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nl80211: add support for mcs masks

Browse source 
Allow to set mcs masks through nl80211. We also allow to set MCS
rates but no legacy rates (and vice versa).

Signed-off-by: Simon Wunderlich <[email protected]>
Signed-off-by: Mathias Kretschmer <[email protected]>
Signed-off-by: John W. Linville <[email protected]>
This commit is contained in:
Simon Wunderlich 2012-01-28 17:25:32 +01:00 • committed by John W. Linville
commit 24db78c05b
3 changed files with 65 additions and 3 deletions
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61
net/wireless/nl80211.c
View file

@ -5393,9 +5393,39 @@ static u32 rateset_to_mask(struct ieee80211_supported_band *sband,
return mask;
}
static bool ht_rateset_to_mask(struct ieee80211_supported_band *sband,
u8 *rates, u8 rates_len,
u8 mcs[IEEE80211_HT_MCS_MASK_LEN])
{
u8 i;
memset(mcs, 0, IEEE80211_HT_MCS_MASK_LEN);
for (i = 0; i < rates_len; i++) {
int ridx, rbit;
ridx = rates[i] / 8;
rbit = BIT(rates[i] % 8);
/* check validity */
if ((ridx < 0) || (ridx > IEEE80211_HT_MCS_MASK_LEN))
return false;
/* check availability */
if (sband->ht_cap.mcs.rx_mask[ridx] & rbit)
mcs[ridx] |= rbit;
else
return false;
}
return true;
}
static const struct nla_policy nl80211_txattr_policy[NL80211_TXRATE_MAX + 1] = {
[NL80211_TXRATE_LEGACY] = { .type = NLA_BINARY,
.len = NL80211_MAX_SUPP_RATES },
[NL80211_TXRATE_MCS] = { .type = NLA_BINARY,
.len = NL80211_MAX_SUPP_HT_RATES },
};
static int nl80211_set_tx_bitrate_mask(struct sk_buff *skb,
@ -5421,12 +5451,20 @@ static int nl80211_set_tx_bitrate_mask(struct sk_buff *skb,
sband = rdev->wiphy.bands[i];
mask.control[i].legacy =
sband ? (1 << sband->n_bitrates) - 1 : 0;
if (sband)
memcpy(mask.control[i].mcs,
sband->ht_cap.mcs.rx_mask,
sizeof(mask.control[i].mcs));
else
memset(mask.control[i].mcs, 0,
sizeof(mask.control[i].mcs));
}
/*
* The nested attribute uses enum nl80211_band as the index. This maps
* directly to the enum ieee80211_band values used in cfg80211.
*/
BUILD_BUG_ON(NL80211_MAX_SUPP_HT_RATES > IEEE80211_HT_MCS_MASK_LEN * 8);
nla_for_each_nested(tx_rates, info->attrs[NL80211_ATTR_TX_RATES], rem)
{
enum ieee80211_band band = nla_type(tx_rates);
@ -5442,7 +5480,28 @@ static int nl80211_set_tx_bitrate_mask(struct sk_buff *skb,
sband,
nla_data(tb[NL80211_TXRATE_LEGACY]),
nla_len(tb[NL80211_TXRATE_LEGACY]));
if (mask.control[band].legacy == 0)
}
if (tb[NL80211_TXRATE_MCS]) {
if (!ht_rateset_to_mask(
sband,
nla_data(tb[NL80211_TXRATE_MCS]),
nla_len(tb[NL80211_TXRATE_MCS]),
mask.control[band].mcs))
return -EINVAL;
}
if (mask.control[band].legacy == 0) {
/* don't allow empty legacy rates if HT
* is not even supported. */
if (!rdev->wiphy.bands[band]->ht_cap.ht_supported)
return -EINVAL;
for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++)
if (mask.control[band].mcs[i])
break;
/* legacy and mcs rates may not be both empty */
if (i == IEEE80211_HT_MCS_MASK_LEN)
return -EINVAL;
}
}