ixgbe: fix build err, num_rx_queues is only available with CONFIG_RPS

In the recent support for layer 2 hardware acceleration, I added a
few references to real_num_rx_queues and num_rx_queues which are
only available with CONFIG_RPS.

The fix is first to remove unnecessary references to num_rx_queues.
Because the hardware offload case is limited to cases where RX queues
and TX queues are equal we only need a single check. Then wrap the
single case in an ifdef.

The patch that introduce this is here,

commit a6cc0cfa72e0b6d9f2c8fd858aacc32313c4f272
Author: John Fastabend <john.r.fastabend@intel.com>
Date:   Wed Nov 6 09:54:46 2013 -0800

    net: Add layer 2 hardware acceleration operations for macvlan devices

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Acked-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 607275d..2e17c30 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -4164,7 +4164,7 @@ static void ixgbe_add_mac_filter(struct ixgbe_adapter *adapter,
 static void ixgbe_fwd_psrtype(struct ixgbe_fwd_adapter *vadapter)
 {
        struct ixgbe_adapter *adapter = vadapter->real_adapter;
-       int rss_i = vadapter->netdev->real_num_rx_queues;
+       int rss_i = adapter->num_rx_queues_per_pool;
        struct ixgbe_hw *hw = &adapter->hw;
        u16 pool = vadapter->pool;
        u32 psrtype = IXGBE_PSRTYPE_TCPHDR |
@@ -4315,8 +4315,6 @@ static int ixgbe_fwd_ring_up(struct net_device *vdev,
        if (err)
                goto fwd_queue_err;
 
-       queues = min_t(unsigned int,
-                      adapter->num_rx_queues_per_pool, vdev->num_rx_queues);
        err = netif_set_real_num_rx_queues(vdev, queues);
        if (err)
                goto fwd_queue_err;
@@ -7540,9 +7538,15 @@ static void *ixgbe_fwd_add(struct net_device *pdev, struct net_device *vdev)
        struct ixgbe_adapter *adapter = netdev_priv(pdev);
        int pool, err;
 
+#ifdef CONFIG_RPS
+       if (vdev->num_rx_queues != vdev->num_tx_queues) {
+               netdev_info(pdev, "%s: Only supports a single queue count for TX and RX\n",
+                           vdev->name);
+               return ERR_PTR(-EINVAL);
+       }
+#endif
        /* Check for hardware restriction on number of rx/tx queues */
-       if (vdev->num_rx_queues != vdev->num_tx_queues ||
-           vdev->num_tx_queues > IXGBE_MAX_L2A_QUEUES ||
+       if (vdev->num_tx_queues > IXGBE_MAX_L2A_QUEUES ||
            vdev->num_tx_queues == IXGBE_BAD_L2A_QUEUE) {
                netdev_info(pdev,
                            "%s: Supports RX/TX Queue counts 1,2, and 4\n",
@@ -7566,7 +7570,7 @@ static void *ixgbe_fwd_add(struct net_device *pdev, struct net_device *vdev)
        /* Enable VMDq flag so device will be set in VM mode */
        adapter->flags |= IXGBE_FLAG_VMDQ_ENABLED | IXGBE_FLAG_SRIOV_ENABLED;
        adapter->ring_feature[RING_F_VMDQ].limit = adapter->num_rx_pools;
-       adapter->ring_feature[RING_F_RSS].limit = vdev->num_rx_queues;
+       adapter->ring_feature[RING_F_RSS].limit = vdev->num_tx_queues;
 
        /* Force reinit of ring allocation with VMDQ enabled */
        err = ixgbe_setup_tc(pdev, netdev_get_num_tc(pdev));