cfg80211: Separate available antennas for RX and TX

As has been pointed out by Daniel Halperin some devices (e.g. Intel IWL5100)
can only TX from a subset of RX antennas, so use separate availability masks
for RX and TX.

Signed-off-by: Bruno Randolf <br1@einfach.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 924d603..bcc9f44 100644 (file)
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1482,8 +1482,13 @@ struct ieee80211_txrx_stypes {
  *     transmitted through nl80211, points to an array indexed by interface
  *     type
  *
- * @available_antennas: bitmap of antennas which are available to configure.
- *     antenna configuration commands will be rejected unless this is set.
+ * @available_antennas_tx: bitmap of antennas which are available to be
+ *     configured as TX antennas. Antenna configuration commands will be
+ *     rejected unless this or @available_antennas_rx is set.
+ *
+ * @available_antennas_rx: bitmap of antennas which are available to be
+ *     configured as RX antennas. Antenna configuration commands will be
+ *     rejected unless this or @available_antennas_tx is set.
  *
  * @max_remain_on_channel_duration: Maximum time a remain-on-channel operation
  *     may request, if implemented.
@@ -1528,7 +1533,8 @@ struct wiphy {
 
        u8 max_num_pmkids;
 
-       u32 available_antennas;
+       u32 available_antennas_tx;
+       u32 available_antennas_rx;
 
        /* If multiple wiphys are registered and you're handed e.g.
         * a regular netdev with assigned ieee80211_ptr, you won't

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 6a5d6fa..8d2f5f8 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -605,7 +605,8 @@ static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags,
        if (dev->wiphy.flags & WIPHY_FLAG_CONTROL_PORT_PROTOCOL)
                NLA_PUT_FLAG(msg, NL80211_ATTR_CONTROL_PORT_ETHERTYPE);
 
-       if (dev->wiphy.available_antennas && dev->ops->get_antenna) {
+       if ((dev->wiphy.available_antennas_tx ||
+            dev->wiphy.available_antennas_rx) && dev->ops->get_antenna) {
                u32 tx_ant = 0, rx_ant = 0;
                int res;
                res = dev->ops->get_antenna(&dev->wiphy, &tx_ant, &rx_ant);
@@ -1107,7 +1108,9 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
        if (info->attrs[NL80211_ATTR_WIPHY_ANTENNA_TX] &&
            info->attrs[NL80211_ATTR_WIPHY_ANTENNA_RX]) {
                u32 tx_ant, rx_ant;
-               if (!rdev->wiphy.available_antennas || !rdev->ops->set_antenna) {
+               if ((!rdev->wiphy.available_antennas_tx &&
+                    !rdev->wiphy.available_antennas_rx) ||
+                   !rdev->ops->set_antenna) {
                        result = -EOPNOTSUPP;
                        goto bad_res;
                }
@@ -1116,15 +1119,15 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
                rx_ant = nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_ANTENNA_RX]);
 
                /* reject antenna configurations which don't match the
-                * available antenna mask, except for the "all" mask */
-               if ((~tx_ant && (tx_ant & ~rdev->wiphy.available_antennas)) ||
-                   (~rx_ant && (rx_ant & ~rdev->wiphy.available_antennas))) {
+                * available antenna masks, except for the "all" mask */
+               if ((~tx_ant && (tx_ant & ~rdev->wiphy.available_antennas_tx)) ||
+                   (~rx_ant && (rx_ant & ~rdev->wiphy.available_antennas_rx))) {
                        result = -EINVAL;
                        goto bad_res;
                }
 
-               tx_ant = tx_ant & rdev->wiphy.available_antennas;
-               rx_ant = rx_ant & rdev->wiphy.available_antennas;
+               tx_ant = tx_ant & rdev->wiphy.available_antennas_tx;
+               rx_ant = rx_ant & rdev->wiphy.available_antennas_rx;
 
                result = rdev->ops->set_antenna(&rdev->wiphy, tx_ant, rx_ant);
                if (result)