fwsignal.c 34.4 KB
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/*
 * Copyright (c) 2010 Broadcom Corporation
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/if_ether.h>
#include <linux/spinlock.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/err.h>
#include <uapi/linux/nl80211.h>
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#include <net/cfg80211.h>
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#include <brcmu_utils.h>
#include <brcmu_wifi.h>
#include "dhd.h"
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#include "dhd_proto.h"
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#include "dhd_dbg.h"
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#include "dhd_bus.h"
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#include "fwil.h"
#include "fweh.h"
#include "fwsignal.h"

/**
 * DOC: Firmware Signalling
 *
 * Firmware can send signals to host and vice versa, which are passed in the
 * data packets using TLV based header. This signalling layer is on top of the
 * BDC bus protocol layer.
 */

/*
 * single definition for firmware-driver flow control tlv's.
 *
 * each tlv is specified by BRCMF_FWS_TLV_DEF(name, ID, length).
 * A length value 0 indicates variable length tlv.
 */
#define BRCMF_FWS_TLV_DEFLIST \
	BRCMF_FWS_TLV_DEF(MAC_OPEN, 1, 1) \
	BRCMF_FWS_TLV_DEF(MAC_CLOSE, 2, 1) \
	BRCMF_FWS_TLV_DEF(MAC_REQUEST_CREDIT, 3, 2) \
	BRCMF_FWS_TLV_DEF(TXSTATUS, 4, 4) \
	BRCMF_FWS_TLV_DEF(PKTTAG, 5, 4) \
	BRCMF_FWS_TLV_DEF(MACDESC_ADD,	6, 8) \
	BRCMF_FWS_TLV_DEF(MACDESC_DEL, 7, 8) \
	BRCMF_FWS_TLV_DEF(RSSI, 8, 1) \
	BRCMF_FWS_TLV_DEF(INTERFACE_OPEN, 9, 1) \
	BRCMF_FWS_TLV_DEF(INTERFACE_CLOSE, 10, 1) \
	BRCMF_FWS_TLV_DEF(FIFO_CREDITBACK, 11, 8) \
	BRCMF_FWS_TLV_DEF(PENDING_TRAFFIC_BMP, 12, 2) \
	BRCMF_FWS_TLV_DEF(MAC_REQUEST_PACKET, 13, 3) \
	BRCMF_FWS_TLV_DEF(HOST_REORDER_RXPKTS, 14, 10) \
	BRCMF_FWS_TLV_DEF(TRANS_ID, 18, 6) \
	BRCMF_FWS_TLV_DEF(COMP_TXSTATUS, 19, 1) \
	BRCMF_FWS_TLV_DEF(FILLER, 255, 0)

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/*
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 * enum brcmf_fws_tlv_type - definition of tlv identifiers.
 */
#define BRCMF_FWS_TLV_DEF(name, id, len) \
	BRCMF_FWS_TYPE_ ## name =  id,
enum brcmf_fws_tlv_type {
	BRCMF_FWS_TLV_DEFLIST
	BRCMF_FWS_TYPE_INVALID
};
#undef BRCMF_FWS_TLV_DEF

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/*
 * enum brcmf_fws_tlv_len - definition of tlv lengths.
 */
#define BRCMF_FWS_TLV_DEF(name, id, len) \
	BRCMF_FWS_TYPE_ ## name ## _LEN = (len),
enum brcmf_fws_tlv_len {
	BRCMF_FWS_TLV_DEFLIST
};
#undef BRCMF_FWS_TLV_DEF

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#ifdef DEBUG
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/*
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 * brcmf_fws_tlv_names - array of tlv names.
 */
#define BRCMF_FWS_TLV_DEF(name, id, len) \
	{ id, #name },
static struct {
	enum brcmf_fws_tlv_type id;
	const char *name;
} brcmf_fws_tlv_names[] = {
	BRCMF_FWS_TLV_DEFLIST
};
#undef BRCMF_FWS_TLV_DEF

static const char *brcmf_fws_get_tlv_name(enum brcmf_fws_tlv_type id)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(brcmf_fws_tlv_names); i++)
		if (brcmf_fws_tlv_names[i].id == id)
			return brcmf_fws_tlv_names[i].name;

	return "INVALID";
}
#else
static const char *brcmf_fws_get_tlv_name(enum brcmf_fws_tlv_type id)
{
	return "NODEBUG";
}
#endif /* DEBUG */

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/*
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 * flags used to enable tlv signalling from firmware.
 */
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#define BRCMF_FWS_FLAGS_RSSI_SIGNALS			0x0001
#define BRCMF_FWS_FLAGS_XONXOFF_SIGNALS			0x0002
#define BRCMF_FWS_FLAGS_CREDIT_STATUS_SIGNALS		0x0004
#define BRCMF_FWS_FLAGS_HOST_PROPTXSTATUS_ACTIVE	0x0008
#define BRCMF_FWS_FLAGS_PSQ_GENERATIONFSM_ENABLE	0x0010
#define BRCMF_FWS_FLAGS_PSQ_ZERO_BUFFER_ENABLE		0x0020
#define BRCMF_FWS_FLAGS_HOST_RXREORDER_ACTIVE		0x0040

#define BRCMF_FWS_STATE_OPEN				1
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#define BRCMF_FWS_STATE_CLOSE				2

#define BRCMF_FWS_MAC_DESC_TABLE_SIZE			32
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#define BRCMF_FWS_MAX_IFNUM				16
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#define BRCMF_FWS_MAC_DESC_ID_INVALID			0xff

#define BRCMF_FWS_HOSTIF_FLOWSTATE_OFF			0
#define BRCMF_FWS_HOSTIF_FLOWSTATE_ON			1

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#define BRCMF_FWS_PSQ_PREC_COUNT		((NL80211_NUM_ACS + 1) * 2)
#define BRCMF_FWS_PSQ_LEN				256

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#define BRCMF_FWS_HTOD_FLAG_PKTFROMHOST			0x01
#define BRCMF_FWS_HTOD_FLAG_PKT_REQUESTED		0x02

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/**
 * enum brcmf_fws_skb_state - indicates processing state of skb.
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 *
 * @BRCMF_FWS_SKBSTATE_NEW: sk_buff is newly arrived in the driver.
 * @BRCMF_FWS_SKBSTATE_DELAYED: sk_buff had to wait on queue.
 * @BRCMF_FWS_SKBSTATE_SUPPRESSED: sk_buff has been suppressed by firmware.
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 */
enum brcmf_fws_skb_state {
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	BRCMF_FWS_SKBSTATE_NEW,
	BRCMF_FWS_SKBSTATE_DELAYED,
	BRCMF_FWS_SKBSTATE_SUPPRESSED
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};

