_TRAFFIC_BMP_LEN;
 805
 806         /* +2 is for Type[1] and Len[1] in TLV, plus TIM signal */
 807         data_offset += 2 + BRCMF_FWS_TYPE_PKTTAG_LEN;
 808         fillers = round_up(data_offset, 4) - data_offset;
 809         data_offset += fillers;
 810
 811         skb_push(skb, data_offset);
 812         wlh = skb->data;
 813
 814         wlh[0] = BRCMF_FWS_TYPE_PKTTAG;
 815         wlh[1] = BRCMF_FWS_TYPE_PKTTAG_LEN;
 816         memcpy(&wlh[2], &pkttag, sizeof(pkttag));
 817         wlh += BRCMF_FWS_TYPE_PKTTAG_LEN + 2;
 818
 819         if (entry->send_tim_signal) {
 820                 entry->send_tim_signal = 0;
 821                 wlh[0] = BRCMF_FWS_TYPE_PENDING_TRAFFIC_BMP;
 822                 wlh[1] = BRCMF_FWS_TYPE_PENDING_TRAFFIC_BMP_LEN;
 823                 wlh[2] = entry->mac_handle;
 824                 wlh[3] = entry->traffic_pending_bmp;
 825                 brcmf_dbg(TRACE, "adding TIM info: %02X:%02X:%02X:%02X\n",
 826                           wlh[0], wlh[1], wlh[2], wlh[3]);
 827                 wlh += BRCMF_FWS_TYPE_PENDING_TRAFFIC_BMP_LEN + 2;
 828                 entry->traffic_lastreported_bmp = entry->traffic_pending_bmp;
 829         }
 830         if (fillers)
 831                 memset(wlh, BRCMF_FWS_TYPE_FILLER, fillers);
 832
 833         brcmf_proto_hdrpush(fws->drvr, brcmf_skb_if_flags_get_field(skb, INDEX),
 834                             data_offset >> 2, skb);
 835         return 0;
 836 }
 837
 838 static bool brcmf_fws_tim_update(struct brcmf_fws_info *fws,
 839                                  struct brcmf_fws_mac_descriptor *entry,
 840                                  int fifo, bool send_immediately)
 841 {
 842         struct sk_buff *skb;
 843         struct brcmf_bus *bus;
 844         struct brcmf_skbuff_cb *skcb;
 845         s32 err;
 846         u32 len;
 847
 848         /* check delayedQ and suppressQ in one call using bitmap */
 849         if (brcmu_pktq_mlen(&entry->psq, 3 << (fifo * 2)) == 0)
 850                 entry->traffic_pending_bmp &= ~NBITVAL(fifo);
 851         else
 852                 entry->traffic_pending_bmp |= NBITVAL(fifo);
 853
 854         entry->send_tim_signal = false;
 855         if (entry->traffic_lastreported_bmp != entry->traffic_pending_bmp)
 856                 entry->send_tim_signal = true;
 857         if (send_immediately && entry->send_tim_signal &&
 858             entry->state == BRCMF_FWS_STATE_CLOSE) {
 859                 /* create a dummy packet and sent that. The traffic          */
 860                 /* bitmap info will automatically be attached to that packet */
 861                 len = BRCMF_FWS_TYPE_PKTTAG_LEN + 2 +
 862                       BRCMF_FWS_TYPE_PENDING_TRAFFIC_BMP_LEN + 2 +
 863                       4 + fws->drvr->hdrlen;
 864                 skb = brcmu_pkt_buf_get_skb(len);
 865                 if (skb == NULL)
 866                         return false;
 867                 skb_pull(skb, len);
 868                 skcb = brcmf_skbcb(skb);
 869                 skcb->mac = entry;
 870                 skcb->state = BRCMF_FWS_SKBSTATE_TIM;
 871                 bus = fws->drvr->bus_if;
 872                 err = brcmf_fws_hdrpush(fws, skb);
 873                 if (err == 0)
 874                         err = brcmf_bus_txdata(bus, skb);
 875                 if (err)
 876                         brcmu_pkt_buf_free_skb(skb);
 877                 return true;
 878         }
 879         return false;
 880 }
 881
 882 static void
 883 brcmf_fws_flow_control_check(struct brcmf_fws_info *fws, struct pktq *pq,
 884                              u8 if_id)
 885 {
 886         struct brcmf_if *ifp = fws->drvr->iflist[!if_id ? 0 : if_id + 1];
 887
 888         if (WARN_ON(!ifp))
 889                 return;
 890
 891         if ((ifp->netif_stop & BRCMF_NETIF_STOP_REASON_FWS_FC) &&
 892             pq->len <= BRCMF_FWS_FLOWCONTROL_LOWATER)
 893                 brcmf_txflowblock_if(ifp,
 894                                      BRCMF_NETIF_STOP_REASON_FWS_FC, false);
 895         if (!(ifp->netif_stop & BRCMF_NETIF_STOP_REASON_FWS_FC) &&
 896             pq->len >= BRCMF_FWS_FLOWCONTROL_HIWATER) {
 897                 fws->stats.fws_flow_block++;
 898                 brcmf_txflowblock_if(ifp, BRCMF_NETIF_STOP_REASON_FWS_FC, true);
 899         }
 900         return;
 901 }
 902
 903 static int brcmf_fws_rssi_indicate(struct brcmf_fws_info *fws, s8 rssi)
 904 {
 905         brcmf_dbg(CTL, "rssi %d\n", rssi);
 906         return 0;
 907 }
 908
 909 static
 910 int brcmf_fws_macdesc_indicate(struct brcmf_fws_info *fws, u8 type, u8 *data)
 911 {
 912         struct brcmf_fws_mac_descriptor *entry, *existing;
 913         u8 mac_handle;
 914         u8 ifidx;
 915         u8 *addr;
 916
 917         mac_handle = *data++;
 918         ifidx = *data++;
 919         addr = data;
 920
 921         entry = &fws->desc.nodes[mac_handle & 0x1F];
 922         if (type == BRCMF_FWS_TYPE_MACDESC_DEL) {
 923                 if (entry->occupied) {
 924                         brcmf_dbg(TRACE, "deleting %s mac %pM\n",
 925                                   entry->name, addr);
 926                         brcmf_fws_macdesc_cleanup(fws, entry, -1);
 927                         brcmf_fws_macdesc_deinit(entry);
 928                 } else
 929                         fws->stats.mac_update_failed++;
 930                 return 0;
 931         }
 932
 933         existing = brcmf_fws_macdesc_lookup(fws, addr);
 934         if (IS_ERR(existing)) {
 935                 if (!entry->occupied) {
 936                         entry->mac_handle = mac_handle;
 937                         brcmf_fws_macdesc_init(entry, addr, ifidx);
 938                         brcmf_fws_macdesc_set_name(fws, entry);
 939                         brcmu_pktq_init(&entry->psq, BRCMF_FWS_PSQ_PREC_COUNT,
 940                                         BRCMF_FWS_PSQ_LEN);
 941                         brcmf_dbg(TRACE, "add %s mac %pM\n", entry->name, addr);
