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ixgb_main.c
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ixgb_main.c
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/*******************************************************************************
Copyright(c) 1999 - 2005 Intel Corporation. All rights reserved.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your option)
any later version.
This program is distributed in the hope that 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., 59
Temple Place - Suite 330, Boston, MA 02111-1307, USA.
The full GNU General Public License is included in this distribution in the
file called LICENSE.
Contact Information:
Linux NICS <[email protected]>
Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*******************************************************************************/
#include "ixgb.h"
/* Change Log
* 1.0.96 04/19/05
* - Make needlessly global code static -- [email protected]
* - ethtool cleanup -- [email protected]
* - Support for MODULE_VERSION -- [email protected]
* - add skb_header_cloned check to the tso path -- [email protected]
* 1.0.88 01/05/05
* - include fix to the condition that determines when to quit NAPI - Robert Olsson
* - use netif_poll_{disable/enable} to synchronize between NAPI and i/f up/down
* 1.0.84 10/26/04
* - reset buffer_info->dma in Tx resource cleanup logic
* 1.0.83 10/12/04
* - sparse cleanup - [email protected]
* - fix tx resource cleanup logic
*/
char ixgb_driver_name[] = "ixgb";
static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
#ifndef CONFIG_IXGB_NAPI
#define DRIVERNAPI
#else
#define DRIVERNAPI "-NAPI"
#endif
#define DRV_VERSION "1.0.100-k2"DRIVERNAPI
char ixgb_driver_version[] = DRV_VERSION;
static char ixgb_copyright[] = "Copyright (c) 1999-2005 Intel Corporation.";
/* ixgb_pci_tbl - PCI Device ID Table
*
* Wildcard entries (PCI_ANY_ID) should come last
* Last entry must be all 0s
*
* { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
* Class, Class Mask, private data (not used) }
*/
static struct pci_device_id ixgb_pci_tbl[] = {
{INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
{INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
{INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
/* required last entry */
{0,}
};
MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
/* Local Function Prototypes */
int ixgb_up(struct ixgb_adapter *adapter);
void ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog);
void ixgb_reset(struct ixgb_adapter *adapter);
int ixgb_setup_tx_resources(struct ixgb_adapter *adapter);
int ixgb_setup_rx_resources(struct ixgb_adapter *adapter);
void ixgb_free_tx_resources(struct ixgb_adapter *adapter);
void ixgb_free_rx_resources(struct ixgb_adapter *adapter);
void ixgb_update_stats(struct ixgb_adapter *adapter);
static int ixgb_init_module(void);
static void ixgb_exit_module(void);
static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
static void __devexit ixgb_remove(struct pci_dev *pdev);
static int ixgb_sw_init(struct ixgb_adapter *adapter);
static int ixgb_open(struct net_device *netdev);
static int ixgb_close(struct net_device *netdev);
static void ixgb_configure_tx(struct ixgb_adapter *adapter);
static void ixgb_configure_rx(struct ixgb_adapter *adapter);
static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
static void ixgb_set_multi(struct net_device *netdev);
static void ixgb_watchdog(unsigned long data);
static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
static int ixgb_set_mac(struct net_device *netdev, void *p);
static irqreturn_t ixgb_intr(int irq, void *data, struct pt_regs *regs);
static boolean_t ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
#ifdef CONFIG_IXGB_NAPI
static int ixgb_clean(struct net_device *netdev, int *budget);
static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter,
int *work_done, int work_to_do);
#else
static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter);
#endif
static void ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter);
void ixgb_set_ethtool_ops(struct net_device *netdev);
static void ixgb_tx_timeout(struct net_device *dev);
static void ixgb_tx_timeout_task(struct net_device *dev);
static void ixgb_vlan_rx_register(struct net_device *netdev,
struct vlan_group *grp);
static void ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid);
static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid);
static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
#ifdef CONFIG_NET_POLL_CONTROLLER
/* for netdump / net console */
static void ixgb_netpoll(struct net_device *dev);
#endif
/* Exported from other modules */
extern void ixgb_check_options(struct ixgb_adapter *adapter);
static struct pci_driver ixgb_driver = {
.name = ixgb_driver_name,
.id_table = ixgb_pci_tbl,
.probe = ixgb_probe,
.remove = __devexit_p(ixgb_remove),
};
MODULE_AUTHOR("Intel Corporation, <[email protected]>");
MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
/* some defines for controlling descriptor fetches in h/w */
#define RXDCTL_WTHRESH_DEFAULT 16 /* chip writes back at this many or RXT0 */
#define RXDCTL_PTHRESH_DEFAULT 0 /* chip considers prefech below
* this */
#define RXDCTL_HTHRESH_DEFAULT 0 /* chip will only prefetch if tail
* is pushed this many descriptors
* from head */
/**
* ixgb_init_module - Driver Registration Routine
*
* ixgb_init_module is the first routine called when the driver is
* loaded. All it does is register with the PCI subsystem.
