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nl80211: Reduce the number of nlctrl name resolution calls

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The number of nlctrl name resolution calls required to connect to a
WPA2-PSK AP is 12. And each nlctrl name resolution call spends 55 micro
seconds on a lower spec CPU like Intel Atom N270. Reduce the number of
nctrl name resolution calls from 12 to 1 by caching the results of nctrl
name resolution calls on int size memory to speed up the connection
process a little bit.

Signed-off-by: Masashi Honma <masashi.honma@gmail.com>
This commit is contained in:
Masashi Honma 2021-08-20 18:26:33 +09:00 committed by Jouni Malinen
parent 2bbc5a2b09
commit 4c80937c7f
2 changed files with 9 additions and 1 deletions
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9
src/drivers/driver_nl80211.c
View file

@ -604,7 +604,7 @@ static int nl_get_multicast_id(struct nl80211_global *global,
msg = nlmsg_alloc(); msg = nlmsg_alloc();
if (!msg) if (!msg)
return -ENOMEM; return -ENOMEM;
if (!genlmsg_put(msg, 0, 0, genl_ctrl_resolve(global->nl, "nlctrl"), if (!genlmsg_put(msg, 0, 0, global->nlctrl_id,
0, 0, CTRL_CMD_GETFAMILY, 0) || 0, 0, CTRL_CMD_GETFAMILY, 0) ||
nla_put_string(msg, CTRL_ATTR_FAMILY_NAME, family)) { nla_put_string(msg, CTRL_ATTR_FAMILY_NAME, family)) {
nlmsg_free(msg); nlmsg_free(msg);
@ -1883,6 +1883,13 @@ static int wpa_driver_nl80211_init_nl_global(struct nl80211_global *global)
goto err; goto err;
} }
global->nlctrl_id = genl_ctrl_resolve(global->nl, "nlctrl");
if (global->nlctrl_id < 0) {
wpa_printf(MSG_ERROR,
"nl80211: 'nlctrl' generic netlink not found");
goto err;
}
global->nl_event = nl_create_handle(global->nl_cb, "event"); global->nl_event = nl_create_handle(global->nl_cb, "event");
if (global->nl_event == NULL) if (global->nl_event == NULL)
goto err; goto err;

1
src/drivers/driver_nl80211.h
View file

@ -32,6 +32,7 @@ struct nl80211_global {
struct nl_cb *nl_cb; struct nl_cb *nl_cb;
struct nl_sock *nl; struct nl_sock *nl;
int nl80211_id; int nl80211_id;
int nlctrl_id;
int ioctl_sock; /* socket for ioctl() use */ int ioctl_sock; /* socket for ioctl() use */
struct nl_sock *nl_event; struct nl_sock *nl_event;