 942                 } else {
 943                         fws->stats.mac_update_failed++;
 944                 }
 945         } else {
 946                 if (entry != existing) {
 947                         brcmf_dbg(TRACE, "copy mac %s\n", existing->name);
 948                         memcpy(entry, existing,
 949                                offsetof(struct brcmf_fws_mac_descriptor, psq));
 950                         entry->mac_handle = mac_handle;
 951                         brcmf_fws_macdesc_deinit(existing);
 952                         brcmf_fws_macdesc_set_name(fws, entry);
 953                         brcmf_dbg(TRACE, "relocate %s mac %pM\n", entry->name,
 954                                   addr);
 955                 } else {
 956                         brcmf_dbg(TRACE, "use existing\n");
 957                         WARN_ON(entry->mac_handle != mac_handle);
 958                         /* TODO: what should we do here: continue, reinit, .. */
 959                 }
 960         }
 961         return 0;
 962 }
 963
 964 static int brcmf_fws_macdesc_state_indicate(struct brcmf_fws_info *fws,
 965                                             u8 type, u8 *data)
 966 {
 967         struct brcmf_fws_mac_descriptor *entry;
 968         u8 mac_handle;
 969
 970         mac_handle = data[0];
 971         entry = &fws->desc.nodes[mac_handle & 0x1F];
 972         if (!entry->occupied) {
 973                 fws->stats.mac_ps_update_failed++;
 974                 return -ESRCH;
 975         }
 976         /* a state update should wipe old credits */
 977         entry->requested_credit = 0;
 978         entry->requested_packet = 0;
 979         if (type == BRCMF_FWS_TYPE_MAC_OPEN) {
 980                 entry->state = BRCMF_FWS_STATE_OPEN;
 981                 return BRCMF_FWS_RET_OK_SCHEDULE;
 982         } else {
 983                 entry->state = BRCMF_FWS_STATE_CLOSE;
 984                 brcmf_fws_tim_update(fws, entry, BRCMF_FWS_FIFO_AC_BK, false);
 985                 brcmf_fws_tim_update(fws, entry, BRCMF_FWS_FIFO_AC_BE, false);
 986                 brcmf_fws_tim_update(fws, entry, BRCMF_FWS_FIFO_AC_VI, false);
 987                 brcmf_fws_tim_update(fws, entry, BRCMF_FWS_FIFO_AC_VO, true);
 988         }
 989         return BRCMF_FWS_RET_OK_NOSCHEDULE;
 990 }
 991
 992 static int brcmf_fws_interface_state_indicate(struct brcmf_fws_info *fws,
 993                                               u8 type, u8 *data)
 994 {
 995         struct brcmf_fws_mac_descriptor *entry;
 996         u8 ifidx;
 997         int ret;
 998
 999         ifidx = data[0];
1000
1001         if (ifidx >= BRCMF_MAX_IFS) {
1002                 ret = -ERANGE;
1003                 goto fail;
1004         }
1005
1006         entry = &fws->desc.iface[ifidx];
1007         if (!entry->occupied) {
1008                 ret = -ESRCH;
1009                 goto fail;
1010         }
1011
1012         brcmf_dbg(TRACE, "%s (%d): %s\n", brcmf_fws_get_tlv_name(type), type,
1013                   entry->name);
1014         switch (type) {
1015         case BRCMF_FWS_TYPE_INTERFACE_OPEN:
1016                 entry->state = BRCMF_FWS_STATE_OPEN;
1017                 return BRCMF_FWS_RET_OK_SCHEDULE;
1018         case BRCMF_FWS_TYPE_INTERFACE_CLOSE:
1019                 entry->state = BRCMF_FWS_STATE_CLOSE;
1020                 return BRCMF_FWS_RET_OK_NOSCHEDULE;
1021         default:
1022                 ret = -EINVAL;
1023                 break;
1024         }
1025 fail:
1026         fws->stats.if_update_failed++;
1027         return ret;
1028 }
1029
1030 static int brcmf_fws_request_indicate(struct brcmf_fws_info *fws, u8 type,
1031                                       u8 *data)
1032 {
1033         struct brcmf_fws_mac_descriptor *entry;
1034
1035         entry = &fws->desc.nodes[data[1] & 0x1F];
1036         if (!entry->occupied) {
1037                 if (type == BRCMF_FWS_TYPE_MAC_REQUEST_CREDIT)
1038                         fws->stats.credit_request_failed++;
1039                 else
1040                         fws->stats.packet_request_failed++;
1041                 return -ESRCH;
1042         }
1043
1044         brcmf_dbg(TRACE, "%s (%d): %s cnt %d bmp %d\n",
1045                   brcmf_fws_get_tlv_name(type), type, entry->name,
1046                   data[0], data[2]);
1047         if (type == BRCMF_FWS_TYPE_MAC_REQUEST_CREDIT)
1048                 entry->requested_credit = data[0];
1049         else
1050                 entry->requested_packet = data[0];
1051
1052         entry->ac_bitmap = data[2];
1053         return BRCMF_FWS_RET_OK_SCHEDULE;
1054 }
1055
1056 static void
1057 brcmf_fws_macdesc_use_req_credit(struct brcmf_fws_mac_descriptor *entry,
1058                                  struct sk_buff *skb)
1059 {
1060         if (entry->requested_credit > 0) {
1061                 entry->requested_credit--;
1062                 brcmf_skb_if_flags_set_field(skb, REQUESTED, 1);
1063                 brcmf_skb_if_flags_set_field(skb, REQ_CREDIT, 1);
1064                 if (entry->state != BRCMF_FWS_STATE_CLOSE)
1065                         brcmf_err("requested credit set while mac not closed!\n");
1066         } else if (entry->requested_packet > 0) {
1067                 entry->requested_packet--;
1068                 brcmf_skb_if_flags_set_field(skb, REQUESTED, 1);
1069                 brcmf_skb_if_flags_set_field(skb, REQ_CREDIT, 0);
1070                 if (entry->state != BRCMF_FWS_STATE_CLOSE)
1071                         brcmf_err("requested packet set while mac not closed!\n");
1072         } else {
1073                 brcmf_skb_if_flags_set_field(skb, REQUESTED, 0);
1074                 brcmf_skb_if_flags_set_field(skb, REQ_CREDIT, 0);
1075         }
1076 }
1077
1078 static void brcmf_fws_macdesc_return_req_credit(struct sk_buff *skb)
1079 {
1080         struct brcmf_fws_mac_descriptor *entry = brcmf_skbcb(skb)->mac;
1081
1082         if ((brcmf_skb_if_flags_get_field(skb, REQ_CREDIT)) &&
1083             (entry->state == BRCMF_FWS_STATE_CLOSE))
