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: %s, idx=%d pkttag=0x%08X, hslot=%d\n",
 800                   entry->name, brcmf_skb_if_flags_get_field(skb, INDEX),
 801                   le32_to_cpu(pkttag), (le32_to_cpu(pkttag) >> 8) & 0xffff);
 802         if (entry->send_tim_signal)
 803                 data_offset += 2 + BRCMF_FWS_TYPE_PENDING_TRAFFIC_BMP_LEN;
 804
 805         /* +2 is for Type[1] and Len[1] in TLV, plus TIM signal */
 806         data_offset += 2 + BRCMF_FWS_TYPE_PKTTAG_LEN;
 807         fillers = round_up(data_offset, 4) - data_offset;
 808         data_offset += fillers;
 809
 810         skb_push(skb, data_offset);
 811         wlh = skb->data;
 812
 813         wlh[0] = BRCMF_FWS_TYPE_PKTTAG;
 814         wlh[1] = BRCMF_FWS_TYPE_PKTTAG_LEN;
 815         memcpy(&wlh[2], &pkttag, sizeof(pkttag));
 816         wlh += BRCMF_FWS_TYPE_PKTTAG_LEN + 2;
 817
 818         if (entry->send_tim_signal) {
 819                 entry->send_tim_signal = 0;
 820                 wlh[0] = BRCMF_FWS_TYPE_PENDING_TRAFFIC_BMP;
 821                 wlh[1] = BRCMF_FWS_TYPE_PENDING_TRAFFIC_BMP_LEN;
 822                 wlh[2] = entry->mac_handle;
 823                 wlh[3] = entry->traffic_pending_bmp;
 824                 brcmf_dbg(TRACE, "adding TIM info: handle %d bmp 0x%X\n",
 825                           entry->mac_handle, entry->traffic_pending_bmp);
 826                 wlh += BRCMF_FWS_TYPE_PENDING_TRAFFIC_BMP_LEN + 2;
 827                 entry->traffic_lastreported_bmp = entry->traffic_pending_bmp;
 828         }
 829         if (fillers)
 830                 memset(wlh, BRCMF_FWS_TYPE_FILLER, fillers);
 831
 832         brcmf_proto_hdrpush(fws->drvr, brcmf_skb_if_flags_get_field(skb, INDEX),
 833                             data_offset >> 2, skb);
 834         return 0;
 835 }
 836
 837 static bool brcmf_fws_tim_update(struct brcmf_fws_info *fws,
 838                                  struct brcmf_fws_mac_descriptor *entry,
 839                                  int fifo, bool send_immediately)
 840 {
 841         struct sk_buff *skb;
 842         struct brcmf_bus *bus;
 843         struct brcmf_skbuff_cb *skcb;
 844         s32 err;
 845         u32 len;
 846
 847         /* check delayedQ and suppressQ in one call using bitmap */
 848         if (brcmu_pktq_mlen(&entry->psq, 3 << (fifo * 2)) == 0)
 849                 entry->traffic_pending_bmp &= ~NBITVAL(fifo);
 850         else
 851                 entry->traffic_pending_bmp |= NBITVAL(fifo);
 852
 853         entry->send_tim_signal = false;
 854         if (entry->traffic_lastreported_bmp != entry->traffic_pending_bmp)
 855                 entry->send_tim_signal = true;
 856         if (send_immediately && entry->send_tim_signal &&
 857             entry->state == BRCMF_FWS_STATE_CLOSE) {
 858                 /* create a dummy packet and sent that. The traffic          */
 859                 /* bitmap info will automatically be attached to that packet */
 860                 len = BRCMF_FWS_TYPE_PKTTAG_LEN + 2 +
 861                       BRCMF_FWS_TYPE_PENDING_TRAFFIC_BMP_LEN + 2 +
 862                       4 + fws->drvr->hdrlen;
 863                 skb = brcmu_pkt_buf_get_skb(len);
 864                 if (skb == NULL)
 865                         return false;
 866                 skb_pull(skb, len);
 867                 skcb = brcmf_skbcb(skb);
 868                 skcb->mac = entry;
 869                 skcb->state = BRCMF_FWS_SKBSTATE_TIM;
 870                 bus = fws->drvr->bus_if;
 871                 err = brcmf_fws_hdrpush(fws, skb);
 872                 if (err == 0)
 873                         err = brcmf_bus_txdata(bus, skb);
 874                 if (err)
 875                         brcmu_pkt_buf_free_skb(skb);
 876                 return true;
 877         }
 878         return false;
 879 }
 880
 881 static void
 882 brcmf_fws_flow_control_check(struct brcmf_fws_info *fws, struct pktq *pq,
 883                              u8 if_id)
 884 {
 885         struct brcmf_if *ifp = fws->drvr->iflist[!if_id ? 0 : if_id + 1];
 886
 887         if (WARN_ON(!ifp))
 888                 return;
 889
 890         if ((ifp->netif_stop & BRCMF_NETIF_STOP_REASON_FWS_FC) &&
 891             pq->len <= BRCMF_FWS_FLOWCONTROL_LOWATER)
 892                 brcmf_txflowblock_if(ifp,
 893                                      BRCMF_NETIF_STOP_REASON_FWS_FC, false);
 894         if (!(ifp->netif_stop & BRCMF_NETIF_STOP_REASON_FWS_FC) &&
 895             pq->len >= BRCMF_FWS_FLOWCONTROL_HIWATER) {
 896                 fws->stats.fws_flow_block++;
 897                 brcmf_txflowblock_if(ifp, BRCMF_NETIF_STOP_REASON_FWS_FC, true);
 898         }
 899         return;
 900 }
 901
 902 static int brcmf_fws_rssi_indicate(struct brcmf_fws_info *fws, s8 rssi)
 903 {
 904         brcmf_dbg(CTL, "rssi %d\n", rssi);
 905         return 0;
 906 }
 907
 908 /* using macro so sparse checking does not complain
 909  * about locking imbalance.
 910  */
 911 #define brcmf_fws_lock(drvr, flags)                             \
 912 do {                                                            \
 913         flags = 0;                                              \
 914         spin_lock_irqsave(&((drvr)->fws_spinlock), (flags));    \
 915 } while (0)
 916
 917 /* using macro so sparse checking does not complain
 918  * about locking imbalance.
