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ixgbe: Add optional DCA infrastructure

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82598 cards and up support DCA, which enables the chipset to warm
up the caches for upcoming payload data. This code makes the
driver plug into the CONFIG_DCA infrastructure that was merged
earlier.

Signed-off-by: Jeb Cramer <cramerj@intel.com>
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Jeb Cramer 2008-03-03 15:04:02 -08:00 committed by Jeff Garzik
parent f494e8faa7
commit bd0362dde0
2 changed files with 157 additions and 0 deletions
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9
drivers/net/ixgbe/ixgbe.h
View file

@ -36,6 +36,9 @@
#include "ixgbe_type.h"
#include "ixgbe_common.h"
#ifdef CONFIG_DCA
#include <linux/dca.h>
#endif
#define IXGBE_ERR(args...) printk(KERN_ERR "ixgbe: " args)
@ -142,6 +145,11 @@ struct ixgbe_ring {
u16 reg_idx; /* holds the special value that gets the hardware register
* offset associated with this ring, which is different
* for DCE and RSS modes */
#ifdef CONFIG_DCA
/* cpu for tx queue */
int cpu;
#endif
struct ixgbe_queue_stats stats;
u8 v_idx; /* maps directly to the index for this ring in the hardware
* vector array, can also be used for finding the bit in EICR
@ -261,6 +269,7 @@ struct ixgbe_adapter {
#define IXGBE_FLAG_IMIR_ENABLED (u32)(1 << 5)
#define IXGBE_FLAG_RSS_ENABLED (u32)(1 << 6)
#define IXGBE_FLAG_VMDQ_ENABLED (u32)(1 << 7)
#define IXGBE_FLAG_DCA_ENABLED (u32)(1 << 8)
/* OS defined structs */
struct net_device *netdev;