/**
 * struct brcmf_skbuff_cb - control buffer associated with skbuff.
 *
 * @if_flags: holds interface index and packet related flags.
 * @htod: host to device packet identifier (used in PKTTAG tlv).
 * @state: transmit state of the packet.
 * @mac: descriptor related to destination for this packet.
 *
 * This information is stored in control buffer struct sk_buff::cb, which
 * provides 48 bytes of storage so this structure should not exceed that.
 */
struct brcmf_skbuff_cb {
	u16 if_flags;
	u32 htod;
	enum brcmf_fws_skb_state state;
	struct brcmf_fws_mac_descriptor *mac;
};

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/*
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 * macro casting skbuff control buffer to struct brcmf_skbuff_cb.
 */
#define brcmf_skbcb(skb)	((struct brcmf_skbuff_cb *)((skb)->cb))

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/*
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 * sk_buff control if flags
 *
 *	b[11]  - packet sent upon firmware request.
 *	b[10]  - packet only contains signalling data.
 *	b[9]   - packet is a tx packet.
 *	b[8]   - packet uses FIFO credit (non-pspoll).
 *	b[7]   - interface in AP mode.
 *	b[6:4] - AC FIFO number.
 *	b[3:0] - interface index.
 */
#define BRCMF_SKB_IF_FLAGS_REQUESTED_MASK	0x0800
#define BRCMF_SKB_IF_FLAGS_REQUESTED_SHIFT	11
#define BRCMF_SKB_IF_FLAGS_SIGNAL_ONLY_MASK	0x0400
#define BRCMF_SKB_IF_FLAGS_SIGNAL_ONLY_SHIFT	10
#define BRCMF_SKB_IF_FLAGS_TRANSMIT_MASK        0x0200
#define BRCMF_SKB_IF_FLAGS_TRANSMIT_SHIFT	9
#define BRCMF_SKB_IF_FLAGS_CREDITCHECK_MASK	0x0100
#define BRCMF_SKB_IF_FLAGS_CREDITCHECK_SHIFT	8
#define BRCMF_SKB_IF_FLAGS_IF_AP_MASK		0x0080
#define BRCMF_SKB_IF_FLAGS_IF_AP_SHIFT		7
#define BRCMF_SKB_IF_FLAGS_FIFO_MASK		0x0070
#define BRCMF_SKB_IF_FLAGS_FIFO_SHIFT		4
#define BRCMF_SKB_IF_FLAGS_INDEX_MASK		0x000f
#define BRCMF_SKB_IF_FLAGS_INDEX_SHIFT		0

#define brcmf_skb_if_flags_set_field(skb, field, value) \
	brcmu_maskset16(&(brcmf_skbcb(skb)->if_flags), \
			BRCMF_SKB_IF_FLAGS_ ## field ## _MASK, \
			BRCMF_SKB_IF_FLAGS_ ## field ## _SHIFT, (value))
#define brcmf_skb_if_flags_get_field(skb, field) \
	brcmu_maskget16(brcmf_skbcb(skb)->if_flags, \
			BRCMF_SKB_IF_FLAGS_ ## field ## _MASK, \
			BRCMF_SKB_IF_FLAGS_ ## field ## _SHIFT)

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/*
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 * sk_buff control packet identifier
 *
 * 32-bit packet identifier used in PKTTAG tlv from host to dongle.
 *
 * - Generated at the host (e.g. dhd)
 * - Seen as a generic sequence number by firmware except for the flags field.
 *
 * Generation	: b[31]	=> generation number for this packet [host->fw]
 *			   OR, current generation number [fw->host]
 * Flags	: b[30:27] => command, status flags
 * FIFO-AC	: b[26:24] => AC-FIFO id
 * h-slot	: b[23:8] => hanger-slot
 * freerun	: b[7:0] => A free running counter
 */
#define BRCMF_SKB_HTOD_TAG_GENERATION_MASK		0x80000000
#define BRCMF_SKB_HTOD_TAG_GENERATION_SHIFT		31
#define BRCMF_SKB_HTOD_TAG_FLAGS_MASK			0x78000000
#define BRCMF_SKB_HTOD_TAG_FLAGS_SHIFT			27
#define BRCMF_SKB_HTOD_TAG_FIFO_MASK			0x07000000
#define BRCMF_SKB_HTOD_TAG_FIFO_SHIFT			24
#define BRCMF_SKB_HTOD_TAG_HSLOT_MASK			0x00ffff00
#define BRCMF_SKB_HTOD_TAG_HSLOT_SHIFT			8
#define BRCMF_SKB_HTOD_TAG_FREERUN_MASK			0x000000ff
#define BRCMF_SKB_HTOD_TAG_FREERUN_SHIFT			0

#define brcmf_skb_htod_tag_set_field(skb, field, value) \
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	brcmu_maskset32(&(brcmf_skbcb(skb)->htod), \
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			BRCMF_SKB_HTOD_TAG_ ## field ## _MASK, \
			BRCMF_SKB_HTOD_TAG_ ## field ## _SHIFT, (value))
#define brcmf_skb_htod_tag_get_field(skb, field) \
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	brcmu_maskget32(brcmf_skbcb(skb)->htod, \
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			BRCMF_SKB_HTOD_TAG_ ## field ## _MASK, \
			BRCMF_SKB_HTOD_TAG_ ## field ## _SHIFT)

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#define BRCMF_FWS_TXSTAT_GENERATION_MASK	0x80000000
#define BRCMF_FWS_TXSTAT_GENERATION_SHIFT	31
#define BRCMF_FWS_TXSTAT_FLAGS_MASK		0x78000000
#define BRCMF_FWS_TXSTAT_FLAGS_SHIFT		27
#define BRCMF_FWS_TXSTAT_FIFO_MASK		0x07000000
#define BRCMF_FWS_TXSTAT_FIFO_SHIFT		24
#define BRCMF_FWS_TXSTAT_HSLOT_MASK		0x00FFFF00
#define BRCMF_FWS_TXSTAT_HSLOT_SHIFT		8
#define BRCMF_FWS_TXSTAT_PKTID_MASK		0x00FFFFFF
#define BRCMF_FWS_TXSTAT_PKTID_SHIFT		0

#define brcmf_txstatus_get_field(txs, field) \
	brcmu_maskget32(txs, BRCMF_FWS_TXSTAT_ ## field ## _MASK, \
			BRCMF_FWS_TXSTAT_ ## field ## _SHIFT)

