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| author | Simon Wunderlich <simon.wunderlich@s2003.tu-chemnitz.de> | 2012-01-28 17:25:32 +0100 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2012-01-30 15:48:25 -0500 |
| commit | 24db78c05b1e3ccb5a78aedd17aa1008c91dab5a (patch) | |
| tree | f41babc8ada871a26619be23f983121ad557da91 /net/wireless | |
| parent | d273bb20c00340748e3ca9730f87524ec5abbd64 (diff) | |
| download | linux-stable-24db78c05b1e3ccb5a78aedd17aa1008c91dab5a.tar.gz linux-stable-24db78c05b1e3ccb5a78aedd17aa1008c91dab5a.tar.bz2 linux-stable-24db78c05b1e3ccb5a78aedd17aa1008c91dab5a.zip | |
nl80211: add support for mcs masks
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 <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/wireless')
| -rw-r--r-- | net/wireless/nl80211.c | 61 |
1 files changed, 60 insertions, 1 deletions
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index c42173f947ef..c910b0750dc2 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -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; } } |