148
drivers/net/ixgbe/ixgbe_main.c
View file

@ -80,6 +80,16 @@ static struct pci_device_id ixgbe_pci_tbl[] = {
};
MODULE_DEVICE_TABLE(pci, ixgbe_pci_tbl);
#ifdef CONFIG_DCA
static int ixgbe_notify_dca(struct notifier_block *, unsigned long event,
void *p);
static struct notifier_block dca_notifier = {
.notifier_call = ixgbe_notify_dca,
.next = NULL,
.priority = 0
};
#endif
MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
MODULE_DESCRIPTION("Intel(R) 10 Gigabit PCI Express Network Driver");
MODULE_LICENSE("GPL");
@ -290,6 +300,91 @@ static bool ixgbe_clean_tx_irq(struct ixgbe_adapter *adapter,
return cleaned;
}
#ifdef CONFIG_DCA
static void ixgbe_update_rx_dca(struct ixgbe_adapter *adapter,
struct ixgbe_ring *rxr)
{
u32 rxctrl;
int cpu = get_cpu();
int q = rxr - adapter->rx_ring;
if (rxr->cpu != cpu) {
rxctrl = IXGBE_READ_REG(&adapter->hw, IXGBE_DCA_RXCTRL(q));
rxctrl &= ~IXGBE_DCA_RXCTRL_CPUID_MASK;
rxctrl |= dca_get_tag(cpu);
rxctrl |= IXGBE_DCA_RXCTRL_DESC_DCA_EN;
rxctrl |= IXGBE_DCA_RXCTRL_HEAD_DCA_EN;
IXGBE_WRITE_REG(&adapter->hw, IXGBE_DCA_RXCTRL(q), rxctrl);
rxr->cpu = cpu;
}
put_cpu();
}
static void ixgbe_update_tx_dca(struct ixgbe_adapter *adapter,
struct ixgbe_ring *txr)
{
u32 txctrl;
int cpu = get_cpu();
int q = txr - adapter->tx_ring;
if (txr->cpu != cpu) {
txctrl = IXGBE_READ_REG(&adapter->hw, IXGBE_DCA_TXCTRL(q));
txctrl &= ~IXGBE_DCA_TXCTRL_CPUID_MASK;
txctrl |= dca_get_tag(cpu);
txctrl |= IXGBE_DCA_TXCTRL_DESC_DCA_EN;
IXGBE_WRITE_REG(&adapter->hw, IXGBE_DCA_TXCTRL(q), txctrl);
txr->cpu = cpu;
}
put_cpu();
}
static void ixgbe_setup_dca(struct ixgbe_adapter *adapter)
{
int i;
if (!(adapter->flags & IXGBE_FLAG_DCA_ENABLED))
return;
for (i = 0; i < adapter->num_tx_queues; i++) {
adapter->tx_ring[i].cpu = -1;
ixgbe_update_tx_dca(adapter, &adapter->tx_ring[i]);
}
for (i = 0; i < adapter->num_rx_queues; i++) {
adapter->rx_ring[i].cpu = -1;
ixgbe_update_rx_dca(adapter, &adapter->rx_ring[i]);
}
}
static int __ixgbe_notify_dca(struct device *dev, void *data)
{
struct net_device *netdev = dev_get_drvdata(dev);
struct ixgbe_adapter *adapter = netdev_priv(netdev);
unsigned long event = *(unsigned long *)data;
switch (event) {
case DCA_PROVIDER_ADD:
adapter->flags |= IXGBE_FLAG_DCA_ENABLED;
/* Always use CB2 mode, difference is masked
* in the CB driver. */
IXGBE_WRITE_REG(&adapter->hw, IXGBE_DCA_CTRL, 2);
if (dca_add_requester(dev) == IXGBE_SUCCESS) {
ixgbe_setup_dca(adapter);
break;
}
/* Fall Through since DCA is disabled. */
case DCA_PROVIDER_REMOVE:
if (adapter->flags & IXGBE_FLAG_DCA_ENABLED) {
dca_remove_requester(dev);
adapter->flags &= ~IXGBE_FLAG_DCA_ENABLED;
IXGBE_WRITE_REG(&adapter->hw, IXGBE_DCA_CTRL, 1);
}
break;
}
return IXGBE_SUCCESS;
}
#endif /* CONFIG_DCA */
/**
* ixgbe_receive_skb - Send a completed packet up the stack
* @adapter: board private structure
@ -811,6 +906,10 @@ static irqreturn_t ixgbe_msix_clean_tx(int irq, void *data)
r_idx = find_first_bit(q_vector->txr_idx, adapter->num_tx_queues);
for (i = 0; i < q_vector->txr_count; i++) {
txr = &(adapter->tx_ring[r_idx]);
#ifdef CONFIG_DCA
if (adapter->flags & IXGBE_FLAG_DCA_ENABLED)
ixgbe_update_tx_dca(adapter, txr);
#endif
txr->total_bytes = 0;
txr->total_packets = 0;
ixgbe_clean_tx_irq(adapter, txr);
@ -872,6 +971,10 @@ static int ixgbe_clean_rxonly(struct napi_struct *napi, int budget)
r_idx = find_first_bit(q_vector->rxr_idx, adapter->num_rx_queues);
rxr = &(adapter->rx_ring[r_idx]);
#ifdef CONFIG_DCA
if (adapter->flags & IXGBE_FLAG_DCA_ENABLED)
ixgbe_update_rx_dca(adapter, rxr);
#endif
ixgbe_clean_rx_irq(adapter, rxr, &work_done, budget);
@ -1924,6 +2027,13 @@ static int ixgbe_poll(struct napi_struct *napi, int budget)
struct ixgbe_adapter *adapter = q_vector->adapter;
int tx_cleaned = 0, work_done = 0;
#ifdef CONFIG_DCA
if (adapter->flags & IXGBE_FLAG_DCA_ENABLED) {
ixgbe_update_tx_dca(adapter, adapter->tx_ring);
ixgbe_update_rx_dca(adapter, adapter->rx_ring);
}
#endif
tx_cleaned = ixgbe_clean_tx_irq(adapter, adapter->tx_ring);
ixgbe_clean_rx_irq(adapter, adapter->rx_ring, &work_done, budget);
@ -3494,6 +3604,15 @@ static int __devinit ixgbe_probe(struct pci_dev *pdev,
if (err)
goto err_register;
#ifdef CONFIG_DCA
if (dca_add_requester(&pdev->dev) == IXGBE_SUCCESS) {
adapter->flags |= IXGBE_FLAG_DCA_ENABLED;
/* always use CB2 mode, difference is masked
* in the CB driver */
IXGBE_WRITE_REG(hw, IXGBE_DCA_CTRL, 2);
ixgbe_setup_dca(adapter);
}
#endif
dev_info(&pdev->dev, "Intel(R) 10 Gigabit Network Connection\n");
cards_found++;
@ -3535,6 +3654,14 @@ static void __devexit ixgbe_remove(struct pci_dev *pdev)
flush_scheduled_work();
#ifdef CONFIG_DCA
if (adapter->flags & IXGBE_FLAG_DCA_ENABLED) {
adapter->flags &= ~IXGBE_FLAG_DCA_ENABLED;
dca_remove_requester(&pdev->dev);
IXGBE_WRITE_REG(&adapter->hw, IXGBE_DCA_CTRL, 1);
}
#endif
unregister_netdev(netdev);
ixgbe_reset_interrupt_capability(adapter);
@ -3659,6 +3786,10 @@ static int __init ixgbe_init_module(void)
printk(KERN_INFO "%s: %s\n", ixgbe_driver_name, ixgbe_copyright);
#ifdef CONFIG_DCA
dca_register_notify(&dca_notifier);
#endif
ret = pci_register_driver(&ixgbe_driver);
return ret;
}
@ -3672,8 +3803,25 @@ module_init(ixgbe_init_module);
**/
static void __exit ixgbe_exit_module(void)
{
#ifdef CONFIG_DCA
dca_unregister_notify(&dca_notifier);
#endif
pci_unregister_driver(&ixgbe_driver);
}
#ifdef CONFIG_DCA
static int ixgbe_notify_dca(struct notifier_block *nb, unsigned long event,
void *p)
{
int ret_val;
ret_val = driver_for_each_device(&ixgbe_driver.driver, NULL, &event,
__ixgbe_notify_dca);
return ret_val ? NOTIFY_BAD : NOTIFY_DONE;
}
#endif /* CONFIG_DCA */
module_exit(ixgbe_exit_module);
/* ixgbe_main.c */