/**
 * enum brcmf_fws_fifo - fifo indices used by dongle firmware.
 *
 * @BRCMF_FWS_FIFO_AC_BK: fifo for background traffic.
 * @BRCMF_FWS_FIFO_AC_BE: fifo for best-effort traffic.
 * @BRCMF_FWS_FIFO_AC_VI: fifo for video traffic.
 * @BRCMF_FWS_FIFO_AC_VO: fifo for voice traffic.
 * @BRCMF_FWS_FIFO_BCMC: fifo for broadcast/multicast (AP only).
 * @BRCMF_FWS_FIFO_ATIM: fifo for ATIM (AP only).
 * @BRCMF_FWS_FIFO_COUNT: number of fifos.
 */
enum brcmf_fws_fifo {
	BRCMF_FWS_FIFO_AC_BK,
	BRCMF_FWS_FIFO_AC_BE,
	BRCMF_FWS_FIFO_AC_VI,
	BRCMF_FWS_FIFO_AC_VO,
	BRCMF_FWS_FIFO_BCMC,
	BRCMF_FWS_FIFO_ATIM,
	BRCMF_FWS_FIFO_COUNT
};

/**
 * enum brcmf_fws_txstatus - txstatus flag values.
 *
 * @BRCMF_FWS_TXSTATUS_DISCARD:
 *	host is free to discard the packet.
 * @BRCMF_FWS_TXSTATUS_CORE_SUPPRESS:
 *	802.11 core suppressed the packet.
 * @BRCMF_FWS_TXSTATUS_FW_PS_SUPPRESS:
 *	firmware suppress the packet as device is already in PS mode.
 * @BRCMF_FWS_TXSTATUS_FW_TOSSED:
 *	firmware tossed the packet.
 */
enum brcmf_fws_txstatus {
	BRCMF_FWS_TXSTATUS_DISCARD,
	BRCMF_FWS_TXSTATUS_CORE_SUPPRESS,
	BRCMF_FWS_TXSTATUS_FW_PS_SUPPRESS,
	BRCMF_FWS_TXSTATUS_FW_TOSSED
};

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enum brcmf_fws_fcmode {
	BRCMF_FWS_FCMODE_NONE,
	BRCMF_FWS_FCMODE_IMPLIED_CREDIT,
	BRCMF_FWS_FCMODE_EXPLICIT_CREDIT
};

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/**
 * struct brcmf_fws_mac_descriptor - firmware signalling data per node/interface
 *
 * @occupied: slot is in use.
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 * @mac_handle: handle for mac entry determined by firmware.
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 * @interface_id: interface index.
 * @state: current state.
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 * @suppressed: mac entry is suppressed.
 * @generation: generation bit.
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 * @ac_bitmap: ac queue bitmap.
 * @requested_credit: credits requested by firmware.
 * @ea: ethernet address.
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 * @seq: per-node free-running sequence.
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 * @psq: power-save queue.
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 * @transit_count: packet in transit to firmware.
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 */
struct brcmf_fws_mac_descriptor {
	u8 occupied;
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	u8 mac_handle;
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	u8 interface_id;
	u8 state;
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	bool suppressed;
	u8 generation;
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	u8 ac_bitmap;
	u8 requested_credit;
	u8 ea[ETH_ALEN];
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	u8 seq[BRCMF_FWS_FIFO_COUNT];
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	struct pktq psq;
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	int transit_count;
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};

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#define BRCMF_FWS_HANGER_MAXITEMS	1024

/**
 * enum brcmf_fws_hanger_item_state - state of hanger item.
 *
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 * @BRCMF_FWS_HANGER_ITEM_STATE_FREE: item is free for use.
 * @BRCMF_FWS_HANGER_ITEM_STATE_INUSE: item is in use.
 * @BRCMF_FWS_HANGER_ITEM_STATE_INUSE_SUPPRESSED: item was suppressed.
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 */
enum brcmf_fws_hanger_item_state {
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	BRCMF_FWS_HANGER_ITEM_STATE_FREE = 1,
	BRCMF_FWS_HANGER_ITEM_STATE_INUSE,
	BRCMF_FWS_HANGER_ITEM_STATE_INUSE_SUPPRESSED
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};


/**
 * struct brcmf_fws_hanger_item - single entry for tx pending packet.
 *
 * @state: entry is either free or occupied.
 * @gen: generation.
 * @pkt: packet itself.
 */
struct brcmf_fws_hanger_item {
	enum brcmf_fws_hanger_item_state state;
	u8 gen;
	struct sk_buff *pkt;
};

/**
 * struct brcmf_fws_hanger - holds packets awaiting firmware txstatus.
 *
 * @pushed: packets pushed to await txstatus.
 * @popped: packets popped upon handling txstatus.
 * @failed_to_push: packets that could not be pushed.
 * @failed_to_pop: packets that could not be popped.
 * @failed_slotfind: packets for which failed to find an entry.
 * @slot_pos: last returned item index for a free entry.
 * @items: array of hanger items.
 */
struct brcmf_fws_hanger {
	u32 pushed;
	u32 popped;
	u32 failed_to_push;
	u32 failed_to_pop;
	u32 failed_slotfind;
	u32 slot_pos;
	struct brcmf_fws_hanger_item items[BRCMF_FWS_HANGER_MAXITEMS];
};

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struct brcmf_fws_info {
	struct brcmf_pub *drvr;
	struct brcmf_fws_stats stats;
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	struct brcmf_fws_hanger hanger;
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	struct brcmf_fws_mac_descriptor nodes[BRCMF_FWS_MAC_DESC_TABLE_SIZE];
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	struct brcmf_fws_mac_descriptor other;
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	enum brcmf_fws_fcmode fcmode;
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	int fifo_credit[BRCMF_FWS_FIFO_COUNT];
};

/*
 * brcmf_fws_prio2fifo - mapping from 802.1d priority to firmware fifo index.
 */
static const int brcmf_fws_prio2fifo[] = {
	BRCMF_FWS_FIFO_AC_BE,
	BRCMF_FWS_FIFO_AC_BK,
	BRCMF_FWS_FIFO_AC_BK,
	BRCMF_FWS_FIFO_AC_BE,
	BRCMF_FWS_FIFO_AC_VI,
	BRCMF_FWS_FIFO_AC_VI,
	BRCMF_FWS_FIFO_AC_VO,
	BRCMF_FWS_FIFO_AC_VO
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};

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static int fcmode;
module_param(fcmode, int, S_IRUSR);
MODULE_PARM_DESC(fcmode, "mode of firmware signalled flow control");

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#define BRCMF_FWS_TLV_DEF(name, id, len) \
	case BRCMF_FWS_TYPE_ ## name: \
		return len;

