ixgbe: Retire RSS enabled and capable flags

All of our hardware supports RSS even if it is only for a single queue. So
instead of toting around the RSS enable flag I am updating the code so that
all devices are enabled and if we want to disable RSS it is indicated via
the RSS mask.

Signed-off-by: Alexander Duyck <[e-mail]>
Tested-by: Phil Schmitt <[e-mail]>
Signed-off-by: Jeff Kirsher <[e-mail]>

drivers/net/ethernet/intel/ixgbe/ixgbe.h

···
 #define IXGBE_FLAG_IMIR_ENABLED                 (u32)(1 << 12)
 #define IXGBE_FLAG_MQ_CAPABLE                   (u32)(1 << 13)
 #define IXGBE_FLAG_DCB_ENABLED                  (u32)(1 << 14)
-#define IXGBE_FLAG_RSS_ENABLED                  (u32)(1 << 16)
-#define IXGBE_FLAG_RSS_CAPABLE                  (u32)(1 << 17)
 #define IXGBE_FLAG_VMDQ_CAPABLE                 (u32)(1 << 18)
 #define IXGBE_FLAG_VMDQ_ENABLED                 (u32)(1 << 19)
 #define IXGBE_FLAG_FAN_FAIL_CAPABLE             (u32)(1 << 20)

drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c

···
 {
 	cmd->data = 0;
 
-	/* if RSS is disabled then report no hashing */
-	if (!(adapter->flags & IXGBE_FLAG_RSS_ENABLED))
-		return 0;
-
 	/* Report default options for RSS on ixgbe */
 	switch (cmd->flow_type) {
 	case TCP_V4_FLOW:

drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c

···
 {
 	int i;
 
-	if (!(adapter->flags & IXGBE_FLAG_RSS_ENABLED))
-		return false;
-
 	for (i = 0; i < adapter->num_rx_queues; i++)
 		adapter->rx_ring[i]->reg_idx = i;
 	for (i = 0; i < adapter->num_tx_queues; i++)
···
 {
 	struct ixgbe_ring_feature *f;
 	u16 rss_i;
-
-	if (!(adapter->flags & IXGBE_FLAG_RSS_ENABLED)) {
-		adapter->flags &= ~IXGBE_FLAG_FDIR_HASH_CAPABLE;
-		return false;
-	}
 
 	/* set mask for 16 queue limit of RSS */
 	f = &adapter->ring_feature[RING_F_RSS];
···
 	}
 
 	adapter->flags &= ~IXGBE_FLAG_DCB_ENABLED;
-	adapter->flags &= ~IXGBE_FLAG_RSS_ENABLED;
 	if (adapter->flags & IXGBE_FLAG_FDIR_HASH_CAPABLE) {
 		e_err(probe,
 		      "ATR is not supported while multiple "
···
 	if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED)
 		ixgbe_disable_sriov(adapter);
 
+	adapter->ring_feature[RING_F_RSS].limit = 1;
 	ixgbe_set_num_queues(adapter);
 	adapter->num_q_vectors = 1;
 

drivers/net/ethernet/intel/ixgbe/ixgbe_main.c

···
 	int i, j;
 	u16 rss_i = adapter->ring_feature[RING_F_RSS].indices;
 
-	if (!(adapter->flags & IXGBE_FLAG_RSS_ENABLED))
-		rss_i = 1;
-
 	/*
 	 * Program table for at least 2 queues w/ SR-IOV so that VFs can
 	 * make full use of any rings they may have.  We will use the
···
 	IXGBE_WRITE_REG(hw, IXGBE_RXCSUM, rxcsum);
 
 	if (adapter->hw.mac.type == ixgbe_mac_82598EB) {
-		if (adapter->flags & IXGBE_FLAG_RSS_ENABLED)
+		if (adapter->ring_feature[RING_F_RSS].mask)
 			mrqc = IXGBE_MRQC_RSSEN;
 	} else {
 		u8 tcs = netdev_get_num_tc(adapter->netdev);
···
 static void ixgbe_setup_psrtype(struct ixgbe_adapter *adapter)
 {
 	struct ixgbe_hw *hw = &adapter->hw;
+	int rss_i = adapter->ring_feature[RING_F_RSS].indices;
 	int p;
 
 	/* PSRTYPE must be initialized in non 82598 adapters */
···
 	if (hw->mac.type == ixgbe_mac_82598EB)
 		return;
 
-	if (adapter->flags & IXGBE_FLAG_RSS_ENABLED) {
-		int rss_i = adapter->ring_feature[RING_F_RSS].indices;
-		if (rss_i > 3)
-			psrtype |= 2 << 29;
-		else if (rss_i > 1)
-			psrtype |= 1 << 29;
-	}
+	if (rss_i > 3)
+		psrtype |= 2 << 29;
+	else if (rss_i > 1)
+		psrtype |= 1 << 29;
 
 	for (p = 0; p < adapter->num_rx_pools; p++)
 		IXGBE_WRITE_REG(hw, IXGBE_PSRTYPE(adapter->num_vfs + p),
···
 	/* Set capability flags */
 	rss = min_t(int, IXGBE_MAX_RSS_INDICES, num_online_cpus());
 	adapter->ring_feature[RING_F_RSS].limit = rss;
-	adapter->flags |= IXGBE_FLAG_RSS_ENABLED;
 	switch (hw->mac.type) {
 	case ixgbe_mac_82598EB:
 		if (hw->device_id == IXGBE_DEV_ID_82598AT)
···
 {
 	struct ixgbe_adapter *adapter = netdev_priv(netdev);
 
-	/* return error if RXHASH is being enabled when RSS is not supported */
-	if (!(adapter->flags & IXGBE_FLAG_RSS_ENABLED))
-		features &= ~NETIF_F_RXHASH;
-
 	/* If Rx checksum is disabled, then RSC/LRO should also be disabled */
 	if (!(features & NETIF_F_RXCSUM))
 		features &= ~NETIF_F_LRO;
···
 	if (!(features & NETIF_F_NTUPLE)) {
 		if (adapter->flags & IXGBE_FLAG_FDIR_PERFECT_CAPABLE) {
 			/* turn off Flow Director, set ATR and reset */
-			if ((adapter->flags & IXGBE_FLAG_RSS_ENABLED) &&
+			if (!(adapter->flags & IXGBE_FLAG_SRIOV_ENABLED) &&
 			    !(adapter->flags & IXGBE_FLAG_DCB_ENABLED))
 				adapter->flags |= IXGBE_FLAG_FDIR_HASH_CAPABLE;
 			need_reset = true;
···
 	err = ixgbe_init_interrupt_scheme(adapter);
 	if (err)
 		goto err_sw_init;
-
-	if (!(adapter->flags & IXGBE_FLAG_RSS_ENABLED)) {
-		netdev->hw_features &= ~NETIF_F_RXHASH;
-		netdev->features &= ~NETIF_F_RXHASH;
-	}
 
 	/* WOL not supported for all devices */
 	adapter->wol = 0;