1084                 entry->requested_credit++;
1085 }
1086
1087 static void brcmf_fws_return_credits(struct brcmf_fws_info *fws,
1088                                      u8 fifo, u8 credits)
1089 {
1090         int lender_ac;
1091         int *borrowed;
1092         int *fifo_credit;
1093
1094         if (!credits)
1095                 return;
1096
1097         fws->fifo_credit_map |= 1 << fifo;
1098
1099         if ((fifo == BRCMF_FWS_FIFO_AC_BE) &&
1100             (fws->credits_borrowed[0])) {
1101                 for (lender_ac = BRCMF_FWS_FIFO_AC_VO; lender_ac >= 0;
1102                      lender_ac--) {
1103                         borrowed = &fws->credits_borrowed[lender_ac];
1104                         if (*borrowed) {
1105                                 fws->fifo_credit_map |= (1 << lender_ac);
1106                                 fifo_credit = &fws->fifo_credit[lender_ac];
1107                                 if (*borrowed >= credits) {
1108                                         *borrowed -= credits;
1109                                         *fifo_credit += credits;
1110                                         return;
1111                                 } else {
1112                                         credits -= *borrowed;
1113                                         *fifo_credit += *borrowed;
1114                                         *borrowed = 0;
1115                                 }
1116                         }
1117                 }
1118         }
1119
1120         fws->fifo_credit[fifo] += credits;
1121 }
1122
1123 static void brcmf_fws_schedule_deq(struct brcmf_fws_info *fws)
1124 {
1125         /* only schedule dequeue when there are credits for delayed traffic */
1126         if (fws->fifo_credit_map & fws->fifo_delay_map)
1127                 queue_work(fws->fws_wq, &fws->fws_dequeue_work);
1128 }
1129
1130 static int brcmf_fws_enq(struct brcmf_fws_info *fws,
1131                          enum brcmf_fws_skb_state state, int fifo,
1132                          struct sk_buff *p)
1133 {
1134         int prec = 2 * fifo;
1135         u32 *qfull_stat = &fws->stats.delayq_full_error;
1136
1137         struct brcmf_fws_mac_descriptor *entry;
1138
1139         entry = brcmf_skbcb(p)->mac;
1140         if (entry == NULL) {
1141                 brcmf_err("no mac descriptor found for skb %p\n", p);
1142                 return -ENOENT;
1143         }
1144
1145         brcmf_dbg(DATA, "enter: fifo %d skb %p\n", fifo, p);
1146         if (state == BRCMF_FWS_SKBSTATE_SUPPRESSED) {
1147                 prec += 1;
1148                 qfull_stat = &fws->stats.supprq_full_error;
1149         }
1150
1151         if (brcmu_pktq_penq(&entry->psq, prec, p) == NULL) {
1152                 *qfull_stat += 1;
1153                 return -ENFILE;
1154         }
1155
1156         /* increment total enqueued packet count */
1157         fws->fifo_delay_map |= 1 << fifo;
1158         fws->fifo_enqpkt[fifo]++;
1159
1160         /* update the sk_buff state */
1161         brcmf_skbcb(p)->state = state;
1162
1163         /*
1164          * A packet has been pushed so update traffic
1165          * availability bitmap, if applicable
1166          */
1167         brcmf_fws_tim_update(fws, entry, fifo, true);
1168         brcmf_fws_flow_control_check(fws, &entry->psq,
1169                                      brcmf_skb_if_flags_get_field(p, INDEX));
1170         return 0;
1171 }
1172
1173 static struct sk_buff *brcmf_fws_deq(struct brcmf_fws_info *fws, int fifo)
1174 {
1175         struct brcmf_fws_mac_descriptor *table;
1176         struct brcmf_fws_mac_descriptor *entry;
1177         struct sk_buff *p;
1178         int num_nodes;
1179         int node_pos;
1180         int prec_out;
1181         int pmsk;
1182         int i;
1183
1184         table = (struct brcmf_fws_mac_descriptor *)&fws->desc;
1185         num_nodes = sizeof(fws->desc) / sizeof(struct brcmf_fws_mac_descriptor);
1186         node_pos = fws->deq_node_pos[fifo];
1187
1188         for (i = 0; i < num_nodes; i++) {
1189                 entry = &table[(node_pos + i) % num_nodes];
1190                 if (!entry->occupied ||
1191                     brcmf_fws_macdesc_closed(fws, entry, fifo))
1192                         continue;
1193
1194                 if (entry->suppressed)
1195                         pmsk = 2;
1196                 else
1197                         pmsk = 3;
1198                 p = brcmu_pktq_mdeq(&entry->psq, pmsk << (fifo * 2), &prec_out);
1199                 if (p == NULL) {
1200                         if (entry->suppressed) {
1201                                 if (entry->suppr_transit_count)
1202                                         continue;
1203                                 entry->suppressed = false;
1204                                 p = brcmu_pktq_mdeq(&entry->psq,
1205                                                     1 << (fifo * 2), &prec_out);
1206                         }
1207                 }
1208                 if  (p == NULL)
1209                         continue;
1210
1211                 brcmf_fws_macdesc_use_req_credit(entry, p);
1212
1213                 /* move dequeue position to ensure fair round-robin */
1214                 fws->deq_node_pos[fifo] = (node_pos + i + 1) % num_nodes;
1215                 brcmf_fws_flow_control_check(fws, &entry->psq,
1216                                              brcmf_skb_if_flags_get_field(p,
1217                                                                           INDEX)
1218                                              );
1219                 /*
1220                  * A packet has been picked up, update traffic
1221                  * availability bitmap, if applicable
1222                  */
1223                 brcmf_fws_tim_update(fws, entry, fifo, false);
1224
1225                 /*
1226                  * decrement total enqueued fifo packets and
1227                  * clear delay bitmap if done.