 919  */
 920 #define brcmf_fws_unlock(drvr, flags) \
 921         spin_unlock_irqrestore(&((drvr)->fws_spinlock), (flags))
 922
 923 static
 924 int brcmf_fws_macdesc_indicate(struct brcmf_fws_info *fws, u8 type, u8 *data)
 925 {
 926         struct brcmf_fws_mac_descriptor *entry, *existing;
 927         ulong flags;
 928         u8 mac_handle;
 929         u8 ifidx;
 930         u8 *addr;
 931
 932         mac_handle = *data++;
 933         ifidx = *data++;
 934         addr = data;
 935
 936         entry = &fws->desc.nodes[mac_handle & 0x1F];
 937         if (type == BRCMF_FWS_TYPE_MACDESC_DEL) {
 938                 if (entry->occupied) {
 939                         brcmf_dbg(TRACE, "deleting %s mac %pM\n",
 940                                   entry->name, addr);
 941                         brcmf_fws_lock(fws->drvr, flags);
 942                         brcmf_fws_macdesc_cleanup(fws, entry, -1);
 943                         brcmf_fws_macdesc_deinit(entry);
 944                         brcmf_fws_unlock(fws->drvr, flags);
 945                 } else
 946                         fws->stats.mac_update_failed++;
 947                 return 0;
 948         }
 949
 950         existing = brcmf_fws_macdesc_lookup(fws, addr);
 951         if (IS_ERR(existing)) {
 952                 if (!entry->occupied) {
 953                         brcmf_fws_lock(fws->drvr, flags);
 954                         entry->mac_handle = mac_handle;
 955                         brcmf_fws_macdesc_init(entry, addr, ifidx);
 956                         brcmf_fws_macdesc_set_name(fws, entry);
 957                         brcmu_pktq_init(&entry->psq, BRCMF_FWS_PSQ_PREC_COUNT,
 958                                         BRCMF_FWS_PSQ_LEN);
 959                         brcmf_fws_unlock(fws->drvr, flags);
 960                         brcmf_dbg(TRACE, "add %s mac %pM\n", entry->name, addr);
 961                 } else {
 962                         fws->stats.mac_update_failed++;
 963                 }
 964         } else {
 965                 if (entry != existing) {
 966                         brcmf_dbg(TRACE, "copy mac %s\n", existing->name);
 967                         brcmf_fws_lock(fws->drvr, flags);
 968                         memcpy(entry, existing,
 969                                offsetof(struct brcmf_fws_mac_descriptor, psq));
 970                         entry->mac_handle = mac_handle;
 971                         brcmf_fws_macdesc_deinit(existing);
 972                         brcmf_fws_macdesc_set_name(fws, entry);
 973                         brcmf_fws_unlock(fws->drvr, flags);
 974                         brcmf_dbg(TRACE, "relocate %s mac %pM\n", entry->name,
 975                                   addr);
 976                 } else {
 977                         brcmf_dbg(TRACE, "use existing\n");
 978                         WARN_ON(entry->mac_handle != mac_handle);
 979                         /* TODO: what should we do here: continue, reinit, .. */
 980                 }
 981         }
 982         return 0;
 983 }
 984
 985 static int brcmf_fws_macdesc_state_indicate(struct brcmf_fws_info *fws,
 986                                             u8 type, u8 *data)
 987 {
 988         struct brcmf_fws_mac_descriptor *entry;
 989         ulong flags;
 990         u8 mac_handle;
 991         int ret;
 992
 993         mac_handle = data[0];
 994         entry = &fws->desc.nodes[mac_handle & 0x1F];
 995         if (!entry->occupied) {
 996                 fws->stats.mac_ps_update_failed++;
 997                 return -ESRCH;
 998         }
 999         brcmf_fws_lock(fws->drvr, flags);
1000         /* a state update should wipe old credits */
1001         entry->requested_credit = 0;
1002         entry->requested_packet = 0;
1003         if (type == BRCMF_FWS_TYPE_MAC_OPEN) {
1004                 entry->state = BRCMF_FWS_STATE_OPEN;
1005                 ret = BRCMF_FWS_RET_OK_SCHEDULE;
1006         } else {
1007                 entry->state = BRCMF_FWS_STATE_CLOSE;
1008                 brcmf_fws_tim_update(fws, entry, BRCMF_FWS_FIFO_AC_BK, false);
1009                 brcmf_fws_tim_update(fws, entry, BRCMF_FWS_FIFO_AC_BE, false);
1010                 brcmf_fws_tim_update(fws, entry, BRCMF_FWS_FIFO_AC_VI, false);
1011                 brcmf_fws_tim_update(fws, entry, BRCMF_FWS_FIFO_AC_VO, true);
1012                 ret = BRCMF_FWS_RET_OK_NOSCHEDULE;
1013         }
1014         brcmf_fws_unlock(fws->drvr, flags);
1015         return ret;
1016 }
1017
1018 static int brcmf_fws_interface_state_indicate(struct brcmf_fws_info *fws,
1019                                               u8 type, u8 *data)
1020 {
1021         struct brcmf_fws_mac_descriptor *entry;
1022         ulong flags;
1023         u8 ifidx;
1024         int ret;
1025
1026         ifidx = data[0];
1027
1028         if (ifidx >= BRCMF_MAX_IFS) {
1029                 ret = -ERANGE;
1030                 goto fail;
1031         }
1032
1033         entry = &fws->desc.iface[ifidx];
1034         if (!entry->occupied) {
1035                 ret = -ESRCH;
1036                 goto fail;
1037         }
1038
1039         brcmf_dbg(TRACE, "%s (%d): %s\n", brcmf_fws_get_tlv_name(type), type,
1040                   entry->name);
1041         brcmf_fws_lock(fws->drvr, flags);
1042         switch (type) {
1043         case BRCMF_FWS_TYPE_INTERFACE_OPEN:
1044                 entry->state = BRCMF_FWS_STATE_OPEN;
1045                 ret = BRCMF_FWS_RET_OK_SCHEDULE;
1046                 break;
1047         case BRCMF_FWS_TYPE_INTERFACE_CLOSE:
1048                 entry->state = BRCMF_FWS_STATE_CLOSE;
1049                 ret = BRCMF_FWS_RET_OK_NOSCHEDULE;
1050                 break;
1051         default:
1052                 ret = -EINVAL;
1053                 brcmf_fws_unlock(fws->drvr, flags);
1054                 goto fail;
1055         }
1056         brcmf_fws_unlock(fws->drvr, flags);
1057         return ret;
1058
1059 fail:
1060         fws->stats.if_update_failed++;
1061         return ret;
1062 }
1063
1064 static int brcmf_fws_request_indicate(struct brcmf_fws_info *fws, u8 type,
1065                                       u8 *data)
1066 {
1067         struct brcmf_fws_mac_descriptor *entry;
1068         ulong flags;
1069
1070         entry = &fws->desc.nodes[data[1] & 0x1F];
1071         if (!entry->occupied) {
1072                 if (type == BRCMF_FWS_TYPE_MAC_REQUEST_CREDIT)
1073                         fws->stats.credit_request_failed++;
1074                 else
1075                         fws->stats.packet_request_failed++;
1076                 return -ESRCH;
1077         }
1078
1079         brcmf_dbg(TRACE, "%s (%d): %s cnt %d bmp %d\n",
1080                   brcmf_fws_get_tlv_name(type), type, entry->name,
1081                   data[0], data[2]);
1082         brcmf_fws_lock(fws->drvr, flags);
1083         if (type == BRCMF_FWS_TYPE_MAC_REQUEST_CREDIT)
1084                 entry->requested_credit = data[0];
1085         else
1086                 entry->requested_packet = data[0];
1087
1088         entry->ac_bitmap = data[2];
1089         brcmf_fws_unlock(fws->drvr, flags);
1090         return BRCMF_FWS_RET_OK_SCHEDULE;
1091 }
1092
1093 static void
1094 brcmf_fws_macdesc_use_req_credit(struct brcmf_fws_mac_descriptor *entry,
