--- /dev/null
+/*
+ * 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>
+#include <linux/if_ether.h>
+#include <linux/spinlock.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/err.h>
+#include <uapi/linux/nl80211.h>
+
+#include <brcmu_utils.h>
+#include <brcmu_wifi.h>
+#include "dhd.h"
+#include "dhd_dbg.h"
+#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)
+
+/**
+ * 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
+
+/**
+ * enum brcmf_fws_tlv_len - length values for tlvs.
+ */
+#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
+
+#ifdef DEBUG
+/**
+ * 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 */
+
+/**
+ * flags used to enable tlv signalling from firmware.
+ */
+#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_HANGER_MAXITEMS 1024
+#define BRCMF_FWS_HANGER_ITEM_STATE_FREE 1
+#define BRCMF_FWS_HANGER_ITEM_STATE_INUSE 2
+#define BRCMF_FWS_HANGER_ITEM_STATE_INUSE_SUPPRESSED 3
+
+#define BRCMF_FWS_STATE_OPEN 1
+#define BRCMF_FWS_STATE_CLOSE 2
+
+#define BRCMF_FWS_FCMODE_NONE 0
+#define BRCMF_FWS_FCMODE_IMPLIED_CREDIT 1
+#define BRCMF_FWS_FCMODE_EXPLICIT_CREDIT 2
+
+#define BRCMF_FWS_MAC_DESC_TABLE_SIZE 32
+#define BRCMF_FWS_MAX_IFNUM 16
+#define BRCMF_FWS_MAC_DESC_ID_INVALID 0xff
+
+#define BRCMF_FWS_HOSTIF_FLOWSTATE_OFF 0
+#define BRCMF_FWS_HOSTIF_FLOWSTATE_ON 1
+
+/**
+ * FWFC 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 wlc except 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_FWS_PKTTAG_GENERATION_MASK 0x80000000
+#define BRCMF_FWS_PKTTAG_GENERATION_SHIFT 31
+#define BRCMF_FWS_PKTTAG_FLAGS_MASK 0x78000000
+#define BRCMF_FWS_PKTTAG_FLAGS_SHIFT 27
+#define BRCMF_FWS_PKTTAG_FIFO_MASK 0x07000000
+#define BRCMF_FWS_PKTTAG_FIFO_SHIFT 24
+#define BRCMF_FWS_PKTTAG_HSLOT_MASK 0x00ffff00
+#define BRCMF_FWS_PKTTAG_HSLOT_SHIFT 8
+#define BRCMF_FWS_PKTTAG_FREERUN_MASK 0x000000ff
+#define BRCMF_FWS_PKTTAG_FREERUN_SHIFT 0
+
+#define brcmf_fws_pkttag_set_field(var, field, value) \
+ brcmu_maskset32((var), BRCMF_FWS_PKTTAG_ ## field ## _MASK, \
+ BRCMF_FWS_PKTTAG_ ## field ## _SHIFT, (value))
+#define brcmf_fws_pkttag_get_field(var, field) \
+ brcmu_maskget32((var), BRCMF_FWS_PKTTAG_ ## field ## _MASK, \
+ BRCMF_FWS_PKTTAG_ ## field ## _SHIFT)
+
+struct brcmf_fws_info {
+ struct brcmf_pub *drvr;
+ struct brcmf_fws_stats stats;
+};
+
+static int brcmf_fws_rssi_indicate(struct brcmf_fws_info *fws, s8 rssi)
+{
+ brcmf_dbg(CTL, "rssi %d\n", rssi);
+ return 0;
+}
+
+static int brcmf_fws_dbg_seqnum_check(struct brcmf_fws_info *fws, u8 *data)
+{
+ __le32 timestamp;
+
+ memcpy(×tamp, &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))
+
+int brcmf_fws_init(struct brcmf_pub *drvr)
+{
+ u32 tlv;
+ int rc;
+
+ /* enable rssi signals */
+ tlv = drvr->fw_signals ? BRCMF_FWS_FLAGS_RSSI_SIGNALS : 0;
+
+ 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;
+ }
+ /* set linkage back */
+ drvr->fws->drvr = drvr;
+
+ /* create debugfs file for statistics */
+ brcmf_debugfs_create_fws_stats(drvr, &drvr->fws->stats);
+
+ /* 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)
+{
+ /* free top structure */
+ kfree(drvr->fws);
+ drvr->fws = NULL;
+}
+
+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;
+
+ 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:
+ WARN_ON(len != BRCMF_FWS_TYPE_MAC_OPEN_LEN);
+ break;
+ case BRCMF_FWS_TYPE_MAC_REQUEST_CREDIT:
+ WARN_ON(len != BRCMF_FWS_TYPE_MAC_REQUEST_CREDIT_LEN);
+ break;
+ case BRCMF_FWS_TYPE_TXSTATUS:
+ WARN_ON(len != BRCMF_FWS_TYPE_TXSTATUS_LEN);
+ break;
+ case BRCMF_FWS_TYPE_PKTTAG:
+ WARN_ON(len != BRCMF_FWS_TYPE_PKTTAG_LEN);
+ break;
+ case BRCMF_FWS_TYPE_MACDESC_ADD:
+ case BRCMF_FWS_TYPE_MACDESC_DEL:
+ WARN_ON(len != BRCMF_FWS_TYPE_MACDESC_ADD_LEN);
+ break;
+ case BRCMF_FWS_TYPE_RSSI:
+ WARN_ON(len != BRCMF_FWS_TYPE_RSSI_LEN);
+ brcmf_fws_rssi_indicate(fws, *(s8 *)data);
+ break;
+ case BRCMF_FWS_TYPE_INTERFACE_OPEN:
+ case BRCMF_FWS_TYPE_INTERFACE_CLOSE:
+ WARN_ON(len != BRCMF_FWS_TYPE_INTERFACE_OPEN_LEN);
+ break;
+ case BRCMF_FWS_TYPE_FIFO_CREDITBACK:
+ WARN_ON(len != BRCMF_FWS_TYPE_FIFO_CREDITBACK_LEN);
+ break;
+ case BRCMF_FWS_TYPE_PENDING_TRAFFIC_BMP:
+ WARN_ON(len != BRCMF_FWS_TYPE_PENDING_TRAFFIC_BMP_LEN);
+ break;
+ case BRCMF_FWS_TYPE_MAC_REQUEST_PACKET:
+ WARN_ON(len != BRCMF_FWS_TYPE_MAC_REQUEST_PACKET_LEN);
+ break;
+ case BRCMF_FWS_TYPE_HOST_REORDER_RXPKTS:
+ WARN_ON(len != BRCMF_FWS_TYPE_HOST_REORDER_RXPKTS_LEN);
+ break;
+ case BRCMF_FWS_TYPE_TRANS_ID:
+ WARN_ON(len != BRCMF_FWS_TYPE_TRANS_ID_LEN);
+ brcmf_fws_dbg_seqnum_check(fws, data);
+ break;
+ case BRCMF_FWS_TYPE_COMP_TXSTATUS:
+ WARN_ON(len != BRCMF_FWS_TYPE_COMP_TXSTATUS_LEN);
+ 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;
+}
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