iwlwifi: mvm: allow same PN for de-aggregated AMSDU

The 9000 hardware will de-aggregate AMSDUs. In the process
it will copy the mac header "as is" to the new MPDUs.
This means driver should allow the same PN for MPDUs originated
from the same AMSDU.
Do that by incrementing the PN only for the last MPDU in the
sequence.
Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c

@@ -132,6 +132,7 @@ static inline int iwl_mvm_check_pn(struct iwl_mvm *mvm, struct sk_buff *skb,
 		   IEEE80211_CCMP_PN_LEN) <= 0)
 		return -1;
 
+	if (!(stats->flag & RX_FLAG_AMSDU_MORE))
 		memcpy(ptk_pn->q[queue].pn[tid], pn, IEEE80211_CCMP_PN_LEN);
 	stats->flag |= RX_FLAG_PN_VALIDATED;
 
@@ -883,6 +884,9 @@ void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi,
 			u8 *qc = ieee80211_get_qos_ctl(hdr);
 
 			*qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT;
+			if (!(desc->amsdu_info &
+			      IWL_RX_MPDU_AMSDU_LAST_SUBFRAME))
+				rx_status->flag |= RX_FLAG_AMSDU_MORE;
 		}
 		if (baid != IWL_RX_REORDER_DATA_INVALID_BAID)
 			iwl_mvm_agg_rx_received(mvm, baid);