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/**
 * brcmf_fws_get_tlv_len() - returns defined length for given tlv id.
 *
 * @fws: firmware-signalling information.
 * @id: identifier of the TLV.
 *
 * Return: the specified length for the given TLV; Otherwise -EINVAL.
 */
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static int brcmf_fws_get_tlv_len(struct brcmf_fws_info *fws,
				 enum brcmf_fws_tlv_type id)
{
	switch (id) {
	BRCMF_FWS_TLV_DEFLIST
	default:
		brcmf_err("invalid tlv id: %d\n", id);
		fws->stats.tlv_invalid_type++;
		break;
	}
	return -EINVAL;
}
#undef BRCMF_FWS_TLV_DEF

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static bool brcmf_fws_ifidx_match(struct sk_buff *skb, void *arg)
{
	u32 ifidx = brcmf_skb_if_flags_get_field(skb, INDEX);
	return ifidx == *(int *)arg;
}

static void brcmf_fws_psq_flush(struct brcmf_fws_info *fws, struct pktq *q,
				int ifidx)
{
	bool (*matchfn)(struct sk_buff *, void *) = NULL;
	struct sk_buff *skb;
	int prec;

	if (ifidx != -1)
		matchfn = brcmf_fws_ifidx_match;
	for (prec = 0; prec < q->num_prec; prec++) {
		skb = brcmu_pktq_pdeq_match(q, prec, matchfn, &ifidx);
		while (skb) {
			brcmf_txfinalize(fws->drvr, skb, false);
			skb = brcmu_pktq_pdeq_match(q, prec, matchfn, &ifidx);
		}
	}
}

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static void brcmf_fws_hanger_init(struct brcmf_fws_hanger *hanger)
{
	int i;

	brcmf_dbg(TRACE, "enter\n");
	memset(hanger, 0, sizeof(*hanger));
	for (i = 0; i < ARRAY_SIZE(hanger->items); i++)
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		hanger->items[i].state = BRCMF_FWS_HANGER_ITEM_STATE_FREE;
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}

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static u32 brcmf_fws_hanger_get_free_slot(struct brcmf_fws_hanger *h)
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{
	u32 i;

	brcmf_dbg(TRACE, "enter\n");
	i = (h->slot_pos + 1) % BRCMF_FWS_HANGER_MAXITEMS;

	while (i != h->slot_pos) {
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		if (h->items[i].state == BRCMF_FWS_HANGER_ITEM_STATE_FREE) {
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			h->slot_pos = i;
			return i;
		}
		i++;
		if (i == BRCMF_FWS_HANGER_MAXITEMS)
			i = 0;
	}
	brcmf_err("all slots occupied\n");
	h->failed_slotfind++;
	return BRCMF_FWS_HANGER_MAXITEMS;
}

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static int brcmf_fws_hanger_pushpkt(struct brcmf_fws_hanger *h,
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					   struct sk_buff *pkt, u32 slot_id)
{
	brcmf_dbg(TRACE, "enter\n");
	if (slot_id >= BRCMF_FWS_HANGER_MAXITEMS)
		return -ENOENT;

	if (h->items[slot_id].state != BRCMF_FWS_HANGER_ITEM_STATE_FREE) {
		brcmf_err("slot is not free\n");
		h->failed_to_push++;
		return -EINVAL;
	}

	h->items[slot_id].state = BRCMF_FWS_HANGER_ITEM_STATE_INUSE;
	h->items[slot_id].pkt = pkt;
	h->pushed++;
	return 0;
}

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static int brcmf_fws_hanger_poppkt(struct brcmf_fws_hanger *h,
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					  u32 slot_id, struct sk_buff **pktout,
					  bool remove_item)
{
	brcmf_dbg(TRACE, "enter\n");
	if (slot_id >= BRCMF_FWS_HANGER_MAXITEMS)
		return -ENOENT;

	if (h->items[slot_id].state == BRCMF_FWS_HANGER_ITEM_STATE_FREE) {
		brcmf_err("entry not in use\n");
		h->failed_to_pop++;
		return -EINVAL;
	}

	*pktout = h->items[slot_id].pkt;
	if (remove_item) {
		h->items[slot_id].state = BRCMF_FWS_HANGER_ITEM_STATE_FREE;
		h->items[slot_id].pkt = NULL;
		h->items[slot_id].gen = 0xff;
		h->popped++;
	}
	return 0;
}

static __used int brcmf_fws_hanger_mark_suppressed(struct brcmf_fws_hanger *h,
						   u32 slot_id, u8 gen)
{
	brcmf_dbg(TRACE, "enter\n");

	if (slot_id >= BRCMF_FWS_HANGER_MAXITEMS)
		return -ENOENT;

	h->items[slot_id].gen = gen;

559
	if (h->items[slot_id].state != BRCMF_FWS_HANGER_ITEM_STATE_INUSE) {
560 561 562 563
		brcmf_err("entry not in use\n");
		return -EINVAL;
	}

564
	h->items[slot_id].state = BRCMF_FWS_HANGER_ITEM_STATE_INUSE_SUPPRESSED;
565 566 567
	return 0;
}

568
static int brcmf_fws_hanger_get_genbit(struct brcmf_fws_hanger *hanger,
569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611
					      struct sk_buff *pkt, u32 slot_id,
					      int *gen)
{
	brcmf_dbg(TRACE, "enter\n");
	*gen = 0xff;

	if (slot_id >= BRCMF_FWS_HANGER_MAXITEMS)
		return -ENOENT;

	if (hanger->items[slot_id].state == BRCMF_FWS_HANGER_ITEM_STATE_FREE) {
		brcmf_err("slot not in use\n");
		return -EINVAL;
	}

	*gen = hanger->items[slot_id].gen;
	return 0;
}

static void brcmf_fws_hanger_cleanup(struct brcmf_fws_hanger *h,
				     bool (*fn)(struct sk_buff *, void *),
				     int ifidx)
{
	struct sk_buff *skb;
	int i;
	enum brcmf_fws_hanger_item_state s;

	brcmf_dbg(TRACE, "enter: ifidx=%d\n", ifidx);
	for (i = 0; i < ARRAY_SIZE(h->items); i++) {
		s = h->items[i].state;
		if (s == BRCMF_FWS_HANGER_ITEM_STATE_INUSE ||
		    s == BRCMF_FWS_HANGER_ITEM_STATE_INUSE_SUPPRESSED) {
			skb = h->items[i].pkt;
			if (fn == NULL || fn(skb, &ifidx)) {
				/* suppress packets freed from psq */
				if (s == BRCMF_FWS_HANGER_ITEM_STATE_INUSE)
					brcmu_pkt_buf_free_skb(skb);
				h->items[i].state =
					BRCMF_FWS_HANGER_ITEM_STATE_FREE;
			}
		}
	}
}

