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net80211: improve scan debugging

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While debugging other problems I ran into the case where net80211
was thinking a scan was ongoing and new scans could not be started
but given other logging there was clearly no more scan running.
It was hard after the fact to quickly determine enough state to
reconstruct or validate assumptions.

Improve a MSG_SCAN debug logging and implement _db_show_scan() ddb
output which can be printed along with show com /S or /a.

Sponsored by:	The FreeBSD Foundation
MFC after:	3 days
This commit is contained in:
Bjoern A. Zeeb 2023-09-14 17:36:29 +00:00
parent 778da03b12
commit 33396ec29f
3 changed files with 77 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

74
sys/net80211/ieee80211_ddb.c
View File

@ -67,7 +67,7 @@
static void _db_show_sta(const struct ieee80211_node *);
static void _db_show_vap(const struct ieee80211vap *, int, int);
static void _db_show_com(const struct ieee80211com *,
int showvaps, int showsta, int showmesh, int showprocs);
int showvaps, int showsta, int showmesh, int showprocs, int);
static void _db_show_all_vaps(void *, struct ieee80211com *);
@ -132,7 +132,7 @@ DB_SHOW_COMMAND(vap, db_show_vap)
DB_SHOW_COMMAND(com, db_show_com)
{
const struct ieee80211com *ic;
int i, showprocs = 0, showvaps = 0, showsta = 0, showmesh = 0;
int i, showprocs = 0, showvaps = 0, showsta = 0, showmesh = 0, showscan = 0;
if (!have_addr) {
db_printf("usage: show com <addr>\n");
@ -141,7 +141,10 @@ DB_SHOW_COMMAND(com, db_show_com)
for (i = 0; modif[i] != '\0'; i++)
switch (modif[i]) {
case 'a':
showsta = showmesh = showvaps = showprocs = 1;
showsta = showmesh = showvaps = showprocs = showscan = 1;
break;
case 'S':
showscan = 1;
break;
case 's':
showsta = 1;
@ -158,7 +161,7 @@ DB_SHOW_COMMAND(com, db_show_com)
}
ic = (const struct ieee80211com *) addr;
_db_show_com(ic, showvaps, showsta, showmesh, showprocs);
_db_show_com(ic, showvaps, showsta, showmesh, showprocs, showscan);
}
DB_SHOW_ALL_COMMAND(vaps, db_show_all_vaps)
@ -345,6 +348,61 @@ _db_show_tdma(const char *sep, const struct ieee80211_tdma_state *ts, int showpr
}
#endif /* IEEE80211_SUPPORT_TDMA */
static void
_db_show_scan(const struct ieee80211_scan_state *ss, int showprocs)
{
int i;
const struct ieee80211_scanner *ss_ops;
db_printf("SCAN %p:", ss);
db_printf(" vap %p ic %p", ss->ss_vap, ss->ss_ic);
db_printf("\n");
db_printf("\tss_ops %p (%s) ss_priv %p",
ss->ss_ops, ss->ss_ops->scan_name, ss->ss_priv);
db_printf("\n");
if (showprocs) {
ss_ops = ss->ss_ops;
DB_PRINTSYM("\t", "scan_attach", ss_ops->scan_attach);
DB_PRINTSYM("\t", "scan_detach", ss_ops->scan_detach);
DB_PRINTSYM("\t", "scan_start", ss_ops->scan_start);
DB_PRINTSYM("\t", "scan_restart", ss_ops->scan_restart);
DB_PRINTSYM("\t", "scan_cancel", ss_ops->scan_cancel);
DB_PRINTSYM("\t", "scan_end", ss_ops->scan_end);
DB_PRINTSYM("\t", "scan_flush", ss_ops->scan_flush);
DB_PRINTSYM("\t", "scan_pickchan", ss_ops->scan_pickchan);
DB_PRINTSYM("\t", "scan_add", ss_ops->scan_add);
DB_PRINTSYM("\t", "scan_age", ss_ops->scan_age);
DB_PRINTSYM("\t", "scan_assoc_fail", ss_ops->scan_assoc_fail);
DB_PRINTSYM("\t", "scan_assoc_success", ss_ops->scan_assoc_success);
DB_PRINTSYM("\t", "scan_iterate", ss_ops->scan_iterate);
DB_PRINTSYM("\t", "scan_spare0", ss_ops->scan_spare0);
DB_PRINTSYM("\t", "scan_spare1", ss_ops->scan_spare1);
DB_PRINTSYM("\t", "scan_spare2", ss_ops->scan_spare2);
DB_PRINTSYM("\t", "scan_spare3", ss_ops->scan_spare3);
}
db_printf("\tss_flags %b", ss->ss_flags, IEEE80211_SS_FLAGS_BITS);
db_printf("\n");
db_printf("\tss_nssid %u", ss->ss_nssid);
for (i = 0; i < ss->ss_nssid && i < IEEE80211_SCAN_MAX_SSID; i++)
_db_show_ssid(" ss_nssid[%d]", i,
ss->ss_ssid[i].len, ss->ss_ssid[i].ssid);
db_printf("\n");
db_printf("\tss_chans:\n");
for (i = 0; i < ss->ss_last && i < IEEE80211_SCAN_MAX; i++) {
db_printf("\t%-3d", i);
_db_show_channel(" ", ss->ss_chans[i]);
db_printf("\n");
}
db_printf("\tss_next %u ss_last %u ss_mindwell %lu ss_maxdwell %lu",
ss->ss_next, ss->ss_last, ss->ss_mindwell, ss->ss_maxdwell);
db_printf("\n");
}
static void
_db_show_vap(const struct ieee80211vap *vap, int showmesh, int showprocs)
{
@ -532,7 +590,7 @@ _db_show_vap(const struct ieee80211vap *vap, int showmesh, int showprocs)
static void
_db_show_com(const struct ieee80211com *ic, int showvaps, int showsta,
int showmesh, int showprocs)
int showmesh, int showprocs, int showscan)
{
struct ieee80211vap *vap;
@ -679,6 +737,10 @@ _db_show_com(const struct ieee80211com *ic, int showvaps, int showsta,
DB_PRINTSYM("\t", "ic_addba_response", ic->ic_addba_response);
DB_PRINTSYM("\t", "ic_addba_stop", ic->ic_addba_stop);
}
if (showscan) {
db_printf("\n");
_db_show_scan(ic->ic_scan, showprocs);
}
if (showvaps && !TAILQ_EMPTY(&ic->ic_vaps)) {
db_printf("\n");
TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
@ -707,7 +769,7 @@ _db_show_all_vaps(void *arg, struct ieee80211com *ic)
db_printf(" %s(%p)", if_name(vap->iv_ifp), vap);
db_printf("\n");
} else
_db_show_com(ic, 1, 1, 1, 1);
_db_show_com(ic, 1, 1, 1, 1, 1);
}
static void