**/
static int __init
ixgb_init_module(void)
{
printk(KERN_INFO "%s - version %s\n",
ixgb_driver_string, ixgb_driver_version);
printk(KERN_INFO "%s\n", ixgb_copyright);
return pci_module_init(&ixgb_driver);
}
module_init(ixgb_init_module);
/**
* ixgb_exit_module - Driver Exit Cleanup Routine
*
* ixgb_exit_module is called just before the driver is removed
* from memory.
**/
static void __exit
ixgb_exit_module(void)
{
pci_unregister_driver(&ixgb_driver);
}
module_exit(ixgb_exit_module);
/**
* ixgb_irq_disable - Mask off interrupt generation on the NIC
* @adapter: board private structure
**/
static inline void
ixgb_irq_disable(struct ixgb_adapter *adapter)
{
atomic_inc(&adapter->irq_sem);
IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
IXGB_WRITE_FLUSH(&adapter->hw);
synchronize_irq(adapter->pdev->irq);
}
/**
* ixgb_irq_enable - Enable default interrupt generation settings
* @adapter: board private structure
**/
static inline void
ixgb_irq_enable(struct ixgb_adapter *adapter)
{
if(atomic_dec_and_test(&adapter->irq_sem)) {
IXGB_WRITE_REG(&adapter->hw, IMS,
IXGB_INT_RXT0 | IXGB_INT_RXDMT0 | IXGB_INT_TXDW |
IXGB_INT_LSC);
IXGB_WRITE_FLUSH(&adapter->hw);
}
}
int
ixgb_up(struct ixgb_adapter *adapter)
{
struct net_device *netdev = adapter->netdev;
int err;
int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
struct ixgb_hw *hw = &adapter->hw;
/* hardware has been reset, we need to reload some things */
ixgb_set_multi(netdev);
ixgb_restore_vlan(adapter);
ixgb_configure_tx(adapter);
ixgb_setup_rctl(adapter);
ixgb_configure_rx(adapter);
ixgb_alloc_rx_buffers(adapter);
#ifdef CONFIG_PCI_MSI
{
boolean_t pcix = (IXGB_READ_REG(&adapter->hw, STATUS) &
IXGB_STATUS_PCIX_MODE) ? TRUE : FALSE;
adapter->have_msi = TRUE;
if (!pcix)
adapter->have_msi = FALSE;
else if((err = pci_enable_msi(adapter->pdev))) {
printk (KERN_ERR
"Unable to allocate MSI interrupt Error: %d\n", err);
adapter->have_msi = FALSE;
/* proceed to try to request regular interrupt */
}
}
#endif
if((err = request_irq(adapter->pdev->irq, &ixgb_intr,
SA_SHIRQ | SA_SAMPLE_RANDOM,
netdev->name, netdev)))
return err;
/* disable interrupts and get the hardware into a known state */
IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
if((hw->max_frame_size != max_frame) ||
(hw->max_frame_size !=
(IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
hw->max_frame_size = max_frame;
IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
if(hw->max_frame_size >
IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
uint32_t ctrl0 = IXGB_READ_REG(hw, CTRL0);
if(!(ctrl0 & IXGB_CTRL0_JFE)) {
ctrl0 |= IXGB_CTRL0_JFE;
IXGB_WRITE_REG(hw, CTRL0, ctrl0);
}
}
}
mod_timer(&adapter->watchdog_timer, jiffies);
ixgb_irq_enable(adapter);
#ifdef CONFIG_IXGB_NAPI
netif_poll_enable(netdev);
#endif
return 0;
}
void
ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog)
{
struct net_device *netdev = adapter->netdev;
ixgb_irq_disable(adapter);
free_irq(adapter->pdev->irq, netdev);
#ifdef CONFIG_PCI_MSI
if(adapter->have_msi == TRUE)
pci_disable_msi(adapter->pdev);
#endif
if(kill_watchdog)
del_timer_sync(&adapter->watchdog_timer);
#ifdef CONFIG_IXGB_NAPI
netif_poll_disable(netdev);
#endif
adapter->link_speed = 0;
adapter->link_duplex = 0;
netif_carrier_off(netdev);
netif_stop_queue(netdev);
ixgb_reset(adapter);
ixgb_clean_tx_ring(adapter);
ixgb_clean_rx_ring(adapter);
}
void
ixgb_reset(struct ixgb_adapter *adapter)
{
ixgb_adapter_stop(&adapter->hw);
if(!ixgb_init_hw(&adapter->hw))
IXGB_DBG("ixgb_init_hw failed.\n");
}
/**
* ixgb_probe - Device Initialization Routine
* @pdev: PCI device information struct
* @ent: entry in ixgb_pci_tbl
*
* Returns 0 on success, negative on failure
*
* ixgb_probe initializes an adapter identified by a pci_dev structure.