612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654
static void brcmf_fws_init_mac_descriptor(struct brcmf_fws_mac_descriptor *desc,
					  u8 *addr, u8 ifidx)
{
	brcmf_dbg(TRACE, "enter: ea=%pM, ifidx=%u\n", addr, ifidx);
	desc->occupied = 1;
	desc->state = BRCMF_FWS_STATE_OPEN;
	desc->requested_credit = 0;
	/* depending on use may need ifp->bssidx instead */
	desc->interface_id = ifidx;
	desc->ac_bitmap = 0xff; /* update this when handling APSD */
	memcpy(&desc->ea[0], addr, ETH_ALEN);
}

static
void brcmf_fws_clear_mac_descriptor(struct brcmf_fws_mac_descriptor *desc)
{
	brcmf_dbg(TRACE,
		  "enter: ea=%pM, ifidx=%u\n", desc->ea, desc->interface_id);
	desc->occupied = 0;
	desc->state = BRCMF_FWS_STATE_CLOSE;
	desc->requested_credit = 0;
}

static struct brcmf_fws_mac_descriptor *
brcmf_fws_mac_descriptor_lookup(struct brcmf_fws_info *fws, u8 *ea)
{
	struct brcmf_fws_mac_descriptor *entry;
	int i;

	brcmf_dbg(TRACE, "enter: ea=%pM\n", ea);
	if (ea == NULL)
		return ERR_PTR(-EINVAL);

	entry = &fws->nodes[0];
	for (i = 0; i < ARRAY_SIZE(fws->nodes); i++) {
		if (entry->occupied && !memcmp(entry->ea, ea, ETH_ALEN))
			return entry;
		entry++;
	}

	return ERR_PTR(-ENOENT);
}

655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690
static struct brcmf_fws_mac_descriptor*
brcmf_fws_find_mac_desc(struct brcmf_fws_info *fws, int ifidx, u8 *da)
{
	struct brcmf_fws_mac_descriptor *entry = &fws->other;
	struct brcmf_if *ifp;
	bool multicast;

	brcmf_dbg(TRACE, "enter: ifidx=%d\n", ifidx);

	multicast = is_multicast_ether_addr(da);
	ifp = fws->drvr->iflist[ifidx ? ifidx + 1 : 0];
	if (WARN_ON(!ifp))
		goto done;

	/* Multicast destination and P2P clients get the interface entry.
	 * STA gets the interface entry if there is no exact match. For
	 * example, TDLS destinations have their own entry.
	 */
	entry = NULL;
	if ((/* ifp->iftype == 0 ||*/ multicast) && ifp->fws_desc)
		entry = ifp->fws_desc;

	if (entry != NULL && multicast)
		goto done;

	entry = brcmf_fws_mac_descriptor_lookup(fws, da);
	if (IS_ERR(entry))
		entry = &fws->other;

done:
	brcmf_dbg(TRACE, "exit: entry=%p\n", entry);
	return entry;
}

static void brcmf_fws_mac_desc_cleanup(struct brcmf_fws_info *fws,
				       struct brcmf_fws_mac_descriptor *entry,
691 692
				       int ifidx)
{
693
	brcmf_dbg(TRACE, "enter: entry=(ea=%pM, ifid=%d), ifidx=%d\n",
694
		  entry->ea, entry->interface_id, ifidx);
695 696
	if (entry->occupied && (ifidx == -1 || ifidx == entry->interface_id)) {
		brcmf_dbg(TRACE, "flush psq: ifidx=%d, qlen=%d\n",
697
			  ifidx, entry->psq.len);
698
		brcmf_fws_psq_flush(fws, &entry->psq, ifidx);
699 700 701 702
		entry->occupied = !!(entry->psq.len);
	}
}

703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732
static void brcmf_fws_bus_txq_cleanup(struct brcmf_fws_info *fws,
				      bool (*fn)(struct sk_buff *, void *),
				      int ifidx)
{
	struct brcmf_fws_hanger_item *hi;
	struct pktq *txq;
	struct sk_buff *skb;
	int prec;
	u32 hslot;

	brcmf_dbg(TRACE, "enter: ifidx=%d\n", ifidx);
	txq = brcmf_bus_gettxq(fws->drvr->bus_if);
	if (IS_ERR(txq)) {
		brcmf_dbg(TRACE, "no txq to clean up\n");
		return;
	}

	for (prec = 0; prec < txq->num_prec; prec++) {
		skb = brcmu_pktq_pdeq_match(txq, prec, fn, &ifidx);
		while (skb) {
			hslot = brcmf_skb_htod_tag_get_field(skb, HSLOT);
			hi = &fws->hanger.items[hslot];
			WARN_ON(skb != hi->pkt);
			hi->state = BRCMF_FWS_HANGER_ITEM_STATE_FREE;
			brcmu_pkt_buf_free_skb(skb);
			skb = brcmu_pktq_pdeq_match(txq, prec, fn, &ifidx);
		}
	}
}

733 734 735 736
static void brcmf_fws_cleanup(struct brcmf_fws_info *fws, int ifidx)
{
	int i;
	struct brcmf_fws_mac_descriptor *table;
737
	bool (*matchfn)(struct sk_buff *, void *) = NULL;
738 739 740 741 742

	brcmf_dbg(TRACE, "enter: ifidx=%d\n", ifidx);
	if (fws == NULL)
		return;

743 744 745
	if (ifidx != -1)
		matchfn = brcmf_fws_ifidx_match;

746 747 748
	/* cleanup individual nodes */
	table = &fws->nodes[0];
	for (i = 0; i < ARRAY_SIZE(fws->nodes); i++)
749
		brcmf_fws_mac_desc_cleanup(fws, &table[i], ifidx);
750

751
	brcmf_fws_mac_desc_cleanup(fws, &fws->other, ifidx);
752
	brcmf_fws_bus_txq_cleanup(fws, matchfn, ifidx);
753
	brcmf_fws_hanger_cleanup(&fws->hanger, matchfn, ifidx);
754 755
}

756 757 758 759 760 761
static int brcmf_fws_rssi_indicate(struct brcmf_fws_info *fws, s8 rssi)
{
	brcmf_dbg(CTL, "rssi %d\n", rssi);
	return 0;
}

762 763 764 765 766 767 768 769 770 771 772 773 774 775 776
static
int brcmf_fws_macdesc_indicate(struct brcmf_fws_info *fws, u8 type, u8 *data)
{
	struct brcmf_fws_mac_descriptor *entry, *existing;
	u8 mac_handle;
	u8 ifidx;
	u8 *addr;

	mac_handle = *data++;
	ifidx = *data++;
	addr = data;

	entry = &fws->nodes[mac_handle & 0x1F];
	if (type == BRCMF_FWS_TYPE_MACDESC_DEL) {
		brcmf_dbg(TRACE, "deleting mac %pM idx %d\n", addr, ifidx);
777 778 779
		if (entry->occupied)
			brcmf_fws_clear_mac_descriptor(entry);
		else
780 781 782 783
			fws->stats.mac_update_failed++;
		return 0;
	}

