iwlwifi: mvm: Allow retries for probe responses

When hostapd sends a probe response, it does not request an
acknowledgment on the probe response. This setting is propagated
to the driver and FW from mac80211, and as a result probe responses
are transmitted only once without retries. In congested
environments, this reduces the likelihood for finding the AP.

To overcome this, enable acknowledgment and retries for probe
responses, even in case no acknowledgment is requested. In such
a case the retry limit is set to 3.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/tx.c b/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
index b82b2f062c95d244424391a09336a95da2f0fc80..d01998853d1f785e28a0a1a2f02bbaed0ad37d56 100644 (file)
--- a/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
@@ -209,7 +209,9 @@ void iwl_mvm_set_tx_cmd(struct iwl_mvm *mvm, struct sk_buff *skb,
        u16 offload_assist = 0;
        u8 ac;
 
-       if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
+       if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) ||
+           (ieee80211_is_probe_resp(fc) &&
+            !is_multicast_ether_addr(hdr->addr1)))
                tx_flags |= TX_CMD_FLG_ACK;
        else
                tx_flags &= ~TX_CMD_FLG_ACK;