1228                  */
1229                 fws->fifo_enqpkt[fifo]--;
1230                 if (fws->fifo_enqpkt[fifo] == 0)
1231                         fws->fifo_delay_map &= ~(1 << fifo);
1232                 goto done;
1233         }
1234         p = NULL;
1235 done:
1236         brcmf_dbg(DATA, "exit: fifo %d skb %p\n", fifo, p);
1237         return p;
1238 }
1239
1240 static int brcmf_fws_txstatus_suppressed(struct brcmf_fws_info *fws, int fifo,
1241                                          struct sk_buff *skb, u32 genbit)
1242 {
1243         struct brcmf_fws_mac_descriptor *entry = brcmf_skbcb(skb)->mac;
1244         u32 hslot;
1245         int ret;
1246         u8 ifidx;
1247
1248         hslot = brcmf_skb_htod_tag_get_field(skb, HSLOT);
1249
1250         /* this packet was suppressed */
1251         if (!entry->suppressed) {
1252                 entry->suppressed = true;
1253                 entry->suppr_transit_count = entry->transit_count;
1254                 brcmf_dbg(DATA, "suppress %s: transit %d\n",
1255                           entry->name, entry->transit_count);
1256         }
1257
1258         entry->generation = genbit;
1259
1260         ret = brcmf_proto_hdrpull(fws->drvr, false, &ifidx, skb);
1261         if (ret == 0)
1262                 ret = brcmf_fws_enq(fws, BRCMF_FWS_SKBSTATE_SUPPRESSED, fifo,
1263                                     skb);
1264         if (ret != 0) {
1265                 /* suppress q is full or hdrpull failed, drop this packet */
1266                 brcmf_fws_hanger_poppkt(&fws->hanger, hslot, &skb,
1267                                         true);
1268         } else {
1269                 /*
1270                  * Mark suppressed to avoid a double free during
1271                  * wlfc cleanup
1272                  */
1273                 brcmf_fws_hanger_mark_suppressed(&fws->hanger, hslot);
1274         }
1275
1276         return ret;
1277 }
1278
1279 static int
1280 brcmf_fws_txs_process(struct brcmf_fws_info *fws, u8 flags, u32 hslot,
1281                            u32 genbit)
1282 {
1283         u32 fifo;
1284         int ret;
1285         bool remove_from_hanger = true;
1286         struct sk_buff *skb;
1287         struct brcmf_skbuff_cb *skcb;
1288         struct brcmf_fws_mac_descriptor *entry = NULL;
1289
1290         brcmf_dbg(DATA, "flags %d\n", flags);
1291
1292         if (flags == BRCMF_FWS_TXSTATUS_DISCARD)
1293                 fws->stats.txs_discard++;
1294         else if (flags == BRCMF_FWS_TXSTATUS_CORE_SUPPRESS) {
1295                 fws->stats.txs_supp_core++;
1296                 remove_from_hanger = false;
1297         } else if (flags == BRCMF_FWS_TXSTATUS_FW_PS_SUPPRESS) {
1298                 fws->stats.txs_supp_ps++;
1299                 remove_from_hanger = false;
1300         } else if (flags == BRCMF_FWS_TXSTATUS_FW_TOSSED)
1301                 fws->stats.txs_tossed++;
1302         else if (flags == BRCMF_FWS_TXSTATUS_HOST_TOSSED)
1303                 fws->stats.txs_host_tossed++;
1304         else
1305                 brcmf_err("unexpected txstatus\n");
1306
1307         ret = brcmf_fws_hanger_poppkt(&fws->hanger, hslot, &skb,
1308                                       remove_from_hanger);
1309         if (ret != 0) {
1310                 brcmf_err("no packet in hanger slot: hslot=%d\n", hslot);
1311                 return ret;
1312         }
1313
1314         skcb = brcmf_skbcb(skb);
1315         entry = skcb->mac;
1316         if (WARN_ON(!entry)) {
1317                 brcmu_pkt_buf_free_skb(skb);
1318                 return -EINVAL;
1319         }
1320         entry->transit_count--;
1321         if (entry->suppressed && entry->suppr_transit_count)
1322                 entry->suppr_transit_count--;
1323
1324         brcmf_dbg(DATA, "%s flags %X htod %X\n", entry->name, skcb->if_flags,
1325                   skcb->htod);
1326
1327         /* pick up the implicit credit from this packet */
1328         fifo = brcmf_skb_htod_tag_get_field(skb, FIFO);
1329         if ((fws->fcmode == BRCMF_FWS_FCMODE_IMPLIED_CREDIT) ||
1330             (brcmf_skb_if_flags_get_field(skb, REQ_CREDIT)) ||
1331             (flags == BRCMF_FWS_TXSTATUS_HOST_TOSSED)) {
1332                 brcmf_fws_return_credits(fws, fifo, 1);
1333                 brcmf_fws_schedule_deq(fws);
1334         }
1335         brcmf_fws_macdesc_return_req_credit(skb);
1336
1337         if (!remove_from_hanger)
1338                 ret = brcmf_fws_txstatus_suppressed(fws, fifo, skb, genbit);
1339
1340         if (remove_from_hanger || ret)
1341                 brcmf_txfinalize(fws->drvr, skb, true);
1342
1343         return 0;
1344 }
1345
1346 static int brcmf_fws_fifocreditback_indicate(struct brcmf_fws_info *fws,
1347                                              u8 *data)
1348 {
1349         int i;
1350
1351         if (fws->fcmode != BRCMF_FWS_FCMODE_EXPLICIT_CREDIT) {
1352                 brcmf_dbg(INFO, "ignored\n");
1353                 return BRCMF_FWS_RET_OK_NOSCHEDULE;
1354         }
1355
1356         brcmf_dbg(DATA, "enter: data %pM\n", data);
1357         for (i = 0; i < BRCMF_FWS_FIFO_COUNT; i++)
1358                 brcmf_fws_return_credits(fws, i, data[i]);
1359
1360         brcmf_dbg(DATA, "map: credit %x delay %x\n", fws->fifo_credit_map,
1361                   fws->fifo_delay_map);
1362         return BRCMF_FWS_RET_OK_SCHEDULE;
1363 }
1364
1365 static int brcmf_fws_txstatus_indicate(struct brcmf_fws_info *fws, u8 *data)
1366 {
1367         __le32 status_le;
1368         u32 status;
1369         u32 hslot;
1370         u32 genbit;
1371         u8 flags;
1372
1373         fws->stats.txs_indicate++;
1374         memcpy(&status_le, data, sizeof(status_le));
1375         status = le32_to_cpu(status_le);
1376         flags = brcmf_txstatus_get_field(status, FLAGS);
1377         hslot = brcmf_txstatus_get_field(status, HSLOT);
1378         genbit = brcmf_txstatus_get_field(status, GENERATION);
1379
1380         return brcmf_fws_txs_process(fws, flags, hslot, genbit);
1381 }
1382
1383 static int brcmf_fws_dbg_seqnum_check(struct brcmf_fws_info *fws, u8 *data)
1384 {
1385         __le32 timestamp;
1386
1387         memcpy(&timestamp, &data[2], sizeof(timestamp));
1388         brcmf_dbg(CTL, "received: seq %d, timestamp %d\n", data[1],
1389                   le32_to_cpu(timestamp));
1390         return 0;
1391 }
1392
1393 /* using macro so sparse checking does not complain
1394  * about locking imbalance.