784 785
	brcmf_dbg(TRACE,
		  "add mac %pM handle %u idx %d\n", addr, mac_handle, ifidx);
786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811
	existing = brcmf_fws_mac_descriptor_lookup(fws, addr);
	if (IS_ERR(existing)) {
		if (!entry->occupied) {
			entry->mac_handle = mac_handle;
			brcmf_fws_init_mac_descriptor(entry, addr, ifidx);
			brcmu_pktq_init(&entry->psq, BRCMF_FWS_PSQ_PREC_COUNT,
					BRCMF_FWS_PSQ_LEN);
		} else {
			fws->stats.mac_update_failed++;
		}
	} else {
		if (entry != existing) {
			brcmf_dbg(TRACE, "relocate mac\n");
			memcpy(entry, existing,
			       offsetof(struct brcmf_fws_mac_descriptor, psq));
			entry->mac_handle = mac_handle;
			brcmf_fws_clear_mac_descriptor(existing);
		} else {
			brcmf_dbg(TRACE, "use existing\n");
			WARN_ON(entry->mac_handle != mac_handle);
			/* TODO: what should we do here: continue, reinit, .. */
		}
	}
	return 0;
}

812
static int
813
brcmf_fws_txstatus_process(struct brcmf_fws_info *fws, u8 flags, u32 hslot)
814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848
{
	int ret;
	struct sk_buff *skb;
	struct brcmf_fws_mac_descriptor *entry = NULL;

	brcmf_dbg(TRACE, "status: flags=0x%X, hslot=%d\n",
		  flags, hslot);

	if (flags == BRCMF_FWS_TXSTATUS_DISCARD)
		fws->stats.txs_discard++;
	else if (flags == BRCMF_FWS_TXSTATUS_FW_TOSSED)
		fws->stats.txs_tossed++;
	else
		brcmf_err("unexpected txstatus\n");

	ret = brcmf_fws_hanger_poppkt(&fws->hanger, hslot, &skb,
				      true);
	if (ret != 0) {
		brcmf_err("no packet in hanger slot: hslot=%d\n", hslot);
		return ret;
	}

	entry = brcmf_skbcb(skb)->mac;
	if (WARN_ON(!entry)) {
		ret = -EINVAL;
		goto done;
	}

	entry->transit_count--;

done:
	brcmf_txfinalize(fws->drvr, skb, true);
	return ret;
}

849 850 851 852 853 854 855 856 857 858 859 860 861 862
static int brcmf_fws_txstatus_indicate(struct brcmf_fws_info *fws, u8 *data)
{
	u32 status;
	u32 hslot;
	u8 flags;

	fws->stats.txs_indicate++;
	status = le32_to_cpu(*(__le32 *)data);
	flags = brcmf_txstatus_get_field(status, FLAGS);
	hslot = brcmf_txstatus_get_field(status, HSLOT);

	return brcmf_fws_txstatus_process(fws, flags, hslot);
}

863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887
static int brcmf_fws_dbg_seqnum_check(struct brcmf_fws_info *fws, u8 *data)
{
	__le32 timestamp;

	memcpy(&timestamp, &data[2], sizeof(timestamp));
	brcmf_dbg(INFO, "received: seq %d, timestamp %d\n", data[1],
		  le32_to_cpu(timestamp));
	return 0;
}

/* using macro so sparse checking does not complain
 * about locking imbalance.
 */
#define brcmf_fws_lock(drvr, flags)				\
do {								\
	flags = 0;						\
	spin_lock_irqsave(&((drvr)->fws_spinlock), (flags));	\
} while (0)

/* using macro so sparse checking does not complain
 * about locking imbalance.
 */
#define brcmf_fws_unlock(drvr, flags) \
	spin_unlock_irqrestore(&((drvr)->fws_spinlock), (flags))

888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903
static int brcmf_fws_notify_credit_map(struct brcmf_if *ifp,
				       const struct brcmf_event_msg *e,
				       void *data)
{
	struct brcmf_fws_info *fws = ifp->drvr->fws;
	int i;
	ulong flags;
	u8 *credits = data;

	brcmf_fws_lock(ifp->drvr, flags);
	for (i = 0; i < ARRAY_SIZE(fws->fifo_credit); i++)
		fws->fifo_credit[i] = *credits++;
	brcmf_fws_unlock(ifp->drvr, flags);
	return 0;
}

904 905
int brcmf_fws_init(struct brcmf_pub *drvr)
{
906
	u32 tlv = 0;
907 908 909
	int rc;

	/* enable rssi signals */
910 911
	if (drvr->fw_signals)
		tlv = BRCMF_FWS_FLAGS_RSSI_SIGNALS |
912 913
		      BRCMF_FWS_FLAGS_XONXOFF_SIGNALS |
		      BRCMF_FWS_FLAGS_CREDIT_STATUS_SIGNALS;
914 915 916 917 918 919 920 921 922 923 924 925 926 927 928

	spin_lock_init(&drvr->fws_spinlock);

	drvr->fws = kzalloc(sizeof(*(drvr->fws)), GFP_KERNEL);
	if (!drvr->fws) {
		rc = -ENOMEM;
		goto fail;
	}

	/* enable proptxtstatus signaling by default */
	rc = brcmf_fil_iovar_int_set(drvr->iflist[0], "tlv", tlv);
	if (rc < 0) {
		brcmf_err("failed to set bdcv2 tlv signaling\n");
		goto fail;
	}
929 930 931 932 933 934 935

	if (brcmf_fweh_register(drvr, BRCMF_E_FIFO_CREDIT_MAP,
				brcmf_fws_notify_credit_map)) {
		brcmf_err("register credit map handler failed\n");
		goto fail;
	}

936 937
	brcmf_fws_hanger_init(&drvr->fws->hanger);

938 939 940
	/* create debugfs file for statistics */
	brcmf_debugfs_create_fws_stats(drvr, &drvr->fws->stats);

941 942
	/* set linkage back */
	drvr->fws->drvr = drvr;
943
	drvr->fws->fcmode = fcmode;
944

945 946 947 948 949 950 951 952 953 954 955 956 957 958
	/* TODO: remove upon feature delivery */
	brcmf_err("%s bdcv2 tlv signaling [%x]\n",
		  drvr->fw_signals ? "enabled" : "disabled", tlv);
	return 0;

fail:
	/* disable flow control entirely */
	drvr->fw_signals = false;
	brcmf_fws_deinit(drvr);
	return rc;
}

void brcmf_fws_deinit(struct brcmf_pub *drvr)
{
959 960 961 962 963 964
	struct brcmf_fws_info *fws = drvr->fws;
	ulong flags;