* The OS initialization, configuring of the adapter private structure,
* and a hardware reset occur.
**/
static int __devinit
ixgb_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
struct net_device *netdev = NULL;
struct ixgb_adapter *adapter;
static int cards_found = 0;
unsigned long mmio_start;
int mmio_len;
int pci_using_dac;
int i;
int err;
if((err = pci_enable_device(pdev)))
return err;
if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK))) {
pci_using_dac = 1;
} else {
if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK))) {
IXGB_ERR("No usable DMA configuration, aborting\n");
return err;
}
pci_using_dac = 0;
}
if((err = pci_request_regions(pdev, ixgb_driver_name)))
return err;
pci_set_master(pdev);
netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
if(!netdev) {
err = -ENOMEM;
goto err_alloc_etherdev;
}
SET_MODULE_OWNER(netdev);
SET_NETDEV_DEV(netdev, &pdev->dev);
pci_set_drvdata(pdev, netdev);
adapter = netdev_priv(netdev);
adapter->netdev = netdev;
adapter->pdev = pdev;
adapter->hw.back = adapter;
mmio_start = pci_resource_start(pdev, BAR_0);
mmio_len = pci_resource_len(pdev, BAR_0);
adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
if(!adapter->hw.hw_addr) {
err = -EIO;
goto err_ioremap;
}
for(i = BAR_1; i <= BAR_5; i++) {
if(pci_resource_len(pdev, i) == 0)
continue;
if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
adapter->hw.io_base = pci_resource_start(pdev, i);
break;
}
}
netdev->open = &ixgb_open;
netdev->stop = &ixgb_close;
netdev->hard_start_xmit = &ixgb_xmit_frame;
netdev->get_stats = &ixgb_get_stats;
netdev->set_multicast_list = &ixgb_set_multi;
netdev->set_mac_address = &ixgb_set_mac;
netdev->change_mtu = &ixgb_change_mtu;
ixgb_set_ethtool_ops(netdev);
netdev->tx_timeout = &ixgb_tx_timeout;
netdev->watchdog_timeo = HZ;
#ifdef CONFIG_IXGB_NAPI
netdev->poll = &ixgb_clean;
netdev->weight = 64;
#endif
netdev->vlan_rx_register = ixgb_vlan_rx_register;
netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
#ifdef CONFIG_NET_POLL_CONTROLLER
netdev->poll_controller = ixgb_netpoll;
#endif
netdev->mem_start = mmio_start;
netdev->mem_end = mmio_start + mmio_len;
netdev->base_addr = adapter->hw.io_base;
adapter->bd_number = cards_found;
adapter->link_speed = 0;
adapter->link_duplex = 0;
/* setup the private structure */
if((err = ixgb_sw_init(adapter)))
goto err_sw_init;
netdev->features = NETIF_F_SG |
NETIF_F_HW_CSUM |
NETIF_F_HW_VLAN_TX |
NETIF_F_HW_VLAN_RX |
NETIF_F_HW_VLAN_FILTER;
#ifdef NETIF_F_TSO
netdev->features |= NETIF_F_TSO;
#endif
if(pci_using_dac)
netdev->features |= NETIF_F_HIGHDMA;
/* make sure the EEPROM is good */
if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
printk(KERN_ERR "The EEPROM Checksum Is Not Valid\n");
err = -EIO;
goto err_eeprom;
}
ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
if(!is_valid_ether_addr(netdev->perm_addr)) {
err = -EIO;
goto err_eeprom;
}
adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
init_timer(&adapter->watchdog_timer);
adapter->watchdog_timer.function = &ixgb_watchdog;
adapter->watchdog_timer.data = (unsigned long)adapter;
INIT_WORK(&adapter->tx_timeout_task,
(void (*)(void *))ixgb_tx_timeout_task, netdev);
if((err = register_netdev(netdev)))
goto err_register;
/* we're going to reset, so assume we have no link for now */
netif_carrier_off(netdev);
netif_stop_queue(netdev);
printk(KERN_INFO "%s: Intel(R) PRO/10GbE Network Connection\n",
netdev->name);
ixgb_check_options(adapter);
/* reset the hardware with the new settings */
ixgb_reset(adapter);
cards_found++;
return 0;
err_register:
err_sw_init:
err_eeprom:
iounmap(adapter->hw.hw_addr);
err_ioremap:
free_netdev(netdev);
err_alloc_etherdev:
pci_release_regions(pdev);
return err;
}
/**
* ixgb_remove - Device Removal Routine
* @pdev: PCI device information struct
*
* ixgb_remove is called by the PCI subsystem to alert the driver
* that it should release a PCI device. The could be caused by a
* Hot-Plug event, or because the driver is going to be removed from
* memory.
