wil6210: workaround for BACK establishment race

When establishing BACK, WMI may be handled earlier then Rx, in this case
late Rx will be mis-handled.

Detect early Rx and pass it to the stack, bypass reordering

Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/ath/wil6210/rx_reorder.c b/drivers/net/wireless/ath/wil6210/rx_reorder.c
index 20d65f2..5af8012 100644 (file)
--- a/drivers/net/wireless/ath/wil6210/rx_reorder.c
+++ b/drivers/net/wireless/ath/wil6210/rx_reorder.c
@@ -127,13 +127,24 @@ void wil_rx_reorder(struct wil6210_priv *wil, struct sk_buff *skb)
         * reported, and data Rx, few packets may be pass up before reorder
         * buffer get allocated. Catch up by pretending SSN is what we
         * see in the 1-st Rx packet
+        *
+        * Another scenario, Rx get delayed and we got packet from before
+        * BACK. Pass it to the stack and wait.
         */
        if (r->first_time) {
                r->first_time = false;
                if (seq != r->head_seq_num) {
-                       wil_err(wil, "Error: 1-st frame with wrong sequence"
-                               " %d, should be %d. Fixing...\n", seq,
-                               r->head_seq_num);
+                       if (seq_less(seq, r->head_seq_num)) {
+                               wil_err(wil,
+                                       "Error: frame with early sequence 0x%03x, should be 0x%03x. Waiting...\n",
+                                       seq, r->head_seq_num);
+                               r->first_time = true;
+                               wil_netif_rx_any(skb, ndev);
+                               goto out;
+                       }
+                       wil_err(wil,
+                               "Error: 1-st frame with wrong sequence 0x%03x, should be 0x%03x. Fixing...\n",
+                               seq, r->head_seq_num);
                        r->head_seq_num = seq;
                        r->ssn = seq;
                }
@@ -279,6 +290,7 @@ static void wil_back_rx_handle(struct wil6210_priv *wil,
        int ba_policy = req->ba_param_set & BIT(1);
        u16 agg_timeout = req->ba_timeout;
        u16 status = WLAN_STATUS_SUCCESS;
+       u16 ssn = req->ba_seq_ctrl >> 4;
        unsigned long flags;
        int rc;
 
@@ -297,9 +309,9 @@ static void wil_back_rx_handle(struct wil6210_priv *wil,
        }
 
        wil_dbg_wmi(wil,
-                   "ADDBA request for CID %d %pM TID %d size %d timeout %d AMSDU%s policy %d token %d\n",
+                   "ADDBA request for CID %d %pM TID %d size %d timeout %d AMSDU%s policy %d token %d SSN 0x%03x\n",
                    cid, sta->addr, tid, req_agg_wsize, req->ba_timeout,
-                   agg_amsdu ? "+" : "-", !!ba_policy, req->dialog_token);
+                   agg_amsdu ? "+" : "-", !!ba_policy, req->dialog_token, ssn);
 
        /* apply policies */
        if (ba_policy) {
@@ -318,8 +330,7 @@ static void wil_back_rx_handle(struct wil6210_priv *wil,
        spin_lock_irqsave(&sta->tid_rx_lock, flags);
 
        wil_tid_ampdu_rx_free(wil, sta->tid_rx[tid]);
-       sta->tid_rx[tid] = wil_tid_ampdu_rx_alloc(wil, agg_wsize,
-                                                 req->ba_seq_ctrl >> 4);
+       sta->tid_rx[tid] = wil_tid_ampdu_rx_alloc(wil, agg_wsize, ssn);
 
        spin_unlock_irqrestore(&sta->tid_rx_lock, flags);
 }