netdev - [net-next 07/10] ixgbe: Fix handling of macvlan Tx offload

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Message-Id: <20180112172932.46683-8-jeffrey.t.kirsher@intel.com>
Date:   Fri, 12 Jan 2018 09:29:29 -0800
From:   Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:     davem@...emloft.net
Cc:     Alexander Duyck <alexander.h.duyck@...el.com>,
        netdev@...r.kernel.org, nhorman@...hat.com, sassmann@...hat.com,
        jogreene@...hat.com, Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 07/10] ixgbe: Fix handling of macvlan Tx offload

From: Alexander Duyck <alexander.h.duyck@...el.com>

This update makes it so that we report the actual number of Tx queues via
real_num_tx_queues but are still restricted to RSS on only the first pool
by setting num_tc equal to 1. Doing this locks us into only having the
ability to setup XPS on the queues in that pool, and only those queues
should be used for transmitting anything other than macvlan traffic.

Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c  |  4 ++++
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 20 ++++++++++----------
 2 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c
index cfe5a6af04d0..b3c282d09b18 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c
@@ -619,6 +619,10 @@ static bool ixgbe_set_sriov_queues(struct ixgbe_adapter *adapter)
 	}
 
 #endif
+	/* populate TC0 for use by pool 0 */
+	netdev_set_tc_queue(adapter->netdev, 0,
+			    adapter->num_rx_queues_per_pool, 0);
+
 	return true;
 }
 
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index cdb8502ae473..d8c4c1b90378 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -6571,20 +6571,12 @@ int ixgbe_open(struct net_device *netdev)
 		goto err_req_irq;
 
 	/* Notify the stack of the actual queue counts. */
-	if (adapter->num_rx_pools > 1)
-		queues = adapter->num_rx_queues_per_pool;
-	else
-		queues = adapter->num_tx_queues;
-
+	queues = adapter->num_tx_queues;
 	err = netif_set_real_num_tx_queues(netdev, queues);
 	if (err)
 		goto err_set_queues;
 
-	if (adapter->num_rx_pools > 1 &&
-	    adapter->num_rx_queues > IXGBE_MAX_L2A_QUEUES)
-		queues = IXGBE_MAX_L2A_QUEUES;
-	else
-		queues = adapter->num_rx_queues;
+	queues = adapter->num_rx_queues;
 	err = netif_set_real_num_rx_queues(netdev, queues);
 	if (err)
 		goto err_set_queues;
@@ -8814,6 +8806,14 @@ int ixgbe_setup_tc(struct net_device *dev, u8 tc)
 	} else {
 		netdev_reset_tc(dev);
 
+		/* To support macvlan offload we have to use num_tc to
+		 * restrict the queues that can be used by the device.
+		 * By doing this we can avoid reporting a false number of
+		 * queues.
+		 */
+		if (!tc && adapter->num_rx_pools > 1)
+			netdev_set_num_tc(dev, 1);
+
 		if (adapter->hw.mac.type == ixgbe_mac_82598EB)
 			adapter->hw.fc.requested_mode = adapter->last_lfc_mode;
 
-- 
2.15.1