6
sys/net80211/ieee80211_ioctl.c
View File

@ -2590,8 +2590,10 @@ ieee80211_scanreq(struct ieee80211vap *vap, struct ieee80211_scan_req *sr)
sr->sr_flags |= IEEE80211_IOC_SCAN_NOPICK;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
"%s: flags 0x%x%s duration 0x%x mindwell %u maxdwell %u nssid %d\n",
__func__, sr->sr_flags,
"%s: vap %p iv_state %#x (%s) flags 0x%x%s "
"duration 0x%x mindwell %u maxdwell %u nssid %d\n",
__func__, vap, vap->iv_state, ieee80211_state_name[vap->iv_state],
sr->sr_flags,
(vap->iv_ifp->if_flags & IFF_UP) == 0 ? " (!IFF_UP)" : "",
sr->sr_duration, sr->sr_mindwell, sr->sr_maxdwell, sr->sr_nssid);
/*

6
sys/net80211/ieee80211_scan.h
View File

@ -147,6 +147,10 @@ struct ieee80211_scan_state {
unsigned long ss_maxdwell; /* max dwell on channel */
};
#define IEEE80211_SS_FLAGS_BITS \
"\20\1NOPICK\2ACTIVE\3PICK1ST\4BGSCAN\5ONCE\6NOBCAST\7NOJOIN" \
"\15GOTPICK"
/*
* The upper 16 bits of the flags word is used to communicate
* information to the scanning code that is NOT recorded in
@ -328,7 +332,7 @@ struct ieee80211_scanner {
void (*scan_spare0)(void);
void (*scan_spare1)(void);
void (*scan_spare2)(void);
void (*scan_spare4)(void);
void (*scan_spare3)(void);
};
void ieee80211_scanner_register(enum ieee80211_opmode,
const struct ieee80211_scanner *);