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nl80211: Separate channel noise fetch from scan result processing

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This untangles the NL80211_CMD_GET_SURVEY handler loop from
NL80211_CMD_GET_SCAN processing so that the per-channel noise
information can be fetched with a common function to a local data
structure that can then be easily used to update individual scan results
(a single BSS) instead of having to go through a full set of scan
results. This is a step towards optimizing scan result fetching without
having to allocate memory for all entries at the same time.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Jouni Malinen 2016-12-02 20:48:43 +02:00 committed by Jouni Malinen
parent f0b6d1edfb
commit e35e137298
1 changed files with 44 additions and 21 deletions
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65
src/drivers/driver_nl80211_scan.c
View file

@ -20,6 +20,14 @@
#include "driver_nl80211.h"
#define MAX_NL80211_NOISE_FREQS 50
struct nl80211_noise_info {
u32 freq[MAX_NL80211_NOISE_FREQS];
s8 noise[MAX_NL80211_NOISE_FREQS];
unsigned int count;
};
static int get_noise_for_scan_results(struct nl_msg *msg, void *arg)
{
struct nlattr *tb[NL80211_ATTR_MAX + 1];
@ -29,9 +37,10 @@ static int get_noise_for_scan_results(struct nl_msg *msg, void *arg)
[NL80211_SURVEY_INFO_FREQUENCY] = { .type = NLA_U32 },
[NL80211_SURVEY_INFO_NOISE] = { .type = NLA_U8 },
};
struct wpa_scan_results *scan_results = arg;
struct wpa_scan_res *scan_res;
size_t i;
struct nl80211_noise_info *info = arg;
if (info->count >= MAX_NL80211_NOISE_FREQS)
return NL_STOP;
nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
genlmsg_attrlen(gnlh, 0), NULL);
@ -55,33 +64,24 @@ static int get_noise_for_scan_results(struct nl_msg *msg, void *arg)
if (!sinfo[NL80211_SURVEY_INFO_FREQUENCY])
return NL_SKIP;
for (i = 0; i < scan_results->num; ++i) {
scan_res = scan_results->res[i];
if (!scan_res)
continue;
if ((int) nla_get_u32(sinfo[NL80211_SURVEY_INFO_FREQUENCY]) !=
scan_res->freq)
continue;
if (!(scan_res->flags & WPA_SCAN_NOISE_INVALID))
continue;
scan_res->noise = (s8)
nla_get_u8(sinfo[NL80211_SURVEY_INFO_NOISE]);
scan_res->flags &= ~WPA_SCAN_NOISE_INVALID;
}
info->freq[info->count] =
nla_get_u32(sinfo[NL80211_SURVEY_INFO_FREQUENCY]);
info->noise[info->count] =
(s8) nla_get_u8(sinfo[NL80211_SURVEY_INFO_NOISE]);
info->count++;
return NL_SKIP;
}
static int nl80211_get_noise_for_scan_results(
struct wpa_driver_nl80211_data *drv,
struct wpa_scan_results *scan_res)
struct wpa_driver_nl80211_data *drv, struct nl80211_noise_info *info)
{
struct nl_msg *msg;
os_memset(info, 0, sizeof(*info));
msg = nl80211_drv_msg(drv, NLM_F_DUMP, NL80211_CMD_GET_SURVEY);
return send_and_recv_msgs(drv, msg, get_noise_for_scan_results,
scan_res);
return send_and_recv_msgs(drv, msg, get_noise_for_scan_results, info);
}
@ -853,6 +853,21 @@ static void wpa_driver_nl80211_check_bss_status(
}
static void nl80211_update_scan_res_noise(struct wpa_scan_res *res,
struct nl80211_noise_info *info)
{
unsigned int i;
for (i = 0; res && i < info->count; i++) {
if ((int) info->freq[i] != res->freq ||
!(res->flags & WPA_SCAN_NOISE_INVALID))
continue;
res->noise = info->noise[i];
res->flags &= ~WPA_SCAN_NOISE_INVALID;
}
}
static struct wpa_scan_results *
nl80211_get_scan_results(struct wpa_driver_nl80211_data *drv)
{
@ -874,9 +889,17 @@ nl80211_get_scan_results(struct wpa_driver_nl80211_data *drv)
arg.res = res;
ret = send_and_recv_msgs(drv, msg, bss_info_handler, &arg);
if (ret == 0) {
struct nl80211_noise_info info;
wpa_printf(MSG_DEBUG, "nl80211: Received scan results (%lu "
"BSSes)", (unsigned long) res->num);
nl80211_get_noise_for_scan_results(drv, res);
if (nl80211_get_noise_for_scan_results(drv, &info) == 0) {
size_t i;
for (i = 0; i < res->num; ++i)
nl80211_update_scan_res_noise(res->res[i],
&info);
}
return res;
}
wpa_printf(MSG_DEBUG, "nl80211: Scan result fetch failed: ret=%d "