I tried to add use the nl80211.h userspace API to configure the txq
parameters via the 'iw' utility. From my understanding (and after
staring at the nl80211.h) I have to send nested netlink
messages. I added the following to 'phy.c' in the iw-3.15 source files
to extend iw with the command 'iw <phy_dev> set txq <cwmin> <cwmax>'
but somehow I always get a 'command failed: Invalid argument (-22)'
returned. I tried this with two different drivers/physical devices
(intel's iwlwifi and realtek's rtl8192cu) and had no luck (same
error). Do I use this wrong?
>From my understanding this should work driver independently since
mac80211 is shared and work at least for iwlwifi. Thanks for any help!
static int handle_txq(struct nl80211_state *state,
struct nl_cb *cb,
struct nl_msg *msg,
int argc, char **argv,
enum id_input id)
{
unsigned int cw_min, cw_max;
printf("HANDLE TXQ");
if (argc != 2)
return 1;
cw_min = atoi(argv[0]);
cw_max = atoi(argv[1]);
printf("setting contention window to: %d - %d\n",cw_min,cw_max);
//create nested txq array
struct nlattr *nested;
nested = nla_nest_start(msg,NL80211_ATTR_WIPHY_TXQ_PARAMS);
NLA_PUT_U16(msg,NL80211_TXQ_ATTR_CWMIN,cw_min);
NLA_PUT_U16(msg,NL80211_TXQ_ATTR_CWMAX,cw_max);
nla_nest_end(msg,nested);
return 0;
nla_put_failure:
return -ENOBUFS;
}
COMMAND(set, txq, "<cw_min> <cw_max>",
NL80211_CMD_SET_WIPHY, 0, CIB_NETDEV, handle_txq,
"Set contention window minimum and maximum size.\n"
"Valid values: 1 - 32767 in the form 2^n-1");
COMMAND(set, txq, "<cw_min> <cw_max>",
NL80211_CMD_SET_WIPHY, 0, CIB_PHY, handle_txq,
"Set contention window minimum and maximum size.\n"
"Valid values: 1 - 32767 in the form 2^n-1");
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