1095                                  struct sk_buff *skb)
1096 {
1097         if (entry->requested_credit > 0) {
1098                 entry->requested_credit--;
1099                 brcmf_skb_if_flags_set_field(skb, REQUESTED, 1);
1100                 brcmf_skb_if_flags_set_field(skb, REQ_CREDIT, 1);
1101                 if (entry->state != BRCMF_FWS_STATE_CLOSE)
1102                         brcmf_err("requested credit set while mac not closed!\n");
1103         } else if (entry->requested_packet > 0) {
1104                 entry->requested_packet--;
1105                 brcmf_skb_if_flags_set_field(skb, REQUESTED, 1);
1106                 brcmf_skb_if_flags_set_field(skb, REQ_CREDIT, 0);
1107                 if (entry->state != BRCMF_FWS_STATE_CLOSE)
1108                         brcmf_err("requested packet set while mac not closed!\n");
1109         } else {
1110                 brcmf_skb_if_flags_set_field(skb, REQUESTED, 0);
1111                 brcmf_skb_if_flags_set_field(skb, REQ_CREDIT, 0);
1112         }
1113 }
1114
1115 static void brcmf_fws_macdesc_return_req_credit(struct sk_buff *skb)
1116 {
1117         struct brcmf_fws_mac_descriptor *entry = brcmf_skbcb(skb)->mac;
1118
1119         if ((brcmf_skb_if_flags_get_field(skb, REQ_CREDIT)) &&
1120             (entry->state == BRCMF_FWS_STATE_CLOSE))
1121                 entry->requested_credit++;
1122 }
1123
1124 static void brcmf_fws_return_credits(struct brcmf_fws_info *fws,
1125                                      u8 fifo, u8 credits)
1126 {
1127         int lender_ac;
1128         int *borrowed;
1129         int *fifo_credit;
1130
1131         if (!credits)
1132                 return;
1133
1134         fws->fifo_credit_map |= 1 << fifo;
1135
1136         if ((fifo == BRCMF_FWS_FIFO_AC_BE) &&
1137             (fws->credits_borrowed[0])) {
1138                 for (lender_ac = BRCMF_FWS_FIFO_AC_VO; lender_ac >= 0;
1139                      lender_ac--) {
1140                         borrowed = &fws->credits_borrowed[lender_ac];
1141                         if (*borrowed) {
1142                                 fws->fifo_credit_map |= (1 << lender_ac);
1143                                 fifo_credit = &fws->fifo_credit[lender_ac];
1144                                 if (*borrowed >= credits) {
1145                                         *borrowed -= credits;
1146                                         *fifo_credit += credits;
1147                                         return;
1148                                 } else {
1149                                         credits -= *borrowed;
1150                                         *fifo_credit += *borrowed;
1151                                         *borrowed = 0;
1152                                 }
1153                         }
1154                 }
1155         }
1156
1157         fws->fifo_credit[fifo] += credits;
1158 }
1159
1160 static void brcmf_fws_schedule_deq(struct brcmf_fws_info *fws)
1161 {
1162         /* only schedule dequeue when there are credits for delayed traffic */
1163         if (fws->fifo_credit_map & fws->fifo_delay_map)
1164                 queue_work(fws->fws_wq, &fws->fws_dequeue_work);
1165 }
1166
1167 static int brcmf_fws_enq(struct brcmf_fws_info *fws,
1168                          enum brcmf_fws_skb_state state, int fifo,
1169                          struct sk_buff *p)
1170 {
1171         int prec = 2 * fifo;
1172         u32 *qfull_stat = &fws->stats.delayq_full_error;
1173
1174         struct brcmf_fws_mac_descriptor *entry;
1175
1176         entry = brcmf_skbcb(p)->mac;
1177         if (entry == NULL) {
1178                 brcmf_err("no mac descriptor found for skb %p\n", p);
1179                 return -ENOENT;
1180         }
1181
1182         brcmf_dbg(DATA, "enter: fifo %d skb %p\n", fifo, p);
1183         if (state == BRCMF_FWS_SKBSTATE_SUPPRESSED) {
1184                 prec += 1;
1185                 qfull_stat = &fws->stats.supprq_full_error;
1186         }
1187
1188         if (brcmu_pktq_penq(&entry->psq, prec, p) == NULL) {
1189                 *qfull_stat += 1;
1190                 return -ENFILE;
1191         }
1192
1193         /* increment total enqueued packet count */
1194         fws->fifo_delay_map |= 1 << fifo;
1195         fws->fifo_enqpkt[fifo]++;
1196
1197         /* update the sk_buff state */
1198         brcmf_skbcb(p)->state = state;
1199
1200         /*
1201          * A packet has been pushed so update traffic
1202          * availability bitmap, if applicable
1203          */
1204         brcmf_fws_tim_update(fws, entry, fifo, true);
1205         brcmf_fws_flow_control_check(fws, &entry->psq,
1206                                      brcmf_skb_if_flags_get_field(p, INDEX));
1207         return 0;
1208 }
1209
1210 static struct sk_buff *brcmf_fws_deq(struct brcmf_fws_info *fws, int fifo)
1211 {
1212         struct brcmf_fws_mac_descriptor *table;
1213         struct brcmf_fws_mac_descriptor *entry;
1214         struct sk_buff *p;
1215         int num_nodes;
1216         int node_pos;
1217         int prec_out;
1218         int pmsk;
1219         int i;
1220
1221         table = (struct brcmf_fws_mac_descriptor *)&fws->desc;
1222         num_nodes = sizeof(fws->desc) / sizeof(struct brcmf_fws_mac_descriptor);
1223         node_pos = fws->deq_node_pos[fifo];
1224
1225         for (i = 0; i < num_nodes; i++) {
1226                 entry = &table[(node_pos + i) % num_nodes];
1227                 if (!entry->occupied ||
1228                     brcmf_fws_macdesc_closed(fws, entry, fifo))
1229                         continue;
1230
1231                 if (entry->suppressed)
1232                         pmsk = 2;
1233                 else
1234                         pmsk = 3;
1235                 p = brcmu_pktq_mdeq(&entry->psq, pmsk << (fifo * 2), &prec_out);
1236                 if (p == NULL) {
1237                         if (entry->suppressed) {
1238                                 if (entry->suppr_transit_count)
1239                                         continue;
1240                                 entry->suppressed = false;
1241                                 p = brcmu_pktq_mdeq(&entry->psq,
1242                                                     1 << (fifo * 2), &prec_out);
1243                         }
1244                 }
1245                 if  (p == NULL)
1246                         continue;
1247
1248                 brcmf_fws_macdesc_use_req_credit(entry, p);
1249
1250                 /* move dequeue position to ensure fair round-robin */
1251                 fws->deq_node_pos[fifo] = (node_pos + i + 1) % num_nodes;
1252                 brcmf_fws_flow_control_check(fws, &entry->psq,
1253                                              brcmf_skb_if_flags_get_field(p,
1254                                                                           INDEX)
1255                                              );
1256                 /*
1257                  * A packet has been picked up, update traffic
1258                  * availability bitmap, if applicable
1259                  */
1260                 brcmf_fws_tim_update(fws, entry, fifo, false);
1261
1262                 /*
1263                  * decrement total enqueued fifo packets and
1264                  * clear delay bitmap if done.