**/
static void __devexit
ixgb_remove(struct pci_dev *pdev)
{
struct net_device *netdev = pci_get_drvdata(pdev);
struct ixgb_adapter *adapter = netdev_priv(netdev);
unregister_netdev(netdev);
iounmap(adapter->hw.hw_addr);
pci_release_regions(pdev);
free_netdev(netdev);
}
/**
* ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
* @adapter: board private structure to initialize
*
* ixgb_sw_init initializes the Adapter private data structure.
* Fields are initialized based on PCI device information and
* OS network device settings (MTU size).
**/
static int __devinit
ixgb_sw_init(struct ixgb_adapter *adapter)
{
struct ixgb_hw *hw = &adapter->hw;
struct net_device *netdev = adapter->netdev;
struct pci_dev *pdev = adapter->pdev;
/* PCI config space info */
hw->vendor_id = pdev->vendor;
hw->device_id = pdev->device;
hw->subsystem_vendor_id = pdev->subsystem_vendor;
hw->subsystem_id = pdev->subsystem_device;
adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
if((hw->device_id == IXGB_DEVICE_ID_82597EX)
||(hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
||(hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
hw->mac_type = ixgb_82597;
else {
/* should never have loaded on this device */
printk(KERN_ERR "ixgb: unsupported device id\n");
}
/* enable flow control to be programmed */
hw->fc.send_xon = 1;
atomic_set(&adapter->irq_sem, 1);
spin_lock_init(&adapter->tx_lock);
return 0;
}
/**
* ixgb_open - Called when a network interface is made active
* @netdev: network interface device structure
*
* Returns 0 on success, negative value on failure
*
* The open entry point is called when a network interface is made
* active by the system (IFF_UP). At this point all resources needed
* for transmit and receive operations are allocated, the interrupt
* handler is registered with the OS, the watchdog timer is started,
* and the stack is notified that the interface is ready.
**/
static int
ixgb_open(struct net_device *netdev)
{
struct ixgb_adapter *adapter = netdev_priv(netdev);
int err;
/* allocate transmit descriptors */
if((err = ixgb_setup_tx_resources(adapter)))
goto err_setup_tx;
/* allocate receive descriptors */
if((err = ixgb_setup_rx_resources(adapter)))
goto err_setup_rx;
if((err = ixgb_up(adapter)))
goto err_up;
return 0;
err_up:
ixgb_free_rx_resources(adapter);
err_setup_rx:
ixgb_free_tx_resources(adapter);
err_setup_tx:
ixgb_reset(adapter);
return err;
}
/**
* ixgb_close - Disables a network interface
* @netdev: network interface device structure
*
* Returns 0, this is not allowed to fail
*
* The close entry point is called when an interface is de-activated
* by the OS. The hardware is still under the drivers control, but
* needs to be disabled. A global MAC reset is issued to stop the
* hardware, and all transmit and receive resources are freed.