1395  */
1396 #define brcmf_fws_lock(drvr, flags)                             \
1397 do {                                                            \
1398         flags = 0;                                              \
1399         spin_lock_irqsave(&((drvr)->fws_spinlock), (flags));    \
1400 } while (0)
1401
1402 /* using macro so sparse checking does not complain
1403  * about locking imbalance.
1404  */
1405 #define brcmf_fws_unlock(drvr, flags) \
1406         spin_unlock_irqrestore(&((drvr)->fws_spinlock), (flags))
1407
1408 static int brcmf_fws_notify_credit_map(struct brcmf_if *ifp,
1409                                        const struct brcmf_event_msg *e,
1410                                        void *data)
1411 {
1412         struct brcmf_fws_info *fws = ifp->drvr->fws;
1413         int i;
1414         ulong flags;
1415         u8 *credits = data;
1416
1417         if (e->datalen < BRCMF_FWS_FIFO_COUNT) {
1418                 brcmf_err("event payload too small (%d)\n", e->datalen);
1419                 return -EINVAL;
1420         }
1421         if (fws->creditmap_received)
1422                 return 0;
1423
1424         fws->creditmap_received = true;
1425
1426         brcmf_dbg(TRACE, "enter: credits %pM\n", credits);
1427         brcmf_fws_lock(ifp->drvr, flags);
1428         for (i = 0; i < ARRAY_SIZE(fws->fifo_credit); i++) {
1429                 if (*credits)
1430                         fws->fifo_credit_map |= 1 << i;
1431                 else
1432                         fws->fifo_credit_map &= ~(1 << i);
1433                 fws->fifo_credit[i] = *credits++;
1434         }
1435         brcmf_fws_schedule_deq(fws);
1436         brcmf_fws_unlock(ifp->drvr, flags);
1437         return 0;
1438 }
1439
1440 static int brcmf_fws_notify_bcmc_credit_support(struct brcmf_if *ifp,
1441                                                 const struct brcmf_event_msg *e,
1442                                                 void *data)
1443 {
1444         struct brcmf_fws_info *fws = ifp->drvr->fws;
1445         ulong flags;
1446
1447         brcmf_fws_lock(ifp->drvr, flags);
1448         if (fws)
1449                 fws->bcmc_credit_check = true;
1450         brcmf_fws_unlock(ifp->drvr, flags);
1451         return 0;
1452 }
1453
1454 int brcmf_fws_hdrpull(struct brcmf_pub *drvr, int ifidx, s16 signal_len,
1455                       struct sk_buff *skb)
1456 {
1457         struct brcmf_fws_info *fws = drvr->fws;
1458         ulong flags;
1459         u8 *signal_data;
1460         s16 data_len;
1461         u8 type;
1462         u8 len;
1463         u8 *data;
1464         s32 status;
1465         s32 err;
1466
1467         brcmf_dbg(HDRS, "enter: ifidx %d, skblen %u, sig %d\n",
1468                   ifidx, skb->len, signal_len);
1469
1470         WARN_ON(signal_len > skb->len);
1471
1472         /* if flow control disabled, skip to packet data and leave */
1473         if (!signal_len || !drvr->fw_signals) {
1474                 skb_pull(skb, signal_len);
1475                 return 0;
1476         }
1477
1478         /* lock during tlv parsing */
1479         brcmf_fws_lock(drvr, flags);
1480
1481         fws->stats.header_pulls++;
1482         data_len = signal_len;
1483         signal_data = skb->data;
1484
1485         status = BRCMF_FWS_RET_OK_NOSCHEDULE;
1486         while (data_len > 0) {
1487                 /* extract tlv info */
1488                 type = signal_data[0];
1489
1490                 /* FILLER type is actually not a TLV, but
1491                  * a single byte that can be skipped.
1492                  */
1493                 if (type == BRCMF_FWS_TYPE_FILLER) {
1494                         signal_data += 1;
1495                         data_len -= 1;
1496                         continue;
1497                 }
1498                 len = signal_data[1];
1499                 data = signal_data + 2;
1500
1501                 brcmf_dbg(HDRS, "tlv type=%s (%d), len=%d (%d)\n",
1502                           brcmf_fws_get_tlv_name(type), type, len,
1503                           brcmf_fws_get_tlv_len(fws, type));
1504
1505                 /* abort parsing when length invalid */
1506                 if (data_len < len + 2)
1507                         break;
1508
1509                 if (len < brcmf_fws_get_tlv_len(fws, type))
1510                         break;
1511
1512                 err = BRCMF_FWS_RET_OK_NOSCHEDULE;
1513                 switch (type) {
1514                 case BRCMF_FWS_TYPE_HOST_REORDER_RXPKTS:
1515                 case BRCMF_FWS_TYPE_COMP_TXSTATUS:
1516                         break;
1517                 case BRCMF_FWS_TYPE_MACDESC_ADD:
1518                 case BRCMF_FWS_TYPE_MACDESC_DEL:
1519                         brcmf_fws_macdesc_indicate(fws, type, data);
1520                         break;
1521                 case BRCMF_FWS_TYPE_MAC_OPEN:
1522                 case BRCMF_FWS_TYPE_MAC_CLOSE:
1523                         err = brcmf_fws_macdesc_state_indicate(fws, type, data);
1524                         break;
1525                 case BRCMF_FWS_TYPE_INTERFACE_OPEN:
1526                 case BRCMF_FWS_TYPE_INTERFACE_CLOSE:
1527                         err = brcmf_fws_interface_state_indicate(fws, type,
1528                                                                  data);
1529                         break;
1530                 case BRCMF_FWS_TYPE_MAC_REQUEST_CREDIT:
1531                 case BRCMF_FWS_TYPE_MAC_REQUEST_PACKET:
1532                         err = brcmf_fws_request_indicate(fws, type, data);
1533                         break;
1534                 case BRCMF_FWS_TYPE_TXSTATUS:
1535                         brcmf_fws_txstatus_indicate(fws, data);
1536                         break;
1537                 case BRCMF_FWS_TYPE_FIFO_CREDITBACK:
1538                         err = brcmf_fws_fifocreditback_indicate(fws, data);
1539                         break;
1540                 case BRCMF_FWS_TYPE_RSSI:
1541                         brcmf_fws_rssi_indicate(fws, *data);
1542                         break;
1543                 case BRCMF_FWS_TYPE_TRANS_ID:
1544                         brcmf_fws_dbg_seqnum_check(fws, data);
1545                         break;
1546                 case BRCMF_FWS_TYPE_PKTTAG:
1547                 case BRCMF_FWS_TYPE_PENDING_TRAFFIC_BMP:
1548                 default:
1549                         fws->stats.tlv_invalid_type++;
1550                         break;
1551                 }
1552                 if (err == BRCMF_FWS_RET_OK_SCHEDULE)
1553                         status = BRCMF_FWS_RET_OK_SCHEDULE;
1554                 signal_data += len + 2;
1555                 data_len -= len + 2;
1556         }
1557
1558         if (data_len != 0)
1559                 fws->stats.tlv_parse_failed++;
1560
1561         if (status == BRCMF_FWS_RET_OK_SCHEDULE)
1562                 brcmf_fws_schedule_deq(fws);
1563
1564         /* signalling processing result does
1565          * not affect the actual ethernet packet.