1265                  */
1266                 fws->fifo_enqpkt[fifo]--;
1267                 if (fws->fifo_enqpkt[fifo] == 0)
1268                         fws->fifo_delay_map &= ~(1 << fifo);
1269                 goto done;
1270         }
1271         p = NULL;
1272 done:
1273         brcmf_dbg(DATA, "exit: fifo %d skb %p\n", fifo, p);
1274         return p;
1275 }
1276
1277 static int brcmf_fws_txstatus_suppressed(struct brcmf_fws_info *fws, int fifo,
1278                                          struct sk_buff *skb, u32 genbit)
1279 {
1280         struct brcmf_fws_mac_descriptor *entry = brcmf_skbcb(skb)->mac;
1281         u32 hslot;
1282         int ret;
1283         u8 ifidx;
1284
1285         hslot = brcmf_skb_htod_tag_get_field(skb, HSLOT);
1286
1287         /* this packet was suppressed */
1288         if (!entry->suppressed) {
1289                 entry->suppressed = true;
1290                 entry->suppr_transit_count = entry->transit_count;
1291                 brcmf_dbg(DATA, "suppress %s: transit %d\n",
1292                           entry->name, entry->transit_count);
1293         }
1294
1295         entry->generation = genbit;
1296
1297         ret = brcmf_proto_hdrpull(fws->drvr, false, &ifidx, skb);
1298         if (ret == 0)
1299                 ret = brcmf_fws_enq(fws, BRCMF_FWS_SKBSTATE_SUPPRESSED, fifo,
1300                                     skb);
1301         if (ret != 0) {
1302                 /* suppress q is full or hdrpull failed, drop this packet */
1303                 brcmf_fws_hanger_poppkt(&fws->hanger, hslot, &skb,
1304                                         true);
1305         } else {
1306                 /*
1307                  * Mark suppressed to avoid a double free during
1308                  * wlfc cleanup
1309                  */
1310                 brcmf_fws_hanger_mark_suppressed(&fws->hanger, hslot);
1311         }
1312
1313         return ret;
1314 }
1315
1316 static int
1317 brcmf_fws_txs_process(struct brcmf_fws_info *fws, u8 flags, u32 hslot,
1318                            u32 genbit)
1319 {
1320         u32 fifo;
1321         int ret;
1322         bool remove_from_hanger = true;
1323         struct sk_buff *skb;
1324         struct brcmf_skbuff_cb *skcb;
1325         struct brcmf_fws_mac_descriptor *entry = NULL;
1326
1327         brcmf_dbg(DATA, "flags %d\n", flags);
1328
1329         if (flags == BRCMF_FWS_TXSTATUS_DISCARD)
1330                 fws->stats.txs_discard++;
1331         else if (flags == BRCMF_FWS_TXSTATUS_CORE_SUPPRESS) {
1332                 fws->stats.txs_supp_core++;
1333                 remove_from_hanger = false;
1334         } else if (flags == BRCMF_FWS_TXSTATUS_FW_PS_SUPPRESS) {
1335                 fws->stats.txs_supp_ps++;
1336                 remove_from_hanger = false;
1337         } else if (flags == BRCMF_FWS_TXSTATUS_FW_TOSSED)
1338                 fws->stats.txs_tossed++;
1339         else if (flags == BRCMF_FWS_TXSTATUS_HOST_TOSSED)
1340                 fws->stats.txs_host_tossed++;
1341         else
1342                 brcmf_err("unexpected txstatus\n");
1343
1344         ret = brcmf_fws_hanger_poppkt(&fws->hanger, hslot, &skb,
1345                                       remove_from_hanger);
1346         if (ret != 0) {
1347                 brcmf_err("no packet in hanger slot: hslot=%d\n", hslot);
1348                 return ret;
1349         }
1350
1351         skcb = brcmf_skbcb(skb);
1352         entry = skcb->mac;
1353         if (WARN_ON(!entry)) {
1354                 brcmu_pkt_buf_free_skb(skb);
1355                 return -EINVAL;
1356         }
1357         entry->transit_count--;
1358         if (entry->suppressed && entry->suppr_transit_count)
1359                 entry->suppr_transit_count--;
1360
1361         brcmf_dbg(DATA, "%s flags %X htod %X\n", entry->name, skcb->if_flags,
1362                   skcb->htod);
1363
1364         /* pick up the implicit credit from this packet */
1365         fifo = brcmf_skb_htod_tag_get_field(skb, FIFO);
1366         if ((fws->fcmode == BRCMF_FWS_FCMODE_IMPLIED_CREDIT) ||
1367             (brcmf_skb_if_flags_get_field(skb, REQ_CREDIT)) ||
1368             (flags == BRCMF_FWS_TXSTATUS_HOST_TOSSED)) {
1369                 brcmf_fws_return_credits(fws, fifo, 1);
1370                 brcmf_fws_schedule_deq(fws);
1371         }
1372         brcmf_fws_macdesc_return_req_credit(skb);
1373
1374         if (!remove_from_hanger)
1375                 ret = brcmf_fws_txstatus_suppressed(fws, fifo, skb, genbit);
1376
1377         if (remove_from_hanger || ret)
1378                 brcmf_txfinalize(fws->drvr, skb, true);
1379
1380         return 0;
1381 }
1382
1383 static int brcmf_fws_fifocreditback_indicate(struct brcmf_fws_info *fws,
1384                                              u8 *data)
1385 {
1386         ulong flags;
1387         int i;
1388
1389         if (fws->fcmode != BRCMF_FWS_FCMODE_EXPLICIT_CREDIT) {
1390                 brcmf_dbg(INFO, "ignored\n");
1391                 return BRCMF_FWS_RET_OK_NOSCHEDULE;
1392         }
1393
1394         brcmf_dbg(DATA, "enter: data %pM\n", data);
1395         brcmf_fws_lock(fws->drvr, flags);
1396         for (i = 0; i < BRCMF_FWS_FIFO_COUNT; i++)
1397                 brcmf_fws_return_credits(fws, i, data[i]);
1398
1399         brcmf_dbg(DATA, "map: credit %x delay %x\n", fws->fifo_credit_map,
1400                   fws->fifo_delay_map);
1401         brcmf_fws_unlock(fws->drvr, flags);
1402         return BRCMF_FWS_RET_OK_SCHEDULE;
1403 }
1404
1405 static int brcmf_fws_txstatus_indicate(struct brcmf_fws_info *fws, u8 *data)
1406 {
1407         ulong lflags;
1408         __le32 status_le;
1409         u32 status;
1410         u32 hslot;
1411         u32 genbit;
1412         u8 flags;
1413
1414         fws->stats.txs_indicate++;
1415         memcpy(&status_le, data, sizeof(status_le));
1416         status = le32_to_cpu(status_le);
1417         flags = brcmf_txstatus_get_field(status, FLAGS);
1418         hslot = brcmf_txstatus_get_field(status, HSLOT);
1419         genbit = brcmf_txstatus_get_field(status, GENERATION);
1420
1421         brcmf_fws_lock(fws->drvr, lflags);
1422         brcmf_fws_txs_process(fws, flags, hslot, genbit);
1423         brcmf_fws_unlock(fws->drvr, lflags);
1424         return BRCMF_FWS_RET_OK_NOSCHEDULE;
1425 }
1426
1427 static int brcmf_fws_dbg_seqnum_check(struct brcmf_fws_info *fws, u8 *data)
1428 {
1429         __le32 timestamp;
1430
1431         memcpy(&timestamp, &data[2], sizeof(timestamp));