	/* cleanup */
	brcmf_fws_lock(drvr, flags);
	brcmf_fws_cleanup(fws, -1);
965
	drvr->fws = NULL;
966 967 968 969
	brcmf_fws_unlock(drvr, flags);

	/* free top structure */
	kfree(fws);
970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019
}

int brcmf_fws_hdrpull(struct brcmf_pub *drvr, int ifidx, s16 signal_len,
		      struct sk_buff *skb)
{
	struct brcmf_fws_info *fws = drvr->fws;
	ulong flags;
	u8 *signal_data;
	s16 data_len;
	u8 type;
	u8 len;
	u8 *data;

	brcmf_dbg(TRACE, "enter: ifidx %d, skblen %u, sig %d\n",
		  ifidx, skb->len, signal_len);

	WARN_ON(signal_len > skb->len);

	/* if flow control disabled, skip to packet data and leave */
	if (!signal_len || !drvr->fw_signals) {
		skb_pull(skb, signal_len);
		return 0;
	}

	/* lock during tlv parsing */
	brcmf_fws_lock(drvr, flags);

	fws->stats.header_pulls++;
	data_len = signal_len;
	signal_data = skb->data;

	while (data_len > 0) {
		/* extract tlv info */
		type = signal_data[0];

		/* FILLER type is actually not a TLV, but
		 * a single byte that can be skipped.
		 */
		if (type == BRCMF_FWS_TYPE_FILLER) {
			signal_data += 1;
			data_len -= 1;
			continue;
		}
		len = signal_data[1];
		data = signal_data + 2;

		/* abort parsing when length invalid */
		if (data_len < len + 2)
			break;

1020 1021 1022
		if (len != brcmf_fws_get_tlv_len(fws, type))
			break;

1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035
		brcmf_dbg(INFO, "tlv type=%d (%s), len=%d\n", type,
			  brcmf_fws_get_tlv_name(type), len);
		switch (type) {
		case BRCMF_FWS_TYPE_MAC_OPEN:
		case BRCMF_FWS_TYPE_MAC_CLOSE:
		case BRCMF_FWS_TYPE_MAC_REQUEST_CREDIT:
		case BRCMF_FWS_TYPE_PKTTAG:
		case BRCMF_FWS_TYPE_INTERFACE_OPEN:
		case BRCMF_FWS_TYPE_INTERFACE_CLOSE:
		case BRCMF_FWS_TYPE_FIFO_CREDITBACK:
		case BRCMF_FWS_TYPE_PENDING_TRAFFIC_BMP:
		case BRCMF_FWS_TYPE_MAC_REQUEST_PACKET:
		case BRCMF_FWS_TYPE_HOST_REORDER_RXPKTS:
1036
		case BRCMF_FWS_TYPE_COMP_TXSTATUS:
1037
			break;
1038 1039
		case BRCMF_FWS_TYPE_MACDESC_ADD:
		case BRCMF_FWS_TYPE_MACDESC_DEL:
1040
			brcmf_fws_macdesc_indicate(fws, type, data);
1041
			break;
1042 1043 1044
		case BRCMF_FWS_TYPE_TXSTATUS:
			brcmf_fws_txstatus_indicate(fws, data);
			break;
1045 1046
		case BRCMF_FWS_TYPE_RSSI:
			brcmf_fws_rssi_indicate(fws, *data);
1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075
			break;
		case BRCMF_FWS_TYPE_TRANS_ID:
			brcmf_fws_dbg_seqnum_check(fws, data);
			break;
		default:
			fws->stats.tlv_invalid_type++;
			break;
		}

		signal_data += len + 2;
		data_len -= len + 2;
	}

	if (data_len != 0)
		fws->stats.tlv_parse_failed++;

	/* signalling processing result does
	 * not affect the actual ethernet packet.
	 */
	skb_pull(skb, signal_len);

	/* this may be a signal-only packet
	 */
	if (skb->len == 0)
		fws->stats.header_only_pkt++;

	brcmf_fws_unlock(drvr, flags);
	return 0;
}
1076

1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244
static int brcmf_fws_hdrpush(struct brcmf_fws_info *fws, struct sk_buff *skb)
{
	struct brcmf_fws_mac_descriptor *entry = brcmf_skbcb(skb)->mac;
	u8 *wlh;
	u16 data_offset;
	u8 fillers;
	__le32 pkttag = cpu_to_le32(brcmf_skbcb(skb)->htod);

	brcmf_dbg(TRACE, "enter: ea=%pM, ifidx=%u, pkttag=0x%08X\n",
		  entry->ea, entry->interface_id, le32_to_cpu(pkttag));
	/* +2 is for Type[1] and Len[1] in TLV, plus TIM signal */
	data_offset = 2 + BRCMF_FWS_TYPE_PKTTAG_LEN;
	fillers = round_up(data_offset, 4) - data_offset;
	data_offset += fillers;

	skb_push(skb, data_offset);
	wlh = skb->data;

	wlh[0] = BRCMF_FWS_TYPE_PKTTAG;
	wlh[1] = BRCMF_FWS_TYPE_PKTTAG_LEN;
	memcpy(&wlh[2], &pkttag, sizeof(pkttag));
	wlh += BRCMF_FWS_TYPE_PKTTAG_LEN + 2;

	if (fillers)
		memset(wlh, BRCMF_FWS_TYPE_FILLER, fillers);

	brcmf_proto_hdrpush(fws->drvr, brcmf_skb_if_flags_get_field(skb, INDEX),
			    data_offset >> 2, skb);
	return 0;
}

static int brcmf_fws_precommit_skb(struct brcmf_fws_info *fws, int fifo,
				   struct sk_buff *p)
{
	struct brcmf_skbuff_cb *skcb = brcmf_skbcb(p);
	struct brcmf_fws_mac_descriptor *entry = skcb->mac;
	int rc = 0;
	bool header_needed;
	int hslot = BRCMF_FWS_HANGER_MAXITEMS;
	u8 free_ctr;
	u8 ifidx;
	u8 flags;

	header_needed = skcb->state == BRCMF_FWS_SKBSTATE_NEW;

	if (header_needed) {
		/* obtaining free slot may fail, but that will be caught
		 * by the hanger push. This assures the packet has a BDC
		 * header upon return.
		 */
		hslot = brcmf_fws_hanger_get_free_slot(&fws->hanger);
		free_ctr = entry->seq[fifo];
		brcmf_skb_htod_tag_set_field(p, HSLOT, hslot);
		brcmf_skb_htod_tag_set_field(p, FREERUN, free_ctr);
		brcmf_skb_htod_tag_set_field(p, GENERATION, 1);
		entry->transit_count++;
	}
	brcmf_skb_if_flags_set_field(p, TRANSMIT, 1);
	brcmf_skb_htod_tag_set_field(p, FIFO, fifo);

	flags = BRCMF_FWS_HTOD_FLAG_PKTFROMHOST;
	if (!(skcb->if_flags & BRCMF_SKB_IF_FLAGS_CREDITCHECK_MASK)) {
		/*
		Indicate that this packet is being sent in response to an
		explicit request from the firmware side.
		*/
		flags |= BRCMF_FWS_HTOD_FLAG_PKT_REQUESTED;
	}
	brcmf_skb_htod_tag_set_field(p, FLAGS, flags);
	if (header_needed) {
		brcmf_fws_hdrpush(fws, p);
		rc = brcmf_fws_hanger_pushpkt(&fws->hanger, p, hslot);
		if (rc)
			brcmf_err("hanger push failed: rc=%d\n", rc);
	} else {
		int gen;

