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brcmsmac: Improve tx trace and debug support 

Add the brcmsmac_tx trace system for tx debugging. Existing code to dump
tx status and descriptors are converted to using tracepoints, allowing
for more efficient collection and post-processing of this data. These
tracepoints are placed to collect data for all tx frames instead of only
on errors. Logging of tx errors is also improved.

Acked-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Tested-by: Daniel Wagner <wagi@monom.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Seth Forshee 2012-11-15 08:08:09 -06:00 committed by John W. Linville
parent 5211fa2c48
commit cdf4352f5c
4 changed files with 94 additions and 250 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/net/wireless/brcm80211/brcmsmac/ampdu.c
View File

@ -22,6 +22,7 @@
#include "main.h" #include "main.h"
#include "ampdu.h" #include "ampdu.h"
#include "debug.h" #include "debug.h"
#include "brcms_trace_events.h"
/* max number of mpdus in an ampdu */ /* max number of mpdus in an ampdu */
#define AMPDU_MAX_MPDU 32 #define AMPDU_MAX_MPDU 32
@ -930,12 +931,6 @@ brcms_c_ampdu_dotxstatus_complete(struct ampdu_info *ampdu, struct scb *scb,
brcms_err(wlc->hw->d11core, brcms_err(wlc->hw->d11core,
"%s: ampdu tx phy error (0x%x)\n", "%s: ampdu tx phy error (0x%x)\n",
__func__, txs->phyerr); __func__, txs->phyerr);
if (brcm_msg_level & BRCM_DL_INFO) {
brcmu_prpkt("txpkt (AMPDU)", p);
brcms_c_print_txdesc((struct d11txh *) p->data);
}
brcms_c_print_txstatus(txs);
} }
} }
@ -948,6 +943,8 @@ brcms_c_ampdu_dotxstatus_complete(struct ampdu_info *ampdu, struct scb *scb,
h = (struct ieee80211_hdr *)(plcp + D11_PHY_HDR_LEN); h = (struct ieee80211_hdr *)(plcp + D11_PHY_HDR_LEN);
seq = le16_to_cpu(h->seq_ctrl) >> SEQNUM_SHIFT; seq = le16_to_cpu(h->seq_ctrl) >> SEQNUM_SHIFT;
trace_brcms_txdesc(&wlc->hw->d11core->dev, txh, sizeof(*txh));
if (tot_mpdu == 0) { if (tot_mpdu == 0) {
mcs = plcp[0] & MIMO_PLCP_MCS_MASK; mcs = plcp[0] & MIMO_PLCP_MCS_MASK;
mimoantsel = le16_to_cpu(txh->ABI_MimoAntSel); mimoantsel = le16_to_cpu(txh->ABI_MimoAntSel);
@ -1077,6 +1074,8 @@ brcms_c_ampdu_dotxstatus(struct ampdu_info *ampdu, struct scb *scb,
while (p) { while (p) {
tx_info = IEEE80211_SKB_CB(p); tx_info = IEEE80211_SKB_CB(p);
txh = (struct d11txh *) p->data; txh = (struct d11txh *) p->data;
trace_brcms_txdesc(&wlc->hw->d11core->dev, txh,
sizeof(*txh));
mcl = le16_to_cpu(txh->MacTxControlLow); mcl = le16_to_cpu(txh->MacTxControlLow);
brcmu_pkt_buf_free_skb(p); brcmu_pkt_buf_free_skb(p);
/* break out if last packet of ampdu */ /* break out if last packet of ampdu */

53
drivers/net/wireless/brcm80211/brcmsmac/brcms_trace_events.h
View File

@ -18,6 +18,8 @@
#define __TRACE_BRCMSMAC_H #define __TRACE_BRCMSMAC_H
#include <linux/types.h>
#include <linux/device.h>