1432         brcmf_dbg(CTL, "received: seq %d, timestamp %d\n", data[1],
1433                   le32_to_cpu(timestamp));
1434         return 0;
1435 }
1436
1437 static int brcmf_fws_notify_credit_map(struct brcmf_if *ifp,
1438                                        const struct brcmf_event_msg *e,
1439                                        void *data)
1440 {
1441         struct brcmf_fws_info *fws = ifp->drvr->fws;
1442         int i;
1443         ulong flags;
1444         u8 *credits = data;
1445
1446         if (e->datalen < BRCMF_FWS_FIFO_COUNT) {
1447                 brcmf_err("event payload too small (%d)\n", e->datalen);
1448                 return -EINVAL;
1449         }
1450         if (fws->creditmap_received)
1451                 return 0;
1452
1453         fws->creditmap_received = true;
1454
1455         brcmf_dbg(TRACE, "enter: credits %pM\n", credits);
1456         brcmf_fws_lock(ifp->drvr, flags);
1457         for (i = 0; i < ARRAY_SIZE(fws->fifo_credit); i++) {
1458                 if (*credits)
1459                         fws->fifo_credit_map |= 1 << i;
1460                 else
1461                         fws->fifo_credit_map &= ~(1 << i);
1462                 fws->fifo_credit[i] = *credits++;
1463         }
1464         brcmf_fws_schedule_deq(fws);
1465         brcmf_fws_unlock(ifp->drvr, flags);
1466         return 0;
1467 }
1468
1469 static int brcmf_fws_notify_bcmc_credit_support(struct brcmf_if *ifp,
1470                                                 const struct brcmf_event_msg *e,
1471                                                 void *data)
1472 {
1473         struct brcmf_fws_info *fws = ifp->drvr->fws;
1474         ulong flags;
1475
1476         brcmf_fws_lock(ifp->drvr, flags);
1477         if (fws)
1478                 fws->bcmc_credit_check = true;
1479         brcmf_fws_unlock(ifp->drvr, flags);
1480         return 0;
1481 }
1482
1483 int brcmf_fws_hdrpull(struct brcmf_pub *drvr, int ifidx, s16 signal_len,
1484                       struct sk_buff *skb)
1485 {
1486         struct brcmf_fws_info *fws = drvr->fws;
1487         u8 *signal_data;
1488         s16 data_len;
1489         u8 type;
1490         u8 len;
1491         u8 *data;
1492         s32 status;
1493         s32 err;
1494
1495         brcmf_dbg(HDRS, "enter: ifidx %d, skblen %u, sig %d\n",
1496                   ifidx, skb->len, signal_len);
1497
1498         WARN_ON(signal_len > skb->len);
1499
1500         /* if flow control disabled, skip to packet data and leave */
1501         if (!signal_len || !drvr->fw_signals) {
1502                 skb_pull(skb, signal_len);
1503                 return 0;
1504         }
1505
1506         fws->stats.header_pulls++;
1507         data_len = signal_len;
1508         signal_data = skb->data;
1509
1510         status = BRCMF_FWS_RET_OK_NOSCHEDULE;
1511         while (data_len > 0) {
1512                 /* extract tlv info */
1513                 type = signal_data[0];
1514
1515                 /* FILLER type is actually not a TLV, but
1516                  * a single byte that can be skipped.
1517                  */
1518                 if (type == BRCMF_FWS_TYPE_FILLER) {
1519                         signal_data += 1;
1520                         data_len -= 1;
1521                         continue;
1522                 }
1523                 len = signal_data[1];
1524                 data = signal_data + 2;
1525
1526                 brcmf_dbg(HDRS, "tlv type=%s (%d), len=%d (%d)\n",
1527                           brcmf_fws_get_tlv_name(type), type, len,
1528                           brcmf_fws_get_tlv_len(fws, type));
1529
1530                 /* abort parsing when length invalid */
1531                 if (data_len < len + 2)
1532                         break;
1533
1534                 if (len < brcmf_fws_get_tlv_len(fws, type))
1535                         break;
1536
1537                 err = BRCMF_FWS_RET_OK_NOSCHEDULE;
1538                 switch (type) {
1539                 case BRCMF_FWS_TYPE_HOST_REORDER_RXPKTS:
1540                 case BRCMF_FWS_TYPE_COMP_TXSTATUS:
1541                         break;
1542                 case BRCMF_FWS_TYPE_MACDESC_ADD:
1543                 case BRCMF_FWS_TYPE_MACDESC_DEL:
1544                         brcmf_fws_macdesc_indicate(fws, type, data);
1545                         break;
1546                 case BRCMF_FWS_TYPE_MAC_OPEN:
1547                 case BRCMF_FWS_TYPE_MAC_CLOSE:
1548                         err = brcmf_fws_macdesc_state_indicate(fws, type, data);
1549                         break;
1550                 case BRCMF_FWS_TYPE_INTERFACE_OPEN:
1551                 case BRCMF_FWS_TYPE_INTERFACE_CLOSE:
1552                         err = brcmf_fws_interface_state_indicate(fws, type,
1553                                                                  data);
1554                         break;
1555                 case BRCMF_FWS_TYPE_MAC_REQUEST_CREDIT:
1556                 case BRCMF_FWS_TYPE_MAC_REQUEST_PACKET:
1557                         err = brcmf_fws_request_indicate(fws, type, data);
1558                         break;
1559                 case BRCMF_FWS_TYPE_TXSTATUS:
1560                         brcmf_fws_txstatus_indicate(fws, data);
1561                         break;
1562                 case BRCMF_FWS_TYPE_FIFO_CREDITBACK:
1563                         err = brcmf_fws_fifocreditback_indicate(fws, data);
1564                         break;
1565                 case BRCMF_FWS_TYPE_RSSI:
1566                         brcmf_fws_rssi_indicate(fws, *data);
1567                         break;
1568                 case BRCMF_FWS_TYPE_TRANS_ID:
1569                         brcmf_fws_dbg_seqnum_check(fws, data);
1570                         break;
1571                 case BRCMF_FWS_TYPE_PKTTAG:
1572                 case BRCMF_FWS_TYPE_PENDING_TRAFFIC_BMP:
1573                 default:
1574                         fws->stats.tlv_invalid_type++;
1575                         break;
1576                 }
1577                 if (err == BRCMF_FWS_RET_OK_SCHEDULE)
1578                         status = BRCMF_FWS_RET_OK_SCHEDULE;
1579                 signal_data += len + 2;
1580                 data_len -= len + 2;
1581         }
1582
1583         if (data_len != 0)
1584                 fws->stats.tlv_parse_failed++;
1585
1586         if (status == BRCMF_FWS_RET_OK_SCHEDULE)
1587                 brcmf_fws_schedule_deq(fws);
1588
1589         /* signalling processing result does
1590          * not affect the actual ethernet packet.
