iwlwifi: mvm: do not trust NSSN for amsdu sub-frames

We cannot trust NSSN for AMSDU sub-frames that are not the
last.
The reason is that NSSN advances on the first sub-frame,
and may cause the reorder buffer to advance before all the
sub-frames arrive.
Example:
Reorder buffer contains SN 0 & 2.
We receive AMSDU with SN 1 and NSSN for first sub frame 3.
The result us that driver releases SN 0,1, 2.
When sub-frame 1 arrives - reorder buffer is already ahead and
it will be dropped.
If the last sub-frame is not on this queue - we will get frame
release notification with up to date NSSN.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
index ac2c571..0f26c70 100644 (file)
--- a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
@@ -587,6 +587,8 @@ static bool iwl_mvm_reorder(struct iwl_mvm *mvm,
        struct sk_buff *tail;
        u32 reorder = le32_to_cpu(desc->reorder_data);
        bool amsdu = desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU;
+       bool last_subframe =
+               desc->amsdu_info & IWL_RX_MPDU_AMSDU_LAST_SUBFRAME;
        u8 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
        u8 sub_frame_idx = desc->amsdu_info &
                           IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK;
@@ -651,7 +653,8 @@ static bool iwl_mvm_reorder(struct iwl_mvm *mvm,
        /* release immediately if allowed by nssn and no stored frames */
        if (!buffer->num_stored && ieee80211_sn_less(sn, nssn)) {
                if (iwl_mvm_is_sn_less(buffer->head_sn, nssn,
-                                      buffer->buf_size))
+                                      buffer->buf_size) &&
+                  (!amsdu || last_subframe))
                        buffer->head_sn = nssn;
                /* No need to update AMSDU last SN - we are moving the head */
                spin_unlock_bh(&buffer->lock);
@@ -685,7 +688,20 @@ static bool iwl_mvm_reorder(struct iwl_mvm *mvm,
                buffer->last_sub_index = sub_frame_idx;
        }
 
-       iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn);
+       /*
+        * We cannot trust NSSN for AMSDU sub-frames that are not the last.
+        * The reason is that NSSN advances on the first sub-frame, and may
+        * cause the reorder buffer to advance before all the sub-frames arrive.
+        * Example: reorder buffer contains SN 0 & 2, and we receive AMSDU with
+        * SN 1. NSSN for first sub frame will be 3 with the result of driver
+        * releasing SN 0,1, 2. When sub-frame 1 arrives - reorder buffer is
+        * already ahead and it will be dropped.
+        * If the last sub-frame is not on this queue - we will get frame
+        * release notification with up to date NSSN.
+        */
+       if (!amsdu || last_subframe)
+               iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn);
+
        spin_unlock_bh(&buffer->lock);
        return true;