		/* remove old header */
		rc = brcmf_proto_hdrpull(fws->drvr, false, &ifidx, p);
		if (rc == 0) {
			hslot = brcmf_skb_htod_tag_get_field(p, HSLOT);
			brcmf_fws_hanger_get_genbit(&fws->hanger, p,
						    hslot, &gen);
			brcmf_skb_htod_tag_set_field(p, GENERATION, gen);

			/* push new header */
			brcmf_fws_hdrpush(fws, p);
		}
	}

	return rc;
}

static int brcmf_fws_commit_skb(struct brcmf_fws_info *fws, int fifo,
				struct sk_buff *skb)
{
	struct brcmf_skbuff_cb *skcb = brcmf_skbcb(skb);
	struct brcmf_fws_mac_descriptor *entry;
	struct brcmf_bus *bus = fws->drvr->bus_if;
	int rc;

	entry = skcb->mac;
	if (IS_ERR(entry))
		return PTR_ERR(entry);

	rc = brcmf_fws_precommit_skb(fws, fifo, skb);
	if (rc < 0) {
		fws->stats.generic_error++;
		goto done;
	}

	rc = brcmf_bus_txdata(bus, skb);
	if (rc < 0)
		goto done;

	entry->seq[fifo]++;
	fws->stats.pkt2bus++;
	return rc;

done:
	brcmf_txfinalize(fws->drvr, skb, false);
	return rc;
}

int brcmf_fws_process_skb(struct brcmf_if *ifp, struct sk_buff *skb)
{
	struct brcmf_pub *drvr = ifp->drvr;
	struct brcmf_skbuff_cb *skcb = brcmf_skbcb(skb);
	struct ethhdr *eh = (struct ethhdr *)(skb->data);
	ulong flags;
	u8 ifidx = ifp->ifidx;
	int fifo = BRCMF_FWS_FIFO_BCMC;
	bool multicast = is_multicast_ether_addr(eh->h_dest);

	/* determine the priority */
	if (!skb->priority)
		skb->priority = cfg80211_classify8021d(skb);

	drvr->tx_multicast += !!multicast;
	if (ntohs(eh->h_proto) == ETH_P_PAE)
		atomic_inc(&ifp->pend_8021x_cnt);

	if (!brcmf_fws_fc_active(drvr->fws)) {
		/* If the protocol uses a data header, apply it */
		brcmf_proto_hdrpush(drvr, ifidx, 0, skb);

		/* Use bus module to send data frame */
		return brcmf_bus_txdata(drvr->bus_if, skb);
	}

	/* set control buffer information */
	skcb->mac = brcmf_fws_find_mac_desc(drvr->fws, ifidx, eh->h_dest);
	skcb->state = BRCMF_FWS_SKBSTATE_NEW;
	brcmf_skb_if_flags_set_field(skb, INDEX, ifidx);
	if (!multicast)
		fifo = brcmf_fws_prio2fifo[skb->priority];
	brcmf_skb_if_flags_set_field(skb, FIFO, fifo);
	brcmf_skb_if_flags_set_field(skb, CREDITCHECK, 0);

	brcmf_dbg(TRACE, "ea=%pM, multi=%d, fifo=%d\n", eh->h_dest,
		  multicast, fifo);

	brcmf_fws_lock(drvr, flags);
	brcmf_fws_commit_skb(drvr->fws, fifo, skb);
	brcmf_fws_unlock(drvr, flags);
	return 0;
}

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void brcmf_fws_reset_interface(struct brcmf_if *ifp)
{
	struct brcmf_fws_mac_descriptor *entry = ifp->fws_desc;

	brcmf_dbg(TRACE, "enter: idx=%d\n", ifp->bssidx);
	if (!entry)
		return;

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	brcmf_fws_init_mac_descriptor(entry, ifp->mac_addr, ifp->ifidx);
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}

void brcmf_fws_add_interface(struct brcmf_if *ifp)
{
	struct brcmf_fws_mac_descriptor *entry;

	brcmf_dbg(TRACE, "enter: idx=%d, mac=%pM\n",
		  ifp->bssidx, ifp->mac_addr);
	if (!ifp->drvr->fw_signals)
		return;

	entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
	if (entry) {
		ifp->fws_desc = entry;
1268
		brcmf_fws_init_mac_descriptor(entry, ifp->mac_addr, ifp->ifidx);
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		brcmu_pktq_init(&entry->psq, BRCMF_FWS_PSQ_PREC_COUNT,
				BRCMF_FWS_PSQ_LEN);
	} else {
		brcmf_err("no firmware signalling\n");
	}
}

void brcmf_fws_del_interface(struct brcmf_if *ifp)
{
	struct brcmf_fws_mac_descriptor *entry = ifp->fws_desc;

	brcmf_dbg(TRACE, "enter: idx=%d\n", ifp->bssidx);
	if (!entry)
		return;

	ifp->fws_desc = NULL;
1285
	brcmf_fws_clear_mac_descriptor(entry);
1286
	brcmf_fws_cleanup(ifp->drvr->fws, ifp->ifidx);
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	kfree(entry);
}
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bool brcmf_fws_fc_active(struct brcmf_fws_info *fws)
{
	if (!fws)
		return false;

	brcmf_dbg(TRACE, "enter: mode=%d\n", fws->fcmode);
	return fws->fcmode != BRCMF_FWS_FCMODE_NONE;
}
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void brcmf_fws_bustxfail(struct brcmf_fws_info *fws, struct sk_buff *skb)
{
	ulong flags;

	brcmf_fws_lock(fws->drvr, flags);
	brcmf_fws_txstatus_process(fws, BRCMF_FWS_TXSTATUS_FW_TOSSED,
				   brcmf_skb_htod_tag_get_field(skb, HSLOT));
	brcmf_fws_unlock(fws->drvr, flags);
}