1591          */
1592         skb_pull(skb, signal_len);
1593
1594         /* this may be a signal-only packet
1595          */
1596         if (skb->len == 0)
1597                 fws->stats.header_only_pkt++;
1598
1599         return 0;
1600 }
1601
1602 static void brcmf_fws_precommit_skb(struct brcmf_fws_info *fws, int fifo,
1603                                    struct sk_buff *p)
1604 {
1605         struct brcmf_skbuff_cb *skcb = brcmf_skbcb(p);
1606         struct brcmf_fws_mac_descriptor *entry = skcb->mac;
1607         u8 flags;
1608
1609         brcmf_skb_if_flags_set_field(p, TRANSMIT, 1);
1610         brcmf_skb_htod_tag_set_field(p, GENERATION, entry->generation);
1611         flags = BRCMF_FWS_HTOD_FLAG_PKTFROMHOST;
1612         if (brcmf_skb_if_flags_get_field(p, REQUESTED)) {
1613                 /*
1614                  * Indicate that this packet is being sent in response to an
1615                  * explicit request from the firmware side.
1616                  */
1617                 flags |= BRCMF_FWS_HTOD_FLAG_PKT_REQUESTED;
1618         }
1619         brcmf_skb_htod_tag_set_field(p, FLAGS, flags);
1620         brcmf_fws_hdrpush(fws, p);
1621 }
1622
1623 static void brcmf_fws_rollback_toq(struct brcmf_fws_info *fws,
1624                                    struct sk_buff *skb, int fifo)
1625 {
1626         struct brcmf_fws_mac_descriptor *entry;
1627         struct sk_buff *pktout;
1628         int qidx, hslot;
1629         int rc = 0;
1630
1631         entry = brcmf_skbcb(skb)->mac;
1632         if (entry->occupied) {
1633                 qidx = 2 * fifo;
1634                 if (brcmf_skbcb(skb)->state == BRCMF_FWS_SKBSTATE_SUPPRESSED)
1635                         qidx++;
1636
1637                 pktout = brcmu_pktq_penq_head(&entry->psq, qidx, skb);
1638                 if (pktout == NULL) {
1639                         brcmf_err("%s queue %d full\n", entry->name, qidx);
1640                         rc = -ENOSPC;
1641                 }
1642         } else {
1643                 brcmf_err("%s entry removed\n", entry->name);
1644                 rc = -ENOENT;
1645         }
1646
1647         if (rc) {
1648                 fws->stats.rollback_failed++;
1649                 hslot = brcmf_skb_htod_tag_get_field(skb, HSLOT);
1650                 brcmf_fws_txs_process(fws, BRCMF_FWS_TXSTATUS_HOST_TOSSED,
1651                                       hslot, 0);
1652         } else {
1653                 fws->stats.rollback_success++;
1654                 brcmf_fws_return_credits(fws, fifo, 1);
1655                 brcmf_fws_macdesc_return_req_credit(skb);
1656         }
1657 }
1658
1659 static int brcmf_fws_borrow_credit(struct brcmf_fws_info *fws)
1660 {
1661         int lender_ac;
1662
1663         if (time_after(fws->borrow_defer_timestamp, jiffies)) {
1664                 fws->fifo_credit_map &= ~(1 << BRCMF_FWS_FIFO_AC_BE);
1665                 return -ENAVAIL;
1666         }
1667
1668         for (lender_ac = 0; lender_ac <= BRCMF_FWS_FIFO_AC_VO; lender_ac++) {
1669                 if (fws->fifo_credit[lender_ac]) {
1670                         fws->credits_borrowed[lender_ac]++;
1671                         fws->fifo_credit[lender_ac]--;
1672                         if (fws->fifo_credit[lender_ac] == 0)
1673                                 fws->fifo_credit_map &= ~(1 << lender_ac);
1674                         fws->fifo_credit_map |= (1 << BRCMF_FWS_FIFO_AC_BE);
1675                         brcmf_dbg(DATA, "borrow credit from: %d\n", lender_ac);
1676                         return 0;
1677                 }
1678         }
1679         fws->fifo_credit_map &= ~(1 << BRCMF_FWS_FIFO_AC_BE);
1680         return -ENAVAIL;
1681 }
1682
1683 static int brcmf_fws_commit_skb(struct brcmf_fws_info *fws, int fifo,
1684                                 struct sk_buff *skb)
1685 {
1686         struct brcmf_skbuff_cb *skcb = brcmf_skbcb(skb);
1687         struct brcmf_fws_mac_descriptor *entry;
1688         struct brcmf_bus *bus = fws->drvr->bus_if;
1689         int rc;
1690         u8 ifidx;
1691
1692         entry = skcb->mac;
1693         if (IS_ERR(entry))
1694                 return PTR_ERR(entry);
1695
1696         brcmf_fws_precommit_skb(fws, fifo, skb);
1697         rc = brcmf_bus_txdata(bus, skb);
1698         brcmf_dbg(DATA, "%s flags %X htod %X bus_tx %d\n", entry->name,
1699                   skcb->if_flags, skcb->htod, rc);
1700         if (rc < 0) {
1701                 brcmf_proto_hdrpull(fws->drvr, false, &ifidx, skb);
1702                 goto rollback;
1703         }
1704
1705         entry->transit_count++;
1706         if (entry->suppressed)
1707                 entry->suppr_transit_count++;
1708         fws->stats.pkt2bus++;
1709         fws->stats.send_pkts[fifo]++;
1710         if (brcmf_skb_if_flags_get_field(skb, REQUESTED))
1711                 fws->stats.requested_sent[fifo]++;
1712
1713         return rc;
1714
1715 rollback:
1716         brcmf_fws_rollback_toq(fws, skb, fifo);
1717         return rc;
1718 }
1719
1720 static int brcmf_fws_assign_htod(struct brcmf_fws_info *fws, struct sk_buff *p,
1721                                   int fifo)
1722 {
1723         struct brcmf_skbuff_cb *skcb = brcmf_skbcb(p);
1724         int rc, hslot;
1725
1726         hslot = brcmf_fws_hanger_get_free_slot(&fws->hanger);
1727         brcmf_skb_htod_tag_set_field(p, HSLOT, hslot);
1728         brcmf_skb_htod_tag_set_field(p, FREERUN, skcb->mac->seq[fifo]);
1729         brcmf_skb_htod_tag_set_field(p, FIFO, fifo);
1730         rc = brcmf_fws_hanger_pushpkt(&fws->hanger, p, hslot);
