cfg80211/nl80211: Indicate roaming feature capability to userspace.

When the rssi of the current AP drops, both wpa_supplicant and the
firmware may do a background scan to find a better AP and try to
associate. Since firmware based roaming is faster, inform
wpa_supplicant to avoid roaming and let the firmware decide to
roam if necessary.

For fullmac drivers like ath6kl, it is just enough to provide the
ESSID and the firmware will decide on the BSSID. Since it is not
possible to do pre-auth during roaming for fullmac drivers, the
wpa_supplicant needs to completely disconnect with the old AP and
reconnect with the new AP. This consumes lot of time and it is
better to leave the roaming decision to the firmware.

Signed-off-by: Vivek Natarajan <nataraja@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index bddb5595c659..ad13903c9b89 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -189,6 +189,7 @@ static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = {
                                          .len = IEEE80211_MAX_DATA_LEN },
         [NL80211_ATTR_IE_ASSOC_RESP] = { .type = NLA_BINARY,
                                          .len = IEEE80211_MAX_DATA_LEN },
+        [NL80211_ATTR_ROAM_SUPPORT] = { .type = NLA_FLAG },
 };
 
 /* policy for the key attributes */
@@ -720,6 +721,9 @@ static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags,
         if (dev->wiphy.flags & WIPHY_FLAG_MESH_AUTH)
                 NLA_PUT_FLAG(msg, NL80211_ATTR_SUPPORT_MESH_AUTH);
 
+        if (dev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM)
+                NLA_PUT_FLAG(msg, NL80211_ATTR_ROAM_SUPPORT);
+
         NLA_PUT(msg, NL80211_ATTR_CIPHER_SUITES,
                 sizeof(u32) * dev->wiphy.n_cipher_suites,
                 dev->wiphy.cipher_suites);