**/
static int
ixgb_close(struct net_device *netdev)
{
struct ixgb_adapter *adapter = netdev_priv(netdev);
ixgb_down(adapter, TRUE);
ixgb_free_tx_resources(adapter);
ixgb_free_rx_resources(adapter);
return 0;
}
/**
* ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
* @adapter: board private structure
*
* Return 0 on success, negative on failure
**/
int
ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
{
struct ixgb_desc_ring *txdr = &adapter->tx_ring;
struct pci_dev *pdev = adapter->pdev;
int size;
size = sizeof(struct ixgb_buffer) * txdr->count;
txdr->buffer_info = vmalloc(size);
if(!txdr->buffer_info) {
return -ENOMEM;
}
memset(txdr->buffer_info, 0, size);
/* round up to nearest 4K */
txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
IXGB_ROUNDUP(txdr->size, 4096);
txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
if(!txdr->desc) {
vfree(txdr->buffer_info);
return -ENOMEM;
}
memset(txdr->desc, 0, txdr->size);
txdr->next_to_use = 0;
txdr->next_to_clean = 0;
return 0;
}
/**
* ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
* @adapter: board private structure
*
* Configure the Tx unit of the MAC after a reset.
**/
static void
ixgb_configure_tx(struct ixgb_adapter *adapter)
{
uint64_t tdba = adapter->tx_ring.dma;
uint32_t tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
uint32_t tctl;
struct ixgb_hw *hw = &adapter->hw;
/* Setup the Base and Length of the Tx Descriptor Ring
* tx_ring.dma can be either a 32 or 64 bit value
*/
IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
IXGB_WRITE_REG(hw, TDLEN, tdlen);
/* Setup the HW Tx Head and Tail descriptor pointers */
IXGB_WRITE_REG(hw, TDH, 0);
IXGB_WRITE_REG(hw, TDT, 0);
/* don't set up txdctl, it induces performance problems if configured
* incorrectly */
/* Set the Tx Interrupt Delay register */
IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
/* Program the Transmit Control Register */
tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
IXGB_WRITE_REG(hw, TCTL, tctl);
/* Setup Transmit Descriptor Settings for this adapter */
adapter->tx_cmd_type =
IXGB_TX_DESC_TYPE
| (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
}
/**
* ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
* @adapter: board private structure
*
* Returns 0 on success, negative on failure
**/
int
ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
{
struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
struct pci_dev *pdev = adapter->pdev;
int size;
size = sizeof(struct ixgb_buffer) * rxdr->count;
rxdr->buffer_info = vmalloc(size);
if(!rxdr->buffer_info) {
return -ENOMEM;
}
memset(rxdr->buffer_info, 0, size);
/* Round up to nearest 4K */
rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
IXGB_ROUNDUP(rxdr->size, 4096);
rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
if(!rxdr->desc) {
vfree(rxdr->buffer_info);
return -ENOMEM;
}
memset(rxdr->desc, 0, rxdr->size);
rxdr->next_to_clean = 0;
rxdr->next_to_use = 0;
return 0;
}
/**
* ixgb_setup_rctl - configure the receive control register
* @adapter: Board private structure
**/
static void
ixgb_setup_rctl(struct ixgb_adapter *adapter)
{
uint32_t rctl;
rctl = IXGB_READ_REG(&adapter->hw, RCTL);
rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
rctl |=
IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
(adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
rctl |= IXGB_RCTL_SECRC;
switch (adapter->rx_buffer_len) {
case IXGB_RXBUFFER_2048:
default:
rctl |= IXGB_RCTL_BSIZE_2048;
break;
case IXGB_RXBUFFER_4096:
rctl |= IXGB_RCTL_BSIZE_4096;
break;
case IXGB_RXBUFFER_8192:
rctl |= IXGB_RCTL_BSIZE_8192;
break;
case IXGB_RXBUFFER_16384:
rctl |= IXGB_RCTL_BSIZE_16384;
break;
}
IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
}
/**
* ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
* @adapter: board private structure
*
* Configure the Rx unit of the MAC after a reset.