1731         if (!rc)
1732                 skcb->mac->seq[fifo]++;
1733         else
1734                 fws->stats.generic_error++;
1735         return rc;
1736 }
1737
1738 int brcmf_fws_process_skb(struct brcmf_if *ifp, struct sk_buff *skb)
1739 {
1740         struct brcmf_pub *drvr = ifp->drvr;
1741         struct brcmf_fws_info *fws = drvr->fws;
1742         struct brcmf_skbuff_cb *skcb = brcmf_skbcb(skb);
1743         struct ethhdr *eh = (struct ethhdr *)(skb->data);
1744         ulong flags;
1745         int fifo = BRCMF_FWS_FIFO_BCMC;
1746         bool multicast = is_multicast_ether_addr(eh->h_dest);
1747         bool pae = eh->h_proto == htons(ETH_P_PAE);
1748
1749         /* determine the priority */
1750         if (!skb->priority)
1751                 skb->priority = cfg80211_classify8021d(skb);
1752
1753         drvr->tx_multicast += !!multicast;
1754         if (pae)
1755                 atomic_inc(&ifp->pend_8021x_cnt);
1756
1757         if (!brcmf_fws_fc_active(fws)) {
1758                 /* If the protocol uses a data header, apply it */
1759                 brcmf_proto_hdrpush(drvr, ifp->ifidx, 0, skb);
1760
1761                 /* Use bus module to send data frame */
1762                 return brcmf_bus_txdata(drvr->bus_if, skb);
1763         }
1764
1765         /* set control buffer information */
1766         skcb->if_flags = 0;
1767         skcb->state = BRCMF_FWS_SKBSTATE_NEW;
1768         brcmf_skb_if_flags_set_field(skb, INDEX, ifp->ifidx);
1769         if (!multicast)
1770                 fifo = brcmf_fws_prio2fifo[skb->priority];
1771
1772         brcmf_fws_lock(drvr, flags);
1773         if (fifo != BRCMF_FWS_FIFO_AC_BE && fifo < BRCMF_FWS_FIFO_BCMC)
1774                 fws->borrow_defer_timestamp = jiffies +
1775                                               BRCMF_FWS_BORROW_DEFER_PERIOD;
1776
1777         skcb->mac = brcmf_fws_macdesc_find(fws, ifp, eh->h_dest);
1778         brcmf_dbg(DATA, "%s mac %pM multi %d fifo %d\n", skcb->mac->name,
1779                   eh->h_dest, multicast, fifo);
1780         if (!brcmf_fws_assign_htod(fws, skb, fifo)) {
1781                 brcmf_fws_enq(fws, BRCMF_FWS_SKBSTATE_DELAYED, fifo, skb);
1782                 brcmf_fws_schedule_deq(fws);
1783         } else {
1784                 brcmf_err("drop skb: no hanger slot\n");
1785                 if (pae) {
1786                         atomic_dec(&ifp->pend_8021x_cnt);
1787                         if (waitqueue_active(&ifp->pend_8021x_wait))
1788                                 wake_up(&ifp->pend_8021x_wait);
1789                 }
1790                 brcmu_pkt_buf_free_skb(skb);
1791         }
1792         brcmf_fws_unlock(drvr, flags);
1793         return 0;
1794 }
1795
1796 void brcmf_fws_reset_interface(struct brcmf_if *ifp)
1797 {
1798         struct brcmf_fws_mac_descriptor *entry = ifp->fws_desc;
1799
1800         brcmf_dbg(TRACE, "enter: idx=%d\n", ifp->bssidx);
1801         if (!entry)
1802                 return;
1803
1804         brcmf_fws_macdesc_init(entry, ifp->mac_addr, ifp->ifidx);
1805 }
1806
1807 void brcmf_fws_add_interface(struct brcmf_if *ifp)
1808 {
1809         struct brcmf_fws_info *fws = ifp->drvr->fws;
1810         struct brcmf_fws_mac_descriptor *entry;
1811
1812         if (!ifp->ndev || !ifp->drvr->fw_signals)
1813                 return;
1814
1815         entry = &fws->desc.iface[ifp->ifidx];
1816         ifp->fws_desc = entry;
1817         brcmf_fws_macdesc_init(entry, ifp->mac_addr, ifp->ifidx);
1818         brcmf_fws_macdesc_set_name(fws, entry);
1819         brcmu_pktq_init(&entry->psq, BRCMF_FWS_PSQ_PREC_COUNT,
1820                         BRCMF_FWS_PSQ_LEN);
1821         brcmf_dbg(TRACE, "added %s\n", entry->name);
1822 }
1823
1824 void brcmf_fws_del_interface(struct brcmf_if *ifp)
1825 {
1826         struct brcmf_fws_mac_descriptor *entry = ifp->fws_desc;
1827         ulong flags;
1828
1829         if (!entry)
1830                 return;
1831
1832         brcmf_fws_lock(ifp->drvr, flags);
1833         ifp->fws_desc = NULL;
1834         brcmf_dbg(TRACE, "deleting %s\n", entry->name);
1835         brcmf_fws_macdesc_deinit(entry);
1836         brcmf_fws_cleanup(ifp->drvr->fws, ifp->ifidx);
1837         brcmf_fws_unlock(ifp->drvr, flags);
1838 }
1839
1840 static void brcmf_fws_dequeue_worker(struct work_struct *worker)
1841 {
1842         struct brcmf_fws_info *fws;
1843         struct sk_buff *skb;
1844         ulong flags;
1845         int fifo;
1846
1847         fws = container_of(worker, struct brcmf_fws_info, fws_dequeue_work);
1848
1849         brcmf_fws_lock(fws->drvr, flags);
1850         for (fifo = BRCMF_FWS_FIFO_BCMC; fifo >= 0 && !fws->bus_flow_blocked;
1851              fifo--) {
1852                 while ((fws->fifo_credit[fifo]) || ((!fws->bcmc_credit_check) &&
1853                        (fifo == BRCMF_FWS_FIFO_BCMC))) {
1854                         skb = brcmf_fws_deq(fws, fifo);
1855                         if (!skb)
1856                                 break;
1857                         fws->fifo_credit[fifo]--;
1858                         if (brcmf_fws_commit_skb(fws, fifo, skb))
1859                                 break;
1860                         if (fws->bus_flow_blocked)
1861                                 break;
1862                 }
1863                 if ((fifo == BRCMF_FWS_FIFO_AC_BE) &&
1864                     (fws->fifo_credit[fifo] == 0) &&
1865                     (!fws->bus_flow_blocked)) {
1866                         while (brcmf_fws_borrow_credit(fws) == 0) {
1867                                 skb = brcmf_fws_deq(fws, fifo);