1566          */
1567         skb_pull(skb, signal_len);
1568
1569         /* this may be a signal-only packet
1570          */
1571         if (skb->len == 0)
1572                 fws->stats.header_only_pkt++;
1573
1574         brcmf_fws_unlock(drvr, flags);
1575         return 0;
1576 }
1577
1578 static void brcmf_fws_precommit_skb(struct brcmf_fws_info *fws, int fifo,
1579                                    struct sk_buff *p)
1580 {
1581         struct brcmf_skbuff_cb *skcb = brcmf_skbcb(p);
1582         struct brcmf_fws_mac_descriptor *entry = skcb->mac;
1583         u8 flags;
1584
1585         brcmf_skb_if_flags_set_field(p, TRANSMIT, 1);
1586         brcmf_skb_htod_tag_set_field(p, GENERATION, entry->generation);
1587         flags = BRCMF_FWS_HTOD_FLAG_PKTFROMHOST;
1588         if (brcmf_skb_if_flags_get_field(p, REQUESTED)) {
1589                 /*
1590                  * Indicate that this packet is being sent in response to an
1591                  * explicit request from the firmware side.
1592                  */
1593                 flags |= BRCMF_FWS_HTOD_FLAG_PKT_REQUESTED;
1594         }
1595         brcmf_skb_htod_tag_set_field(p, FLAGS, flags);
1596         brcmf_fws_hdrpush(fws, p);
1597 }
1598
1599 static void brcmf_fws_rollback_toq(struct brcmf_fws_info *fws,
1600                                    struct sk_buff *skb, int fifo)
1601 {
1602         struct brcmf_fws_mac_descriptor *entry;
1603         struct sk_buff *pktout;
1604         int qidx, hslot;
1605         int rc = 0;
1606
1607         entry = brcmf_skbcb(skb)->mac;
1608         if (entry->occupied) {
1609                 qidx = 2 * fifo;
1610                 if (brcmf_skbcb(skb)->state == BRCMF_FWS_SKBSTATE_SUPPRESSED)
1611                         qidx++;
1612
1613                 pktout = brcmu_pktq_penq_head(&entry->psq, qidx, skb);
1614                 if (pktout == NULL) {
1615                         brcmf_err("%s queue %d full\n", entry->name, qidx);
1616                         rc = -ENOSPC;
1617                 }
1618         } else {
1619                 brcmf_err("%s entry removed\n", entry->name);
1620                 rc = -ENOENT;
1621         }
1622
1623         if (rc) {
1624                 fws->stats.rollback_failed++;
1625                 hslot = brcmf_skb_htod_tag_get_field(skb, HSLOT);
1626                 brcmf_fws_txs_process(fws, BRCMF_FWS_TXSTATUS_HOST_TOSSED,
1627                                       hslot, 0);
1628         } else {
1629                 fws->stats.rollback_success++;
1630                 brcmf_fws_return_credits(fws, fifo, 1);
1631                 brcmf_fws_macdesc_return_req_credit(skb);
1632         }
1633 }
1634
1635 static int brcmf_fws_borrow_credit(struct brcmf_fws_info *fws)
1636 {
1637         int lender_ac;
1638
1639         if (time_after(fws->borrow_defer_timestamp, jiffies)) {
1640                 fws->fifo_credit_map &= ~(1 << BRCMF_FWS_FIFO_AC_BE);
1641                 return -ENAVAIL;
1642         }
1643
1644         for (lender_ac = 0; lender_ac <= BRCMF_FWS_FIFO_AC_VO; lender_ac++) {
1645                 if (fws->fifo_credit[lender_ac]) {
1646                         fws->credits_borrowed[lender_ac]++;
1647                         fws->fifo_credit[lender_ac]--;
1648                         if (fws->fifo_credit[lender_ac] == 0)
1649                                 fws->fifo_credit_map &= ~(1 << lender_ac);
1650                         fws->fifo_credit_map |= (1 << BRCMF_FWS_FIFO_AC_BE);
1651                         brcmf_dbg(DATA, "borrow credit from: %d\n", lender_ac);
1652                         return 0;
1653                 }
1654         }
1655         fws->fifo_credit_map &= ~(1 << BRCMF_FWS_FIFO_AC_BE);
1656         return -ENAVAIL;
1657 }
1658
1659 static int brcmf_fws_commit_skb(struct brcmf_fws_info *fws, int fifo,
1660                                 struct sk_buff *skb)
1661 {
1662         struct brcmf_skbuff_cb *skcb = brcmf_skbcb(skb);
1663         struct brcmf_fws_mac_descriptor *entry;
1664         struct brcmf_bus *bus = fws->drvr->bus_if;
1665         int rc;
1666         u8 ifidx;
1667
1668         entry = skcb->mac;
1669         if (IS_ERR(entry))
1670                 return PTR_ERR(entry);
1671
1672         brcmf_fws_precommit_skb(fws, fifo, skb);
1673         rc = brcmf_bus_txdata(bus, skb);
1674         brcmf_dbg(DATA, "%s flags %X htod %X bus_tx %d\n", entry->name,
1675                   skcb->if_flags, skcb->htod, rc);
1676         if (rc < 0) {
1677                 brcmf_proto_hdrpull(fws->drvr, false, &ifidx, skb);
1678                 goto rollback;
1679         }
1680
1681         entry->transit_count++;
1682         if (entry->suppressed)
1683                 entry->suppr_transit_count++;
1684         fws->stats.pkt2bus++;
1685         fws->stats.send_pkts[fifo]++;
1686         if (brcmf_skb_if_flags_get_field(skb, REQUESTED))
1687                 fws->stats.requested_sent[fifo]++;
1688
1689         return rc;
1690
1691 rollback:
1692         brcmf_fws_rollback_toq(fws, skb, fifo);
1693         return rc;
1694 }
1695
1696 static int brcmf_fws_assign_htod(struct brcmf_fws_info *fws, struct sk_buff *p,
1697                                   int fifo)
1698 {
1699         struct brcmf_skbuff_cb *skcb = brcmf_skbcb(p);
1700         int rc, hslot;
1701
1702         hslot = brcmf_fws_hanger_get_free_slot(&fws->hanger);
1703         brcmf_skb_htod_tag_set_field(p, HSLOT, hslot);
1704         brcmf_skb_htod_tag_set_field(p, FREERUN, skcb->mac->seq[fifo]);