#include <linux/tracepoint.h> #include <linux/tracepoint.h>
#include "mac80211_if.h" #include "mac80211_if.h"
@ -83,6 +85,57 @@ TRACE_EVENT(brcms_dpc,
) )
); );
#undef TRACE_SYSTEM
#define TRACE_SYSTEM brcmsmac_tx
TRACE_EVENT(brcms_txdesc,
TP_PROTO(const struct device *dev,
void *txh, size_t txh_len),
TP_ARGS(dev, txh, txh_len),
TP_STRUCT__entry(
__string(dev, dev_name(dev))
__dynamic_array(u8, txh, txh_len)
),
TP_fast_assign(
__assign_str(dev, dev_name(dev));
memcpy(__get_dynamic_array(txh), txh, txh_len);
),
TP_printk("[%s] txdesc", __get_str(dev))
);
TRACE_EVENT(brcms_txstatus,
TP_PROTO(const struct device *dev, u16 framelen, u16 frameid,
u16 status, u16 lasttxtime, u16 sequence, u16 phyerr,
u16 ackphyrxsh),
TP_ARGS(dev, framelen, frameid, status, lasttxtime, sequence, phyerr,
ackphyrxsh),
TP_STRUCT__entry(
__string(dev, dev_name(dev))
__field(u16, framelen)
__field(u16, frameid)
__field(u16, status)
__field(u16, lasttxtime)
__field(u16, sequence)
__field(u16, phyerr)
__field(u16, ackphyrxsh)
),
TP_fast_assign(
__assign_str(dev, dev_name(dev));
__entry->framelen = framelen;
__entry->frameid = frameid;
__entry->status = status;
__entry->lasttxtime = lasttxtime;
__entry->sequence = sequence;
__entry->phyerr = phyerr;
__entry->ackphyrxsh = ackphyrxsh;
),
TP_printk("[%s] FrameId %#04x TxStatus %#04x LastTxTime %#04x "
"Seq %#04x PHYTxStatus %#04x RxAck %#04x",
__get_str(dev), __entry->frameid, __entry->status,
__entry->lasttxtime, __entry->sequence, __entry->phyerr,
__entry->ackphyrxsh)
);
#undef TRACE_SYSTEM #undef TRACE_SYSTEM
#define TRACE_SYSTEM brcmsmac_msg #define TRACE_SYSTEM brcmsmac_msg

271
drivers/net/wireless/brcm80211/brcmsmac/main.c
View File

@ -36,6 +36,7 @@
#include "soc.h" #include "soc.h"
#include "dma.h" #include "dma.h"
#include "debug.h" #include "debug.h"
#include "brcms_trace_events.h"
/* watchdog timer, in unit of ms */ /* watchdog timer, in unit of ms */
#define TIMER_INTERVAL_WATCHDOG 1000 #define TIMER_INTERVAL_WATCHDOG 1000
@ -862,7 +863,7 @@ brcms_c_dotxstatus(struct brcms_c_info *wlc, struct tx_status *txs)
struct sk_buff *p = NULL; struct sk_buff *p = NULL;
uint queue = NFIFO; uint queue = NFIFO;
struct dma_pub *dma = NULL; struct dma_pub *dma = NULL;
struct d11txh *txh; struct d11txh *txh = NULL;
struct scb *scb = NULL; struct scb *scb = NULL;
bool free_pdu; bool free_pdu;
int tx_rts, tx_frame_count, tx_rts_count; int tx_rts, tx_frame_count, tx_rts_count;
@ -875,6 +876,10 @@ brcms_c_dotxstatus(struct brcms_c_info *wlc, struct tx_status *txs)
int i; int i;
bool fatal = true; bool fatal = true;
trace_brcms_txstatus(&wlc->hw->d11core->dev, txs->framelen,
txs->frameid, txs->status, txs->lasttxtime,
txs->sequence, txs->phyerr, txs->ackphyrxsh);
/* discard intermediate indications for ucode with one legitimate case: /* discard intermediate indications for ucode with one legitimate case:
* e.g. if "useRTS" is set. ucode did a successful rts/cts exchange, * e.g. if "useRTS" is set. ucode did a successful rts/cts exchange,
* but the subsequent tx of DATA failed. so it will start rts/cts * but the subsequent tx of DATA failed. so it will start rts/cts
@ -888,29 +893,30 @@ brcms_c_dotxstatus(struct brcms_c_info *wlc, struct tx_status *txs)
} }
queue = txs->frameid & TXFID_QUEUE_MASK; queue = txs->frameid & TXFID_QUEUE_MASK;
if (queue >= NFIFO) if (queue >= NFIFO) {
brcms_err(wlc->hw->d11core, "queue %u >= NFIFO\n", queue);
goto out; goto out;
}
dma = wlc->hw->di[queue]; dma = wlc->hw->di[queue];
p = dma_getnexttxp(wlc->hw->di[queue], DMA_RANGE_TRANSMITTED); p = dma_getnexttxp(wlc->hw->di[queue], DMA_RANGE_TRANSMITTED);
if (p == NULL) if (p == NULL) {
brcms_err(wlc->hw->d11core, "dma_getnexttxp returned null!\n");
goto out; goto out;
}
txh = (struct d11txh *) (p->data); txh = (struct d11txh *) (p->data);
mcl = le16_to_cpu(txh->MacTxControlLow); mcl = le16_to_cpu(txh->MacTxControlLow);
if (txs->phyerr) { if (txs->phyerr)
if (brcm_msg_level & BRCM_DL_INFO) { brcms_err(wlc->hw->d11core, "phyerr 0x%x, rate 0x%x\n",
brcms_err(wlc->hw->d11core, "phyerr 0x%x, rate 0x%x\n", txs->phyerr, txh->MainRates);
txs->phyerr, txh->MainRates);
brcms_c_print_txdesc(txh);
}
brcms_c_print_txstatus(txs);
}
if (txs->frameid != le16_to_cpu(txh->TxFrameID)) if (txs->frameid != le16_to_cpu(txh->TxFrameID)) {
brcms_err(wlc->hw->d11core, "frameid != txh->TxFrameID\n");
goto out; goto out;
}
tx_info = IEEE80211_SKB_CB(p); tx_info = IEEE80211_SKB_CB(p);
h = (struct ieee80211_hdr *)((u8 *) (txh + 1) + D11_PHY_HDR_LEN); h = (struct ieee80211_hdr *)((u8 *) (txh + 1) + D11_PHY_HDR_LEN);
@ -923,11 +929,20 @@ brcms_c_dotxstatus(struct brcms_c_info *wlc, struct tx_status *txs)
goto out; goto out;
} }
/*
* brcms_c_ampdu_dotxstatus() will trace tx descriptors for AMPDU
* frames; this traces them for the rest.
*/
trace_brcms_txdesc(&wlc->hw->d11core->dev, txh, sizeof(*txh));
supr_status = txs->status & TX_STATUS_SUPR_MASK; supr_status = txs->status & TX_STATUS_SUPR_MASK;
if (supr_status == TX_STATUS_SUPR_BADCH) if (supr_status == TX_STATUS_SUPR_BADCH) {
unsigned xfts = le16_to_cpu(txh->XtraFrameTypes);
brcms_dbg_tx(wlc->hw->d11core, brcms_dbg_tx(wlc->hw->d11core,
"Pkt tx suppressed, possibly channel %d\n", "Pkt tx suppressed, dest chan %u, current %d\n",
(xfts >> XFTS_CHANNEL_SHIFT) & 0xff,
CHSPEC_CHANNEL(wlc->default_bss->chanspec)); CHSPEC_CHANNEL(wlc->default_bss->chanspec));
}
tx_rts = le16_to_cpu(txh->MacTxControlLow) & TXC_SENDRTS; tx_rts = le16_to_cpu(txh->MacTxControlLow) & TXC_SENDRTS;
tx_frame_count = tx_frame_count =
@ -1018,8 +1033,13 @@ brcms_c_dotxstatus(struct brcms_c_info *wlc, struct tx_status *txs)
fatal = false; fatal = false;
out: out:
if (fatal && p) if (fatal) {
brcmu_pkt_buf_free_skb(p); if (txh)
trace_brcms_txdesc(&wlc->hw->d11core->dev, txh,
