wil6210: more debug info for vring

print used/available counters on debugfs;
print to dmesg when Tx vring becomes empty

This aids with performance investigation
Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/wil6210/debugfs.c

@@ -72,11 +72,16 @@ static int wil_vring_debugfs_show(struct seq_file *s, void *data)
 		if (vring->va) {
 			int cid = wil->vring2cid_tid[i][0];
 			int tid = wil->vring2cid_tid[i][1];
+			u32 swhead = vring->swhead;
+			u32 swtail = vring->swtail;
+			int used = (vring->size + swhead - swtail)
+				   % vring->size;
+			int avail = vring->size - used - 1;
 			char name[10];
 			snprintf(name, sizeof(name), "tx_%2d", i);
 
-			seq_printf(s, "\n%pM CID %d TID %d\n",
-				   wil->sta[cid].addr, cid, tid);
+			seq_printf(s, "\n%pM CID %d TID %d [%3d|%3d]\n",
+				   wil->sta[cid].addr, cid, tid, used, avail);
 			wil_print_vring(s, wil, name, vring, '_', 'H');
 		}
 	}

drivers/net/wireless/ath/wil6210/txrx.c

@@ -1132,6 +1132,10 @@ int wil_tx_complete(struct wil6210_priv *wil, int ringid)
 			done++;
 		}
 	}
+
+	if (wil_vring_is_empty(vring))
+		wil_dbg_txrx(wil, "Ring[%2d] empty\n", ringid);
+
 	if (wil_vring_avail_tx(vring) > wil_vring_wmark_high(vring))
 		netif_tx_wake_all_queues(wil_to_ndev(wil));