1705         brcmf_skb_htod_tag_set_field(p, FIFO, fifo);
1706         rc = brcmf_fws_hanger_pushpkt(&fws->hanger, p, hslot);
1707         if (!rc)
1708                 skcb->mac->seq[fifo]++;
1709         else
1710                 fws->stats.generic_error++;
1711         return rc;
1712 }
1713
1714 int brcmf_fws_process_skb(struct brcmf_if *ifp, struct sk_buff *skb)
1715 {
1716         struct brcmf_pub *drvr = ifp->drvr;
1717         struct brcmf_fws_info *fws = drvr->fws;
1718         struct brcmf_skbuff_cb *skcb = brcmf_skbcb(skb);
1719         struct ethhdr *eh = (struct ethhdr *)(skb->data);
1720         ulong flags;
1721         int fifo = BRCMF_FWS_FIFO_BCMC;
1722         bool multicast = is_multicast_ether_addr(eh->h_dest);
1723
1724         /* determine the priority */
1725         if (!skb->priority)
1726                 skb->priority = cfg80211_classify8021d(skb);
1727
1728         drvr->tx_multicast += !!multicast;
1729         if (ntohs(eh->h_proto) == ETH_P_PAE)
1730                 atomic_inc(&ifp->pend_8021x_cnt);
1731
1732         if (!brcmf_fws_fc_active(fws)) {
1733                 /* If the protocol uses a data header, apply it */
1734                 brcmf_proto_hdrpush(drvr, ifp->ifidx, 0, skb);
1735
1736                 /* Use bus module to send data frame */
1737                 return brcmf_bus_txdata(drvr->bus_if, skb);
1738         }
1739
1740         /* set control buffer information */
1741         skcb->if_flags = 0;
1742         skcb->state = BRCMF_FWS_SKBSTATE_NEW;
1743         brcmf_skb_if_flags_set_field(skb, INDEX, ifp->ifidx);
1744         if (!multicast)
1745                 fifo = brcmf_fws_prio2fifo[skb->priority];
1746
1747         brcmf_fws_lock(drvr, flags);
1748         if (fifo != BRCMF_FWS_FIFO_AC_BE && fifo < BRCMF_FWS_FIFO_BCMC)
1749                 fws->borrow_defer_timestamp = jiffies +
1750                                               BRCMF_FWS_BORROW_DEFER_PERIOD;
1751
1752         skcb->mac = brcmf_fws_macdesc_find(fws, ifp, eh->h_dest);
1753         brcmf_dbg(DATA, "%s mac %pM multi %d fifo %d\n", skcb->mac->name,
1754                   eh->h_dest, multicast, fifo);
1755         if (!brcmf_fws_assign_htod(fws, skb, fifo)) {
1756                 brcmf_fws_enq(fws, BRCMF_FWS_SKBSTATE_DELAYED, fifo, skb);
1757                 brcmf_fws_schedule_deq(fws);
1758         } else {
1759                 brcmf_err("drop skb: no hanger slot\n");
1760                 brcmu_pkt_buf_free_skb(skb);
1761         }
1762         brcmf_fws_unlock(drvr, flags);
1763         return 0;
1764 }
1765
1766 void brcmf_fws_reset_interface(struct brcmf_if *ifp)
1767 {
1768         struct brcmf_fws_mac_descriptor *entry = ifp->fws_desc;
1769
1770         brcmf_dbg(TRACE, "enter: idx=%d\n", ifp->bssidx);
1771         if (!entry)
1772                 return;
1773
1774         brcmf_fws_macdesc_init(entry, ifp->mac_addr, ifp->ifidx);
1775 }
1776
1777 void brcmf_fws_add_interface(struct brcmf_if *ifp)
1778 {
1779         struct brcmf_fws_info *fws = ifp->drvr->fws;
1780         struct brcmf_fws_mac_descriptor *entry;
1781
1782         if (!ifp->ndev || !ifp->drvr->fw_signals)
1783                 return;
1784
1785         entry = &fws->desc.iface[ifp->ifidx];
1786         ifp->fws_desc = entry;
1787         brcmf_fws_macdesc_init(entry, ifp->mac_addr, ifp->ifidx);
1788         brcmf_fws_macdesc_set_name(fws, entry);
1789         brcmu_pktq_init(&entry->psq, BRCMF_FWS_PSQ_PREC_COUNT,
1790                         BRCMF_FWS_PSQ_LEN);
1791         brcmf_dbg(TRACE, "added %s\n", entry->name);
1792 }
1793
1794 void brcmf_fws_del_interface(struct brcmf_if *ifp)
1795 {
1796         struct brcmf_fws_mac_descriptor *entry = ifp->fws_desc;
1797         ulong flags;
1798
1799         if (!entry)
1800                 return;
1801
1802         brcmf_fws_lock(ifp->drvr, flags);
1803         ifp->fws_desc = NULL;
1804         brcmf_dbg(TRACE, "deleting %s\n", entry->name);
1805         brcmf_fws_macdesc_deinit(entry);
1806         brcmf_fws_cleanup(ifp->drvr->fws, ifp->ifidx);
1807         brcmf_fws_unlock(ifp->drvr, flags);
1808 }
1809
1810 static void brcmf_fws_dequeue_worker(struct work_struct *worker)
1811 {
1812         struct brcmf_fws_info *fws;
1813         struct sk_buff *skb;
1814         ulong flags;
1815         int fifo;
1816
1817         fws = container_of(worker, struct brcmf_fws_info, fws_dequeue_work);
1818
1819         brcmf_fws_lock(fws->drvr, flags);
1820         for (fifo = BRCMF_FWS_FIFO_BCMC; fifo >= 0 && !fws->bus_flow_blocked;
1821              fifo--) {
1822                 while ((fws->fifo_credit[fifo]) || ((!fws->bcmc_credit_check) &&
1823                        (fifo == BRCMF_FWS_FIFO_BCMC))) {
1824                         skb = brcmf_fws_deq(fws, fifo);
1825                         if (!skb)
1826                                 break;
1827                         fws->fifo_credit[fifo]--;
1828                         if (brcmf_fws_commit_skb(fws, fifo, skb))
1829                                 break;
1830                         if (fws->bus_flow_blocked)
1831                                 break;
1832                 }
1833                 if ((fifo == BRCMF_FWS_FIFO_AC_BE) &&
1834                     (fws->fifo_credit[fifo] == 0) &&
1835                     (!fws->bus_flow_blocked)) {
1836                         while (brcmf_fws_borrow_credit(fws) == 0) {
1837                                 skb = brcmf_fws_deq(fws, fifo);
1838                                 if (!skb) {