sizeof(*txh));
if (p)
brcmu_pkt_buf_free_skb(p);
}
if (dma && queue < NFIFO) { if (dma && queue < NFIFO) {
u16 ac_queue = brcms_fifo_to_ac(queue); u16 ac_queue = brcms_fifo_to_ac(queue);
@ -1049,8 +1069,6 @@ brcms_b_txstatus(struct brcms_hardware *wlc_hw, bool bound, bool *fatal)
*/ */
uint max_tx_num = bound ? TXSBND : -1; uint max_tx_num = bound ? TXSBND : -1;
brcms_dbg_tx(core, "wl%d\n", wlc_hw->unit);
txs = &txstatus; txs = &txstatus;
core = wlc_hw->d11core; core = wlc_hw->d11core;
*fatal = false; *fatal = false;
@ -5662,45 +5680,6 @@ int brcms_c_module_unregister(struct brcms_pub *pub, const char *name,
return -ENODATA; return -ENODATA;
} }
void brcms_c_print_txstatus(struct tx_status *txs)
{
pr_debug("\ntxpkt (MPDU) Complete\n");
pr_debug("FrameID: %04x TxStatus: %04x\n", txs->frameid, txs->status);
pr_debug("[15:12] %d frame attempts\n",
(txs->status & TX_STATUS_FRM_RTX_MASK) >>
TX_STATUS_FRM_RTX_SHIFT);
pr_debug(" [11:8] %d rts attempts\n",
(txs->status & TX_STATUS_RTS_RTX_MASK) >>
TX_STATUS_RTS_RTX_SHIFT);
pr_debug(" [7] %d PM mode indicated\n",
txs->status & TX_STATUS_PMINDCTD ? 1 : 0);
pr_debug(" [6] %d intermediate status\n",
txs->status & TX_STATUS_INTERMEDIATE ? 1 : 0);
pr_debug(" [5] %d AMPDU\n",
txs->status & TX_STATUS_AMPDU ? 1 : 0);
pr_debug(" [4:2] %d Frame Suppressed Reason (%s)\n",
(txs->status & TX_STATUS_SUPR_MASK) >> TX_STATUS_SUPR_SHIFT,
(const char *[]) {
"None",
"PMQ Entry",
"Flush request",
"Previous frag failure",
"Channel mismatch",
"Lifetime Expiry",
"Underflow"
} [(txs->status & TX_STATUS_SUPR_MASK) >>
TX_STATUS_SUPR_SHIFT]);
pr_debug(" [1] %d acked\n",
txs->status & TX_STATUS_ACK_RCV ? 1 : 0);
pr_debug("LastTxTime: %04x Seq: %04x PHYTxStatus: %04x RxAckRSSI: %04x RxAckSQ: %04x\n",
txs->lasttxtime, txs->sequence, txs->phyerr,
(txs->ackphyrxsh & PRXS1_JSSI_MASK) >> PRXS1_JSSI_SHIFT,
(txs->ackphyrxsh & PRXS1_SQ_MASK) >> PRXS1_SQ_SHIFT);
}
static bool brcms_c_chipmatch_pci(struct bcma_device *core) static bool brcms_c_chipmatch_pci(struct bcma_device *core)
{ {
struct pci_dev *pcidev = core->bus->host_pci; struct pci_dev *pcidev = core->bus->host_pci;
@ -5749,184 +5728,6 @@ bool brcms_c_chipmatch(struct bcma_device *core)
} }
} }
#if defined(DEBUG)
void brcms_c_print_txdesc(struct d11txh *txh)
{
u16 mtcl = le16_to_cpu(txh->MacTxControlLow);
u16 mtch = le16_to_cpu(txh->MacTxControlHigh);
u16 mfc = le16_to_cpu(txh->MacFrameControl);
u16 tfest = le16_to_cpu(txh->TxFesTimeNormal);
u16 ptcw = le16_to_cpu(txh->PhyTxControlWord);
u16 ptcw_1 = le16_to_cpu(txh->PhyTxControlWord_1);
u16 ptcw_1_Fbr = le16_to_cpu(txh->PhyTxControlWord_1_Fbr);
u16 ptcw_1_Rts = le16_to_cpu(txh->PhyTxControlWord_1_Rts);
u16 ptcw_1_FbrRts = le16_to_cpu(txh->PhyTxControlWord_1_FbrRts);
u16 mainrates = le16_to_cpu(txh->MainRates);
u16 xtraft = le16_to_cpu(txh->XtraFrameTypes);
u8 *iv = txh->IV;
u8 *ra = txh->TxFrameRA;
