path: root/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c

/*******************************************************************************

  Intel 10 Gigabit PCI Express Linux driver
  Copyright(c) 1999 - 2012 Intel Corporation.

  This program is free software; you can redistribute it and/or modify it
  under the terms and conditions of the GNU General Public License,
  version 2, as published by the Free Software Foundation.

  This program is distributed in the hope it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  more details.

  You should have received a copy of the GNU General Public License along with
  this program; if not, write to the Free Software Foundation, Inc.,
  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

  The full GNU General Public License is included in this distribution in
  the file called "COPYING".

  Contact Information:
  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

*******************************************************************************/

#include "ixgbe.h"
#include "ixgbe_sriov.h"

/**
 * ixgbe_cache_ring_rss - Descriptor ring to register mapping for RSS
 * @adapter: board private structure to initialize
 *
 * Cache the descriptor ring offsets for RSS to the assigned rings.
 *
 **/
static inline bool ixgbe_cache_ring_rss(struct ixgbe_adapter *adapter)
{
	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++)
		adapter->tx_ring[i]->reg_idx = i;

	return true;
}
#ifdef CONFIG_IXGBE_DCB

/* ixgbe_get_first_reg_idx - Return first register index associated with ring */
static void ixgbe_get_first_reg_idx(struct ixgbe_adapter *adapter, u8 tc,
				    unsigned int *tx, unsigned int *rx)
{
	struct net_device *dev = adapter->netdev;
	struct ixgbe_hw *hw = &adapter->hw;
	u8 num_tcs = netdev_get_num_tc(dev);

	*tx = 0;
	*rx = 0;

	switch (hw->mac.type) {
	case ixgbe_mac_82598EB:
		*tx = tc << 2;
		*rx = tc << 3;
		break;
	case ixgbe_mac_82599EB:
	case ixgbe_mac_X540:
		if (num_tcs > 4) {
			if (tc < 3) {
				*tx = tc << 5;
				*rx = tc << 4;
			} else if (tc <  5) {
				*tx = ((tc + 2) << 4);
				*rx = tc << 4;
			} else if (tc < num_tcs) {
				*tx = ((tc + 8) << 3);
				*rx = tc << 4;
			}
		} else {
			*rx =  tc << 5;
			switch (tc) {
			case 0:
				*tx =  0;
				break;
			case 1:
				*tx = 64;
				break;
			case 2:
				*tx = 96;
				break;
			case 3:
				*tx = 112;
				break;
			default:
				break;
			}
		}
		break;
	default:
		break;
	}
}

/**
 * ixgbe_cache_ring_dcb - Descriptor ring to register mapping for DCB
 * @adapter: board private structure to initialize
 *
 * Cache the descriptor ring offsets for DCB to the assigned rings.
 *
 **/
static inline bool ixgbe_cache_ring_dcb(struct ixgbe_adapter *adapter)
{
	struct net_device *dev = adapter->netdev;
	int i, j, k;
	u8 num_tcs = netdev_get_num_tc(dev);

	if (!num_tcs)
		return false;

	for (i = 0, k = 0; i < num_tcs; i++) {
		unsigned int tx_s, rx_s;
		u16 count = dev->tc_to_txq[i].count;

		ixgbe_get_first_reg_idx(adapter, i, &tx_s, &rx_s);
		for (j = 0; j < count; j++, k++) {
			adapter->tx_ring[k]->reg_idx = tx_s + j;
			adapter->rx_ring[k]->reg_idx = rx_s + j;
			adapter->tx_ring[k]->dcb_tc = i;
			adapter->rx_ring[k]->dcb_tc = i;
		}
	}

	return true;
}
#endif

/**
 * ixgbe_cache_ring_fdir - Descriptor ring to register mapping for Flow Director
 * @adapter: board private structure to initialize
 *
 * Cache the descriptor ring offsets for Flow Director to the assigned rings.
 *
 **/
static inline bool ixgbe_cache_ring_fdir(struct ixgbe_adapter *adapter)
{
	int i;
	bool ret = false;

	if ((adapter->flags & IXGBE_FLAG_RSS_ENABLED) &&
	    (adapter->flags & IXGBE_FLAG_FDIR_HASH_CAPABLE)) {
		for (i = 0; i < adapter->num_rx_queues; i++)
			adapter->rx_ring[i]->reg_idx = i;
		for (i = 0; i < adapter->num_tx_queues;