From: Radoslaw Tyl <radoslawx.tyl@intel.com>
Date: Wed, 5 Sep 2018 07:00:51 +0000 (+0200)
Subject: ixgbe: Fix ixgbe TX hangs with XDP_TX beyond queue limit
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=8d7179b1e2d64b3493c0114916486fe92e6109a9;p=openwrt%2Fstaging%2Fblogic.git

ixgbe: Fix ixgbe TX hangs with XDP_TX beyond queue limit

We have Tx hang when number Tx and XDP queues are more than 64.
In XDP always is MTQC == 0x0 (64TxQs). We need more space for Tx queues.

Signed-off-by: Radoslaw Tyl <radoslawx.tyl@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 140e87a10ff5..ddc22557155b 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -3577,12 +3577,18 @@ static void ixgbe_setup_mtqc(struct ixgbe_adapter *adapter)
 		else
 			mtqc |= IXGBE_MTQC_64VF;
 	} else {
-		if (tcs > 4)
+		if (tcs > 4) {
 			mtqc = IXGBE_MTQC_RT_ENA | IXGBE_MTQC_8TC_8TQ;
-		else if (tcs > 1)
+		} else if (tcs > 1) {
 			mtqc = IXGBE_MTQC_RT_ENA | IXGBE_MTQC_4TC_4TQ;
-		else
-			mtqc = IXGBE_MTQC_64Q_1PB;
+		} else {
+			u8 max_txq = adapter->num_tx_queues +
+				adapter->num_xdp_queues;
+			if (max_txq > 63)
+				mtqc = IXGBE_MTQC_RT_ENA | IXGBE_MTQC_4TC_4TQ;
+			else
+				mtqc = IXGBE_MTQC_64Q_1PB;
+		}
 	}
 
 	IXGBE_WRITE_REG(hw, IXGBE_MTQC, mtqc);