u16 tfestfb = le16_to_cpu(txh->TxFesTimeFallback);
u8 *rtspfb = txh->RTSPLCPFallback;
u16 rtsdfb = le16_to_cpu(txh->RTSDurFallback);
u8 *fragpfb = txh->FragPLCPFallback;
u16 fragdfb = le16_to_cpu(txh->FragDurFallback);
u16 mmodelen = le16_to_cpu(txh->MModeLen);
u16 mmodefbrlen = le16_to_cpu(txh->MModeFbrLen);
u16 tfid = le16_to_cpu(txh->TxFrameID);
u16 txs = le16_to_cpu(txh->TxStatus);
u16 mnmpdu = le16_to_cpu(txh->MaxNMpdus);
u16 mabyte = le16_to_cpu(txh->MaxABytes_MRT);
u16 mabyte_f = le16_to_cpu(txh->MaxABytes_FBR);
u16 mmbyte = le16_to_cpu(txh->MinMBytes);
u8 *rtsph = txh->RTSPhyHeader;
struct ieee80211_rts rts = txh->rts_frame;
/* add plcp header along with txh descriptor */
brcmu_dbg_hex_dump(txh, sizeof(struct d11txh) + 48,
"Raw TxDesc + plcp header:\n");
pr_debug("TxCtlLow: %04x ", mtcl);
pr_debug("TxCtlHigh: %04x ", mtch);
pr_debug("FC: %04x ", mfc);
pr_debug("FES Time: %04x\n", tfest);
pr_debug("PhyCtl: %04x%s ", ptcw,
(ptcw & PHY_TXC_SHORT_HDR) ? " short" : "");
pr_debug("PhyCtl_1: %04x ", ptcw_1);
pr_debug("PhyCtl_1_Fbr: %04x\n", ptcw_1_Fbr);
pr_debug("PhyCtl_1_Rts: %04x ", ptcw_1_Rts);
pr_debug("PhyCtl_1_Fbr_Rts: %04x\n", ptcw_1_FbrRts);
pr_debug("MainRates: %04x ", mainrates);
pr_debug("XtraFrameTypes: %04x ", xtraft);
pr_debug("\n");
print_hex_dump_bytes("SecIV:", DUMP_PREFIX_OFFSET, iv, sizeof(txh->IV));
print_hex_dump_bytes("RA:", DUMP_PREFIX_OFFSET,
ra, sizeof(txh->TxFrameRA));
pr_debug("Fb FES Time: %04x ", tfestfb);
print_hex_dump_bytes("Fb RTS PLCP:", DUMP_PREFIX_OFFSET,
rtspfb, sizeof(txh->RTSPLCPFallback));
pr_debug("RTS DUR: %04x ", rtsdfb);
print_hex_dump_bytes("PLCP:", DUMP_PREFIX_OFFSET,
fragpfb, sizeof(txh->FragPLCPFallback));
pr_debug("DUR: %04x", fragdfb);
pr_debug("\n");
pr_debug("MModeLen: %04x ", mmodelen);
pr_debug("MModeFbrLen: %04x\n", mmodefbrlen);
pr_debug("FrameID: %04x\n", tfid);
pr_debug("TxStatus: %04x\n", txs);
pr_debug("MaxNumMpdu: %04x\n", mnmpdu);
pr_debug("MaxAggbyte: %04x\n", mabyte);
pr_debug("MaxAggbyte_fb: %04x\n", mabyte_f);
pr_debug("MinByte: %04x\n", mmbyte);
print_hex_dump_bytes("RTS PLCP:", DUMP_PREFIX_OFFSET,
rtsph, sizeof(txh->RTSPhyHeader));
print_hex_dump_bytes("RTS Frame:", DUMP_PREFIX_OFFSET,
(u8 *)&rts, sizeof(txh->rts_frame));
pr_debug("\n");
}
#endif /* defined(DEBUG) */
#if defined(DEBUG)
static int
brcms_c_format_flags(const struct brcms_c_bit_desc *bd, u32 flags, char *buf,
int len)
{
int i;
char *p = buf;
char hexstr[16];
int slen = 0, nlen = 0;
u32 bit;
const char *name;
if (len < 2 || !buf)
return 0;
buf[0] = '\0';
for (i = 0; flags != 0; i++) {
bit = bd[i].bit;
name = bd[i].name;
if (bit == 0 && flags != 0) {
/* print any unnamed bits */
snprintf(hexstr, 16, "0x%X", flags);
name = hexstr;
flags = 0; /* exit loop */
} else if ((flags & bit) == 0)
continue;
flags &= ~bit;
nlen = strlen(name);
slen += nlen;
/* count btwn flag space */
if (flags != 0)