**/
static void
ixgb_configure_rx(struct ixgb_adapter *adapter)
{
uint64_t rdba = adapter->rx_ring.dma;
uint32_t rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
struct ixgb_hw *hw = &adapter->hw;
uint32_t rctl;
uint32_t rxcsum;
uint32_t rxdctl;
/* make sure receives are disabled while setting up the descriptors */
rctl = IXGB_READ_REG(hw, RCTL);
IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
/* set the Receive Delay Timer Register */
IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
/* Setup the Base and Length of the Rx Descriptor Ring */
IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
IXGB_WRITE_REG(hw, RDLEN, rdlen);
/* Setup the HW Rx Head and Tail Descriptor Pointers */
IXGB_WRITE_REG(hw, RDH, 0);
IXGB_WRITE_REG(hw, RDT, 0);
/* set up pre-fetching of receive buffers so we get some before we
* run out (default hardware behavior is to run out before fetching
* more). This sets up to fetch if HTHRESH rx descriptors are avail
* and the descriptors in hw cache are below PTHRESH. This avoids
* the hardware behavior of fetching <=512 descriptors in a single
* burst that pre-empts all other activity, usually causing fifo
* overflows. */
/* use WTHRESH to burst write 16 descriptors or burst when RXT0 */
rxdctl = RXDCTL_WTHRESH_DEFAULT << IXGB_RXDCTL_WTHRESH_SHIFT |
RXDCTL_HTHRESH_DEFAULT << IXGB_RXDCTL_HTHRESH_SHIFT |
RXDCTL_PTHRESH_DEFAULT << IXGB_RXDCTL_PTHRESH_SHIFT;
IXGB_WRITE_REG(hw, RXDCTL, rxdctl);
/* Enable Receive Checksum Offload for TCP and UDP */
if(adapter->rx_csum == TRUE) {
rxcsum = IXGB_READ_REG(hw, RXCSUM);
rxcsum |= IXGB_RXCSUM_TUOFL;
IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
}
/* Enable Receives */
IXGB_WRITE_REG(hw, RCTL, rctl);
}
/**
* ixgb_free_tx_resources - Free Tx Resources
* @adapter: board private structure
*
* Free all transmit software resources
**/
void
ixgb_free_tx_resources(struct ixgb_adapter *adapter)
{
struct pci_dev *pdev = adapter->pdev;
ixgb_clean_tx_ring(adapter);
vfree(adapter->tx_ring.buffer_info);
adapter->tx_ring.buffer_info = NULL;
pci_free_consistent(pdev, adapter->tx_ring.size,
adapter->tx_ring.desc, adapter->tx_ring.dma);
adapter->tx_ring.desc = NULL;
}
static inline void
ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
struct ixgb_buffer *buffer_info)
{
struct pci_dev *pdev = adapter->pdev;
if(buffer_info->dma) {
pci_unmap_page(pdev,
buffer_info->dma,
buffer_info->length,
PCI_DMA_TODEVICE);
buffer_info->dma = 0;
}
if(buffer_info->skb) {
dev_kfree_skb_any(buffer_info->skb);
buffer_info->skb = NULL;
}
}
/**
* ixgb_clean_tx_ring - Free Tx Buffers
* @adapter: board private structure
**/
static void
ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
{
struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
struct ixgb_buffer *buffer_info;
unsigned long size;
unsigned int i;
/* Free all the Tx ring sk_buffs */
for(i = 0; i < tx_ring->count; i++) {
buffer_info = &tx_ring->buffer_info[i];
ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
}
size = sizeof(struct ixgb_buffer) * tx_ring->count;
memset(tx_ring->buffer_info, 0, size);
/* Zero out the descriptor ring */
memset(tx_ring->desc, 0, tx_ring->size);
tx_ring->next_to_use = 0;
tx_ring->next_to_clean = 0;
IXGB_WRITE_REG(&adapter->hw, TDH, 0);
IXGB_WRITE_REG(&adapter->hw, TDT, 0);
}
/**
* ixgb_free_rx_resources - Free Rx Resources
* @adapter: board private structure
*
* Free all receive software resources
**/
void
ixgb_free_rx_resources(struct ixgb_adapter *adapter)
{
struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
struct pci_dev *pdev = adapter->pdev;
ixgb_clean_rx_ring(adapter);
vfree(rx_ring->buffer_info);
rx_ring->buffer_info = NULL;
pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
rx_ring->desc = NULL;
}
/**
* ixgb_clean_rx_ring - Free Rx Buffers
* @adapter: board private structure
**/
static void
ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
{
struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
struct ixgb_buffer *buffer_info;
struct pci_dev *pdev = adapter->pdev;
unsigned long size;
unsigned int i;
/* Free all the Rx ring sk_buffs */
for(i = 0; i < rx_ring->count; i++) {
buffer_info = &rx_ring->buffer_info[i];
if(buffer_info->skb) {
pci_unmap_single(pdev,
buffer_info->dma,
buffer_info->length,
PCI_DMA_FROMDEVICE);
dev_kfree_skb(buffer_info->skb);
buffer_info->skb = NULL;
}
}