1868                                 if (!skb) {
1869                                         brcmf_fws_return_credits(fws, fifo, 1);
1870                                         break;
1871                                 }
1872                                 if (brcmf_fws_commit_skb(fws, fifo, skb))
1873                                         break;
1874                                 if (fws->bus_flow_blocked)
1875                                         break;
1876                         }
1877                 }
1878         }
1879         brcmf_fws_unlock(fws->drvr, flags);
1880 }
1881
1882 int brcmf_fws_init(struct brcmf_pub *drvr)
1883 {
1884         u32 tlv = BRCMF_FWS_FLAGS_RSSI_SIGNALS;
1885         int rc;
1886
1887         if (!drvr->fw_signals)
1888                 return 0;
1889
1890         spin_lock_init(&drvr->fws_spinlock);
1891
1892         drvr->fws = kzalloc(sizeof(*(drvr->fws)), GFP_KERNEL);
1893         if (!drvr->fws) {
1894                 rc = -ENOMEM;
1895                 goto fail;
1896         }
1897
1898         /* set linkage back */
1899         drvr->fws->drvr = drvr;
1900         drvr->fws->fcmode = fcmode;
1901
1902         drvr->fws->fws_wq = create_singlethread_workqueue("brcmf_fws_wq");
1903         if (drvr->fws->fws_wq == NULL) {
1904                 brcmf_err("workqueue creation failed\n");
1905                 rc = -EBADF;
1906                 goto fail;
1907         }
1908         INIT_WORK(&drvr->fws->fws_dequeue_work, brcmf_fws_dequeue_worker);
1909
1910         /* enable firmware signalling if fcmode active */
1911         if (drvr->fws->fcmode != BRCMF_FWS_FCMODE_NONE)
1912                 tlv |= BRCMF_FWS_FLAGS_XONXOFF_SIGNALS |
1913                        BRCMF_FWS_FLAGS_CREDIT_STATUS_SIGNALS |
1914                        BRCMF_FWS_FLAGS_HOST_PROPTXSTATUS_ACTIVE;
1915
1916         rc = brcmf_fweh_register(drvr, BRCMF_E_FIFO_CREDIT_MAP,
1917                                  brcmf_fws_notify_credit_map);
1918         if (rc < 0) {
1919                 brcmf_err("register credit map handler failed\n");
1920                 goto fail;
1921         }
1922         rc = brcmf_fweh_register(drvr, BRCMF_E_BCMC_CREDIT_SUPPORT,
1923                                  brcmf_fws_notify_bcmc_credit_support);
1924         if (rc < 0) {
1925                 brcmf_err("register bcmc credit handler failed\n");
1926                 brcmf_fweh_unregister(drvr, BRCMF_E_FIFO_CREDIT_MAP);
1927                 goto fail;
1928         }
1929
1930         /* setting the iovar may fail if feature is unsupported
1931          * so leave the rc as is so driver initialization can
1932          * continue.
1933          */
1934         if (brcmf_fil_iovar_int_set(drvr->iflist[0], "tlv", tlv)) {
1935                 brcmf_err("failed to set bdcv2 tlv signaling\n");
1936                 goto fail_event;
1937         }
1938
1939         brcmf_fws_hanger_init(&drvr->fws->hanger);
1940         brcmf_fws_macdesc_init(&drvr->fws->desc.other, NULL, 0);
1941         brcmf_fws_macdesc_set_name(drvr->fws, &drvr->fws->desc.other);
1942         brcmu_pktq_init(&drvr->fws->desc.other.psq, BRCMF_FWS_PSQ_PREC_COUNT,
1943                         BRCMF_FWS_PSQ_LEN);
1944
1945         /* create debugfs file for statistics */
1946         brcmf_debugfs_create_fws_stats(drvr, &drvr->fws->stats);
1947
1948         brcmf_dbg(INFO, "%s bdcv2 tlv signaling [%x]\n",
1949                   drvr->fw_signals ? "enabled" : "disabled", tlv);
1950         return 0;
1951
1952 fail_event:
1953         brcmf_fweh_unregister(drvr, BRCMF_E_BCMC_CREDIT_SUPPORT);
1954         brcmf_fweh_unregister(drvr, BRCMF_E_FIFO_CREDIT_MAP);
1955 fail:
1956         brcmf_fws_deinit(drvr);
1957         return rc;
1958 }
1959
1960 void brcmf_fws_deinit(struct brcmf_pub *drvr)
1961 {
1962         struct brcmf_fws_info *fws = drvr->fws;
1963         ulong flags;
1964
1965         if (!fws)
1966                 return;
1967
1968         /* disable firmware signalling entirely
1969          * to avoid using the workqueue.
1970          */
1971         drvr->fw_signals = false;
1972
1973         if (drvr->fws->fws_wq)
1974                 destroy_workqueue(drvr->fws->fws_wq);
1975
1976         /* cleanup */
1977         brcmf_fws_lock(drvr, flags);
1978         brcmf_fws_cleanup(fws, -1);
1979         drvr->fws = NULL;
1980         brcmf_fws_unlock(drvr, flags);
1981
1982         /* free top structure */
1983         kfree(fws);
1984 }
1985
1986 bool brcmf_fws_fc_active(struct brcmf_fws_info *fws)
1987 {
1988         if (!fws)
1989                 return false;
1990
1991         return fws->fcmode != BRCMF_FWS_FCMODE_NONE;
1992 }
1993
1994 void brcmf_fws_bustxfail(struct brcmf_fws_info *fws, struct sk_buff *skb)
1995 {
1996         ulong flags;
1997         u32 hslot;
1998
1999         if (brcmf_skbcb(skb)->state == BRCMF_FWS_SKBSTATE_TIM) {
2000                 brcmu_pkt_buf_free_skb(skb);
2001                 return;
2002         }
2003         brcmf_fws_lock(fws->drvr, flags);
2004         hslot = brcmf_skb_htod_tag_get_field(skb, HSLOT);
2005         brcmf_fws_txs_process(fws, BRCMF_FWS_TXSTATUS_HOST_TOSSED, hslot, 0);
2006         brcmf_fws_unlock(fws->drvr, flags);
2007 }
2008
2009 void brcmf_fws_bus_blocked(struct brcmf_pub *drvr, bool flow_blocked)
2010 {
2011         struct brcmf_fws_info *fws = drvr->fws;
2012
2013         fws->bus_flow_blocked = flow_blocked;
2014         if (!flow_blocked)
2015                 brcmf_fws_schedule_deq(fws);
2016         else
2017                 fws->stats.bus_flow_block++;
2018 }