slen += 1;
/* need NULL char as well */
if (len <= slen)
break;
/* copy NULL char but don't count it */
strncpy(p, name, nlen + 1);
p += nlen;
/* copy btwn flag space and NULL char */
if (flags != 0)
p += snprintf(p, 2, " ");
len -= slen;
}
/* indicate the str was too short */
if (flags != 0) {
if (len < 2)
p -= 2 - len; /* overwrite last char */
p += snprintf(p, 2, ">");
}
return (int)(p - buf);
}
#endif /* defined(DEBUG) */
#if defined(DEBUG)
void brcms_c_print_rxh(struct d11rxhdr *rxh)
{
u16 len = rxh->RxFrameSize;
u16 phystatus_0 = rxh->PhyRxStatus_0;
u16 phystatus_1 = rxh->PhyRxStatus_1;
u16 phystatus_2 = rxh->PhyRxStatus_2;
u16 phystatus_3 = rxh->PhyRxStatus_3;
u16 macstatus1 = rxh->RxStatus1;
u16 macstatus2 = rxh->RxStatus2;
char flagstr[64];
char lenbuf[20];
static const struct brcms_c_bit_desc macstat_flags[] = {
{RXS_FCSERR, "FCSErr"},
{RXS_RESPFRAMETX, "Reply"},
{RXS_PBPRES, "PADDING"},
{RXS_DECATMPT, "DeCr"},
{RXS_DECERR, "DeCrErr"},
{RXS_BCNSENT, "Bcn"},
{0, NULL}
};
brcmu_dbg_hex_dump(rxh, sizeof(struct d11rxhdr), "Raw RxDesc:\n");
brcms_c_format_flags(macstat_flags, macstatus1, flagstr, 64);
snprintf(lenbuf, sizeof(lenbuf), "0x%x", len);
pr_debug("RxFrameSize: %6s (%d)%s\n", lenbuf, len,
(rxh->PhyRxStatus_0 & PRXS0_SHORTH) ? " short preamble" : "");
pr_debug("RxPHYStatus: %04x %04x %04x %04x\n",
phystatus_0, phystatus_1, phystatus_2, phystatus_3);
pr_debug("RxMACStatus: %x %s\n", macstatus1, flagstr);
pr_debug("RXMACaggtype: %x\n",
(macstatus2 & RXS_AGGTYPE_MASK));
pr_debug("RxTSFTime: %04x\n", rxh->RxTSFTime);
}
#endif /* defined(DEBUG) */
u16 brcms_b_rate_shm_offset(struct brcms_hardware *wlc_hw, u8 rate) u16 brcms_b_rate_shm_offset(struct brcms_hardware *wlc_hw, u8 rate)
{ {
u16 table_ptr; u16 table_ptr;

9
drivers/net/wireless/brcm80211/brcmsmac/main.h
View File

@ -612,18 +612,9 @@ struct brcms_bss_cfg {
extern int brcms_c_txfifo(struct brcms_c_info *wlc, uint fifo, extern int brcms_c_txfifo(struct brcms_c_info *wlc, uint fifo,
struct sk_buff *p); struct sk_buff *p);
extern void brcms_c_print_txstatus(struct tx_status *txs);
extern int brcms_b_xmtfifo_sz_get(struct brcms_hardware *wlc_hw, uint fifo, extern int brcms_b_xmtfifo_sz_get(struct brcms_hardware *wlc_hw, uint fifo,
uint *blocks); uint *blocks);
#if defined(DEBUG)
extern void brcms_c_print_txdesc(struct d11txh *txh);
#else
static inline void brcms_c_print_txdesc(struct d11txh *txh)
{
}
#endif
extern int brcms_c_set_gmode(struct brcms_c_info *wlc, u8 gmode, bool config); extern int brcms_c_set_gmode(struct brcms_c_info *wlc, u8 gmode, bool config);
extern void brcms_c_mac_promisc(struct brcms_c_info *wlc, uint filter_flags); extern void brcms_c_mac_promisc(struct brcms_c_info *wlc, uint filter_flags);
extern u16 brcms_c_calc_lsig_len(struct brcms_c_info *wlc, u32 ratespec, extern u16 brcms_c_calc_lsig_len(struct brcms_c_info *wlc, u32 ratespec,