1839                                         brcmf_fws_return_credits(fws, fifo, 1);
1840                                         break;
1841                                 }
1842                                 if (brcmf_fws_commit_skb(fws, fifo, skb))
1843                                         break;
1844                                 if (fws->bus_flow_blocked)
1845                                         break;
1846                         }
1847                 }
1848         }
1849         brcmf_fws_unlock(fws->drvr, flags);
1850 }
1851
1852 int brcmf_fws_init(struct brcmf_pub *drvr)
1853 {
1854         u32 tlv = BRCMF_FWS_FLAGS_RSSI_SIGNALS;
1855         int rc;
1856
1857         if (!drvr->fw_signals)
1858                 return 0;
1859
1860         spin_lock_init(&drvr->fws_spinlock);
1861
1862         drvr->fws = kzalloc(sizeof(*(drvr->fws)), GFP_KERNEL);
1863         if (!drvr->fws) {
1864                 rc = -ENOMEM;
1865                 goto fail;
1866         }
1867
1868         /* set linkage back */
1869         drvr->fws->drvr = drvr;
1870         drvr->fws->fcmode = fcmode;
1871
1872         drvr->fws->fws_wq = create_singlethread_workqueue("brcmf_fws_wq");
1873         if (drvr->fws->fws_wq == NULL) {
1874                 brcmf_err("workqueue creation failed\n");
1875                 rc = -EBADF;
1876                 goto fail;
1877         }
1878         INIT_WORK(&drvr->fws->fws_dequeue_work, brcmf_fws_dequeue_worker);
1879
1880         /* enable firmware signalling if fcmode active */
1881         if (drvr->fws->fcmode != BRCMF_FWS_FCMODE_NONE)
1882                 tlv |= BRCMF_FWS_FLAGS_XONXOFF_SIGNALS |
1883                        BRCMF_FWS_FLAGS_CREDIT_STATUS_SIGNALS |
1884                        BRCMF_FWS_FLAGS_HOST_PROPTXSTATUS_ACTIVE;
1885
1886         rc = brcmf_fweh_register(drvr, BRCMF_E_FIFO_CREDIT_MAP,
1887                                  brcmf_fws_notify_credit_map);
1888         if (rc < 0) {
1889                 brcmf_err("register credit map handler failed\n");
1890                 goto fail;
1891         }
1892         rc = brcmf_fweh_register(drvr, BRCMF_E_BCMC_CREDIT_SUPPORT,
1893                                  brcmf_fws_notify_bcmc_credit_support);
1894         if (rc < 0) {
1895                 brcmf_err("register bcmc credit handler failed\n");
1896                 brcmf_fweh_unregister(drvr, BRCMF_E_FIFO_CREDIT_MAP);
1897                 goto fail;
1898         }
1899
1900         /* setting the iovar may fail if feature is unsupported
1901          * so leave the rc as is so driver initialization can
1902          * continue.
1903          */
1904         if (brcmf_fil_iovar_int_set(drvr->iflist[0], "tlv", tlv)) {
1905                 brcmf_err("failed to set bdcv2 tlv signaling\n");
1906                 goto fail_event;
1907         }
1908
1909         brcmf_fws_hanger_init(&drvr->fws->hanger);
1910         brcmf_fws_macdesc_init(&drvr->fws->desc.other, NULL, 0);
1911         brcmf_fws_macdesc_set_name(drvr->fws, &drvr->fws->desc.other);
1912         brcmu_pktq_init(&drvr->fws->desc.other.psq, BRCMF_FWS_PSQ_PREC_COUNT,
1913                         BRCMF_FWS_PSQ_LEN);
1914
1915         /* create debugfs file for statistics */
1916         brcmf_debugfs_create_fws_stats(drvr, &drvr->fws->stats);
1917
1918         brcmf_dbg(INFO, "%s bdcv2 tlv signaling [%x]\n",
1919                   drvr->fw_signals ? "enabled" : "disabled", tlv);
1920         return 0;
1921
1922 fail_event:
1923         brcmf_fweh_unregister(drvr, BRCMF_E_BCMC_CREDIT_SUPPORT);
1924         brcmf_fweh_unregister(drvr, BRCMF_E_FIFO_CREDIT_MAP);
1925 fail:
1926         brcmf_fws_deinit(drvr);
1927         return rc;
1928 }
1929
1930 void brcmf_fws_deinit(struct brcmf_pub *drvr)
1931 {
1932         struct brcmf_fws_info *fws = drvr->fws;
1933         ulong flags;
1934
1935         if (!fws)
1936                 return;
1937
1938         /* disable firmware signalling entirely
1939          * to avoid using the workqueue.
1940          */
1941         drvr->fw_signals = false;
1942
1943         if (drvr->fws->fws_wq)
1944                 destroy_workqueue(drvr->fws->fws_wq);
1945
1946         /* cleanup */
1947         brcmf_fws_lock(drvr, flags);
1948         brcmf_fws_cleanup(fws, -1);
1949         drvr->fws = NULL;
1950         brcmf_fws_unlock(drvr, flags);
1951
1952         /* free top structure */
1953         kfree(fws);
1954 }
1955
1956 bool brcmf_fws_fc_active(struct brcmf_fws_info *fws)
1957 {
1958         if (!fws)
1959                 return false;
1960
1961         return fws->fcmode != BRCMF_FWS_FCMODE_NONE;
1962 }
1963
1964 void brcmf_fws_bustxfail(struct brcmf_fws_info *fws, struct sk_buff *skb)
1965 {
1966         ulong flags;
1967         u32 hslot;
1968
1969         if (brcmf_skbcb(skb)->state == BRCMF_FWS_SKBSTATE_TIM) {
1970                 brcmu_pkt_buf_free_skb(skb);
1971                 return;
1972         }
1973         brcmf_fws_lock(fws->drvr, flags);
1974         hslot = brcmf_skb_htod_tag_get_field(skb, HSLOT);
1975         brcmf_fws_txs_process(fws, BRCMF_FWS_TXSTATUS_HOST_TOSSED, hslot, 0);
1976         brcmf_fws_unlock(fws->drvr, flags);
1977 }
1978
1979 void brcmf_fws_bus_blocked(struct brcmf_pub *drvr, bool flow_blocked)
1980 {
1981         struct brcmf_fws_info *fws = drvr->fws;
1982
1983         fws->bus_flow_blocked = flow_blocked;
1984         if (!flow_blocked)
1985                 brcmf_fws_schedule_deq(fws);
1986         else
1987                 fws->stats.bus_flow_block++;
1988 }